The Tor Browser: comparison layout/base/nsPresShell.cpp

--1:000000000000
+:224ce793312a
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+* vim: set ts=2 sw=2 et tw=78:
+* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* This Original Code has been modified by IBM Corporation.
+* Modifications made by IBM described herein are
+* Copyright (c) International Business Machines
+* Corporation, 2000
+*
+* Modifications to Mozilla code or documentation
+* identified per MPL Section 3.3
+*
+* Date         Modified by     Description of modification
+* 05/03/2000   IBM Corp.       Observer events for reflow states
+*/
+/* a presentation of a document, part 2 */
+#ifdef MOZ_LOGGING
+#define FORCE_PR_LOG /* Allow logging in the release build */
+#endif
+#include "prlog.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStateManager.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/IMEStateManager.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/dom/TabChild.h"
+#include "mozilla/Likely.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/TextEvents.h"
+#include "mozilla/TouchEvents.h"
+#include <algorithm>
+#ifdef XP_WIN
+#include "winuser.h"
+#endif
+#include "nsPresShell.h"
+#include "nsPresContext.h"
+#include "nsIContent.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/Event.h" // for Event::GetEventPopupControlState()
+#include "mozilla/dom/ShadowRoot.h"
+#include "mozilla/dom/PointerEvent.h"
+#include "nsIDocument.h"
+#include "nsCSSStyleSheet.h"
+#include "nsAnimationManager.h"
+#include "nsNameSpaceManager.h"  // for Pref-related rule management (bugs 22963,20760,31816)
+#include "nsFrame.h"
+#include "FrameLayerBuilder.h"
+#include "nsViewManager.h"
+#include "nsView.h"
+#include "nsCRTGlue.h"
+#include "prprf.h"
+#include "prinrval.h"
+#include "nsTArray.h"
+#include "nsCOMArray.h"
+#include "nsContainerFrame.h"
+#include "nsISelection.h"
+#include "mozilla/dom/Selection.h"
+#include "nsGkAtoms.h"
+#include "nsIDOMRange.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMNode.h"
+#include "nsIDOMNodeList.h"
+#include "nsIDOMElement.h"
+#include "nsRange.h"
+#include "nsCOMPtr.h"
+#include "nsAutoPtr.h"
+#include "nsReadableUtils.h"
+#include "nsIPageSequenceFrame.h"
+#include "nsCaret.h"
+#include "nsIDOMHTMLDocument.h"
+#include "nsFrameManager.h"
+#include "nsXPCOM.h"
+#include "nsILayoutHistoryState.h"
+#include "nsILineIterator.h" // for ScrollContentIntoView
+#include "pldhash.h"
+#include "mozilla/dom/Touch.h"
+#include "mozilla/dom/PointerEventBinding.h"
+#include "nsIObserverService.h"
+#include "nsDocShell.h"        // for reflow observation
+#include "nsIBaseWindow.h"
+#include "nsError.h"
+#include "nsLayoutUtils.h"
+#include "nsViewportInfo.h"
+#include "nsCSSRendering.h"
+// for |#ifdef DEBUG| code
+#include "prenv.h"
+#include "nsDisplayList.h"
+#include "nsRegion.h"
+#include "nsRenderingContext.h"
+#include "nsAutoLayoutPhase.h"
+#ifdef MOZ_REFLOW_PERF
+#include "nsFontMetrics.h"
+#endif
+#include "PositionedEventTargeting.h"
+#include "nsIReflowCallback.h"
+#include "nsPIDOMWindow.h"
+#include "nsFocusManager.h"
+#include "nsIObjectFrame.h"
+#include "nsIObjectLoadingContent.h"
+#include "nsNetUtil.h"
+#include "nsThreadUtils.h"
+#include "nsStyleSheetService.h"
+#include "gfxImageSurface.h"
+#include "gfxContext.h"
+#include "nsSMILAnimationController.h"
+#include "SVGContentUtils.h"
+#include "nsSVGEffects.h"
+#include "SVGFragmentIdentifier.h"
+#include "nsArenaMemoryStats.h"
+#include "nsPerformance.h"
+#include "nsRefreshDriver.h"
+#include "nsDOMNavigationTiming.h"
+// Drag & Drop, Clipboard
+#include "nsIDocShellTreeItem.h"
+#include "nsIURI.h"
+#include "nsIScrollableFrame.h"
+#include "nsITimer.h"
+#ifdef ACCESSIBILITY
+#include "nsAccessibilityService.h"
+#include "mozilla/a11y/DocAccessible.h"
+#ifdef DEBUG
+#include "mozilla/a11y/Logging.h"
+#endif
+#endif
+// For style data reconstruction
+#include "nsStyleChangeList.h"
+#include "nsCSSFrameConstructor.h"
+#ifdef MOZ_XUL
+#include "nsMenuFrame.h"
+#include "nsTreeBodyFrame.h"
+#include "nsIBoxObject.h"
+#include "nsITreeBoxObject.h"
+#include "nsMenuPopupFrame.h"
+#include "nsITreeColumns.h"
+#include "nsIDOMXULMultSelectCntrlEl.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIDOMXULMenuListElement.h"
+#endif
+#include "GeckoProfiler.h"
+#include "gfxPlatform.h"
+#include "Layers.h"
+#include "LayerTreeInvalidation.h"
+#include "mozilla/css/ImageLoader.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/Telemetry.h"
+#include "nsCanvasFrame.h"
+#include "nsIImageLoadingContent.h"
+#include "nsIScreen.h"
+#include "nsIScreenManager.h"
+#include "nsPlaceholderFrame.h"
+#include "nsTransitionManager.h"
+#include "ChildIterator.h"
+#include "RestyleManager.h"
+#include "nsIDOMHTMLElement.h"
+#include "nsIDragSession.h"
+#include "nsIFrameInlines.h"
+#include "mozilla/gfx/2D.h"
+#ifdef ANDROID
+#include "nsIDocShellTreeOwner.h"
+#endif
+#ifdef MOZ_TASK_TRACER
+#include "GeckoTaskTracer.h"
+using namespace mozilla::tasktracer;
+#endif
+#define ANCHOR_SCROLL_FLAGS \
+(nsIPresShell::SCROLL_OVERFLOW_HIDDEN | nsIPresShell::SCROLL_NO_PARENT_FRAMES)
+using namespace mozilla;
+using namespace mozilla::css;
+using namespace mozilla::dom;
+using namespace mozilla::gfx;
+using namespace mozilla::layers;
+using namespace mozilla::gfx;
+CapturingContentInfo nsIPresShell::gCaptureInfo =
+{ false /* mAllowed */, false /* mPointerLock */, false /* mRetargetToElement */,
+false /* mPreventDrag */, nullptr /* mContent */ };
+nsIContent* nsIPresShell::gKeyDownTarget;
+nsRefPtrHashtable<nsUint32HashKey, dom::Touch>* nsIPresShell::gCaptureTouchList;
+nsRefPtrHashtable<nsUint32HashKey, nsIContent>* nsIPresShell::gPointerCaptureList;
+nsClassHashtable<nsUint32HashKey, nsIPresShell::PointerInfo>* nsIPresShell::gActivePointersIds;
+bool nsIPresShell::gPreventMouseEvents = false;
+// convert a color value to a string, in the CSS format #RRGGBB
+// *  - initially created for bugs 31816, 20760, 22963
+static void ColorToString(nscolor aColor, nsAutoString &aString);
+// RangePaintInfo is used to paint ranges to offscreen buffers
+struct RangePaintInfo {
+nsRefPtr<nsRange> mRange;
+nsDisplayListBuilder mBuilder;
+nsDisplayList mList;
+// offset of builder's reference frame to the root frame
+nsPoint mRootOffset;
+RangePaintInfo(nsRange* aRange, nsIFrame* aFrame)
+: mRange(aRange), mBuilder(aFrame, nsDisplayListBuilder::PAINTING, false)
+{
+MOZ_COUNT_CTOR(RangePaintInfo);
+}
+~RangePaintInfo()
+{
+mList.DeleteAll();
+MOZ_COUNT_DTOR(RangePaintInfo);
+}
+};
+#undef NOISY
+// ----------------------------------------------------------------------
+#ifdef DEBUG
+// Set the environment variable GECKO_VERIFY_REFLOW_FLAGS to one or
+// more of the following flags (comma separated) for handy debug
+// output.
+static uint32_t gVerifyReflowFlags;
+struct VerifyReflowFlags {
+const char*    name;
+uint32_t bit;
+};
+static const VerifyReflowFlags gFlags[] = {
+{ "verify",                VERIFY_REFLOW_ON },
+{ "reflow",                VERIFY_REFLOW_NOISY },
+{ "all",                   VERIFY_REFLOW_ALL },
+{ "list-commands",         VERIFY_REFLOW_DUMP_COMMANDS },
+{ "noisy-commands",        VERIFY_REFLOW_NOISY_RC },
+{ "really-noisy-commands", VERIFY_REFLOW_REALLY_NOISY_RC },
+{ "resize",                VERIFY_REFLOW_DURING_RESIZE_REFLOW },
+};
+#define NUM_VERIFY_REFLOW_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
+static void
+ShowVerifyReflowFlags()
+{
+printf("Here are the available GECKO_VERIFY_REFLOW_FLAGS:\n");
+const VerifyReflowFlags* flag = gFlags;
+const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
+while (flag < limit) {
+printf("  %s\n", flag->name);
+++flag;
+}
+printf("Note: GECKO_VERIFY_REFLOW_FLAGS is a comma separated list of flag\n");
+printf("names (no whitespace)\n");
+}
+#endif
+//========================================================================
+//========================================================================
+//========================================================================
+#ifdef MOZ_REFLOW_PERF
+class ReflowCountMgr;
+static const char kGrandTotalsStr[] = "Grand Totals";
+// Counting Class
+class ReflowCounter {
+public:
+ReflowCounter(ReflowCountMgr * aMgr = nullptr);
+~ReflowCounter();
+void ClearTotals();
+void DisplayTotals(const char * aStr);
+void DisplayDiffTotals(const char * aStr);
+void DisplayHTMLTotals(const char * aStr);
+void Add()                { mTotal++;         }
+void Add(uint32_t aTotal) { mTotal += aTotal; }
+void CalcDiffInTotals();
+void SetTotalsCache();
+void SetMgr(ReflowCountMgr * aMgr) { mMgr = aMgr; }
+uint32_t GetTotal() { return mTotal; }
+protected:
+void DisplayTotals(uint32_t aTotal, const char * aTitle);
+void DisplayHTMLTotals(uint32_t aTotal, const char * aTitle);
+uint32_t mTotal;
+uint32_t mCacheTotal;
+ReflowCountMgr * mMgr; // weak reference (don't delete)
+};
+// Counting Class
+class IndiReflowCounter {
+public:
+IndiReflowCounter(ReflowCountMgr * aMgr = nullptr)
+: mFrame(nullptr),
+mCount(0),
+mMgr(aMgr),
+mCounter(aMgr),
+mHasBeenOutput(false)
+{}
+virtual ~IndiReflowCounter() {}
+nsAutoString mName;
+nsIFrame *   mFrame;   // weak reference (don't delete)
+int32_t      mCount;
+ReflowCountMgr * mMgr; // weak reference (don't delete)
+ReflowCounter mCounter;
+bool          mHasBeenOutput;
+};
+//--------------------
+// Manager Class
+//--------------------
+class ReflowCountMgr {
+public:
+ReflowCountMgr();
+virtual ~ReflowCountMgr();
+void ClearTotals();
+void ClearGrandTotals();
+void DisplayTotals(const char * aStr);
+void DisplayHTMLTotals(const char * aStr);
+void DisplayDiffsInTotals(const char * aStr);
+void Add(const char * aName, nsIFrame * aFrame);
+ReflowCounter * LookUp(const char * aName);
+void PaintCount(const char *aName, nsRenderingContext* aRenderingContext,
+nsPresContext *aPresContext, nsIFrame *aFrame,
+const nsPoint &aOffset, uint32_t aColor);
+FILE * GetOutFile() { return mFD; }
+PLHashTable * GetIndiFrameHT() { return mIndiFrameCounts; }
+void SetPresContext(nsPresContext * aPresContext) { mPresContext = aPresContext; } // weak reference
+void SetPresShell(nsIPresShell* aPresShell) { mPresShell= aPresShell; } // weak reference
+void SetDumpFrameCounts(bool aVal)         { mDumpFrameCounts = aVal; }
+void SetDumpFrameByFrameCounts(bool aVal)  { mDumpFrameByFrameCounts = aVal; }
+void SetPaintFrameCounts(bool aVal)        { mPaintFrameByFrameCounts = aVal; }
+bool IsPaintingFrameCounts() { return mPaintFrameByFrameCounts; }
+protected:
+void DisplayTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
+void DisplayHTMLTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
+static int RemoveItems(PLHashEntry *he, int i, void *arg);
+static int RemoveIndiItems(PLHashEntry *he, int i, void *arg);
+void CleanUp();
+// stdout Output Methods
+static int DoSingleTotal(PLHashEntry *he, int i, void *arg);
+static int DoSingleIndi(PLHashEntry *he, int i, void *arg);
+void DoGrandTotals();
+void DoIndiTotalsTree();
+// HTML Output Methods
+static int DoSingleHTMLTotal(PLHashEntry *he, int i, void *arg);
+void DoGrandHTMLTotals();
+// Zero Out the Totals
+static int DoClearTotals(PLHashEntry *he, int i, void *arg);
+// Displays the Diff Totals
+static int DoDisplayDiffTotals(PLHashEntry *he, int i, void *arg);
+PLHashTable * mCounts;
+PLHashTable * mIndiFrameCounts;
+FILE * mFD;
+bool mDumpFrameCounts;
+bool mDumpFrameByFrameCounts;
+bool mPaintFrameByFrameCounts;
+bool mCycledOnce;
+// Root Frame for Individual Tracking
+nsPresContext * mPresContext;
+nsIPresShell*    mPresShell;
+// ReflowCountMgr gReflowCountMgr;
+};
+#endif
+//========================================================================
+// comment out to hide caret
+#define SHOW_CARET
+// The upper bound on the amount of time to spend reflowing, in
+// microseconds.  When this bound is exceeded and reflow commands are
+// still queued up, a reflow event is posted.  The idea is for reflow
+// to not hog the processor beyond the time specifed in
+// gMaxRCProcessingTime.  This data member is initialized from the
+// layout.reflow.timeslice pref.
+#define NS_MAX_REFLOW_TIME    1000000
+static int32_t gMaxRCProcessingTime = -1;
+struct nsCallbackEventRequest
+{
+nsIReflowCallback* callback;
+nsCallbackEventRequest* next;
+};
+// ----------------------------------------------------------------------------
+#define ASSERT_REFLOW_SCHEDULED_STATE()                                       \
+NS_ASSERTION(mReflowScheduled ==                                            \
+GetPresContext()->RefreshDriver()->                          \
+IsLayoutFlushObserver(this), "Unexpected state")
+class nsAutoCauseReflowNotifier
+{
+public:
+nsAutoCauseReflowNotifier(PresShell* aShell)
+: mShell(aShell)
+{
+mShell->WillCauseReflow();
+}
+~nsAutoCauseReflowNotifier()
+{
+// This check should not be needed. Currently the only place that seem
+// to need it is the code that deals with bug 337586.
+if (!mShell->mHaveShutDown) {
+mShell->DidCauseReflow();
+}
+else {
+nsContentUtils::RemoveScriptBlocker();
+}
+}
+PresShell* mShell;
+};
+class MOZ_STACK_CLASS nsPresShellEventCB : public EventDispatchingCallback
+{
+public:
+nsPresShellEventCB(PresShell* aPresShell) : mPresShell(aPresShell) {}
+virtual void HandleEvent(EventChainPostVisitor& aVisitor) MOZ_OVERRIDE
+{
+if (aVisitor.mPresContext && aVisitor.mEvent->eventStructType != NS_EVENT) {
+if (aVisitor.mEvent->message == NS_MOUSE_BUTTON_DOWN ||
+aVisitor.mEvent->message == NS_MOUSE_BUTTON_UP) {
+// Mouse-up and mouse-down events call nsFrame::HandlePress/Release
+// which call GetContentOffsetsFromPoint which requires up-to-date layout.
+// Bring layout up-to-date now so that GetCurrentEventFrame() below
+// will return a real frame and we don't have to worry about
+// destroying it by flushing later.
+mPresShell->FlushPendingNotifications(Flush_Layout);
+} else if (aVisitor.mEvent->message == NS_WHEEL_WHEEL &&
+aVisitor.mEventStatus != nsEventStatus_eConsumeNoDefault) {
+nsIFrame* frame = mPresShell->GetCurrentEventFrame();
+if (frame) {
+// chrome (including addons) should be able to know if content
+// handles both D3E "wheel" event and legacy mouse scroll events.
+// We should dispatch legacy mouse events before dispatching the
+// "wheel" event into system group.
+nsRefPtr<EventStateManager> esm =
+aVisitor.mPresContext->EventStateManager();
+esm->DispatchLegacyMouseScrollEvents(frame,
+aVisitor.mEvent->AsWheelEvent(),
+&aVisitor.mEventStatus);
+}
+}
+nsIFrame* frame = mPresShell->GetCurrentEventFrame();
+if (!frame &&
+(aVisitor.mEvent->message == NS_MOUSE_BUTTON_UP ||
+aVisitor.mEvent->message == NS_TOUCH_END)) {
+// Redirect BUTTON_UP and TOUCH_END events to the root frame to ensure
+// that capturing is released.
+frame = mPresShell->GetRootFrame();
+}
+if (frame) {
+frame->HandleEvent(aVisitor.mPresContext,
+aVisitor.mEvent->AsGUIEvent(),
+&aVisitor.mEventStatus);
+}
+}
+}
+nsRefPtr<PresShell> mPresShell;
+};
+class nsBeforeFirstPaintDispatcher : public nsRunnable
+{
+public:
+nsBeforeFirstPaintDispatcher(nsIDocument* aDocument)
+: mDocument(aDocument) {}
+// Fires the "before-first-paint" event so that interested parties (right now, the
+// mobile browser) are aware of it.
+NS_IMETHOD Run() MOZ_OVERRIDE
+{
+nsCOMPtr<nsIObserverService> observerService =
+mozilla::services::GetObserverService();
+if (observerService) {
+observerService->NotifyObservers(mDocument, "before-first-paint",
+nullptr);
+}
+return NS_OK;
+}
+private:
+nsCOMPtr<nsIDocument> mDocument;
+};
+bool PresShell::sDisableNonTestMouseEvents = false;
+#ifdef PR_LOGGING
+PRLogModuleInfo* PresShell::gLog;
+#endif
+#ifdef DEBUG
+static void
+VerifyStyleTree(nsPresContext* aPresContext, nsFrameManager* aFrameManager)
+{
+if (nsFrame::GetVerifyStyleTreeEnable()) {
+nsIFrame* rootFrame = aFrameManager->GetRootFrame();
+aPresContext->RestyleManager()->DebugVerifyStyleTree(rootFrame);
+}
+}
+#define VERIFY_STYLE_TREE ::VerifyStyleTree(mPresContext, mFrameConstructor)
+#else
+#define VERIFY_STYLE_TREE
+#endif
+static bool gVerifyReflowEnabled;
+bool
+nsIPresShell::GetVerifyReflowEnable()
+{
+#ifdef DEBUG
+static bool firstTime = true;
+if (firstTime) {
+firstTime = false;
+char* flags = PR_GetEnv("GECKO_VERIFY_REFLOW_FLAGS");
+if (flags) {
+bool error = false;
+for (;;) {
+char* comma = PL_strchr(flags, ',');
+if (comma)
+*comma = '\0';
+bool found = false;
+const VerifyReflowFlags* flag = gFlags;
+const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
+while (flag < limit) {
+if (PL_strcasecmp(flag->name, flags) == 0) {
+gVerifyReflowFlags |= flag->bit;
+found = true;
+break;
+}
+++flag;
+}
+if (! found)
+error = true;
+if (! comma)
+break;
+*comma = ',';
+flags = comma + 1;
+}
+if (error)
+ShowVerifyReflowFlags();
+}
+if (VERIFY_REFLOW_ON & gVerifyReflowFlags) {
+gVerifyReflowEnabled = true;
+printf("Note: verifyreflow is enabled");
+if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
+printf(" (noisy)");
+}
+if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
+printf(" (all)");
+}
+if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
+printf(" (show reflow commands)");
+}
+if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
+printf(" (noisy reflow commands)");
+if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
+printf(" (REALLY noisy reflow commands)");
+}
+}
+printf("\n");
+}
+}
+#endif
+return gVerifyReflowEnabled;
+}
+void
+PresShell::AddInvalidateHiddenPresShellObserver(nsRefreshDriver *aDriver)
+{
+if (!mHiddenInvalidationObserverRefreshDriver && !mIsDestroying && !mHaveShutDown) {
+aDriver->AddPresShellToInvalidateIfHidden(this);
+mHiddenInvalidationObserverRefreshDriver = aDriver;
+}
+}
+void
+nsIPresShell::InvalidatePresShellIfHidden()
+{
+if (!IsVisible() && mPresContext) {
+mPresContext->NotifyInvalidation(0);
+}
+mHiddenInvalidationObserverRefreshDriver = nullptr;
+}
+void
+nsIPresShell::CancelInvalidatePresShellIfHidden()
+{
+if (mHiddenInvalidationObserverRefreshDriver) {
+mHiddenInvalidationObserverRefreshDriver->RemovePresShellToInvalidateIfHidden(this);
+mHiddenInvalidationObserverRefreshDriver = nullptr;
+}
+}
+void
+nsIPresShell::SetVerifyReflowEnable(bool aEnabled)
+{
+gVerifyReflowEnabled = aEnabled;
+}
+/* virtual */ void
+nsIPresShell::AddWeakFrameExternal(nsWeakFrame* aWeakFrame)
+{
+AddWeakFrameInternal(aWeakFrame);
+}
+void
+nsIPresShell::AddWeakFrameInternal(nsWeakFrame* aWeakFrame)
+{
+if (aWeakFrame->GetFrame()) {
+aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
+}
+aWeakFrame->SetPreviousWeakFrame(mWeakFrames);
+mWeakFrames = aWeakFrame;
+}
+/* virtual */ void
+nsIPresShell::RemoveWeakFrameExternal(nsWeakFrame* aWeakFrame)
+{
+RemoveWeakFrameInternal(aWeakFrame);
+}
+void
+nsIPresShell::RemoveWeakFrameInternal(nsWeakFrame* aWeakFrame)
+{
+if (mWeakFrames == aWeakFrame) {
+mWeakFrames = aWeakFrame->GetPreviousWeakFrame();
+return;
+}
+nsWeakFrame* nextWeak = mWeakFrames;
+while (nextWeak && nextWeak->GetPreviousWeakFrame() != aWeakFrame) {
+nextWeak = nextWeak->GetPreviousWeakFrame();
+}
+if (nextWeak) {
+nextWeak->SetPreviousWeakFrame(aWeakFrame->GetPreviousWeakFrame());
+}
+}
+already_AddRefed<nsFrameSelection>
+nsIPresShell::FrameSelection()
+{
+nsRefPtr<nsFrameSelection> ret = mSelection;
+return ret.forget();
+}
+//----------------------------------------------------------------------
+static bool sSynthMouseMove = true;
+static uint32_t sNextPresShellId;
+static bool sPointerEventEnabled = true;
+PresShell::PresShell()
+: mMouseLocation(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)
+{
+mSelection = nullptr;
+#ifdef MOZ_REFLOW_PERF
+mReflowCountMgr = new ReflowCountMgr();
+mReflowCountMgr->SetPresContext(mPresContext);
+mReflowCountMgr->SetPresShell(this);
+#endif
+#ifdef PR_LOGGING
+mLoadBegin = TimeStamp::Now();
+if (!gLog) {
+gLog = PR_NewLogModule("PresShell");
+}
+#endif
+mSelectionFlags = nsISelectionDisplay::DISPLAY_TEXT | nsISelectionDisplay::DISPLAY_IMAGES;
+mIsThemeSupportDisabled = false;
+mIsActive = true;
+// FIXME/bug 735029: find a better solution to this problem
+#ifdef MOZ_ANDROID_OMTC
+// The java pan/zoom code uses this to mean approximately "request a
+// reset of pan/zoom state" which doesn't necessarily correspond
+// with the first paint of content.
+mIsFirstPaint = false;
+#else
+mIsFirstPaint = true;
+#endif
+mPresShellId = sNextPresShellId++;
+mFrozen = false;
+#ifdef DEBUG
+mPresArenaAllocCount = 0;
+#endif
+mRenderFlags = 0;
+mXResolution = 1.0;
+mYResolution = 1.0;
+mViewportOverridden = false;
+mScrollPositionClampingScrollPortSizeSet = false;
+mMaxLineBoxWidth = 0;
+static bool addedSynthMouseMove = false;
+if (!addedSynthMouseMove) {
+Preferences::AddBoolVarCache(&sSynthMouseMove,
+"layout.reflow.synthMouseMove", true);
+addedSynthMouseMove = true;
+}
+static bool addedPointerEventEnabled = false;
+if (!addedPointerEventEnabled) {
+Preferences::AddBoolVarCache(&sPointerEventEnabled,
+"dom.w3c_pointer_events.enabled", true);
+addedPointerEventEnabled = true;
+}
+mPaintingIsFrozen = false;
+}
+NS_IMPL_ISUPPORTS(PresShell, nsIPresShell, nsIDocumentObserver,
+nsISelectionController,
+nsISelectionDisplay, nsIObserver, nsISupportsWeakReference,
+nsIMutationObserver)
+PresShell::~PresShell()
+{
+if (!mHaveShutDown) {
+NS_NOTREACHED("Someone did not call nsIPresShell::destroy");
+Destroy();
+}
+NS_ASSERTION(mCurrentEventContentStack.Count() == 0,
+"Huh, event content left on the stack in pres shell dtor!");
+NS_ASSERTION(mFirstCallbackEventRequest == nullptr &&
+mLastCallbackEventRequest == nullptr,
+"post-reflow queues not empty.  This means we're leaking");
+// Verify that if painting was frozen, but we're being removed from the tree,
+// that we now re-enable painting on our refresh driver, since it may need to
+// be re-used by another presentation.
+if (mPaintingIsFrozen) {
+mPresContext->RefreshDriver()->Thaw();
+}
+#ifdef DEBUG
+MOZ_ASSERT(mPresArenaAllocCount == 0,
+"Some pres arena objects were not freed");
+#endif
+delete mStyleSet;
+delete mFrameConstructor;
+mCurrentEventContent = nullptr;
+NS_IF_RELEASE(mPresContext);
+NS_IF_RELEASE(mDocument);
+NS_IF_RELEASE(mSelection);
+}
+/**
+* Initialize the presentation shell. Create view manager and style
+* manager.
+* Note this can't be merged into our constructor because caret initialization
+* calls AddRef() on us.
+*/
+void
+PresShell::Init(nsIDocument* aDocument,
+nsPresContext* aPresContext,
+nsViewManager* aViewManager,
+nsStyleSet* aStyleSet,
+nsCompatibility aCompatMode)
+{
+NS_PRECONDITION(aDocument, "null ptr");
+NS_PRECONDITION(aPresContext, "null ptr");
+NS_PRECONDITION(aViewManager, "null ptr");
+NS_PRECONDITION(!mDocument, "already initialized");
+if (!aDocument || !aPresContext || !aViewManager || mDocument) {
+return;
+}
+mDocument = aDocument;
+NS_ADDREF(mDocument);
+mViewManager = aViewManager;
+// Create our frame constructor.
+mFrameConstructor = new nsCSSFrameConstructor(mDocument, this, aStyleSet);
+mFrameManager = mFrameConstructor;
+// The document viewer owns both view manager and pres shell.
+mViewManager->SetPresShell(this);
+// Bind the context to the presentation shell.
+mPresContext = aPresContext;
+NS_ADDREF(mPresContext);
+aPresContext->SetShell(this);
+// Now we can initialize the style set.
+aStyleSet->Init(aPresContext);
+mStyleSet = aStyleSet;
+// Notify our prescontext that it now has a compatibility mode.  Note that
+// this MUST happen after we set up our style set but before we create any
+// frames.
+mPresContext->CompatibilityModeChanged();
+// setup the preference style rules (no forced reflow), and do it
+// before creating any frames.
+SetPreferenceStyleRules(false);
+NS_ADDREF(mSelection = new nsFrameSelection());
+mSelection->Init(this, nullptr);
+// Important: this has to happen after the selection has been set up
+#ifdef SHOW_CARET
+// make the caret
+mCaret = new nsCaret();
+mCaret->Init(this);
+mOriginalCaret = mCaret;
+//SetCaretEnabled(true);       // make it show in browser windows
+#endif
+//set up selection to be displayed in document
+// Don't enable selection for print media
+nsPresContext::nsPresContextType type = aPresContext->Type();
+if (type != nsPresContext::eContext_PrintPreview &&
+type != nsPresContext::eContext_Print)
+SetDisplaySelection(nsISelectionController::SELECTION_DISABLED);
+if (gMaxRCProcessingTime == -1) {
+gMaxRCProcessingTime =
+Preferences::GetInt("layout.reflow.timeslice", NS_MAX_REFLOW_TIME);
+}
+{
+nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+if (os) {
+os->AddObserver(this, "agent-sheet-added", false);
+os->AddObserver(this, "user-sheet-added", false);
+os->AddObserver(this, "author-sheet-added", false);
+os->AddObserver(this, "agent-sheet-removed", false);
+os->AddObserver(this, "user-sheet-removed", false);
+os->AddObserver(this, "author-sheet-removed", false);
+#ifdef MOZ_XUL
+os->AddObserver(this, "chrome-flush-skin-caches", false);
+#endif
+}
+}
+#ifdef MOZ_REFLOW_PERF
+if (mReflowCountMgr) {
+bool paintFrameCounts =
+Preferences::GetBool("layout.reflow.showframecounts");
+bool dumpFrameCounts =
+Preferences::GetBool("layout.reflow.dumpframecounts");
+bool dumpFrameByFrameCounts =
+Preferences::GetBool("layout.reflow.dumpframebyframecounts");
+mReflowCountMgr->SetDumpFrameCounts(dumpFrameCounts);
+mReflowCountMgr->SetDumpFrameByFrameCounts(dumpFrameByFrameCounts);
+mReflowCountMgr->SetPaintFrameCounts(paintFrameCounts);
+}
+#endif
+if (mDocument->HasAnimationController()) {
+nsSMILAnimationController* animCtrl = mDocument->GetAnimationController();
+animCtrl->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
+}
+// Get our activeness from the docShell.
+QueryIsActive();
+// Setup our font inflation preferences.
+SetupFontInflation();
+}
+#ifdef PR_LOGGING
+enum TextPerfLogType {
+eLog_reflow,
+eLog_loaddone,
+eLog_totals
+};
+static void
+LogTextPerfStats(gfxTextPerfMetrics* aTextPerf,
+PresShell* aPresShell,
+const gfxTextPerfMetrics::TextCounts& aCounts,
+float aTime, TextPerfLogType aLogType, const char* aURL)
+{
+char prefix[256];
+switch (aLogType) {
+case eLog_reflow:
+sprintf(prefix, "(textperf-reflow) %p time-ms: %7.0f", aPresShell, aTime);
+break;
+case eLog_loaddone:
+sprintf(prefix, "(textperf-loaddone) %p time-ms: %7.0f", aPresShell, aTime);
+break;
+default:
+MOZ_ASSERT(aLogType == eLog_totals, "unknown textperf log type");
+sprintf(prefix, "(textperf-totals) %p", aPresShell);
+}
+PRLogModuleInfo* tpLog = gfxPlatform::GetLog(eGfxLog_textperf);
+// ignore XUL contexts unless at debug level
+PRLogModuleLevel logLevel = PR_LOG_WARNING;
+if (aCounts.numContentTextRuns == 0) {
+logLevel = PR_LOG_DEBUG;
+}
+double hitRatio = 0.0;
+uint32_t lookups = aCounts.wordCacheHit + aCounts.wordCacheMiss;
+if (lookups) {
+hitRatio = double(aCounts.wordCacheHit) / double(lookups);
+}
+if (aLogType == eLog_loaddone) {
+PR_LOG(tpLog, logLevel,
+("%s reflow: %d chars: %d "
+"[%s] "
+"content-textruns: %d chrome-textruns: %d "
+"max-textrun-len: %d "
+"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
+"word-cache-space: %d word-cache-long: %d "
+"pref-fallbacks: %d system-fallbacks: %d "
+"textruns-const: %d textruns-destr: %d "
+"cumulative-textruns-destr: %d\n",
+prefix, aTextPerf->reflowCount, aCounts.numChars,
+(aURL ? aURL : ""),
+aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
+aCounts.maxTextRunLen,
+lookups, hitRatio,
+aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
+aCounts.fallbackPrefs, aCounts.fallbackSystem,
+aCounts.textrunConst, aCounts.textrunDestr,
+aTextPerf->cumulative.textrunDestr));
+} else {
+PR_LOG(tpLog, logLevel,
+("%s reflow: %d chars: %d "
+"content-textruns: %d chrome-textruns: %d "
+"max-textrun-len: %d "
+"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
+"word-cache-space: %d word-cache-long: %d "
+"pref-fallbacks: %d system-fallbacks: %d "
+"textruns-const: %d textruns-destr: %d "
+"cumulative-textruns-destr: %d\n",
+prefix, aTextPerf->reflowCount, aCounts.numChars,
+aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
+aCounts.maxTextRunLen,
+lookups, hitRatio,
+aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
+aCounts.fallbackPrefs, aCounts.fallbackSystem,
+aCounts.textrunConst, aCounts.textrunDestr,
+aTextPerf->cumulative.textrunDestr));
+}
+}
+#endif
+void
+PresShell::Destroy()
+{
+NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
+"destroy called on presshell while scripts not blocked");
+// dump out cumulative text perf metrics
+#ifdef PR_LOGGING
+gfxTextPerfMetrics* tp;
+if (mPresContext && (tp = mPresContext->GetTextPerfMetrics())) {
+tp->Accumulate();
+if (tp->cumulative.numChars > 0) {
+LogTextPerfStats(tp, this, tp->cumulative, 0.0, eLog_totals, nullptr);
+}
+}
+#endif
+#ifdef MOZ_REFLOW_PERF
+DumpReflows();
+if (mReflowCountMgr) {
+delete mReflowCountMgr;
+mReflowCountMgr = nullptr;
+}
+#endif
+if (mHaveShutDown)
+return;
+#ifdef ACCESSIBILITY
+if (mDocAccessible) {
+#ifdef DEBUG
+if (a11y::logging::IsEnabled(a11y::logging::eDocDestroy))
+a11y::logging::DocDestroy("presshell destroyed", mDocument);
+#endif
+mDocAccessible->Shutdown();
+mDocAccessible = nullptr;
+}
+#endif // ACCESSIBILITY
+MaybeReleaseCapturingContent();
+if (gKeyDownTarget && gKeyDownTarget->OwnerDoc() == mDocument) {
+NS_RELEASE(gKeyDownTarget);
+}
+if (mContentToScrollTo) {
+mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
+mContentToScrollTo = nullptr;
+}
+if (mPresContext) {
+// We need to notify the destroying the nsPresContext to ESM for
+// suppressing to use from ESM.
+mPresContext->EventStateManager()->NotifyDestroyPresContext(mPresContext);
+}
+{
+nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+if (os) {
+os->RemoveObserver(this, "agent-sheet-added");
+os->RemoveObserver(this, "user-sheet-added");
+os->RemoveObserver(this, "author-sheet-added");
+os->RemoveObserver(this, "agent-sheet-removed");
+os->RemoveObserver(this, "user-sheet-removed");
+os->RemoveObserver(this, "author-sheet-removed");
+#ifdef MOZ_XUL
+os->RemoveObserver(this, "chrome-flush-skin-caches");
+#endif
+}
+}
+// If our paint suppression timer is still active, kill it.
+if (mPaintSuppressionTimer) {
+mPaintSuppressionTimer->Cancel();
+mPaintSuppressionTimer = nullptr;
+}
+// Same for our reflow continuation timer
+if (mReflowContinueTimer) {
+mReflowContinueTimer->Cancel();
+mReflowContinueTimer = nullptr;
+}
+if (mDelayedPaintTimer) {
+mDelayedPaintTimer->Cancel();
+mDelayedPaintTimer = nullptr;
+}
+mSynthMouseMoveEvent.Revoke();
+mUpdateImageVisibilityEvent.Revoke();
+ClearVisibleImagesList();
+if (mCaret) {
+mCaret->Terminate();
+mCaret = nullptr;
+}
+if (mSelection) {
+mSelection->DisconnectFromPresShell();
+}
+// release our pref style sheet, if we have one still
+ClearPreferenceStyleRules();
+mIsDestroying = true;
+// We can't release all the event content in
+// mCurrentEventContentStack here since there might be code on the
+// stack that will release the event content too. Double release
+// bad!
+// The frames will be torn down, so remove them from the current
+// event frame stack (since they'd be dangling references if we'd
+// leave them in) and null out the mCurrentEventFrame pointer as
+// well.
+mCurrentEventFrame = nullptr;
+int32_t i, count = mCurrentEventFrameStack.Length();
+for (i = 0; i < count; i++) {
+mCurrentEventFrameStack[i] = nullptr;
+}
+mFramesToDirty.Clear();
+if (mViewManager) {
+// Clear the view manager's weak pointer back to |this| in case it
+// was leaked.
+mViewManager->SetPresShell(nullptr);
+mViewManager = nullptr;
+}
+mStyleSet->BeginShutdown(mPresContext);
+nsRefreshDriver* rd = GetPresContext()->RefreshDriver();
+// This shell must be removed from the document before the frame
+// hierarchy is torn down to avoid finding deleted frames through
+// this presshell while the frames are being torn down
+if (mDocument) {
+NS_ASSERTION(mDocument->GetShell() == this, "Wrong shell?");
+mDocument->DeleteShell();
+if (mDocument->HasAnimationController()) {
+mDocument->GetAnimationController()->NotifyRefreshDriverDestroying(rd);
+}
+}
+// Revoke any pending events.  We need to do this and cancel pending reflows
+// before we destroy the frame manager, since apparently frame destruction
+// sometimes spins the event queue when plug-ins are involved(!).
+rd->RemoveLayoutFlushObserver(this);
+if (mHiddenInvalidationObserverRefreshDriver) {
+mHiddenInvalidationObserverRefreshDriver->RemovePresShellToInvalidateIfHidden(this);
+}
+if (rd->PresContext() == GetPresContext()) {
+rd->RevokeViewManagerFlush();
+}
+mResizeEvent.Revoke();
+if (mAsyncResizeTimerIsActive) {
+mAsyncResizeEventTimer->Cancel();
+mAsyncResizeTimerIsActive = false;
+}
+CancelAllPendingReflows();
+CancelPostedReflowCallbacks();
+// Destroy the frame manager. This will destroy the frame hierarchy
+mFrameConstructor->WillDestroyFrameTree();
+// Destroy all frame properties (whose destruction was suppressed
+// while destroying the frame tree, but which might contain more
+// frames within the properties.
+if (mPresContext) {
+// Clear out the prescontext's property table -- since our frame tree is
+// now dead, we shouldn't be looking up any more properties in that table.
+// We want to do this before we call SetShell() on the prescontext, so
+// property destructors can usefully call GetPresShell() on the
+// prescontext.
+mPresContext->PropertyTable()->DeleteAll();
+}
+NS_WARN_IF_FALSE(!mWeakFrames, "Weak frames alive after destroying FrameManager");
+while (mWeakFrames) {
+mWeakFrames->Clear(this);
+}
+// Let the style set do its cleanup.
+mStyleSet->Shutdown(mPresContext);
+if (mPresContext) {
+// We hold a reference to the pres context, and it holds a weak link back
+// to us. To avoid the pres context having a dangling reference, set its
+// pres shell to nullptr
+mPresContext->SetShell(nullptr);
+// Clear the link handler (weak reference) as well
+mPresContext->SetLinkHandler(nullptr);
+}
+mHaveShutDown = true;
+EvictTouches();
+}
+void
+PresShell::MakeZombie()
+{
+mIsZombie = true;
+CancelAllPendingReflows();
+}
+void
+nsIPresShell::SetAuthorStyleDisabled(bool aStyleDisabled)
+{
+if (aStyleDisabled != mStyleSet->GetAuthorStyleDisabled()) {
+mStyleSet->SetAuthorStyleDisabled(aStyleDisabled);
+ReconstructStyleData();
+nsCOMPtr<nsIObserverService> observerService =
+mozilla::services::GetObserverService();
+if (observerService) {
+observerService->NotifyObservers(mDocument,
+"author-style-disabled-changed",
+nullptr);
+}
+}
+}
+bool
+nsIPresShell::GetAuthorStyleDisabled() const
+{
+return mStyleSet->GetAuthorStyleDisabled();
+}
+nsresult
+PresShell::SetPreferenceStyleRules(bool aForceReflow)
+{
+if (!mDocument) {
+return NS_ERROR_NULL_POINTER;
+}
+nsPIDOMWindow *window = mDocument->GetWindow();
+// If the document doesn't have a window there's no need to notify
+// its presshell about changes to preferences since the document is
+// in a state where it doesn't matter any more (see
+// nsDocumentViewer::Close()).
+if (!window) {
+return NS_ERROR_NULL_POINTER;
+}
+NS_PRECONDITION(mPresContext, "presContext cannot be null");
+if (mPresContext) {
+// first, make sure this is not a chrome shell
+if (nsContentUtils::IsInChromeDocshell(mDocument)) {
+return NS_OK;
+}
+#ifdef DEBUG_attinasi
+printf("Setting Preference Style Rules:\n");
+#endif
+// if here, we need to create rules for the prefs
+// - this includes the background-color, the text-color,
+//   the link color, the visited link color and the link-underlining
+// first clear any exising rules
+nsresult result = ClearPreferenceStyleRules();
+// now the link rules (must come after the color rules, or links will not be correct color!)
+// XXX - when there is both an override and agent pref stylesheet this won't matter,
+//       as the color rules will be overrides and the links rules will be agent
+if (NS_SUCCEEDED(result)) {
+result = SetPrefLinkRules();
+}
+if (NS_SUCCEEDED(result)) {
+result = SetPrefFocusRules();
+}
+if (NS_SUCCEEDED(result)) {
+result = SetPrefNoScriptRule();
+}
+if (NS_SUCCEEDED(result)) {
+result = SetPrefNoFramesRule();
+}
+#ifdef DEBUG_attinasi
+printf( "Preference Style Rules set: error=%ld\n", (long)result);
+#endif
+// Note that this method never needs to force any calculation; the caller
+// will recalculate style if needed
+return result;
+}
+return NS_ERROR_NULL_POINTER;
+}
+nsresult PresShell::ClearPreferenceStyleRules(void)
+{
+nsresult result = NS_OK;
+if (mPrefStyleSheet) {
+NS_ASSERTION(mStyleSet, "null styleset entirely unexpected!");
+if (mStyleSet) {
+// remove the sheet from the styleset:
+// - note that we have to check for success by comparing the count before and after...
