The Tor Browser: widget/xpwidgets/nsBaseWidget.cpp@44a2da4a2ab2 (annotated)

widget/xpwidgets/nsBaseWidget.cpp@44a2da4a2ab2 (annotated)

widget/xpwidgets/nsBaseWidget.cpp

Fri, 16 Jan 2015 04:50:19 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 04:50:19 +0100
branch: TOR_BUG_9701
changeset 13: 44a2da4a2ab2
permissions: -rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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/. */
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/layers/CompositorChild.h"
 #include "mozilla/layers/CompositorParent.h"
 #include "mozilla/layers/ImageBridgeChild.h"
 #include "nsBaseWidget.h"
 #include "nsDeviceContext.h"
 #include "nsCOMPtr.h"
 #include "nsGfxCIID.h"
 #include "nsWidgetsCID.h"
 #include "nsServiceManagerUtils.h"
 #include "nsIScreenManager.h"
 #include "nsAppDirectoryServiceDefs.h"
 #include "nsISimpleEnumerator.h"
 #include "nsIContent.h"
 #include "nsIDocument.h"
 #include "nsIPresShell.h"
 #include "nsIServiceManager.h"
 #include "mozilla/Preferences.h"
 #include "BasicLayers.h"
 #include "ClientLayerManager.h"
 #include "mozilla/layers/Compositor.h"
 #include "nsIXULRuntime.h"
 #include "nsIXULWindow.h"
 #include "nsIBaseWindow.h"
 #include "nsXULPopupManager.h"
 #include "nsIWidgetListener.h"
 #include "nsIGfxInfo.h"
 #include "npapi.h"
 #include "base/thread.h"
 #include "prdtoa.h"
 #include "prenv.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/unused.h"
 #include "nsContentUtils.h"
 #include "gfxPrefs.h"
 #include "mozilla/gfx/2D.h"
 #include "mozilla/MouseEvents.h"
 #include "GLConsts.h"
 #include "LayerScope.h"
 #include "mozilla/unused.h"
 #ifdef ACCESSIBILITY
 #include "nsAccessibilityService.h"
 #endif
 #ifdef DEBUG
 #include "nsIObserver.h"
 static void debug_RegisterPrefCallbacks();
 #endif
 #ifdef NOISY_WIDGET_LEAKS
 static int32_t gNumWidgets;
 #endif
 #ifdef XP_MACOSX
 #include "nsCocoaFeatures.h"
 #endif
 nsIRollupListener* nsBaseWidget::gRollupListener = nullptr;
 using namespace mozilla::layers;
 using namespace mozilla::ipc;
 using namespace mozilla;
 using base::Thread;
 nsIContent* nsBaseWidget::mLastRollup = nullptr;
 // Global user preference for disabling native theme. Used
 // in NativeWindowTheme.
 bool            gDisableNativeTheme               = false;
 // Async pump timer during injected long touch taps
 #define TOUCH_INJECT_PUMP_TIMER_MSEC 50
 #define TOUCH_INJECT_LONG_TAP_DEFAULT_MSEC 1500
 int32_t nsIWidget::sPointerIdCounter = 0;
 // nsBaseWidget
 NS_IMPL_ISUPPORTS(nsBaseWidget, nsIWidget)
 nsAutoRollup::nsAutoRollup()
 {
   // remember if mLastRollup was null, and only clear it upon destruction
   // if so. This prevents recursive usage of nsAutoRollup from clearing
   // mLastRollup when it shouldn't.
   wasClear = !nsBaseWidget::mLastRollup;
 }
 nsAutoRollup::~nsAutoRollup()
 {
   if (nsBaseWidget::mLastRollup && wasClear) {
     NS_RELEASE(nsBaseWidget::mLastRollup);
   }
 }
 //-------------------------------------------------------------------------
 //
 // nsBaseWidget constructor
 //
 //-------------------------------------------------------------------------
 nsBaseWidget::nsBaseWidget()
 : mWidgetListener(nullptr)
 , mAttachedWidgetListener(nullptr)
 , mContext(nullptr)
 , mCursor(eCursor_standard)
 , mBorderStyle(eBorderStyle_none)
 , mUseLayersAcceleration(false)
 , mForceLayersAcceleration(false)
 , mTemporarilyUseBasicLayerManager(false)
 , mUseAttachedEvents(false)
 , mContextInitialized(false)
 , mBounds(0,0,0,0)
 , mOriginalBounds(nullptr)
 , mClipRectCount(0)
 , mSizeMode(nsSizeMode_Normal)
 , mPopupLevel(ePopupLevelTop)
 , mPopupType(ePopupTypeAny)
 {
 #ifdef NOISY_WIDGET_LEAKS
   gNumWidgets++;
   printf("WIDGETS+ = %d\n", gNumWidgets);
 #endif
 #ifdef DEBUG
   debug_RegisterPrefCallbacks();
 #endif
   mShutdownObserver = new WidgetShutdownObserver(this);
   nsContentUtils::RegisterShutdownObserver(mShutdownObserver);
 }
 NS_IMPL_ISUPPORTS(WidgetShutdownObserver, nsIObserver)
 NS_IMETHODIMP
 WidgetShutdownObserver::Observe(nsISupports *aSubject,
                                 const char *aTopic,
                                 const char16_t *aData)
 {
   if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0 &&
       mWidget) {
     mWidget->Shutdown();
     nsContentUtils::UnregisterShutdownObserver(this);
   }
  return NS_OK;
 }
 void
 nsBaseWidget::Shutdown()
 {
   DestroyCompositor();
   mShutdownObserver = nullptr;
 }
 static void DeferredDestroyCompositor(CompositorParent* aCompositorParent,
                               CompositorChild* aCompositorChild)
 {
     // Bug 848949 needs to be fixed before
     // we can close the channel properly
     //aCompositorChild->Close();
     aCompositorParent->Release();
     aCompositorChild->Release();
 }
 void nsBaseWidget::DestroyCompositor()
 {
   LayerScope::DestroyServerSocket();
   if (mCompositorChild) {
     mCompositorChild->SendWillStop();
     mCompositorChild->Destroy();
     // The call just made to SendWillStop can result in IPC from the
     // CompositorParent to the CompositorChild (e.g. caused by the destruction
     // of shared memory). We need to ensure this gets processed by the
     // CompositorChild before it gets destroyed. It suffices to ensure that
     // events already in the MessageLoop get processed before the
     // CompositorChild is destroyed, so we add a task to the MessageLoop to
     // handle compositor desctruction.
     MessageLoop::current()->PostTask(FROM_HERE,
                NewRunnableFunction(DeferredDestroyCompositor, mCompositorParent,
                                    mCompositorChild));
     // The DestroyCompositor task we just added to the MessageLoop will handle
     // releasing mCompositorParent and mCompositorChild.
     unused << mCompositorParent.forget();
     unused << mCompositorChild.forget();
   }
 }
 //-------------------------------------------------------------------------
 //
 // nsBaseWidget destructor
 //
 //-------------------------------------------------------------------------
 nsBaseWidget::~nsBaseWidget()
 {
   if (mLayerManager &&
       mLayerManager->GetBackendType() == LayersBackend::LAYERS_BASIC) {
     static_cast<BasicLayerManager*>(mLayerManager.get())->ClearRetainerWidget();
   }
   if (mLayerManager) {
     mLayerManager->Destroy();
     mLayerManager = nullptr;
   }
   if (mShutdownObserver) {
     // If the shutdown observer is currently processing observers,
     // then UnregisterShutdownObserver won't stop our Observer
     // function from being called. Make sure we don't try
     // to reference the dead widget.
     mShutdownObserver->mWidget = nullptr;
     nsContentUtils::UnregisterShutdownObserver(mShutdownObserver);
   }
   DestroyCompositor();
 #ifdef NOISY_WIDGET_LEAKS
   gNumWidgets--;
   printf("WIDGETS- = %d\n", gNumWidgets);
 #endif
   NS_IF_RELEASE(mContext);
   delete mOriginalBounds;
 }
 //-------------------------------------------------------------------------
 //
 // Basic create.
