The Tor Browser: layout/forms/nsTextControlFrame.cpp@97036ab72558 (annotated)

layout/forms/nsTextControlFrame.cpp@97036ab72558 (annotated)

layout/forms/nsTextControlFrame.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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/DebugOnly.h"
 #include "nsCOMPtr.h"
 #include "nsTextControlFrame.h"
 #include "nsIPlaintextEditor.h"
 #include "nsCaret.h"
 #include "nsGenericHTMLElement.h"
 #include "nsIEditor.h"
 #include "nsIEditorIMESupport.h"
 #include "nsIPhonetic.h"
 #include "nsTextFragment.h"
 #include "nsIDOMHTMLTextAreaElement.h"
 #include "nsNameSpaceManager.h"
 #include "nsINodeInfo.h"
 #include "nsFormControlFrame.h" //for registering accesskeys
 #include "nsIContent.h"
 #include "nsPresContext.h"
 #include "nsRenderingContext.h"
 #include "nsGkAtoms.h"
 #include "nsLayoutUtils.h"
 #include "nsIDOMElement.h"
 #include "nsIDOMHTMLElement.h"
 #include "nsIPresShell.h"
 #include <algorithm>
 #include "nsIDOMNodeList.h" //for selection setting helper func
 #include "nsIDOMRange.h" //for selection setting helper func
 #include "nsPIDOMWindow.h" //needed for notify selection changed to update the menus ect.
 #include "nsIDOMNode.h"
 #include "nsIDOMText.h" //for multiline getselection
 #include "nsFocusManager.h"
 #include "nsTextEditRules.h"
 #include "nsPresState.h"
 #include "nsContentList.h"
 #include "nsAttrValueInlines.h"
 #include "mozilla/dom/Selection.h"
 #include "nsContentUtils.h"
 #include "nsTextNode.h"
 #include "nsStyleSet.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/MathAlgorithms.h"
 #define DEFAULT_COLUMN_WIDTH 20
 using namespace mozilla;
 nsIFrame*
 NS_NewTextControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   return new (aPresShell) nsTextControlFrame(aPresShell, aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsTextControlFrame)
 NS_QUERYFRAME_HEAD(nsTextControlFrame)
   NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
   NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
   NS_QUERYFRAME_ENTRY(nsITextControlFrame)
   NS_QUERYFRAME_ENTRY(nsIStatefulFrame)
 NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
 #ifdef ACCESSIBILITY
 a11y::AccType
 nsTextControlFrame::AccessibleType()
 {
   return a11y::eHTMLTextFieldType;
 }
 #endif
 #ifdef DEBUG
 class EditorInitializerEntryTracker {
 public:
   explicit EditorInitializerEntryTracker(nsTextControlFrame &frame)
     : mFrame(frame)
     , mFirstEntry(false)
   {
     if (!mFrame.mInEditorInitialization) {
       mFrame.mInEditorInitialization = true;
       mFirstEntry = true;
     }
   }
   ~EditorInitializerEntryTracker()
   {
     if (mFirstEntry) {
       mFrame.mInEditorInitialization = false;
     }
   }
   bool EnteredMoreThanOnce() const { return !mFirstEntry; }
 private:
   nsTextControlFrame &mFrame;
   bool mFirstEntry;
 };
 #endif
 nsTextControlFrame::nsTextControlFrame(nsIPresShell* aShell, nsStyleContext* aContext)
   : nsContainerFrame(aContext)
   , mEditorHasBeenInitialized(false)
   , mIsProcessing(false)
 #ifdef DEBUG
   , mInEditorInitialization(false)
 #endif
 {
 }
 nsTextControlFrame::~nsTextControlFrame()
 {
 }
 void
 nsTextControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
 {
   mScrollEvent.Revoke();
   EditorInitializer* initializer = (EditorInitializer*) Properties().Get(TextControlInitializer());
   if (initializer) {
     initializer->Revoke();
     Properties().Delete(TextControlInitializer());
   }
   // Unbind the text editor state object from the frame.  The editor will live
   // on, but things like controllers will be released.
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   txtCtrl->UnbindFromFrame(this);
   nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
   nsContainerFrame::DestroyFrom(aDestructRoot);
 }
 nsIAtom*
 nsTextControlFrame::GetType() const
 {
   return nsGkAtoms::textInputFrame;
 }
 nsresult
 nsTextControlFrame::CalcIntrinsicSize(nsRenderingContext* aRenderingContext,
                                       nsSize&             aIntrinsicSize,
                                       float               aFontSizeInflation)
 {
   // Get leading and the Average/MaxAdvance char width
   nscoord lineHeight  = 0;
   nscoord charWidth   = 0;
   nscoord charMaxAdvance  = 0;
   nsRefPtr<nsFontMetrics> fontMet;
   nsresult rv =
     nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fontMet),
                                           aFontSizeInflation);
   NS_ENSURE_SUCCESS(rv, rv);
   aRenderingContext->SetFont(fontMet);
   lineHeight =
     nsHTMLReflowState::CalcLineHeight(GetContent(), StyleContext(),
                                       NS_AUTOHEIGHT, aFontSizeInflation);
   charWidth = fontMet->AveCharWidth();
   charMaxAdvance = fontMet->MaxAdvance();
   // Set the width equal to the width in characters
   int32_t cols = GetCols();
   aIntrinsicSize.width = cols * charWidth;
   // To better match IE, take the maximum character width(in twips) and remove
   // 4 pixels add this on as additional padding(internalPadding). But only do
   // this if we think we have a fixed-width font.
   if (mozilla::Abs(charWidth - charMaxAdvance) > (unsigned)nsPresContext::CSSPixelsToAppUnits(1)) {
     nscoord internalPadding =
       std::max(0, charMaxAdvance - nsPresContext::CSSPixelsToAppUnits(4));
     nscoord t = nsPresContext::CSSPixelsToAppUnits(1);
    // Round to a multiple of t
     nscoord rest = internalPadding % t;
     if (rest < t - rest) {
       internalPadding -= rest;
     } else {
       internalPadding += t - rest;
     }
     // Now add the extra padding on (so that small input sizes work well)
     aIntrinsicSize.width += internalPadding;
   } else {
     // This is to account for the anonymous <br> having a 1 twip width
     // in Full Standards mode, see BRFrame::Reflow and bug 228752.
     if (PresContext()->CompatibilityMode() == eCompatibility_FullStandards) {
       aIntrinsicSize.width += 1;
     }
   }
   // Increment width with cols * letter-spacing.