+#ifdef DEBUG
+int32_t numBefore = mStyleSet->SheetCount(nsStyleSet::eUserSheet);
+NS_ASSERTION(numBefore > 0, "no user stylesheets in styleset, but we have one!");
+#endif
+mStyleSet->RemoveStyleSheet(nsStyleSet::eUserSheet, mPrefStyleSheet);
+#ifdef DEBUG_attinasi
+NS_ASSERTION((numBefore - 1) == mStyleSet->GetNumberOfUserStyleSheets(),
+"Pref stylesheet was not removed");
+printf("PrefStyleSheet removed\n");
+#endif
+// clear the sheet pointer: it is strictly historical now
+mPrefStyleSheet = nullptr;
+}
+}
+return result;
+}
+nsresult
+PresShell::CreatePreferenceStyleSheet()
+{
+NS_ASSERTION(!mPrefStyleSheet, "prefStyleSheet already exists");
+mPrefStyleSheet = new nsCSSStyleSheet(CORS_NONE);
+nsCOMPtr<nsIURI> uri;
+nsresult rv = NS_NewURI(getter_AddRefs(uri), "about:PreferenceStyleSheet", nullptr);
+if (NS_FAILED(rv)) {
+mPrefStyleSheet = nullptr;
+return rv;
+}
+NS_ASSERTION(uri, "null but no error");
+mPrefStyleSheet->SetURIs(uri, uri, uri);
+mPrefStyleSheet->SetComplete();
+uint32_t index;
+rv =
+mPrefStyleSheet->InsertRuleInternal(NS_LITERAL_STRING("@namespace svg url(http://www.w3.org/2000/svg);"),
+0, &index);
+if (NS_FAILED(rv)) {
+mPrefStyleSheet = nullptr;
+return rv;
+}
+rv =
+mPrefStyleSheet->InsertRuleInternal(NS_LITERAL_STRING("@namespace url(http://www.w3.org/1999/xhtml);"),
+0, &index);
+if (NS_FAILED(rv)) {
+mPrefStyleSheet = nullptr;
+return rv;
+}
+mStyleSet->AppendStyleSheet(nsStyleSet::eUserSheet, mPrefStyleSheet);
+return NS_OK;
+}
+// XXX We want these after the @namespace rules.  Does order matter
+// for these rules, or can we call StyleRule::StyleRuleCount()
+// and just "append"?
+static uint32_t sInsertPrefSheetRulesAt = 2;
+nsresult
+PresShell::SetPrefNoScriptRule()
+{
+nsresult rv = NS_OK;
+// also handle the case where print is done from print preview
+// see bug #342439 for more details
+nsIDocument* doc = mDocument;
+if (doc->IsStaticDocument()) {
+doc = doc->GetOriginalDocument();
+}
+bool scriptEnabled = doc->IsScriptEnabled();
+if (scriptEnabled) {
+if (!mPrefStyleSheet) {
+rv = CreatePreferenceStyleSheet();
+NS_ENSURE_SUCCESS(rv, rv);
+}
+uint32_t index = 0;
+mPrefStyleSheet->
+InsertRuleInternal(NS_LITERAL_STRING("noscript{display:none!important}"),
+sInsertPrefSheetRulesAt, &index);
+}
+return rv;
+}
+nsresult PresShell::SetPrefNoFramesRule(void)
+{
+NS_ASSERTION(mPresContext,"null prescontext not allowed");
+if (!mPresContext) {
+return NS_ERROR_FAILURE;
+}
+nsresult rv = NS_OK;
+if (!mPrefStyleSheet) {
+rv = CreatePreferenceStyleSheet();
+NS_ENSURE_SUCCESS(rv, rv);
+}
+NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
+bool allowSubframes = true;
+nsCOMPtr<nsIDocShell> docShell(mPresContext->GetDocShell());
+if (docShell) {
+docShell->GetAllowSubframes(&allowSubframes);
+}
+if (!allowSubframes) {
+uint32_t index = 0;
+rv = mPrefStyleSheet->
+InsertRuleInternal(NS_LITERAL_STRING("noframes{display:block}"),
+sInsertPrefSheetRulesAt, &index);
+NS_ENSURE_SUCCESS(rv, rv);
+rv = mPrefStyleSheet->
+InsertRuleInternal(NS_LITERAL_STRING("frame, frameset, iframe {display:none!important}"),
+sInsertPrefSheetRulesAt, &index);
+}
+return rv;
+}
+nsresult PresShell::SetPrefLinkRules(void)
+{
+NS_ASSERTION(mPresContext,"null prescontext not allowed");
+if (!mPresContext) {
+return NS_ERROR_FAILURE;
+}
+nsresult rv = NS_OK;
+if (!mPrefStyleSheet) {
+rv = CreatePreferenceStyleSheet();
+NS_ENSURE_SUCCESS(rv, rv);
+}
+NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
+// support default link colors:
+//   this means the link colors need to be overridable,
+//   which they are if we put them in the agent stylesheet,
+//   though if using an override sheet this will cause authors grief still
+//   In the agent stylesheet, they are !important when we are ignoring document colors
+nscolor linkColor(mPresContext->DefaultLinkColor());
+nscolor activeColor(mPresContext->DefaultActiveLinkColor());
+nscolor visitedColor(mPresContext->DefaultVisitedLinkColor());
+NS_NAMED_LITERAL_STRING(ruleClose, "}");
+uint32_t index = 0;
+nsAutoString strColor;
+// insert a rule to color links: '*|*:link {color: #RRGGBB [!important];}'
+ColorToString(linkColor, strColor);
+rv = mPrefStyleSheet->
+InsertRuleInternal(NS_LITERAL_STRING("*|*:link{color:") +
+strColor + ruleClose,
+sInsertPrefSheetRulesAt, &index);
+NS_ENSURE_SUCCESS(rv, rv);
+// - visited links: '*|*:visited {color: #RRGGBB [!important];}'
+ColorToString(visitedColor, strColor);
+rv = mPrefStyleSheet->
+InsertRuleInternal(NS_LITERAL_STRING("*|*:visited{color:") +
+strColor + ruleClose,
+sInsertPrefSheetRulesAt, &index);
+NS_ENSURE_SUCCESS(rv, rv);
+// - active links: '*|*:-moz-any-link:active {color: #RRGGBB [!important];}'
+ColorToString(activeColor, strColor);
+rv = mPrefStyleSheet->
+InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link:active{color:") +
+strColor + ruleClose,
+sInsertPrefSheetRulesAt, &index);
+NS_ENSURE_SUCCESS(rv, rv);
+bool underlineLinks =
+mPresContext->GetCachedBoolPref(kPresContext_UnderlineLinks);
+if (underlineLinks) {
+// create a rule to make underlining happen
+//  '*|*:-moz-any-link {text-decoration:[underline|none];}'
+// no need for important, we want these to be overridable
+// NOTE: these must go in the agent stylesheet or they cannot be
+//       overridden by authors
+rv = mPrefStyleSheet->
+InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link:not(svg|a){text-decoration:underline}"),
+sInsertPrefSheetRulesAt, &index);
+} else {
+rv = mPrefStyleSheet->
+InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link{text-decoration:none}"),
+sInsertPrefSheetRulesAt, &index);
+}
+return rv;
+}
+nsresult PresShell::SetPrefFocusRules(void)
+{
+NS_ASSERTION(mPresContext,"null prescontext not allowed");
+nsresult result = NS_OK;
+if (!mPresContext)
+result = NS_ERROR_FAILURE;
+if (NS_SUCCEEDED(result) && !mPrefStyleSheet)
+result = CreatePreferenceStyleSheet();
+if (NS_SUCCEEDED(result)) {
+NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
+if (mPresContext->GetUseFocusColors()) {
+nscolor focusBackground(mPresContext->FocusBackgroundColor());
+nscolor focusText(mPresContext->FocusTextColor());
+// insert a rule to make focus the preferred color
+uint32_t index = 0;
+nsAutoString strRule, strColor;
+///////////////////////////////////////////////////////////////
+// - focus: '*:focus
+ColorToString(focusText,strColor);
+strRule.AppendLiteral("*:focus,*:focus>font {color: ");
+strRule.Append(strColor);
+strRule.AppendLiteral(" !important; background-color: ");
+ColorToString(focusBackground,strColor);
+strRule.Append(strColor);
+strRule.AppendLiteral(" !important; } ");
+// insert the rules
+result = mPrefStyleSheet->
+InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
+}
+uint8_t focusRingWidth = mPresContext->FocusRingWidth();
+bool focusRingOnAnything = mPresContext->GetFocusRingOnAnything();
+uint8_t focusRingStyle = mPresContext->GetFocusRingStyle();
+if ((NS_SUCCEEDED(result) && focusRingWidth != 1 && focusRingWidth <= 4 ) || focusRingOnAnything) {
+uint32_t index = 0;
+nsAutoString strRule;
+if (!focusRingOnAnything)
+strRule.AppendLiteral("*|*:link:focus, *|*:visited");    // If we only want focus rings on the normal things like links
+strRule.AppendLiteral(":focus {outline: ");     // For example 3px dotted WindowText (maximum 4)
+strRule.AppendInt(focusRingWidth);
+if (focusRingStyle == 0) // solid
+strRule.AppendLiteral("px solid -moz-mac-focusring !important; -moz-outline-radius: 3px; outline-offset: 1px; } ");
+else // dotted
+strRule.AppendLiteral("px dotted WindowText !important; } ");
+// insert the rules
+result = mPrefStyleSheet->
+InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
+NS_ENSURE_SUCCESS(result, result);
+if (focusRingWidth != 1) {
+// If the focus ring width is different from the default, fix buttons with rings
+strRule.AssignLiteral("button::-moz-focus-inner, input[type=\"reset\"]::-moz-focus-inner,");
+strRule.AppendLiteral("input[type=\"button\"]::-moz-focus-inner, ");
+strRule.AppendLiteral("input[type=\"submit\"]::-moz-focus-inner { padding: 1px 2px 1px 2px; border: ");
+strRule.AppendInt(focusRingWidth);
+if (focusRingStyle == 0) // solid
+strRule.AppendLiteral("px solid transparent !important; } ");
+else
+strRule.AppendLiteral("px dotted transparent !important; } ");
+result = mPrefStyleSheet->
+InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
+NS_ENSURE_SUCCESS(result, result);
+strRule.AssignLiteral("button:focus::-moz-focus-inner, input[type=\"reset\"]:focus::-moz-focus-inner,");
+strRule.AppendLiteral("input[type=\"button\"]:focus::-moz-focus-inner, input[type=\"submit\"]:focus::-moz-focus-inner {");
+strRule.AppendLiteral("border-color: ButtonText !important; }");
+result = mPrefStyleSheet->
+InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
+}
+}
+}
+return result;
+}
+void
+PresShell::AddUserSheet(nsISupports* aSheet)
+{
+// Make sure this does what nsDocumentViewer::CreateStyleSet does wrt
+// ordering. We want this new sheet to come after all the existing stylesheet
+// service sheets, but before other user sheets; see nsIStyleSheetService.idl
+// for the ordering.  Just remove and readd all the nsStyleSheetService
+// sheets.
+nsCOMPtr<nsIStyleSheetService> dummy =
+do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
+mStyleSet->BeginUpdate();
+nsStyleSheetService *sheetService = nsStyleSheetService::gInstance;
+nsCOMArray<nsIStyleSheet> & userSheets = *sheetService->UserStyleSheets();
+int32_t i;
+// Iterate forwards when removing so the searches for RemoveStyleSheet are as
+// short as possible.
+for (i = 0; i < userSheets.Count(); ++i) {
+mStyleSet->RemoveStyleSheet(nsStyleSet::eUserSheet, userSheets[i]);
+}
+// Now iterate backwards, so that the order of userSheets will be the same as
+// the order of sheets from it in the style set.
+for (i = userSheets.Count() - 1; i >= 0; --i) {
+mStyleSet->PrependStyleSheet(nsStyleSet::eUserSheet, userSheets[i]);
+}
+mStyleSet->EndUpdate();
+ReconstructStyleData();
+}
+void
+PresShell::AddAgentSheet(nsISupports* aSheet)
+{
+// Make sure this does what nsDocumentViewer::CreateStyleSet does
+// wrt ordering.
+nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
+if (!sheet) {
+return;
+}
+mStyleSet->AppendStyleSheet(nsStyleSet::eAgentSheet, sheet);
+ReconstructStyleData();
+}
+void
+PresShell::AddAuthorSheet(nsISupports* aSheet)
+{
+nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
+if (!sheet) {
+return;
+}
+// Document specific "additional" Author sheets should be stronger than the ones
+// added with the StyleSheetService.
+nsIStyleSheet* firstAuthorSheet = mDocument->FirstAdditionalAuthorSheet();
+if (firstAuthorSheet) {
+mStyleSet->InsertStyleSheetBefore(nsStyleSet::eDocSheet, sheet, firstAuthorSheet);
+} else {
+mStyleSet->AppendStyleSheet(nsStyleSet::eDocSheet, sheet);
+}
+ReconstructStyleData();
+}
+void
+PresShell::RemoveSheet(nsStyleSet::sheetType aType, nsISupports* aSheet)
+{
+nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
+if (!sheet) {
+return;
+}
+mStyleSet->RemoveStyleSheet(aType, sheet);
+ReconstructStyleData();
+}
+NS_IMETHODIMP
+PresShell::SetDisplaySelection(int16_t aToggle)
+{
+mSelection->SetDisplaySelection(aToggle);
+return NS_OK;
+}
+NS_IMETHODIMP
+PresShell::GetDisplaySelection(int16_t *aToggle)
+{
+*aToggle = mSelection->GetDisplaySelection();
+return NS_OK;
+}
+NS_IMETHODIMP
+PresShell::GetSelection(SelectionType aType, nsISelection **aSelection)
+{
+if (!aSelection || !mSelection)
+return NS_ERROR_NULL_POINTER;
+*aSelection = mSelection->GetSelection(aType);
+if (!(*aSelection))
+return NS_ERROR_INVALID_ARG;
+NS_ADDREF(*aSelection);
+return NS_OK;
+}
+Selection*
+PresShell::GetCurrentSelection(SelectionType aType)
+{
+if (!mSelection)
+return nullptr;
+return mSelection->GetSelection(aType);
+}
+NS_IMETHODIMP
+PresShell::ScrollSelectionIntoView(SelectionType aType, SelectionRegion aRegion,
+int16_t aFlags)
+{
+if (!mSelection)
+return NS_ERROR_NULL_POINTER;
+return mSelection->ScrollSelectionIntoView(aType, aRegion, aFlags);
+}
+NS_IMETHODIMP
+PresShell::RepaintSelection(SelectionType aType)
+{
+if (!mSelection)
+return NS_ERROR_NULL_POINTER;
+return mSelection->RepaintSelection(aType);
+}
+// Make shell be a document observer
+void
+PresShell::BeginObservingDocument()
+{
+if (mDocument && !mIsDestroying) {
+mDocument->AddObserver(this);
+if (mIsDocumentGone) {
+NS_WARNING("Adding a presshell that was disconnected from the document "
+"as a document observer?  Sounds wrong...");
+mIsDocumentGone = false;
+}
+}
+}
+// Make shell stop being a document observer
+void
+PresShell::EndObservingDocument()
+{
+// XXXbz do we need to tell the frame constructor that the document
+// is gone, perhaps?  Except for printing it's NOT gone, sometimes.
+mIsDocumentGone = true;
+if (mDocument) {
+mDocument->RemoveObserver(this);
+}
+}
+#ifdef DEBUG_kipp
+char* nsPresShell_ReflowStackPointerTop;
+#endif
+nsresult
+PresShell::Initialize(nscoord aWidth, nscoord aHeight)
+{
+if (mIsDestroying) {
+return NS_OK;
+}
+if (!mDocument) {
+// Nothing to do
+return NS_OK;
+}
+mozilla::TimeStamp timerStart = mozilla::TimeStamp::Now();
+NS_ASSERTION(!mDidInitialize, "Why are we being called?");
+nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
+mDidInitialize = true;
+#ifdef DEBUG
+if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
+if (mDocument) {
+nsIURI *uri = mDocument->GetDocumentURI();
+if (uri) {
+nsAutoCString url;
+uri->GetSpec(url);
+printf("*** PresShell::Initialize (this=%p, url='%s')\n", (void*)this, url.get());
+}
+}
+}
+#endif
+if (mCaret)
+mCaret->EraseCaret();
+// XXX Do a full invalidate at the beginning so that invalidates along
+// the way don't have region accumulation issues?
+mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
+// Get the root frame from the frame manager
+// XXXbz it would be nice to move this somewhere else... like frame manager
+// Init(), say.  But we need to make sure our views are all set up by the
+// time we do this!
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+NS_ASSERTION(!rootFrame, "How did that happen, exactly?");
+if (!rootFrame) {
+nsAutoScriptBlocker scriptBlocker;
+mFrameConstructor->BeginUpdate();
+rootFrame = mFrameConstructor->ConstructRootFrame();
+mFrameConstructor->SetRootFrame(rootFrame);
+mFrameConstructor->EndUpdate();
+}
+NS_ENSURE_STATE(!mHaveShutDown);
+if (!rootFrame) {
+return NS_ERROR_OUT_OF_MEMORY;
+}
+for (nsIFrame* f = rootFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
+if (f->GetStateBits() & NS_FRAME_NO_COMPONENT_ALPHA) {
+f->InvalidateFrameSubtree();
+f->RemoveStateBits(NS_FRAME_NO_COMPONENT_ALPHA);
+}
+}
+Element *root = mDocument->GetRootElement();
+if (root) {
+{
+nsAutoCauseReflowNotifier reflowNotifier(this);
+mFrameConstructor->BeginUpdate();
+// Have the style sheet processor construct frame for the root
+// content object down
+mFrameConstructor->ContentInserted(nullptr, root, nullptr, false);
+VERIFY_STYLE_TREE;
+// Something in mFrameConstructor->ContentInserted may have caused
+// Destroy() to get called, bug 337586.
+NS_ENSURE_STATE(!mHaveShutDown);
+mFrameConstructor->EndUpdate();
+}
+// nsAutoScriptBlocker going out of scope may have killed us too
+NS_ENSURE_STATE(!mHaveShutDown);
+// Run the XBL binding constructors for any new frames we've constructed
+mDocument->BindingManager()->ProcessAttachedQueue();
+// Constructors may have killed us too
+NS_ENSURE_STATE(!mHaveShutDown);
+// Now flush out pending restyles before we actually reflow, in
+// case XBL constructors changed styles somewhere.
+{
+nsAutoScriptBlocker scriptBlocker;
+mPresContext->RestyleManager()->ProcessPendingRestyles();
+}
+// And that might have run _more_ XBL constructors
+NS_ENSURE_STATE(!mHaveShutDown);
+}
+NS_ASSERTION(rootFrame, "How did that happen?");
+// Note: when the frame was created above it had the NS_FRAME_IS_DIRTY bit
+// set, but XBL processing could have caused a reflow which clears it.
+if (MOZ_LIKELY(rootFrame->GetStateBits() & NS_FRAME_IS_DIRTY)) {
+// Unset the DIRTY bits so that FrameNeedsReflow() will work right.
+rootFrame->RemoveStateBits(NS_FRAME_IS_DIRTY |
+NS_FRAME_HAS_DIRTY_CHILDREN);
+NS_ASSERTION(!mDirtyRoots.Contains(rootFrame),
+"Why is the root in mDirtyRoots already?");
+FrameNeedsReflow(rootFrame, eResize, NS_FRAME_IS_DIRTY);
+NS_ASSERTION(mDirtyRoots.Contains(rootFrame),
+"Should be in mDirtyRoots now");
+NS_ASSERTION(mReflowScheduled, "Why no reflow scheduled?");
+}
+// Restore our root scroll position now if we're getting here after EndLoad
+// got called, since this is our one chance to do it.  Note that we need not
+// have reflowed for this to work; when the scrollframe is finally reflowed
+// it'll pick up the position we store in it here.
+if (!mDocumentLoading) {
+RestoreRootScrollPosition();
+}
+// For printing, we just immediately unsuppress.
+if (!mPresContext->IsPaginated()) {
+// Kick off a one-shot timer based off our pref value.  When this timer
+// fires, if painting is still locked down, then we will go ahead and
+// trigger a full invalidate and allow painting to proceed normally.
+mPaintingSuppressed = true;
+// Don't suppress painting if the document isn't loading.
+nsIDocument::ReadyState readyState = mDocument->GetReadyStateEnum();
+if (readyState != nsIDocument::READYSTATE_COMPLETE) {
+mPaintSuppressionTimer = do_CreateInstance("@mozilla.org/timer;1");
+}
+if (!mPaintSuppressionTimer) {
+mPaintingSuppressed = false;
+} else {
+// Initialize the timer.
+// Default to PAINTLOCK_EVENT_DELAY if we can't get the pref value.
+int32_t delay =
+Preferences::GetInt("nglayout.initialpaint.delay",
+PAINTLOCK_EVENT_DELAY);
+mPaintSuppressionTimer->InitWithFuncCallback(sPaintSuppressionCallback,
+this, delay,
+nsITimer::TYPE_ONE_SHOT);
+}
+}
+if (root && root->IsXUL()) {
+mozilla::Telemetry::AccumulateTimeDelta(Telemetry::XUL_INITIAL_FRAME_CONSTRUCTION,
+timerStart);
+}
+return NS_OK; //XXX this needs to be real. MMP
+}
+void
+PresShell::sPaintSuppressionCallback(nsITimer *aTimer, void* aPresShell)
+{
+nsRefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
+if (self)
+self->UnsuppressPainting();
+}
+void
+PresShell::AsyncResizeEventCallback(nsITimer* aTimer, void* aPresShell)
+{
+static_cast<PresShell*>(aPresShell)->FireResizeEvent();
+}
+nsresult
+PresShell::ResizeReflowOverride(nscoord aWidth, nscoord aHeight)
+{
+mViewportOverridden = true;
+return ResizeReflowIgnoreOverride(aWidth, aHeight);
+}
+nsresult
+PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight)
+{
+if (mViewportOverridden) {
+// The viewport has been overridden, and this reflow request
+// didn't ask to ignore the override.  Pretend it didn't happen.
+return NS_OK;
+}
+return ResizeReflowIgnoreOverride(aWidth, aHeight);
+}
+nsresult
+PresShell::ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight)
+{
+NS_PRECONDITION(!mIsReflowing, "Shouldn't be in reflow here!");
+NS_PRECONDITION(aWidth != NS_UNCONSTRAINEDSIZE,
+"shouldn't use unconstrained widths anymore");
+// If we don't have a root frame yet, that means we haven't had our initial
+// reflow... If that's the case, and aWidth or aHeight is unconstrained,
+// ignore them altogether.
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+if (!rootFrame && aHeight == NS_UNCONSTRAINEDSIZE) {
+// We can't do the work needed for SizeToContent without a root
+// frame, and we want to return before setting the visible area.
+return NS_ERROR_NOT_AVAILABLE;
+}
+mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
+// There isn't anything useful we can do if the initial reflow hasn't happened.
+if (!rootFrame) {
+return NS_OK;
+}
+nsRefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
+// Take this ref after viewManager so it'll make sure to go away first.
+nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
+if (!GetPresContext()->SupressingResizeReflow()) {
+// Have to make sure that the content notifications are flushed before we
+// start messing with the frame model; otherwise we can get content doubling.
+mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
+// Make sure style is up to date
+{
+nsAutoScriptBlocker scriptBlocker;
+mPresContext->RestyleManager()->ProcessPendingRestyles();
+}
+rootFrame = mFrameConstructor->GetRootFrame();
+if (!mIsDestroying && rootFrame) {
+// XXX Do a full invalidate at the beginning so that invalidates along
+// the way don't have region accumulation issues?
+{
+nsAutoCauseReflowNotifier crNotifier(this);
+WillDoReflow();
+// Kick off a top-down reflow
+AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
+nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
+mDirtyRoots.RemoveElement(rootFrame);
+DoReflow(rootFrame, true);
+}
+DidDoReflow(true, false);
+}
+}
+rootFrame = mFrameConstructor->GetRootFrame();
+if (aHeight == NS_UNCONSTRAINEDSIZE && rootFrame) {
+mPresContext->SetVisibleArea(
+nsRect(0, 0, aWidth, rootFrame->GetRect().height));
+}
+if (!mIsDestroying && !mResizeEvent.IsPending() &&
+!mAsyncResizeTimerIsActive) {
+if (mInResize) {
+if (!mAsyncResizeEventTimer) {
+mAsyncResizeEventTimer = do_CreateInstance("@mozilla.org/timer;1");
+}
+if (mAsyncResizeEventTimer) {
+mAsyncResizeTimerIsActive = true;
+mAsyncResizeEventTimer->InitWithFuncCallback(AsyncResizeEventCallback,
+this, 15,
+nsITimer::TYPE_ONE_SHOT);
+}
+} else {
+nsRefPtr<nsRunnableMethod<PresShell> > resizeEvent =
+NS_NewRunnableMethod(this, &PresShell::FireResizeEvent);
+if (NS_SUCCEEDED(NS_DispatchToCurrentThread(resizeEvent))) {
+mResizeEvent = resizeEvent;
+mDocument->SetNeedStyleFlush();
+}
+}
+}
+return NS_OK; //XXX this needs to be real. MMP
+}
+void
+PresShell::FireResizeEvent()
+{
+if (mAsyncResizeTimerIsActive) {
+mAsyncResizeTimerIsActive = false;
+mAsyncResizeEventTimer->Cancel();
+}
+mResizeEvent.Revoke();
+if (mIsDocumentGone)
+return;
+//Send resize event from here.
+WidgetEvent event(true, NS_RESIZE_EVENT);
+nsEventStatus status = nsEventStatus_eIgnore;
+nsPIDOMWindow *window = mDocument->GetWindow();
+if (window) {
+nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
+mInResize = true;
+EventDispatcher::Dispatch(window, mPresContext, &event, nullptr, &status);
+mInResize = false;
+}
+}
+void
+PresShell::SetIgnoreFrameDestruction(bool aIgnore)
+{
+if (mDocument) {
+// We need to tell the ImageLoader to drop all its references to frames
+// because they're about to go away and it won't get notifications of that.
+mDocument->StyleImageLoader()->ClearFrames();
+}
+mIgnoreFrameDestruction = aIgnore;
+}
+void
+PresShell::NotifyDestroyingFrame(nsIFrame* aFrame)
+{
+if (!mIgnoreFrameDestruction) {
+mDocument->StyleImageLoader()->DropRequestsForFrame(aFrame);
+mFrameConstructor->NotifyDestroyingFrame(aFrame);
+for (int32_t idx = mDirtyRoots.Length(); idx; ) {
+--idx;
+if (mDirtyRoots[idx] == aFrame) {
+mDirtyRoots.RemoveElementAt(idx);
+}
+}
+// Remove frame properties
+mPresContext->NotifyDestroyingFrame(aFrame);
+if (aFrame == mCurrentEventFrame) {
+mCurrentEventContent = aFrame->GetContent();
+mCurrentEventFrame = nullptr;
+}
+#ifdef DEBUG
+if (aFrame == mDrawEventTargetFrame) {
+mDrawEventTargetFrame = nullptr;
+}
+#endif
+for (unsigned int i=0; i < mCurrentEventFrameStack.Length(); i++) {
+if (aFrame == mCurrentEventFrameStack.ElementAt(i)) {
+//One of our stack frames was deleted.  Get its content so that when we
+//pop it we can still get its new frame from its content
+nsIContent *currentEventContent = aFrame->GetContent();
+mCurrentEventContentStack.ReplaceObjectAt(currentEventContent, i);
+mCurrentEventFrameStack[i] = nullptr;
+}
+}
+mFramesToDirty.RemoveEntry(aFrame);
+} else {
+// We must delete this property in situ so that its destructor removes the
+// frame from FrameLayerBuilder::DisplayItemData::mFrameList -- otherwise
+// the DisplayItemData destructor will use the destroyed frame when it
+// tries to remove it from the (array) value of this property.
+mPresContext->PropertyTable()->
+Delete(aFrame, FrameLayerBuilder::LayerManagerDataProperty());
+}
+}
+already_AddRefed<nsCaret> PresShell::GetCaret() const
+{
+nsRefPtr<nsCaret> caret = mCaret;
+return caret.forget();
+}
+void PresShell::MaybeInvalidateCaretPosition()
+{
+if (mCaret) {
+mCaret->InvalidateOutsideCaret();
+}
+}
+void PresShell::SetCaret(nsCaret *aNewCaret)
+{
+mCaret = aNewCaret;
+}
+void PresShell::RestoreCaret()
+{
+mCaret = mOriginalCaret;
+}
+NS_IMETHODIMP PresShell::SetCaretEnabled(bool aInEnable)
+{
+bool oldEnabled = mCaretEnabled;
+mCaretEnabled = aInEnable;
+if (mCaret && (mCaretEnabled != oldEnabled))
+{
+/*  Don't change the caret's selection here! This was an evil side-effect of SetCaretEnabled()
+nsCOMPtr<nsIDOMSelection> domSel;
+if (NS_SUCCEEDED(GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(domSel))) && domSel)
+mCaret->SetCaretDOMSelection(domSel);
+*/
+mCaret->SetCaretVisible(mCaretEnabled);
+}
+return NS_OK;
+}
+NS_IMETHODIMP PresShell::SetCaretReadOnly(bool aReadOnly)
+{
+if (mCaret)
+mCaret->SetCaretReadOnly(aReadOnly);
+return NS_OK;
+}
+NS_IMETHODIMP PresShell::GetCaretEnabled(bool *aOutEnabled)
+{
+NS_ENSURE_ARG_POINTER(aOutEnabled);
+*aOutEnabled = mCaretEnabled;
+return NS_OK;
+}
+NS_IMETHODIMP PresShell::SetCaretVisibilityDuringSelection(bool aVisibility)
+{
+if (mCaret)
+mCaret->SetVisibilityDuringSelection(aVisibility);
+return NS_OK;
+}
+NS_IMETHODIMP PresShell::GetCaretVisible(bool *aOutIsVisible)
+{
+*aOutIsVisible = false;
+if (mCaret) {
+nsresult rv = mCaret->GetCaretVisible(aOutIsVisible);
+NS_ENSURE_SUCCESS(rv,rv);
+}
+return NS_OK;
+}
+NS_IMETHODIMP PresShell::SetSelectionFlags(int16_t aInEnable)
+{
+mSelectionFlags = aInEnable;
+return NS_OK;
+}
+NS_IMETHODIMP PresShell::GetSelectionFlags(int16_t *aOutEnable)
+{
+if (!aOutEnable)
+return NS_ERROR_INVALID_ARG;
+*aOutEnable = mSelectionFlags;
+return NS_OK;
+}
+//implementation of nsISelectionController
+NS_IMETHODIMP
+PresShell::CharacterMove(bool aForward, bool aExtend)
+{
+return mSelection->CharacterMove(aForward, aExtend);
+}
+NS_IMETHODIMP
+PresShell::CharacterExtendForDelete()
+{
+return mSelection->CharacterExtendForDelete();
+}
+NS_IMETHODIMP
+PresShell::CharacterExtendForBackspace()
+{
+return mSelection->CharacterExtendForBackspace();
+}
+NS_IMETHODIMP
+PresShell::WordMove(bool aForward, bool aExtend)
+{
+nsresult result = mSelection->WordMove(aForward, aExtend);
+// if we can't go down/up any more we must then move caret completely to
+// end/beginning respectively.
+if (NS_FAILED(result))
+result = CompleteMove(aForward, aExtend);
+return result;
+}
+NS_IMETHODIMP
+PresShell::WordExtendForDelete(bool aForward)
+{
+return mSelection->WordExtendForDelete(aForward);
+}
+NS_IMETHODIMP
+PresShell::LineMove(bool aForward, bool aExtend)
+{
+nsresult result = mSelection->LineMove(aForward, aExtend);
+// if we can't go down/up any more we must then move caret completely to
+// end/beginning respectively.
+if (NS_FAILED(result))
+result = CompleteMove(aForward,aExtend);
+return result;
+}
+NS_IMETHODIMP
+PresShell::IntraLineMove(bool aForward, bool aExtend)
+{
+return mSelection->IntraLineMove(aForward, aExtend);
+}
+NS_IMETHODIMP
+PresShell::PageMove(bool aForward, bool aExtend)
+{
+nsIScrollableFrame *scrollableFrame =
+GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
+if (!scrollableFrame)
+return NS_OK;
+mSelection->CommonPageMove(aForward, aExtend, scrollableFrame);
+// After ScrollSelectionIntoView(), the pending notifications might be
+// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
+return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
+nsISelectionController::SELECTION_FOCUS_REGION,
+nsISelectionController::SCROLL_SYNCHRONOUS);
+}
+NS_IMETHODIMP
+PresShell::ScrollPage(bool aForward)
+{
+nsIScrollableFrame* scrollFrame =
+GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
+if (scrollFrame) {
+scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
+nsIScrollableFrame::PAGES,
+nsIScrollableFrame::SMOOTH);
+}
+return NS_OK;
+}
+NS_IMETHODIMP
+PresShell::ScrollLine(bool aForward)
+{
+nsIScrollableFrame* scrollFrame =
+GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
+if (scrollFrame) {
+int32_t lineCount = Preferences::GetInt("toolkit.scrollbox.verticalScrollDistance",
+NS_DEFAULT_VERTICAL_SCROLL_DISTANCE);
+scrollFrame->ScrollBy(nsIntPoint(0, aForward ? lineCount : -lineCount),
+nsIScrollableFrame::LINES,
+nsIScrollableFrame::SMOOTH);
+}
+return NS_OK;
+}
+NS_IMETHODIMP
+PresShell::ScrollCharacter(bool aRight)
+{
+nsIScrollableFrame* scrollFrame =
+GetFrameToScrollAsScrollable(nsIPresShell::eHorizontal);
+if (scrollFrame) {
+int32_t h = Preferences::GetInt("toolkit.scrollbox.horizontalScrollDistance",
+NS_DEFAULT_HORIZONTAL_SCROLL_DISTANCE);
+scrollFrame->ScrollBy(nsIntPoint(aRight ? h : -h, 0),
+nsIScrollableFrame::LINES,
+nsIScrollableFrame::SMOOTH);
+}
+return NS_OK;
+}
+NS_IMETHODIMP
+PresShell::CompleteScroll(bool aForward)
+{
+nsIScrollableFrame* scrollFrame =
+GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
+if (scrollFrame) {
+scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
+nsIScrollableFrame::WHOLE,
+nsIScrollableFrame::SMOOTH);
+}
+return NS_OK;
+}
+NS_IMETHODIMP
+PresShell::CompleteMove(bool aForward, bool aExtend)
+{
+// Beware! This may flush notifications via synchronous
+// ScrollSelectionIntoView.
+nsIContent* limiter = mSelection->GetAncestorLimiter();
+nsIFrame* frame = limiter ? limiter->GetPrimaryFrame()
+: FrameConstructor()->GetRootElementFrame();
+if (!frame)
+return NS_ERROR_FAILURE;
+nsIFrame::CaretPosition pos =
+frame->GetExtremeCaretPosition(!aForward);
+mSelection->HandleClick(pos.mResultContent, pos.mContentOffset,
+pos.mContentOffset, aExtend, false, aForward);
+if (limiter) {
+// HandleClick resets ancestorLimiter, so set it again.
+mSelection->SetAncestorLimiter(limiter);
+}
+// After ScrollSelectionIntoView(), the pending notifications might be
+// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
+return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
+nsISelectionController::SELECTION_FOCUS_REGION,
+nsISelectionController::SCROLL_SYNCHRONOUS);
+}
+NS_IMETHODIMP
+PresShell::SelectAll()
+{
+return mSelection->SelectAll();
+}
+static void
+DoCheckVisibility(nsPresContext* aPresContext,
+nsIContent* aNode,
+int16_t aStartOffset,
+int16_t aEndOffset,
+bool* aRetval)
+{
+nsIFrame* frame = aNode->GetPrimaryFrame();
+if (!frame) {
+// No frame to look at so it must not be visible.
+return;
+}
+// Start process now to go through all frames to find startOffset. Then check
+// chars after that to see if anything until EndOffset is visible.
+bool finished = false;
+frame->CheckVisibility(aPresContext, aStartOffset, aEndOffset, true,
+&finished, aRetval);
+// Don't worry about other return value.
+}
+NS_IMETHODIMP
+PresShell::CheckVisibility(nsIDOMNode *node, int16_t startOffset, int16_t EndOffset, bool *_retval)
+{
+if (!node || startOffset>EndOffset || !_retval || startOffset<0 || EndOffset<0)
+return NS_ERROR_INVALID_ARG;
+*_retval = false; //initialize return parameter
+nsCOMPtr<nsIContent> content(do_QueryInterface(node));
+if (!content)
+return NS_ERROR_FAILURE;
+DoCheckVisibility(mPresContext, content, startOffset, EndOffset, _retval);
+return NS_OK;
+}
+nsresult
+PresShell::CheckVisibilityContent(nsIContent* aNode, int16_t aStartOffset,
+int16_t aEndOffset, bool* aRetval)
+{
+if (!aNode || aStartOffset > aEndOffset || !aRetval ||
+aStartOffset < 0 || aEndOffset < 0) {
+return NS_ERROR_INVALID_ARG;
+}
+*aRetval = false;
+DoCheckVisibility(mPresContext, aNode, aStartOffset, aEndOffset, aRetval);
+return NS_OK;
+}
+//end implementations nsISelectionController
+nsIFrame*
+nsIPresShell::GetRootFrameExternal() const
+{
+return mFrameConstructor->GetRootFrame();
+}
+nsIFrame*
+nsIPresShell::GetRootScrollFrame() const
+{
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+// Ensure root frame is a viewport frame
+if (!rootFrame || nsGkAtoms::viewportFrame != rootFrame->GetType())
+return nullptr;
+nsIFrame* theFrame = rootFrame->GetFirstPrincipalChild();
+if (!theFrame || nsGkAtoms::scrollFrame != theFrame->GetType())
+return nullptr;
+return theFrame;
+}
+nsIScrollableFrame*
+nsIPresShell::GetRootScrollFrameAsScrollable() const
+{
+nsIFrame* frame = GetRootScrollFrame();
+if (!frame)
+return nullptr;
+nsIScrollableFrame* scrollableFrame = do_QueryFrame(frame);
+NS_ASSERTION(scrollableFrame,
+"All scroll frames must implement nsIScrollableFrame");
+return scrollableFrame;
+}
+nsIScrollableFrame*
+nsIPresShell::GetRootScrollFrameAsScrollableExternal() const
+{
+return GetRootScrollFrameAsScrollable();
+}
+nsIPageSequenceFrame*
+PresShell::GetPageSequenceFrame() const
+{
+nsIFrame* frame = mFrameConstructor->GetPageSequenceFrame();
+return do_QueryFrame(frame);
+}
+void
+PresShell::BeginUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
+{
+#ifdef DEBUG
+mUpdateCount++;
+#endif
+mFrameConstructor->BeginUpdate();
+if (aUpdateType & UPDATE_STYLE)
+mStyleSet->BeginUpdate();
+}
+void
+PresShell::EndUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
+{
+#ifdef DEBUG
+NS_PRECONDITION(0 != mUpdateCount, "too many EndUpdate's");
+--mUpdateCount;
+#endif
+if (aUpdateType & UPDATE_STYLE) {
+mStyleSet->EndUpdate();
+if (mStylesHaveChanged || !mChangedScopeStyleRoots.IsEmpty())
+ReconstructStyleData();
+}
+mFrameConstructor->EndUpdate();
+}
+void
+PresShell::RestoreRootScrollPosition()
+{
+nsIScrollableFrame* scrollableFrame = GetRootScrollFrameAsScrollable();
+if (scrollableFrame) {
+scrollableFrame->ScrollToRestoredPosition();
+}
+}
+void
+PresShell::BeginLoad(nsIDocument *aDocument)
+{
+mDocumentLoading = true;
+#ifdef PR_LOGGING
+gfxTextPerfMetrics *tp = nullptr;
+if (mPresContext) {
+tp = mPresContext->GetTextPerfMetrics();
+}
+bool shouldLog = gLog && PR_LOG_TEST(gLog, PR_LOG_DEBUG);
+if (shouldLog || tp) {
+mLoadBegin = TimeStamp::Now();
+}
+if (shouldLog) {
+nsIURI* uri = mDocument->GetDocumentURI();
+nsAutoCString spec;
+if (uri) {
+uri->GetSpec(spec);
+}
+PR_LOG(gLog, PR_LOG_DEBUG,
+("(presshell) %p load begin [%s]\n",
+this, spec.get()));
+}
+#endif
+}
+void
+PresShell::EndLoad(nsIDocument *aDocument)
+{
+NS_PRECONDITION(aDocument == mDocument, "Wrong document");
+RestoreRootScrollPosition();
+mDocumentLoading = false;
+}
+void
+PresShell::LoadComplete()
+{
+#ifdef PR_LOGGING
+gfxTextPerfMetrics *tp = nullptr;
+if (mPresContext) {
+tp = mPresContext->GetTextPerfMetrics();
+}
+// log load
+bool shouldLog = gLog && PR_LOG_TEST(gLog, PR_LOG_DEBUG);
+if (shouldLog || tp) {
+TimeDuration loadTime = TimeStamp::Now() - mLoadBegin;
+nsIURI* uri = mDocument->GetDocumentURI();
+nsAutoCString spec;
+if (uri) {
+uri->GetSpec(spec);
+}
+if (shouldLog) {
+PR_LOG(gLog, PR_LOG_DEBUG,
+("(presshell) %p load done time-ms: %9.2f [%s]\n",
+this, loadTime.ToMilliseconds(), spec.get()));
+}
+if (tp) {
+tp->Accumulate();
+if (tp->cumulative.numChars > 0) {
+LogTextPerfStats(tp, this, tp->cumulative, loadTime.ToMilliseconds(),
+eLog_loaddone, spec.get());
+}
+}
+}
+#endif
+}
+#ifdef DEBUG
+void
+PresShell::VerifyHasDirtyRootAncestor(nsIFrame* aFrame)
+{
+// XXXbz due to bug 372769, can't actually assert anything here...
+return;
+// XXXbz shouldn't need this part; remove it once FrameNeedsReflow
+// handles the root frame correctly.
+if (!aFrame->GetParent()) {
+return;
+}
+// Make sure that there is a reflow root ancestor of |aFrame| that's
+// in mDirtyRoots already.
+while (aFrame && (aFrame->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN)) {
+if (((aFrame->GetStateBits() & NS_FRAME_REFLOW_ROOT) ||
+!aFrame->GetParent()) &&
+mDirtyRoots.Contains(aFrame)) {
+return;
+}
+aFrame = aFrame->GetParent();
+}
+NS_NOTREACHED("Frame has dirty bits set but isn't scheduled to be "
+"reflowed?");
+}
+#endif
+void
+PresShell::FrameNeedsReflow(nsIFrame *aFrame, IntrinsicDirty aIntrinsicDirty,
+nsFrameState aBitToAdd)
+{
+NS_PRECONDITION(aBitToAdd == NS_FRAME_IS_DIRTY ||
+aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN ||
+!aBitToAdd,
+"Unexpected bits being added");
+NS_PRECONDITION(!(aIntrinsicDirty == eStyleChange &&
+aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN),
+"bits don't correspond to style change reason");
+NS_ASSERTION(!mIsReflowing, "can't mark frame dirty during reflow");
+// If we've not yet done the initial reflow, then don't bother
+// enqueuing a reflow command yet.
+if (! mDidInitialize)
+return;
+// If we're already destroying, don't bother with this either.
+if (mIsDestroying)
+return;
+#ifdef DEBUG
+//printf("gShellCounter: %d\n", gShellCounter++);
+if (mInVerifyReflow)
+return;
+if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
+printf("\nPresShell@%p: frame %p needs reflow\n", (void*)this, (void*)aFrame);
+if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
+printf("Current content model:\n");
+Element *rootElement = mDocument->GetRootElement();
+if (rootElement) {
+rootElement->List(stdout, 0);
+}
+}
+}
+#endif
+nsAutoTArray<nsIFrame*, 4> subtrees;
+subtrees.AppendElement(aFrame);
+do {
+nsIFrame *subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
+subtrees.RemoveElementAt(subtrees.Length() - 1);
+// Grab |wasDirty| now so we can go ahead and update the bits on
+// subtreeRoot.
+bool wasDirty = NS_SUBTREE_DIRTY(subtreeRoot);
+subtreeRoot->AddStateBits(aBitToAdd);
+// Now if subtreeRoot is a reflow root we can cut off this reflow at it if
+// the bit being added is NS_FRAME_HAS_DIRTY_CHILDREN.
+bool targetFrameDirty = (aBitToAdd == NS_FRAME_IS_DIRTY);
+#define FRAME_IS_REFLOW_ROOT(_f)                   \
+((_f->GetStateBits() & NS_FRAME_REFLOW_ROOT) &&  \
+(_f != subtreeRoot || !targetFrameDirty))
+// Mark the intrinsic widths as dirty on the frame, all of its ancestors,
+// and all of its descendants, if needed:
+if (aIntrinsicDirty != eResize) {
+// Mark argument and all ancestors dirty. (Unless we hit a reflow
+// root that should contain the reflow.  That root could be
+// subtreeRoot itself if it's not dirty, or it could be some
+// ancestor of subtreeRoot.)
