The Tor Browser: layout/generic/nsBRFrame.cpp@b8a032363ba2 (annotated)

layout/generic/nsBRFrame.cpp@b8a032363ba2 (annotated)

layout/generic/nsBRFrame.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- 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/. */
 /* rendering object for HTML <br> elements */
 #include "nsCOMPtr.h"
 #include "nsFrame.h"
 #include "nsPresContext.h"
 #include "nsLineLayout.h"
 #include "nsStyleConsts.h"
 #include "nsGkAtoms.h"
 #include "nsRenderingContext.h"
 #include "nsLayoutUtils.h"
 //FOR SELECTION
 #include "nsIContent.h"
 //END INCLUDES FOR SELECTION
 using namespace mozilla;
 class BRFrame : public nsFrame {
 public:
   NS_DECL_FRAMEARENA_HELPERS
   friend nsIFrame* NS_NewBRFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
   virtual ContentOffsets CalcContentOffsetsFromFramePoint(nsPoint aPoint) MOZ_OVERRIDE;
   virtual FrameSearchResult PeekOffsetNoAmount(bool aForward, int32_t* aOffset) MOZ_OVERRIDE;
   virtual FrameSearchResult PeekOffsetCharacter(bool aForward, int32_t* aOffset,
                                      bool aRespectClusters = true) MOZ_OVERRIDE;
   virtual FrameSearchResult PeekOffsetWord(bool aForward, bool aWordSelectEatSpace,
                               bool aIsKeyboardSelect, int32_t* aOffset,
                               PeekWordState* aState) MOZ_OVERRIDE;
   virtual nsresult Reflow(nsPresContext* aPresContext,
                           nsHTMLReflowMetrics& aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus& aStatus) MOZ_OVERRIDE;
   virtual void AddInlineMinWidth(nsRenderingContext *aRenderingContext,
                                  InlineMinWidthData *aData) MOZ_OVERRIDE;
   virtual void AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
                                   InlinePrefWidthData *aData) MOZ_OVERRIDE;
   virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
   virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
   virtual nsIAtom* GetType() const MOZ_OVERRIDE;
   virtual nscoord GetBaseline() const MOZ_OVERRIDE;
   virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
   {
     return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced |
                                              nsIFrame::eLineParticipant));
   }
 #ifdef ACCESSIBILITY
   virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
 #endif
 protected:
   BRFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
   virtual ~BRFrame();
   nscoord mAscent;
 };
 nsIFrame*
 NS_NewBRFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   return new (aPresShell) BRFrame(aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(BRFrame)
 BRFrame::~BRFrame()
 {
 }
 nsresult
 BRFrame::Reflow(nsPresContext* aPresContext,
                 nsHTMLReflowMetrics& aMetrics,
                 const nsHTMLReflowState& aReflowState,
                 nsReflowStatus& aStatus)
 {
   DO_GLOBAL_REFLOW_COUNT("BRFrame");
   DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
   aMetrics.Height() = 0; // BR frames with height 0 are ignored in quirks
                        // mode by nsLineLayout::VerticalAlignFrames .
                        // However, it's not always 0.  See below.
   aMetrics.Width() = 0;
   aMetrics.SetTopAscent(0);
   // Only when the BR is operating in a line-layout situation will it
   // behave like a BR.
   nsLineLayout* ll = aReflowState.mLineLayout;
   if (ll) {
     // Note that the compatibility mode check excludes AlmostStandards
     // mode, since this is the inline box model.  See bug 161691.
     if ( ll->LineIsEmpty() ||
          aPresContext->CompatibilityMode() == eCompatibility_FullStandards ) {
       // The line is logically empty; any whitespace is trimmed away.
       //
       // If this frame is going to terminate the line we know
       // that nothing else will go on the line. Therefore, in this
       // case, we provide some height for the BR frame so that it
       // creates some vertical whitespace.  It's necessary to use the
       // line-height rather than the font size because the
       // quirks-mode fix that doesn't apply the block's min
       // line-height makes this necessary to make BR cause a line
       // of the full line-height
       // We also do this in strict mode because BR should act like a
       // normal inline frame.  That line-height is used is important