 //
 //-------------------------------------------------------------------------
 void nsBaseWidget::BaseCreate(nsIWidget *aParent,
                               const nsIntRect &aRect,
                               nsDeviceContext *aContext,
                               nsWidgetInitData *aInitData)
 {
   static bool gDisableNativeThemeCached = false;
   if (!gDisableNativeThemeCached) {
     Preferences::AddBoolVarCache(&gDisableNativeTheme,
                                  "mozilla.widget.disable-native-theme",
                                  gDisableNativeTheme);
     gDisableNativeThemeCached = true;
   }
   // keep a reference to the device context
   if (aContext) {
     mContext = aContext;
     NS_ADDREF(mContext);
   }
   else {
     mContext = new nsDeviceContext();
     NS_ADDREF(mContext);
     mContext->Init(nullptr);
   }
   if (nullptr != aInitData) {
     mWindowType = aInitData->mWindowType;
     mBorderStyle = aInitData->mBorderStyle;
     mPopupLevel = aInitData->mPopupLevel;
     mPopupType = aInitData->mPopupHint;
     mRequireOffMainThreadCompositing = aInitData->mRequireOffMainThreadCompositing;
   }
   if (aParent) {
     aParent->AddChild(this);
   }
 }
 NS_IMETHODIMP nsBaseWidget::CaptureMouse(bool aCapture)
 {
   return NS_OK;
 }
 //-------------------------------------------------------------------------
 //
 // Accessor functions to get/set the client data
 //
 //-------------------------------------------------------------------------
 nsIWidgetListener* nsBaseWidget::GetWidgetListener()
 {
   return mWidgetListener;
 }
 void nsBaseWidget::SetWidgetListener(nsIWidgetListener* aWidgetListener)
 {
   mWidgetListener = aWidgetListener;
 }
 already_AddRefed<nsIWidget>
 nsBaseWidget::CreateChild(const nsIntRect  &aRect,
                           nsDeviceContext *aContext,
                           nsWidgetInitData *aInitData,
                           bool             aForceUseIWidgetParent)
 {
   nsIWidget* parent = this;
   nsNativeWidget nativeParent = nullptr;
   if (!aForceUseIWidgetParent) {
     // Use only either parent or nativeParent, not both, to match
     // existing code.  Eventually Create() should be divested of its
     // nativeWidget parameter.
     nativeParent = parent ? parent->GetNativeData(NS_NATIVE_WIDGET) : nullptr;
     parent = nativeParent ? nullptr : parent;
     NS_ABORT_IF_FALSE(!parent || !nativeParent, "messed up logic");
   }
   nsCOMPtr<nsIWidget> widget;
   if (aInitData && aInitData->mWindowType == eWindowType_popup) {
     widget = AllocateChildPopupWidget();
   } else {
     static NS_DEFINE_IID(kCChildCID, NS_CHILD_CID);
     widget = do_CreateInstance(kCChildCID);
   }
   if (widget &&
       NS_SUCCEEDED(widget->Create(parent, nativeParent, aRect,
                                   aContext, aInitData))) {
     return widget.forget();
   }
   return nullptr;
 }
 // Attach a view to our widget which we'll send events to.
 NS_IMETHODIMP
 nsBaseWidget::AttachViewToTopLevel(bool aUseAttachedEvents,
                                    nsDeviceContext *aContext)
 {
   NS_ASSERTION((mWindowType == eWindowType_toplevel ||
                 mWindowType == eWindowType_dialog ||
                 mWindowType == eWindowType_invisible ||
                 mWindowType == eWindowType_child),
                "Can't attach to window of that type");
   mUseAttachedEvents = aUseAttachedEvents;
   if (aContext) {
     if (mContext) {
       NS_IF_RELEASE(mContext);
     }
     mContext = aContext;
     NS_ADDREF(mContext);
   }
   return NS_OK;
 }
 nsIWidgetListener* nsBaseWidget::GetAttachedWidgetListener()
  {
    return mAttachedWidgetListener;
  }
 void nsBaseWidget::SetAttachedWidgetListener(nsIWidgetListener* aListener)
  {
    mAttachedWidgetListener = aListener;
  }
 //-------------------------------------------------------------------------
 //
 // Close this nsBaseWidget
 //
 //-------------------------------------------------------------------------
 NS_METHOD nsBaseWidget::Destroy()
 {
   // Just in case our parent is the only ref to us
   nsCOMPtr<nsIWidget> kungFuDeathGrip(this);
   // disconnect from the parent
   nsIWidget *parent = GetParent();
   if (parent) {
     parent->RemoveChild(this);
   }
   return NS_OK;
 }
 //-------------------------------------------------------------------------
 //
 // Set this nsBaseWidget's parent
 //
 //-------------------------------------------------------------------------
 NS_IMETHODIMP nsBaseWidget::SetParent(nsIWidget* aNewParent)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 //-------------------------------------------------------------------------
 //
 // Get this nsBaseWidget parent
 //
 //-------------------------------------------------------------------------
 nsIWidget* nsBaseWidget::GetParent(void)
 {
   return nullptr;
 }
 //-------------------------------------------------------------------------
 //
 // Get this nsBaseWidget top level widget
 //
 //-------------------------------------------------------------------------
 nsIWidget* nsBaseWidget::GetTopLevelWidget()
 {
   nsIWidget *topLevelWidget = nullptr, *widget = this;
   while (widget) {
     topLevelWidget = widget;
     widget = widget->GetParent();
   }
   return topLevelWidget;
 }
 //-------------------------------------------------------------------------
 //
 // Get this nsBaseWidget's top (non-sheet) parent (if it's a sheet)
 //
 //-------------------------------------------------------------------------
 nsIWidget* nsBaseWidget::GetSheetWindowParent(void)
 {
   return nullptr;
 }
 float nsBaseWidget::GetDPI()
 {
   return 96.0f;
 }
 CSSToLayoutDeviceScale nsIWidget::GetDefaultScale()
 {
   double devPixelsPerCSSPixel = DefaultScaleOverride();
   if (devPixelsPerCSSPixel <= 0.0) {
     devPixelsPerCSSPixel = GetDefaultScaleInternal();
   }
   return CSSToLayoutDeviceScale(devPixelsPerCSSPixel);
 }
 /* static */
 double nsIWidget::DefaultScaleOverride()
 {
   // The number of device pixels per CSS pixel. A value <= 0 means choose
   // automatically based on the DPI. A positive value is used as-is. This effectively
   // controls the size of a CSS "px".
   double devPixelsPerCSSPixel = -1.0;
   nsAdoptingCString prefString = Preferences::GetCString("layout.css.devPixelsPerPx");
   if (!prefString.IsEmpty()) {
     devPixelsPerCSSPixel = PR_strtod(prefString, nullptr);
   }
   return devPixelsPerCSSPixel;
 }
 //-------------------------------------------------------------------------
 //
 // Add a child to the list of children
 //
 //-------------------------------------------------------------------------
 void nsBaseWidget::AddChild(nsIWidget* aChild)
 {
   NS_PRECONDITION(!aChild->GetNextSibling() && !aChild->GetPrevSibling(),
                   "aChild not properly removed from its old child list");
   if (!mFirstChild) {
     mFirstChild = mLastChild = aChild;
   } else {
     // append to the list
     NS_ASSERTION(mLastChild, "Bogus state");
     NS_ASSERTION(!mLastChild->GetNextSibling(), "Bogus state");
     mLastChild->SetNextSibling(aChild);
     aChild->SetPrevSibling(mLastChild);
     mLastChild = aChild;
   }
 }
 //-------------------------------------------------------------------------
 //
 // Remove a child from the list of children
 //
 //-------------------------------------------------------------------------
 void nsBaseWidget::RemoveChild(nsIWidget* aChild)
 {
 #ifdef DEBUG
 #ifdef XP_MACOSX
   // nsCocoaWindow doesn't implement GetParent, so in that case parent will be
   // null and we'll just have to do without this assertion.
   nsIWidget* parent = aChild->GetParent();
   NS_ASSERTION(!parent || parent == this, "Not one of our kids!");
 #else
   NS_ASSERTION(aChild->GetParent() == this, "Not one of our kids!");
 #endif
 #endif
   if (mLastChild == aChild) {
     mLastChild = mLastChild->GetPrevSibling();
   }
   if (mFirstChild == aChild) {
     mFirstChild = mFirstChild->GetNextSibling();
   }
   // Now remove from the list.  Make sure that we pass ownership of the tail
   // of the list correctly before we have aChild let go of it.
   nsIWidget* prev = aChild->GetPrevSibling();
   nsIWidget* next = aChild->GetNextSibling();
   if (prev) {
     prev->SetNextSibling(next);
   }
   if (next) {
     next->SetPrevSibling(prev);
   }
   aChild->SetNextSibling(nullptr);
   aChild->SetPrevSibling(nullptr);
 }
 //-------------------------------------------------------------------------
 //
 // Sets widget's position within its parent's child list.