+for (nsIFrame *a = subtreeRoot;
+a && !FRAME_IS_REFLOW_ROOT(a);
+a = a->GetParent())
+a->MarkIntrinsicWidthsDirty();
+}
+if (aIntrinsicDirty == eStyleChange) {
+// Mark all descendants dirty (using an nsTArray stack rather than
+// recursion).
+// Note that nsHTMLReflowState::InitResizeFlags has some similar
+// code; see comments there for how and why it differs.
+nsAutoTArray<nsIFrame*, 32> stack;
+stack.AppendElement(subtreeRoot);
+do {
+nsIFrame *f = stack.ElementAt(stack.Length() - 1);
+stack.RemoveElementAt(stack.Length() - 1);
+if (f->GetType() == nsGkAtoms::placeholderFrame) {
+nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
+if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
+// We have another distinct subtree we need to mark.
+subtrees.AppendElement(oof);
+}
+}
+nsIFrame::ChildListIterator lists(f);
+for (; !lists.IsDone(); lists.Next()) {
+nsFrameList::Enumerator childFrames(lists.CurrentList());
+for (; !childFrames.AtEnd(); childFrames.Next()) {
+nsIFrame* kid = childFrames.get();
+kid->MarkIntrinsicWidthsDirty();
+stack.AppendElement(kid);
+}
+}
+} while (stack.Length() != 0);
+}
+// Skip setting dirty bits up the tree if we weren't given a bit to add.
+if (!aBitToAdd) {
+continue;
+}
+// Set NS_FRAME_HAS_DIRTY_CHILDREN bits (via nsIFrame::ChildIsDirty)
+// up the tree until we reach either a frame that's already dirty or
+// a reflow root.
+nsIFrame *f = subtreeRoot;
+for (;;) {
+if (FRAME_IS_REFLOW_ROOT(f) || !f->GetParent()) {
+// we've hit a reflow root or the root frame
+if (!wasDirty) {
+mDirtyRoots.AppendElement(f);
+mDocument->SetNeedLayoutFlush();
+}
+#ifdef DEBUG
+else {
+VerifyHasDirtyRootAncestor(f);
+}
+#endif
+break;
+}
+nsIFrame *child = f;
+f = f->GetParent();
+wasDirty = NS_SUBTREE_DIRTY(f);
+f->ChildIsDirty(child);
+NS_ASSERTION(f->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN,
+"ChildIsDirty didn't do its job");
+if (wasDirty) {
+// This frame was already marked dirty.
+#ifdef DEBUG
+VerifyHasDirtyRootAncestor(f);
+#endif
+break;
+}
+}
+} while (subtrees.Length() != 0);
+MaybeScheduleReflow();
+}
+void
+PresShell::FrameNeedsToContinueReflow(nsIFrame *aFrame)
+{
+NS_ASSERTION(mIsReflowing, "Must be in reflow when marking path dirty.");
+NS_PRECONDITION(mCurrentReflowRoot, "Must have a current reflow root here");
+NS_ASSERTION(aFrame == mCurrentReflowRoot ||
+nsLayoutUtils::IsProperAncestorFrame(mCurrentReflowRoot, aFrame),
+"Frame passed in is not the descendant of mCurrentReflowRoot");
+NS_ASSERTION(aFrame->GetStateBits() & NS_FRAME_IN_REFLOW,
+"Frame passed in not in reflow?");
+mFramesToDirty.PutEntry(aFrame);
+}
+nsIScrollableFrame*
+nsIPresShell::GetFrameToScrollAsScrollable(
+nsIPresShell::ScrollDirection aDirection)
+{
+nsIScrollableFrame* scrollFrame = nullptr;
+nsCOMPtr<nsIContent> focusedContent;
+nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+if (fm && mDocument) {
+nsCOMPtr<nsIDOMWindow> window = do_QueryInterface(mDocument->GetWindow());
+nsCOMPtr<nsIDOMElement> focusedElement;
+fm->GetFocusedElementForWindow(window, false, nullptr, getter_AddRefs(focusedElement));
+focusedContent = do_QueryInterface(focusedElement);
+}
+if (!focusedContent && mSelection) {
+nsISelection* domSelection = mSelection->
+GetSelection(nsISelectionController::SELECTION_NORMAL);
+if (domSelection) {
+nsCOMPtr<nsIDOMNode> focusedNode;
+domSelection->GetFocusNode(getter_AddRefs(focusedNode));
+focusedContent = do_QueryInterface(focusedNode);
+}
+}
+if (focusedContent) {
+nsIFrame* startFrame = focusedContent->GetPrimaryFrame();
+if (startFrame) {
+scrollFrame = startFrame->GetScrollTargetFrame();
+if (scrollFrame) {
+startFrame = scrollFrame->GetScrolledFrame();
+}
+if (aDirection == nsIPresShell::eEither) {
+scrollFrame =
+nsLayoutUtils::GetNearestScrollableFrame(startFrame);
+} else {
+scrollFrame =
+nsLayoutUtils::GetNearestScrollableFrameForDirection(startFrame,
+aDirection == eVertical ? nsLayoutUtils::eVertical :
+nsLayoutUtils::eHorizontal);
+}
+}
+}
+if (!scrollFrame) {
+scrollFrame = GetRootScrollFrameAsScrollable();
+}
+return scrollFrame;
+}
+void
+PresShell::CancelAllPendingReflows()
+{
+mDirtyRoots.Clear();
+if (mReflowScheduled) {
+GetPresContext()->RefreshDriver()->RemoveLayoutFlushObserver(this);
+mReflowScheduled = false;
+}
+ASSERT_REFLOW_SCHEDULED_STATE();
+}
+nsresult
+PresShell::RecreateFramesFor(nsIContent* aContent)
+{
+NS_ENSURE_TRUE(mPresContext, NS_ERROR_FAILURE);
+if (!mDidInitialize) {
+// Nothing to do here.  In fact, if we proceed and aContent is the
+// root we will crash.
+return NS_OK;
+}
+// Don't call RecreateFramesForContent since that is not exported and we want
+// to keep the number of entrypoints down.
+NS_ASSERTION(mViewManager, "Should have view manager");
+// Have to make sure that the content notifications are flushed before we
+// start messing with the frame model; otherwise we can get content doubling.
+mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
+nsAutoScriptBlocker scriptBlocker;
+nsStyleChangeList changeList;
+changeList.AppendChange(nullptr, aContent, nsChangeHint_ReconstructFrame);
+// Mark ourselves as not safe to flush while we're doing frame construction.
+++mChangeNestCount;
+RestyleManager* restyleManager = mPresContext->RestyleManager();
+nsresult rv = restyleManager->ProcessRestyledFrames(changeList);
+restyleManager->FlushOverflowChangedTracker();
+--mChangeNestCount;
+return rv;
+}
+void
+nsIPresShell::PostRecreateFramesFor(Element* aElement)
+{
+mPresContext->RestyleManager()->PostRestyleEvent(aElement, nsRestyleHint(0),
+nsChangeHint_ReconstructFrame);
+}
+void
+nsIPresShell::RestyleForAnimation(Element* aElement, nsRestyleHint aHint)
+{
+mPresContext->RestyleManager()->PostAnimationRestyleEvent(aElement, aHint,
+NS_STYLE_HINT_NONE);
+}
+void
+nsIPresShell::SetForwardingContainer(const WeakPtr<nsDocShell> &aContainer)
+{
+mForwardingContainer = aContainer;
+}
+void
+PresShell::ClearFrameRefs(nsIFrame* aFrame)
+{
+mPresContext->EventStateManager()->ClearFrameRefs(aFrame);
+nsWeakFrame* weakFrame = mWeakFrames;
+while (weakFrame) {
+nsWeakFrame* prev = weakFrame->GetPreviousWeakFrame();
+if (weakFrame->GetFrame() == aFrame) {
+// This removes weakFrame from mWeakFrames.
+weakFrame->Clear(this);
+}
+weakFrame = prev;
+}
+}
+already_AddRefed<nsRenderingContext>
+PresShell::CreateReferenceRenderingContext()
+{
+nsDeviceContext* devCtx = mPresContext->DeviceContext();
+nsRefPtr<nsRenderingContext> rc;
+if (mPresContext->IsScreen()) {
+rc = new nsRenderingContext();
+rc->Init(devCtx, gfxPlatform::GetPlatform()->ScreenReferenceSurface());
+} else {
+rc = devCtx->CreateRenderingContext();
+}
+MOZ_ASSERT(rc, "shouldn't break promise to return non-null");
+return rc.forget();
+}
+nsresult
+PresShell::GoToAnchor(const nsAString& aAnchorName, bool aScroll)
+{
+if (!mDocument) {
+return NS_ERROR_FAILURE;
+}
+const Element *root = mDocument->GetRootElement();
+if (root && root->IsSVG(nsGkAtoms::svg)) {
+// We need to execute this even if there is an empty anchor name
+// so that any existing SVG fragment identifier effect is removed
+if (SVGFragmentIdentifier::ProcessFragmentIdentifier(mDocument, aAnchorName)) {
+return NS_OK;
+}
+}
+// Hold a reference to the ESM in case event dispatch tears us down.
+nsRefPtr<EventStateManager> esm = mPresContext->EventStateManager();
+if (aAnchorName.IsEmpty()) {
+NS_ASSERTION(!aScroll, "can't scroll to empty anchor name");
+esm->SetContentState(nullptr, NS_EVENT_STATE_URLTARGET);
+return NS_OK;
+}
+nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
+nsresult rv = NS_OK;
+nsCOMPtr<nsIContent> content;
+// Search for an element with a matching "id" attribute
+if (mDocument) {
+content = mDocument->GetElementById(aAnchorName);
+}
+// Search for an anchor element with a matching "name" attribute
+if (!content && htmlDoc) {
+nsCOMPtr<nsIDOMNodeList> list;
+// Find a matching list of named nodes
+rv = htmlDoc->GetElementsByName(aAnchorName, getter_AddRefs(list));
+if (NS_SUCCEEDED(rv) && list) {
+uint32_t i;
+// Loop through the named nodes looking for the first anchor
+for (i = 0; true; i++) {
+nsCOMPtr<nsIDOMNode> node;
+rv = list->Item(i, getter_AddRefs(node));
+if (!node) {  // End of list
+break;
+}
+// Ensure it's an anchor element
+content = do_QueryInterface(node);
+if (content) {
+if (content->Tag() == nsGkAtoms::a && content->IsHTML()) {
+break;
+}
+content = nullptr;
+}
+}
+}
+}
+// Search for anchor in the HTML namespace with a matching name
+if (!content && !htmlDoc)
+{
+nsCOMPtr<nsIDOMDocument> doc = do_QueryInterface(mDocument);
+nsCOMPtr<nsIDOMNodeList> list;
+NS_NAMED_LITERAL_STRING(nameSpace, "http://www.w3.org/1999/xhtml");
+// Get the list of anchor elements
+rv = doc->GetElementsByTagNameNS(nameSpace, NS_LITERAL_STRING("a"), getter_AddRefs(list));
+if (NS_SUCCEEDED(rv) && list) {
+uint32_t i;
+// Loop through the named nodes looking for the first anchor
+for (i = 0; true; i++) {
+nsCOMPtr<nsIDOMNode> node;
+rv = list->Item(i, getter_AddRefs(node));
+if (!node) { // End of list
+break;
+}
+// Compare the name attribute
+nsCOMPtr<nsIDOMElement> element = do_QueryInterface(node);
+nsAutoString value;
+if (element && NS_SUCCEEDED(element->GetAttribute(NS_LITERAL_STRING("name"), value))) {
+if (value.Equals(aAnchorName)) {
+content = do_QueryInterface(element);
+break;
+}
+}
+}
+}
+}
+esm->SetContentState(content, NS_EVENT_STATE_URLTARGET);
+#ifdef ACCESSIBILITY
+nsIContent *anchorTarget = content;
+#endif
+nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
+if (rootScroll && rootScroll->DidHistoryRestore()) {
+// Scroll position restored from history trumps scrolling to anchor.
+aScroll = false;
+rootScroll->ClearDidHistoryRestore();
+}
+if (content) {
+if (aScroll) {
+rv = ScrollContentIntoView(content,
+ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
+ScrollAxis(),
+ANCHOR_SCROLL_FLAGS);
+NS_ENSURE_SUCCESS(rv, rv);
+nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
+if (rootScroll) {
+mLastAnchorScrolledTo = content;
+mLastAnchorScrollPositionY = rootScroll->GetScrollPosition().y;
+}
+}
+// Should we select the target? This action is controlled by a
+// preference: the default is to not select.
+bool selectAnchor = Preferences::GetBool("layout.selectanchor");
+// Even if select anchor pref is false, we must still move the
+// caret there. That way tabbing will start from the new
+// location
+nsRefPtr<nsIDOMRange> jumpToRange = new nsRange(mDocument);
+while (content && content->GetFirstChild()) {
+content = content->GetFirstChild();
+}
+nsCOMPtr<nsIDOMNode> node(do_QueryInterface(content));
+NS_ASSERTION(node, "No nsIDOMNode for descendant of anchor");
+jumpToRange->SelectNodeContents(node);
+// Select the anchor
+nsISelection* sel = mSelection->
+GetSelection(nsISelectionController::SELECTION_NORMAL);
+if (sel) {
+sel->RemoveAllRanges();
+sel->AddRange(jumpToRange);
+if (!selectAnchor) {
+// Use a caret (collapsed selection) at the start of the anchor
+sel->CollapseToStart();
+}
+}
+// Selection is at anchor.
+// Now focus the document itself if focus is on an element within it.
+nsPIDOMWindow *win = mDocument->GetWindow();
+nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+if (fm && win) {
+nsCOMPtr<nsIDOMWindow> focusedWindow;
+fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
+if (SameCOMIdentity(win, focusedWindow)) {
+fm->ClearFocus(focusedWindow);
+}
+}
+// If the target is an animation element, activate the animation
+if (content->IsNodeOfType(nsINode::eANIMATION)) {
+SVGContentUtils::ActivateByHyperlink(content.get());
+}
+} else {
+rv = NS_ERROR_FAILURE;
+NS_NAMED_LITERAL_STRING(top, "top");
+if (nsContentUtils::EqualsIgnoreASCIICase(aAnchorName, top)) {
+// Scroll to the top/left if aAnchorName is "top" and there is no element
+// with such a name or id.
+rv = NS_OK;
+nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
+// Check |aScroll| after setting |rv| so we set |rv| to the same
+// thing whether or not |aScroll| is true.
+if (aScroll && sf) {
+// Scroll to the top of the page
+sf->ScrollTo(nsPoint(0, 0), nsIScrollableFrame::INSTANT);
+}
+}
+}
+#ifdef ACCESSIBILITY
+if (anchorTarget) {
+nsAccessibilityService* accService = AccService();
+if (accService)
+accService->NotifyOfAnchorJumpTo(anchorTarget);
+}
+#endif
+return rv;
+}
+nsresult
+PresShell::ScrollToAnchor()
+{
+if (!mLastAnchorScrolledTo) {
+return NS_OK;
+}
+NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
+nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
+if (!rootScroll ||
+mLastAnchorScrollPositionY != rootScroll->GetScrollPosition().y) {
+return NS_OK;
+}
+nsresult rv = ScrollContentIntoView(mLastAnchorScrolledTo,
+ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
+ScrollAxis(),
+ANCHOR_SCROLL_FLAGS);
+mLastAnchorScrolledTo = nullptr;
+return rv;
+}
+/*
+* Helper (per-continuation) for ScrollContentIntoView.
+*
+* @param aContainerFrame [in] the frame which aRect is relative to
+* @param aFrame [in] Frame whose bounds should be unioned
+* @param aUseWholeLineHeightForInlines [in] if true, then for inline frames
+* we should include the top of the line in the added rectangle
+* @param aRect [inout] rect into which its bounds should be unioned
+* @param aHaveRect [inout] whether aRect contains data yet
+* @param aPrevBlock [inout] the block aLines is a line iterator for
+* @param aLines [inout] the line iterator we're using
+* @param aCurLine [inout] the line to start looking from in this iterator
+*/
+static void
+AccumulateFrameBounds(nsIFrame* aContainerFrame,
+nsIFrame* aFrame,
+bool aUseWholeLineHeightForInlines,
+nsRect& aRect,
+bool& aHaveRect,
+nsIFrame*& aPrevBlock,
+nsAutoLineIterator& aLines,
+int32_t& aCurLine)
+{
+nsIFrame* frame = aFrame;
+nsRect frameBounds = nsRect(nsPoint(0, 0), aFrame->GetSize());
+// If this is an inline frame and either the bounds height is 0 (quirks
+// layout model) or aUseWholeLineHeightForInlines is set, we need to
+// change the top of the bounds to include the whole line.
+if (frameBounds.height == 0 || aUseWholeLineHeightForInlines) {
+nsIFrame *prevFrame = aFrame;
+nsIFrame *f = aFrame;
+while (f && f->IsFrameOfType(nsIFrame::eLineParticipant) &&
+!f->IsTransformed() && !f->IsPositioned()) {
+prevFrame = f;
+f = prevFrame->GetParent();
+}
+if (f != aFrame &&
+f &&
+f->GetType() == nsGkAtoms::blockFrame) {
+// find the line containing aFrame and increase the top of |offset|.
+if (f != aPrevBlock) {
+aLines = f->GetLineIterator();
+aPrevBlock = f;
+aCurLine = 0;
+}
+if (aLines) {
+int32_t index = aLines->FindLineContaining(prevFrame, aCurLine);
+if (index >= 0) {
+aCurLine = index;
+nsIFrame *trash1;
+int32_t trash2;
+nsRect lineBounds;
+uint32_t trash3;
+if (NS_SUCCEEDED(aLines->GetLine(index, &trash1, &trash2,
+lineBounds, &trash3))) {
+frameBounds += frame->GetOffsetTo(f);
+frame = f;
+if (lineBounds.y < frameBounds.y) {
+frameBounds.height = frameBounds.YMost() - lineBounds.y;
+frameBounds.y = lineBounds.y;
+}
+}
+}
+}
+}
+}
+nsRect transformedBounds = nsLayoutUtils::TransformFrameRectToAncestor(frame,
+frameBounds, aContainerFrame);
+if (aHaveRect) {
+// We can't use nsRect::UnionRect since it drops empty rects on
+// the floor, and we need to include them.  (Thus we need
+// aHaveRect to know when to drop the initial value on the floor.)
+aRect.UnionRectEdges(aRect, transformedBounds);
+} else {
+aHaveRect = true;
+aRect = transformedBounds;
+}
+}
+static bool
+ComputeNeedToScroll(nsIPresShell::WhenToScroll aWhenToScroll,
+nscoord                    aLineSize,
+nscoord                    aRectMin,
+nscoord                    aRectMax,
+nscoord                    aViewMin,
+nscoord                    aViewMax) {
+// See how the rect should be positioned vertically
+if (nsIPresShell::SCROLL_ALWAYS == aWhenToScroll) {
+// The caller wants the frame as visible as possible
+return true;
+} else if (nsIPresShell::SCROLL_IF_NOT_VISIBLE == aWhenToScroll) {
+// Scroll only if no part of the frame is visible in this view
+return aRectMax - aLineSize <= aViewMin ||
+aRectMin + aLineSize >= aViewMax;
+} else if (nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE == aWhenToScroll) {
+// Scroll only if part of the frame is hidden and more can fit in view
+return !(aRectMin >= aViewMin && aRectMax <= aViewMax) &&
+std::min(aViewMax, aRectMax) - std::max(aRectMin, aViewMin) < aViewMax - aViewMin;
+}
+return false;
+}
+static nscoord
+ComputeWhereToScroll(int16_t aWhereToScroll,
+nscoord aOriginalCoord,
+nscoord aRectMin,
+nscoord aRectMax,
+nscoord aViewMin,
+nscoord aViewMax,
+nscoord* aRangeMin,
+nscoord* aRangeMax) {
+nscoord resultCoord = aOriginalCoord;
+// Allow the scroll operation to land anywhere that
+// makes the whole rectangle visible.
+if (nsIPresShell::SCROLL_MINIMUM == aWhereToScroll) {
+if (aRectMin < aViewMin) {
+// Scroll up so the frame's top edge is visible
+resultCoord = aRectMin;
+} else if (aRectMax > aViewMax) {
+// Scroll down so the frame's bottom edge is visible. Make sure the
+// frame's top edge is still visible
+resultCoord = aOriginalCoord + aRectMax - aViewMax;
+if (resultCoord > aRectMin) {
+resultCoord = aRectMin;
+}
+}
+} else {
+nscoord frameAlignCoord =
+NSToCoordRound(aRectMin + (aRectMax - aRectMin) * (aWhereToScroll / 100.0f));
+resultCoord =  NSToCoordRound(frameAlignCoord - (aViewMax - aViewMin) * (
+aWhereToScroll / 100.0f));
+}
+nscoord scrollPortLength = aViewMax - aViewMin;
+// Force the scroll range to extend to include resultCoord.
+*aRangeMin = std::min(resultCoord, aRectMax - scrollPortLength);
+*aRangeMax = std::max(resultCoord, aRectMin);
+return resultCoord;
+}
+/**
+* This function takes a scrollable frame, a rect in the coordinate system
+* of the scrolled frame, and a desired percentage-based scroll
+* position and attempts to scroll the rect to that position in the
+* scrollport.
+*
+* This needs to work even if aRect has a width or height of zero.
+*/
+static void ScrollToShowRect(nsIFrame*                aFrame,
+nsIScrollableFrame*      aFrameAsScrollable,
+const nsRect&            aRect,
+nsIPresShell::ScrollAxis aVertical,
+nsIPresShell::ScrollAxis aHorizontal,
+uint32_t                 aFlags)
+{
+nsPoint scrollPt = aFrameAsScrollable->GetScrollPosition();
+nsRect visibleRect(scrollPt,
+aFrameAsScrollable->GetScrollPositionClampingScrollPortSize());
+// If this is the root scroll frame, make sure to take into account the
+// content document fixed position margins. When set, these indicate that
+// chrome is obscuring the viewport.
+nsRect targetRect(aRect);
+nsIPresShell *presShell = aFrame->PresContext()->PresShell();
+if (aFrameAsScrollable == presShell->GetRootScrollFrameAsScrollable()) {
+targetRect.Inflate(presShell->GetContentDocumentFixedPositionMargins());
+}
+nsSize lineSize;
+// Don't call GetLineScrollAmount unless we actually need it. Not only
+// does this save time, but it's not safe to call GetLineScrollAmount
+// during reflow (because it depends on font size inflation and doesn't
+// use the in-reflow-safe font-size inflation path). If we did call it,
+// it would assert and possible give the wrong result.
+if (aVertical.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE ||
+aHorizontal.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE) {
+lineSize = aFrameAsScrollable->GetLineScrollAmount();
+}
+ScrollbarStyles ss = aFrameAsScrollable->GetScrollbarStyles();
+nsRect allowedRange(scrollPt, nsSize(0, 0));
+bool needToScroll = false;
+uint32_t directions = aFrameAsScrollable->GetPerceivedScrollingDirections();
+if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
+ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN) &&
+(!aVertical.mOnlyIfPerceivedScrollableDirection ||
+(directions & nsIScrollableFrame::VERTICAL))) {
+if (ComputeNeedToScroll(aVertical.mWhenToScroll,
+lineSize.height,
+targetRect.y,
+targetRect.YMost(),
+visibleRect.y,
+visibleRect.YMost())) {
+nscoord maxHeight;
+scrollPt.y = ComputeWhereToScroll(aVertical.mWhereToScroll,
+scrollPt.y,
+targetRect.y,
+targetRect.YMost(),
+visibleRect.y,
+visibleRect.YMost(),
+&allowedRange.y, &maxHeight);
+allowedRange.height = maxHeight - allowedRange.y;
+needToScroll = true;
+}
+}
+if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
+ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) &&
+(!aHorizontal.mOnlyIfPerceivedScrollableDirection ||
+(directions & nsIScrollableFrame::HORIZONTAL))) {
+if (ComputeNeedToScroll(aHorizontal.mWhenToScroll,
+lineSize.width,
+targetRect.x,
+targetRect.XMost(),
+visibleRect.x,
+visibleRect.XMost())) {
+nscoord maxWidth;
+scrollPt.x = ComputeWhereToScroll(aHorizontal.mWhereToScroll,
+scrollPt.x,
+targetRect.x,
+targetRect.XMost(),
+visibleRect.x,
+visibleRect.XMost(),
+&allowedRange.x, &maxWidth);
+allowedRange.width = maxWidth - allowedRange.x;
+needToScroll = true;
+}
+}
+// If we don't need to scroll, then don't try since it might cancel
+// a current smooth scroll operation.
+if (needToScroll) {
+aFrameAsScrollable->ScrollTo(scrollPt, nsIScrollableFrame::INSTANT, &allowedRange);
+}
+}
+nsresult
+PresShell::ScrollContentIntoView(nsIContent*              aContent,
+nsIPresShell::ScrollAxis aVertical,
+nsIPresShell::ScrollAxis aHorizontal,
+uint32_t                 aFlags)
+{
+NS_ENSURE_TRUE(aContent, NS_ERROR_NULL_POINTER);
+nsCOMPtr<nsIDocument> currentDoc = aContent->GetCurrentDoc();
+NS_ENSURE_STATE(currentDoc);
+NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
+if (mContentToScrollTo) {
+mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
+}
+mContentToScrollTo = aContent;
+ScrollIntoViewData* data = new ScrollIntoViewData();
+data->mContentScrollVAxis = aVertical;
+data->mContentScrollHAxis = aHorizontal;
+data->mContentToScrollToFlags = aFlags;
+if (NS_FAILED(mContentToScrollTo->SetProperty(nsGkAtoms::scrolling, data,
+nsINode::DeleteProperty<PresShell::ScrollIntoViewData>))) {
+mContentToScrollTo = nullptr;
+}
+// Flush layout and attempt to scroll in the process.
+currentDoc->SetNeedLayoutFlush();
+currentDoc->FlushPendingNotifications(Flush_InterruptibleLayout);
+// If mContentToScrollTo is non-null, that means we interrupted the reflow
+// (or suppressed it altogether because we're suppressing interruptible
+// flushes right now) and won't necessarily get the position correct, but do
+// a best-effort scroll here.  The other option would be to do this inside
+// FlushPendingNotifications, but I'm not sure the repeated scrolling that
+// could trigger if reflows keep getting interrupted would be more desirable
+// than a single best-effort scroll followed by one final scroll on the first
+// completed reflow.
+if (mContentToScrollTo) {
+DoScrollContentIntoView();
+}
+return NS_OK;
+}
+void
+PresShell::DoScrollContentIntoView()
+{
+NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
+nsIFrame* frame = mContentToScrollTo->GetPrimaryFrame();
+if (!frame) {
+mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
+mContentToScrollTo = nullptr;
+return;
+}
+if (frame->GetStateBits() & NS_FRAME_FIRST_REFLOW) {
+// The reflow flush before this scroll got interrupted, and this frame's
+// coords and size are all zero, and it has no content showing anyway.
+// Don't bother scrolling to it.  We'll try again when we finish up layout.
+return;
+}
+// Make sure we skip 'frame' ... if it's scrollable, we should use its
+// scrollable ancestor as the container.
+nsIFrame* container =
+nsLayoutUtils::GetClosestFrameOfType(frame->GetParent(), nsGkAtoms::scrollFrame);
+if (!container) {
+// nothing can be scrolled
+return;
+}
+ScrollIntoViewData* data = static_cast<ScrollIntoViewData*>(
+mContentToScrollTo->GetProperty(nsGkAtoms::scrolling));
+if (MOZ_UNLIKELY(!data)) {
+mContentToScrollTo = nullptr;
+return;
+}
+// This is a two-step process.
+// Step 1: Find the bounds of the rect we want to scroll into view.  For
+//         example, for an inline frame we may want to scroll in the whole
+//         line, or we may want to scroll multiple lines into view.
+// Step 2: Walk container frame and its ancestors and scroll them
+//         appropriately.
+// frameBounds is relative to container. We're assuming
+// that scrollframes don't split so every continuation of frame will
+// be a descendant of container. (Things would still mostly work
+// even if that assumption was false.)
+nsRect frameBounds;
+bool haveRect = false;
+bool useWholeLineHeightForInlines =
+data->mContentScrollVAxis.mWhenToScroll != nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE;
+// Reuse the same line iterator across calls to AccumulateFrameBounds.  We set
+// it every time we detect a new block (stored in prevBlock).
+nsIFrame* prevBlock = nullptr;
+nsAutoLineIterator lines;
+// The last line we found a continuation on in |lines|.  We assume that later
+// continuations cannot come on earlier lines.
+int32_t curLine = 0;
+do {
+AccumulateFrameBounds(container, frame, useWholeLineHeightForInlines,
+frameBounds, haveRect, prevBlock, lines, curLine);
+} while ((frame = frame->GetNextContinuation()));
+ScrollFrameRectIntoView(container, frameBounds, data->mContentScrollVAxis,
+data->mContentScrollHAxis,
+data->mContentToScrollToFlags);
+}
+bool
+PresShell::ScrollFrameRectIntoView(nsIFrame*                aFrame,
+const nsRect&            aRect,
+nsIPresShell::ScrollAxis aVertical,
+nsIPresShell::ScrollAxis aHorizontal,
+uint32_t                 aFlags)
+{
+bool didScroll = false;
+// This function needs to work even if rect has a width or height of 0.
+nsRect rect = aRect;
+nsIFrame* container = aFrame;
+// Walk up the frame hierarchy scrolling the rect into view and
+// keeping rect relative to container
+do {
+nsIScrollableFrame* sf = do_QueryFrame(container);
+if (sf) {
+nsPoint oldPosition = sf->GetScrollPosition();
+nsRect targetRect = rect;
+if (container->StyleDisplay()->mOverflowClipBox ==
+NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX) {
+nsMargin padding = container->GetUsedPadding();
+targetRect.Inflate(padding);
+}
+ScrollToShowRect(container, sf, targetRect - sf->GetScrolledFrame()->GetPosition(),
+aVertical, aHorizontal, aFlags);
+nsPoint newPosition = sf->GetScrollPosition();
+// If the scroll position increased, that means our content moved up,
+// so our rect's offset should decrease
+rect += oldPosition - newPosition;
+if (oldPosition != newPosition) {
+didScroll = true;
+}
+// only scroll one container when this flag is set
+if (aFlags & nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY) {
+break;
+}
+}
+nsIFrame* parent;
+if (container->IsTransformed()) {
+container->GetTransformMatrix(nullptr, &parent);
+rect = nsLayoutUtils::TransformFrameRectToAncestor(container, rect, parent);
+} else {
+rect += container->GetPosition();
+parent = container->GetParent();
+}
+if (!parent && !(aFlags & nsIPresShell::SCROLL_NO_PARENT_FRAMES)) {
+nsPoint extraOffset(0,0);
+parent = nsLayoutUtils::GetCrossDocParentFrame(container, &extraOffset);
+if (parent) {
+int32_t APD = container->PresContext()->AppUnitsPerDevPixel();
+int32_t parentAPD = parent->PresContext()->AppUnitsPerDevPixel();
+rect = rect.ConvertAppUnitsRoundOut(APD, parentAPD);
+rect += extraOffset;
+}
+}
+container = parent;
+} while (container);
+return didScroll;
+}
+nsRectVisibility
+PresShell::GetRectVisibility(nsIFrame* aFrame,
+const nsRect &aRect,
+nscoord aMinTwips) const
+{
+NS_ASSERTION(aFrame->PresContext() == GetPresContext(),
+"prescontext mismatch?");
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+NS_ASSERTION(rootFrame,
+"How can someone have a frame for this presshell when there's no root?");
+nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
+nsRect scrollPortRect;
+if (sf) {
+scrollPortRect = sf->GetScrollPortRect();
+nsIFrame* f = do_QueryFrame(sf);
+scrollPortRect += f->GetOffsetTo(rootFrame);
+} else {
+scrollPortRect = nsRect(nsPoint(0,0), rootFrame->GetSize());
+}
+nsRect r = aRect + aFrame->GetOffsetTo(rootFrame);
+// If aRect is entirely visible then we don't need to ensure that
+// at least aMinTwips of it is visible
+if (scrollPortRect.Contains(r))
+return nsRectVisibility_kVisible;
+nsRect insetRect = scrollPortRect;
+insetRect.Deflate(aMinTwips, aMinTwips);
+if (r.YMost() <= insetRect.y)
+return nsRectVisibility_kAboveViewport;
+if (r.y >= insetRect.YMost())
+return nsRectVisibility_kBelowViewport;
+if (r.XMost() <= insetRect.x)
+return nsRectVisibility_kLeftOfViewport;
+if (r.x >= insetRect.XMost())
+return nsRectVisibility_kRightOfViewport;
+return nsRectVisibility_kVisible;
+}
+class PaintTimerCallBack MOZ_FINAL : public nsITimerCallback
+{
+public:
+PaintTimerCallBack(PresShell* aShell) : mShell(aShell) {}
+NS_DECL_ISUPPORTS
+NS_IMETHODIMP Notify(nsITimer* aTimer) MOZ_FINAL
+{
+mShell->SetNextPaintCompressed();
+mShell->AddInvalidateHiddenPresShellObserver(mShell->GetPresContext()->RefreshDriver());
+mShell->ScheduleViewManagerFlush();
+return NS_OK;
+}
+private:
+PresShell* mShell;
+};
+NS_IMPL_ISUPPORTS(PaintTimerCallBack, nsITimerCallback)
+void
+PresShell::ScheduleViewManagerFlush(PaintType aType)
+{
+if (aType == PAINT_DELAYED_COMPRESS) {
+// Delay paint for 1 second.
+static const uint32_t kPaintDelayPeriod = 1000;
+if (!mDelayedPaintTimer) {
+mDelayedPaintTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
+nsRefPtr<PaintTimerCallBack> cb = new PaintTimerCallBack(this);
+mDelayedPaintTimer->InitWithCallback(cb, kPaintDelayPeriod, nsITimer::TYPE_ONE_SHOT);
+}
+return;
+}
+nsPresContext* presContext = GetPresContext();
+if (presContext) {
+presContext->RefreshDriver()->ScheduleViewManagerFlush();
+}
+if (mDocument) {
+mDocument->SetNeedLayoutFlush();
+}
+}
+void
+PresShell::DispatchSynthMouseMove(WidgetGUIEvent* aEvent,
+bool aFlushOnHoverChange)
+{
+RestyleManager* restyleManager = mPresContext->RestyleManager();
+uint32_t hoverGenerationBefore = restyleManager->GetHoverGeneration();
+nsEventStatus status;
+nsView* targetView = nsView::GetViewFor(aEvent->widget);
+if (!targetView)
+return;
+targetView->GetViewManager()->DispatchEvent(aEvent, targetView, &status);
+if (MOZ_UNLIKELY(mIsDestroying)) {
+return;
+}
+if (aFlushOnHoverChange &&
+hoverGenerationBefore != restyleManager->GetHoverGeneration()) {
+// Flush so that the resulting reflow happens now so that our caller
+// can suppress any synthesized mouse moves caused by that reflow.
+FlushPendingNotifications(Flush_Layout);
+}
+}
+void
+PresShell::ClearMouseCaptureOnView(nsView* aView)
+{
+if (gCaptureInfo.mContent) {
+if (aView) {
+// if a view was specified, ensure that the captured content is within
+// this view.
+nsIFrame* frame = gCaptureInfo.mContent->GetPrimaryFrame();
+if (frame) {
+nsView* view = frame->GetClosestView();
+// if there is no view, capturing won't be handled any more, so
+// just release the capture.
+if (view) {
+do {
+if (view == aView) {
+NS_RELEASE(gCaptureInfo.mContent);
+// the view containing the captured content likely disappeared so
+// disable capture for now.
+gCaptureInfo.mAllowed = false;
+break;
+}
+view = view->GetParent();
+} while (view);
+// return if the view wasn't found
+return;
+}
+}
+}
+NS_RELEASE(gCaptureInfo.mContent);
+}
+// disable mouse capture until the next mousedown as a dialog has opened
+// or a drag has started. Otherwise, someone could start capture during
+// the modal dialog or drag.
+gCaptureInfo.mAllowed = false;
+}
+void
+nsIPresShell::ClearMouseCapture(nsIFrame* aFrame)
+{
+if (!gCaptureInfo.mContent) {
+gCaptureInfo.mAllowed = false;
+return;
+}
+// null frame argument means clear the capture
+if (!aFrame) {
+NS_RELEASE(gCaptureInfo.mContent);
+gCaptureInfo.mAllowed = false;
+return;
+}
+nsIFrame* capturingFrame = gCaptureInfo.mContent->GetPrimaryFrame();
+if (!capturingFrame) {
+NS_RELEASE(gCaptureInfo.mContent);
+gCaptureInfo.mAllowed = false;
+return;
+}
+if (nsLayoutUtils::IsAncestorFrameCrossDoc(aFrame, capturingFrame)) {
+NS_RELEASE(gCaptureInfo.mContent);
+gCaptureInfo.mAllowed = false;
+}
+}
+nsresult
+PresShell::CaptureHistoryState(nsILayoutHistoryState** aState)
+{
+NS_PRECONDITION(nullptr != aState, "null state pointer");
+// We actually have to mess with the docshell here, since we want to
+// store the state back in it.
+// XXXbz this isn't really right, since this is being called in the
+// content viewer's Hide() method...  by that point the docshell's
+// state could be wrong.  We should sort out a better ownership
+// model for the layout history state.
+nsCOMPtr<nsIDocShell> docShell(mPresContext->GetDocShell());
+if (!docShell)
+return NS_ERROR_FAILURE;
+nsCOMPtr<nsILayoutHistoryState> historyState;
+docShell->GetLayoutHistoryState(getter_AddRefs(historyState));
+if (!historyState) {
+// Create the document state object
+historyState = NS_NewLayoutHistoryState();
+docShell->SetLayoutHistoryState(historyState);
+}
+*aState = historyState;
+NS_IF_ADDREF(*aState);
+// Capture frame state for the entire frame hierarchy
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+if (!rootFrame) return NS_OK;
+mFrameConstructor->CaptureFrameState(rootFrame, historyState);
+return NS_OK;
+}
+void
+PresShell::UnsuppressAndInvalidate()
+{
+// Note: We ignore the EnsureVisible check for resource documents, because
+// they won't have a docshell, so they'll always fail EnsureVisible.
+if ((!mDocument->IsResourceDoc() && !mPresContext->EnsureVisible()) ||
+mHaveShutDown) {
+// No point; we're about to be torn down anyway.
+return;
+}
+if (!mDocument->IsResourceDoc()) {
+// Notify observers that a new page is about to be drawn. Execute this
+// as soon as it is safe to run JS, which is guaranteed to be before we
+// go back to the event loop and actually draw the page.
+nsContentUtils::AddScriptRunner(new nsBeforeFirstPaintDispatcher(mDocument));
+}
+mPaintingSuppressed = false;
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+if (rootFrame) {
+// let's assume that outline on a root frame is not supported
+rootFrame->InvalidateFrame();
+if (mCaretEnabled && mCaret) {
+mCaret->CheckCaretDrawingState();
+}
+}
+// now that painting is unsuppressed, focus may be set on the document
+nsPIDOMWindow *win = mDocument->GetWindow();
+if (win)
+win->SetReadyForFocus();
+if (!mHaveShutDown) {
+SynthesizeMouseMove(false);
+ScheduleImageVisibilityUpdate();
+}
+}
+void
+PresShell::UnsuppressPainting()
+{
+if (mPaintSuppressionTimer) {
+mPaintSuppressionTimer->Cancel();
+mPaintSuppressionTimer = nullptr;
+}
+if (mIsDocumentGone || !mPaintingSuppressed)
+return;
+// If we have reflows pending, just wait until we process
+// the reflows and get all the frames where we want them
+// before actually unlocking the painting.  Otherwise
+// go ahead and unlock now.
+if (!mDirtyRoots.IsEmpty())
+mShouldUnsuppressPainting = true;
+else
+UnsuppressAndInvalidate();
+}
+// Post a request to handle an arbitrary callback after reflow has finished.
+nsresult
+PresShell::PostReflowCallback(nsIReflowCallback* aCallback)
+{
+void* result = AllocateMisc(sizeof(nsCallbackEventRequest));
+nsCallbackEventRequest* request = (nsCallbackEventRequest*)result;
+request->callback = aCallback;
+request->next = nullptr;
+if (mLastCallbackEventRequest) {
+mLastCallbackEventRequest = mLastCallbackEventRequest->next = request;
+} else {
+mFirstCallbackEventRequest = request;
+mLastCallbackEventRequest = request;
+}
+return NS_OK;
+}
+void
+PresShell::CancelReflowCallback(nsIReflowCallback* aCallback)
+{
+nsCallbackEventRequest* before = nullptr;
+nsCallbackEventRequest* node = mFirstCallbackEventRequest;
+while(node)
+{
+nsIReflowCallback* callback = node->callback;
+if (callback == aCallback)
+{
+nsCallbackEventRequest* toFree = node;
+if (node == mFirstCallbackEventRequest) {
+node = node->next;
+mFirstCallbackEventRequest = node;
+NS_ASSERTION(before == nullptr, "impossible");
+} else {
+node = node->next;
+before->next = node;
+}
+if (toFree == mLastCallbackEventRequest) {
+mLastCallbackEventRequest = before;
+}
+FreeMisc(sizeof(nsCallbackEventRequest), toFree);
+} else {
+before = node;
+node = node->next;
+}
+}
+}
+void
+PresShell::CancelPostedReflowCallbacks()
+{
+while (mFirstCallbackEventRequest) {
+nsCallbackEventRequest* node = mFirstCallbackEventRequest;
+mFirstCallbackEventRequest = node->next;
+if (!mFirstCallbackEventRequest) {
+mLastCallbackEventRequest = nullptr;
+}
+nsIReflowCallback* callback = node->callback;
+FreeMisc(sizeof(nsCallbackEventRequest), node);
+if (callback) {
+callback->ReflowCallbackCanceled();
+}
+}
+}
+void
+PresShell::HandlePostedReflowCallbacks(bool aInterruptible)
+{
+bool shouldFlush = false;
+while (mFirstCallbackEventRequest) {
+nsCallbackEventRequest* node = mFirstCallbackEventRequest;
+mFirstCallbackEventRequest = node->next;
+if (!mFirstCallbackEventRequest) {
+mLastCallbackEventRequest = nullptr;
+}
+nsIReflowCallback* callback = node->callback;
+FreeMisc(sizeof(nsCallbackEventRequest), node);
+if (callback) {
+if (callback->ReflowFinished()) {
+shouldFlush = true;
+}
+}
+}
+mozFlushType flushType =
+aInterruptible ? Flush_InterruptibleLayout : Flush_Layout;
+if (shouldFlush && !mIsDestroying) {
+FlushPendingNotifications(flushType);
+}
+}
+bool
+PresShell::IsSafeToFlush() const
+{
+// Not safe if we are reflowing or in the middle of frame construction
+bool isSafeToFlush = !mIsReflowing &&
+!mChangeNestCount;
+if (isSafeToFlush) {
+// Not safe if we are painting
+nsViewManager* viewManager = GetViewManager();
+if (viewManager) {
+bool isPainting = false;
+viewManager->IsPainting(isPainting);
+if (isPainting) {
+isSafeToFlush = false;
+}
+}
+}
+return isSafeToFlush;
+}
+void
+PresShell::FlushPendingNotifications(mozFlushType aType)
+{
+// by default, flush animations if aType >= Flush_Style
+mozilla::ChangesToFlush flush(aType, aType >= Flush_Style);
+FlushPendingNotifications(flush);
+}
+void
+PresShell::FlushPendingNotifications(mozilla::ChangesToFlush aFlush)
+{
+if (mIsZombie) {
+return;
+}
+/**
+* VERY IMPORTANT: If you add some sort of new flushing to this
+* method, make sure to add the relevant SetNeedLayoutFlush or
+* SetNeedStyleFlush calls on the document.