   {
     const nsStyleCoord& lsCoord = StyleText()->mLetterSpacing;
     if (eStyleUnit_Coord == lsCoord.GetUnit()) {
       nscoord letterSpacing = lsCoord.GetCoordValue();
       if (letterSpacing != 0) {
         aIntrinsicSize.width += cols * letterSpacing;
       }
     }
   }
   // Set the height equal to total number of rows (times the height of each
   // line, of course)
   aIntrinsicSize.height = lineHeight * GetRows();
   // Add in the size of the scrollbars for textarea
   if (IsTextArea()) {
     nsIFrame* first = GetFirstPrincipalChild();
     nsIScrollableFrame *scrollableFrame = do_QueryFrame(first);
     NS_ASSERTION(scrollableFrame, "Child must be scrollable");
     if (scrollableFrame) {
       nsMargin scrollbarSizes =
       scrollableFrame->GetDesiredScrollbarSizes(PresContext(), aRenderingContext);
       aIntrinsicSize.width  += scrollbarSizes.LeftRight();
       aIntrinsicSize.height += scrollbarSizes.TopBottom();;
     }
   }
   return NS_OK;
 }
 nsresult
 nsTextControlFrame::EnsureEditorInitialized()
 {
   // This method initializes our editor, if needed.
   // This code used to be called from CreateAnonymousContent(), but
   // when the editor set the initial string, it would trigger a
   // PresShell listener which called FlushPendingNotifications()
   // during frame construction. This was causing other form controls
   // to display wrong values.  Additionally, calling this every time
   // a text frame control is instantiated means that we're effectively
   // instantiating the editor for all text fields, even if they
   // never get used.  So, now this method is being called lazily only
   // when we actually need an editor.
   if (mEditorHasBeenInitialized)
     return NS_OK;
   nsIDocument* doc = mContent->GetCurrentDoc();
   NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
   nsWeakFrame weakFrame(this);
   // Flush out content on our document.  Have to do this, because script
   // blockers don't prevent the sink flushing out content and notifying in the
   // process, which can destroy frames.
   doc->FlushPendingNotifications(Flush_ContentAndNotify);
   NS_ENSURE_TRUE(weakFrame.IsAlive(), NS_ERROR_FAILURE);
   // Make sure that editor init doesn't do things that would kill us off
   // (especially off the script blockers it'll create for its DOM mutations).
   {
     nsAutoScriptBlocker scriptBlocker;
     // Time to mess with our security context... See comments in GetValue()
     // for why this is needed.
     mozilla::dom::AutoNoJSAPI nojsapi;
     // Make sure that we try to focus the content even if the method fails
     class EnsureSetFocus {
     public:
       explicit EnsureSetFocus(nsTextControlFrame* aFrame)
         : mFrame(aFrame) {}
       ~EnsureSetFocus() {
         if (nsContentUtils::IsFocusedContent(mFrame->GetContent()))
           mFrame->SetFocus(true, false);
       }
     private:
       nsTextControlFrame *mFrame;
     };
     EnsureSetFocus makeSureSetFocusHappens(this);
 #ifdef DEBUG
     // Make sure we are not being called again until we're finished.
     // If reentrancy happens, just pretend that we don't have an editor.
     const EditorInitializerEntryTracker tracker(*this);
     NS_ASSERTION(!tracker.EnteredMoreThanOnce(),
                  "EnsureEditorInitialized has been called while a previous call was in progress");
 #endif
     // Create an editor for the frame, if one doesn't already exist
     nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
     NS_ASSERTION(txtCtrl, "Content not a text control element");
     nsresult rv = txtCtrl->CreateEditor();
     NS_ENSURE_SUCCESS(rv, rv);
     NS_ENSURE_STATE(weakFrame.IsAlive());
     // Set mEditorHasBeenInitialized so that subsequent calls will use the
     // editor.
     mEditorHasBeenInitialized = true;
     // Set the selection to the beginning of the text field.
     if (weakFrame.IsAlive()) {
       SetSelectionEndPoints(0, 0);
     }
   }
   NS_ENSURE_STATE(weakFrame.IsAlive());
   return NS_OK;
 }
 nsresult
 nsTextControlFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   NS_ASSERTION(mContent, "We should have a content!");
   mState |= NS_FRAME_INDEPENDENT_SELECTION;
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   // Bind the frame to its text control
   nsresult rv = txtCtrl->BindToFrame(this);
   NS_ENSURE_SUCCESS(rv, rv);
   nsIContent* rootNode = txtCtrl->GetRootEditorNode();
   NS_ENSURE_TRUE(rootNode, NS_ERROR_OUT_OF_MEMORY);
   if (!aElements.AppendElement(rootNode))
     return NS_ERROR_OUT_OF_MEMORY;
   // Do we need a placeholder node?
   nsAutoString placeholderTxt;
   mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::placeholder,
                     placeholderTxt);
   nsContentUtils::RemoveNewlines(placeholderTxt);
   mUsePlaceholder = !placeholderTxt.IsEmpty();
   // Create the placeholder anonymous content if needed.
   if (mUsePlaceholder) {
     nsIContent* placeholderNode = txtCtrl->CreatePlaceholderNode();
     NS_ENSURE_TRUE(placeholderNode, NS_ERROR_OUT_OF_MEMORY);
     // Associate ::-moz-placeholder pseudo-element with the placeholder node.
     nsCSSPseudoElements::Type pseudoType =
       nsCSSPseudoElements::ePseudo_mozPlaceholder;
     nsRefPtr<nsStyleContext> placeholderStyleContext =
       PresContext()->StyleSet()->ResolvePseudoElementStyle(
           mContent->AsElement(), pseudoType, StyleContext(),
           placeholderNode->AsElement());
     if (!aElements.AppendElement(ContentInfo(placeholderNode,
                                  placeholderStyleContext))) {
       return NS_ERROR_OUT_OF_MEMORY;
     }
   }
   rv = UpdateValueDisplay(false);
   NS_ENSURE_SUCCESS(rv, rv);
   // textareas are eagerly initialized
   bool initEagerly = !IsSingleLineTextControl();
   if (!initEagerly) {
     // Also, input elements which have a cached selection should get eager
     // editor initialization.
     nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
     NS_ASSERTION(txtCtrl, "Content not a text control element");
     initEagerly = txtCtrl->HasCachedSelection();
   }
   if (!initEagerly) {
     nsCOMPtr<nsIDOMHTMLElement> element = do_QueryInterface(txtCtrl);
     if (element) {
       // so are input text controls with spellcheck=true
       element->GetSpellcheck(&initEagerly);
     }
   }
   if (initEagerly) {
     NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
                  "Someone forgot a script blocker?");
     EditorInitializer* initializer = (EditorInitializer*) Properties().Get(TextControlInitializer());
     if (initializer) {
       initializer->Revoke();
     }
     initializer = new EditorInitializer(this);
     Properties().Set(TextControlInitializer(),initializer);
     if (!nsContentUtils::AddScriptRunner(initializer)) {
       initializer->Revoke(); // paranoia
       Properties().Delete(TextControlInitializer());
       delete initializer;
       return NS_ERROR_OUT_OF_MEMORY;
     }
   }
   return NS_OK;
 }
 void
 nsTextControlFrame::AppendAnonymousContentTo(nsBaseContentList& aElements,
                                              uint32_t aFilter)
 {
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   aElements.MaybeAppendElement(txtCtrl->GetRootEditorNode());
   if (!(aFilter & nsIContent::eSkipPlaceholderContent))
     aElements.MaybeAppendElement(txtCtrl->GetPlaceholderNode());
 }
 nscoord
 nsTextControlFrame::GetPrefWidth(nsRenderingContext* aRenderingContext)
 {
     DebugOnly<nscoord> result = 0;
     DISPLAY_PREF_WIDTH(this, result);
     float inflation = nsLayoutUtils::FontSizeInflationFor(this);
     nsSize autoSize;
     CalcIntrinsicSize(aRenderingContext, autoSize, inflation);
     return autoSize.width;
 }
 nscoord
 nsTextControlFrame::GetMinWidth(nsRenderingContext* aRenderingContext)
 {
   // Our min width is just our preferred width if we have auto width.
   nscoord result;
   DISPLAY_MIN_WIDTH(this, result);
   result = GetPrefWidth(aRenderingContext);
   return result;
 }
 nsSize
 nsTextControlFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
                                     nsSize aCBSize, nscoord aAvailableWidth,
                                     nsSize aMargin, nsSize aBorder,
                                     nsSize aPadding, bool aShrinkWrap)
 {
   float inflation = nsLayoutUtils::FontSizeInflationFor(this);
   nsSize autoSize;
   nsresult rv = CalcIntrinsicSize(aRenderingContext, autoSize, inflation);
   if (NS_FAILED(rv)) {
     // What now?
     autoSize.SizeTo(0, 0);
   }
 #ifdef DEBUG
   // Note: Ancestor ComputeAutoSize only computes a width if we're auto-width
   else if (StylePosition()->mWidth.GetUnit() == eStyleUnit_Auto) {
     nsSize ancestorAutoSize =
       nsContainerFrame::ComputeAutoSize(aRenderingContext,
                                         aCBSize, aAvailableWidth,
                                         aMargin, aBorder,
                                         aPadding, aShrinkWrap);
     // Disabled when there's inflation; see comment in GetPrefSize.
     NS_ASSERTION(inflation != 1.0f || ancestorAutoSize.width == autoSize.width,
                  "Incorrect size computed by ComputeAutoSize?");
   }
 #endif
   return autoSize;
 }
 nsresult
 nsTextControlFrame::Reflow(nsPresContext*   aPresContext,
                            nsHTMLReflowMetrics&     aDesiredSize,
                            const nsHTMLReflowState& aReflowState,
                            nsReflowStatus&          aStatus)
 {
   DO_GLOBAL_REFLOW_COUNT("nsTextControlFrame");
   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
   // make sure that the form registers itself on the initial/first reflow
   if (mState & NS_FRAME_FIRST_REFLOW) {
     nsFormControlFrame::RegUnRegAccessKey(this, true);
   }
   // set values of reflow's out parameters
   aDesiredSize.Width() = aReflowState.ComputedWidth() +
                        aReflowState.ComputedPhysicalBorderPadding().LeftRight();
   aDesiredSize.Height() = aReflowState.ComputedHeight() +
                         aReflowState.ComputedPhysicalBorderPadding().TopBottom();
   // computation of the ascent wrt the input height
   nscoord lineHeight = aReflowState.ComputedHeight();
   float inflation = nsLayoutUtils::FontSizeInflationFor(this);
   if (!IsSingleLineTextControl()) {
     lineHeight = nsHTMLReflowState::CalcLineHeight(GetContent(), StyleContext(),
                                                    NS_AUTOHEIGHT, inflation);
   }
   nsRefPtr<nsFontMetrics> fontMet;
   nsresult rv = nsLayoutUtils::GetFontMetricsForFrame(this,
                                                       getter_AddRefs(fontMet),
                                                       inflation);
   NS_ENSURE_SUCCESS(rv, rv);
   // now adjust for our borders and padding
   aDesiredSize.SetTopAscent(
         nsLayoutUtils::GetCenteredFontBaseline(fontMet, lineHeight)
         + aReflowState.ComputedPhysicalBorderPadding().top);
   // overflow handling
   aDesiredSize.SetOverflowAreasToDesiredBounds();
   // perform reflow on all kids
   nsIFrame* kid = mFrames.FirstChild();
   while (kid) {
     ReflowTextControlChild(kid, aPresContext, aReflowState, aStatus, aDesiredSize);
     kid = kid->GetNextSibling();
   }
   // take into account css properties that affect overflow handling
   FinishAndStoreOverflow(&aDesiredSize);
   aStatus = NS_FRAME_COMPLETE;
   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
   return NS_OK;
 }
 void
 nsTextControlFrame::ReflowTextControlChild(nsIFrame*                aKid,
                                            nsPresContext*           aPresContext,
                                            const nsHTMLReflowState& aReflowState,
                                            nsReflowStatus&          aStatus,
                                            nsHTMLReflowMetrics& aParentDesiredSize)
 {
   // compute available size and frame offsets for child
   nsSize availSize(aReflowState.ComputedWidth() +
                    aReflowState.ComputedPhysicalPadding().LeftRight(),
                    NS_UNCONSTRAINEDSIZE);
   nsHTMLReflowState kidReflowState(aPresContext, aReflowState,
                                    aKid, availSize, -1, -1, nsHTMLReflowState::CALLER_WILL_INIT);
   // Override padding with our computed padding in case we got it from theming or percentage
   kidReflowState.Init(aPresContext, -1, -1, nullptr, &aReflowState.ComputedPhysicalPadding());
   // Set computed width and computed height for the child
   kidReflowState.SetComputedWidth(aReflowState.ComputedWidth());
   kidReflowState.SetComputedHeight(aReflowState.ComputedHeight());
   // Offset the frame by the size of the parent's border
   nscoord xOffset = aReflowState.ComputedPhysicalBorderPadding().left -
                     aReflowState.ComputedPhysicalPadding().left;
   nscoord yOffset = aReflowState.ComputedPhysicalBorderPadding().top -
                     aReflowState.ComputedPhysicalPadding().top;
   // reflow the child
   nsHTMLReflowMetrics desiredSize(aReflowState);
   ReflowChild(aKid, aPresContext, desiredSize, kidReflowState,
               xOffset, yOffset, 0, aStatus);
   // place the child
   FinishReflowChild(aKid, aPresContext, desiredSize,
                     &kidReflowState, xOffset, yOffset, 0);
   // consider the overflow
   aParentDesiredSize.mOverflowAreas.UnionWith(desiredSize.mOverflowAreas);
 }
 nsSize
 nsTextControlFrame::GetMinSize(nsBoxLayoutState& aState)
 {
   // XXXbz why?  Why not the nsBoxFrame sizes?
