1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/generic/nsBRFrame.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,261 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* rendering object for HTML <br> elements */
1.10 +
1.11 +#include "nsCOMPtr.h"
1.12 +#include "nsFrame.h"
1.13 +#include "nsPresContext.h"
1.14 +#include "nsLineLayout.h"
1.15 +#include "nsStyleConsts.h"
1.16 +#include "nsGkAtoms.h"
1.17 +#include "nsRenderingContext.h"
1.18 +#include "nsLayoutUtils.h"
1.19 +
1.20 +//FOR SELECTION
1.21 +#include "nsIContent.h"
1.22 +//END INCLUDES FOR SELECTION
1.23 +
1.24 +using namespace mozilla;
1.25 +
1.26 +class BRFrame : public nsFrame {
1.27 +public:
1.28 + NS_DECL_FRAMEARENA_HELPERS
1.29 +
1.30 + friend nsIFrame* NS_NewBRFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
1.31 +
1.32 + virtual ContentOffsets CalcContentOffsetsFromFramePoint(nsPoint aPoint) MOZ_OVERRIDE;
1.33 +
1.34 + virtual FrameSearchResult PeekOffsetNoAmount(bool aForward, int32_t* aOffset) MOZ_OVERRIDE;
1.35 + virtual FrameSearchResult PeekOffsetCharacter(bool aForward, int32_t* aOffset,
1.36 + bool aRespectClusters = true) MOZ_OVERRIDE;
1.37 + virtual FrameSearchResult PeekOffsetWord(bool aForward, bool aWordSelectEatSpace,
1.38 + bool aIsKeyboardSelect, int32_t* aOffset,
1.39 + PeekWordState* aState) MOZ_OVERRIDE;
1.40 +
1.41 + virtual nsresult Reflow(nsPresContext* aPresContext,
1.42 + nsHTMLReflowMetrics& aDesiredSize,
1.43 + const nsHTMLReflowState& aReflowState,
1.44 + nsReflowStatus& aStatus) MOZ_OVERRIDE;
1.45 + virtual void AddInlineMinWidth(nsRenderingContext *aRenderingContext,
1.46 + InlineMinWidthData *aData) MOZ_OVERRIDE;
1.47 + virtual void AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
1.48 + InlinePrefWidthData *aData) MOZ_OVERRIDE;
1.49 + virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
1.50 + virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
1.51 + virtual nsIAtom* GetType() const MOZ_OVERRIDE;
1.52 + virtual nscoord GetBaseline() const MOZ_OVERRIDE;
1.53 +
1.54 + virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
1.55 + {
1.56 + return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced |
1.57 + nsIFrame::eLineParticipant));
1.58 + }
1.59 +
1.60 +#ifdef ACCESSIBILITY
1.61 + virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
1.62 +#endif
1.63 +
1.64 +protected:
1.65 + BRFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
1.66 + virtual ~BRFrame();
1.67 +
1.68 + nscoord mAscent;
1.69 +};
1.70 +
1.71 +nsIFrame*
1.72 +NS_NewBRFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
1.73 +{
1.74 + return new (aPresShell) BRFrame(aContext);
1.75 +}
1.76 +
1.77 +NS_IMPL_FRAMEARENA_HELPERS(BRFrame)
1.78 +
1.79 +BRFrame::~BRFrame()
1.80 +{
1.81 +}
1.82 +
1.83 +nsresult
1.84 +BRFrame::Reflow(nsPresContext* aPresContext,
1.85 + nsHTMLReflowMetrics& aMetrics,
1.86 + const nsHTMLReflowState& aReflowState,
1.87 + nsReflowStatus& aStatus)
1.88 +{
1.89 + DO_GLOBAL_REFLOW_COUNT("BRFrame");
1.90 + DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
1.91 + aMetrics.Height() = 0; // BR frames with height 0 are ignored in quirks
1.92 + // mode by nsLineLayout::VerticalAlignFrames .
1.93 + // However, it's not always 0. See below.
1.94 + aMetrics.Width() = 0;
1.95 + aMetrics.SetTopAscent(0);
1.96 +
1.97 + // Only when the BR is operating in a line-layout situation will it
1.98 + // behave like a BR.
1.99 + nsLineLayout* ll = aReflowState.mLineLayout;
1.100 + if (ll) {
1.101 + // Note that the compatibility mode check excludes AlmostStandards
1.102 + // mode, since this is the inline box model. See bug 161691.
1.103 + if ( ll->LineIsEmpty() ||
1.104 + aPresContext->CompatibilityMode() == eCompatibility_FullStandards ) {
1.105 + // The line is logically empty; any whitespace is trimmed away.
1.106 + //
1.107 + // If this frame is going to terminate the line we know
1.108 + // that nothing else will go on the line. Therefore, in this
1.109 + // case, we provide some height for the BR frame so that it
1.110 + // creates some vertical whitespace. It's necessary to use the
1.111 + // line-height rather than the font size because the
1.112 + // quirks-mode fix that doesn't apply the block's min
1.113 + // line-height makes this necessary to make BR cause a line
1.114 + // of the full line-height
1.115 +
1.116 + // We also do this in strict mode because BR should act like a
1.117 + // normal inline frame. That line-height is used is important
1.118 + // here for cases where the line-height is less than 1.
1.119 + nsRefPtr<nsFontMetrics> fm;
1.120 + nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm),
1.121 + nsLayoutUtils::FontSizeInflationFor(this));
1.122 + aReflowState.rendContext->SetFont(fm); // FIXME: maybe not needed?