+*/
+mozFlushType flushType = aFlush.mFlushType;
+#ifdef MOZ_ENABLE_PROFILER_SPS
+static const char flushTypeNames[][20] = {
+"Content",
+"ContentAndNotify",
+"Style",
+"InterruptibleLayout",
+"Layout",
+"Display"
+};
+// Make sure that we don't miss things added to mozFlushType!
+MOZ_ASSERT(static_cast<uint32_t>(flushType) <= ArrayLength(flushTypeNames));
+PROFILER_LABEL_PRINTF("layout", "Flush", "(Flush_%s)",
+flushTypeNames[flushType - 1]);
+#endif
+#ifdef ACCESSIBILITY
+#ifdef DEBUG
+nsAccessibilityService* accService = GetAccService();
+if (accService) {
+NS_ASSERTION(!accService->IsProcessingRefreshDriverNotification(),
+"Flush during accessible tree update!");
+}
+#endif
+#endif
+NS_ASSERTION(flushType >= Flush_Frames, "Why did we get called?");
+bool isSafeToFlush = IsSafeToFlush();
+// If layout could possibly trigger scripts, then it's only safe to flush if
+// it's safe to run script.
+bool hasHadScriptObject;
+if (mDocument->GetScriptHandlingObject(hasHadScriptObject) ||
+hasHadScriptObject) {
+isSafeToFlush = isSafeToFlush && nsContentUtils::IsSafeToRunScript();
+}
+NS_ASSERTION(!isSafeToFlush || mViewManager, "Must have view manager");
+// Make sure the view manager stays alive.
+nsRefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
+if (isSafeToFlush && mViewManager) {
+// Processing pending notifications can kill us, and some callers only
+// hold weak refs when calling FlushPendingNotifications().  :(
+nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
+if (mResizeEvent.IsPending()) {
+FireResizeEvent();
+if (mIsDestroying) {
+return;
+}
+}
+// We need to make sure external resource documents are flushed too (for
+// example, svg filters that reference a filter in an external document
+// need the frames in the external document to be constructed for the
+// filter to work). We only need external resources to be flushed when the
+// main document is flushing >= Flush_Frames, so we flush external
+// resources here instead of nsDocument::FlushPendingNotifications.
+mDocument->FlushExternalResources(flushType);
+// Force flushing of any pending content notifications that might have
+// queued up while our event was pending.  That will ensure that we don't
+// construct frames for content right now that's still waiting to be
+// notified on,
+mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
+// Process pending restyles, since any flush of the presshell wants
+// up-to-date style data.
+if (!mIsDestroying) {
+mViewManager->FlushDelayedResize(false);
+mPresContext->FlushPendingMediaFeatureValuesChanged();
+// Flush any pending update of the user font set, since that could
+// cause style changes (for updating ex/ch units, and to cause a
+// reflow).
+mPresContext->FlushUserFontSet();
+// Flush any requested SMIL samples.
+if (mDocument->HasAnimationController()) {
+mDocument->GetAnimationController()->FlushResampleRequests();
+}
+if (aFlush.mFlushAnimations &&
+nsLayoutUtils::AreAsyncAnimationsEnabled() &&
+!mPresContext->StyleUpdateForAllAnimationsIsUpToDate()) {
+mPresContext->AnimationManager()->
+FlushAnimations(CommonAnimationManager::Cannot_Throttle);
+mPresContext->TransitionManager()->
+FlushTransitions(CommonAnimationManager::Cannot_Throttle);
+mPresContext->TickLastStyleUpdateForAllAnimations();
+}
+// The FlushResampleRequests() above flushed style changes.
+if (!mIsDestroying) {
+nsAutoScriptBlocker scriptBlocker;
+mPresContext->RestyleManager()->ProcessPendingRestyles();
+}
+}
+// Dispatch any 'animationstart' events those (or earlier) restyles
+// queued up.
+if (!mIsDestroying) {
+mPresContext->AnimationManager()->DispatchEvents();
+}
+// Process whatever XBL constructors those restyles queued up.  This
+// ensures that onload doesn't fire too early and that we won't do extra
+// reflows after those constructors run.
+if (!mIsDestroying) {
+mDocument->BindingManager()->ProcessAttachedQueue();
+}
+// Now those constructors or events might have posted restyle
+// events.  At the same time, we still need up-to-date style data.
+// In particular, reflow depends on style being completely up to
+// date.  If it's not, then style context reparenting, which can
+// happen during reflow, might suddenly pick up the new rules and
+// we'll end up with frames whose style doesn't match the frame
+// type.
+if (!mIsDestroying) {
+nsAutoScriptBlocker scriptBlocker;
+mPresContext->RestyleManager()->ProcessPendingRestyles();
+}
+// There might be more pending constructors now, but we're not going to
+// worry about them.  They can't be triggered during reflow, so we should
+// be good.
+if (flushType >= (mSuppressInterruptibleReflows ? Flush_Layout : Flush_InterruptibleLayout) &&
+!mIsDestroying) {
+mFrameConstructor->RecalcQuotesAndCounters();
+mViewManager->FlushDelayedResize(true);
+if (ProcessReflowCommands(flushType < Flush_Layout) && mContentToScrollTo) {
+// We didn't get interrupted.  Go ahead and scroll to our content
+DoScrollContentIntoView();
+if (mContentToScrollTo) {
+mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
+mContentToScrollTo = nullptr;
+}
+}
+} else if (!mIsDestroying && mSuppressInterruptibleReflows &&
+flushType == Flush_InterruptibleLayout) {
+// We suppressed this flush, but the document thinks it doesn't
+// need to flush anymore.  Let it know what's really going on.
+mDocument->SetNeedLayoutFlush();
+}
+if (flushType >= Flush_Layout) {
+if (!mIsDestroying) {
+mViewManager->UpdateWidgetGeometry();
+}
+}
+}
+}
+void
+PresShell::CharacterDataWillChange(nsIDocument *aDocument,
+nsIContent*  aContent,
+CharacterDataChangeInfo* aInfo)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected CharacterDataChanged");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+if (mCaret) {
+// Invalidate the caret's current location before we call into the frame
+// constructor. It is important to do this now, and not wait until the
+// resulting reflow, because this call causes continuation frames of the
+// text frame the caret is in to forget what part of the content they
+// refer to, making it hard for them to return the correct continuation
+// frame to the caret.
+//
+// It's also important to do this before the content actually changes, since
+// in bidi text the caret needs to look at the content to determine its
+// position and shape.
+mCaret->InvalidateOutsideCaret();
+}
+}
+void
+PresShell::CharacterDataChanged(nsIDocument *aDocument,
+nsIContent*  aContent,
+CharacterDataChangeInfo* aInfo)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected CharacterDataChanged");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+nsAutoCauseReflowNotifier crNotifier(this);
+// Call this here so it only happens for real content mutations and
+// not cases when the frame constructor calls its own methods to force
+// frame reconstruction.
+nsIContent *container = aContent->GetParent();
+uint32_t selectorFlags =
+container ? (container->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
+if (selectorFlags != 0 && !aContent->IsRootOfAnonymousSubtree()) {
+Element* element = container->AsElement();
+if (aInfo->mAppend && !aContent->GetNextSibling())
+mPresContext->RestyleManager()->RestyleForAppend(element, aContent);
+else
+mPresContext->RestyleManager()->RestyleForInsertOrChange(element, aContent);
+}
+mFrameConstructor->CharacterDataChanged(aContent, aInfo);
+VERIFY_STYLE_TREE;
+}
+void
+PresShell::ContentStateChanged(nsIDocument* aDocument,
+nsIContent* aContent,
+EventStates aStateMask)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentStateChanged");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+if (mDidInitialize) {
+nsAutoCauseReflowNotifier crNotifier(this);
+mPresContext->RestyleManager()->ContentStateChanged(aContent, aStateMask);
+VERIFY_STYLE_TREE;
+}
+}
+void
+PresShell::DocumentStatesChanged(nsIDocument* aDocument,
+EventStates aStateMask)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected DocumentStatesChanged");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+if (mDidInitialize &&
+mStyleSet->HasDocumentStateDependentStyle(mPresContext,
+mDocument->GetRootElement(),
+aStateMask)) {
+mPresContext->RestyleManager()->PostRestyleEvent(mDocument->GetRootElement(),
+eRestyle_Subtree,
+NS_STYLE_HINT_NONE);
+VERIFY_STYLE_TREE;
+}
+if (aStateMask.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
+nsIFrame* root = mFrameConstructor->GetRootFrame();
+if (root) {
+root->SchedulePaint();
+}
+}
+}
+void
+PresShell::AttributeWillChange(nsIDocument* aDocument,
+Element*     aElement,
+int32_t      aNameSpaceID,
+nsIAtom*     aAttribute,
+int32_t      aModType)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected AttributeWillChange");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+// XXXwaterson it might be more elegant to wait until after the
+// initial reflow to begin observing the document. That would
+// squelch any other inappropriate notifications as well.
+if (mDidInitialize) {
+nsAutoCauseReflowNotifier crNotifier(this);
+mPresContext->RestyleManager()->AttributeWillChange(aElement, aNameSpaceID,
+aAttribute, aModType);
+VERIFY_STYLE_TREE;
+}
+}
+void
+PresShell::AttributeChanged(nsIDocument* aDocument,
+Element*     aElement,
+int32_t      aNameSpaceID,
+nsIAtom*     aAttribute,
+int32_t      aModType)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected AttributeChanged");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+// XXXwaterson it might be more elegant to wait until after the
+// initial reflow to begin observing the document. That would
+// squelch any other inappropriate notifications as well.
+if (mDidInitialize) {
+nsAutoCauseReflowNotifier crNotifier(this);
+mPresContext->RestyleManager()->AttributeChanged(aElement, aNameSpaceID,
+aAttribute, aModType);
+VERIFY_STYLE_TREE;
+}
+}
+void
+PresShell::ContentAppended(nsIDocument *aDocument,
+nsIContent* aContainer,
+nsIContent* aFirstNewContent,
+int32_t     aNewIndexInContainer)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentAppended");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+NS_PRECONDITION(aContainer, "must have container");
+if (!mDidInitialize) {
+return;
+}
+nsAutoCauseReflowNotifier crNotifier(this);
+// Call this here so it only happens for real content mutations and
+// not cases when the frame constructor calls its own methods to force
+// frame reconstruction.
+if (aContainer->IsElement()) {
+// Ensure the container is an element before trying to restyle
+// because it can be the case that the container is a ShadowRoot
+// which is a document fragment.
+mPresContext->RestyleManager()->
+RestyleForAppend(aContainer->AsElement(), aFirstNewContent);
+}
+mFrameConstructor->ContentAppended(aContainer, aFirstNewContent, true);
+if (static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument) &&
+aFirstNewContent->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
+NotifyFontSizeInflationEnabledIsDirty();
+}
+VERIFY_STYLE_TREE;
+}
+void
+PresShell::ContentInserted(nsIDocument* aDocument,
+nsIContent*  aContainer,
+nsIContent*  aChild,
+int32_t      aIndexInContainer)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentInserted");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+if (!mDidInitialize) {
+return;
+}
+nsAutoCauseReflowNotifier crNotifier(this);
+// Call this here so it only happens for real content mutations and
+// not cases when the frame constructor calls its own methods to force
+// frame reconstruction.
+if (aContainer && aContainer->IsElement()) {
+// Ensure the container is an element before trying to restyle
+// because it can be the case that the container is a ShadowRoot
+// which is a document fragment.
+mPresContext->RestyleManager()->
+RestyleForInsertOrChange(aContainer->AsElement(), aChild);
+}
+mFrameConstructor->ContentInserted(aContainer, aChild, nullptr, true);
+if (((!aContainer && aDocument) ||
+(static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument))) &&
+aChild->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
+NotifyFontSizeInflationEnabledIsDirty();
+}
+VERIFY_STYLE_TREE;
+}
+void
+PresShell::ContentRemoved(nsIDocument *aDocument,
+nsIContent* aContainer,
+nsIContent* aChild,
+int32_t     aIndexInContainer,
+nsIContent* aPreviousSibling)
+{
+NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentRemoved");
+NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
+// Make sure that the caret doesn't leave a turd where the child used to be.
+if (mCaret) {
+mCaret->InvalidateOutsideCaret();
+}
+// Notify the ESM that the content has been removed, so that
+// it can clean up any state related to the content.
+// XXX_jwir3: There is no null check for aDocument necessary, since, even
+//            though by nsIMutationObserver, aDocument could be null, the
+//            precondition check that mDocument == aDocument ensures that
+//            aDocument will not be null (since mDocument can't be null unless
+//            we're still intializing).
+mPresContext->EventStateManager()->ContentRemoved(aDocument, aChild);
+nsAutoCauseReflowNotifier crNotifier(this);
+// Call this here so it only happens for real content mutations and
+// not cases when the frame constructor calls its own methods to force
+// frame reconstruction.
+nsIContent* oldNextSibling;
+if (aContainer) {
+oldNextSibling = aContainer->GetChildAt(aIndexInContainer);
+} else {
+oldNextSibling = nullptr;
+}
+if (aContainer && aContainer->IsElement()) {
+mPresContext->RestyleManager()->
+RestyleForRemove(aContainer->AsElement(), aChild, oldNextSibling);
+}
+bool didReconstruct;
+mFrameConstructor->ContentRemoved(aContainer, aChild, oldNextSibling,
+nsCSSFrameConstructor::REMOVE_CONTENT,
+&didReconstruct);
+if (((aContainer &&
+static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument)) ||
+aDocument) && aChild->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
+NotifyFontSizeInflationEnabledIsDirty();
+}
+VERIFY_STYLE_TREE;
+}
+nsresult
+PresShell::ReconstructFrames(void)
+{
+NS_PRECONDITION(!mFrameConstructor->GetRootFrame() || mDidInitialize,
+"Must not have root frame before initial reflow");
+if (!mDidInitialize) {
+// Nothing to do here
+return NS_OK;
+}
+nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
+// Have to make sure that the content notifications are flushed before we
+// start messing with the frame model; otherwise we can get content doubling.
+mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
+nsAutoCauseReflowNotifier crNotifier(this);
+mFrameConstructor->BeginUpdate();
+nsresult rv = mFrameConstructor->ReconstructDocElementHierarchy();
+VERIFY_STYLE_TREE;
+mFrameConstructor->EndUpdate();
+return rv;
+}
+void
+nsIPresShell::ReconstructStyleDataInternal()
+{
+nsAutoTArray<nsRefPtr<mozilla::dom::Element>,1> scopeRoots;
+mChangedScopeStyleRoots.SwapElements(scopeRoots);
+if (mStylesHaveChanged) {
+// If we need to restyle everything, no need to restyle individual
+// scoped style roots.
+scopeRoots.Clear();
+}
+mStylesHaveChanged = false;
+if (mIsDestroying) {
+// We don't want to mess with restyles at this point
+return;
+}
+if (mPresContext) {
+mPresContext->RebuildUserFontSet();
+}
+Element* root = mDocument->GetRootElement();
+if (!mDidInitialize) {
+// Nothing to do here, since we have no frames yet
+return;
+}
+if (!root) {
+// No content to restyle
+return;
+}
+RestyleManager* restyleManager = mPresContext->RestyleManager();
+if (scopeRoots.IsEmpty()) {
+// If scopeRoots is empty, we know that mStylesHaveChanged was true at
+// the beginning of this function, and that we need to restyle the whole
+// document.
+restyleManager->PostRestyleEvent(root, eRestyle_Subtree,
+NS_STYLE_HINT_NONE);
+} else {
+for (uint32_t i = 0; i < scopeRoots.Length(); i++) {
+Element* scopeRoot = scopeRoots[i];
+restyleManager->PostRestyleEvent(scopeRoot, eRestyle_Subtree,
+NS_STYLE_HINT_NONE);
+}
+}
+}
+void
+nsIPresShell::ReconstructStyleDataExternal()
+{
+ReconstructStyleDataInternal();
+}
+void
+PresShell::RecordStyleSheetChange(nsIStyleSheet* aStyleSheet)
+{
+if (mStylesHaveChanged)
+return;
+nsRefPtr<nsCSSStyleSheet> cssStyleSheet = do_QueryObject(aStyleSheet);
+if (cssStyleSheet) {
+Element* scopeElement = cssStyleSheet->GetScopeElement();
+if (scopeElement) {
+mChangedScopeStyleRoots.AppendElement(scopeElement);
+return;
+}
+}
+mStylesHaveChanged = true;
+}
+void
+PresShell::StyleSheetAdded(nsIDocument *aDocument,
+nsIStyleSheet* aStyleSheet,
+bool aDocumentSheet)
+{
+// We only care when enabled sheets are added
+NS_PRECONDITION(aStyleSheet, "Must have a style sheet!");
+if (aStyleSheet->IsApplicable() && aStyleSheet->HasRules()) {
+RecordStyleSheetChange(aStyleSheet);
+}
+}
+void
+PresShell::StyleSheetRemoved(nsIDocument *aDocument,
+nsIStyleSheet* aStyleSheet,
+bool aDocumentSheet)
+{
+// We only care when enabled sheets are removed
+NS_PRECONDITION(aStyleSheet, "Must have a style sheet!");
+if (aStyleSheet->IsApplicable() && aStyleSheet->HasRules()) {
+RecordStyleSheetChange(aStyleSheet);
+}
+}
+void
+PresShell::StyleSheetApplicableStateChanged(nsIDocument *aDocument,
+nsIStyleSheet* aStyleSheet,
+bool aApplicable)
+{
+if (aStyleSheet->HasRules()) {
+RecordStyleSheetChange(aStyleSheet);
+}
+}
+void
+PresShell::StyleRuleChanged(nsIDocument *aDocument,
+nsIStyleSheet* aStyleSheet,
+nsIStyleRule* aOldStyleRule,
+nsIStyleRule* aNewStyleRule)
+{
+RecordStyleSheetChange(aStyleSheet);
+}
+void
+PresShell::StyleRuleAdded(nsIDocument *aDocument,
+nsIStyleSheet* aStyleSheet,
+nsIStyleRule* aStyleRule)
+{
+RecordStyleSheetChange(aStyleSheet);
+}
+void
+PresShell::StyleRuleRemoved(nsIDocument *aDocument,
+nsIStyleSheet* aStyleSheet,
+nsIStyleRule* aStyleRule)
+{
+RecordStyleSheetChange(aStyleSheet);
+}
+nsIFrame*
+PresShell::GetRealPrimaryFrameFor(nsIContent* aContent) const
+{
+if (aContent->GetDocument() != GetDocument()) {
+return nullptr;
+}
+nsIFrame *primaryFrame = aContent->GetPrimaryFrame();
+if (!primaryFrame)
+return nullptr;
+return nsPlaceholderFrame::GetRealFrameFor(primaryFrame);
+}
+nsIFrame*
+PresShell::GetPlaceholderFrameFor(nsIFrame* aFrame) const
+{
+return mFrameConstructor->GetPlaceholderFrameFor(aFrame);
+}
+nsresult
+PresShell::RenderDocument(const nsRect& aRect, uint32_t aFlags,
+nscolor aBackgroundColor,
+gfxContext* aThebesContext)
+{
+NS_ENSURE_TRUE(!(aFlags & RENDER_IS_UNTRUSTED), NS_ERROR_NOT_IMPLEMENTED);
+nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
+if (rootPresContext) {
+rootPresContext->FlushWillPaintObservers();
+if (mIsDestroying)
+return NS_OK;
+}
+nsAutoScriptBlocker blockScripts;
+// Set up the rectangle as the path in aThebesContext
+gfxRect r(0, 0,
+nsPresContext::AppUnitsToFloatCSSPixels(aRect.width),
+nsPresContext::AppUnitsToFloatCSSPixels(aRect.height));
+aThebesContext->NewPath();
+#ifdef MOZ_GFX_OPTIMIZE_MOBILE
+aThebesContext->Rectangle(r, true);
+#else
+aThebesContext->Rectangle(r);
+#endif
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+if (!rootFrame) {
+// Nothing to paint, just fill the rect
+aThebesContext->SetColor(gfxRGBA(aBackgroundColor));
+aThebesContext->Fill();
+return NS_OK;
+}
+gfxContextAutoSaveRestore save(aThebesContext);
+gfxContext::GraphicsOperator oldOperator = aThebesContext->CurrentOperator();
+if (oldOperator == gfxContext::OPERATOR_OVER) {
+// Clip to the destination rectangle before we push the group,
+// to limit the size of the temporary surface
+aThebesContext->Clip();
+}
+// we want the window to be composited as a single image using
+// whatever operator was set; set OPERATOR_OVER here, which is
+// either already the case, or overrides the operator in a group.
+// the original operator will be present when we PopGroup.
+// we can avoid using a temporary surface if we're using OPERATOR_OVER
+bool needsGroup = oldOperator != gfxContext::OPERATOR_OVER;
+if (needsGroup) {
+aThebesContext->PushGroup(NS_GET_A(aBackgroundColor) == 0xff ?
+gfxContentType::COLOR :
+gfxContentType::COLOR_ALPHA);
+aThebesContext->Save();
+if (oldOperator != gfxContext::OPERATOR_OVER) {
+// Clip now while we paint to the temporary surface. For
+// non-source-bounded operators (e.g., SOURCE), we need to do clip
+// here after we've pushed the group, so that eventually popping
+// the group and painting it will be able to clear the entire
+// destination surface.
+aThebesContext->Clip();
+aThebesContext->SetOperator(gfxContext::OPERATOR_OVER);
+}
+}
+aThebesContext->Translate(gfxPoint(-nsPresContext::AppUnitsToFloatCSSPixels(aRect.x),
+-nsPresContext::AppUnitsToFloatCSSPixels(aRect.y)));
+nsDeviceContext* devCtx = mPresContext->DeviceContext();
+gfxFloat scale = gfxFloat(devCtx->AppUnitsPerDevPixel())/nsPresContext::AppUnitsPerCSSPixel();
+aThebesContext->Scale(scale, scale);
+// Since canvas APIs use floats to set up their matrices, we may have
+// some slight inaccuracy here. Adjust matrix components that are
+// integers up to the accuracy of floats to be those integers.
+aThebesContext->NudgeCurrentMatrixToIntegers();
+AutoSaveRestoreRenderingState _(this);
+nsRefPtr<nsRenderingContext> rc = new nsRenderingContext();
+rc->Init(devCtx, aThebesContext);
+bool wouldFlushRetainedLayers = false;
+uint32_t flags = nsLayoutUtils::PAINT_IGNORE_SUPPRESSION;
+if (aThebesContext->CurrentMatrix().HasNonIntegerTranslation()) {
+flags |= nsLayoutUtils::PAINT_IN_TRANSFORM;
+}
+if (!(aFlags & RENDER_ASYNC_DECODE_IMAGES)) {
+flags |= nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES;
+}
+if (aFlags & RENDER_USE_WIDGET_LAYERS) {
+// We only support using widget layers on display root's with widgets.
+nsView* view = rootFrame->GetView();
+if (view && view->GetWidget() &&
+nsLayoutUtils::GetDisplayRootFrame(rootFrame) == rootFrame) {
+flags |= nsLayoutUtils::PAINT_WIDGET_LAYERS;
+}
+}
+if (!(aFlags & RENDER_CARET)) {
+wouldFlushRetainedLayers = true;
+flags |= nsLayoutUtils::PAINT_HIDE_CARET;
+}
+if (aFlags & RENDER_IGNORE_VIEWPORT_SCROLLING) {
+wouldFlushRetainedLayers = !IgnoringViewportScrolling();
+mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_IGNORING_VIEWPORT_SCROLLING);
+}
+if (aFlags & RENDER_DRAWWINDOW_NOT_FLUSHING) {
+mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_DRAWWINDOW_NOT_FLUSHING);
+}
+if (aFlags & RENDER_DOCUMENT_RELATIVE) {
+// XXX be smarter about this ... drawWindow might want a rect
+// that's "pretty close" to what our retained layer tree covers.
+// In that case, it wouldn't disturb normal rendering too much,
+// and we should allow it.
+wouldFlushRetainedLayers = true;
+flags |= nsLayoutUtils::PAINT_DOCUMENT_RELATIVE;
+}
+// Don't let drawWindow blow away our retained layer tree
+if ((flags & nsLayoutUtils::PAINT_WIDGET_LAYERS) && wouldFlushRetainedLayers) {
+flags &= ~nsLayoutUtils::PAINT_WIDGET_LAYERS;
+}
+nsLayoutUtils::PaintFrame(rc, rootFrame, nsRegion(aRect),
+aBackgroundColor, flags);
+// if we had to use a group, paint it to the destination now
+if (needsGroup) {
+aThebesContext->Restore();
+aThebesContext->PopGroupToSource();
+aThebesContext->Paint();
+}
+return NS_OK;
+}
+/*
+* Clip the display list aList to a range. Returns the clipped
+* rectangle surrounding the range.
+*/
+nsRect
+PresShell::ClipListToRange(nsDisplayListBuilder *aBuilder,
+nsDisplayList* aList,
+nsRange* aRange)
+{
+// iterate though the display items and add up the bounding boxes of each.
+// This will allow the total area of the frames within the range to be
+// determined. To do this, remove an item from the bottom of the list, check
+// whether it should be part of the range, and if so, append it to the top
+// of the temporary list tmpList. If the item is a text frame at the end of
+// the selection range, clip it to the portion of the text frame that is
+// part of the selection. Then, append the wrapper to the top of the list.
+// Otherwise, just delete the item and don't append it.
+nsRect surfaceRect;
+nsDisplayList tmpList;
+nsDisplayItem* i;
+while ((i = aList->RemoveBottom())) {
+// itemToInsert indiciates the item that should be inserted into the
+// temporary list. If null, no item should be inserted.
+nsDisplayItem* itemToInsert = nullptr;
+nsIFrame* frame = i->Frame();
+nsIContent* content = frame->GetContent();
+if (content) {
+bool atStart = (content == aRange->GetStartParent());
+bool atEnd = (content == aRange->GetEndParent());
+if ((atStart || atEnd) && frame->GetType() == nsGkAtoms::textFrame) {
+int32_t frameStartOffset, frameEndOffset;
+frame->GetOffsets(frameStartOffset, frameEndOffset);
+int32_t hilightStart =
+atStart ? std::max(aRange->StartOffset(), frameStartOffset) : frameStartOffset;
+int32_t hilightEnd =
+atEnd ? std::min(aRange->EndOffset(), frameEndOffset) : frameEndOffset;
+if (hilightStart < hilightEnd) {
+// determine the location of the start and end edges of the range.
+nsPoint startPoint, endPoint;
+frame->GetPointFromOffset(hilightStart, &startPoint);
+frame->GetPointFromOffset(hilightEnd, &endPoint);
+// the clip rectangle is determined by taking the the start and
+// end points of the range, offset from the reference frame.
+// Because of rtl, the end point may be to the left of the
+// start point, so x is set to the lowest value
+nsRect textRect(aBuilder->ToReferenceFrame(frame), frame->GetSize());
+nscoord x = std::min(startPoint.x, endPoint.x);
+textRect.x += x;
+textRect.width = std::max(startPoint.x, endPoint.x) - x;
+surfaceRect.UnionRect(surfaceRect, textRect);
+DisplayItemClip newClip;
+newClip.SetTo(textRect);
+newClip.IntersectWith(i->GetClip());
+i->SetClip(aBuilder, newClip);
+itemToInsert = i;
+}
+}
+// Don't try to descend into subdocuments.
+// If this ever changes we'd need to add handling for subdocuments with
+// different zoom levels.
+else if (content->GetCurrentDoc() ==
+aRange->GetStartParent()->GetCurrentDoc()) {
+// if the node is within the range, append it to the temporary list
+bool before, after;
+nsresult rv =
+nsRange::CompareNodeToRange(content, aRange, &before, &after);
+if (NS_SUCCEEDED(rv) && !before && !after) {
+itemToInsert = i;
+bool snap;
+surfaceRect.UnionRect(surfaceRect, i->GetBounds(aBuilder, &snap));
+}
+}
+}
+// insert the item into the list if necessary. If the item has a child
+// list, insert that as well
+nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
+if (itemToInsert || sublist) {
+tmpList.AppendToTop(itemToInsert ? itemToInsert : i);
+// if the item is a list, iterate over it as well
+if (sublist)
+surfaceRect.UnionRect(surfaceRect,
+ClipListToRange(aBuilder, sublist, aRange));
+}
+else {
+// otherwise, just delete the item and don't readd it to the list
+i->~nsDisplayItem();
+}
+}
+// now add all the items back onto the original list again
+aList->AppendToTop(&tmpList);
+return surfaceRect;
+}
+#ifdef DEBUG
+#include <stdio.h>
+static bool gDumpRangePaintList = false;
+#endif
+RangePaintInfo*
+PresShell::CreateRangePaintInfo(nsIDOMRange* aRange,
+nsRect& aSurfaceRect,
+bool aForPrimarySelection)
+{
+RangePaintInfo* info = nullptr;
+nsRange* range = static_cast<nsRange*>(aRange);
+nsIFrame* ancestorFrame;
+nsIFrame* rootFrame = GetRootFrame();
+// If the start or end of the range is the document, just use the root
+// frame, otherwise get the common ancestor of the two endpoints of the
+// range.
+nsINode* startParent = range->GetStartParent();
+nsINode* endParent = range->GetEndParent();
+nsIDocument* doc = startParent->GetCurrentDoc();
+if (startParent == doc || endParent == doc) {
+ancestorFrame = rootFrame;
+}
+else {
+nsINode* ancestor = nsContentUtils::GetCommonAncestor(startParent, endParent);
+NS_ASSERTION(!ancestor || ancestor->IsNodeOfType(nsINode::eCONTENT),
+"common ancestor is not content");
+if (!ancestor || !ancestor->IsNodeOfType(nsINode::eCONTENT))
+return nullptr;
+nsIContent* ancestorContent = static_cast<nsIContent*>(ancestor);
+ancestorFrame = ancestorContent->GetPrimaryFrame();
+// use the nearest ancestor frame that includes all continuations as the
+// root for building the display list
+while (ancestorFrame &&
+nsLayoutUtils::GetNextContinuationOrIBSplitSibling(ancestorFrame))
+ancestorFrame = ancestorFrame->GetParent();
+}
+if (!ancestorFrame)
+return nullptr;
+info = new RangePaintInfo(range, ancestorFrame);
+nsRect ancestorRect = ancestorFrame->GetVisualOverflowRect();
+// get a display list containing the range
+info->mBuilder.SetIncludeAllOutOfFlows();
+if (aForPrimarySelection) {
+info->mBuilder.SetSelectedFramesOnly();
+}
+info->mBuilder.EnterPresShell(ancestorFrame, ancestorRect);
+ancestorFrame->BuildDisplayListForStackingContext(&info->mBuilder,
+ancestorRect, &info->mList);
+#ifdef DEBUG
+if (gDumpRangePaintList) {
+fprintf(stderr, "CreateRangePaintInfo --- before ClipListToRange:\n");
+nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
+}
+#endif
+nsRect rangeRect = ClipListToRange(&info->mBuilder, &info->mList, range);
+info->mBuilder.LeavePresShell(ancestorFrame, ancestorRect);
+#ifdef DEBUG
+if (gDumpRangePaintList) {
+fprintf(stderr, "CreateRangePaintInfo --- after ClipListToRange:\n");
+nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
+}
+#endif
+// determine the offset of the reference frame for the display list
+// to the root frame. This will allow the coordinates used when painting
+// to all be offset from the same point
+info->mRootOffset = ancestorFrame->GetOffsetTo(rootFrame);
+rangeRect.MoveBy(info->mRootOffset);
+aSurfaceRect.UnionRect(aSurfaceRect, rangeRect);
+return info;
+}
+TemporaryRef<SourceSurface>
+PresShell::PaintRangePaintInfo(nsTArray<nsAutoPtr<RangePaintInfo> >* aItems,
+nsISelection* aSelection,
+nsIntRegion* aRegion,
+nsRect aArea,
+nsIntPoint& aPoint,
+nsIntRect* aScreenRect)
+{
+nsPresContext* pc = GetPresContext();
+if (!pc || aArea.width == 0 || aArea.height == 0)
+return nullptr;
+nsDeviceContext* deviceContext = pc->DeviceContext();
+// use the rectangle to create the surface
+nsIntRect pixelArea = aArea.ToOutsidePixels(pc->AppUnitsPerDevPixel());
+// if the area of the image is larger than the maximum area, scale it down
+float scale = 0.0;
+nsIntRect rootScreenRect =
+GetRootFrame()->GetScreenRectInAppUnits().ToNearestPixels(
+pc->AppUnitsPerDevPixel());
+// if the image is larger in one or both directions than half the size of
+// the available screen area, scale the image down to that size.
+nsRect maxSize;
+deviceContext->GetClientRect(maxSize);
+nscoord maxWidth = pc->AppUnitsToDevPixels(maxSize.width >> 1);
+nscoord maxHeight = pc->AppUnitsToDevPixels(maxSize.height >> 1);
+bool resize = (pixelArea.width > maxWidth || pixelArea.height > maxHeight);
+if (resize) {
+scale = 1.0;
+// divide the maximum size by the image size in both directions. Whichever
+// direction produces the smallest result determines how much should be
+// scaled.
+if (pixelArea.width > maxWidth)
+scale = std::min(scale, float(maxWidth) / pixelArea.width);
+if (pixelArea.height > maxHeight)
+scale = std::min(scale, float(maxHeight) / pixelArea.height);
+pixelArea.width = NSToIntFloor(float(pixelArea.width) * scale);
+pixelArea.height = NSToIntFloor(float(pixelArea.height) * scale);
+// adjust the screen position based on the rescaled size
+nscoord left = rootScreenRect.x + pixelArea.x;
+nscoord top = rootScreenRect.y + pixelArea.y;
+aScreenRect->x = NSToIntFloor(aPoint.x - float(aPoint.x - left) * scale);
+aScreenRect->y = NSToIntFloor(aPoint.y - float(aPoint.y - top) * scale);
+}
+else {
+// move aScreenRect to the position of the surface in screen coordinates
+aScreenRect->MoveTo(rootScreenRect.x + pixelArea.x, rootScreenRect.y + pixelArea.y);
+}
+aScreenRect->width = pixelArea.width;
+aScreenRect->height = pixelArea.height;
+RefPtr<DrawTarget> dt =
+gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
+IntSize(pixelArea.width, pixelArea.height),
+SurfaceFormat::B8G8R8A8);
+if (!dt) {
+return nullptr;
+}
+nsRefPtr<gfxContext> ctx = new gfxContext(dt);
+nsRefPtr<nsRenderingContext> rc = new nsRenderingContext();
+rc->Init(deviceContext, ctx);
+if (aRegion) {
+// Convert aRegion from CSS pixels to dev pixels
+nsIntRegion region =
+aRegion->ToAppUnits(nsPresContext::AppUnitsPerCSSPixel())
+.ToOutsidePixels(pc->AppUnitsPerDevPixel());
+rc->SetClip(region);
+}
+if (resize)
+rc->Scale(scale, scale);
+// translate so that points are relative to the surface area
+rc->Translate(-aArea.TopLeft());
+// temporarily hide the selection so that text is drawn normally. If a
+// selection is being rendered, use that, otherwise use the presshell's
+// selection.
+nsRefPtr<nsFrameSelection> frameSelection;
+if (aSelection) {
+frameSelection = static_cast<Selection*>(aSelection)->GetFrameSelection();
+}
+else {
+frameSelection = FrameSelection();
+}
+int16_t oldDisplaySelection = frameSelection->GetDisplaySelection();
+frameSelection->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
+// next, paint each range in the selection
+int32_t count = aItems->Length();
+for (int32_t i = 0; i < count; i++) {
+RangePaintInfo* rangeInfo = (*aItems)[i];
+// the display lists paint relative to the offset from the reference
+// frame, so translate the rendering context
+nsRenderingContext::AutoPushTranslation
+translate(rc, rangeInfo->mRootOffset);
+aArea.MoveBy(-rangeInfo->mRootOffset.x, -rangeInfo->mRootOffset.y);
+nsRegion visible(aArea);
+rangeInfo->mList.ComputeVisibilityForRoot(&rangeInfo->mBuilder, &visible);
+rangeInfo->mList.PaintRoot(&rangeInfo->mBuilder, rc, nsDisplayList::PAINT_DEFAULT);
+aArea.MoveBy(rangeInfo->mRootOffset.x, rangeInfo->mRootOffset.y);
+}
+// restore the old selection display state
+frameSelection->SetDisplaySelection(oldDisplaySelection);
+return dt->Snapshot();
+}
+TemporaryRef<SourceSurface>
+PresShell::RenderNode(nsIDOMNode* aNode,
+nsIntRegion* aRegion,
+nsIntPoint& aPoint,
+nsIntRect* aScreenRect)
+{
+// area will hold the size of the surface needed to draw the node, measured
+// from the root frame.
+nsRect area;
+nsTArray<nsAutoPtr<RangePaintInfo> > rangeItems;
+// nothing to draw if the node isn't in a document
+nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
+if (!node->IsInDoc())
+return nullptr;
+nsRefPtr<nsRange> range = new nsRange(node);
+if (NS_FAILED(range->SelectNode(aNode)))
+return nullptr;
+RangePaintInfo* info = CreateRangePaintInfo(range, area, false);
+if (info && !rangeItems.AppendElement(info)) {
+delete info;
+return nullptr;
+}
+if (aRegion) {
+// combine the area with the supplied region
+nsIntRect rrectPixels = aRegion->GetBounds();
+nsRect rrect = rrectPixels.ToAppUnits(nsPresContext::AppUnitsPerCSSPixel());
+area.IntersectRect(area, rrect);
+nsPresContext* pc = GetPresContext();
+if (!pc)
+return nullptr;
+// move the region so that it is offset from the topleft corner of the surface
+aRegion->MoveBy(-pc->AppUnitsToDevPixels(area.x),
+-pc->AppUnitsToDevPixels(area.y));
+}
+return PaintRangePaintInfo(&rangeItems, nullptr, aRegion, area, aPoint,
+aScreenRect);
+}
+TemporaryRef<SourceSurface>
+PresShell::RenderSelection(nsISelection* aSelection,
+nsIntPoint& aPoint,
+nsIntRect* aScreenRect)
+{
+// area will hold the size of the surface needed to draw the selection,
+// measured from the root frame.
+nsRect area;
+nsTArray<nsAutoPtr<RangePaintInfo> > rangeItems;
+// iterate over each range and collect them into the rangeItems array.
+// This is done so that the size of selection can be determined so as
+// to allocate a surface area
+int32_t numRanges;
+aSelection->GetRangeCount(&numRanges);
+NS_ASSERTION(numRanges > 0, "RenderSelection called with no selection");
+for (int32_t r = 0; r < numRanges; r++)
+{
+nsCOMPtr<nsIDOMRange> range;
+aSelection->GetRangeAt(r, getter_AddRefs(range));
+RangePaintInfo* info = CreateRangePaintInfo(range, area, true);
+if (info && !rangeItems.AppendElement(info)) {
+delete info;
+return nullptr;
+}
+}
+return PaintRangePaintInfo(&rangeItems, aSelection, nullptr, area, aPoint,
+aScreenRect);
+}
+void
+PresShell::AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
+nsDisplayList&        aList,
+nsIFrame*             aFrame,
+const nsRect&         aBounds)
+{
+aList.AppendNewToBottom(new (&aBuilder)
+nsDisplaySolidColor(&aBuilder, aFrame, aBounds, NS_RGB(115, 115, 115)));
+}
+static bool
+AddCanvasBackgroundColor(const nsDisplayList& aList, nsIFrame* aCanvasFrame,
+nscolor aColor)
+{
+for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
+if (i->Frame() == aCanvasFrame &&
+i->GetType() == nsDisplayItem::TYPE_CANVAS_BACKGROUND_COLOR) {
+nsDisplayCanvasBackgroundColor* bg = static_cast<nsDisplayCanvasBackgroundColor*>(i);
+bg->SetExtraBackgroundColor(aColor);
+return true;
+}
+nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
+if (sublist && AddCanvasBackgroundColor(*sublist, aCanvasFrame, aColor))
+return true;
+}
+return false;
+}
+void
+PresShell::AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
+nsDisplayList&        aList,
+nsIFrame*             aFrame,
+const nsRect&         aBounds,
+nscolor               aBackstopColor,
+uint32_t              aFlags)
+{
+if (aBounds.IsEmpty()) {
+return;
+}
+// We don't want to add an item for the canvas background color if the frame
+// (sub)tree we are painting doesn't include any canvas frames. There isn't
+// an easy way to check this directly, but if we check if the root of the
+// (sub)tree we are painting is a canvas frame that should cover us in all
+// cases (it will usually be a viewport frame when we have a canvas frame in
+// the (sub)tree).
+if (!(aFlags & nsIPresShell::FORCE_DRAW) &&
+!nsCSSRendering::IsCanvasFrame(aFrame)) {
+return;
+}
+nscolor bgcolor = NS_ComposeColors(aBackstopColor, mCanvasBackgroundColor);
+if (NS_GET_A(bgcolor) == 0)
+return;
+// To make layers work better, we want to avoid having a big non-scrolled
+// color background behind a scrolled transparent background. Instead,
+// we'll try to move the color background into the scrolled content
+// by making nsDisplayCanvasBackground paint it.
+if (!aFrame->GetParent()) {
+nsIScrollableFrame* sf =
+aFrame->PresContext()->PresShell()->GetRootScrollFrameAsScrollable();
+if (sf) {
+nsCanvasFrame* canvasFrame = do_QueryFrame(sf->GetScrolledFrame());
+if (canvasFrame && canvasFrame->IsVisibleForPainting(&aBuilder)) {
+if (AddCanvasBackgroundColor(aList, canvasFrame, bgcolor))
+return;
+}
+}
+}
+aList.AppendNewToBottom(
+new (&aBuilder) nsDisplaySolidColor(&aBuilder, aFrame, aBounds, bgcolor));
+}
+static bool IsTransparentContainerElement(nsPresContext* aPresContext)
+{
+nsCOMPtr<nsIDocShellTreeItem> docShellItem = aPresContext->GetDocShell();
+nsCOMPtr<nsPIDOMWindow> pwin(do_GetInterface(docShellItem));
+if (!pwin)
+return false;
+nsCOMPtr<nsIContent> containerElement =
+do_QueryInterface(pwin->GetFrameElementInternal());
+return containerElement &&
+containerElement->HasAttr(kNameSpaceID_None, nsGkAtoms::transparent);
+}
+nscolor PresShell::GetDefaultBackgroundColorToDraw()
+{
+if (!mPresContext || !mPresContext->GetBackgroundColorDraw()) {
+return NS_RGB(255,255,255);
+}
+return mPresContext->DefaultBackgroundColor();
+}
+void PresShell::UpdateCanvasBackground()
+{
+// If we have a frame tree and it has style information that
+// specifies the background color of the canvas, update our local
+// cache of that color.
+nsIFrame* rootStyleFrame = FrameConstructor()->GetRootElementStyleFrame();
+if (rootStyleFrame) {
+nsStyleContext* bgStyle =
+nsCSSRendering::FindRootFrameBackground(rootStyleFrame);
+// XXX We should really be passing the canvasframe, not the root element
+// style frame but we don't have access to the canvasframe here. It isn't
+// a problem because only a few frames can return something other than true
+// and none of them would be a canvas frame or root element style frame.
+bool drawBackgroundImage;
+bool drawBackgroundColor;
+mCanvasBackgroundColor =
+nsCSSRendering::DetermineBackgroundColor(mPresContext, bgStyle,
+rootStyleFrame,
+drawBackgroundImage,
+drawBackgroundColor);
+if (GetPresContext()->IsCrossProcessRootContentDocument() &&
+!IsTransparentContainerElement(mPresContext)) {
+mCanvasBackgroundColor =
+NS_ComposeColors(GetDefaultBackgroundColorToDraw(), mCanvasBackgroundColor);
+}
+}
+// If the root element of the document (ie html) has style 'display: none'
+// then the document's background color does not get drawn; cache the
+// color we actually draw.
