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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /layout/generic/nsBRFrame.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'layout/generic/nsBRFrame.cpp')
-rw-r--r--layout/generic/nsBRFrame.cpp282
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diff --git a/layout/generic/nsBRFrame.cpp b/layout/generic/nsBRFrame.cpp
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+/* -*- 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 "nsFontMetrics.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) override;
+
+ virtual FrameSearchResult PeekOffsetNoAmount(bool aForward, int32_t* aOffset) override;
+ virtual FrameSearchResult PeekOffsetCharacter(bool aForward, int32_t* aOffset,
+ bool aRespectClusters = true) override;
+ virtual FrameSearchResult PeekOffsetWord(bool aForward, bool aWordSelectEatSpace,
+ bool aIsKeyboardSelect, int32_t* aOffset,
+ PeekWordState* aState) override;
+
+ virtual void Reflow(nsPresContext* aPresContext,
+ ReflowOutput& aDesiredSize,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus) override;
+ virtual void AddInlineMinISize(nsRenderingContext *aRenderingContext,
+ InlineMinISizeData *aData) override;
+ virtual void AddInlinePrefISize(nsRenderingContext *aRenderingContext,
+ InlinePrefISizeData *aData) override;
+ virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
+ virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
+ virtual nsIAtom* GetType() const override;
+ virtual nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const override;
+
+ virtual bool IsFrameOfType(uint32_t aFlags) const override
+ {
+ return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced |
+ nsIFrame::eLineParticipant));
+ }
+
+#ifdef ACCESSIBILITY
+ virtual mozilla::a11y::AccType AccessibleType() override;
+#endif
+
+protected:
+ explicit 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()
+{
+}
+
+void
+BRFrame::Reflow(nsPresContext* aPresContext,
+ ReflowOutput& aMetrics,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus)
+{
+ MarkInReflow();
+ DO_GLOBAL_REFLOW_COUNT("BRFrame");
+ DISPLAY_REFLOW(aPresContext, this, aReflowInput, aMetrics, aStatus);
+ WritingMode wm = aReflowInput.GetWritingMode();
+ LogicalSize finalSize(wm);
+ finalSize.BSize(wm) = 0; // BR frames with block size 0 are ignored in quirks
+ // mode by nsLineLayout::VerticalAlignFrames .
+ // However, it's not always 0. See below.
+ finalSize.ISize(wm) = 0;
+ aMetrics.SetBlockStartAscent(0);
+
+ // Only when the BR is operating in a line-layout situation will it
+ // behave like a BR. Additionally, we suppress breaks from BR inside
+ // of ruby frames. To determine if we're inside ruby, we have to rely
+ // on the *parent's* ShouldSuppressLineBreak() method, instead of our
+ // own, because we may have custom "display" value that makes our
+ // ShouldSuppressLineBreak() return false.
+ nsLineLayout* ll = aReflowInput.mLineLayout;
+ if (ll && !GetParent()->StyleContext()->ShouldSuppressLineBreak()) {
+ // 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.
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetInflatedFontMetricsForFrame(this);
+ if (fm) {
+ nscoord logicalHeight = aReflowInput.CalcLineHeight();
+ finalSize.BSize(wm) = logicalHeight;
+ aMetrics.SetBlockStartAscent(nsLayoutUtils::GetCenteredFontBaseline(
+ fm, logicalHeight, wm.IsLineInverted()));
+ }
+ else {
+ aMetrics.SetBlockStartAscent(aMetrics.BSize(wm) = 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.
+ // The code below in AddInlinePrefISize also adds 1 appunit to width
+ finalSize.ISize(wm) = 1;
+ }
+
+ // Return our reflow status
+ StyleClear breakType = aReflowInput.mStyleDisplay->PhysicalBreakType(wm);
+ if (StyleClear::None == breakType) {
+ breakType = StyleClear::Line;
+ }
+
+ aStatus = NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
+ NS_INLINE_MAKE_BREAK_TYPE(breakType);
+ ll->SetLineEndsInBR(true);
+ }
+ else {
+ aStatus = NS_FRAME_COMPLETE;
+ }
+
+ aMetrics.SetSize(wm, finalSize);
+ aMetrics.SetOverflowAreasToDesiredBounds();
+
+ mAscent = aMetrics.BlockStartAscent();
+
+ NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aMetrics);
+}
+
+/* virtual */ void
+BRFrame::AddInlineMinISize(nsRenderingContext *aRenderingContext,
+ nsIFrame::InlineMinISizeData *aData)
+{
+ if (!GetParent()->StyleContext()->ShouldSuppressLineBreak()) {
+ aData->ForceBreak();
+ }
+}
+
+/* virtual */ void
+BRFrame::AddInlinePrefISize(nsRenderingContext *aRenderingContext,
+ nsIFrame::InlinePrefISizeData *aData)
+{
+ if (!GetParent()->StyleContext()->ShouldSuppressLineBreak()) {
+ // Match the 1 appunit width assigned in the Reflow method above
+ aData->mCurrentLine += 1;
+ aData->ForceBreak();
+ }
+}
+
+/* virtual */ nscoord
+BRFrame::GetMinISize(nsRenderingContext *aRenderingContext)
+{
+ nscoord result = 0;
+ DISPLAY_MIN_WIDTH(this, result);
+ return result;
+}
+
+/* virtual */ nscoord
+BRFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
+{
+ nscoord result = 0;
+ DISPLAY_PREF_WIDTH(this, result);
+ return result;
+}
+
+nsIAtom*
+BRFrame::GetType() const
+{
+ return nsGkAtoms::brFrame;
+}
+
+nscoord
+BRFrame::GetLogicalBaseline(mozilla::WritingMode aWritingMode) 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.associate = CARET_ASSOCIATE_AFTER;
+ }
+ 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;
+ }
+
+ // Trailing HTML br element don't play any difference. We don't need to expose
+ // it to AT (see bug https://bugzilla.mozilla.org/show_bug.cgi?id=899433#c16
+ // for details).
+ if (!mContent->GetNextSibling() && !GetNextSibling()) {
+ return a11y::eNoType;
+ }
+
+ return a11y::eHTMLBRType;
+}
+#endif
+