1.123 + if (fm) {
1.124 + nscoord logicalHeight = aReflowState.CalcLineHeight();
1.125 + aMetrics.Height() = logicalHeight;
1.126 + aMetrics.SetTopAscent(nsLayoutUtils::GetCenteredFontBaseline(fm, logicalHeight));
1.127 + }
1.128 + else {
1.129 + aMetrics.SetTopAscent(aMetrics.Height() = 0);
1.130 + }
1.131 +
1.132 + // XXX temporary until I figure out a better solution; see the
1.133 + // code in nsLineLayout::VerticalAlignFrames that zaps minY/maxY
1.134 + // if the width is zero.
1.135 + // XXX This also fixes bug 10036!
1.136 + // Warning: nsTextControlFrame::CalculateSizeStandard depends on
1.137 + // the following line, see bug 228752.
1.138 + aMetrics.Width() = 1;
1.139 + }
1.140 +
1.141 + // Return our reflow status
1.142 + uint32_t breakType = aReflowState.mStyleDisplay->mBreakType;
1.143 + if (NS_STYLE_CLEAR_NONE == breakType) {
1.144 + breakType = NS_STYLE_CLEAR_LINE;
1.145 + }
1.146 +
1.147 + aStatus = NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
1.148 + NS_INLINE_MAKE_BREAK_TYPE(breakType);
1.149 + ll->SetLineEndsInBR(true);
1.150 + }
1.151 + else {
1.152 + aStatus = NS_FRAME_COMPLETE;
1.153 + }
1.154 +
1.155 + aMetrics.SetOverflowAreasToDesiredBounds();
1.156 +
1.157 + mAscent = aMetrics.TopAscent();
1.158 +
1.159 + NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
1.160 + return NS_OK;
1.161 +}
1.162 +
1.163 +/* virtual */ void
1.164 +BRFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
1.165 + nsIFrame::InlineMinWidthData *aData)
1.166 +{
1.167 + aData->ForceBreak(aRenderingContext);
1.168 +}
1.169 +
1.170 +/* virtual */ void
1.171 +BRFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
1.172 + nsIFrame::InlinePrefWidthData *aData)
1.173 +{
1.174 + aData->ForceBreak(aRenderingContext);
1.175 +}
1.176 +
1.177 +/* virtual */ nscoord
1.178 +BRFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
1.179 +{
1.180 + nscoord result = 0;
1.181 + DISPLAY_MIN_WIDTH(this, result);
1.182 + return result;
1.183 +}
1.184 +
1.185 +/* virtual */ nscoord
1.186 +BRFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
1.187 +{
1.188 + nscoord result = 0;
1.189 + DISPLAY_PREF_WIDTH(this, result);
1.190 + return result;
1.191 +}
1.192 +
1.193 +nsIAtom*
1.194 +BRFrame::GetType() const
1.195 +{
1.196 + return nsGkAtoms::brFrame;
1.197 +}
1.198 +
1.199 +nscoord
1.200 +BRFrame::GetBaseline() const
1.201 +{
1.202 + return mAscent;
1.203 +}
1.204 +
1.205 +nsIFrame::ContentOffsets BRFrame::CalcContentOffsetsFromFramePoint(nsPoint aPoint)
1.206 +{
1.207 + ContentOffsets offsets;
1.208 + offsets.content = mContent->GetParent();
1.209 + if (offsets.content) {
1.210 + offsets.offset = offsets.content->IndexOf(mContent);
1.211 + offsets.secondaryOffset = offsets.offset;
1.212 + offsets.associateWithNext = true;
1.213 + }
1.214 + return offsets;
1.215 +}
1.216 +
1.217 +nsIFrame::FrameSearchResult
1.218 +BRFrame::PeekOffsetNoAmount(bool aForward, int32_t* aOffset)
1.219 +{
1.220 + NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
1.221 + int32_t startOffset = *aOffset;
1.222 + // If we hit the end of a BR going backwards, go to its beginning and stay there.
1.223 + if (!aForward && startOffset != 0) {
1.224 + *aOffset = 0;
1.225 + return FOUND;
1.226 + }
1.227 + // Otherwise, stop if we hit the beginning, continue (forward) if we hit the end.
1.228 + return (startOffset == 0) ? FOUND : CONTINUE;
1.229 +}
1.230 +
1.231 +nsIFrame::FrameSearchResult
1.232 +BRFrame::PeekOffsetCharacter(bool aForward, int32_t* aOffset,
1.233 + bool aRespectClusters)
1.234 +{
1.235 + NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
1.236 + // Keep going. The actual line jumping will stop us.
1.237 + return CONTINUE;
1.238 +}
1.239 +
1.240 +nsIFrame::FrameSearchResult
1.241 +BRFrame::PeekOffsetWord(bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
1.242 + int32_t* aOffset, PeekWordState* aState)
1.243 +{
1.244 + NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
1.245 + // Keep going. The actual line jumping will stop us.
1.246 + return CONTINUE;
1.247 +}
1.248 +
1.249 +#ifdef ACCESSIBILITY
1.250 +a11y::AccType
1.251 +BRFrame::AccessibleType()
1.252 +{
1.253 + nsIContent *parent = mContent->GetParent();
1.254 + if (parent && parent->IsRootOfNativeAnonymousSubtree() &&
1.255 + parent->GetChildCount() == 1) {
1.256 + // This <br> is the only node in a text control, therefore it is the hacky
1.257 + // "bogus node" used when there is no text in the control
1.258 + return a11y::eNoType;
1.259 + }
1.260 +
1.261 + return a11y::eHTMLBRType;
1.262 +}
1.263 +#endif
1.264 +