+if (!FrameConstructor()->GetRootElementFrame()) {
+mCanvasBackgroundColor = GetDefaultBackgroundColorToDraw();
+}
+if (XRE_GetProcessType() == GeckoProcessType_Content) {
+if (TabChild* tabChild = TabChild::GetFrom(this)) {
+tabChild->SetBackgroundColor(mCanvasBackgroundColor);
+}
+}
+}
+nscolor PresShell::ComputeBackstopColor(nsView* aDisplayRoot)
+{
+nsIWidget* widget = aDisplayRoot->GetWidget();
+if (widget && (widget->GetTransparencyMode() != eTransparencyOpaque ||
+widget->WidgetPaintsBackground())) {
+// Within a transparent widget, so the backstop color must be
+// totally transparent.
+return NS_RGBA(0,0,0,0);
+}
+// Within an opaque widget (or no widget at all), so the backstop
+// color must be totally opaque. The user's default background
+// as reported by the prescontext is guaranteed to be opaque.
+return GetDefaultBackgroundColorToDraw();
+}
+struct PaintParams {
+nscolor mBackgroundColor;
+};
+LayerManager* PresShell::GetLayerManager()
+{
+NS_ASSERTION(mViewManager, "Should have view manager");
+nsView* rootView = mViewManager->GetRootView();
+if (rootView) {
+if (nsIWidget* widget = rootView->GetWidget()) {
+return widget->GetLayerManager();
+}
+}
+return nullptr;
+}
+void PresShell::SetIgnoreViewportScrolling(bool aIgnore)
+{
+if (IgnoringViewportScrolling() == aIgnore) {
+return;
+}
+RenderingState state(this);
+state.mRenderFlags = ChangeFlag(state.mRenderFlags, aIgnore,
+STATE_IGNORING_VIEWPORT_SCROLLING);
+SetRenderingState(state);
+}
+nsresult PresShell::SetResolution(float aXResolution, float aYResolution)
+{
+if (!(aXResolution > 0.0 && aYResolution > 0.0)) {
+return NS_ERROR_ILLEGAL_VALUE;
+}
+if (aXResolution == mXResolution && aYResolution == mYResolution) {
+return NS_OK;
+}
+RenderingState state(this);
+state.mXResolution = aXResolution;
+state.mYResolution = aYResolution;
+SetRenderingState(state);
+return NS_OK;
+}
+gfxSize PresShell::GetCumulativeResolution()
+{
+gfxSize resolution = GetResolution();
+nsPresContext* parentCtx = GetPresContext()->GetParentPresContext();
+if (parentCtx) {
+resolution = resolution * parentCtx->PresShell()->GetCumulativeResolution();
+}
+return resolution;
+}
+void PresShell::SetRenderingState(const RenderingState& aState)
+{
+if (mRenderFlags != aState.mRenderFlags) {
+// Rendering state changed in a way that forces us to flush any
+// retained layers we might already have.
+LayerManager* manager = GetLayerManager();
+if (manager) {
+FrameLayerBuilder::InvalidateAllLayers(manager);
+}
+}
+mRenderFlags = aState.mRenderFlags;
+mXResolution = aState.mXResolution;
+mYResolution = aState.mYResolution;
+}
+void PresShell::SynthesizeMouseMove(bool aFromScroll)
+{
+if (!sSynthMouseMove)
+return;
+if (mPaintingSuppressed || !mIsActive || !mPresContext) {
+return;
+}
+if (!mPresContext->IsRoot()) {
+nsIPresShell* rootPresShell = GetRootPresShell();
+if (rootPresShell) {
+rootPresShell->SynthesizeMouseMove(aFromScroll);
+}
+return;
+}
+if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE))
+return;
+if (!mSynthMouseMoveEvent.IsPending()) {
+nsRefPtr<nsSynthMouseMoveEvent> ev =
+new nsSynthMouseMoveEvent(this, aFromScroll);
+if (!GetPresContext()->RefreshDriver()->AddRefreshObserver(ev,
+Flush_Display)) {
+NS_WARNING("failed to dispatch nsSynthMouseMoveEvent");
+return;
+}
+mSynthMouseMoveEvent = ev;
+}
+}
+/**
+* Find the first floating view with a widget in a postorder traversal of the
+* view tree that contains the point. Thus more deeply nested floating views
+* are preferred over their ancestors, and floating views earlier in the
+* view hierarchy (i.e., added later) are preferred over their siblings.
+* This is adequate for finding the "topmost" floating view under a point,
+* given that floating views don't supporting having a specific z-index.
+*
+* We cannot exit early when aPt is outside the view bounds, because floating
+* views aren't necessarily included in their parent's bounds, so this could
+* traverse the entire view hierarchy --- use carefully.
+*/
+static nsView* FindFloatingViewContaining(nsView* aView, nsPoint aPt)
+{
+if (aView->GetVisibility() == nsViewVisibility_kHide)
+// No need to look into descendants.
+return nullptr;
+nsIFrame* frame = aView->GetFrame();
+if (frame) {
+if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
+!frame->PresContext()->PresShell()->IsActive()) {
+return nullptr;
+}
+}
+for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
+nsView* r = FindFloatingViewContaining(v, v->ConvertFromParentCoords(aPt));
+if (r)
+return r;
+}
+if (aView->GetFloating() && aView->HasWidget() &&
+aView->GetDimensions().Contains(aPt))
+return aView;
+return nullptr;
+}
+/*
+* This finds the first view containing the given point in a postorder
+* traversal of the view tree that contains the point, assuming that the
+* point is not in a floating view.  It assumes that only floating views
+* extend outside the bounds of their parents.
+*
+* This methods should only be called if FindFloatingViewContaining
+* returns null.
+*/
+static nsView* FindViewContaining(nsView* aView, nsPoint aPt)
+{
+if (!aView->GetDimensions().Contains(aPt) ||
+aView->GetVisibility() == nsViewVisibility_kHide) {
+return nullptr;
+}
+nsIFrame* frame = aView->GetFrame();
+if (frame) {
+if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
+!frame->PresContext()->PresShell()->IsActive()) {
+return nullptr;
+}
+}
+for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
+nsView* r = FindViewContaining(v, v->ConvertFromParentCoords(aPt));
+if (r)
+return r;
+}
+return aView;
+}
+void
+PresShell::ProcessSynthMouseMoveEvent(bool aFromScroll)
+{
+// If drag session has started, we shouldn't synthesize mousemove event.
+nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
+if (dragSession) {
+mSynthMouseMoveEvent.Forget();
+return;
+}
+// allow new event to be posted while handling this one only if the
+// source of the event is a scroll (to prevent infinite reflow loops)
+if (aFromScroll) {
+mSynthMouseMoveEvent.Forget();
+}
+nsView* rootView = mViewManager ? mViewManager->GetRootView() : nullptr;
+if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) ||
+!rootView || !rootView->HasWidget() || !mPresContext) {
+mSynthMouseMoveEvent.Forget();
+return;
+}
+NS_ASSERTION(mPresContext->IsRoot(), "Only a root pres shell should be here");
+// Hold a ref to ourselves so DispatchEvent won't destroy us (since
+// we need to access members after we call DispatchEvent).
+nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
+#ifdef DEBUG_MOUSE_LOCATION
+printf("[ps=%p]synthesizing mouse move to (%d,%d)\n",
+this, mMouseLocation.x, mMouseLocation.y);
+#endif
+int32_t APD = mPresContext->AppUnitsPerDevPixel();
+// We need a widget to put in the event we are going to dispatch so we look
+// for a view that has a widget and the mouse location is over. We first look
+// for floating views, if there isn't one we use the root view. |view| holds
+// that view.
+nsView* view = nullptr;
+// The appunits per devpixel ratio of |view|.
+int32_t viewAPD;
+// refPoint will be mMouseLocation relative to the widget of |view|, the
+// widget we will put in the event we dispatch, in viewAPD appunits
+nsPoint refpoint(0, 0);
+// We always dispatch the event to the pres shell that contains the view that
+// the mouse is over. pointVM is the VM of that pres shell.
+nsViewManager *pointVM = nullptr;
+// This could be a bit slow (traverses entire view hierarchy)
+// but it's OK to do it once per synthetic mouse event
+view = FindFloatingViewContaining(rootView, mMouseLocation);
+if (!view) {
+view = rootView;
+nsView *pointView = FindViewContaining(rootView, mMouseLocation);
+// pointView can be null in situations related to mouse capture
+pointVM = (pointView ? pointView : view)->GetViewManager();
+refpoint = mMouseLocation + rootView->ViewToWidgetOffset();
+viewAPD = APD;
+} else {
+pointVM = view->GetViewManager();
+nsIFrame* frame = view->GetFrame();
+NS_ASSERTION(frame, "floating views can't be anonymous");
+viewAPD = frame->PresContext()->AppUnitsPerDevPixel();
+refpoint = mMouseLocation.ConvertAppUnits(APD, viewAPD);
+refpoint -= view->GetOffsetTo(rootView);
+refpoint += view->ViewToWidgetOffset();
+}
+NS_ASSERTION(view->GetWidget(), "view should have a widget here");
+WidgetMouseEvent event(true, NS_MOUSE_MOVE, view->GetWidget(),
+WidgetMouseEvent::eSynthesized);
+event.refPoint = LayoutDeviceIntPoint::FromAppUnitsToNearest(refpoint, viewAPD);
+event.time = PR_IntervalNow();
+// XXX set event.modifiers ?
+// XXX mnakano I think that we should get the latest information from widget.
+nsCOMPtr<nsIPresShell> shell = pointVM->GetPresShell();
+if (shell) {
+shell->DispatchSynthMouseMove(&event, !aFromScroll);
+}
+if (!aFromScroll) {
+mSynthMouseMoveEvent.Forget();
+}
+}
+/* static */ void
+PresShell::MarkImagesInListVisible(const nsDisplayList& aList)
+{
+for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
+nsDisplayList* sublist = item->GetChildren();
+if (sublist) {
+MarkImagesInListVisible(*sublist);
+continue;
+}
+nsIFrame* f = item->Frame();
+// We could check the type of the display item, only a handful can hold an
+// image loading content.
+// dont bother nscomptr here, it is wasteful
+nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(f->GetContent()));
+if (content) {
+// use the presshell containing the image
+PresShell* presShell = static_cast<PresShell*>(f->PresContext()->PresShell());
+uint32_t count = presShell->mVisibleImages.Count();
+presShell->mVisibleImages.PutEntry(content);
+if (presShell->mVisibleImages.Count() > count) {
+// content was added to mVisibleImages, so we need to increment its visible count
+content->IncrementVisibleCount();
+}
+}
+}
+}
+static PLDHashOperator
+RemoveAndStore(nsRefPtrHashKey<nsIImageLoadingContent>* aEntry, void* userArg)
+{
+nsTArray< nsRefPtr<nsIImageLoadingContent> >* array =
+static_cast< nsTArray< nsRefPtr<nsIImageLoadingContent> >* >(userArg);
+array->AppendElement(aEntry->GetKey());
+return PL_DHASH_REMOVE;
+}
+void
+PresShell::RebuildImageVisibility(const nsDisplayList& aList)
+{
+MOZ_ASSERT(!mImageVisibilityVisited, "already visited?");
+mImageVisibilityVisited = true;
+// Remove the entries of the mVisibleImages hashtable and put them in the
+// beforeImageList array.
+nsTArray< nsRefPtr<nsIImageLoadingContent> > beforeImageList;
+beforeImageList.SetCapacity(mVisibleImages.Count());
+mVisibleImages.EnumerateEntries(RemoveAndStore, &beforeImageList);
+MarkImagesInListVisible(aList);
+for (uint32_t i = 0; i < beforeImageList.Length(); ++i) {
+beforeImageList[i]->DecrementVisibleCount();
+}
+}
+/* static */ void
+PresShell::ClearImageVisibilityVisited(nsView* aView, bool aClear)
+{
+nsViewManager* vm = aView->GetViewManager();
+if (aClear) {
+PresShell* presShell = static_cast<PresShell*>(vm->GetPresShell());
+if (!presShell->mImageVisibilityVisited) {
+presShell->ClearVisibleImagesList();
+}
+presShell->mImageVisibilityVisited = false;
+}
+for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
+ClearImageVisibilityVisited(v, v->GetViewManager() != vm);
+}
+}
+static PLDHashOperator
+DecrementVisibleCount(nsRefPtrHashKey<nsIImageLoadingContent>* aEntry, void* userArg)
+{
+aEntry->GetKey()->DecrementVisibleCount();
+return PL_DHASH_NEXT;
+}
+void
+PresShell::ClearVisibleImagesList()
+{
+mVisibleImages.EnumerateEntries(DecrementVisibleCount, nullptr);
+mVisibleImages.Clear();
+}
+void
+PresShell::UpdateImageVisibility()
+{
+MOZ_ASSERT(!mPresContext || mPresContext->IsRootContentDocument(),
+"updating image visibility on a non-root content document?");
+mUpdateImageVisibilityEvent.Revoke();
+if (mHaveShutDown || mIsDestroying) {
+return;
+}
+// call update on that frame
+nsIFrame* rootFrame = GetRootFrame();
+if (!rootFrame) {
+ClearVisibleImagesList();
+return;
+}
+// We could walk the frame tree directly and skip creating a display list for
+// better perf.
+nsRect updateRect(nsPoint(0, 0), rootFrame->GetSize());
+nsDisplayListBuilder builder(rootFrame, nsDisplayListBuilder::IMAGE_VISIBILITY, true);
+builder.IgnorePaintSuppression();
+builder.EnterPresShell(rootFrame, updateRect);
+nsDisplayList list;
+rootFrame->BuildDisplayListForStackingContext(&builder, updateRect, &list);
+builder.LeavePresShell(rootFrame, updateRect);
+RebuildImageVisibility(list);
+ClearImageVisibilityVisited(rootFrame->GetView(), true);
+list.DeleteAll();
+}
+bool
+PresShell::AssumeAllImagesVisible()
+{
+static bool sImageVisibilityEnabled = true;
+static bool sImageVisibilityEnabledForBrowserElementsOnly = false;
+static bool sImageVisibilityPrefCached = false;
+if (!sImageVisibilityPrefCached) {
+Preferences::AddBoolVarCache(&sImageVisibilityEnabled,
+"layout.imagevisibility.enabled", true);
+Preferences::AddBoolVarCache(&sImageVisibilityEnabledForBrowserElementsOnly,
+"layout.imagevisibility.enabled_for_browser_elements_only", false);
+sImageVisibilityPrefCached = true;
+}
+if ((!sImageVisibilityEnabled &&
+!sImageVisibilityEnabledForBrowserElementsOnly) ||
+!mPresContext || !mDocument) {
+return true;
+}
+// We assume all images are visible in print, print preview, chrome, xul, and
+// resource docs and don't keep track of them.
+if (mPresContext->Type() == nsPresContext::eContext_PrintPreview ||
+mPresContext->Type() == nsPresContext::eContext_Print ||
+mPresContext->IsChrome() ||
+mDocument->IsResourceDoc() ||
+mDocument->IsXUL()) {
+return true;
+}
+if (!sImageVisibilityEnabled &&
+sImageVisibilityEnabledForBrowserElementsOnly) {
+nsCOMPtr<nsIDocShell> docshell(mPresContext->GetDocShell());
+if (!docshell || !docshell->GetIsInBrowserElement()) {
+return true;
+}
+}
+return false;
+}
+void
+PresShell::ScheduleImageVisibilityUpdate()
+{
+if (AssumeAllImagesVisible())
+return;
+if (!mPresContext->IsRootContentDocument()) {
+nsPresContext* presContext = mPresContext->GetToplevelContentDocumentPresContext();
+if (!presContext)
+return;
+MOZ_ASSERT(presContext->IsRootContentDocument(),
+"Didn't get a root prescontext from GetToplevelContentDocumentPresContext?");
+presContext->PresShell()->ScheduleImageVisibilityUpdate();
+return;
+}
+if (mHaveShutDown || mIsDestroying)
+return;
+if (mUpdateImageVisibilityEvent.IsPending())
+return;
+nsRefPtr<nsRunnableMethod<PresShell> > ev =
+NS_NewRunnableMethod(this, &PresShell::UpdateImageVisibility);
+if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+mUpdateImageVisibilityEvent = ev;
+}
+}
+void
+PresShell::EnsureImageInVisibleList(nsIImageLoadingContent* aImage)
+{
+if (AssumeAllImagesVisible()) {
+aImage->IncrementVisibleCount();
+return;
+}
+#ifdef DEBUG
+// if it has a frame make sure its in this presshell
+nsCOMPtr<nsIContent> content = do_QueryInterface(aImage);
+if (content) {
+PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
+MOZ_ASSERT(!shell || shell == this, "wrong shell");
+}
+#endif
+if (!mVisibleImages.Contains(aImage)) {
+mVisibleImages.PutEntry(aImage);
+aImage->IncrementVisibleCount();
+}
+}
+void
+PresShell::RemoveImageFromVisibleList(nsIImageLoadingContent* aImage)
+{
+#ifdef DEBUG
+// if it has a frame make sure its in this presshell
+nsCOMPtr<nsIContent> content = do_QueryInterface(aImage);
+if (content) {
+PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
+MOZ_ASSERT(!shell || shell == this, "wrong shell");
+}
+#endif
+if (AssumeAllImagesVisible()) {
+MOZ_ASSERT(mVisibleImages.Count() == 0, "shouldn't have any images in the table");
+return;
+}
+uint32_t count = mVisibleImages.Count();
+mVisibleImages.RemoveEntry(aImage);
+if (mVisibleImages.Count() < count) {
+// aImage was in the hashtable, so we need to decrement its visible count
+aImage->DecrementVisibleCount();
+}
+}
+class nsAutoNotifyDidPaint
+{
+public:
+nsAutoNotifyDidPaint(PresShell* aShell, uint32_t aFlags)
+: mShell(aShell), mFlags(aFlags)
+{
+}
+~nsAutoNotifyDidPaint()
+{
+mShell->GetPresContext()->NotifyDidPaintForSubtree(mFlags);
+}
+private:
+PresShell* mShell;
+uint32_t mFlags;
+};
+class AutoUpdateHitRegion
+{
+public:
+AutoUpdateHitRegion(PresShell* aShell, nsIFrame* aFrame)
+: mShell(aShell), mFrame(aFrame)
+{
+}
+~AutoUpdateHitRegion()
+{
+if (XRE_GetProcessType() != GeckoProcessType_Content ||
+!mFrame || !mShell) {
+return;
+}
+TabChild* tabChild = TabChild::GetFrom(mShell);
+if (!tabChild || !tabChild->GetUpdateHitRegion()) {
+return;
+}
+nsRegion region;
+nsDisplayListBuilder builder(mFrame,
+nsDisplayListBuilder::EVENT_DELIVERY,
+/* aBuildCert= */ false);
+nsDisplayList list;
+nsAutoTArray<nsIFrame*, 100> outFrames;
+nsDisplayItem::HitTestState hitTestState;
+nsRect bounds = mShell->GetPresContext()->GetVisibleArea();
+builder.EnterPresShell(mFrame, bounds);
+mFrame->BuildDisplayListForStackingContext(&builder, bounds, &list);
+builder.LeavePresShell(mFrame, bounds);
+list.HitTest(&builder, bounds, &hitTestState, &outFrames);
+list.DeleteAll();
+for (int32_t i = outFrames.Length() - 1; i >= 0; --i) {
+region.Or(region, nsLayoutUtils::TransformFrameRectToAncestor(
+outFrames[i], nsRect(nsPoint(0, 0), outFrames[i]->GetSize()), mFrame));
+}
+tabChild->UpdateHitRegion(region);
+}
+private:
+PresShell* mShell;
+nsIFrame* mFrame;
+};
+void
+PresShell::RestyleShadowRoot(ShadowRoot* aShadowRoot)
+{
+// Mark the children of the ShadowRoot as style changed but not
+// the ShadowRoot itself because it is a document fragment and does not
+// have a frame.
+ExplicitChildIterator iterator(aShadowRoot);
+for (nsIContent* child = iterator.GetNextChild();
+child;
+child = iterator.GetNextChild()) {
+if (child->IsElement()) {
+mChangedScopeStyleRoots.AppendElement(child->AsElement());
+}
+}
+}
+void
+PresShell::Paint(nsView*        aViewToPaint,
+const nsRegion& aDirtyRegion,
+uint32_t        aFlags)
+{
+PROFILER_LABEL("Paint", "PresShell::Paint");
+NS_ASSERTION(!mIsDestroying, "painting a destroyed PresShell");
+NS_ASSERTION(aViewToPaint, "null view");
+MOZ_ASSERT(!mImageVisibilityVisited, "should have been cleared");
+if (!mIsActive || mIsZombie) {
+return;
+}
+nsPresContext* presContext = GetPresContext();
+AUTO_LAYOUT_PHASE_ENTRY_POINT(presContext, Paint);
+nsIFrame* frame = aViewToPaint->GetFrame();
+bool isRetainingManager;
+LayerManager* layerManager =
+aViewToPaint->GetWidget()->GetLayerManager(&isRetainingManager);
+NS_ASSERTION(layerManager, "Must be in paint event");
+bool shouldInvalidate = layerManager->NeedsWidgetInvalidation();
+nsAutoNotifyDidPaint notifyDidPaint(this, aFlags);
+AutoUpdateHitRegion updateHitRegion(this, frame);
+// Whether or not we should set first paint when painting is
+// suppressed is debatable. For now we'll do it because
+// B2G relies on first paint to configure the viewport and
+// we only want to do that when we have real content to paint.
+// See Bug 798245
+if (mIsFirstPaint && !mPaintingSuppressed) {
+layerManager->SetIsFirstPaint();
+mIsFirstPaint = false;
+}
+layerManager->BeginTransaction();
+if (frame && isRetainingManager) {
+// Try to do an empty transaction, if the frame tree does not
+// need to be updated. Do not try to do an empty transaction on
+// a non-retained layer manager (like the BasicLayerManager that
+// draws the window title bar on Mac), because a) it won't work
+// and b) below we don't want to clear NS_FRAME_UPDATE_LAYER_TREE,
+// that will cause us to forget to update the real layer manager!
+if (!(aFlags & PAINT_LAYERS)) {
+if (layerManager->EndEmptyTransaction()) {
+return;
+}
+NS_WARNING("Must complete empty transaction when compositing!");
+}
+if (!(frame->GetStateBits() & NS_FRAME_UPDATE_LAYER_TREE) &&
+!mNextPaintCompressed) {
+NotifySubDocInvalidationFunc computeInvalidFunc =
+presContext->MayHavePaintEventListenerInSubDocument() ? nsPresContext::NotifySubDocInvalidation : 0;
+bool computeInvalidRect = computeInvalidFunc ||
+(layerManager->GetBackendType() == LayersBackend::LAYERS_BASIC);
+nsAutoPtr<LayerProperties> props(computeInvalidRect ?
+LayerProperties::CloneFrom(layerManager->GetRoot()) :
+nullptr);
+if (layerManager->EndEmptyTransaction((aFlags & PAINT_COMPOSITE) ?
+LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE)) {
+nsIntRegion invalid;
+if (props) {
+invalid = props->ComputeDifferences(layerManager->GetRoot(), computeInvalidFunc);
+} else {
+LayerProperties::ClearInvalidations(layerManager->GetRoot());
+}
+if (props) {
+if (!invalid.IsEmpty()) {
+nsIntRect bounds = invalid.GetBounds();
+nsRect rect(presContext->DevPixelsToAppUnits(bounds.x),
+presContext->DevPixelsToAppUnits(bounds.y),
+presContext->DevPixelsToAppUnits(bounds.width),
+presContext->DevPixelsToAppUnits(bounds.height));
+if (shouldInvalidate) {
+aViewToPaint->GetViewManager()->InvalidateViewNoSuppression(aViewToPaint, rect);
+}
+presContext->NotifyInvalidation(bounds, 0);
+}
+} else if (shouldInvalidate) {
+aViewToPaint->GetViewManager()->InvalidateView(aViewToPaint);
+}
+frame->UpdatePaintCountForPaintedPresShells();
+return;
+}
+}
+frame->RemoveStateBits(NS_FRAME_UPDATE_LAYER_TREE);
+}
+if (frame) {
+frame->ClearPresShellsFromLastPaint();
+}
+nscolor bgcolor = ComputeBackstopColor(aViewToPaint);
+uint32_t flags = nsLayoutUtils::PAINT_WIDGET_LAYERS | nsLayoutUtils::PAINT_EXISTING_TRANSACTION;
+if (!(aFlags & PAINT_COMPOSITE)) {
+flags |= nsLayoutUtils::PAINT_NO_COMPOSITE;
+}
+if (mNextPaintCompressed) {
+flags |= nsLayoutUtils::PAINT_COMPRESSED;
+mNextPaintCompressed = false;
+}
+if (frame) {
+// We can paint directly into the widget using its layer manager.
+nsLayoutUtils::PaintFrame(nullptr, frame, aDirtyRegion, bgcolor, flags);
+return;
+}
+nsRefPtr<ColorLayer> root = layerManager->CreateColorLayer();
+if (root) {
+nsPresContext* pc = GetPresContext();
+nsIntRect bounds =
+pc->GetVisibleArea().ToOutsidePixels(pc->AppUnitsPerDevPixel());
+bgcolor = NS_ComposeColors(bgcolor, mCanvasBackgroundColor);
+root->SetColor(bgcolor);
+root->SetVisibleRegion(bounds);
+layerManager->SetRoot(root);
+}
+layerManager->EndTransaction(nullptr, nullptr, (aFlags & PAINT_COMPOSITE) ?
+LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE);
+}
+// static
+void
+nsIPresShell::SetCapturingContent(nsIContent* aContent, uint8_t aFlags)
+{
+// If capture was set for pointer lock, don't unlock unless we are coming
+// out of pointer lock explicitly.
+if (!aContent && gCaptureInfo.mPointerLock &&
+!(aFlags & CAPTURE_POINTERLOCK)) {
+return;
+}
+NS_IF_RELEASE(gCaptureInfo.mContent);
+// only set capturing content if allowed or the CAPTURE_IGNOREALLOWED or
+// CAPTURE_POINTERLOCK flags are used.
+if ((aFlags & CAPTURE_IGNOREALLOWED) || gCaptureInfo.mAllowed ||
+(aFlags & CAPTURE_POINTERLOCK)) {
+if (aContent) {
+NS_ADDREF(gCaptureInfo.mContent = aContent);
+}
+// CAPTURE_POINTERLOCK is the same as CAPTURE_RETARGETTOELEMENT & CAPTURE_IGNOREALLOWED
+gCaptureInfo.mRetargetToElement = ((aFlags & CAPTURE_RETARGETTOELEMENT) != 0) ||
+((aFlags & CAPTURE_POINTERLOCK) != 0);
+gCaptureInfo.mPreventDrag = (aFlags & CAPTURE_PREVENTDRAG) != 0;
+gCaptureInfo.mPointerLock = (aFlags & CAPTURE_POINTERLOCK) != 0;
+}
+}
+/* static */ void
+nsIPresShell::SetPointerCapturingContent(uint32_t aPointerId, nsIContent* aContent)
+{
+nsIContent* content = GetPointerCapturingContent(aPointerId);
+PointerInfo* pointerInfo = nullptr;
+if (!content && gActivePointersIds->Get(aPointerId, &pointerInfo) &&
+pointerInfo &&
+nsIDOMMouseEvent::MOZ_SOURCE_MOUSE == pointerInfo->mPointerType) {
+SetCapturingContent(aContent, CAPTURE_PREVENTDRAG);
+}
+if (content) {
+// Releasing capture for given pointer.
+gPointerCaptureList->Remove(aPointerId);
+DispatchGotOrLostPointerCaptureEvent(false, aPointerId, content);
+// Need to check the state because a lostpointercapture listener
+// may have called SetPointerCapture
+if (GetPointerCapturingContent(aPointerId)) {
+return;
+}
+}
+gPointerCaptureList->Put(aPointerId, aContent);
+DispatchGotOrLostPointerCaptureEvent(true, aPointerId, aContent);
+}
+/* static */ void
+nsIPresShell::ReleasePointerCapturingContent(uint32_t aPointerId, nsIContent* aContent)
+{
+if (gActivePointersIds->Get(aPointerId)) {
+SetCapturingContent(nullptr, CAPTURE_PREVENTDRAG);
+}
+// Releasing capture for given pointer.
+gPointerCaptureList->Remove(aPointerId);
+DispatchGotOrLostPointerCaptureEvent(false, aPointerId, aContent);
+}
+/* static */ nsIContent*
+nsIPresShell::GetPointerCapturingContent(uint32_t aPointerId)
+{
+return gPointerCaptureList->GetWeak(aPointerId);
+}
+/* static */ bool
+nsIPresShell::GetPointerInfo(uint32_t aPointerId, bool& aActiveState)
+{
+PointerInfo* pointerInfo = nullptr;
+if (gActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
+aActiveState = pointerInfo->mActiveState;
+return true;
+}
+return false;
+}
+void
+PresShell::UpdateActivePointerState(WidgetGUIEvent* aEvent)
+{
+switch (aEvent->message) {
+case NS_MOUSE_ENTER:
+// In this case we have to know information about available mouse pointers
+if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
+gActivePointersIds->Put(mouseEvent->pointerId, new PointerInfo(false, mouseEvent->inputSource));
+}
+break;
+case NS_POINTER_DOWN:
+// In this case we switch pointer to active state
+if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
+gActivePointersIds->Put(pointerEvent->pointerId, new PointerInfo(true, pointerEvent->inputSource));
+}
+break;
+case NS_POINTER_UP:
+// In this case we remove information about pointer or turn off active state
+if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
+if(pointerEvent->inputSource != nsIDOMMouseEvent::MOZ_SOURCE_TOUCH) {
+gActivePointersIds->Put(pointerEvent->pointerId, new PointerInfo(false, pointerEvent->inputSource));
+} else {
+gActivePointersIds->Remove(pointerEvent->pointerId);
+}
+}
+break;
+case NS_MOUSE_EXIT:
+// In this case we have to remove information about disappeared mouse pointers
+if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
+gActivePointersIds->Remove(mouseEvent->pointerId);
+}
+break;
+}
+}
+nsIContent*
+PresShell::GetCurrentEventContent()
+{
+if (mCurrentEventContent &&
+mCurrentEventContent->GetCurrentDoc() != mDocument) {
+mCurrentEventContent = nullptr;
+mCurrentEventFrame = nullptr;
+}
+return mCurrentEventContent;
+}
+nsIFrame*
+PresShell::GetCurrentEventFrame()
+{
+if (MOZ_UNLIKELY(mIsDestroying)) {
+return nullptr;
+}
+// GetCurrentEventContent() makes sure the content is still in the
+// same document that this pres shell belongs to. If not, then the
+// frame shouldn't get an event, nor should we even assume its safe
+// to try and find the frame.
+nsIContent* content = GetCurrentEventContent();
+if (!mCurrentEventFrame && content) {
+mCurrentEventFrame = content->GetPrimaryFrame();
+MOZ_ASSERT(!mCurrentEventFrame ||
+mCurrentEventFrame->PresContext()->GetPresShell() == this);
+}
+return mCurrentEventFrame;
+}
+nsIFrame*
+PresShell::GetEventTargetFrame()
+{
+return GetCurrentEventFrame();
+}
+already_AddRefed<nsIContent>
+PresShell::GetEventTargetContent(WidgetEvent* aEvent)
+{
+nsCOMPtr<nsIContent> content = GetCurrentEventContent();
+if (!content) {
+nsIFrame* currentEventFrame = GetCurrentEventFrame();
+if (currentEventFrame) {
+currentEventFrame->GetContentForEvent(aEvent, getter_AddRefs(content));
+NS_ASSERTION(!content || content->GetCurrentDoc() == mDocument,
+"handing out content from a different doc");
+}
+}
+return content.forget();
+}
+void
+PresShell::PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent)
+{
+if (mCurrentEventFrame || mCurrentEventContent) {
+mCurrentEventFrameStack.InsertElementAt(0, mCurrentEventFrame);
+mCurrentEventContentStack.InsertObjectAt(mCurrentEventContent, 0);
+}
+mCurrentEventFrame = aFrame;
+mCurrentEventContent = aContent;
+}
+void
+PresShell::PopCurrentEventInfo()
+{
+mCurrentEventFrame = nullptr;
+mCurrentEventContent = nullptr;
+if (0 != mCurrentEventFrameStack.Length()) {
+mCurrentEventFrame = mCurrentEventFrameStack.ElementAt(0);
+mCurrentEventFrameStack.RemoveElementAt(0);
+mCurrentEventContent = mCurrentEventContentStack.ObjectAt(0);
+mCurrentEventContentStack.RemoveObjectAt(0);
+// Don't use it if it has moved to a different document.
+if (mCurrentEventContent &&
+mCurrentEventContent->GetCurrentDoc() != mDocument) {
+mCurrentEventContent = nullptr;
+mCurrentEventFrame = nullptr;
+}
+}
+}
+bool PresShell::InZombieDocument(nsIContent *aContent)
+{
+// If a content node points to a null document, or the document is not
+// attached to a window, then it is possibly in a zombie document,
+// about to be replaced by a newly loading document.
+// Such documents cannot handle DOM events.
+// It might actually be in a node not attached to any document,
+// in which case there is not parent presshell to retarget it to.
+nsIDocument *doc = aContent->GetDocument();
+return !doc || !doc->GetWindow();
+}
+already_AddRefed<nsPIDOMWindow>
+PresShell::GetRootWindow()
+{
+nsCOMPtr<nsPIDOMWindow> window =
+do_QueryInterface(mDocument->GetWindow());
+if (window) {
+nsCOMPtr<nsPIDOMWindow> rootWindow = window->GetPrivateRoot();
+NS_ASSERTION(rootWindow, "nsPIDOMWindow::GetPrivateRoot() returns NULL");
+return rootWindow.forget();
+}
+// If we don't have DOM window, we're zombie, we should find the root window
+// with our parent shell.
+nsCOMPtr<nsIPresShell> parent = GetParentPresShellForEventHandling();
+NS_ENSURE_TRUE(parent, nullptr);
+return parent->GetRootWindow();
+}
+already_AddRefed<nsIPresShell>
+PresShell::GetParentPresShellForEventHandling()
+{
+NS_ENSURE_TRUE(mPresContext, nullptr);
+// Now, find the parent pres shell and send the event there
+nsCOMPtr<nsIDocShellTreeItem> treeItem = mPresContext->GetDocShell();
+if (!treeItem) {
+treeItem = mForwardingContainer.get();
+}
+// Might have gone away, or never been around to start with
+NS_ENSURE_TRUE(treeItem, nullptr);
+nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
+treeItem->GetParent(getter_AddRefs(parentTreeItem));
+nsCOMPtr<nsIDocShell> parentDocShell = do_QueryInterface(parentTreeItem);
+NS_ENSURE_TRUE(parentDocShell && treeItem != parentTreeItem, nullptr);
+nsCOMPtr<nsIPresShell> parentPresShell = parentDocShell->GetPresShell();
+return parentPresShell.forget();
+}
+nsresult
+PresShell::RetargetEventToParent(WidgetGUIEvent* aEvent,
+nsEventStatus* aEventStatus)
+{
+// Send this events straight up to the parent pres shell.
+// We do this for keystroke events in zombie documents or if either a frame
+// or a root content is not present.
+// That way at least the UI key bindings can work.
+nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
+nsCOMPtr<nsIPresShell> parentPresShell = GetParentPresShellForEventHandling();
+NS_ENSURE_TRUE(parentPresShell, NS_ERROR_FAILURE);
+// Fake the event as though it's from the parent pres shell's root frame.
+return parentPresShell->HandleEvent(parentPresShell->GetRootFrame(), aEvent, true, aEventStatus);
+}
+void
+PresShell::DisableNonTestMouseEvents(bool aDisable)
+{
+sDisableNonTestMouseEvents = aDisable;
+}
+already_AddRefed<nsPIDOMWindow>
+PresShell::GetFocusedDOMWindowInOurWindow()
+{
+nsCOMPtr<nsPIDOMWindow> rootWindow = GetRootWindow();
+NS_ENSURE_TRUE(rootWindow, nullptr);
+nsCOMPtr<nsPIDOMWindow> focusedWindow;
+nsFocusManager::GetFocusedDescendant(rootWindow, true,
+getter_AddRefs(focusedWindow));
+return focusedWindow.forget();
+}
+void
+PresShell::RecordMouseLocation(WidgetGUIEvent* aEvent)
+{
+if (!mPresContext)
+return;
+if (!mPresContext->IsRoot()) {
+PresShell* rootPresShell = GetRootPresShell();
+if (rootPresShell) {
+rootPresShell->RecordMouseLocation(aEvent);
+}
+return;
+}
+if ((aEvent->message == NS_MOUSE_MOVE &&
+aEvent->AsMouseEvent()->reason == WidgetMouseEvent::eReal) ||
+aEvent->message == NS_MOUSE_ENTER ||
+aEvent->message == NS_MOUSE_BUTTON_DOWN ||
+aEvent->message == NS_MOUSE_BUTTON_UP) {
+nsIFrame* rootFrame = GetRootFrame();
+if (!rootFrame) {
+nsView* rootView = mViewManager->GetRootView();
+mMouseLocation = nsLayoutUtils::TranslateWidgetToView(mPresContext,
+aEvent->widget, LayoutDeviceIntPoint::ToUntyped(aEvent->refPoint),
+rootView);
+} else {
+mMouseLocation =
+nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, rootFrame);
+}
+#ifdef DEBUG_MOUSE_LOCATION
+if (aEvent->message == NS_MOUSE_ENTER)
+printf("[ps=%p]got mouse enter for %p\n",
+this, aEvent->widget);
+printf("[ps=%p]setting mouse location to (%d,%d)\n",
+this, mMouseLocation.x, mMouseLocation.y);
+#endif
+if (aEvent->message == NS_MOUSE_ENTER)
+SynthesizeMouseMove(false);
+} else if (aEvent->message == NS_MOUSE_EXIT) {
+// Although we only care about the mouse moving into an area for which this
+// pres shell doesn't receive mouse move events, we don't check which widget
+// the mouse exit was for since this seems to vary by platform.  Hopefully
+// this won't matter at all since we'll get the mouse move or enter after
+// the mouse exit when the mouse moves from one of our widgets into another.
+mMouseLocation = nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
+#ifdef DEBUG_MOUSE_LOCATION
+printf("[ps=%p]got mouse exit for %p\n",
+this, aEvent->widget);
+printf("[ps=%p]clearing mouse location\n",
+this);
+#endif
+}
+}
+static void
+EvictTouchPoint(nsRefPtr<dom::Touch>& aTouch,
+nsIDocument* aLimitToDocument = nullptr)
+{
+nsCOMPtr<nsINode> node(do_QueryInterface(aTouch->mTarget));
+if (node) {
+nsIDocument* doc = node->GetCurrentDoc();
+if (doc && (!aLimitToDocument || aLimitToDocument == doc)) {
+nsIPresShell* presShell = doc->GetShell();
+if (presShell) {
+nsIFrame* frame = presShell->GetRootFrame();
+if (frame) {
+nsPoint pt(aTouch->mRefPoint.x, aTouch->mRefPoint.y);
+nsCOMPtr<nsIWidget> widget = frame->GetView()->GetNearestWidget(&pt);
+if (widget) {
+WidgetTouchEvent event(true, NS_TOUCH_END, widget);
+event.widget = widget;
+event.time = PR_IntervalNow();
+event.touches.AppendElement(aTouch);
+nsEventStatus status;
+widget->DispatchEvent(&event, status);
+return;
+}
+}
+}
+}
+}
+if (!node || !aLimitToDocument || node->OwnerDoc() == aLimitToDocument) {
+// We couldn't dispatch touchend. Remove the touch from gCaptureTouchList
+// explicitly.
+nsIPresShell::gCaptureTouchList->Remove(aTouch->Identifier());
+}
+}
+static PLDHashOperator
+AppendToTouchList(const uint32_t& aKey, nsRefPtr<dom::Touch>& aData, void *aTouchList)
+{
+nsTArray< nsRefPtr<dom::Touch> >* touches =
+static_cast<nsTArray< nsRefPtr<dom::Touch> >*>(aTouchList);
+aData->mChanged = false;
+touches->AppendElement(aData);
+return PL_DHASH_NEXT;
+}
+void
+PresShell::EvictTouches()
+{
+nsTArray< nsRefPtr<dom::Touch> > touches;
+gCaptureTouchList->Enumerate(&AppendToTouchList, &touches);
+for (uint32_t i = 0; i < touches.Length(); ++i) {
+EvictTouchPoint(touches[i], mDocument);
+}
+}
+static PLDHashOperator
+FindAnyTarget(const uint32_t& aKey, nsRefPtr<dom::Touch>& aData,
+void* aAnyTarget)
+{
+if (aData) {
+dom::EventTarget* target = aData->Target();
+if (target) {
+nsCOMPtr<nsIContent>* content =
+static_cast<nsCOMPtr<nsIContent>*>(aAnyTarget);
+*content = do_QueryInterface(target);
+return PL_DHASH_STOP;
+}
+}
+return PL_DHASH_NEXT;
+}
+nsIFrame* GetNearestFrameContainingPresShell(nsIPresShell* aPresShell)
+{
+nsView* view = aPresShell->GetViewManager()->GetRootView();
+while (view && !view->GetFrame()) {
+view = view->GetParent();
+}
+nsIFrame* frame = nullptr;
+if (view) {
+frame = view->GetFrame();
+}
+return frame;
+}
+static bool
+FlushThrottledStyles(nsIDocument *aDocument, void *aData)
+{
+nsIPresShell* shell = aDocument->GetShell();
+if (shell && shell->IsVisible()) {
+nsPresContext* presContext = shell->GetPresContext();
+if (presContext) {
+presContext->TransitionManager()->UpdateAllThrottledStyles();
+presContext->AnimationManager()->UpdateAllThrottledStyles();
+}
+}
+return true;
+}
+static nsresult
+DispatchPointerFromMouseOrTouch(PresShell* aShell,
+nsIFrame* aFrame,
+WidgetGUIEvent* aEvent,
+bool aDontRetargetEvents,
+nsEventStatus* aStatus)
+{
+uint32_t pointerMessage = 0;
+if (aEvent->eventStructType == NS_MOUSE_EVENT) {
+WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
+// if it is not mouse then it is likely will come as touch event
+if (!mouseEvent->convertToPointer) {
+return NS_OK;
+}
+int16_t button = mouseEvent->button;
+switch (mouseEvent->message) {
+case NS_MOUSE_MOVE:
+if (mouseEvent->buttons == 0) {
+button = -1;
+}
+pointerMessage = NS_POINTER_MOVE;
+break;
+case NS_MOUSE_BUTTON_UP:
+pointerMessage = NS_POINTER_UP;
+break;
+case NS_MOUSE_BUTTON_DOWN:
+pointerMessage = NS_POINTER_DOWN;
+break;
+default:
+return NS_OK;
+}
+WidgetPointerEvent event(*mouseEvent);
+event.message = pointerMessage;
+event.button = button;
+event.pressure = event.buttons ?