 //
 //-------------------------------------------------------------------------
 void nsBaseWidget::SetZIndex(int32_t aZIndex)
 {
   // Hold a ref to ourselves just in case, since we're going to remove
   // from our parent.
   nsCOMPtr<nsIWidget> kungFuDeathGrip(this);
   mZIndex = aZIndex;
   // reorder this child in its parent's list.
   nsBaseWidget* parent = static_cast<nsBaseWidget*>(GetParent());
   if (parent) {
     parent->RemoveChild(this);
     // Scope sib outside the for loop so we can check it afterward
     nsIWidget* sib = parent->GetFirstChild();
     for ( ; sib; sib = sib->GetNextSibling()) {
       int32_t childZIndex = GetZIndex();
       if (aZIndex < childZIndex) {
         // Insert ourselves before sib
         nsIWidget* prev = sib->GetPrevSibling();
         mNextSibling = sib;
         mPrevSibling = prev;
         sib->SetPrevSibling(this);
         if (prev) {
           prev->SetNextSibling(this);
         } else {
           NS_ASSERTION(sib == parent->mFirstChild, "Broken child list");
           // We've taken ownership of sib, so it's safe to have parent let
           // go of it
           parent->mFirstChild = this;
         }
         PlaceBehind(eZPlacementBelow, sib, false);
         break;
       }
     }
     // were we added to the list?
     if (!sib) {
       parent->AddChild(this);
     }
   }
 }
 //-------------------------------------------------------------------------
 //
 // Places widget behind the given widget (platforms must override)
 //
 //-------------------------------------------------------------------------
 NS_IMETHODIMP nsBaseWidget::PlaceBehind(nsTopLevelWidgetZPlacement aPlacement,
                                         nsIWidget *aWidget, bool aActivate)
 {
   return NS_OK;
 }
 //-------------------------------------------------------------------------
 //
 // Maximize, minimize or restore the window. The BaseWidget implementation
 // merely stores the state.
 //
 //-------------------------------------------------------------------------
 NS_IMETHODIMP nsBaseWidget::SetSizeMode(int32_t aMode)
 {
   if (aMode == nsSizeMode_Normal ||
       aMode == nsSizeMode_Minimized ||
       aMode == nsSizeMode_Maximized ||
       aMode == nsSizeMode_Fullscreen) {
     mSizeMode = (nsSizeMode) aMode;
     return NS_OK;
   }
   return NS_ERROR_ILLEGAL_VALUE;
 }
 //-------------------------------------------------------------------------
 //
 // Get this component cursor
 //
 //-------------------------------------------------------------------------
 nsCursor nsBaseWidget::GetCursor()
 {
   return mCursor;
 }
 NS_METHOD nsBaseWidget::SetCursor(nsCursor aCursor)
 {
   mCursor = aCursor;
   return NS_OK;
 }
 NS_IMETHODIMP nsBaseWidget::SetCursor(imgIContainer* aCursor,
                                       uint32_t aHotspotX, uint32_t aHotspotY)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 //-------------------------------------------------------------------------
 //
 // Window transparency methods
 //
 //-------------------------------------------------------------------------
 void nsBaseWidget::SetTransparencyMode(nsTransparencyMode aMode) {
 }
 nsTransparencyMode nsBaseWidget::GetTransparencyMode() {
   return eTransparencyOpaque;
 }
 bool
 nsBaseWidget::StoreWindowClipRegion(const nsTArray<nsIntRect>& aRects)
 {
   if (mClipRects && mClipRectCount == aRects.Length() &&
       memcmp(mClipRects, aRects.Elements(), sizeof(nsIntRect)*mClipRectCount) == 0)
     return false;
   mClipRectCount = aRects.Length();
   mClipRects = new nsIntRect[mClipRectCount];
   if (mClipRects) {
     memcpy(mClipRects, aRects.Elements(), sizeof(nsIntRect)*mClipRectCount);
   }
   return true;
 }
 void
 nsBaseWidget::GetWindowClipRegion(nsTArray<nsIntRect>* aRects)
 {
   if (mClipRects) {
     aRects->AppendElements(mClipRects.get(), mClipRectCount);
   } else {
     aRects->AppendElement(nsIntRect(0, 0, mBounds.width, mBounds.height));
   }
 }
 //-------------------------------------------------------------------------
 //
 // Set window shadow style
 //
 //-------------------------------------------------------------------------
 NS_IMETHODIMP nsBaseWidget::SetWindowShadowStyle(int32_t aMode)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 //-------------------------------------------------------------------------
 //
 // Hide window borders/decorations for this widget
 //
 //-------------------------------------------------------------------------
 NS_IMETHODIMP nsBaseWidget::HideWindowChrome(bool aShouldHide)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 //-------------------------------------------------------------------------
 //
 // Put the window into full-screen mode
 //
 //-------------------------------------------------------------------------
 NS_IMETHODIMP nsBaseWidget::MakeFullScreen(bool aFullScreen)
 {
   HideWindowChrome(aFullScreen);
   if (aFullScreen) {
     if (!mOriginalBounds)
       mOriginalBounds = new nsIntRect();
     GetScreenBounds(*mOriginalBounds);
     // convert dev pix to display pix for window manipulation
     CSSToLayoutDeviceScale scale = GetDefaultScale();
     mOriginalBounds->x = NSToIntRound(mOriginalBounds->x / scale.scale);
     mOriginalBounds->y = NSToIntRound(mOriginalBounds->y / scale.scale);
     mOriginalBounds->width = NSToIntRound(mOriginalBounds->width / scale.scale);
     mOriginalBounds->height = NSToIntRound(mOriginalBounds->height / scale.scale);
     // Move to top-left corner of screen and size to the screen dimensions
     nsCOMPtr<nsIScreenManager> screenManager;
     screenManager = do_GetService("@mozilla.org/gfx/screenmanager;1");
     NS_ASSERTION(screenManager, "Unable to grab screenManager.");
     if (screenManager) {
       nsCOMPtr<nsIScreen> screen;
       screenManager->ScreenForRect(mOriginalBounds->x,
                                    mOriginalBounds->y,
                                    mOriginalBounds->width,
                                    mOriginalBounds->height,
                                    getter_AddRefs(screen));
       if (screen) {
         int32_t left, top, width, height;
         if (NS_SUCCEEDED(screen->GetRectDisplayPix(&left, &top, &width, &height))) {
           Resize(left, top, width, height, true);
         }
       }
     }
   } else if (mOriginalBounds) {
     Resize(mOriginalBounds->x, mOriginalBounds->y, mOriginalBounds->width,
            mOriginalBounds->height, true);
   }
   return NS_OK;
 }
 nsBaseWidget::AutoLayerManagerSetup::AutoLayerManagerSetup(
     nsBaseWidget* aWidget, gfxContext* aTarget,
     BufferMode aDoubleBuffering, ScreenRotation aRotation)
   : mWidget(aWidget)
 {
   mLayerManager = static_cast<BasicLayerManager*>(mWidget->GetLayerManager());
   if (mLayerManager) {
     NS_ASSERTION(mLayerManager->GetBackendType() == LayersBackend::LAYERS_BASIC,
       "AutoLayerManagerSetup instantiated for non-basic layer backend!");
     mLayerManager->SetDefaultTarget(aTarget);
     mLayerManager->SetDefaultTargetConfiguration(aDoubleBuffering, aRotation);
   }
 }
 nsBaseWidget::AutoLayerManagerSetup::~AutoLayerManagerSetup()
 {
   if (mLayerManager) {
     NS_ASSERTION(mLayerManager->GetBackendType() == LayersBackend::LAYERS_BASIC,
       "AutoLayerManagerSetup instantiated for non-basic layer backend!");
     mLayerManager->SetDefaultTarget(nullptr);
     mLayerManager->SetDefaultTargetConfiguration(mozilla::layers::BufferMode::BUFFER_NONE, ROTATION_0);
   }
 }
 nsBaseWidget::AutoUseBasicLayerManager::AutoUseBasicLayerManager(nsBaseWidget* aWidget)
   : mWidget(aWidget)
 {
   mPreviousTemporarilyUseBasicLayerManager =
     mWidget->mTemporarilyUseBasicLayerManager;
   mWidget->mTemporarilyUseBasicLayerManager = true;
 }
 nsBaseWidget::AutoUseBasicLayerManager::~AutoUseBasicLayerManager()
 {
   mWidget->mTemporarilyUseBasicLayerManager =
     mPreviousTemporarilyUseBasicLayerManager;
 }
 bool
 nsBaseWidget::ComputeShouldAccelerate(bool aDefault)
 {
 #if defined(XP_WIN) || defined(ANDROID) || \
     defined(MOZ_GL_PROVIDER) || defined(XP_MACOSX) || defined(MOZ_WIDGET_QT)
   bool accelerateByDefault = true;
 #else
   bool accelerateByDefault = false;
 #endif
 #ifdef XP_MACOSX
   // 10.6.2 and lower have a bug involving textures and pixel buffer objects
   // that caused bug 629016, so we don't allow OpenGL-accelerated layers on
   // those versions of the OS.
