mirror of
https://github.com/classilla/tenfourfox.git
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213 lines
7.5 KiB
C++
213 lines
7.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsMathMLTokenFrame.h"
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#include "nsPresContext.h"
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#include "nsContentUtils.h"
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#include "nsTextFrame.h"
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#include "RestyleManager.h"
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#include <algorithm>
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using namespace mozilla;
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nsIFrame*
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NS_NewMathMLTokenFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLTokenFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLTokenFrame)
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nsMathMLTokenFrame::~nsMathMLTokenFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::InheritAutomaticData(nsIFrame* aParent)
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{
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// let the base class get the default from our parent
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nsMathMLContainerFrame::InheritAutomaticData(aParent);
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return NS_OK;
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}
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eMathMLFrameType
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nsMathMLTokenFrame::GetMathMLFrameType()
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{
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// treat everything other than <mi> as ordinary...
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if (!mContent->IsMathMLElement(nsGkAtoms::mi_)) {
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return eMathMLFrameType_Ordinary;
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}
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uint8_t mathVariant = StyleFont()->mMathVariant;
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if ((mathVariant == NS_MATHML_MATHVARIANT_NONE &&
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(StyleFont()->mFont.style == NS_STYLE_FONT_STYLE_ITALIC ||
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HasAnyStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI))) ||
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mathVariant == NS_MATHML_MATHVARIANT_ITALIC ||
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mathVariant == NS_MATHML_MATHVARIANT_BOLD_ITALIC ||
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mathVariant == NS_MATHML_MATHVARIANT_SANS_SERIF_ITALIC ||
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mathVariant == NS_MATHML_MATHVARIANT_SANS_SERIF_BOLD_ITALIC) {
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return eMathMLFrameType_ItalicIdentifier;
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}
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return eMathMLFrameType_UprightIdentifier;
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}
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void
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nsMathMLTokenFrame::MarkTextFramesAsTokenMathML()
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{
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nsIFrame* child = nullptr;
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uint32_t childCount = 0;
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// Set flags on child text frames
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// - to force them to trim their leading and trailing whitespaces.
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// - Indicate which frames are suitable for mathvariant
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// - flag single character <mi> frames for special italic treatment
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for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
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childFrame = childFrame->GetNextSibling()) {
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for (nsIFrame* childFrame2 = childFrame->GetFirstPrincipalChild();
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childFrame2; childFrame2 = childFrame2->GetNextSibling()) {
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if (childFrame2->GetType() == nsGkAtoms::textFrame) {
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childFrame2->AddStateBits(TEXT_IS_IN_TOKEN_MATHML);
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child = childFrame2;
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childCount++;
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}
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}
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}
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if (mContent->IsMathMLElement(nsGkAtoms::mi_) && childCount == 1) {
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nsAutoString data;
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nsContentUtils::GetNodeTextContent(mContent, false, data);
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data.CompressWhitespace();
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int32_t length = data.Length();
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bool isSingleCharacter = length == 1 ||
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(length == 2 && NS_IS_HIGH_SURROGATE(data[0]));
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if (isSingleCharacter) {
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child->AddStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI);
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AddStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI);
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}
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}
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}
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void
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nsMathMLTokenFrame::SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList)
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{
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// First, let the base class do its work
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nsMathMLContainerFrame::SetInitialChildList(aListID, aChildList);
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MarkTextFramesAsTokenMathML();
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}
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void
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nsMathMLTokenFrame::AppendFrames(ChildListID aListID,
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nsFrameList& aChildList)
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{
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nsMathMLContainerFrame::AppendFrames(aListID, aChildList);
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MarkTextFramesAsTokenMathML();
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}
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void
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nsMathMLTokenFrame::InsertFrames(ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aChildList)
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{
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nsMathMLContainerFrame::InsertFrames(aListID, aPrevFrame, aChildList);
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MarkTextFramesAsTokenMathML();
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}
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void
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nsMathMLTokenFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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MarkInReflow();
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mPresentationData.flags &= ~NS_MATHML_ERROR;
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// initializations needed for empty markup like <mtag></mtag>
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aDesiredSize.ClearSize();
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aDesiredSize.SetBlockStartAscent(0);
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aDesiredSize.mBoundingMetrics = nsBoundingMetrics();
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nsIFrame* childFrame = GetFirstPrincipalChild();
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while (childFrame) {
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// ask our children to compute their bounding metrics
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nsHTMLReflowMetrics childDesiredSize(aReflowState.GetWritingMode(),
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aDesiredSize.mFlags
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| NS_REFLOW_CALC_BOUNDING_METRICS);
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WritingMode wm = childFrame->GetWritingMode();
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LogicalSize availSize = aReflowState.ComputedSize(wm);
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availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
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nsHTMLReflowState childReflowState(aPresContext, aReflowState,
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childFrame, availSize);
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ReflowChild(childFrame, aPresContext, childDesiredSize,
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childReflowState, aStatus);
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//NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
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SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
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childDesiredSize.mBoundingMetrics);
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childFrame = childFrame->GetNextSibling();
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}
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// place and size children
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FinalizeReflow(*aReflowState.rendContext, aDesiredSize);
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aStatus = NS_FRAME_COMPLETE;
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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}
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// For token elements, mBoundingMetrics is computed at the ReflowToken
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// pass, it is not computed here because our children may be text frames
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// that do not implement the GetBoundingMetrics() interface.
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/* virtual */ nsresult
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nsMathMLTokenFrame::Place(nsRenderingContext& aRenderingContext,
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bool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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mBoundingMetrics = nsBoundingMetrics();
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for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
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childFrame = childFrame->GetNextSibling()) {
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nsHTMLReflowMetrics childSize(aDesiredSize.GetWritingMode());
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GetReflowAndBoundingMetricsFor(childFrame, childSize,
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childSize.mBoundingMetrics, nullptr);
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// compute and cache the bounding metrics
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mBoundingMetrics += childSize.mBoundingMetrics;
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}
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RefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm),
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nsLayoutUtils::
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FontSizeInflationFor(this));
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nscoord ascent = fm->MaxAscent();
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nscoord descent = fm->MaxDescent();
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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aDesiredSize.Width() = mBoundingMetrics.width;
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aDesiredSize.SetBlockStartAscent(std::max(mBoundingMetrics.ascent, ascent));
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aDesiredSize.Height() = aDesiredSize.BlockStartAscent() +
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std::max(mBoundingMetrics.descent, descent);
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if (aPlaceOrigin) {
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nscoord dy, dx = 0;
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for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
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childFrame = childFrame->GetNextSibling()) {
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nsHTMLReflowMetrics childSize(aDesiredSize.GetWritingMode());
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GetReflowAndBoundingMetricsFor(childFrame, childSize,
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childSize.mBoundingMetrics);
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// place and size the child; (dx,0) makes the caret happy - bug 188146
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dy = childSize.Height() == 0 ? 0 : aDesiredSize.BlockStartAscent() - childSize.BlockStartAscent();
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FinishReflowChild(childFrame, PresContext(), childSize, nullptr, dx, dy, 0);
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dx += childSize.Width();
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}
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}
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SetReference(nsPoint(0, aDesiredSize.BlockStartAscent()));
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return NS_OK;
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}
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