+mouseEvent->pressure ? mouseEvent->pressure : 0.5f :
+0.0f;
+event.convertToPointer = mouseEvent->convertToPointer = false;
+aShell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus);
+} else if (aEvent->eventStructType == NS_TOUCH_EVENT) {
+WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+// loop over all touches and dispatch pointer events on each touch
+// copy the event
+switch (touchEvent->message) {
+case NS_TOUCH_MOVE:
+pointerMessage = NS_POINTER_MOVE;
+break;
+case NS_TOUCH_END:
+pointerMessage = NS_POINTER_UP;
+break;
+case NS_TOUCH_START:
+pointerMessage = NS_POINTER_DOWN;
+break;
+case NS_TOUCH_CANCEL:
+pointerMessage = NS_POINTER_CANCEL;
+break;
+default:
+return NS_OK;
+}
+for (uint32_t i = 0; i < touchEvent->touches.Length(); ++i) {
+mozilla::dom::Touch* touch = touchEvent->touches[i];
+if (!touch || !touch->convertToPointer) {
+continue;
+}
+WidgetPointerEvent event(touchEvent->mFlags.mIsTrusted, pointerMessage, touchEvent->widget);
+event.isPrimary = i == 0;
+event.pointerId = touch->Identifier();
+event.refPoint.x = touch->mRefPoint.x;
+event.refPoint.y = touch->mRefPoint.y;
+event.modifiers = touchEvent->modifiers;
+event.width = touch->RadiusX();
+event.height = touch->RadiusY();
+event.tiltX = touch->tiltX;
+event.tiltY = touch->tiltY;
+event.time = touchEvent->time;
+event.mFlags = touchEvent->mFlags;
+event.button = WidgetMouseEvent::eLeftButton;
+event.buttons = WidgetMouseEvent::eLeftButtonFlag;
+event.inputSource = nsIDOMMouseEvent::MOZ_SOURCE_TOUCH;
+event.convertToPointer = touch->convertToPointer = false;
+aShell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus);
+}
+}
+return NS_OK;
+}
+class ReleasePointerCaptureCaller
+{
+public:
+ReleasePointerCaptureCaller() :
+mPointerId(0),
+mContent(nullptr)
+{
+}
+~ReleasePointerCaptureCaller()
+{
+if (mContent) {
+nsIPresShell::ReleasePointerCapturingContent(mPointerId, mContent);
+}
+}
+void SetTarget(uint32_t aPointerId, nsIContent* aContent)
+{
+mPointerId = aPointerId;
+mContent = aContent;
+}
+private:
+int32_t mPointerId;
+nsCOMPtr<nsIContent> mContent;
+};
+nsresult
+PresShell::HandleEvent(nsIFrame* aFrame,
+WidgetGUIEvent* aEvent,
+bool aDontRetargetEvents,
+nsEventStatus* aEventStatus)
+{
+#ifdef MOZ_TASK_TRACER
+// Make touch events, mouse events and hardware key events to be the source
+// events of TaskTracer, and originate the rest correlation tasks from here.
+SourceEventType type = SourceEventType::UNKNOWN;
+if (WidgetTouchEvent* inputEvent = aEvent->AsTouchEvent()) {
+type = SourceEventType::TOUCH;
+} else if (WidgetMouseEvent* inputEvent = aEvent->AsMouseEvent()) {
+type = SourceEventType::MOUSE;
+} else if (WidgetKeyboardEvent* inputEvent = aEvent->AsKeyboardEvent()) {
+type = SourceEventType::KEY;
+}
+AutoSourceEvent taskTracerEvent(type);
+#endif
+if (sPointerEventEnabled) {
+DispatchPointerFromMouseOrTouch(this, aFrame, aEvent, aDontRetargetEvents, aEventStatus);
+}
+NS_ASSERTION(aFrame, "null frame");
+if (mIsDestroying ||
+(sDisableNonTestMouseEvents && !aEvent->mFlags.mIsSynthesizedForTests &&
+aEvent->HasMouseEventMessage())) {
+return NS_OK;
+}
+RecordMouseLocation(aEvent);
+if (sPointerEventEnabled) {
+UpdateActivePointerState(aEvent);
+}
+if (!nsContentUtils::IsSafeToRunScript())
+return NS_OK;
+nsIContent* capturingContent =
+(aEvent->HasMouseEventMessage() ||
+aEvent->eventStructType == NS_WHEEL_EVENT ? GetCapturingContent() :
+nullptr);
+nsCOMPtr<nsIDocument> retargetEventDoc;
+if (!aDontRetargetEvents) {
+// key and IME related events should not cross top level window boundary.
+// Basically, such input events should be fired only on focused widget.
+// However, some IMEs might need to clean up composition after focused
+// window is deactivated.  And also some tests on MozMill want to test key
+// handling on deactivated window because MozMill window can be activated
+// during tests.  So, there is no merit the events should be redirected to
+// active window.  So, the events should be handled on the last focused
+// content in the last focused DOM window in same top level window.
+// Note, if no DOM window has been focused yet, we can discard the events.
+if (aEvent->IsTargetedAtFocusedWindow()) {
+nsCOMPtr<nsPIDOMWindow> window = GetFocusedDOMWindowInOurWindow();
+// No DOM window in same top level window has not been focused yet,
+// discard the events.
+if (!window) {
+return NS_OK;
+}
+retargetEventDoc = window->GetExtantDoc();
+if (!retargetEventDoc)
+return NS_OK;
+} else if (capturingContent) {
+// if the mouse is being captured then retarget the mouse event at the
+// document that is being captured.
+retargetEventDoc = capturingContent->GetCurrentDoc();
+#ifdef ANDROID
+} else if (aEvent->eventStructType == NS_TOUCH_EVENT) {
+retargetEventDoc = GetTouchEventTargetDocument();
+#endif
+}
+if (retargetEventDoc) {
+nsCOMPtr<nsIPresShell> presShell = retargetEventDoc->GetShell();
+if (!presShell)
+return NS_OK;
+if (presShell != this) {
+nsIFrame* frame = presShell->GetRootFrame();
+if (!frame) {
+if (aEvent->message == NS_QUERY_TEXT_CONTENT ||
+aEvent->IsContentCommandEvent()) {
+return NS_OK;
+}
+frame = GetNearestFrameContainingPresShell(presShell);
+}
+if (!frame)
+return NS_OK;
+nsCOMPtr<nsIPresShell> shell = frame->PresContext()->GetPresShell();
+return shell->HandleEvent(frame, aEvent, true, aEventStatus);
+}
+}
+}
+if (aEvent->eventStructType == NS_KEY_EVENT &&
+mDocument && mDocument->EventHandlingSuppressed()) {
+if (aEvent->message == NS_KEY_DOWN) {
+mNoDelayedKeyEvents = true;
+} else if (!mNoDelayedKeyEvents) {
+DelayedEvent* event = new DelayedKeyEvent(aEvent->AsKeyboardEvent());
+if (!mDelayedEvents.AppendElement(event)) {
+delete event;
+}
+}
+return NS_OK;
+}
+nsIFrame* frame = aFrame;
+if (aEvent->IsUsingCoordinates()) {
+ReleasePointerCaptureCaller releasePointerCaptureCaller;
+if (nsLayoutUtils::AreAsyncAnimationsEnabled() && mDocument) {
+if (aEvent->eventStructType == NS_TOUCH_EVENT) {
+nsIDocument::UnlockPointer();
+}
+{  // scope for scriptBlocker.
+nsAutoScriptBlocker scriptBlocker;
+GetRootPresShell()->GetDocument()->
+EnumerateSubDocuments(FlushThrottledStyles, nullptr);
+}
+frame = GetNearestFrameContainingPresShell(this);
+}
+NS_WARN_IF_FALSE(frame, "Nothing to handle this event!");
+if (!frame)
+return NS_OK;
+nsPresContext* framePresContext = frame->PresContext();
+nsPresContext* rootPresContext = framePresContext->GetRootPresContext();
+NS_ASSERTION(rootPresContext == mPresContext->GetRootPresContext(),
+"How did we end up outside the connected prescontext/viewmanager hierarchy?");
+// If we aren't starting our event dispatch from the root frame of the root prescontext,
+// then someone must be capturing the mouse. In that case we don't want to search the popup
+// list.
+if (framePresContext == rootPresContext &&
+frame == mFrameConstructor->GetRootFrame()) {
+nsIFrame* popupFrame =
+nsLayoutUtils::GetPopupFrameForEventCoordinates(rootPresContext, aEvent);
+// If the popupFrame is an ancestor of the 'frame', the frame should
+// handle the event, otherwise, the popup should handle it.
+if (popupFrame &&
+!nsContentUtils::ContentIsCrossDocDescendantOf(
+framePresContext->GetPresShell()->GetDocument(),
+popupFrame->GetContent())) {
+frame = popupFrame;
+}
+}
+bool captureRetarget = false;
+if (capturingContent) {
+// If a capture is active, determine if the docshell is visible. If not,
+// clear the capture and target the mouse event normally instead. This
+// would occur if the mouse button is held down while a tab change occurs.
+// If the docshell is visible, look for a scrolling container.
+bool vis;
+nsCOMPtr<nsIBaseWindow> baseWin =
+do_QueryInterface(mPresContext->GetContainerWeak());
+if (baseWin && NS_SUCCEEDED(baseWin->GetVisibility(&vis)) && vis) {
+captureRetarget = gCaptureInfo.mRetargetToElement;
+if (!captureRetarget) {
+// A check was already done above to ensure that capturingContent is
+// in this presshell.
+NS_ASSERTION(capturingContent->GetCurrentDoc() == GetDocument(),
+"Unexpected document");
+nsIFrame* captureFrame = capturingContent->GetPrimaryFrame();
+if (captureFrame) {
+if (capturingContent->Tag() == nsGkAtoms::select &&
+capturingContent->IsHTML()) {
+// a dropdown <select> has a child in its selectPopupList and we should
+// capture on that instead.
+nsIFrame* childFrame = captureFrame->GetChildList(nsIFrame::kSelectPopupList).FirstChild();
+if (childFrame) {
+captureFrame = childFrame;
+}
+}
+// scrollable frames should use the scrolling container as
+// the root instead of the document
+nsIScrollableFrame* scrollFrame = do_QueryFrame(captureFrame);
+if (scrollFrame) {
+frame = scrollFrame->GetScrolledFrame();
+}
+}
+}
+}
+else {
+ClearMouseCapture(nullptr);
+capturingContent = nullptr;
+}
+}
+// all touch events except for touchstart use a captured target
+if (aEvent->eventStructType == NS_TOUCH_EVENT &&
+aEvent->message != NS_TOUCH_START) {
+captureRetarget = true;
+}
+WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
+bool isWindowLevelMouseExit = (aEvent->message == NS_MOUSE_EXIT) &&
+(mouseEvent && mouseEvent->exit == WidgetMouseEvent::eTopLevel);
+// Get the frame at the event point. However, don't do this if we're
+// capturing and retargeting the event because the captured frame will
+// be used instead below. Also keep using the root frame if we're dealing
+// with a window-level mouse exit event since we want to start sending
+// mouse out events at the root EventStateManager.
+if (!captureRetarget && !isWindowLevelMouseExit) {
+nsPoint eventPoint;
+uint32_t flags = 0;
+if (aEvent->message == NS_TOUCH_START) {
+flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
+WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+// if this is a continuing session, ensure that all these events are
+// in the same document by taking the target of the events already in
+// the capture list
+nsCOMPtr<nsIContent> anyTarget;
+if (gCaptureTouchList->Count() > 0 && touchEvent->touches.Length() > 1) {
+gCaptureTouchList->Enumerate(&FindAnyTarget, &anyTarget);
+} else {
+gPreventMouseEvents = false;
+}
+for (int32_t i = touchEvent->touches.Length(); i; ) {
+--i;
+dom::Touch* touch = touchEvent->touches[i];
+int32_t id = touch->Identifier();
+if (!gCaptureTouchList->Get(id, nullptr)) {
+// find the target for this touch
+eventPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
+touch->mRefPoint,
+frame);
+nsIFrame* target = FindFrameTargetedByInputEvent(aEvent,
+frame,
+eventPoint,
+flags);
+if (target && !anyTarget) {
+target->GetContentForEvent(aEvent, getter_AddRefs(anyTarget));
+while (anyTarget && !anyTarget->IsElement()) {
+anyTarget = anyTarget->GetParent();
+}
+touch->SetTarget(anyTarget);
+} else {
+nsIFrame* newTargetFrame = nullptr;
+for (nsIFrame* f = target; f;
+f = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(f)) {
+if (f->PresContext()->Document() == anyTarget->OwnerDoc()) {
+newTargetFrame = f;
+break;
+}
+// We must be in a subdocument so jump directly to the root frame.
+// GetParentOrPlaceholderForCrossDoc gets called immediately to
+// jump up to the containing document.
+f = f->PresContext()->GetPresShell()->GetRootFrame();
+}
+// if we couldn't find a target frame in the same document as
+// anyTarget, remove the touch from the capture touch list, as
+// well as the event->touches array. touchmove events that aren't
+// in the captured touch list will be discarded
+if (!newTargetFrame) {
+touchEvent->touches.RemoveElementAt(i);
+} else {
+target = newTargetFrame;
+nsCOMPtr<nsIContent> targetContent;
+target->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
+while (targetContent && !targetContent->IsElement()) {
+targetContent = targetContent->GetParent();
+}
+touch->SetTarget(targetContent);
+}
+}
+if (target) {
+frame = target;
+}
+} else {
+// This touch is an old touch, we need to ensure that is not
+// marked as changed and set its target correctly
+touch->mChanged = false;
+int32_t id = touch->Identifier();
+nsRefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
+if (oldTouch) {
+touch->SetTarget(oldTouch->mTarget);
+}
+}
+}
+} else {
+eventPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, frame);
+}
+if (mouseEvent && mouseEvent->eventStructType == NS_MOUSE_EVENT &&
+mouseEvent->ignoreRootScrollFrame) {
+flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
+}
+nsIFrame* target =
+FindFrameTargetedByInputEvent(aEvent, frame, eventPoint, flags);
+if (target) {
+frame = target;
+}
+}
+// if a node is capturing the mouse, check if the event needs to be
+// retargeted at the capturing content instead. This will be the case when
+// capture retargeting is being used, no frame was found or the frame's
+// content is not a descendant of the capturing content.
+if (capturingContent &&
+(gCaptureInfo.mRetargetToElement || !frame->GetContent() ||
+!nsContentUtils::ContentIsCrossDocDescendantOf(frame->GetContent(),
+capturingContent))) {
+// A check was already done above to ensure that capturingContent is
+// in this presshell.
+NS_ASSERTION(capturingContent->GetCurrentDoc() == GetDocument(),
+"Unexpected document");
+nsIFrame* capturingFrame = capturingContent->GetPrimaryFrame();
+if (capturingFrame) {
+frame = capturingFrame;
+}
+}
+if (aEvent->eventStructType == NS_POINTER_EVENT &&
+aEvent->message != NS_POINTER_DOWN) {
+if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
+uint32_t pointerId = pointerEvent->pointerId;
+nsIContent* pointerCapturingContent = GetPointerCapturingContent(pointerId);
+if (pointerCapturingContent) {
+if (nsIFrame* capturingFrame = pointerCapturingContent->GetPrimaryFrame()) {
+frame = capturingFrame;
+}
+if (pointerEvent->message == NS_POINTER_UP ||
+pointerEvent->message == NS_POINTER_CANCEL) {
+// Implicitly releasing capture for given pointer.
+// LOST_POINTER_CAPTURE should be send after NS_POINTER_UP or NS_POINTER_CANCEL.
+releasePointerCaptureCaller.SetTarget(pointerId, pointerCapturingContent);
+}
+}
+}
+}
+// Suppress mouse event if it's being targeted at an element inside
+// a document which needs events suppressed
+if (aEvent->eventStructType == NS_MOUSE_EVENT &&
+frame->PresContext()->Document()->EventHandlingSuppressed()) {
+if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
+mNoDelayedMouseEvents = true;
+} else if (!mNoDelayedMouseEvents && aEvent->message == NS_MOUSE_BUTTON_UP) {
+DelayedEvent* event = new DelayedMouseEvent(aEvent->AsMouseEvent());
+if (!mDelayedEvents.AppendElement(event)) {
+delete event;
+}
+}
+return NS_OK;
+}
+PresShell* shell =
+static_cast<PresShell*>(frame->PresContext()->PresShell());
+switch (aEvent->message) {
+case NS_TOUCH_MOVE:
+case NS_TOUCH_CANCEL:
+case NS_TOUCH_END: {
+// get the correct shell to dispatch to
+WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+nsTArray< nsRefPtr<dom::Touch> >& touches = touchEvent->touches;
+for (uint32_t i = 0; i < touches.Length(); ++i) {
+dom::Touch* touch = touches[i];
+if (!touch) {
+break;
+}
+nsRefPtr<dom::Touch> oldTouch =
+gCaptureTouchList->GetWeak(touch->Identifier());
+if (!oldTouch) {
+break;
+}
+nsCOMPtr<nsIContent> content =
+do_QueryInterface(oldTouch->Target());
+if (!content) {
+break;
+}
+nsIFrame* contentFrame = content->GetPrimaryFrame();
+if (!contentFrame) {
+break;
+}
+shell = static_cast<PresShell*>(
+contentFrame->PresContext()->PresShell());
+if (shell) {
+break;
+}
+}
+break;
+}
+}
+// Check if we have an active EventStateManager which isn't the
+// EventStateManager of the current PresContext.
+// If that is the case, and mouse is over some ancestor document,
+// forward event handling to the active document.
+// This way content can get mouse events even when
+// mouse is over the chrome or outside the window.
+//
+// Note, currently for backwards compatibility we don't forward mouse events
+// to the active document when mouse is over some subdocument.
+EventStateManager* activeESM =
+EventStateManager::GetActiveEventStateManager();
+if (activeESM && aEvent->HasMouseEventMessage() &&
+activeESM != shell->GetPresContext()->EventStateManager() &&
+static_cast<EventStateManager*>(activeESM)->GetPresContext()) {
+nsIPresShell* activeShell =
+static_cast<EventStateManager*>(activeESM)->GetPresContext()->
+GetPresShell();
+if (activeShell &&
+nsContentUtils::ContentIsCrossDocDescendantOf(activeShell->GetDocument(),
+shell->GetDocument())) {
+shell = static_cast<PresShell*>(activeShell);
+frame = shell->GetRootFrame();
+}
+}
+if (shell != this) {
+// Handle the event in the correct shell.
+// Prevent deletion until we're done with event handling (bug 336582).
+nsCOMPtr<nsIPresShell> kungFuDeathGrip(shell);
+// We pass the subshell's root frame as the frame to start from. This is
+// the only correct alternative; if the event was captured then it
+// must have been captured by us or some ancestor shell and we
+// now ask the subshell to dispatch it normally.
+return shell->HandlePositionedEvent(frame, aEvent, aEventStatus);
+}
+return HandlePositionedEvent(frame, aEvent, aEventStatus);
+}
+nsresult rv = NS_OK;
+if (frame) {
+PushCurrentEventInfo(nullptr, nullptr);
+// key and IME related events go to the focused frame in this DOM window.
+if (aEvent->IsTargetedAtFocusedContent()) {
+mCurrentEventContent = nullptr;
+nsCOMPtr<nsPIDOMWindow> window =
+do_QueryInterface(mDocument->GetWindow());
+nsCOMPtr<nsPIDOMWindow> focusedWindow;
+nsCOMPtr<nsIContent> eventTarget =
+nsFocusManager::GetFocusedDescendant(window, false,
+getter_AddRefs(focusedWindow));
+// otherwise, if there is no focused content or the focused content has
+// no frame, just use the root content. This ensures that key events
+// still get sent to the window properly if nothing is focused or if a
+// frame goes away while it is focused.
+if (!eventTarget || !eventTarget->GetPrimaryFrame()) {
+nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
+if (htmlDoc) {
+nsCOMPtr<nsIDOMHTMLElement> body;
+htmlDoc->GetBody(getter_AddRefs(body));
+eventTarget = do_QueryInterface(body);
+if (!eventTarget) {
+eventTarget = mDocument->GetRootElement();
+}
+} else {
+eventTarget = mDocument->GetRootElement();
+}
+}
+if (aEvent->message == NS_KEY_DOWN) {
+NS_IF_RELEASE(gKeyDownTarget);
+NS_IF_ADDREF(gKeyDownTarget = eventTarget);
+}
+else if ((aEvent->message == NS_KEY_PRESS || aEvent->message == NS_KEY_UP) &&
+gKeyDownTarget) {
+// If a different element is now focused for the keypress/keyup event
+// than what was focused during the keydown event, check if the new
+// focused element is not in a chrome document any more, and if so,
+// retarget the event back at the keydown target. This prevents a
+// content area from grabbing the focus from chrome in-between key
+// events.
+if (eventTarget &&
+nsContentUtils::IsChromeDoc(gKeyDownTarget->GetCurrentDoc()) !=
+nsContentUtils::IsChromeDoc(eventTarget->GetCurrentDoc())) {
+eventTarget = gKeyDownTarget;
+}
+if (aEvent->message == NS_KEY_UP) {
+NS_RELEASE(gKeyDownTarget);
+}
+}
+mCurrentEventFrame = nullptr;
+nsIDocument* targetDoc = eventTarget ? eventTarget->OwnerDoc() : nullptr;
+if (targetDoc && targetDoc != mDocument) {
+PopCurrentEventInfo();
+nsCOMPtr<nsIPresShell> shell = targetDoc->GetShell();
+if (shell) {
+rv = static_cast<PresShell*>(shell.get())->
+HandleRetargetedEvent(aEvent, aEventStatus, eventTarget);
+}
+return rv;
+} else {
+mCurrentEventContent = eventTarget;
+}
+if (!GetCurrentEventContent() || !GetCurrentEventFrame() ||
+InZombieDocument(mCurrentEventContent)) {
+rv = RetargetEventToParent(aEvent, aEventStatus);
+PopCurrentEventInfo();
+return rv;
+}
+} else {
+mCurrentEventFrame = frame;
+}
+if (GetCurrentEventFrame()) {
+rv = HandleEventInternal(aEvent, aEventStatus);
+}
+#ifdef DEBUG
+ShowEventTargetDebug();
+#endif
+PopCurrentEventInfo();
+} else {
+// Activation events need to be dispatched even if no frame was found, since
+// we don't want the focus to be out of sync.
+if (!NS_EVENT_NEEDS_FRAME(aEvent)) {
+mCurrentEventFrame = nullptr;
+return HandleEventInternal(aEvent, aEventStatus);
+}
+else if (aEvent->HasKeyEventMessage()) {
+// Keypress events in new blank tabs should not be completely thrown away.
+// Retarget them -- the parent chrome shell might make use of them.
+return RetargetEventToParent(aEvent, aEventStatus);
+}
+}
+return rv;
+}
+#ifdef ANDROID
+nsIDocument*
+PresShell::GetTouchEventTargetDocument()
+{
+nsPresContext* context = GetPresContext();
+if (!context || !context->IsRoot()) {
+return nullptr;
+}
+nsCOMPtr<nsIDocShellTreeItem> shellAsTreeItem = context->GetDocShell();
+if (!shellAsTreeItem) {
+return nullptr;
+}
+nsCOMPtr<nsIDocShellTreeOwner> owner;
+shellAsTreeItem->GetTreeOwner(getter_AddRefs(owner));
+if (!owner) {
+return nullptr;
+}
+// now get the primary content shell (active tab)
+nsCOMPtr<nsIDocShellTreeItem> item;
+owner->GetPrimaryContentShell(getter_AddRefs(item));
+nsCOMPtr<nsIDocShell> childDocShell = do_QueryInterface(item);
+nsCOMPtr<nsIDocument> result = do_GetInterface(childDocShell);
+return result;
+}
+#endif
+#ifdef DEBUG
+void
+PresShell::ShowEventTargetDebug()
+{
+if (nsFrame::GetShowEventTargetFrameBorder() &&
+GetCurrentEventFrame()) {
+if (mDrawEventTargetFrame) {
+mDrawEventTargetFrame->InvalidateFrame();
+}
+mDrawEventTargetFrame = mCurrentEventFrame;
+mDrawEventTargetFrame->InvalidateFrame();
+}
+}
+#endif
+nsresult
+PresShell::HandlePositionedEvent(nsIFrame* aTargetFrame,
+WidgetGUIEvent* aEvent,
+nsEventStatus* aEventStatus)
+{
+nsresult rv = NS_OK;
+PushCurrentEventInfo(nullptr, nullptr);
+mCurrentEventFrame = aTargetFrame;
+if (mCurrentEventFrame) {
+nsCOMPtr<nsIContent> targetElement;
+mCurrentEventFrame->GetContentForEvent(aEvent,
+getter_AddRefs(targetElement));
+// If there is no content for this frame, target it anyway.  Some
+// frames can be targeted but do not have content, particularly
+// windows with scrolling off.
+if (targetElement) {
+// Bug 103055, bug 185889: mouse events apply to *elements*, not all
+// nodes.  Thus we get the nearest element parent here.
+// XXX we leave the frame the same even if we find an element
+// parent, so that the text frame will receive the event (selection
+// and friends are the ones who care about that anyway)
+//
+// We use weak pointers because during this tight loop, the node
+// will *not* go away.  And this happens on every mousemove.
+while (targetElement && !targetElement->IsElement()) {
+targetElement = targetElement->GetParent();
+}
+// If we found an element, target it.  Otherwise, target *nothing*.
+if (!targetElement) {
+mCurrentEventContent = nullptr;
+mCurrentEventFrame = nullptr;
+} else if (targetElement != mCurrentEventContent) {
+mCurrentEventContent = targetElement;
+}
+}
+}
+if (GetCurrentEventFrame()) {
+rv = HandleEventInternal(aEvent, aEventStatus);
+}
+#ifdef DEBUG
+ShowEventTargetDebug();
+#endif
+PopCurrentEventInfo();
+return rv;
+}
+nsresult
+PresShell::HandleEventWithTarget(WidgetEvent* aEvent, nsIFrame* aFrame,
+nsIContent* aContent, nsEventStatus* aStatus)
+{
+#if DEBUG
+MOZ_ASSERT(!aFrame || aFrame->PresContext()->GetPresShell() == this,
+"wrong shell");
+if (aContent) {
+nsIDocument* doc = aContent->GetCurrentDoc();
+NS_ASSERTION(doc, "event for content that isn't in a document");
+NS_ASSERTION(!doc || doc->GetShell() == this, "wrong shell");
+}
+#endif
+NS_ENSURE_STATE(!aContent || aContent->GetCurrentDoc() == mDocument);
+PushCurrentEventInfo(aFrame, aContent);
+nsresult rv = HandleEventInternal(aEvent, aStatus);
+PopCurrentEventInfo();
+return rv;
+}
+nsresult
+PresShell::HandleEventInternal(WidgetEvent* aEvent, nsEventStatus* aStatus)
+{
+nsRefPtr<EventStateManager> manager = mPresContext->EventStateManager();
+nsresult rv = NS_OK;
+if (!NS_EVENT_NEEDS_FRAME(aEvent) || GetCurrentEventFrame()) {
+bool touchIsNew = false;
+bool isHandlingUserInput = false;
+// XXX How about IME events and input events for plugins?
+if (aEvent->mFlags.mIsTrusted) {
+switch (aEvent->message) {
+case NS_KEY_PRESS:
+case NS_KEY_DOWN:
+case NS_KEY_UP: {
+nsIDocument* doc = GetCurrentEventContent() ?
+mCurrentEventContent->OwnerDoc() : nullptr;
+nsIDocument* fullscreenAncestor = nullptr;
+if (aEvent->AsKeyboardEvent()->keyCode == NS_VK_ESCAPE) {
+if ((fullscreenAncestor = nsContentUtils::GetFullscreenAncestor(doc))) {
+// Prevent default action on ESC key press when exiting
+// DOM fullscreen mode. This prevents the browser ESC key
+// handler from stopping all loads in the document, which
+// would cause <video> loads to stop.
+aEvent->mFlags.mDefaultPrevented = true;
+aEvent->mFlags.mOnlyChromeDispatch = true;
+if (aEvent->message == NS_KEY_UP) {
+// ESC key released while in DOM fullscreen mode.
+// If fullscreen is running in content-only mode, exit the target
+// doctree branch from fullscreen, otherwise fully exit all
+// browser windows and documents from fullscreen mode.
+// Note: in the content-only fullscreen case, we pass the
+// fullscreenAncestor since |doc| may not actually be fullscreen
+// here, and ExitFullscreen() has no affect when passed a
+// non-fullscreen document.
+nsIDocument::ExitFullscreen(
+nsContentUtils::IsFullscreenApiContentOnly() ? fullscreenAncestor : nullptr,
+/* async */ true);
+}
+}
+nsCOMPtr<nsIDocument> pointerLockedDoc =
+do_QueryReferent(EventStateManager::sPointerLockedDoc);
+if (pointerLockedDoc) {
+aEvent->mFlags.mDefaultPrevented = true;
+aEvent->mFlags.mOnlyChromeDispatch = true;
+if (aEvent->message == NS_KEY_UP) {
+nsIDocument::UnlockPointer();
+}
+}
+}
+// Else not full-screen mode or key code is unrestricted, fall
+// through to normal handling.
+}
+case NS_MOUSE_BUTTON_DOWN:
+case NS_MOUSE_BUTTON_UP:
+isHandlingUserInput = true;
+break;
+case NS_TOUCH_START: {
+WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+// if there is only one touch in this touchstart event, assume that it is
+// the start of a new touch session and evict any old touches in the
+// queue
+if (touchEvent->touches.Length() == 1) {
+nsTArray< nsRefPtr<dom::Touch> > touches;
+gCaptureTouchList->Enumerate(&AppendToTouchList, (void *)&touches);
+for (uint32_t i = 0; i < touches.Length(); ++i) {
+EvictTouchPoint(touches[i]);
+}
+}
+// Add any new touches to the queue
+for (uint32_t i = 0; i < touchEvent->touches.Length(); ++i) {
+dom::Touch* touch = touchEvent->touches[i];
+int32_t id = touch->Identifier();
+if (!gCaptureTouchList->Get(id, nullptr)) {
+// If it is not already in the queue, it is a new touch
+touch->mChanged = true;
+}
+touch->mMessage = aEvent->message;
+gCaptureTouchList->Put(id, touch);
+}
+break;
+}
+case NS_TOUCH_CANCEL:
+case NS_TOUCH_END: {
+// Remove the changed touches
+// need to make sure we only remove touches that are ending here
+WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+nsTArray< nsRefPtr<dom::Touch> >& touches = touchEvent->touches;
+for (uint32_t i = 0; i < touches.Length(); ++i) {
+dom::Touch* touch = touches[i];
+if (!touch) {
+continue;
+}
+touch->mMessage = aEvent->message;
+touch->mChanged = true;
+int32_t id = touch->Identifier();
+nsRefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
+if (!oldTouch) {
+continue;
+}
+nsCOMPtr<EventTarget> targetPtr = oldTouch->mTarget;
+mCurrentEventContent = do_QueryInterface(targetPtr);
+touch->SetTarget(targetPtr);
+gCaptureTouchList->Remove(id);
+}
+// add any touches left in the touch list, but ensure changed=false
+gCaptureTouchList->Enumerate(&AppendToTouchList, (void *)&touches);
+break;
+}
+case NS_TOUCH_MOVE: {
+// Check for touches that changed. Mark them add to queue
+WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+nsTArray< nsRefPtr<dom::Touch> >& touches = touchEvent->touches;
+bool haveChanged = false;
+for (int32_t i = touches.Length(); i; ) {
+--i;
+dom::Touch* touch = touches[i];
+if (!touch) {
+continue;
+}
+int32_t id = touch->Identifier();
+touch->mMessage = aEvent->message;
+nsRefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
+if (!oldTouch) {
+touches.RemoveElementAt(i);
+continue;
+}
+if (!touch->Equals(oldTouch)) {
+touch->mChanged = true;
+haveChanged = true;
+}
+nsCOMPtr<dom::EventTarget> targetPtr = oldTouch->mTarget;
+if (!targetPtr) {
+touches.RemoveElementAt(i);
+continue;
+}
+touch->SetTarget(targetPtr);
+gCaptureTouchList->Put(id, touch);
+// if we're moving from touchstart to touchmove for this touch
+// we allow preventDefault to prevent mouse events
+if (oldTouch->mMessage != touch->mMessage) {
+touchIsNew = true;
+}
+}
+// is nothing has changed, we should just return
+if (!haveChanged) {
+if (gPreventMouseEvents) {
+*aStatus = nsEventStatus_eConsumeNoDefault;
+}
+return NS_OK;
+}
+break;
+}
+case NS_DRAGDROP_DROP:
+nsCOMPtr<nsIDragSession> session = nsContentUtils::GetDragSession();
+if (session) {
+bool onlyChromeDrop = false;
+session->GetOnlyChromeDrop(&onlyChromeDrop);
+if (onlyChromeDrop) {
+aEvent->mFlags.mOnlyChromeDispatch = true;
+}
+}
+break;
+}
+}
+if (aEvent->message == NS_CONTEXTMENU) {
+WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
+if (mouseEvent->context == WidgetMouseEvent::eContextMenuKey &&
+!AdjustContextMenuKeyEvent(mouseEvent)) {
+return NS_OK;
+}
+if (mouseEvent->IsShift()) {
+aEvent->mFlags.mOnlyChromeDispatch = true;
+aEvent->mFlags.mRetargetToNonNativeAnonymous = true;
+}
+}
+AutoHandlingUserInputStatePusher userInpStatePusher(isHandlingUserInput,
+aEvent, mDocument);
+if (aEvent->mFlags.mIsTrusted && aEvent->message == NS_MOUSE_MOVE) {
+nsIPresShell::AllowMouseCapture(
+EventStateManager::GetActiveEventStateManager() == manager);
+}
+nsAutoPopupStatePusher popupStatePusher(
+Event::GetEventPopupControlState(aEvent));
+// FIXME. If the event was reused, we need to clear the old target,
+// bug 329430
+aEvent->target = nullptr;
+// 1. Give event to event manager for pre event state changes and
+//    generation of synthetic events.
+rv = manager->PreHandleEvent(mPresContext, aEvent, mCurrentEventFrame, aStatus);
+// 2. Give event to the DOM for third party and JS use.
+if (NS_SUCCEEDED(rv)) {
+bool wasHandlingKeyBoardEvent =
+nsContentUtils::IsHandlingKeyBoardEvent();
+if (aEvent->eventStructType == NS_KEY_EVENT) {
+nsContentUtils::SetIsHandlingKeyBoardEvent(true);
+}
+if (aEvent->IsAllowedToDispatchDOMEvent()) {
+nsPresShellEventCB eventCB(this);
+if (aEvent->eventStructType == NS_TOUCH_EVENT) {
+DispatchTouchEvent(aEvent, aStatus, &eventCB, touchIsNew);
+} else {
+nsCOMPtr<nsINode> eventTarget = mCurrentEventContent.get();
+nsPresShellEventCB* eventCBPtr = &eventCB;
+if (!eventTarget) {
+nsCOMPtr<nsIContent> targetContent;
+if (mCurrentEventFrame) {
+rv = mCurrentEventFrame->
+GetContentForEvent(aEvent, getter_AddRefs(targetContent));
+}
+if (NS_SUCCEEDED(rv) && targetContent) {
+eventTarget = do_QueryInterface(targetContent);
+} else if (mDocument) {
+eventTarget = do_QueryInterface(mDocument);
+// If we don't have any content, the callback wouldn't probably
+// do nothing.
+eventCBPtr = nullptr;
+}
+}
+if (eventTarget) {
+if (aEvent->eventStructType == NS_COMPOSITION_EVENT ||
+aEvent->eventStructType == NS_TEXT_EVENT) {
+IMEStateManager::DispatchCompositionEvent(eventTarget,
+mPresContext, aEvent, aStatus, eventCBPtr);
+} else {
+EventDispatcher::Dispatch(eventTarget, mPresContext,
+aEvent, nullptr, aStatus, eventCBPtr);
+}
+}
+}
+}
+nsContentUtils::SetIsHandlingKeyBoardEvent(wasHandlingKeyBoardEvent);
+// 3. Give event to event manager for post event state changes and
+//    generation of synthetic events.
+if (!mIsDestroying && NS_SUCCEEDED(rv)) {
+rv = manager->PostHandleEvent(mPresContext, aEvent,
+GetCurrentEventFrame(), aStatus);
+}
+}
+if (aEvent->message == NS_MOUSE_BUTTON_UP) {
+// reset the capturing content now that the mouse button is up
+SetCapturingContent(nullptr, 0);
+} else if (aEvent->message == NS_MOUSE_MOVE) {
+nsIPresShell::AllowMouseCapture(false);
+}
+}
+return rv;
+}
+void
+nsIPresShell::DispatchGotOrLostPointerCaptureEvent(bool aIsGotCapture,
+uint32_t aPointerId,
+nsIContent* aCaptureTarget)
+{
+PointerEventInit init;
+init.mPointerId = aPointerId;
+init.mBubbles = true;
+nsRefPtr<mozilla::dom::PointerEvent> event;
+event = PointerEvent::Constructor(aCaptureTarget,
+aIsGotCapture
+? NS_LITERAL_STRING("gotpointercapture")
+: NS_LITERAL_STRING("lostpointercapture"),
+init);
+if (event) {
+bool dummy;
+aCaptureTarget->DispatchEvent(event->InternalDOMEvent(), &dummy);
+}
+}
+void
+PresShell::DispatchTouchEvent(WidgetEvent* aEvent,
+nsEventStatus* aStatus,
+nsPresShellEventCB* aEventCB,
+bool aTouchIsNew)
+{
+// calling preventDefault on touchstart or the first touchmove for a
+// point prevents mouse events
+bool canPrevent = aEvent->message == NS_TOUCH_START ||
+(aEvent->message == NS_TOUCH_MOVE && aTouchIsNew);
+bool preventDefault = false;
+nsEventStatus tmpStatus = nsEventStatus_eIgnore;
+WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+// loop over all touches and dispatch events on any that have changed
+for (uint32_t i = 0; i < touchEvent->touches.Length(); ++i) {
+dom::Touch* touch = touchEvent->touches[i];
+if (!touch || !touch->mChanged) {
+continue;
+}
+nsCOMPtr<EventTarget> targetPtr = touch->mTarget;
+nsCOMPtr<nsIContent> content = do_QueryInterface(targetPtr);
+if (!content) {
+continue;
+}
+nsIDocument* doc = content->OwnerDoc();
+nsIContent* capturingContent = GetCapturingContent();
+if (capturingContent) {
+if (capturingContent->OwnerDoc() != doc) {
+// Wrong document, don't dispatch anything.
+continue;
+}
+content = capturingContent;
+}
+// copy the event
+WidgetTouchEvent newEvent(touchEvent->mFlags.mIsTrusted,
+touchEvent->message, touchEvent->widget);
+newEvent.AssignTouchEventData(*touchEvent, false);
+newEvent.target = targetPtr;
+nsRefPtr<PresShell> contentPresShell;
+if (doc == mDocument) {
+contentPresShell = static_cast<PresShell*>(doc->GetShell());
+if (contentPresShell) {
+//XXXsmaug huge hack. Pushing possibly capturing content,
+//         even though event target is something else.
+contentPresShell->PushCurrentEventInfo(
+content->GetPrimaryFrame(), content);
+}
+}
+nsIPresShell *presShell = doc->GetShell();
+if (!presShell) {
+continue;
+}
+nsPresContext *context = presShell->GetPresContext();
+tmpStatus = nsEventStatus_eIgnore;
+EventDispatcher::Dispatch(targetPtr, context,
+&newEvent, nullptr, &tmpStatus, aEventCB);
+if (nsEventStatus_eConsumeNoDefault == tmpStatus ||
+newEvent.mFlags.mMultipleActionsPrevented) {
+preventDefault = true;
+}
+if (newEvent.mFlags.mMultipleActionsPrevented) {
+touchEvent->mFlags.mMultipleActionsPrevented = true;
+}
+if (contentPresShell) {
+contentPresShell->PopCurrentEventInfo();
+}
+}
+// if preventDefault was called on any of the events dispatched
+// and this is touchstart, or the first touchmove, widget should consume
+// other events that would be associated with this touch session
+if (preventDefault && canPrevent) {
+gPreventMouseEvents = true;
+}
+if (gPreventMouseEvents) {
+*aStatus = nsEventStatus_eConsumeNoDefault;
+} else {
+*aStatus = nsEventStatus_eIgnore;
+}
+}
+// Dispatch event to content only (NOT full processing)
+// See also HandleEventWithTarget which does full event processing.
+nsresult
+PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
+WidgetEvent* aEvent,
+nsEventStatus* aStatus)
+{
+nsresult rv = NS_OK;
+PushCurrentEventInfo(nullptr, aTargetContent);
+// Bug 41013: Check if the event should be dispatched to content.
+// It's possible that we are in the middle of destroying the window
+// and the js context is out of date. This check detects the case
+// that caused a crash in bug 41013, but there may be a better way
+// to handle this situation!
+nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
+if (container) {
+// Dispatch event to content
+rv = EventDispatcher::Dispatch(aTargetContent, mPresContext, aEvent,
+nullptr, aStatus);
+}
+PopCurrentEventInfo();
+return rv;
+}
+// See the method above.
+nsresult
+PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
+nsIDOMEvent* aEvent,
+nsEventStatus* aStatus)
+{
+nsresult rv = NS_OK;
+PushCurrentEventInfo(nullptr, aTargetContent);
+nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
+if (container) {
+rv = EventDispatcher::DispatchDOMEvent(aTargetContent, nullptr, aEvent,
+mPresContext, aStatus);
+}
+PopCurrentEventInfo();
+return rv;
+}
+bool
+PresShell::AdjustContextMenuKeyEvent(WidgetMouseEvent* aEvent)
+{
+#ifdef MOZ_XUL
+// if a menu is open, open the context menu relative to the active item on the menu.
+nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
+if (pm) {
+nsIFrame* popupFrame = pm->GetTopPopup(ePopupTypeMenu);
+if (popupFrame) {
+nsIFrame* itemFrame =
+(static_cast<nsMenuPopupFrame *>(popupFrame))->GetCurrentMenuItem();
+if (!itemFrame)
+itemFrame = popupFrame;
+nsCOMPtr<nsIWidget> widget = popupFrame->GetNearestWidget();
+aEvent->widget = widget;
+nsIntPoint widgetPoint = widget->WidgetToScreenOffset();
+aEvent->refPoint = LayoutDeviceIntPoint::FromUntyped(
+itemFrame->GetScreenRect().BottomLeft() - widgetPoint);
+mCurrentEventContent = itemFrame->GetContent();
+mCurrentEventFrame = itemFrame;
+return true;
+}
+}
+#endif
+// If we're here because of the key-equiv for showing context menus, we
+// have to twiddle with the NS event to make sure the context menu comes
+// up in the upper left of the relevant content area before we create
+// the DOM event. Since we never call InitMouseEvent() on the event,
+// the client X/Y will be 0,0. We can make use of that if the widget is null.
+// Use the root view manager's widget since it's most likely to have one,
+// and the coordinates returned by GetCurrentItemAndPositionForElement
+// are relative to the widget of the root of the root view manager.
+nsRootPresContext* rootPC = mPresContext->GetRootPresContext();
+aEvent->refPoint.x = 0;
+aEvent->refPoint.y = 0;
+if (rootPC) {
+rootPC->PresShell()->GetViewManager()->
+GetRootWidget(getter_AddRefs(aEvent->widget));
+if (aEvent->widget) {
+// default the refpoint to the topleft of our document
+nsPoint offset(0, 0);
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+if (rootFrame) {
+nsView* view = rootFrame->GetClosestView(&offset);
+offset += view->GetOffsetToWidget(aEvent->widget);
+aEvent->refPoint =
+LayoutDeviceIntPoint::FromAppUnitsToNearest(offset, mPresContext->AppUnitsPerDevPixel());
+}
+}
+} else {
+aEvent->widget = nullptr;
+}
+// see if we should use the caret position for the popup
+nsIntPoint caretPoint;
+// Beware! This may flush notifications via synchronous
+// ScrollSelectionIntoView.
+if (PrepareToUseCaretPosition(aEvent->widget, caretPoint)) {
+// caret position is good
+aEvent->refPoint = LayoutDeviceIntPoint::FromUntyped(caretPoint);
+return true;
+}
+// If we're here because of the key-equiv for showing context menus, we
+// have to reset the event target to the currently focused element. Get it
+// from the focus controller.
+nsCOMPtr<nsIDOMElement> currentFocus;
+nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+if (fm)
+fm->GetFocusedElement(getter_AddRefs(currentFocus));
+// Reset event coordinates relative to focused frame in view
+if (currentFocus) {
+nsCOMPtr<nsIContent> currentPointElement;
+GetCurrentItemAndPositionForElement(currentFocus,
+getter_AddRefs(currentPointElement),
+aEvent->refPoint,
+aEvent->widget);
+if (currentPointElement) {
+mCurrentEventContent = currentPointElement;
+mCurrentEventFrame = nullptr;
+GetCurrentEventFrame();
+}
+}
+return true;
+}
+// PresShell::PrepareToUseCaretPosition
+//
+//    This checks to see if we should use the caret position for popup context
+//    menus. Returns true if the caret position should be used, and the
+//    coordinates of that position is returned in aTargetPt. This function
+//    will also scroll the window as needed to make the caret visible.