   // This will still let full-screen video be accelerated on OpenGL, because
   // that XUL widget opts in to acceleration, but that's probably OK.
   SInt32 major = nsCocoaFeatures::OSXVersionMajor();
   SInt32 minor = nsCocoaFeatures::OSXVersionMinor();
   SInt32 bugfix = nsCocoaFeatures::OSXVersionBugFix();
   if (major == 10 && minor == 6 && bugfix <= 2) {
     accelerateByDefault = false;
   }
 #endif
   // we should use AddBoolPrefVarCache
   bool disableAcceleration = gfxPrefs::LayersAccelerationDisabled();
   mForceLayersAcceleration = gfxPrefs::LayersAccelerationForceEnabled();
   const char *acceleratedEnv = PR_GetEnv("MOZ_ACCELERATED");
   accelerateByDefault = accelerateByDefault ||
                         (acceleratedEnv && (*acceleratedEnv != '0'));
   nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
   bool safeMode = false;
   if (xr)
     xr->GetInSafeMode(&safeMode);
   bool whitelisted = false;
   nsCOMPtr<nsIGfxInfo> gfxInfo = do_GetService("@mozilla.org/gfx/info;1");
   if (gfxInfo) {
     // bug 655578: on X11 at least, we must always call GetData (even if we don't need that information)
     // as that's what causes GfxInfo initialization which kills the zombie 'glxtest' process.
     // initially we relied on the fact that GetFeatureStatus calls GetData for us, but bug 681026 showed
     // that assumption to be unsafe.
     gfxInfo->GetData();
     int32_t status;
     if (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_OPENGL_LAYERS, &status))) {
       if (status == nsIGfxInfo::FEATURE_NO_INFO) {
         whitelisted = true;
       }
     }
   }
   if (disableAcceleration || safeMode)
     return false;
   if (mForceLayersAcceleration)
     return true;
   if (!whitelisted) {
     static int tell_me_once = 0;
     if (!tell_me_once) {
       NS_WARNING("OpenGL-accelerated layers are not supported on this system");
       tell_me_once = 1;
     }
 #ifdef MOZ_ANDROID_OMTC
     NS_RUNTIMEABORT("OpenGL-accelerated layers are a hard requirement on this platform. "
                     "Cannot continue without support for them");
 #endif
     return false;
   }
   if (accelerateByDefault)
     return true;
   /* use the window acceleration flag */
   return aDefault;
 }
 CompositorParent* nsBaseWidget::NewCompositorParent(int aSurfaceWidth,
                                                     int aSurfaceHeight)
 {
   return new CompositorParent(this, false, aSurfaceWidth, aSurfaceHeight);
 }
 void nsBaseWidget::CreateCompositor()
 {
   nsIntRect rect;
   GetBounds(rect);
   CreateCompositor(rect.width, rect.height);
 }
 void
 nsBaseWidget::GetPreferredCompositorBackends(nsTArray<LayersBackend>& aHints)
 {
   if (mUseLayersAcceleration) {
     aHints.AppendElement(LayersBackend::LAYERS_OPENGL);
   }
   aHints.AppendElement(LayersBackend::LAYERS_BASIC);
 }
 static void
 CheckForBasicBackends(nsTArray<LayersBackend>& aHints)
 {
   for (size_t i = 0; i < aHints.Length(); ++i) {
     if (aHints[i] == LayersBackend::LAYERS_BASIC &&
         !Preferences::GetBool("layers.offmainthreadcomposition.force-basic", false)) {
       // basic compositor is not stable enough for regular use
       aHints[i] = LayersBackend::LAYERS_NONE;
     }
   }
 }
 void nsBaseWidget::CreateCompositor(int aWidth, int aHeight)
 {
   // Recreating this is tricky, as we may still have an old and we need
   // to make sure it's properly destroyed by calling DestroyCompositor!
   // If we've already received a shutdown notification, don't try
   // create a new compositor.
   if (!mShutdownObserver) {
     return;
   }
   // The server socket has to be created on the main thread.
   LayerScope::CreateServerSocket();
   mCompositorParent = NewCompositorParent(aWidth, aHeight);
   MessageChannel *parentChannel = mCompositorParent->GetIPCChannel();
   ClientLayerManager* lm = new ClientLayerManager(this);
   MessageLoop *childMessageLoop = CompositorParent::CompositorLoop();
   mCompositorChild = new CompositorChild(lm);
   mCompositorChild->Open(parentChannel, childMessageLoop, ipc::ChildSide);
   TextureFactoryIdentifier textureFactoryIdentifier;
   PLayerTransactionChild* shadowManager = nullptr;
   nsTArray<LayersBackend> backendHints;
   GetPreferredCompositorBackends(backendHints);
   if (!mRequireOffMainThreadCompositing) {
     CheckForBasicBackends(backendHints);
   }
   bool success = false;
   if (!backendHints.IsEmpty()) {
     shadowManager = mCompositorChild->SendPLayerTransactionConstructor(
       backendHints, 0, &textureFactoryIdentifier, &success);
   }
   if (success) {
     ShadowLayerForwarder* lf = lm->AsShadowForwarder();
     if (!lf) {
       delete lm;
       mCompositorChild = nullptr;
       return;
     }
     lf->SetShadowManager(shadowManager);
     lf->IdentifyTextureHost(textureFactoryIdentifier);
     ImageBridgeChild::IdentifyCompositorTextureHost(textureFactoryIdentifier);
     WindowUsesOMTC();
     mLayerManager = lm;
     return;
   }
   NS_WARNING("Failed to create an OMT compositor.");
   DestroyCompositor();
   // Compositor child had the only reference to LayerManager and will have
   // deallocated it when being freed.