   return nsBox::GetMinSize(aState);
 }
 bool
 nsTextControlFrame::IsCollapsed()
 {
   // We're never collapsed in the box sense.
   return false;
 }
 bool
 nsTextControlFrame::IsLeaf() const
 {
   return true;
 }
 NS_IMETHODIMP
 nsTextControlFrame::ScrollOnFocusEvent::Run()
 {
   if (mFrame) {
     nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(mFrame->GetContent());
     NS_ASSERTION(txtCtrl, "Content not a text control element");
     nsISelectionController* selCon = txtCtrl->GetSelectionController();
     if (selCon) {
       mFrame->mScrollEvent.Forget();
       selCon->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
                                       nsISelectionController::SELECTION_FOCUS_REGION,
                                       nsISelectionController::SCROLL_SYNCHRONOUS);
     }
   }
   return NS_OK;
 }
 //IMPLEMENTING NS_IFORMCONTROLFRAME
 void nsTextControlFrame::SetFocus(bool aOn, bool aRepaint)
 {
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   // Revoke the previous scroll event if one exists
   mScrollEvent.Revoke();
   // If 'dom.placeholeder.show_on_focus' preference is 'false', focusing or
   // blurring the frame can have an impact on the placeholder visibility.
   if (mUsePlaceholder) {
     txtCtrl->UpdatePlaceholderVisibility(true);
   }
   if (!aOn) {
     return;
   }
   nsISelectionController* selCon = txtCtrl->GetSelectionController();
   if (!selCon)
     return;
   nsCOMPtr<nsISelection> ourSel;
   selCon->GetSelection(nsISelectionController::SELECTION_NORMAL,
     getter_AddRefs(ourSel));
   if (!ourSel) return;
   nsIPresShell* presShell = PresContext()->GetPresShell();
   nsRefPtr<nsCaret> caret = presShell->GetCaret();
   if (!caret) return;
   // Scroll the current selection into view
   nsISelection *caretSelection = caret->GetCaretDOMSelection();
   const bool isFocusedRightNow = ourSel == caretSelection;
   if (!isFocusedRightNow) {
     // Don't scroll the current selection if we've been focused using the mouse.
     uint32_t lastFocusMethod = 0;
     nsIDocument* doc = GetContent()->GetCurrentDoc();
     if (doc) {
       nsIFocusManager* fm = nsFocusManager::GetFocusManager();
       if (fm) {
         fm->GetLastFocusMethod(doc->GetWindow(), &lastFocusMethod);
       }
     }
     if (!(lastFocusMethod & nsIFocusManager::FLAG_BYMOUSE)) {
       nsRefPtr<ScrollOnFocusEvent> event = new ScrollOnFocusEvent(this);
       nsresult rv = NS_DispatchToCurrentThread(event);
       if (NS_SUCCEEDED(rv)) {
         mScrollEvent = event;
       }
     }
   }
   // tell the caret to use our selection
   caret->SetCaretDOMSelection(ourSel);
   // mutual-exclusion: the selection is either controlled by the
   // document or by the text input/area. Clear any selection in the
   // document since the focus is now on our independent selection.
   nsCOMPtr<nsISelectionController> selcon = do_QueryInterface(presShell);
   nsCOMPtr<nsISelection> docSel;
   selcon->GetSelection(nsISelectionController::SELECTION_NORMAL,
     getter_AddRefs(docSel));
   if (!docSel) return;
   bool isCollapsed = false;
   docSel->GetIsCollapsed(&isCollapsed);
   if (!isCollapsed)
     docSel->RemoveAllRanges();
 }
 nsresult nsTextControlFrame::SetFormProperty(nsIAtom* aName, const nsAString& aValue)
 {
   if (!mIsProcessing)//some kind of lock.
   {
     mIsProcessing = true;
     if (nsGkAtoms::select == aName)
     {
       // Select all the text.
       //
       // XXX: This is lame, we can't call editor's SelectAll method
       //      because that triggers AutoCopies in unix builds.
       //      Instead, we have to call our own homegrown version
       //      of select all which merely builds a range that selects
       //      all of the content and adds that to the selection.
       nsWeakFrame weakThis = this;
       SelectAllOrCollapseToEndOfText(true);  // NOTE: can destroy the world
       if (!weakThis.IsAlive()) {
         return NS_OK;
       }
     }
     mIsProcessing = false;
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsTextControlFrame::GetEditor(nsIEditor **aEditor)
 {
   NS_ENSURE_ARG_POINTER(aEditor);
   nsresult rv = EnsureEditorInitialized();
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   *aEditor = txtCtrl->GetTextEditor();
   NS_IF_ADDREF(*aEditor);
   return NS_OK;
 }
 nsresult
 nsTextControlFrame::SetSelectionInternal(nsIDOMNode *aStartNode,
                                          int32_t aStartOffset,
                                          nsIDOMNode *aEndNode,
                                          int32_t aEndOffset,
                                          nsITextControlFrame::SelectionDirection aDirection)
 {
   // Create a new range to represent the new selection.