+//
+//    The event widget should be the widget that generated the event, and
+//    whose coordinate system the resulting event's refPoint should be
+//    relative to.  The returned point is in device pixels realtive to the
+//    widget passed in.
+bool
+PresShell::PrepareToUseCaretPosition(nsIWidget* aEventWidget, nsIntPoint& aTargetPt)
+{
+nsresult rv;
+// check caret visibility
+nsRefPtr<nsCaret> caret = GetCaret();
+NS_ENSURE_TRUE(caret, false);
+bool caretVisible = false;
+rv = caret->GetCaretVisible(&caretVisible);
+if (NS_FAILED(rv) || ! caretVisible)
+return false;
+// caret selection, this is a temporary weak reference, so no refcounting is
+// needed
+nsISelection* domSelection = caret->GetCaretDOMSelection();
+NS_ENSURE_TRUE(domSelection, false);
+// since the match could be an anonymous textnode inside a
+// <textarea> or text <input>, we need to get the outer frame
+// note: frames are not refcounted
+nsIFrame* frame = nullptr; // may be nullptr
+nsCOMPtr<nsIDOMNode> node;
+rv = domSelection->GetFocusNode(getter_AddRefs(node));
+NS_ENSURE_SUCCESS(rv, false);
+NS_ENSURE_TRUE(node, false);
+nsCOMPtr<nsIContent> content(do_QueryInterface(node));
+if (content) {
+nsIContent* nonNative = content->FindFirstNonChromeOnlyAccessContent();
+content = nonNative;
+}
+if (content) {
+// It seems like ScrollSelectionIntoView should be enough, but it's
+// not. The problem is that scrolling the selection into view when it is
+// below the current viewport will align the top line of the frame exactly
+// with the bottom of the window. This is fine, BUT, the popup event causes
+// the control to be re-focused which does this exact call to
+// ScrollContentIntoView, which has a one-pixel disagreement of whether the
+// frame is actually in view. The result is that the frame is aligned with
+// the top of the window, but the menu is still at the bottom.
+//
+// Doing this call first forces the frame to be in view, eliminating the
+// problem. The only difference in the result is that if your cursor is in
+// an edit box below the current view, you'll get the edit box aligned with
+// the top of the window. This is arguably better behavior anyway.
+rv = ScrollContentIntoView(content,
+nsIPresShell::ScrollAxis(
+nsIPresShell::SCROLL_MINIMUM,
+nsIPresShell::SCROLL_IF_NOT_VISIBLE),
+nsIPresShell::ScrollAxis(
+nsIPresShell::SCROLL_MINIMUM,
+nsIPresShell::SCROLL_IF_NOT_VISIBLE),
+nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
+NS_ENSURE_SUCCESS(rv, false);
+frame = content->GetPrimaryFrame();
+NS_WARN_IF_FALSE(frame, "No frame for focused content?");
+}
+// Actually scroll the selection (ie caret) into view. Note that this must
+// be synchronous since we will be checking the caret position on the screen.
+//
+// Be easy about errors, and just don't scroll in those cases. Better to have
+// the correct menu at a weird place than the wrong menu.
+// After ScrollSelectionIntoView(), the pending notifications might be
+// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
+nsCOMPtr<nsISelectionController> selCon;
+if (frame)
+frame->GetSelectionController(GetPresContext(), getter_AddRefs(selCon));
+else
+selCon = static_cast<nsISelectionController *>(this);
+if (selCon) {
+rv = selCon->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
+nsISelectionController::SELECTION_FOCUS_REGION,
+nsISelectionController::SCROLL_SYNCHRONOUS);
+NS_ENSURE_SUCCESS(rv, false);
+}
+nsPresContext* presContext = GetPresContext();
+// get caret position relative to the closest view
+nsRect caretCoords;
+nsIFrame* caretFrame = caret->GetGeometry(domSelection, &caretCoords);
+if (!caretFrame)
+return false;
+nsPoint viewOffset;
+nsView* view = caretFrame->GetClosestView(&viewOffset);
+if (!view)
+return false;
+// and then get the caret coords relative to the event widget
+if (aEventWidget) {
+viewOffset += view->GetOffsetToWidget(aEventWidget);
+}
+caretCoords.MoveBy(viewOffset);
+// caret coordinates are in app units, convert to pixels
+aTargetPt.x =
+presContext->AppUnitsToDevPixels(caretCoords.x + caretCoords.width);
+aTargetPt.y =
+presContext->AppUnitsToDevPixels(caretCoords.y + caretCoords.height);
+// make sure rounding doesn't return a pixel which is outside the caret
+// (e.g. one line lower)
+aTargetPt.y -= 1;
+return true;
+}
+void
+PresShell::GetCurrentItemAndPositionForElement(nsIDOMElement *aCurrentEl,
+nsIContent** aTargetToUse,
+LayoutDeviceIntPoint& aTargetPt,
+nsIWidget *aRootWidget)
+{
+nsCOMPtr<nsIContent> focusedContent(do_QueryInterface(aCurrentEl));
+ScrollContentIntoView(focusedContent,
+ScrollAxis(),
+ScrollAxis(),
+nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
+nsPresContext* presContext = GetPresContext();
+bool istree = false, checkLineHeight = true;
+nscoord extraTreeY = 0;
+#ifdef MOZ_XUL
+// Set the position to just underneath the current item for multi-select
+// lists or just underneath the selected item for single-select lists. If
+// the element is not a list, or there is no selection, leave the position
+// as is.
+nsCOMPtr<nsIDOMXULSelectControlItemElement> item;
+nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelect =
+do_QueryInterface(aCurrentEl);
+if (multiSelect) {
+checkLineHeight = false;
+int32_t currentIndex;
+multiSelect->GetCurrentIndex(&currentIndex);
+if (currentIndex >= 0) {
+nsCOMPtr<nsIDOMXULElement> xulElement(do_QueryInterface(aCurrentEl));
+if (xulElement) {
+nsCOMPtr<nsIBoxObject> box;
+xulElement->GetBoxObject(getter_AddRefs(box));
+nsCOMPtr<nsITreeBoxObject> treeBox(do_QueryInterface(box));
+// Tree view special case (tree items have no frames)
+// Get the focused row and add its coordinates, which are already in pixels
+// XXX Boris, should we create a new interface so that this doesn't
+// need to know about trees? Something like nsINodelessChildCreator which
+// could provide the current focus coordinates?
+if (treeBox) {
+treeBox->EnsureRowIsVisible(currentIndex);
+int32_t firstVisibleRow, rowHeight;
+treeBox->GetFirstVisibleRow(&firstVisibleRow);
+treeBox->GetRowHeight(&rowHeight);
+extraTreeY += presContext->CSSPixelsToAppUnits(
+(currentIndex - firstVisibleRow + 1) * rowHeight);
+istree = true;
+nsCOMPtr<nsITreeColumns> cols;
+treeBox->GetColumns(getter_AddRefs(cols));
+if (cols) {
+nsCOMPtr<nsITreeColumn> col;
+cols->GetFirstColumn(getter_AddRefs(col));
+if (col) {
+nsCOMPtr<nsIDOMElement> colElement;
+col->GetElement(getter_AddRefs(colElement));
+nsCOMPtr<nsIContent> colContent(do_QueryInterface(colElement));
+if (colContent) {
+nsIFrame* frame = colContent->GetPrimaryFrame();
+if (frame) {
+extraTreeY += frame->GetSize().height;
+}
+}
+}
+}
+}
+else {
+multiSelect->GetCurrentItem(getter_AddRefs(item));
+}
+}
+}
+}
+else {
+// don't check menulists as the selected item will be inside a popup.
+nsCOMPtr<nsIDOMXULMenuListElement> menulist = do_QueryInterface(aCurrentEl);
+if (!menulist) {
+nsCOMPtr<nsIDOMXULSelectControlElement> select =
+do_QueryInterface(aCurrentEl);
+if (select) {
+checkLineHeight = false;
+select->GetSelectedItem(getter_AddRefs(item));
+}
+}
+}
+if (item)
+focusedContent = do_QueryInterface(item);
+#endif
+nsIFrame *frame = focusedContent->GetPrimaryFrame();
+if (frame) {
+NS_ASSERTION(frame->PresContext() == GetPresContext(),
+"handling event for focused content that is not in our document?");
+nsPoint frameOrigin(0, 0);
+// Get the frame's origin within its view
+nsView *view = frame->GetClosestView(&frameOrigin);
+NS_ASSERTION(view, "No view for frame");
+// View's origin relative the widget
+if (aRootWidget) {
+frameOrigin += view->GetOffsetToWidget(aRootWidget);
+}
+// Start context menu down and to the right from top left of frame
+// use the lineheight. This is a good distance to move the context
+// menu away from the top left corner of the frame. If we always
+// used the frame height, the context menu could end up far away,
+// for example when we're focused on linked images.
+// On the other hand, we want to use the frame height if it's less
+// than the current line height, so that the context menu appears
+// associated with the correct frame.
+nscoord extra = 0;
+if (!istree) {
+extra = frame->GetSize().height;
+if (checkLineHeight) {
+nsIScrollableFrame *scrollFrame =
+nsLayoutUtils::GetNearestScrollableFrame(frame);
+if (scrollFrame) {
+nsSize scrollAmount = scrollFrame->GetLineScrollAmount();
+nsIFrame* f = do_QueryFrame(scrollFrame);
+int32_t APD = presContext->AppUnitsPerDevPixel();
+int32_t scrollAPD = f->PresContext()->AppUnitsPerDevPixel();
+scrollAmount = scrollAmount.ConvertAppUnits(scrollAPD, APD);
+if (extra > scrollAmount.height) {
+extra = scrollAmount.height;
+}
+}
+}
+}
+aTargetPt.x = presContext->AppUnitsToDevPixels(frameOrigin.x);
+aTargetPt.y = presContext->AppUnitsToDevPixels(
+frameOrigin.y + extra + extraTreeY);
+}
+NS_IF_ADDREF(*aTargetToUse = focusedContent);
+}
+bool
+PresShell::ShouldIgnoreInvalidation()
+{
+return mPaintingSuppressed || !mIsActive || mIsNeverPainting;
+}
+void
+PresShell::WillPaint()
+{
+nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
+if (!rootPresContext) {
+// In some edge cases, such as when we don't have a root frame yet,
+// we can't find the root prescontext. There's nothing to do in that
+// case.
+return;
+}
+// Don't bother doing anything if some viewmanager in our tree is painting
+// while we still have painting suppressed or we are not active.
+if (mPaintingSuppressed || !mIsActive || !IsVisible()) {
+return;
+}
+rootPresContext->FlushWillPaintObservers();
+if (mIsDestroying)
+return;
+// Process reflows, if we have them, to reduce flicker due to invalidates and
+// reflow being interspersed.  Note that we _do_ allow this to be
+// interruptible; if we can't do all the reflows it's better to flicker a bit
+// than to freeze up.
+FlushPendingNotifications(ChangesToFlush(Flush_InterruptibleLayout, false));
+}
+void
+PresShell::WillPaintWindow()
+{
+nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
+if (rootPresContext != mPresContext) {
+// This could be a popup's presshell. We don't allow plugins in popups
+// so there's nothing to do here.
+return;
+}
+#ifndef XP_MACOSX
+rootPresContext->ApplyPluginGeometryUpdates();
+#endif
+}
+void
+PresShell::DidPaintWindow()
+{
+nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
+if (rootPresContext != mPresContext) {
+// This could be a popup's presshell. No point in notifying XPConnect
+// about compositing of popups.
+return;
+}
+if (nsContentUtils::XPConnect()) {
+nsContentUtils::XPConnect()->NotifyDidPaint();
+}
+}
+bool
+PresShell::IsVisible()
+{
+if (!mViewManager)
+return false;
+nsView* view = mViewManager->GetRootView();
+if (!view)
+return true;
+// inner view of subdoc frame
+view = view->GetParent();
+if (!view)
+return true;
+// subdoc view
+view = view->GetParent();
+if (!view)
+return true;
+nsIFrame* frame = view->GetFrame();
+if (!frame)
+return true;
+return frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY);
+}
+nsresult
+PresShell::GetAgentStyleSheets(nsCOMArray<nsIStyleSheet>& aSheets)
+{
+aSheets.Clear();
+int32_t sheetCount = mStyleSet->SheetCount(nsStyleSet::eAgentSheet);
+for (int32_t i = 0; i < sheetCount; ++i) {
+nsIStyleSheet *sheet = mStyleSet->StyleSheetAt(nsStyleSet::eAgentSheet, i);
+if (!aSheets.AppendObject(sheet))
+return NS_ERROR_OUT_OF_MEMORY;
+}
+return NS_OK;
+}
+nsresult
+PresShell::SetAgentStyleSheets(const nsCOMArray<nsIStyleSheet>& aSheets)
+{
+return mStyleSet->ReplaceSheets(nsStyleSet::eAgentSheet, aSheets);
+}
+nsresult
+PresShell::AddOverrideStyleSheet(nsIStyleSheet *aSheet)
+{
+return mStyleSet->PrependStyleSheet(nsStyleSet::eOverrideSheet, aSheet);
+}
+nsresult
+PresShell::RemoveOverrideStyleSheet(nsIStyleSheet *aSheet)
+{
+return mStyleSet->RemoveStyleSheet(nsStyleSet::eOverrideSheet, aSheet);
+}
+static void
+FreezeElement(nsIContent *aContent, void * /* unused */)
+{
+nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(aContent));
+if (olc) {
+olc->StopPluginInstance();
+}
+}
+static bool
+FreezeSubDocument(nsIDocument *aDocument, void *aData)
+{
+nsIPresShell *shell = aDocument->GetShell();
+if (shell)
+shell->Freeze();
+return true;
+}
+void
+PresShell::Freeze()
+{
+mUpdateImageVisibilityEvent.Revoke();
+MaybeReleaseCapturingContent();
+mDocument->EnumerateFreezableElements(FreezeElement, nullptr);
+if (mCaret) {
+mCaret->SetCaretVisible(false);
+}
+mPaintingSuppressed = true;
+if (mDocument) {
+mDocument->EnumerateSubDocuments(FreezeSubDocument, nullptr);
+}
+nsPresContext* presContext = GetPresContext();
+if (presContext &&
+presContext->RefreshDriver()->PresContext() == presContext) {
+presContext->RefreshDriver()->Freeze();
+}
+mFrozen = true;
+if (mDocument) {
+UpdateImageLockingState();
+}
+}
+void
+PresShell::FireOrClearDelayedEvents(bool aFireEvents)
+{
+mNoDelayedMouseEvents = false;
+mNoDelayedKeyEvents = false;
+if (!aFireEvents) {
+mDelayedEvents.Clear();
+return;
+}
+if (mDocument) {
+nsCOMPtr<nsIDocument> doc = mDocument;
+while (!mIsDestroying && mDelayedEvents.Length() &&
+!doc->EventHandlingSuppressed()) {
+nsAutoPtr<DelayedEvent> ev(mDelayedEvents[0].forget());
+mDelayedEvents.RemoveElementAt(0);
+ev->Dispatch();
+}
+if (!doc->EventHandlingSuppressed()) {
+mDelayedEvents.Clear();
+}
+}
+}
+static void
+ThawElement(nsIContent *aContent, void *aShell)
+{
+nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(aContent));
+if (olc) {
+olc->AsyncStartPluginInstance();
+}
+}
+static bool
+ThawSubDocument(nsIDocument *aDocument, void *aData)
+{
+nsIPresShell *shell = aDocument->GetShell();
+if (shell)
+shell->Thaw();
+return true;
+}
+void
+PresShell::Thaw()
+{
+nsPresContext* presContext = GetPresContext();
+if (presContext &&
+presContext->RefreshDriver()->PresContext() == presContext) {
+presContext->RefreshDriver()->Thaw();
+}
+mDocument->EnumerateFreezableElements(ThawElement, this);
+if (mDocument)
+mDocument->EnumerateSubDocuments(ThawSubDocument, nullptr);
+// Get the activeness of our presshell, as this might have changed
+// while we were in the bfcache
+QueryIsActive();
+// We're now unfrozen
+mFrozen = false;
+UpdateImageLockingState();
+UnsuppressPainting();
+}
+//--------------------------------------------------------
+// Start of protected and private methods on the PresShell
+//--------------------------------------------------------
+void
+PresShell::MaybeScheduleReflow()
+{
+ASSERT_REFLOW_SCHEDULED_STATE();
+if (mReflowScheduled || mIsDestroying || mIsReflowing ||
+mDirtyRoots.Length() == 0)
+return;
+if (!mPresContext->HasPendingInterrupt() || !ScheduleReflowOffTimer()) {
+ScheduleReflow();
+}
+ASSERT_REFLOW_SCHEDULED_STATE();
+}
+void
+PresShell::ScheduleReflow()
+{
+NS_PRECONDITION(!mReflowScheduled, "Why are we trying to schedule a reflow?");
+ASSERT_REFLOW_SCHEDULED_STATE();
+if (GetPresContext()->RefreshDriver()->AddLayoutFlushObserver(this)) {
+mReflowScheduled = true;
+}
+ASSERT_REFLOW_SCHEDULED_STATE();
+}
+nsresult
+PresShell::DidCauseReflow()
+{
+NS_ASSERTION(mChangeNestCount != 0, "Unexpected call to DidCauseReflow()");
+--mChangeNestCount;
+nsContentUtils::RemoveScriptBlocker();
+return NS_OK;
+}
+void
+PresShell::WillDoReflow()
+{
+// We just reflowed, tell the caret that its frame might have moved.
+// XXXbz that comment makes no sense
+if (mCaret) {
+mCaret->InvalidateOutsideCaret();
+}
+mPresContext->FlushUserFontSet();
+mFrameConstructor->BeginUpdate();
+mLastReflowStart = GetPerformanceNow();
+}
+void
+PresShell::DidDoReflow(bool aInterruptible, bool aWasInterrupted)
+{
+mFrameConstructor->EndUpdate();
+HandlePostedReflowCallbacks(aInterruptible);
+nsCOMPtr<nsIDocShell> docShell = mPresContext->GetDocShell();
+if (docShell) {
+DOMHighResTimeStamp now = GetPerformanceNow();
+docShell->NotifyReflowObservers(aInterruptible, mLastReflowStart, now);
+}
+if (sSynthMouseMove) {
+SynthesizeMouseMove(false);
+}
+if (mCaret) {
+// Update the caret's position now to account for any changes created by
+// the reflow.
+mCaret->InvalidateOutsideCaret();
+mCaret->UpdateCaretPosition();
+}
+if (!aWasInterrupted) {
+ClearReflowOnZoomPending();
+}
+}
+DOMHighResTimeStamp
+PresShell::GetPerformanceNow()
+{
+DOMHighResTimeStamp now = 0;
+nsPIDOMWindow* window = mDocument->GetInnerWindow();
+if (window) {
+nsPerformance* perf = window->GetPerformance();
+if (perf) {
+now = perf->Now();
+}
+}
+return now;
+}
+static PLDHashOperator
+MarkFramesDirtyToRoot(nsPtrHashKey<nsIFrame>* p, void* closure)
+{
+nsIFrame* target = static_cast<nsIFrame*>(closure);
+for (nsIFrame* f = p->GetKey(); f && !NS_SUBTREE_DIRTY(f);
+f = f->GetParent()) {
+f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
+if (f == target) {
+break;
+}
+}
+return PL_DHASH_NEXT;
+}
+void
+PresShell::sReflowContinueCallback(nsITimer* aTimer, void* aPresShell)
+{
+nsRefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
+NS_PRECONDITION(aTimer == self->mReflowContinueTimer, "Unexpected timer");
+self->mReflowContinueTimer = nullptr;
+self->ScheduleReflow();
+}
+bool
+PresShell::ScheduleReflowOffTimer()
+{
+NS_PRECONDITION(!mReflowScheduled, "Shouldn't get here");
+ASSERT_REFLOW_SCHEDULED_STATE();
+if (!mReflowContinueTimer) {
+mReflowContinueTimer = do_CreateInstance("@mozilla.org/timer;1");
+if (!mReflowContinueTimer ||
+NS_FAILED(mReflowContinueTimer->
+InitWithFuncCallback(sReflowContinueCallback, this, 30,
+nsITimer::TYPE_ONE_SHOT))) {
+return false;
+}
+}
+return true;
+}
+bool
+PresShell::DoReflow(nsIFrame* target, bool aInterruptible)
+{
+if (mIsZombie) {
+return true;
+}
+gfxTextPerfMetrics* tp = mPresContext->GetTextPerfMetrics();
+TimeStamp timeStart;
+if (tp) {
+tp->Accumulate();
+tp->reflowCount++;
+timeStart = TimeStamp::Now();
+}
+target->SchedulePaint();
+nsIFrame *parent = nsLayoutUtils::GetCrossDocParentFrame(target);
+while (parent) {
+nsSVGEffects::InvalidateDirectRenderingObservers(parent);
+parent = nsLayoutUtils::GetCrossDocParentFrame(parent);
+}
+nsAutoCString docURL("N/A");
+nsIURI *uri = mDocument->GetDocumentURI();
+if (uri)
+uri->GetSpec(docURL);
+PROFILER_LABEL_PRINTF("layout", "DoReflow", "(%s)", docURL.get());
+if (mReflowContinueTimer) {
+mReflowContinueTimer->Cancel();
+mReflowContinueTimer = nullptr;
+}
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+nsRefPtr<nsRenderingContext> rcx = CreateReferenceRenderingContext();
+#ifdef DEBUG
+mCurrentReflowRoot = target;
+#endif
+target->WillReflow(mPresContext);
+// If the target frame is the root of the frame hierarchy, then
+// use all the available space. If it's simply a `reflow root',
+// then use the target frame's size as the available space.
+nsSize size;
+if (target == rootFrame) {
+size = mPresContext->GetVisibleArea().Size();
+} else {
+size = target->GetSize();
+}
+NS_ASSERTION(!target->GetNextInFlow() && !target->GetPrevInFlow(),
+"reflow roots should never split");
+// Don't pass size directly to the reflow state, since a
+// constrained height implies page/column breaking.
+nsSize reflowSize(size.width, NS_UNCONSTRAINEDSIZE);
+nsHTMLReflowState reflowState(mPresContext, target, rcx, reflowSize,
+nsHTMLReflowState::CALLER_WILL_INIT);
+if (rootFrame == target) {
+reflowState.Init(mPresContext);
+// When the root frame is being reflowed with unconstrained height
+// (which happens when we're called from
+// nsDocumentViewer::SizeToContent), we're effectively doing a
+// vertical resize, since it changes the meaning of percentage
+// heights even if no heights actually changed.  The same applies
+// when we reflow again after that computation.  This is an unusual
+// case, and isn't caught by nsHTMLReflowState::InitResizeFlags.
+bool hasUnconstrainedHeight = size.height == NS_UNCONSTRAINEDSIZE;
+if (hasUnconstrainedHeight || mLastRootReflowHadUnconstrainedHeight) {
+reflowState.mFlags.mVResize = true;
+}
+mLastRootReflowHadUnconstrainedHeight = hasUnconstrainedHeight;
+} else {
+// Initialize reflow state with current used border and padding,
+// in case this was set specially by the parent frame when the reflow root
+// was reflowed by its parent.
+nsMargin currentBorder = target->GetUsedBorder();
+nsMargin currentPadding = target->GetUsedPadding();
+reflowState.Init(mPresContext, -1, -1, &currentBorder, &currentPadding);
+}
+// fix the computed height
+NS_ASSERTION(reflowState.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0),
+"reflow state should not set margin for reflow roots");
+if (size.height != NS_UNCONSTRAINEDSIZE) {
+nscoord computedHeight =
+size.height - reflowState.ComputedPhysicalBorderPadding().TopBottom();
+computedHeight = std::max(computedHeight, 0);
+reflowState.SetComputedHeight(computedHeight);
+}
+NS_ASSERTION(reflowState.ComputedWidth() ==
+size.width -
+reflowState.ComputedPhysicalBorderPadding().LeftRight(),
+"reflow state computed incorrect width");
+mPresContext->ReflowStarted(aInterruptible);
+mIsReflowing = true;
+nsReflowStatus status;
+nsHTMLReflowMetrics desiredSize(reflowState);
+target->Reflow(mPresContext, desiredSize, reflowState, status);
+// If an incremental reflow is initiated at a frame other than the
+// root frame, then its desired size had better not change!  If it's
+// initiated at the root, then the size better not change unless its
+// height was unconstrained to start with.
+nsRect boundsRelativeToTarget = nsRect(0, 0, desiredSize.Width(), desiredSize.Height());
+NS_ASSERTION((target == rootFrame && size.height == NS_UNCONSTRAINEDSIZE) ||
+(desiredSize.Width() == size.width &&
+desiredSize.Height() == size.height),
+"non-root frame's desired size changed during an "
+"incremental reflow");
+NS_ASSERTION(target == rootFrame ||
+desiredSize.VisualOverflow().IsEqualInterior(boundsRelativeToTarget),
+"non-root reflow roots must not have visible overflow");
+NS_ASSERTION(target == rootFrame ||
+desiredSize.ScrollableOverflow().IsEqualEdges(boundsRelativeToTarget),
+"non-root reflow roots must not have scrollable overflow");
+NS_ASSERTION(status == NS_FRAME_COMPLETE,
+"reflow roots should never split");
+target->SetSize(boundsRelativeToTarget.Size());
+// Always use boundsRelativeToTarget here, not desiredSize.GetVisualOverflowArea(),
+// because for root frames (where they could be different, since root frames
+// are allowed to have overflow) the root view bounds need to match the
+// viewport bounds; the view manager "window dimensions" code depends on it.
+nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, target,
+target->GetView(),
+boundsRelativeToTarget);
+nsContainerFrame::SyncWindowProperties(mPresContext, target,
+target->GetView(), rcx);
+target->DidReflow(mPresContext, nullptr, nsDidReflowStatus::FINISHED);
+if (target == rootFrame && size.height == NS_UNCONSTRAINEDSIZE) {
+mPresContext->SetVisibleArea(boundsRelativeToTarget);
+}
+#ifdef DEBUG
+mCurrentReflowRoot = nullptr;
+#endif
+NS_ASSERTION(mPresContext->HasPendingInterrupt() ||
+mFramesToDirty.Count() == 0,
+"Why do we need to dirty anything if not interrupted?");
+mIsReflowing = false;
+bool interrupted = mPresContext->HasPendingInterrupt();
+if (interrupted) {
+// Make sure target gets reflowed again.
+mFramesToDirty.EnumerateEntries(&MarkFramesDirtyToRoot, target);
+NS_ASSERTION(NS_SUBTREE_DIRTY(target), "Why is the target not dirty?");
+mDirtyRoots.AppendElement(target);
+mDocument->SetNeedLayoutFlush();
+// Clear mFramesToDirty after we've done the NS_SUBTREE_DIRTY(target)
+// assertion so that if it fails it's easier to see what's going on.
+#ifdef NOISY_INTERRUPTIBLE_REFLOW
+printf("mFramesToDirty.Count() == %u\n", mFramesToDirty.Count());
+#endif /* NOISY_INTERRUPTIBLE_REFLOW */
+mFramesToDirty.Clear();
+// Any FlushPendingNotifications with interruptible reflows
+// should be suppressed now. We don't want to do extra reflow work
+// before our reflow event happens.
+mSuppressInterruptibleReflows = true;
+MaybeScheduleReflow();
+}
+#ifdef PR_LOGGING
+// dump text perf metrics for reflows with significant text processing
+if (tp) {
+if (tp->current.numChars > 100) {
+TimeDuration reflowTime = TimeStamp::Now() - timeStart;
+LogTextPerfStats(tp, this, tp->current,
+reflowTime.ToMilliseconds(), eLog_reflow, nullptr);
+}
+tp->Accumulate();
+}
+#endif
+return !interrupted;
+}
+#ifdef DEBUG
+void
+PresShell::DoVerifyReflow()
+{
+if (GetVerifyReflowEnable()) {
+// First synchronously render what we have so far so that we can
+// see it.
+nsView* rootView = mViewManager->GetRootView();
+mViewManager->InvalidateView(rootView);
+FlushPendingNotifications(Flush_Layout);
+mInVerifyReflow = true;
+bool ok = VerifyIncrementalReflow();
+mInVerifyReflow = false;
+if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
+printf("ProcessReflowCommands: finished (%s)\n",
+ok ? "ok" : "failed");
+}
+if (!mDirtyRoots.IsEmpty()) {
+printf("XXX yikes! reflow commands queued during verify-reflow\n");
+}
+}
+}
+#endif
+// used with Telemetry metrics
+#define NS_LONG_REFLOW_TIME_MS    5000
+bool
+PresShell::ProcessReflowCommands(bool aInterruptible)
+{
+if (mDirtyRoots.IsEmpty() && !mShouldUnsuppressPainting) {
+// Nothing to do; bail out
+return true;
+}
+mozilla::TimeStamp timerStart = mozilla::TimeStamp::Now();
+bool interrupted = false;
+if (!mDirtyRoots.IsEmpty()) {
+#ifdef DEBUG
+if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
+printf("ProcessReflowCommands: begin incremental reflow\n");
+}
+#endif
+// If reflow is interruptible, then make a note of our deadline.
+const PRIntervalTime deadline = aInterruptible
+? PR_IntervalNow() + PR_MicrosecondsToInterval(gMaxRCProcessingTime)
+: (PRIntervalTime)0;
+// Scope for the reflow entry point
+{
+nsAutoScriptBlocker scriptBlocker;
+WillDoReflow();
+AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
+nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
+do {
+// Send an incremental reflow notification to the target frame.
+int32_t idx = mDirtyRoots.Length() - 1;
+nsIFrame *target = mDirtyRoots[idx];
+mDirtyRoots.RemoveElementAt(idx);
+if (!NS_SUBTREE_DIRTY(target)) {
+// It's not dirty anymore, which probably means the notification
+// was posted in the middle of a reflow (perhaps with a reflow
+// root in the middle).  Don't do anything.
+continue;
+}
+interrupted = !DoReflow(target, aInterruptible);
+// Keep going until we're out of reflow commands, or we've run
+// past our deadline, or we're interrupted.
+} while (!interrupted && !mDirtyRoots.IsEmpty() &&
+(!aInterruptible || PR_IntervalNow() < deadline));
+interrupted = !mDirtyRoots.IsEmpty();
+}
+// Exiting the scriptblocker might have killed us
+if (!mIsDestroying) {
+DidDoReflow(aInterruptible, interrupted);
+}
+// DidDoReflow might have killed us
+if (!mIsDestroying) {
+#ifdef DEBUG
+if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
+printf("\nPresShell::ProcessReflowCommands() finished: this=%p\n",
+(void*)this);
+}
+DoVerifyReflow();
+#endif
+// If any new reflow commands were enqueued during the reflow, schedule
+// another reflow event to process them.  Note that we want to do this
+// after DidDoReflow(), since that method can change whether there are
+// dirty roots around by flushing, and there's no point in posting a
+// reflow event just to have the flush revoke it.
+if (!mDirtyRoots.IsEmpty()) {
+MaybeScheduleReflow();
+// And tell our document that we might need flushing
+mDocument->SetNeedLayoutFlush();
+}
+}
+}
+if (!mIsDestroying && mShouldUnsuppressPainting &&
+mDirtyRoots.IsEmpty()) {
+// We only unlock if we're out of reflows.  It's pointless
+// to unlock if reflows are still pending, since reflows
+// are just going to thrash the frames around some more.  By
+// waiting we avoid an overeager "jitter" effect.
+mShouldUnsuppressPainting = false;
+UnsuppressAndInvalidate();
+}
+if (mDocument->GetRootElement()) {
+TimeDuration elapsed = TimeStamp::Now() - timerStart;
+int32_t intElapsed = int32_t(elapsed.ToMilliseconds());
+Telemetry::ID id;
+if (mDocument->GetRootElement()->IsXUL()) {
+id = mIsActive
+? Telemetry::XUL_FOREGROUND_REFLOW_MS
+: Telemetry::XUL_BACKGROUND_REFLOW_MS;
+} else {
+id = mIsActive
+? Telemetry::HTML_FOREGROUND_REFLOW_MS_2
+: Telemetry::HTML_BACKGROUND_REFLOW_MS_2;
+}
+Telemetry::Accumulate(id, intElapsed);
+if (intElapsed > NS_LONG_REFLOW_TIME_MS) {
+Telemetry::Accumulate(Telemetry::LONG_REFLOW_INTERRUPTIBLE,
+aInterruptible ? 1 : 0);
+}
+}
+return !interrupted;
+}
+void
+PresShell::WindowSizeMoveDone()
+{
+if (mPresContext) {
+EventStateManager::ClearGlobalActiveContent(nullptr);
+ClearMouseCapture(nullptr);
+}
+}
+#ifdef MOZ_XUL
+/*
+* It's better to add stuff to the |DidSetStyleContext| method of the
+* relevant frames than adding it here.  These methods should (ideally,
+* anyway) go away.
+*/
+// Return value says whether to walk children.
+typedef bool (* frameWalkerFn)(nsIFrame *aFrame, void *aClosure);
+static bool
+ReResolveMenusAndTrees(nsIFrame *aFrame, void *aClosure)
+{
+// Trees have a special style cache that needs to be flushed when
+// the theme changes.
+nsTreeBodyFrame *treeBody = do_QueryFrame(aFrame);
+if (treeBody)
+treeBody->ClearStyleAndImageCaches();
+// We deliberately don't re-resolve style on a menu's popup
+// sub-content, since doing so slows menus to a crawl.  That means we
+// have to special-case them on a skin switch, and ensure that the
+// popup frames just get destroyed completely.
+nsMenuFrame* menu = do_QueryFrame(aFrame);
+if (menu)
+menu->CloseMenu(true);
+return true;
+}
+static bool
+ReframeImageBoxes(nsIFrame *aFrame, void *aClosure)
+{
+nsStyleChangeList *list = static_cast<nsStyleChangeList*>(aClosure);
+if (aFrame->GetType() == nsGkAtoms::imageBoxFrame) {
+list->AppendChange(aFrame, aFrame->GetContent(),
+NS_STYLE_HINT_FRAMECHANGE);
+return false; // don't walk descendants
+}
+return true; // walk descendants
+}
+static void
+WalkFramesThroughPlaceholders(nsPresContext *aPresContext, nsIFrame *aFrame,
+frameWalkerFn aFunc, void *aClosure)
+{
+bool walkChildren = (*aFunc)(aFrame, aClosure);
+if (!walkChildren)
+return;
+nsIFrame::ChildListIterator lists(aFrame);
+for (; !lists.IsDone(); lists.Next()) {
+nsFrameList::Enumerator childFrames(lists.CurrentList());
+for (; !childFrames.AtEnd(); childFrames.Next()) {
+nsIFrame* child = childFrames.get();
+if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
+// only do frames that are in flow, and recur through the
+// out-of-flows of placeholders.
+WalkFramesThroughPlaceholders(aPresContext,
+nsPlaceholderFrame::GetRealFrameFor(child),
+aFunc, aClosure);
+}
+}
+}
+}
+#endif
+NS_IMETHODIMP
+PresShell::Observe(nsISupports* aSubject,
+const char* aTopic,
+const char16_t* aData)
+{
+#ifdef MOZ_XUL
+if (!nsCRT::strcmp(aTopic, "chrome-flush-skin-caches")) {
+nsIFrame *rootFrame = mFrameConstructor->GetRootFrame();
+// Need to null-check because "chrome-flush-skin-caches" can happen
+// at interesting times during startup.
+if (rootFrame) {
+NS_ASSERTION(mViewManager, "View manager must exist");
+nsWeakFrame weakRoot(rootFrame);
+// Have to make sure that the content notifications are flushed before we
+// start messing with the frame model; otherwise we can get content doubling.
+mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
+if (weakRoot.IsAlive()) {
+WalkFramesThroughPlaceholders(mPresContext, rootFrame,
+&ReResolveMenusAndTrees, nullptr);
+// Because "chrome:" URL equality is messy, reframe image box
+// frames (hack!).
+nsStyleChangeList changeList;
+WalkFramesThroughPlaceholders(mPresContext, rootFrame,
+ReframeImageBoxes, &changeList);
+// Mark ourselves as not safe to flush while we're doing frame
+// construction.
+{
+nsAutoScriptBlocker scriptBlocker;
+++mChangeNestCount;
+RestyleManager* restyleManager = mPresContext->RestyleManager();
+restyleManager->ProcessRestyledFrames(changeList);
+restyleManager->FlushOverflowChangedTracker();
+--mChangeNestCount;
+}
+}
+}
+return NS_OK;
+}
+#endif
+if (!nsCRT::strcmp(aTopic, "agent-sheet-added") && mStyleSet) {
+AddAgentSheet(aSubject);
+return NS_OK;
+}
+if (!nsCRT::strcmp(aTopic, "user-sheet-added") && mStyleSet) {
+AddUserSheet(aSubject);
+return NS_OK;
+}
+if (!nsCRT::strcmp(aTopic, "author-sheet-added") && mStyleSet) {
+AddAuthorSheet(aSubject);
+return NS_OK;
+}
+if (!nsCRT::strcmp(aTopic, "agent-sheet-removed") && mStyleSet) {
+RemoveSheet(nsStyleSet::eAgentSheet, aSubject);
+return NS_OK;
+}
+if (!nsCRT::strcmp(aTopic, "user-sheet-removed") && mStyleSet) {
+RemoveSheet(nsStyleSet::eUserSheet, aSubject);
+return NS_OK;
+}
+if (!nsCRT::strcmp(aTopic, "author-sheet-removed") && mStyleSet) {
+RemoveSheet(nsStyleSet::eDocSheet, aSubject);
+return NS_OK;
+}
+NS_WARNING("unrecognized topic in PresShell::Observe");
+return NS_ERROR_FAILURE;
+}
+bool
+nsIPresShell::AddRefreshObserverInternal(nsARefreshObserver* aObserver,
+mozFlushType aFlushType)
+{
+nsPresContext* presContext = GetPresContext();
+return presContext &&
+presContext->RefreshDriver()->AddRefreshObserver(aObserver, aFlushType);
+}
+/* virtual */ bool
+nsIPresShell::AddRefreshObserverExternal(nsARefreshObserver* aObserver,
+mozFlushType aFlushType)
+{
+return AddRefreshObserverInternal(aObserver, aFlushType);
+}
+bool
+nsIPresShell::RemoveRefreshObserverInternal(nsARefreshObserver* aObserver,
+mozFlushType aFlushType)
+{
+nsPresContext* presContext = GetPresContext();
+return presContext &&
+presContext->RefreshDriver()->RemoveRefreshObserver(aObserver, aFlushType);
+}
+/* virtual */ bool
+nsIPresShell::RemoveRefreshObserverExternal(nsARefreshObserver* aObserver,
+mozFlushType aFlushType)
+{
+return RemoveRefreshObserverInternal(aObserver, aFlushType);
+}
+/* virtual */ bool
+nsIPresShell::AddPostRefreshObserver(nsAPostRefreshObserver* aObserver)
+{
+nsPresContext* presContext = GetPresContext();
+if (!presContext) {
+return false;
+}
+presContext->RefreshDriver()->AddPostRefreshObserver(aObserver);
+return true;
+}
+/* virtual */ bool
+nsIPresShell::RemovePostRefreshObserver(nsAPostRefreshObserver* aObserver)
+{
+nsPresContext* presContext = GetPresContext();
+if (!presContext) {
+return false;
+}
+presContext->RefreshDriver()->RemovePostRefreshObserver(aObserver);
+return true;
+}
+//------------------------------------------------------
+// End of protected and private methods on the PresShell
+//------------------------------------------------------
+//------------------------------------------------------------------
+//-- Delayed event Classes Impls
+//------------------------------------------------------------------
+PresShell::DelayedInputEvent::DelayedInputEvent() :
+DelayedEvent(),
+mEvent(nullptr)
+{
+}
+PresShell::DelayedInputEvent::~DelayedInputEvent()
+{
+delete mEvent;
+}
+void
+PresShell::DelayedInputEvent::Dispatch()
+{
+if (!mEvent || !mEvent->widget) {
+return;
+}
+nsCOMPtr<nsIWidget> widget = mEvent->widget;
+nsEventStatus status;
+widget->DispatchEvent(mEvent, status);
+}
+PresShell::DelayedMouseEvent::DelayedMouseEvent(WidgetMouseEvent* aEvent) :
+DelayedInputEvent()
+{
+WidgetMouseEvent* mouseEvent =
+new WidgetMouseEvent(aEvent->mFlags.mIsTrusted,
+aEvent->message,
+aEvent->widget,
+aEvent->reason,
+aEvent->context);
+mouseEvent->AssignMouseEventData(*aEvent, false);
+mEvent = mouseEvent;
+}
+PresShell::DelayedKeyEvent::DelayedKeyEvent(WidgetKeyboardEvent* aEvent) :
+DelayedInputEvent()
+{
+WidgetKeyboardEvent* keyEvent =
+new WidgetKeyboardEvent(aEvent->mFlags.mIsTrusted,
+aEvent->message,
+aEvent->widget);
+keyEvent->AssignKeyEventData(*aEvent, false);
+keyEvent->mFlags.mIsSynthesizedForTests = aEvent->mFlags.mIsSynthesizedForTests;
+mEvent = keyEvent;
+}
+// Start of DEBUG only code
+#ifdef DEBUG
+static void
+LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg)
+{
+nsAutoString n1, n2;
+if (k1) {
+k1->GetFrameName(n1);
+} else {
+n1.Assign(NS_LITERAL_STRING("(null)"));
+}
+if (k2) {
+k2->GetFrameName(n2);
+} else {
+n2.Assign(NS_LITERAL_STRING("(null)"));
+}
+printf("verifyreflow: %s %p != %s %p  %s\n",
+NS_LossyConvertUTF16toASCII(n1).get(), (void*)k1,
+NS_LossyConvertUTF16toASCII(n2).get(), (void*)k2, aMsg);
+}
+static void
+LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
+const nsRect& r1, const nsRect& r2)
+{
+printf("VerifyReflow Error:\n");
+nsAutoString name;
+if (k1) {
+k1->GetFrameName(name);
+printf("  %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
+}
+printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
+if (k2) {
+k2->GetFrameName(name);
+printf("  %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
+}
+printf("{%d, %d, %d, %d}\n  %s\n",
+r2.x, r2.y, r2.width, r2.height, aMsg);
+}
+static void
+LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
+const nsIntRect& r1, const nsIntRect& r2)
+{
+printf("VerifyReflow Error:\n");
+nsAutoString name;
+if (k1) {
+k1->GetFrameName(name);
+printf("  %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
+}
+printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
+if (k2) {
+k2->GetFrameName(name);
+printf("  %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
+}
+printf("{%d, %d, %d, %d}\n  %s\n",
+r2.x, r2.y, r2.width, r2.height, aMsg);
+}
+static bool
+CompareTrees(nsPresContext* aFirstPresContext, nsIFrame* aFirstFrame,
+nsPresContext* aSecondPresContext, nsIFrame* aSecondFrame)
+{
+if (!aFirstPresContext || !aFirstFrame || !aSecondPresContext || !aSecondFrame)
+return true;
+// XXX Evil hack to reduce false positives; I can't seem to figure
+// out how to flush scrollbar changes correctly
+//if (aFirstFrame->GetType() == nsGkAtoms::scrollbarFrame)
+//  return true;
+bool ok = true;
+nsIFrame::ChildListIterator lists1(aFirstFrame);
+nsIFrame::ChildListIterator lists2(aSecondFrame);
+do {
+const nsFrameList& kids1 = !lists1.IsDone() ? lists1.CurrentList() : nsFrameList();
+const nsFrameList& kids2 = !lists2.IsDone() ? lists2.CurrentList() : nsFrameList();
+int32_t l1 = kids1.GetLength();
+int32_t l2 = kids2.GetLength();;
+if (l1 != l2) {
+ok = false;
+LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
+"child counts don't match: ");
+printf("%d != %d\n", l1, l2);
+if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
+break;
+}
+}
+nsIntRect r1, r2;
+nsView* v1, *v2;
+for (nsFrameList::Enumerator e1(kids1), e2(kids2);
+;
+e1.Next(), e2.Next()) {
+nsIFrame* k1 = e1.get();
+nsIFrame* k2 = e2.get();
+if (((nullptr == k1) && (nullptr != k2)) ||
+((nullptr != k1) && (nullptr == k2))) {
+ok = false;
+LogVerifyMessage(k1, k2, "child lists are different\n");
+break;
+}
+else if (nullptr != k1) {
+// Verify that the frames are the same size
+if (!k1->GetRect().IsEqualInterior(k2->GetRect())) {
+ok = false;
+LogVerifyMessage(k1, k2, "(frame rects)", k1->GetRect(), k2->GetRect());
+}
+// Make sure either both have views or neither have views; if they
+// do have views, make sure the views are the same size. If the
+// views have widgets, make sure they both do or neither does. If
+// they do, make sure the widgets are the same size.