 }
 bool nsBaseWidget::ShouldUseOffMainThreadCompositing()
 {
   return CompositorParent::CompositorLoop();
 }
 LayerManager* nsBaseWidget::GetLayerManager(PLayerTransactionChild* aShadowManager,
                                             LayersBackend aBackendHint,
                                             LayerManagerPersistence aPersistence,
                                             bool* aAllowRetaining)
 {
   if (!mLayerManager) {
     mUseLayersAcceleration = ComputeShouldAccelerate(mUseLayersAcceleration);
     // Try to use an async compositor first, if possible
     if (ShouldUseOffMainThreadCompositing()) {
       // e10s uses the parameter to pass in the shadow manager from the TabChild
       // so we don't expect to see it there since this doesn't support e10s.
       NS_ASSERTION(aShadowManager == nullptr, "Async Compositor not supported with e10s");
       CreateCompositor();
     }
     if (!mLayerManager) {
       mLayerManager = CreateBasicLayerManager();
     }
   }
   if (mTemporarilyUseBasicLayerManager && !mBasicLayerManager) {
     mBasicLayerManager = CreateBasicLayerManager();
   }
   LayerManager* usedLayerManager = mTemporarilyUseBasicLayerManager ?
                                      mBasicLayerManager : mLayerManager;
   if (aAllowRetaining) {
     *aAllowRetaining = (usedLayerManager == mLayerManager);
   }
   return usedLayerManager;
 }
 LayerManager* nsBaseWidget::CreateBasicLayerManager()
 {
   return new BasicLayerManager(this);
 }
 CompositorChild* nsBaseWidget::GetRemoteRenderer()
 {
   return mCompositorChild;
 }
 TemporaryRef<mozilla::gfx::DrawTarget> nsBaseWidget::StartRemoteDrawing()
 {
   return nullptr;
 }
 //-------------------------------------------------------------------------
 //
 // Return the used device context
 //
 //-------------------------------------------------------------------------
 nsDeviceContext* nsBaseWidget::GetDeviceContext()
 {
   if (!mContextInitialized) {
     mContext->Init(this);
     mContextInitialized = true;
   }
   return mContext;
 }
 //-------------------------------------------------------------------------
 //
 // Get the thebes surface
 //
 //-------------------------------------------------------------------------
 gfxASurface *nsBaseWidget::GetThebesSurface()
 {
   // in theory we should get our parent's surface,
   // clone it, and set a device offset before returning
   return nullptr;
 }
 //-------------------------------------------------------------------------
 //
 // Destroy the window
 //
 //-------------------------------------------------------------------------
 void nsBaseWidget::OnDestroy()
 {
   // release references to device context and app shell
   NS_IF_RELEASE(mContext);
 }
 NS_METHOD nsBaseWidget::SetWindowClass(const nsAString& xulWinType)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_METHOD nsBaseWidget::MoveClient(double aX, double aY)
 {
   nsIntPoint clientOffset(GetClientOffset());
   // GetClientOffset returns device pixels; scale back to display pixels
   // if that's what this widget uses for the Move/Resize APIs
   CSSToLayoutDeviceScale scale = BoundsUseDisplayPixels()
                                     ? GetDefaultScale()
                                     : CSSToLayoutDeviceScale(1.0);
   aX -= clientOffset.x * 1.0 / scale.scale;
   aY -= clientOffset.y * 1.0 / scale.scale;
   return Move(aX, aY);
 }
 NS_METHOD nsBaseWidget::ResizeClient(double aWidth,
                                      double aHeight,
                                      bool aRepaint)
 {
   NS_ASSERTION((aWidth >=0) , "Negative width passed to ResizeClient");
   NS_ASSERTION((aHeight >=0), "Negative height passed to ResizeClient");
   nsIntRect clientBounds;
   GetClientBounds(clientBounds);
   // GetClientBounds and mBounds are device pixels; scale back to display pixels
   // if that's what this widget uses for the Move/Resize APIs
   CSSToLayoutDeviceScale scale = BoundsUseDisplayPixels()
                                     ? GetDefaultScale()
                                     : CSSToLayoutDeviceScale(1.0);
   double invScale = 1.0 / scale.scale;
   aWidth = mBounds.width * invScale + (aWidth - clientBounds.width * invScale);
   aHeight = mBounds.height * invScale + (aHeight - clientBounds.height * invScale);
   return Resize(aWidth, aHeight, aRepaint);
 }
 NS_METHOD nsBaseWidget::ResizeClient(double aX,
                                      double aY,
                                      double aWidth,
                                      double aHeight,
                                      bool aRepaint)
 {
   NS_ASSERTION((aWidth >=0) , "Negative width passed to ResizeClient");
   NS_ASSERTION((aHeight >=0), "Negative height passed to ResizeClient");
   nsIntRect clientBounds;
   GetClientBounds(clientBounds);
   double scale = BoundsUseDisplayPixels() ? 1.0 / GetDefaultScale().scale : 1.0;
   aWidth = mBounds.width * scale + (aWidth - clientBounds.width * scale);
   aHeight = mBounds.height * scale + (aHeight - clientBounds.height * scale);
   nsIntPoint clientOffset(GetClientOffset());
   aX -= clientOffset.x * scale;
   aY -= clientOffset.y * scale;
   return Resize(aX, aY, aWidth, aHeight, aRepaint);
 }
 //-------------------------------------------------------------------------
 //
 // Bounds
 //
 //-------------------------------------------------------------------------
 /**
 * If the implementation of nsWindow supports borders this method MUST be overridden
 *
 **/
 NS_METHOD nsBaseWidget::GetClientBounds(nsIntRect &aRect)
 {
   return GetBounds(aRect);
 }
 /**
 * If the implementation of nsWindow supports borders this method MUST be overridden
 *
 **/
 NS_METHOD nsBaseWidget::GetBounds(nsIntRect &aRect)
 {
   aRect = mBounds;
   return NS_OK;
 }
 /**
 * If the implementation of nsWindow uses a local coordinate system within the window,
 * this method must be overridden
 *
 **/
 NS_METHOD nsBaseWidget::GetScreenBounds(nsIntRect &aRect)
 {
   return GetBounds(aRect);
 }
 nsIntPoint nsBaseWidget::GetClientOffset()
 {
   return nsIntPoint(0, 0);
 }
 NS_IMETHODIMP
 nsBaseWidget::GetNonClientMargins(nsIntMargin &margins)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 nsBaseWidget::SetNonClientMargins(nsIntMargin &margins)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_METHOD nsBaseWidget::EnableDragDrop(bool aEnable)
 {
   return NS_OK;
 }
 uint32_t nsBaseWidget::GetMaxTouchPoints() const
 {
   return 0;
 }
 NS_METHOD nsBaseWidget::SetModal(bool aModal)
 {
   return NS_ERROR_FAILURE;
 }
 NS_IMETHODIMP
 nsBaseWidget::GetAttention(int32_t aCycleCount) {
     return NS_OK;
 }
 bool
 nsBaseWidget::HasPendingInputEvent()
 {
   return false;
 }
 NS_IMETHODIMP
 nsBaseWidget::SetIcon(const nsAString&)
 {
   return NS_OK;
 }
 NS_IMETHODIMP
 nsBaseWidget::SetWindowTitlebarColor(nscolor aColor, bool aActive)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 bool
 nsBaseWidget::ShowsResizeIndicator(nsIntRect* aResizerRect)
 {
   return false;
 }
 NS_IMETHODIMP
 nsBaseWidget::SetLayersAcceleration(bool aEnabled)
 {
   if (mUseLayersAcceleration == aEnabled) {
     return NS_OK;
   }
   bool usedAcceleration = mUseLayersAcceleration;
   mUseLayersAcceleration = ComputeShouldAccelerate(aEnabled);
   // ComputeShouldAccelerate may have set mUseLayersAcceleration to a value
   // different from aEnabled.