   // Note that we use a new range to avoid having to do
   // isIncreasing checks to avoid possible errors.
   nsRefPtr<nsRange> range = new nsRange(mContent);
   nsresult rv = range->SetStart(aStartNode, aStartOffset);
   NS_ENSURE_SUCCESS(rv, rv);
   rv = range->SetEnd(aEndNode, aEndOffset);
   NS_ENSURE_SUCCESS(rv, rv);
   // Get the selection, clear it and add the new range to it!
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   nsISelectionController* selCon = txtCtrl->GetSelectionController();
   NS_ENSURE_TRUE(selCon, NS_ERROR_FAILURE);
   nsCOMPtr<nsISelection> selection;
   selCon->GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(selection));
   NS_ENSURE_TRUE(selection, NS_ERROR_FAILURE);
   nsCOMPtr<nsISelectionPrivate> selPriv = do_QueryInterface(selection, &rv);
   NS_ENSURE_SUCCESS(rv, rv);
   nsDirection direction;
   if (aDirection == eNone) {
     // Preserve the direction
     direction = selPriv->GetSelectionDirection();
   } else {
     direction = (aDirection == eBackward) ? eDirPrevious : eDirNext;
   }
   rv = selection->RemoveAllRanges();
   NS_ENSURE_SUCCESS(rv, rv);
   rv = selection->AddRange(range);  // NOTE: can destroy the world
   NS_ENSURE_SUCCESS(rv, rv);
   selPriv->SetSelectionDirection(direction);
   return rv;
 }
 nsresult
 nsTextControlFrame::ScrollSelectionIntoView()
 {
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   nsISelectionController* selCon = txtCtrl->GetSelectionController();
   if (selCon) {
     // Scroll the selection into view (see bug 231389).
     return selCon->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
                                            nsISelectionController::SELECTION_FOCUS_REGION,
                                            nsISelectionController::SCROLL_FIRST_ANCESTOR_ONLY);
   }
   return NS_ERROR_FAILURE;
 }
 mozilla::dom::Element*
 nsTextControlFrame::GetRootNodeAndInitializeEditor()
 {
   nsCOMPtr<nsIDOMElement> root;
   GetRootNodeAndInitializeEditor(getter_AddRefs(root));
   nsCOMPtr<mozilla::dom::Element> rootElem = do_QueryInterface(root);
   return rootElem;
 }
 nsresult
 nsTextControlFrame::GetRootNodeAndInitializeEditor(nsIDOMElement **aRootElement)
 {
   NS_ENSURE_ARG_POINTER(aRootElement);
   nsCOMPtr<nsIEditor> editor;
   GetEditor(getter_AddRefs(editor));
   if (!editor)
     return NS_OK;
   return editor->GetRootElement(aRootElement);
 }
 nsresult
 nsTextControlFrame::SelectAllOrCollapseToEndOfText(bool aSelect)
 {
   nsCOMPtr<nsIDOMElement> rootElement;
   nsresult rv = GetRootNodeAndInitializeEditor(getter_AddRefs(rootElement));
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIContent> rootContent = do_QueryInterface(rootElement);
   nsCOMPtr<nsIDOMNode> rootNode(do_QueryInterface(rootElement));
   NS_ENSURE_TRUE(rootNode && rootContent, NS_ERROR_FAILURE);
   int32_t numChildren = rootContent->GetChildCount();
   if (numChildren > 0) {
     // We never want to place the selection after the last
     // br under the root node!
     nsIContent *child = rootContent->GetChildAt(numChildren - 1);
     if (child) {
       if (child->Tag() == nsGkAtoms::br)
         --numChildren;
     }
     if (!aSelect && numChildren) {
       child = rootContent->GetChildAt(numChildren - 1);
       if (child && child->IsNodeOfType(nsINode::eTEXT)) {
         rootNode = do_QueryInterface(child);
         const nsTextFragment* fragment = child->GetText();
         numChildren = fragment ? fragment->GetLength() : 0;
       }
     }
   }
   rv = SetSelectionInternal(rootNode, aSelect ? 0 : numChildren,
                             rootNode, numChildren);
   NS_ENSURE_SUCCESS(rv, rv);
   return ScrollSelectionIntoView();
 }
 nsresult
 nsTextControlFrame::SetSelectionEndPoints(int32_t aSelStart, int32_t aSelEnd,
                                           nsITextControlFrame::SelectionDirection aDirection)
 {
   NS_ASSERTION(aSelStart <= aSelEnd, "Invalid selection offsets!");
   if (aSelStart > aSelEnd)
     return NS_ERROR_FAILURE;
   nsCOMPtr<nsIDOMNode> startNode, endNode;
   int32_t startOffset, endOffset;
   // Calculate the selection start point.
   nsresult rv = OffsetToDOMPoint(aSelStart, getter_AddRefs(startNode), &startOffset);
   NS_ENSURE_SUCCESS(rv, rv);
   if (aSelStart == aSelEnd) {
     // Collapsed selection, so start and end are the same!
     endNode   = startNode;
     endOffset = startOffset;
   }
   else {
     // Selection isn't collapsed so we have to calculate
     // the end point too.
     rv = OffsetToDOMPoint(aSelEnd, getter_AddRefs(endNode), &endOffset);
     NS_ENSURE_SUCCESS(rv, rv);
   }
   return SetSelectionInternal(startNode, startOffset, endNode, endOffset, aDirection);
 }
 NS_IMETHODIMP
 nsTextControlFrame::SetSelectionRange(int32_t aSelStart, int32_t aSelEnd,
                                       nsITextControlFrame::SelectionDirection aDirection)
 {
   nsresult rv = EnsureEditorInitialized();
   NS_ENSURE_SUCCESS(rv, rv);
   if (aSelStart > aSelEnd) {
     // Simulate what we'd see SetSelectionStart() was called, followed
     // by a SetSelectionEnd().