+v1 = k1->GetView();
+v2 = k2->GetView();
+if (((nullptr == v1) && (nullptr != v2)) ||
+((nullptr != v1) && (nullptr == v2))) {
+ok = false;
+LogVerifyMessage(k1, k2, "child views are not matched\n");
+}
+else if (nullptr != v1) {
+if (!v1->GetBounds().IsEqualInterior(v2->GetBounds())) {
+LogVerifyMessage(k1, k2, "(view rects)", v1->GetBounds(), v2->GetBounds());
+}
+nsIWidget* w1 = v1->GetWidget();
+nsIWidget* w2 = v2->GetWidget();
+if (((nullptr == w1) && (nullptr != w2)) ||
+((nullptr != w1) && (nullptr == w2))) {
+ok = false;
+LogVerifyMessage(k1, k2, "child widgets are not matched\n");
+}
+else if (nullptr != w1) {
+w1->GetBounds(r1);
+w2->GetBounds(r2);
+if (!r1.IsEqualEdges(r2)) {
+LogVerifyMessage(k1, k2, "(widget rects)", r1, r2);
+}
+}
+}
+if (!ok && (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags))) {
+break;
+}
+// XXX Should perhaps compare their float managers.
+// Compare the sub-trees too
+if (!CompareTrees(aFirstPresContext, k1, aSecondPresContext, k2)) {
+ok = false;
+if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
+break;
+}
+}
+}
+else {
+break;
+}
+}
+if (!ok && (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags))) {
+break;
+}
+lists1.Next();
+lists2.Next();
+if (lists1.IsDone() != lists2.IsDone() ||
+(!lists1.IsDone() && lists1.CurrentID() != lists2.CurrentID())) {
+if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
+ok = false;
+}
+LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
+"child list names are not matched: ");
+fprintf(stdout, "%s != %s\n",
+!lists1.IsDone() ? mozilla::layout::ChildListName(lists1.CurrentID()) : "(null)",
+!lists2.IsDone() ? mozilla::layout::ChildListName(lists2.CurrentID()) : "(null)");
+break;
+}
+} while (ok && !lists1.IsDone());
+return ok;
+}
+#endif
+#if 0
+static nsIFrame*
+FindTopFrame(nsIFrame* aRoot)
+{
+if (aRoot) {
+nsIContent* content = aRoot->GetContent();
+if (content) {
+nsIAtom* tag;
+content->GetTag(tag);
+if (nullptr != tag) {
+NS_RELEASE(tag);
+return aRoot;
+}
+}
+// Try one of the children
+nsIFrame* kid = aRoot->GetFirstPrincipalChild();
+while (nullptr != kid) {
+nsIFrame* result = FindTopFrame(kid);
+if (nullptr != result) {
+return result;
+}
+kid = kid->GetNextSibling();
+}
+}
+return nullptr;
+}
+#endif
+#ifdef DEBUG
+nsStyleSet*
+PresShell::CloneStyleSet(nsStyleSet* aSet)
+{
+nsStyleSet *clone = new nsStyleSet();
+int32_t i, n = aSet->SheetCount(nsStyleSet::eOverrideSheet);
+for (i = 0; i < n; i++) {
+nsIStyleSheet* ss = aSet->StyleSheetAt(nsStyleSet::eOverrideSheet, i);
+if (ss)
+clone->AppendStyleSheet(nsStyleSet::eOverrideSheet, ss);
+}
+// The document expects to insert document stylesheets itself
+#if 0
+n = aSet->SheetCount(nsStyleSet::eDocSheet);
+for (i = 0; i < n; i++) {
+nsIStyleSheet* ss = aSet->StyleSheetAt(nsStyleSet::eDocSheet, i);
+if (ss)
+clone->AddDocStyleSheet(ss, mDocument);
+}
+#endif
+n = aSet->SheetCount(nsStyleSet::eUserSheet);
+for (i = 0; i < n; i++) {
+nsIStyleSheet* ss = aSet->StyleSheetAt(nsStyleSet::eUserSheet, i);
+if (ss)
+clone->AppendStyleSheet(nsStyleSet::eUserSheet, ss);
+}
+n = aSet->SheetCount(nsStyleSet::eAgentSheet);
+for (i = 0; i < n; i++) {
+nsIStyleSheet* ss = aSet->StyleSheetAt(nsStyleSet::eAgentSheet, i);
+if (ss)
+clone->AppendStyleSheet(nsStyleSet::eAgentSheet, ss);
+}
+return clone;
+}
+#ifdef DEBUG_Eli
+static nsresult
+DumpToPNG(nsIPresShell* shell, nsAString& name) {
+int32_t width=1000, height=1000;
+nsRect r(0, 0, shell->GetPresContext()->DevPixelsToAppUnits(width),
+shell->GetPresContext()->DevPixelsToAppUnits(height));
+nsRefPtr<gfxImageSurface> imgSurface =
+new gfxImageSurface(gfxIntSize(width, height),
+gfxImageFormat::ARGB32);
+nsRefPtr<gfxContext> imgContext = new gfxContext(imgSurface);
+nsRefPtr<gfxASurface> surface =
+gfxPlatform::GetPlatform()->
+CreateOffscreenSurface(IntSize(width, height),
+gfxASurface::ContentFromFormat(gfxImageFormat::ARGB32));
+NS_ENSURE_TRUE(surface, NS_ERROR_OUT_OF_MEMORY);
+nsRefPtr<gfxContext> context = new gfxContext(surface);
+shell->RenderDocument(r, 0, NS_RGB(255, 255, 0), context);
+imgContext->DrawSurface(surface, gfxSize(width, height));
+nsCOMPtr<imgIEncoder> encoder = do_CreateInstance("@mozilla.org/image/encoder;2?type=image/png");
+NS_ENSURE_TRUE(encoder, NS_ERROR_FAILURE);
+encoder->InitFromData(imgSurface->Data(), imgSurface->Stride() * height,
+width, height, imgSurface->Stride(),
+imgIEncoder::INPUT_FORMAT_HOSTARGB, EmptyString());
+// XXX not sure if this is the right way to write to a file
+nsCOMPtr<nsIFile> file = do_CreateInstance("@mozilla.org/file/local;1");
+NS_ENSURE_TRUE(file, NS_ERROR_FAILURE);
+rv = file->InitWithPath(name);
+NS_ENSURE_SUCCESS(rv, rv);
+uint64_t length64;
+rv = encoder->Available(&length64);
+NS_ENSURE_SUCCESS(rv, rv);
+if (length64 > UINT32_MAX)
+return NS_ERROR_FILE_TOO_BIG;
+uint32_t length = (uint32_t)length64;
+nsCOMPtr<nsIOutputStream> outputStream;
+rv = NS_NewLocalFileOutputStream(getter_AddRefs(outputStream), file);
+NS_ENSURE_SUCCESS(rv, rv);
+nsCOMPtr<nsIOutputStream> bufferedOutputStream;
+rv = NS_NewBufferedOutputStream(getter_AddRefs(bufferedOutputStream),
+outputStream, length);
+NS_ENSURE_SUCCESS(rv, rv);
+uint32_t numWritten;
+rv = bufferedOutputStream->WriteFrom(encoder, length, &numWritten);
+NS_ENSURE_SUCCESS(rv, rv);
+return NS_OK;
+}
+#endif
+// After an incremental reflow, we verify the correctness by doing a
+// full reflow into a fresh frame tree.
+bool
+PresShell::VerifyIncrementalReflow()
+{
+if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
+printf("Building Verification Tree...\n");
+}
+// Create a presentation context to view the new frame tree
+nsRefPtr<nsPresContext> cx =
+new nsRootPresContext(mDocument, mPresContext->IsPaginated() ?
+nsPresContext::eContext_PrintPreview :
+nsPresContext::eContext_Galley);
+NS_ENSURE_TRUE(cx, false);
+nsDeviceContext *dc = mPresContext->DeviceContext();
+nsresult rv = cx->Init(dc);
+NS_ENSURE_SUCCESS(rv, false);
+// Get our scrolling preference
+nsView* rootView = mViewManager->GetRootView();
+NS_ENSURE_TRUE(rootView->HasWidget(), false);
+nsIWidget* parentWidget = rootView->GetWidget();
+// Create a new view manager.
+nsRefPtr<nsViewManager> vm = new nsViewManager();
+NS_ENSURE_TRUE(vm, false);
+rv = vm->Init(dc);
+NS_ENSURE_SUCCESS(rv, false);
+// Create a child window of the parent that is our "root view/window"
+// Create a view
+nsRect tbounds = mPresContext->GetVisibleArea();
+nsView* view = vm->CreateView(tbounds, nullptr);
+NS_ENSURE_TRUE(view, false);
+//now create the widget for the view
+rv = view->CreateWidgetForParent(parentWidget, nullptr, true);
+NS_ENSURE_SUCCESS(rv, false);
+// Setup hierarchical relationship in view manager
+vm->SetRootView(view);
+// Make the new presentation context the same size as our
+// presentation context.
+nsRect r = mPresContext->GetVisibleArea();
+cx->SetVisibleArea(r);
+// Create a new presentation shell to view the document. Use the
+// exact same style information that this document has.
+nsAutoPtr<nsStyleSet> newSet(CloneStyleSet(mStyleSet));
+nsCOMPtr<nsIPresShell> sh = mDocument->CreateShell(cx, vm, newSet);
+NS_ENSURE_TRUE(sh, false);
+newSet.forget();
+// Note that after we create the shell, we must make sure to destroy it
+sh->SetVerifyReflowEnable(false); // turn off verify reflow while we're reflowing the test frame tree
+vm->SetPresShell(sh);
+{
+nsAutoCauseReflowNotifier crNotifier(this);
+sh->Initialize(r.width, r.height);
+}
+mDocument->BindingManager()->ProcessAttachedQueue();
+sh->FlushPendingNotifications(Flush_Layout);
+sh->SetVerifyReflowEnable(true);  // turn on verify reflow again now that we're done reflowing the test frame tree
+// Force the non-primary presshell to unsuppress; it doesn't want to normally
+// because it thinks it's hidden
+((PresShell*)sh.get())->mPaintingSuppressed = false;
+if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
+printf("Verification Tree built, comparing...\n");
+}
+// Now that the document has been reflowed, use its frame tree to
+// compare against our frame tree.
+nsIFrame* root1 = mFrameConstructor->GetRootFrame();
+nsIFrame* root2 = sh->GetRootFrame();
+bool ok = CompareTrees(mPresContext, root1, cx, root2);
+if (!ok && (VERIFY_REFLOW_NOISY & gVerifyReflowFlags)) {
+printf("Verify reflow failed, primary tree:\n");
+root1->List(stdout, 0);
+printf("Verification tree:\n");
+root2->List(stdout, 0);
+}
+#ifdef DEBUG_Eli
+// Sample code for dumping page to png
+// XXX Needs to be made more flexible
+if (!ok) {
+nsString stra;
+static int num = 0;
+stra.AppendLiteral("C:\\mozilla\\mozilla\\debug\\filea");
+stra.AppendInt(num);
+stra.AppendLiteral(".png");
+DumpToPNG(sh, stra);
+nsString strb;
+strb.AppendLiteral("C:\\mozilla\\mozilla\\debug\\fileb");
+strb.AppendInt(num);
+strb.AppendLiteral(".png");
+DumpToPNG(this, strb);
+++num;
+}
+#endif
+sh->EndObservingDocument();
+sh->Destroy();
+if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
+printf("Finished Verifying Reflow...\n");
+}
+return ok;
+}
+// Layout debugging hooks
+void
+PresShell::ListStyleContexts(nsIFrame *aRootFrame, FILE *out, int32_t aIndent)
+{
+nsStyleContext *sc = aRootFrame->StyleContext();
+if (sc)
+sc->List(out, aIndent);
+}
+void
+PresShell::ListStyleSheets(FILE *out, int32_t aIndent)
+{
+int32_t sheetCount = mStyleSet->SheetCount(nsStyleSet::eDocSheet);
+for (int32_t i = 0; i < sheetCount; ++i) {
+mStyleSet->StyleSheetAt(nsStyleSet::eDocSheet, i)->List(out, aIndent);
+fputs("\n", out);
+}
+}
+void
+PresShell::VerifyStyleTree()
+{
+VERIFY_STYLE_TREE;
+}
+#endif
+//=============================================================
+//=============================================================
+//-- Debug Reflow Counts
+//=============================================================
+//=============================================================
+#ifdef MOZ_REFLOW_PERF
+//-------------------------------------------------------------
+void
+PresShell::DumpReflows()
+{
+if (mReflowCountMgr) {
+nsAutoCString uriStr;
+if (mDocument) {
+nsIURI *uri = mDocument->GetDocumentURI();
+if (uri) {
+uri->GetPath(uriStr);
+}
+}
+mReflowCountMgr->DisplayTotals(uriStr.get());
+mReflowCountMgr->DisplayHTMLTotals(uriStr.get());
+mReflowCountMgr->DisplayDiffsInTotals("Differences");
+}
+}
+//-------------------------------------------------------------
+void
+PresShell::CountReflows(const char * aName, nsIFrame * aFrame)
+{
+if (mReflowCountMgr) {
+mReflowCountMgr->Add(aName, aFrame);
+}
+}
+//-------------------------------------------------------------
+void
+PresShell::PaintCount(const char * aName,
+nsRenderingContext* aRenderingContext,
+nsPresContext* aPresContext,
+nsIFrame * aFrame,
+const nsPoint& aOffset,
+uint32_t aColor)
+{
+if (mReflowCountMgr) {
+mReflowCountMgr->PaintCount(aName, aRenderingContext, aPresContext,
+aFrame, aOffset, aColor);
+}
+}
+//-------------------------------------------------------------
+void
+PresShell::SetPaintFrameCount(bool aPaintFrameCounts)
+{
+if (mReflowCountMgr) {
+mReflowCountMgr->SetPaintFrameCounts(aPaintFrameCounts);
+}
+}
+bool
+PresShell::IsPaintingFrameCounts()
+{
+if (mReflowCountMgr)
+return mReflowCountMgr->IsPaintingFrameCounts();
+return false;
+}
+//------------------------------------------------------------------
+//-- Reflow Counter Classes Impls
+//------------------------------------------------------------------
+//------------------------------------------------------------------
+ReflowCounter::ReflowCounter(ReflowCountMgr * aMgr) :
+mMgr(aMgr)
+{
+ClearTotals();
+SetTotalsCache();
+}
+//------------------------------------------------------------------
+ReflowCounter::~ReflowCounter()
+{
+}
+//------------------------------------------------------------------
+void ReflowCounter::ClearTotals()
+{
+mTotal = 0;
+}
+//------------------------------------------------------------------
+void ReflowCounter::SetTotalsCache()
+{
+mCacheTotal = mTotal;
+}
+//------------------------------------------------------------------
+void ReflowCounter::CalcDiffInTotals()
+{
+mCacheTotal = mTotal - mCacheTotal;
+}
+//------------------------------------------------------------------
+void ReflowCounter::DisplayTotals(const char * aStr)
+{
+DisplayTotals(mTotal, aStr?aStr:"Totals");
+}
+//------------------------------------------------------------------
+void ReflowCounter::DisplayDiffTotals(const char * aStr)
+{
+DisplayTotals(mCacheTotal, aStr?aStr:"Diff Totals");
+}
+//------------------------------------------------------------------
+void ReflowCounter::DisplayHTMLTotals(const char * aStr)
+{
+DisplayHTMLTotals(mTotal, aStr?aStr:"Totals");
+}
+//------------------------------------------------------------------
+void ReflowCounter::DisplayTotals(uint32_t aTotal, const char * aTitle)
+{
+// figure total
+if (aTotal == 0) {
+return;
+}
+ReflowCounter * gTots = (ReflowCounter *)mMgr->LookUp(kGrandTotalsStr);
+printf("%25s\t", aTitle);
+printf("%d\t", aTotal);
+if (gTots != this && aTotal > 0) {
+gTots->Add(aTotal);
+}
+}
+//------------------------------------------------------------------
+void ReflowCounter::DisplayHTMLTotals(uint32_t aTotal, const char * aTitle)
+{
+if (aTotal == 0) {
+return;
+}
+ReflowCounter * gTots = (ReflowCounter *)mMgr->LookUp(kGrandTotalsStr);
+FILE * fd = mMgr->GetOutFile();
+if (!fd) {
+return;
+}
+fprintf(fd, "<tr><td><center>%s</center></td>", aTitle);
+fprintf(fd, "<td><center>%d</center></td></tr>\n", aTotal);
+if (gTots != this && aTotal > 0) {
+gTots->Add(aTotal);
+}
+}
+//------------------------------------------------------------------
+//-- ReflowCountMgr
+//------------------------------------------------------------------
+#define KEY_BUF_SIZE_FOR_PTR  24 // adequate char[] buffer to sprintf a pointer
+ReflowCountMgr::ReflowCountMgr()
+{
+mCounts = PL_NewHashTable(10, PL_HashString, PL_CompareStrings,
+PL_CompareValues, nullptr, nullptr);
+mIndiFrameCounts = PL_NewHashTable(10, PL_HashString, PL_CompareStrings,
+PL_CompareValues, nullptr, nullptr);
+mCycledOnce              = false;
+mDumpFrameCounts         = false;
+mDumpFrameByFrameCounts  = false;
+mPaintFrameByFrameCounts = false;
+}
+//------------------------------------------------------------------
+ReflowCountMgr::~ReflowCountMgr()
+{
+CleanUp();
+}
+//------------------------------------------------------------------
+ReflowCounter * ReflowCountMgr::LookUp(const char * aName)
+{
+if (nullptr != mCounts) {
+ReflowCounter * counter = (ReflowCounter *)PL_HashTableLookup(mCounts, aName);
+return counter;
+}
+return nullptr;
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::Add(const char * aName, nsIFrame * aFrame)
+{
+NS_ASSERTION(aName != nullptr, "Name shouldn't be null!");
+if (mDumpFrameCounts && nullptr != mCounts) {
+ReflowCounter * counter = (ReflowCounter *)PL_HashTableLookup(mCounts, aName);
+if (counter == nullptr) {
+counter = new ReflowCounter(this);
+char * name = NS_strdup(aName);
+NS_ASSERTION(name != nullptr, "null ptr");
+PL_HashTableAdd(mCounts, name, counter);
+}
+counter->Add();
+}
+if ((mDumpFrameByFrameCounts || mPaintFrameByFrameCounts) &&
+nullptr != mIndiFrameCounts &&
+aFrame != nullptr) {
+char key[KEY_BUF_SIZE_FOR_PTR];
+sprintf(key, "%p", (void*)aFrame);
+IndiReflowCounter * counter = (IndiReflowCounter *)PL_HashTableLookup(mIndiFrameCounts, key);
+if (counter == nullptr) {
+counter = new IndiReflowCounter(this);
+counter->mFrame = aFrame;
+counter->mName.AssignASCII(aName);
+PL_HashTableAdd(mIndiFrameCounts, NS_strdup(key), counter);
+}
+// this eliminates extra counts from super classes
+if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
+counter->mCount++;
+counter->mCounter.Add(1);
+}
+}
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::PaintCount(const char*     aName,
+nsRenderingContext* aRenderingContext,
+nsPresContext*  aPresContext,
+nsIFrame*       aFrame,
+const nsPoint&  aOffset,
+uint32_t        aColor)
+{
+if (mPaintFrameByFrameCounts &&
+nullptr != mIndiFrameCounts &&
+aFrame != nullptr) {
+char key[KEY_BUF_SIZE_FOR_PTR];
+sprintf(key, "%p", (void*)aFrame);
+IndiReflowCounter * counter =
+(IndiReflowCounter *)PL_HashTableLookup(mIndiFrameCounts, key);
+if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
+aRenderingContext->PushState();
+aRenderingContext->Translate(aOffset);
+nsFont font("Times", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
+NS_FONT_WEIGHT_NORMAL, NS_FONT_STRETCH_NORMAL, 0,
+nsPresContext::CSSPixelsToAppUnits(11));
+nsRefPtr<nsFontMetrics> fm;
+aPresContext->DeviceContext()->GetMetricsFor(font,
+// We have one frame, therefore we must have a root...
+aPresContext->GetPresShell()->GetRootFrame()->
+StyleFont()->mLanguage,
+aPresContext->GetUserFontSet(),
+aPresContext->GetTextPerfMetrics(),
+*getter_AddRefs(fm));
+aRenderingContext->SetFont(fm);
+char buf[16];
+sprintf(buf, "%d", counter->mCount);
+nscoord x = 0, y = fm->MaxAscent();
+nscoord width, height = fm->MaxHeight();
+aRenderingContext->SetTextRunRTL(false);
+width = aRenderingContext->GetWidth(buf);
+uint32_t color;
+uint32_t color2;
+if (aColor != 0) {
+color  = aColor;
+color2 = NS_RGB(0,0,0);
+} else {
+uint8_t rc = 0, gc = 0, bc = 0;
+if (counter->mCount < 5) {
+rc = 255;
+gc = 255;
+} else if ( counter->mCount < 11) {
+gc = 255;
+} else {
+rc = 255;
+}
+color  = NS_RGB(rc,gc,bc);
+color2 = NS_RGB(rc/2,gc/2,bc/2);
+}
+nsRect rect(0,0, width+15, height+15);
+aRenderingContext->SetColor(NS_RGB(0,0,0));
+aRenderingContext->FillRect(rect);
+aRenderingContext->SetColor(color2);
+aRenderingContext->DrawString(buf, strlen(buf), x+15,y+15);
+aRenderingContext->SetColor(color);
+aRenderingContext->DrawString(buf, strlen(buf), x,y);
+aRenderingContext->PopState();
+}
+}
+}
+//------------------------------------------------------------------
+int ReflowCountMgr::RemoveItems(PLHashEntry *he, int i, void *arg)
+{
+char *str = (char *)he->key;
+ReflowCounter * counter = (ReflowCounter *)he->value;
+delete counter;
+NS_Free(str);
+return HT_ENUMERATE_REMOVE;
+}
+//------------------------------------------------------------------
+int ReflowCountMgr::RemoveIndiItems(PLHashEntry *he, int i, void *arg)
+{
+char *str = (char *)he->key;
+IndiReflowCounter * counter = (IndiReflowCounter *)he->value;
+delete counter;
+NS_Free(str);
+return HT_ENUMERATE_REMOVE;
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::CleanUp()
+{
+if (nullptr != mCounts) {
+PL_HashTableEnumerateEntries(mCounts, RemoveItems, nullptr);
+PL_HashTableDestroy(mCounts);
+mCounts = nullptr;
+}
+if (nullptr != mIndiFrameCounts) {
+PL_HashTableEnumerateEntries(mIndiFrameCounts, RemoveIndiItems, nullptr);
+PL_HashTableDestroy(mIndiFrameCounts);
+mIndiFrameCounts = nullptr;
+}
+}
+//------------------------------------------------------------------
+int ReflowCountMgr::DoSingleTotal(PLHashEntry *he, int i, void *arg)
+{
+char *str = (char *)he->key;
+ReflowCounter * counter = (ReflowCounter *)he->value;
+counter->DisplayTotals(str);
+return HT_ENUMERATE_NEXT;
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::DoGrandTotals()
+{
+if (nullptr != mCounts) {
+ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
+if (gTots == nullptr) {
+gTots = new ReflowCounter(this);
+PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
+} else {
+gTots->ClearTotals();
+}
+printf("\t\t\t\tTotal\n");
+for (uint32_t i=0;i<78;i++) {
+printf("-");
+}
+printf("\n");
+PL_HashTableEnumerateEntries(mCounts, DoSingleTotal, this);
+}
+}
+static void RecurseIndiTotals(nsPresContext* aPresContext,
+PLHashTable *   aHT,
+nsIFrame *      aParentFrame,
+int32_t         aLevel)
+{
+if (aParentFrame == nullptr) {
+return;
+}
+char key[KEY_BUF_SIZE_FOR_PTR];
+sprintf(key, "%p", (void*)aParentFrame);
+IndiReflowCounter * counter = (IndiReflowCounter *)PL_HashTableLookup(aHT, key);
+if (counter) {
+counter->mHasBeenOutput = true;
+char * name = ToNewCString(counter->mName);
+for (int32_t i=0;i<aLevel;i++) printf(" ");
+printf("%s - %p   [%d][", name, (void*)aParentFrame, counter->mCount);
+printf("%d", counter->mCounter.GetTotal());
+printf("]\n");
+nsMemory::Free(name);
+}
+nsIFrame* child = aParentFrame->GetFirstPrincipalChild();
+while (child) {
+RecurseIndiTotals(aPresContext, aHT, child, aLevel+1);
+child = child->GetNextSibling();
+}
+}
+//------------------------------------------------------------------
+int ReflowCountMgr::DoSingleIndi(PLHashEntry *he, int i, void *arg)
+{
+IndiReflowCounter * counter = (IndiReflowCounter *)he->value;
+if (counter && !counter->mHasBeenOutput) {
+char * name = ToNewCString(counter->mName);
+printf("%s - %p   [%d][", name, (void*)counter->mFrame, counter->mCount);
+printf("%d", counter->mCounter.GetTotal());
+printf("]\n");
+nsMemory::Free(name);
+}
+return HT_ENUMERATE_NEXT;
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::DoIndiTotalsTree()
+{
+if (nullptr != mCounts) {
+printf("\n------------------------------------------------\n");
+printf("-- Individual Frame Counts\n");
+printf("------------------------------------------------\n");
+if (mPresShell) {
+nsIFrame * rootFrame = mPresShell->FrameManager()->GetRootFrame();
+RecurseIndiTotals(mPresContext, mIndiFrameCounts, rootFrame, 0);
+printf("------------------------------------------------\n");
+printf("-- Individual Counts of Frames not in Root Tree\n");
+printf("------------------------------------------------\n");
+PL_HashTableEnumerateEntries(mIndiFrameCounts, DoSingleIndi, this);
+}
+}
+}
+//------------------------------------------------------------------
+int ReflowCountMgr::DoSingleHTMLTotal(PLHashEntry *he, int i, void *arg)
+{
+char *str = (char *)he->key;
+ReflowCounter * counter = (ReflowCounter *)he->value;
+counter->DisplayHTMLTotals(str);
+return HT_ENUMERATE_NEXT;
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::DoGrandHTMLTotals()
+{
+if (nullptr != mCounts) {
+ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
+if (gTots == nullptr) {
+gTots = new ReflowCounter(this);
+PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
+} else {
+gTots->ClearTotals();
+}
+static const char * title[] = {"Class", "Reflows"};
+fprintf(mFD, "<tr>");
+for (uint32_t i=0; i < ArrayLength(title); i++) {
+fprintf(mFD, "<td><center><b>%s<b></center></td>", title[i]);
+}
+fprintf(mFD, "</tr>\n");
+PL_HashTableEnumerateEntries(mCounts, DoSingleHTMLTotal, this);
+}
+}
+//------------------------------------
+void ReflowCountMgr::DisplayTotals(const char * aStr)
+{
+#ifdef DEBUG_rods
+printf("%s\n", aStr?aStr:"No name");
+#endif
+if (mDumpFrameCounts) {
+DoGrandTotals();
+}
+if (mDumpFrameByFrameCounts) {
+DoIndiTotalsTree();
+}
+}
+//------------------------------------
+void ReflowCountMgr::DisplayHTMLTotals(const char * aStr)
+{
+#ifdef WIN32x // XXX NOT XP!
+char name[1024];
+char * sptr = strrchr(aStr, '/');
+if (sptr) {
+sptr++;
+strcpy(name, sptr);
+char * eptr = strrchr(name, '.');
+if (eptr) {
+*eptr = 0;
+}
+strcat(name, "_stats.html");
+}
+mFD = fopen(name, "w");
+if (mFD) {
+fprintf(mFD, "<html><head><title>Reflow Stats</title></head><body>\n");
+const char * title = aStr?aStr:"No name";
+fprintf(mFD, "<center><b>%s</b><br><table border=1 style=\"background-color:#e0e0e0\">", title);
+DoGrandHTMLTotals();
+fprintf(mFD, "</center></table>\n");
+fprintf(mFD, "</body></html>\n");
+fclose(mFD);
+mFD = nullptr;
+}
+#endif // not XP!
+}
+//------------------------------------------------------------------
+int ReflowCountMgr::DoClearTotals(PLHashEntry *he, int i, void *arg)
+{
+ReflowCounter * counter = (ReflowCounter *)he->value;
+counter->ClearTotals();
+return HT_ENUMERATE_NEXT;
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::ClearTotals()
+{
+PL_HashTableEnumerateEntries(mCounts, DoClearTotals, this);
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::ClearGrandTotals()
+{
+if (nullptr != mCounts) {
+ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
+if (gTots == nullptr) {
+gTots = new ReflowCounter(this);
+PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
+} else {
+gTots->ClearTotals();
+gTots->SetTotalsCache();
+}
+}
+}
+//------------------------------------------------------------------
+int ReflowCountMgr::DoDisplayDiffTotals(PLHashEntry *he, int i, void *arg)
+{
+bool cycledOnce = (arg != 0);
+char *str = (char *)he->key;
+ReflowCounter * counter = (ReflowCounter *)he->value;
+if (cycledOnce) {
+counter->CalcDiffInTotals();
+counter->DisplayDiffTotals(str);
+}
+counter->SetTotalsCache();
+return HT_ENUMERATE_NEXT;
+}
+//------------------------------------------------------------------
+void ReflowCountMgr::DisplayDiffsInTotals(const char * aStr)
+{
+if (mCycledOnce) {
+printf("Differences\n");
+for (int32_t i=0;i<78;i++) {
+printf("-");
+}
+printf("\n");
+ClearGrandTotals();
+}
+PL_HashTableEnumerateEntries(mCounts, DoDisplayDiffTotals, (void *)mCycledOnce);
+mCycledOnce = true;
+}
+#endif // MOZ_REFLOW_PERF
+// make a color string like #RRGGBB
+void ColorToString(nscolor aColor, nsAutoString &aString)
+{
+char buf[8];
+PR_snprintf(buf, sizeof(buf), "#%02x%02x%02x",
+NS_GET_R(aColor), NS_GET_G(aColor), NS_GET_B(aColor));
+CopyASCIItoUTF16(buf, aString);
+}
+nsIFrame* nsIPresShell::GetAbsoluteContainingBlock(nsIFrame *aFrame)
+{
+return FrameConstructor()->GetAbsoluteContainingBlock(aFrame,
+nsCSSFrameConstructor::ABS_POS);
+}
+#ifdef ACCESSIBILITY
+bool
+nsIPresShell::IsAccessibilityActive()
+{
+return GetAccService() != nullptr;
+}
+nsAccessibilityService*
+nsIPresShell::AccService()
+{
+return GetAccService();
+}
+#endif
+void nsIPresShell::InitializeStatics()
+{
+NS_ASSERTION(!gCaptureTouchList, "InitializeStatics called multiple times!");
+gCaptureTouchList = new nsRefPtrHashtable<nsUint32HashKey, dom::Touch>;
+gPointerCaptureList = new nsRefPtrHashtable<nsUint32HashKey, nsIContent>;
+gActivePointersIds = new nsClassHashtable<nsUint32HashKey, PointerInfo>;
+}
+void nsIPresShell::ReleaseStatics()
+{
+NS_ASSERTION(gCaptureTouchList, "ReleaseStatics called without Initialize!");
+delete gCaptureTouchList;
+gCaptureTouchList = nullptr;
+delete gPointerCaptureList;
+gPointerCaptureList = nullptr;
+delete gActivePointersIds;
+gActivePointersIds = nullptr;
+}
+// Asks our docshell whether we're active.
+void PresShell::QueryIsActive()
+{
+nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
+if (mDocument) {
+nsIDocument* displayDoc = mDocument->GetDisplayDocument();
+if (displayDoc) {
+// Ok, we're an external resource document -- we need to use our display
+// document's docshell to determine "IsActive" status, since we lack
+// a container.
+NS_ABORT_IF_FALSE(!container,
+"external resource doc shouldn't have "
+"its own container");
+nsIPresShell* displayPresShell = displayDoc->GetShell();
+if (displayPresShell) {
+container = displayPresShell->GetPresContext()->GetContainerWeak();
+}
+}
+}
+nsCOMPtr<nsIDocShell> docshell(do_QueryInterface(container));
+if (docshell) {
+bool isActive;
+nsresult rv = docshell->GetIsActive(&isActive);
+if (NS_SUCCEEDED(rv))
+SetIsActive(isActive);
+}
+}
+// Helper for propagating mIsActive changes to external resources
+static bool
+SetExternalResourceIsActive(nsIDocument* aDocument, void* aClosure)
+{
+nsIPresShell* shell = aDocument->GetShell();
+if (shell) {
+shell->SetIsActive(*static_cast<bool*>(aClosure));
+}
+return true;
+}
+static void
+SetPluginIsActive(nsIContent* aContent, void* aClosure)
+{
+nsIFrame *frame = aContent->GetPrimaryFrame();
+nsIObjectFrame *objectFrame = do_QueryFrame(frame);
+if (objectFrame) {
+objectFrame->SetIsDocumentActive(*static_cast<bool*>(aClosure));
+}
+}
+nsresult
+PresShell::SetIsActive(bool aIsActive)
+{
+NS_PRECONDITION(mDocument, "should only be called with a document");
+mIsActive = aIsActive;
+nsPresContext* presContext = GetPresContext();
+if (presContext &&
+presContext->RefreshDriver()->PresContext() == presContext) {
+presContext->RefreshDriver()->SetThrottled(!mIsActive);
+}
+// Propagate state-change to my resource documents' PresShells
+mDocument->EnumerateExternalResources(SetExternalResourceIsActive,
+&aIsActive);
+mDocument->EnumerateFreezableElements(SetPluginIsActive,
+&aIsActive);
+nsresult rv = UpdateImageLockingState();
+#ifdef ACCESSIBILITY
+if (aIsActive) {
+nsAccessibilityService* accService = AccService();
+if (accService) {
+accService->PresShellActivated(this);
+}
+}
+#endif
+// We have this odd special case here because remote content behaves
+// differently from same-process content when "hidden".  In
+// desktop-type "browser UIs", hidden "tabs" have documents that are
+// part of the chrome tree.  When the tabs are hidden, their content
+// is no longer part of the visible document tree, and the layers
+// for the content are naturally released.
+//
+// Remote content is its own top-level tree in its subprocess.  When
+// it's "hidden", there's no transaction in which the document
+// thinks it's not visible, so layers can be retained forever.  This
+// is problematic when those layers uselessly hold on to precious
+// resources like directly texturable memory.
+//
+// PresShell::SetIsActive() is the first C++ entry point at which we
+// (i) know that our parent process wants our content to be hidden;
+// and (ii) has easy access to the TabChild.  So we use this
+// notification to signal the TabChild to drop its layer tree and
+// stop trying to repaint.
+if (TabChild* tab = TabChild::GetFrom(this)) {
+if (aIsActive) {
+tab->MakeVisible();
+if (!mIsZombie) {
+if (nsIFrame* root = mFrameConstructor->GetRootFrame()) {
+FrameLayerBuilder::InvalidateAllLayersForFrame(
+nsLayoutUtils::GetDisplayRootFrame(root));
+root->SchedulePaint();
+}
+}
+} else {
+tab->MakeHidden();
+}
+}
+return rv;
+}
+/*
+* Determines the current image locking state. Called when one of the
+* dependent factors changes.
+*/
+nsresult
+PresShell::UpdateImageLockingState()
+{
+// We're locked if we're both thawed and active.
+return mDocument->SetImageLockingState(!mFrozen && mIsActive);
+}
+PresShell*
+PresShell::GetRootPresShell()
+{
+if (mPresContext) {
+nsPresContext* rootPresContext = mPresContext->GetRootPresContext();
+if (rootPresContext) {
+return static_cast<PresShell*>(rootPresContext->PresShell());
+}
+}
+return nullptr;
+}
+void
+PresShell::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
+nsArenaMemoryStats *aArenaObjectsSize,
+size_t *aPresShellSize,
+size_t *aStyleSetsSize,
+size_t *aTextRunsSize,
+size_t *aPresContextSize)
+{
+mFrameArena.AddSizeOfExcludingThis(aMallocSizeOf, aArenaObjectsSize);
+*aPresShellSize += aMallocSizeOf(this);
+*aPresShellSize += aArenaObjectsSize->mOther;
+*aStyleSetsSize += StyleSet()->SizeOfIncludingThis(aMallocSizeOf);
+*aTextRunsSize += SizeOfTextRuns(aMallocSizeOf);
+*aPresContextSize += mPresContext->SizeOfIncludingThis(aMallocSizeOf);
+}
+size_t
+PresShell::SizeOfTextRuns(MallocSizeOf aMallocSizeOf) const
+{
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+if (!rootFrame) {
+return 0;
+}
+// clear the TEXT_RUN_MEMORY_ACCOUNTED flags
+nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, nullptr,
+/* clear = */true);
+// collect the total memory in use for textruns
+return nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, aMallocSizeOf,
+/* clear = */false);
+}
+void
+nsIPresShell::MarkFixedFramesForReflow(IntrinsicDirty aIntrinsicDirty)
+{
+nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
+if (rootFrame) {
+const nsFrameList& childList = rootFrame->GetChildList(nsIFrame::kFixedList);
+for (nsFrameList::Enumerator e(childList); !e.AtEnd(); e.Next()) {
+FrameNeedsReflow(e.get(), aIntrinsicDirty, NS_FRAME_IS_DIRTY);
+}
+}
+}
+void
+nsIPresShell::SetScrollPositionClampingScrollPortSize(nscoord aWidth, nscoord aHeight)
+{
+if (!mScrollPositionClampingScrollPortSizeSet ||
+mScrollPositionClampingScrollPortSize.width != aWidth ||
+mScrollPositionClampingScrollPortSize.height != aHeight) {
+mScrollPositionClampingScrollPortSizeSet = true;
+mScrollPositionClampingScrollPortSize.width = aWidth;
+mScrollPositionClampingScrollPortSize.height = aHeight;
+MarkFixedFramesForReflow(eResize);
+}
+}
+void
+nsIPresShell::SetContentDocumentFixedPositionMargins(const nsMargin& aMargins)
+{
+if (mContentDocumentFixedPositionMargins == aMargins) {
+return;
+}
+mContentDocumentFixedPositionMargins = aMargins;
+MarkFixedFramesForReflow(eResize);
+}
+void
+PresShell::SetupFontInflation()
+{
+mFontSizeInflationEmPerLine = nsLayoutUtils::FontSizeInflationEmPerLine();
+mFontSizeInflationMinTwips = nsLayoutUtils::FontSizeInflationMinTwips();
+mFontSizeInflationLineThreshold = nsLayoutUtils::FontSizeInflationLineThreshold();
+mFontSizeInflationForceEnabled = nsLayoutUtils::FontSizeInflationForceEnabled();
+mFontSizeInflationDisabledInMasterProcess = nsLayoutUtils::FontSizeInflationDisabledInMasterProcess();
+NotifyFontSizeInflationEnabledIsDirty();
+}
+void
+nsIPresShell::RecomputeFontSizeInflationEnabled()
+{
+mFontSizeInflationEnabledIsDirty = false;
+MOZ_ASSERT(mPresContext, "our pres context should not be null");
+if ((FontSizeInflationEmPerLine() == 0 &&
+FontSizeInflationMinTwips() == 0) || mPresContext->IsChrome()) {
+mFontSizeInflationEnabled = false;
+return;
+}
+// Force-enabling font inflation always trumps the heuristics here.
+if (!FontSizeInflationForceEnabled()) {
+if (TabChild* tab = TabChild::GetFrom(this)) {
+// We're in a child process.  Cancel inflation if we're not
+// async-pan zoomed.
+if (!tab->IsAsyncPanZoomEnabled()) {
+mFontSizeInflationEnabled = false;
+return;
+}
+} else if (XRE_GetProcessType() == GeckoProcessType_Default) {
+// We're in the master process.  Cancel inflation if it's been
+// explicitly disabled.
+if (FontSizeInflationDisabledInMasterProcess()) {
+mFontSizeInflationEnabled = false;
+return;
+}
+}
+}
+// XXXjwir3:
+// See bug 706918, comment 23 for more information on this particular section
+// of the code. We're using "screen size" in place of the size of the content
+// area, because on mobile, these are close or equal. This will work for our
+// purposes (bug 706198), but it will need to be changed in the future to be
+// more correct when we bring the rest of the viewport code into platform.
+// We actually want the size of the content area, in the event that we don't
+// have any metadata about the width and/or height. On mobile, the screen size
+// and the size of the content area are very close, or the same value.
+// In XUL fennec, the content area is the size of the <browser> widget, but
+// in native fennec, the content area is the size of the Gecko LayerView
+// object.
+// TODO:
+// Once bug 716575 has been resolved, this code should be changed so that it
+// does the right thing on all platforms.
+nsresult rv;
+nsCOMPtr<nsIScreenManager> screenMgr =
+do_GetService("@mozilla.org/gfx/screenmanager;1", &rv);
+if (!NS_SUCCEEDED(rv)) {
+mFontSizeInflationEnabled = false;
+return;
+}
+nsCOMPtr<nsIScreen> screen;
+screenMgr->GetPrimaryScreen(getter_AddRefs(screen));
+if (screen) {
+int32_t screenLeft, screenTop, screenWidth, screenHeight;
+screen->GetRect(&screenLeft, &screenTop, &screenWidth, &screenHeight);
+nsViewportInfo vInf =
+nsContentUtils::GetViewportInfo(GetDocument(), ScreenIntSize(screenWidth, screenHeight));
+if (vInf.GetDefaultZoom() >= CSSToScreenScale(1.0f) || vInf.IsAutoSizeEnabled()) {
+mFontSizeInflationEnabled = false;
+return;
+}
+}
+mFontSizeInflationEnabled = true;
+}
+bool
+nsIPresShell::FontSizeInflationEnabled()
+{
+if (mFontSizeInflationEnabledIsDirty) {
+RecomputeFontSizeInflationEnabled();
+}
+return mFontSizeInflationEnabled;
+}
+void
+nsIPresShell::SetMaxLineBoxWidth(nscoord aMaxLineBoxWidth)
+{
+NS_ASSERTION(aMaxLineBoxWidth >= 0, "attempting to set max line box width to a negative value");
+if (mMaxLineBoxWidth != aMaxLineBoxWidth) {
+mMaxLineBoxWidth = aMaxLineBoxWidth;
+mReflowOnZoomPending = true;
+FrameNeedsReflow(GetRootFrame(), eResize, NS_FRAME_HAS_DIRTY_CHILDREN);
+}
+}
+void
+PresShell::PausePainting()
+{
+if (GetPresContext()->RefreshDriver()->PresContext() != GetPresContext())
+return;
+mPaintingIsFrozen = true;
+GetPresContext()->RefreshDriver()->Freeze();
+}
+void
+PresShell::ResumePainting()
+{
+if (GetPresContext()->RefreshDriver()->PresContext() != GetPresContext())
+return;
+mPaintingIsFrozen = false;
+GetPresContext()->RefreshDriver()->Thaw();
+}

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comparison: layout/base/nsPresShell.cpp

layout/base/nsPresShell.cpp