   if (usedAcceleration == mUseLayersAcceleration) {
     return NS_OK;
   }
   if (mLayerManager) {
     mLayerManager->Destroy();
   }
   mLayerManager = nullptr;
   return NS_OK;
 }
 NS_METHOD nsBaseWidget::RegisterTouchWindow()
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_METHOD nsBaseWidget::UnregisterTouchWindow()
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 nsBaseWidget::OverrideSystemMouseScrollSpeed(double aOriginalDeltaX,
                                              double aOriginalDeltaY,
                                              double& aOverriddenDeltaX,
                                              double& aOverriddenDeltaY)
 {
   aOverriddenDeltaX = aOriginalDeltaX;
   aOverriddenDeltaY = aOriginalDeltaY;
   static bool sInitialized = false;
   static bool sIsOverrideEnabled = false;
   static int32_t sIntFactorX = 0;
   static int32_t sIntFactorY = 0;
   if (!sInitialized) {
     Preferences::AddBoolVarCache(&sIsOverrideEnabled,
       "mousewheel.system_scroll_override_on_root_content.enabled", false);
     Preferences::AddIntVarCache(&sIntFactorX,
       "mousewheel.system_scroll_override_on_root_content.horizontal.factor", 0);
     Preferences::AddIntVarCache(&sIntFactorY,
       "mousewheel.system_scroll_override_on_root_content.vertical.factor", 0);
     sIntFactorX = std::max(sIntFactorX, 0);
     sIntFactorY = std::max(sIntFactorY, 0);
     sInitialized = true;
   }
   if (!sIsOverrideEnabled) {
     return NS_OK;
   }
   // The pref value must be larger than 100, otherwise, we don't override the
   // delta value.
   if (sIntFactorX > 100) {
     double factor = static_cast<double>(sIntFactorX) / 100;
     aOverriddenDeltaX *= factor;
   }
   if (sIntFactorY > 100) {
     double factor = static_cast<double>(sIntFactorY) / 100;
     aOverriddenDeltaY *= factor;
   }
   return NS_OK;
 }
 /**
  * Modifies aFile to point at an icon file with the given name and suffix.  The
  * suffix may correspond to a file extension with leading '.' if appropriate.
  * Returns true if the icon file exists and can be read.
  */
 static bool
 ResolveIconNameHelper(nsIFile *aFile,
                       const nsAString &aIconName,
                       const nsAString &aIconSuffix)
 {
   aFile->Append(NS_LITERAL_STRING("icons"));
   aFile->Append(NS_LITERAL_STRING("default"));
   aFile->Append(aIconName + aIconSuffix);
   bool readable;
   return NS_SUCCEEDED(aFile->IsReadable(&readable)) && readable;
 }
 /**
  * Resolve the given icon name into a local file object.  This method is
  * intended to be called by subclasses of nsBaseWidget.  aIconSuffix is a
  * platform specific icon file suffix (e.g., ".ico" under Win32).
  *
  * If no file is found matching the given parameters, then null is returned.
  */
 void
 nsBaseWidget::ResolveIconName(const nsAString &aIconName,
                               const nsAString &aIconSuffix,
                               nsIFile **aResult)
 {
   *aResult = nullptr;
   nsCOMPtr<nsIProperties> dirSvc = do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID);
   if (!dirSvc)
     return;
   // first check auxilary chrome directories
   nsCOMPtr<nsISimpleEnumerator> dirs;
   dirSvc->Get(NS_APP_CHROME_DIR_LIST, NS_GET_IID(nsISimpleEnumerator),
               getter_AddRefs(dirs));
   if (dirs) {
     bool hasMore;
     while (NS_SUCCEEDED(dirs->HasMoreElements(&hasMore)) && hasMore) {
       nsCOMPtr<nsISupports> element;
       dirs->GetNext(getter_AddRefs(element));
       if (!element)
         continue;
       nsCOMPtr<nsIFile> file = do_QueryInterface(element);
       if (!file)
         continue;
       if (ResolveIconNameHelper(file, aIconName, aIconSuffix)) {
         NS_ADDREF(*aResult = file);
         return;
       }
     }
   }
   // then check the main app chrome directory
   nsCOMPtr<nsIFile> file;
   dirSvc->Get(NS_APP_CHROME_DIR, NS_GET_IID(nsIFile),
               getter_AddRefs(file));
   if (file && ResolveIconNameHelper(file, aIconName, aIconSuffix))
     NS_ADDREF(*aResult = file);
 }
 NS_IMETHODIMP
 nsBaseWidget::BeginResizeDrag(WidgetGUIEvent* aEvent,
                               int32_t aHorizontal,
                               int32_t aVertical)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 nsBaseWidget::BeginMoveDrag(WidgetMouseEvent* aEvent)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 uint32_t
 nsBaseWidget::GetGLFrameBufferFormat()
 {
   return LOCAL_GL_RGBA;
 }
 void nsBaseWidget::SetSizeConstraints(const SizeConstraints& aConstraints)
 {
   mSizeConstraints = aConstraints;
   // We can't ensure that the size is honored at this point because we're
   // probably in the middle of a reflow.
 }
 const widget::SizeConstraints& nsBaseWidget::GetSizeConstraints() const
 {
   return mSizeConstraints;
 }
 // static
 nsIRollupListener*
 nsBaseWidget::GetActiveRollupListener()
 {
   // If set, then this is likely an <html:select> dropdown.
   if (gRollupListener)
     return gRollupListener;
   return nsXULPopupManager::GetInstance();
 }
 void
 nsBaseWidget::NotifyWindowDestroyed()
 {
   if (!mWidgetListener)
     return;
   nsCOMPtr<nsIXULWindow> window = mWidgetListener->GetXULWindow();
   nsCOMPtr<nsIBaseWindow> xulWindow(do_QueryInterface(window));
   if (xulWindow) {
     xulWindow->Destroy();
   }
 }
 void
 nsBaseWidget::NotifySizeMoveDone()
 {
   if (!mWidgetListener || mWidgetListener->GetXULWindow())
     return;
   nsIPresShell* presShell = mWidgetListener->GetPresShell();
   if (presShell) {
     presShell->WindowSizeMoveDone();
   }
 }
 void
 nsBaseWidget::NotifyWindowMoved(int32_t aX, int32_t aY)
 {
   if (mWidgetListener) {
     mWidgetListener->WindowMoved(this, aX, aY);
   }
   if (GetIMEUpdatePreference().WantPositionChanged()) {
     NotifyIME(IMENotification(IMEMessage::NOTIFY_IME_OF_POSITION_CHANGE));
   }
 }
 void
 nsBaseWidget::NotifySysColorChanged()
 {
   if (!mWidgetListener || mWidgetListener->GetXULWindow())
     return;
   nsIPresShell* presShell = mWidgetListener->GetPresShell();
   if (presShell) {
     presShell->SysColorChanged();
   }
 }
 void
 nsBaseWidget::NotifyThemeChanged()
 {
   if (!mWidgetListener || mWidgetListener->GetXULWindow())
     return;
   nsIPresShell* presShell = mWidgetListener->GetPresShell();
   if (presShell) {
     presShell->ThemeChanged();
   }
 }
 void
 nsBaseWidget::NotifyUIStateChanged(UIStateChangeType aShowAccelerators,
                                    UIStateChangeType aShowFocusRings)
 {
   if (!mWidgetListener)
     return;
   nsIPresShell* presShell = mWidgetListener->GetPresShell();
   if (!presShell)
     return;
   nsIDocument* doc = presShell->GetDocument();
   if (doc) {
     nsPIDOMWindow* win = doc->GetWindow();
     if (win) {
       win->SetKeyboardIndicators(aShowAccelerators, aShowFocusRings);
     }
   }
 }
 #ifdef ACCESSIBILITY
 a11y::Accessible*
 nsBaseWidget::GetRootAccessible()
 {
   NS_ENSURE_TRUE(mWidgetListener, nullptr);
   nsIPresShell* presShell = mWidgetListener->GetPresShell();
   NS_ENSURE_TRUE(presShell, nullptr);
   // If container is null then the presshell is not active. This often happens
   // when a preshell is being held onto for fastback.
   nsPresContext* presContext = presShell->GetPresContext();
   NS_ENSURE_TRUE(presContext->GetContainerWeak(), nullptr);
   // Accessible creation might be not safe so use IsSafeToRunScript to
   // make sure it's not created at unsafe times.