     aSelStart   = aSelEnd;
   }
   return SetSelectionEndPoints(aSelStart, aSelEnd, aDirection);
 }
 NS_IMETHODIMP
 nsTextControlFrame::SetSelectionStart(int32_t aSelectionStart)
 {
   nsresult rv = EnsureEditorInitialized();
   NS_ENSURE_SUCCESS(rv, rv);
   int32_t selStart = 0, selEnd = 0;
   rv = GetSelectionRange(&selStart, &selEnd);
   NS_ENSURE_SUCCESS(rv, rv);
   if (aSelectionStart > selEnd) {
     // Collapse to the new start point.
     selEnd = aSelectionStart;
   }
   selStart = aSelectionStart;
   return SetSelectionEndPoints(selStart, selEnd);
 }
 NS_IMETHODIMP
 nsTextControlFrame::SetSelectionEnd(int32_t aSelectionEnd)
 {
   nsresult rv = EnsureEditorInitialized();
   NS_ENSURE_SUCCESS(rv, rv);
   int32_t selStart = 0, selEnd = 0;
   rv = GetSelectionRange(&selStart, &selEnd);
   NS_ENSURE_SUCCESS(rv, rv);
   if (aSelectionEnd < selStart) {
     // Collapse to the new end point.
     selStart = aSelectionEnd;
   }
   selEnd = aSelectionEnd;
   return SetSelectionEndPoints(selStart, selEnd);
 }
 nsresult
 nsTextControlFrame::OffsetToDOMPoint(int32_t aOffset,
                                      nsIDOMNode** aResult,
                                      int32_t* aPosition)
 {
   NS_ENSURE_ARG_POINTER(aResult && aPosition);
   *aResult = nullptr;
   *aPosition = 0;
   nsCOMPtr<nsIDOMElement> rootElement;
   nsresult rv = GetRootNodeAndInitializeEditor(getter_AddRefs(rootElement));
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIDOMNode> rootNode(do_QueryInterface(rootElement));
   NS_ENSURE_TRUE(rootNode, NS_ERROR_FAILURE);
   nsCOMPtr<nsIDOMNodeList> nodeList;
   rv = rootNode->GetChildNodes(getter_AddRefs(nodeList));
   NS_ENSURE_SUCCESS(rv, rv);
   NS_ENSURE_TRUE(nodeList, NS_ERROR_FAILURE);
   uint32_t length = 0;
   rv = nodeList->GetLength(&length);
   NS_ENSURE_SUCCESS(rv, rv);
   NS_ASSERTION(length <= 2, "We should have one text node and one mozBR at most");
   nsCOMPtr<nsIDOMNode> firstNode;
   rv = nodeList->Item(0, getter_AddRefs(firstNode));
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIDOMText> textNode = do_QueryInterface(firstNode);
   if (length == 0 || aOffset < 0) {
     NS_IF_ADDREF(*aResult = rootNode);
     *aPosition = 0;
   } else if (textNode) {
     uint32_t textLength = 0;
     textNode->GetLength(&textLength);
     if (length == 2 && uint32_t(aOffset) == textLength) {
       // If we're at the end of the text node and we have a trailing BR node,
       // set the selection on the BR node.
       NS_IF_ADDREF(*aResult = rootNode);
       *aPosition = 1;
     } else {
       // Otherwise, set the selection on the textnode itself.
       NS_IF_ADDREF(*aResult = firstNode);
       *aPosition = std::min(aOffset, int32_t(textLength));
     }
   } else {
     NS_IF_ADDREF(*aResult = rootNode);
     *aPosition = 0;
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsTextControlFrame::GetSelectionRange(int32_t* aSelectionStart,
                                       int32_t* aSelectionEnd,
                                       SelectionDirection* aDirection)
 {
   // make sure we have an editor
   nsresult rv = EnsureEditorInitialized();
   NS_ENSURE_SUCCESS(rv, rv);
   if (aSelectionStart) {
     *aSelectionStart = 0;
   }
   if (aSelectionEnd) {
     *aSelectionEnd = 0;
   }
   if (aDirection) {
     *aDirection = eNone;
   }
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   nsISelectionController* selCon = txtCtrl->GetSelectionController();
   NS_ENSURE_TRUE(selCon, NS_ERROR_FAILURE);
   nsCOMPtr<nsISelection> selection;
   rv = selCon->GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(rv, rv);
   NS_ENSURE_TRUE(selection, NS_ERROR_FAILURE);
   dom::Selection* sel = static_cast<dom::Selection*>(selection.get());
   if (aDirection) {
     nsDirection direction = sel->GetSelectionDirection();
     if (direction == eDirNext) {
       *aDirection = eForward;
     } else if (direction == eDirPrevious) {
       *aDirection = eBackward;
     } else {
       NS_NOTREACHED("Invalid nsDirection enum value");
     }
   }
   if (!aSelectionStart || !aSelectionEnd) {
     return NS_OK;
   }
   mozilla::dom::Element* root = GetRootNodeAndInitializeEditor();
   NS_ENSURE_STATE(root);
   nsContentUtils::GetSelectionInTextControl(sel, root,
                                             *aSelectionStart, *aSelectionEnd);
   return NS_OK;
 }
 /////END INTERFACE IMPLEMENTATIONS
 ////NSIFRAME
 nsresult
 nsTextControlFrame::AttributeChanged(int32_t         aNameSpaceID,
                                      nsIAtom*        aAttribute,
                                      int32_t         aModType)
 {
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   nsISelectionController* selCon = txtCtrl->GetSelectionController();
   const bool needEditor = nsGkAtoms::maxlength == aAttribute ||
                             nsGkAtoms::readonly == aAttribute ||
                             nsGkAtoms::disabled == aAttribute ||
                             nsGkAtoms::spellcheck == aAttribute;
   nsCOMPtr<nsIEditor> editor;
   if (needEditor) {
     GetEditor(getter_AddRefs(editor));
   }
   if ((needEditor && !editor) || !selCon) {
     return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
   }
   if (nsGkAtoms::maxlength == aAttribute) {
     int32_t maxLength;
     bool maxDefined = GetMaxLength(&maxLength);
     nsCOMPtr<nsIPlaintextEditor> textEditor = do_QueryInterface(editor);
     if (textEditor) {
       if (maxDefined) { // set the maxLength attribute
         textEditor->SetMaxTextLength(maxLength);
         // if maxLength>docLength, we need to truncate the doc content
       } else { // unset the maxLength attribute
         textEditor->SetMaxTextLength(-1);
       }
     }
     return NS_OK;
   }
   if (nsGkAtoms::readonly == aAttribute) {
     uint32_t flags;
     editor->GetFlags(&flags);
     if (AttributeExists(nsGkAtoms::readonly)) { // set readonly
       flags |= nsIPlaintextEditor::eEditorReadonlyMask;