       // here for cases where the line-height is less than 1.
       nsRefPtr<nsFontMetrics> fm;
       nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm),
         nsLayoutUtils::FontSizeInflationFor(this));
       aReflowState.rendContext->SetFont(fm); // FIXME: maybe not needed?
       if (fm) {
         nscoord logicalHeight = aReflowState.CalcLineHeight();
         aMetrics.Height() = logicalHeight;
         aMetrics.SetTopAscent(nsLayoutUtils::GetCenteredFontBaseline(fm, logicalHeight));
       }
       else {
         aMetrics.SetTopAscent(aMetrics.Height() = 0);
       }
       // XXX temporary until I figure out a better solution; see the
       // code in nsLineLayout::VerticalAlignFrames that zaps minY/maxY
       // if the width is zero.
       // XXX This also fixes bug 10036!
       // Warning: nsTextControlFrame::CalculateSizeStandard depends on
       // the following line, see bug 228752.
       aMetrics.Width() = 1;
     }
     // Return our reflow status
     uint32_t breakType = aReflowState.mStyleDisplay->mBreakType;
     if (NS_STYLE_CLEAR_NONE == breakType) {
       breakType = NS_STYLE_CLEAR_LINE;
     }
     aStatus = NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
       NS_INLINE_MAKE_BREAK_TYPE(breakType);
     ll->SetLineEndsInBR(true);
   }
   else {
     aStatus = NS_FRAME_COMPLETE;
   }
   aMetrics.SetOverflowAreasToDesiredBounds();
   mAscent = aMetrics.TopAscent();
   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
   return NS_OK;
 }
 /* virtual */ void
 BRFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
                            nsIFrame::InlineMinWidthData *aData)
 {
   aData->ForceBreak(aRenderingContext);
 }
 /* virtual */ void
 BRFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
                             nsIFrame::InlinePrefWidthData *aData)
 {
   aData->ForceBreak(aRenderingContext);
 }
 /* virtual */ nscoord
 BRFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
 {
   nscoord result = 0;
   DISPLAY_MIN_WIDTH(this, result);
   return result;
 }
 /* virtual */ nscoord
 BRFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
 {
   nscoord result = 0;
   DISPLAY_PREF_WIDTH(this, result);
   return result;
 }
 nsIAtom*
 BRFrame::GetType() const
 {
   return nsGkAtoms::brFrame;
 }
 nscoord
 BRFrame::GetBaseline() const
 {
   return mAscent;
 }
 nsIFrame::ContentOffsets BRFrame::CalcContentOffsetsFromFramePoint(nsPoint aPoint)
 {
   ContentOffsets offsets;
   offsets.content = mContent->GetParent();
   if (offsets.content) {
     offsets.offset = offsets.content->IndexOf(mContent);
     offsets.secondaryOffset = offsets.offset;
     offsets.associateWithNext = true;
   }
   return offsets;
 }
 nsIFrame::FrameSearchResult
 BRFrame::PeekOffsetNoAmount(bool aForward, int32_t* aOffset)
 {
   NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
   int32_t startOffset = *aOffset;
   // If we hit the end of a BR going backwards, go to its beginning and stay there.
   if (!aForward && startOffset != 0) {
     *aOffset = 0;
     return FOUND;
   }
   // Otherwise, stop if we hit the beginning, continue (forward) if we hit the end.
   return (startOffset == 0) ? FOUND : CONTINUE;
 }
 nsIFrame::FrameSearchResult
 BRFrame::PeekOffsetCharacter(bool aForward, int32_t* aOffset,
                              bool aRespectClusters)
 {
   NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
   // Keep going. The actual line jumping will stop us.
   return CONTINUE;
 }
 nsIFrame::FrameSearchResult
 BRFrame::PeekOffsetWord(bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
                         int32_t* aOffset, PeekWordState* aState)
 {
   NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
   // Keep going. The actual line jumping will stop us.
   return CONTINUE;
 }
 #ifdef ACCESSIBILITY
 a11y::AccType
 BRFrame::AccessibleType()
 {
   nsIContent *parent = mContent->GetParent();
   if (parent && parent->IsRootOfNativeAnonymousSubtree() &&
       parent->GetChildCount() == 1) {
     // This <br> is the only node in a text control, therefore it is the hacky
     // "bogus node" used when there is no text in the control
     return a11y::eNoType;
   }
   return a11y::eHTMLBRType;
 }
 #endif

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layout/generic/nsBRFrame.cpp@b8a032363ba2 (annotated)

layout/generic/nsBRFrame.cpp