   nsCOMPtr<nsIAccessibilityService> accService =
     services::GetAccessibilityService();
   if (accService) {
     return accService->GetRootDocumentAccessible(presShell, nsContentUtils::IsSafeToRunScript());
   }
   return nullptr;
 }
 #endif // ACCESSIBILITY
 nsresult
 nsIWidget::SynthesizeNativeTouchTap(nsIntPoint aPointerScreenPoint, bool aLongTap)
 {
   if (sPointerIdCounter > TOUCH_INJECT_MAX_POINTS) {
     sPointerIdCounter = 0;
   }
   int pointerId = sPointerIdCounter;
   sPointerIdCounter++;
   nsresult rv = SynthesizeNativeTouchPoint(pointerId, TOUCH_CONTACT,
                                            aPointerScreenPoint, 1.0, 90);
   if (NS_FAILED(rv)) {
     return rv;
   }
   if (!aLongTap) {
     nsresult rv = SynthesizeNativeTouchPoint(pointerId, TOUCH_REMOVE,
                                              aPointerScreenPoint, 0, 0);
     return rv;
   }
   // initiate a long tap
   int elapse = Preferences::GetInt("ui.click_hold_context_menus.delay",
                                    TOUCH_INJECT_LONG_TAP_DEFAULT_MSEC);
   if (!mLongTapTimer) {
     mLongTapTimer = do_CreateInstance(NS_TIMER_CONTRACTID, &rv);
     if (NS_FAILED(rv)) {
       SynthesizeNativeTouchPoint(pointerId, TOUCH_CANCEL,
                                  aPointerScreenPoint, 0, 0);
       return NS_ERROR_UNEXPECTED;
     }
     // Windows requires recuring events, so we set this to a smaller window
     // than the pref value.
     int timeout = elapse;
     if (timeout > TOUCH_INJECT_PUMP_TIMER_MSEC) {
       timeout = TOUCH_INJECT_PUMP_TIMER_MSEC;
     }
     mLongTapTimer->InitWithFuncCallback(OnLongTapTimerCallback, this,
                                         timeout,
                                         nsITimer::TYPE_REPEATING_SLACK);
   }
   // If we already have a long tap pending, cancel it. We only allow one long
   // tap to be active at a time.
   if (mLongTapTouchPoint) {
     SynthesizeNativeTouchPoint(mLongTapTouchPoint->mPointerId, TOUCH_CANCEL,
                                mLongTapTouchPoint->mPosition, 0, 0);
   }
   mLongTapTouchPoint = new LongTapInfo(pointerId, aPointerScreenPoint,
                                        TimeDuration::FromMilliseconds(elapse));
   return NS_OK;
 }
 // static
 void
 nsIWidget::OnLongTapTimerCallback(nsITimer* aTimer, void* aClosure)
 {
   nsIWidget *self = static_cast<nsIWidget *>(aClosure);
   if ((self->mLongTapTouchPoint->mStamp + self->mLongTapTouchPoint->mDuration) >
       TimeStamp::Now()) {
 #ifdef XP_WIN
     // Windows needs us to keep pumping feedback to the digitizer, so update
     // the pointer id with the same position.
     self->SynthesizeNativeTouchPoint(self->mLongTapTouchPoint->mPointerId,
                                      TOUCH_CONTACT,
                                      self->mLongTapTouchPoint->mPosition,
 .0, 90);
 #endif
     return;
   }
   // finished, remove the touch point
   self->mLongTapTimer->Cancel();
   self->mLongTapTimer = nullptr;
   self->SynthesizeNativeTouchPoint(self->mLongTapTouchPoint->mPointerId,
                                    TOUCH_REMOVE,
                                    self->mLongTapTouchPoint->mPosition,
 , 0);
   self->mLongTapTouchPoint = nullptr;
 }
 nsresult
 nsIWidget::ClearNativeTouchSequence()
 {
   if (!mLongTapTimer) {
     return NS_OK;
   }
   mLongTapTimer->Cancel();
   mLongTapTimer = nullptr;
   SynthesizeNativeTouchPoint(mLongTapTouchPoint->mPointerId, TOUCH_CANCEL,
                              mLongTapTouchPoint->mPosition, 0, 0);
   mLongTapTouchPoint = nullptr;
   return NS_OK;
 }
 #ifdef DEBUG
 //////////////////////////////////////////////////////////////
 //
 // Convert a GUI event message code to a string.
 // Makes it a lot easier to debug events.
 //
 // See gtk/nsWidget.cpp and windows/nsWindow.cpp
 // for a DebugPrintEvent() function that uses
 // this.
 //
 //////////////////////////////////////////////////////////////
 /* static */ nsAutoString
 nsBaseWidget::debug_GuiEventToString(WidgetGUIEvent* aGuiEvent)
 {
   NS_ASSERTION(nullptr != aGuiEvent,"cmon, null gui event.");
   nsAutoString eventName(NS_LITERAL_STRING("UNKNOWN"));
 #define _ASSIGN_eventName(_value,_name)\
 case _value: eventName.AssignLiteral(_name) ; break
   switch(aGuiEvent->message)
   {
     _ASSIGN_eventName(NS_BLUR_CONTENT,"NS_BLUR_CONTENT");
     _ASSIGN_eventName(NS_DRAGDROP_GESTURE,"NS_DND_GESTURE");
     _ASSIGN_eventName(NS_DRAGDROP_DROP,"NS_DND_DROP");
     _ASSIGN_eventName(NS_DRAGDROP_ENTER,"NS_DND_ENTER");
     _ASSIGN_eventName(NS_DRAGDROP_EXIT,"NS_DND_EXIT");
     _ASSIGN_eventName(NS_DRAGDROP_OVER,"NS_DND_OVER");
     _ASSIGN_eventName(NS_EDITOR_INPUT,"NS_EDITOR_INPUT");
     _ASSIGN_eventName(NS_FOCUS_CONTENT,"NS_FOCUS_CONTENT");
     _ASSIGN_eventName(NS_FORM_SELECTED,"NS_FORM_SELECTED");
     _ASSIGN_eventName(NS_FORM_CHANGE,"NS_FORM_CHANGE");
     _ASSIGN_eventName(NS_FORM_RESET,"NS_FORM_RESET");
     _ASSIGN_eventName(NS_FORM_SUBMIT,"NS_FORM_SUBMIT");
     _ASSIGN_eventName(NS_IMAGE_ABORT,"NS_IMAGE_ABORT");
     _ASSIGN_eventName(NS_LOAD_ERROR,"NS_LOAD_ERROR");
     _ASSIGN_eventName(NS_KEY_DOWN,"NS_KEY_DOWN");
     _ASSIGN_eventName(NS_KEY_PRESS,"NS_KEY_PRESS");
     _ASSIGN_eventName(NS_KEY_UP,"NS_KEY_UP");
     _ASSIGN_eventName(NS_MOUSE_ENTER,"NS_MOUSE_ENTER");
     _ASSIGN_eventName(NS_MOUSE_EXIT,"NS_MOUSE_EXIT");
     _ASSIGN_eventName(NS_MOUSE_BUTTON_DOWN,"NS_MOUSE_BUTTON_DOWN");
     _ASSIGN_eventName(NS_MOUSE_BUTTON_UP,"NS_MOUSE_BUTTON_UP");
     _ASSIGN_eventName(NS_MOUSE_CLICK,"NS_MOUSE_CLICK");
     _ASSIGN_eventName(NS_MOUSE_DOUBLECLICK,"NS_MOUSE_DBLCLICK");
     _ASSIGN_eventName(NS_MOUSE_MOVE,"NS_MOUSE_MOVE");
     _ASSIGN_eventName(NS_LOAD,"NS_LOAD");
     _ASSIGN_eventName(NS_POPSTATE,"NS_POPSTATE");
     _ASSIGN_eventName(NS_BEFORE_SCRIPT_EXECUTE,"NS_BEFORE_SCRIPT_EXECUTE");
     _ASSIGN_eventName(NS_AFTER_SCRIPT_EXECUTE,"NS_AFTER_SCRIPT_EXECUTE");
     _ASSIGN_eventName(NS_PAGE_UNLOAD,"NS_PAGE_UNLOAD");
     _ASSIGN_eventName(NS_HASHCHANGE,"NS_HASHCHANGE");
     _ASSIGN_eventName(NS_READYSTATECHANGE,"NS_READYSTATECHANGE");
     _ASSIGN_eventName(NS_XUL_BROADCAST, "NS_XUL_BROADCAST");
     _ASSIGN_eventName(NS_XUL_COMMAND_UPDATE, "NS_XUL_COMMAND_UPDATE");
 #undef _ASSIGN_eventName
   default:
     {
       char buf[32];
       sprintf(buf,"UNKNOWN: %d",aGuiEvent->message);
       CopyASCIItoUTF16(buf, eventName);
     }
     break;
   }
   return nsAutoString(eventName);
 }
 //////////////////////////////////////////////////////////////
 //
 // Code to deal with paint and event debug prefs.