       if (nsContentUtils::IsFocusedContent(mContent)) {
         selCon->SetCaretEnabled(false);
       }
     } else { // unset readonly
       flags &= ~(nsIPlaintextEditor::eEditorReadonlyMask);
       if (!(flags & nsIPlaintextEditor::eEditorDisabledMask) &&
           nsContentUtils::IsFocusedContent(mContent)) {
         selCon->SetCaretEnabled(true);
       }
     }
     editor->SetFlags(flags);
     return NS_OK;
   }
   if (nsGkAtoms::disabled == aAttribute) {
     uint32_t flags;
     editor->GetFlags(&flags);
     int16_t displaySelection = nsISelectionController::SELECTION_OFF;
     const bool focused = nsContentUtils::IsFocusedContent(mContent);
     const bool hasAttr = AttributeExists(nsGkAtoms::disabled);
     if (hasAttr) { // set disabled
       flags |= nsIPlaintextEditor::eEditorDisabledMask;
     } else { // unset disabled
       flags &= ~(nsIPlaintextEditor::eEditorDisabledMask);
       displaySelection = focused ? nsISelectionController::SELECTION_ON
                                  : nsISelectionController::SELECTION_HIDDEN;
     }
     selCon->SetDisplaySelection(displaySelection);
     if (focused) {
       selCon->SetCaretEnabled(!hasAttr);
     }
     editor->SetFlags(flags);
     return NS_OK;
   }
   if (!mEditorHasBeenInitialized && nsGkAtoms::value == aAttribute) {
     UpdateValueDisplay(true);
     return NS_OK;
   }
   // Allow the base class to handle common attributes supported by all form
   // elements...
   return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
 }
 nsresult
 nsTextControlFrame::GetText(nsString& aText)
 {
   nsresult rv = NS_OK;
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   if (IsSingleLineTextControl()) {
     // There will be no line breaks so we can ignore the wrap property.
     txtCtrl->GetTextEditorValue(aText, true);
   } else {
     nsCOMPtr<nsIDOMHTMLTextAreaElement> textArea = do_QueryInterface(mContent);
     if (textArea) {
       rv = textArea->GetValue(aText);
     }
   }
   return rv;
 }
 nsresult
 nsTextControlFrame::GetPhonetic(nsAString& aPhonetic)
 {
   aPhonetic.Truncate(0);
   nsCOMPtr<nsIEditor> editor;
   nsresult rv = GetEditor(getter_AddRefs(editor));
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIEditorIMESupport> imeSupport = do_QueryInterface(editor);
   if (imeSupport) {
     nsCOMPtr<nsIPhonetic> phonetic = do_QueryInterface(imeSupport);
     if (phonetic)
       phonetic->GetPhonetic(aPhonetic);
   }
   return NS_OK;
 }
 ///END NSIFRAME OVERLOADS
 /////BEGIN PROTECTED METHODS
 bool
 nsTextControlFrame::GetMaxLength(int32_t* aSize)
 {
   *aSize = -1;
   nsGenericHTMLElement *content = nsGenericHTMLElement::FromContent(mContent);
   if (content) {
     const nsAttrValue* attr = content->GetParsedAttr(nsGkAtoms::maxlength);
     if (attr && attr->Type() == nsAttrValue::eInteger) {
       *aSize = attr->GetIntegerValue();
       return true;
     }
   }
   return false;
 }
 // END IMPLEMENTING NS_IFORMCONTROLFRAME
 nsresult
 nsTextControlFrame::SetInitialChildList(ChildListID     aListID,
                                         nsFrameList&    aChildList)
 {
   nsresult rv = nsContainerFrame::SetInitialChildList(aListID, aChildList);
   nsIFrame* first = GetFirstPrincipalChild();
   // Mark the scroll frame as being a reflow root. This will allow
   // incremental reflows to be initiated at the scroll frame, rather
   // than descending from the root frame of the frame hierarchy.
   if (first) {
     first->AddStateBits(NS_FRAME_REFLOW_ROOT);
     nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
     NS_ASSERTION(txtCtrl, "Content not a text control element");
     txtCtrl->InitializeKeyboardEventListeners();
     nsPoint* contentScrollPos = static_cast<nsPoint*>
       (Properties().Get(ContentScrollPos()));
     if (contentScrollPos) {
       // If we have a scroll pos stored to be passed to our anonymous
       // div, do it here!
       nsIStatefulFrame* statefulFrame = do_QueryFrame(first);
       NS_ASSERTION(statefulFrame, "unexpected type of frame for the anonymous div");
       nsPresState fakePresState;
       fakePresState.SetScrollState(*contentScrollPos);
       statefulFrame->RestoreState(&fakePresState);
       Properties().Remove(ContentScrollPos());
       delete contentScrollPos;
     }
   }
   return rv;
 }
 void
 nsTextControlFrame::SetValueChanged(bool aValueChanged)
 {
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   if (mUsePlaceholder) {
     nsWeakFrame weakFrame(this);
     txtCtrl->UpdatePlaceholderVisibility(true);
     if (!weakFrame.IsAlive()) {
       return;
     }
   }
   txtCtrl->SetValueChanged(aValueChanged);
 }
 nsresult
 nsTextControlFrame::UpdateValueDisplay(bool aNotify,
                                        bool aBeforeEditorInit,
                                        const nsAString *aValue)
 {
   if (!IsSingleLineTextControl()) // textareas don't use this
     return NS_OK;
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   nsIContent* rootNode = txtCtrl->GetRootEditorNode();
   NS_PRECONDITION(rootNode, "Must have a div content\n");
   NS_PRECONDITION(!mEditorHasBeenInitialized,
                   "Do not call this after editor has been initialized");
   NS_ASSERTION(!mUsePlaceholder || txtCtrl->GetPlaceholderNode(),
                "A placeholder div must exist");
   nsIContent *textContent = rootNode->GetChildAt(0);
   if (!textContent) {
     // Set up a textnode with our value
     nsRefPtr<nsTextNode> textNode =
       new nsTextNode(mContent->NodeInfo()->NodeInfoManager());
     NS_ASSERTION(textNode, "Must have textcontent!\n");
     rootNode->AppendChildTo(textNode, aNotify);
     textContent = textNode;
   }
   NS_ENSURE_TRUE(textContent, NS_ERROR_UNEXPECTED);
   // Get the current value of the textfield from the content.
   nsAutoString value;
   if (aValue) {
     value = *aValue;
   } else {
     txtCtrl->GetTextEditorValue(value, true);
   }
   // Update the display of the placeholder value if needed.