 //
 //////////////////////////////////////////////////////////////
 struct PrefPair
 {
   const char * name;
   bool value;
 };
 static PrefPair debug_PrefValues[] =
 {
   { "nglayout.debug.crossing_event_dumping", false },
   { "nglayout.debug.event_dumping", false },
   { "nglayout.debug.invalidate_dumping", false },
   { "nglayout.debug.motion_event_dumping", false },
   { "nglayout.debug.paint_dumping", false },
   { "nglayout.debug.paint_flashing", false }
 };
 //////////////////////////////////////////////////////////////
 bool
 nsBaseWidget::debug_GetCachedBoolPref(const char * aPrefName)
 {
   NS_ASSERTION(nullptr != aPrefName,"cmon, pref name is null.");
   for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++)
   {
     if (strcmp(debug_PrefValues[i].name, aPrefName) == 0)
     {
       return debug_PrefValues[i].value;
     }
   }
   return false;
 }
 //////////////////////////////////////////////////////////////
 static void debug_SetCachedBoolPref(const char * aPrefName,bool aValue)
 {
   NS_ASSERTION(nullptr != aPrefName,"cmon, pref name is null.");
   for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++)
   {
     if (strcmp(debug_PrefValues[i].name, aPrefName) == 0)
     {
       debug_PrefValues[i].value = aValue;
       return;
     }
   }
   NS_ASSERTION(false, "cmon, this code is not reached dude.");
 }
 //////////////////////////////////////////////////////////////
 class Debug_PrefObserver MOZ_FINAL : public nsIObserver {
   public:
     NS_DECL_ISUPPORTS
     NS_DECL_NSIOBSERVER
 };
 NS_IMPL_ISUPPORTS(Debug_PrefObserver, nsIObserver)
 NS_IMETHODIMP
 Debug_PrefObserver::Observe(nsISupports* subject, const char* topic,
                             const char16_t* data)
 {
   NS_ConvertUTF16toUTF8 prefName(data);
   bool value = Preferences::GetBool(prefName.get(), false);
   debug_SetCachedBoolPref(prefName.get(), value);
   return NS_OK;
 }
 //////////////////////////////////////////////////////////////
 /* static */ void
 debug_RegisterPrefCallbacks()
 {
   static bool once = true;
   if (!once) {
     return;
   }
   once = false;
   nsCOMPtr<nsIObserver> obs(new Debug_PrefObserver());
   for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++) {
     // Initialize the pref values
     debug_PrefValues[i].value =
       Preferences::GetBool(debug_PrefValues[i].name, false);
     if (obs) {
       // Register callbacks for when these change
       Preferences::AddStrongObserver(obs, debug_PrefValues[i].name);
     }
   }
 }
 //////////////////////////////////////////////////////////////
 static int32_t
 _GetPrintCount()
 {
   static int32_t sCount = 0;
   return ++sCount;
 }
 //////////////////////////////////////////////////////////////
 /* static */ bool
 nsBaseWidget::debug_WantPaintFlashing()
 {
   return debug_GetCachedBoolPref("nglayout.debug.paint_flashing");
 }
 //////////////////////////////////////////////////////////////
 /* static */ void
 nsBaseWidget::debug_DumpEvent(FILE *                aFileOut,
                               nsIWidget *           aWidget,
                               WidgetGUIEvent*       aGuiEvent,
                               const nsAutoCString & aWidgetName,
                               int32_t               aWindowID)
 {
   if (aGuiEvent->message == NS_MOUSE_MOVE)
   {
     if (!debug_GetCachedBoolPref("nglayout.debug.motion_event_dumping"))
       return;
   }
   if (aGuiEvent->message == NS_MOUSE_ENTER ||
       aGuiEvent->message == NS_MOUSE_EXIT)
   {
     if (!debug_GetCachedBoolPref("nglayout.debug.crossing_event_dumping"))
       return;
   }
   if (!debug_GetCachedBoolPref("nglayout.debug.event_dumping"))
     return;
   NS_LossyConvertUTF16toASCII tempString(debug_GuiEventToString(aGuiEvent).get());
   fprintf(aFileOut,
           "%4d %-26s widget=%-8p name=%-12s id=0x%-6x refpt=%d,%d\n",
           _GetPrintCount(),
           tempString.get(),
           (void *) aWidget,
           aWidgetName.get(),
           aWindowID,
           aGuiEvent->refPoint.x,
           aGuiEvent->refPoint.y);
 }
 //////////////////////////////////////////////////////////////
 /* static */ void
 nsBaseWidget::debug_DumpPaintEvent(FILE *                aFileOut,
                                    nsIWidget *           aWidget,
                                    const nsIntRegion &   aRegion,
                                    const nsAutoCString & aWidgetName,
                                    int32_t               aWindowID)
 {
   NS_ASSERTION(nullptr != aFileOut,"cmon, null output FILE");
   NS_ASSERTION(nullptr != aWidget,"cmon, the widget is null");
   if (!debug_GetCachedBoolPref("nglayout.debug.paint_dumping"))
     return;
   nsIntRect rect = aRegion.GetBounds();
   fprintf(aFileOut,
           "%4d PAINT      widget=%p name=%-12s id=0x%-6x bounds-rect=%3d,%-3d %3d,%-3d",
           _GetPrintCount(),
           (void *) aWidget,
           aWidgetName.get(),
           aWindowID,
           rect.x, rect.y, rect.width, rect.height
     );
   fprintf(aFileOut,"\n");
 }
 //////////////////////////////////////////////////////////////
 /* static */ void
 nsBaseWidget::debug_DumpInvalidate(FILE *                aFileOut,
                                    nsIWidget *           aWidget,
                                    const nsIntRect *     aRect,
                                    const nsAutoCString & aWidgetName,
                                    int32_t               aWindowID)
 {
   if (!debug_GetCachedBoolPref("nglayout.debug.invalidate_dumping"))
     return;
   NS_ASSERTION(nullptr != aFileOut,"cmon, null output FILE");
   NS_ASSERTION(nullptr != aWidget,"cmon, the widget is null");
   fprintf(aFileOut,
           "%4d Invalidate widget=%p name=%-12s id=0x%-6x",
           _GetPrintCount(),
           (void *) aWidget,
           aWidgetName.get(),
           aWindowID);
   if (aRect)
   {
     fprintf(aFileOut,
             " rect=%3d,%-3d %3d,%-3d",
             aRect->x,
             aRect->y,
             aRect->width,
             aRect->height);
   }
   else
   {
     fprintf(aFileOut,
             " rect=%-15s",
             "none");
   }
   fprintf(aFileOut,"\n");
 }
 //////////////////////////////////////////////////////////////
 #endif // DEBUG

The Tor Browser / annotate

widget/xpwidgets/nsBaseWidget.cpp@44a2da4a2ab2 (annotated)

widget/xpwidgets/nsBaseWidget.cpp