   // We don't need to do this if we're about to initialize the
   // editor, since EnsureEditorInitialized takes care of this.
   if (mUsePlaceholder && !aBeforeEditorInit)
   {
     nsWeakFrame weakFrame(this);
     txtCtrl->UpdatePlaceholderVisibility(aNotify);
     NS_ENSURE_STATE(weakFrame.IsAlive());
   }
   if (aBeforeEditorInit && value.IsEmpty()) {
     rootNode->RemoveChildAt(0, true);
     return NS_OK;
   }
   if (!value.IsEmpty() && IsPasswordTextControl()) {
     nsTextEditRules::FillBufWithPWChars(&value, value.Length());
   }
   return textContent->SetText(value, aNotify);
 }
 NS_IMETHODIMP
 nsTextControlFrame::GetOwnedSelectionController(nsISelectionController** aSelCon)
 {
   NS_ENSURE_ARG_POINTER(aSelCon);
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   *aSelCon = txtCtrl->GetSelectionController();
   NS_IF_ADDREF(*aSelCon);
   return NS_OK;
 }
 nsFrameSelection*
 nsTextControlFrame::GetOwnedFrameSelection()
 {
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   return txtCtrl->GetConstFrameSelection();
 }
 NS_IMETHODIMP
 nsTextControlFrame::SaveState(nsPresState** aState)
 {
   NS_ENSURE_ARG_POINTER(aState);
   *aState = nullptr;
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   nsIContent* rootNode = txtCtrl->GetRootEditorNode();
   if (rootNode) {
     // Query the nsIStatefulFrame from the HTMLScrollFrame
     nsIStatefulFrame* scrollStateFrame = do_QueryFrame(rootNode->GetPrimaryFrame());
     if (scrollStateFrame) {
       return scrollStateFrame->SaveState(aState);
     }
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsTextControlFrame::RestoreState(nsPresState* aState)
 {
   NS_ENSURE_ARG_POINTER(aState);
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   nsIContent* rootNode = txtCtrl->GetRootEditorNode();
   if (rootNode) {
     // Query the nsIStatefulFrame from the HTMLScrollFrame
     nsIStatefulFrame* scrollStateFrame = do_QueryFrame(rootNode->GetPrimaryFrame());
     if (scrollStateFrame) {
       return scrollStateFrame->RestoreState(aState);
     }
   }
   // Most likely, we don't have our anonymous content constructed yet, which
   // would cause us to end up here.  In this case, we'll just store the scroll
   // pos ourselves, and forward it to the scroll frame later when it's created.
   Properties().Set(ContentScrollPos(), new nsPoint(aState->GetScrollState()));
   return NS_OK;
 }
 nsresult
 nsTextControlFrame::PeekOffset(nsPeekOffsetStruct *aPos)
 {
   return NS_ERROR_FAILURE;
 }
 void
 nsTextControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                      const nsRect&           aDirtyRect,
                                      const nsDisplayListSet& aLists)
 {
   /*
    * The implementation of this method is equivalent as:
    * nsContainerFrame::BuildDisplayList()
    * with the difference that we filter-out the placeholder frame when it
    * should not be visible.
    */
   DO_GLOBAL_REFLOW_COUNT_DSP("nsTextControlFrame");
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element!");
   DisplayBorderBackgroundOutline(aBuilder, aLists);
   nsIFrame* kid = mFrames.FirstChild();
   // Redirect all lists to the Content list so that nothing can escape, ie
   // opacity creating stacking contexts that then get sorted with stacking
   // contexts external to us.
   nsDisplayList* content = aLists.Content();
   nsDisplayListSet set(content, content, content, content, content, content);
   while (kid) {
     // If the frame is the placeholder frame, we should only show it if the
     // placeholder has to be visible.
     if (kid->GetContent() != txtCtrl->GetPlaceholderNode() ||
         txtCtrl->GetPlaceholderVisibility()) {
       BuildDisplayListForChild(aBuilder, kid, aDirtyRect, set, 0);
     }
     kid = kid->GetNextSibling();
   }
 }
 mozilla::dom::Element*
 nsTextControlFrame::GetPseudoElement(nsCSSPseudoElements::Type aType)
 {
   if (aType == nsCSSPseudoElements::ePseudo_mozPlaceholder) {
     nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
     return txtCtrl->GetPlaceholderNode();
   }
   return nsContainerFrame::GetPseudoElement(aType);
 }
 NS_IMETHODIMP
 nsTextControlFrame::EditorInitializer::Run()
 {
   if (!mFrame) {
     return NS_OK;
   }
   // Need to block script to avoid bug 669767.
   nsAutoScriptBlocker scriptBlocker;
   nsCOMPtr<nsIPresShell> shell =
     mFrame->PresContext()->GetPresShell();
   bool observes = shell->ObservesNativeAnonMutationsForPrint();
   shell->ObserveNativeAnonMutationsForPrint(true);
   // This can cause the frame to be destroyed (and call Revoke()).
   mFrame->EnsureEditorInitialized();
   shell->ObserveNativeAnonMutationsForPrint(observes);
   // The frame can *still* be destroyed even though we have a scriptblocker,
   // bug 682684.
   if (!mFrame) {
     return NS_ERROR_FAILURE;
   }
   mFrame->FinishedInitializer();
   return NS_OK;
 }

The Tor Browser / annotate

layout/forms/nsTextControlFrame.cpp@97036ab72558 (annotated)

layout/forms/nsTextControlFrame.cpp