mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
0354744354
This moves restyling management out of nsCSSFrameConstructor (thus reducing its size), and keeps the restyling code closer together. This is the first of two big chunks of code moved in this patch series. A later patch in this series will move related code from nsFrameManager into the same destination file.
353 lines
12 KiB
C++
353 lines
12 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 "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsContentUtils.h"
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#include "nsCSSFrameConstructor.h"
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#include "nsMathMLTokenFrame.h"
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#include "nsTextFrame.h"
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#include <algorithm>
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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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ProcessTextData();
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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->Tag() != nsGkAtoms::mi_) {
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return eMathMLFrameType_Ordinary;
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}
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// for <mi>, distinguish between italic and upright...
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nsAutoString style;
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// mathvariant overrides fontstyle
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// http://www.w3.org/TR/2003/REC-MathML2-20031021/chapter3.html#presm.deprecatt
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mContent->GetAttr(kNameSpaceID_None,
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nsGkAtoms::_moz_math_fontstyle_, style) ||
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GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::mathvariant_,
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style) ||
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GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::fontstyle_,
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style);
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if (style.EqualsLiteral("italic") || style.EqualsLiteral("bold-italic") ||
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style.EqualsLiteral("script") || style.EqualsLiteral("bold-script") ||
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style.EqualsLiteral("sans-serif-italic") ||
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style.EqualsLiteral("sans-serif-bold-italic")) {
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return eMathMLFrameType_ItalicIdentifier;
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}
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else if(style.EqualsLiteral("invariant")) {
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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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eMATHVARIANT variant = nsMathMLOperators::LookupInvariantChar(data);
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switch (variant) {
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case eMATHVARIANT_italic:
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case eMATHVARIANT_bold_italic:
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case eMATHVARIANT_script:
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case eMATHVARIANT_bold_script:
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case eMATHVARIANT_sans_serif_italic:
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case eMATHVARIANT_sans_serif_bold_italic:
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return eMathMLFrameType_ItalicIdentifier;
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default:
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; // fall through to upright
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}
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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::ForceTrimChildTextFrames()
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{
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// Set flags on child text frames to force them to trim their leading and
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// trailing whitespaces.
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for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
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childFrame = childFrame->GetNextSibling()) {
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if (childFrame->GetType() == nsGkAtoms::textFrame) {
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childFrame->AddStateBits(TEXT_FORCE_TRIM_WHITESPACE);
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}
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}
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}
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NS_IMETHODIMP
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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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nsresult rv = nsMathMLContainerFrame::SetInitialChildList(aListID, aChildList);
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if (NS_FAILED(rv))
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return rv;
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ForceTrimChildTextFrames();
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ProcessTextData();
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return rv;
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::AppendFrames(ChildListID aListID,
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nsFrameList& aChildList)
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{
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nsresult rv = nsMathMLContainerFrame::AppendFrames(aListID, aChildList);
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if (NS_FAILED(rv))
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return rv;
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ForceTrimChildTextFrames();
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return rv;
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}
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NS_IMETHODIMP
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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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nsresult rv = nsMathMLContainerFrame::InsertFrames(aListID, aPrevFrame,
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aChildList);
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if (NS_FAILED(rv))
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return rv;
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ForceTrimChildTextFrames();
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return rv;
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}
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nsresult
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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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nsresult rv = NS_OK;
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// initializations needed for empty markup like <mtag></mtag>
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aDesiredSize.width = aDesiredSize.height = 0;
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aDesiredSize.ascent = 0;
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aDesiredSize.mBoundingMetrics = nsBoundingMetrics();
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nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
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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(aDesiredSize.mFlags
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| NS_REFLOW_CALC_BOUNDING_METRICS);
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nsHTMLReflowState childReflowState(aPresContext, aReflowState,
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childFrame, availSize);
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rv = 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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if (NS_FAILED(rv)) {
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// Call DidReflow() for the child frames we successfully did reflow.
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DidReflowChildren(GetFirstPrincipalChild(), childFrame);
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return rv;
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}
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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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return NS_OK;
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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;
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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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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
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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.ascent = std::max(mBoundingMetrics.ascent, ascent);
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aDesiredSize.height = aDesiredSize.ascent +
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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;
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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.ascent - childSize.ascent;
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FinishReflowChild(childFrame, PresContext(), nullptr, childSize, 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.ascent));
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return NS_OK;
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}
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/* virtual */ void
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nsMathMLTokenFrame::MarkIntrinsicWidthsDirty()
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{
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// this could be called due to changes in the nsTextFrame beneath us
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// when something changed in the text content. So re-process our text
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ProcessTextData();
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nsMathMLContainerFrame::MarkIntrinsicWidthsDirty();
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}
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void
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nsMathMLTokenFrame::ProcessTextData()
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{
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// see if the style changes from normal to italic or vice-versa
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if (!SetTextStyle())
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return;
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// explicitly request a re-resolve to pick up the change of style
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PresContext()->RestyleManager()->
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PostRestyleEvent(mContent->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE);
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}
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///////////////////////////////////////////////////////////////////////////
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// For <mi>, if the content is not a single character, turn the font to
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// normal (this function will also query attributes from the mstyle hierarchy)
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// Returns true if there is a style change.
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//
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// http://www.w3.org/TR/2003/REC-MathML2-20031021/chapter3.html#presm.commatt
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//
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// "It is important to note that only certain combinations of
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// character data and mathvariant attribute values make sense.
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// ...
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// By design, the only cases that have an unambiguous
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// interpretation are exactly the ones that correspond to SMP Math
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// Alphanumeric Symbol characters, which are enumerated in Section
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// 6.2.3 Mathematical Alphanumeric Symbols Characters. In all other
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// cases, it is suggested that renderers ignore the value of the
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// mathvariant attribute if it is present."
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//
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// There are no corresponding characters for mathvariant=normal, suggesting
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// that this value should be ignored, but this (from the same section of
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// Chapter 3) implies that font-style should not be inherited, but set to
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// normal for mathvariant=normal:
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//
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// "In particular, inheritance of the mathvariant attribute does not follow
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// the CSS model. The default value for this attribute is "normal"
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// (non-slanted) for all tokens except mi. ... (The deprecated fontslant
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// attribute also behaves this way.)"
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bool
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nsMathMLTokenFrame::SetTextStyle()
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{
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if (mContent->Tag() != nsGkAtoms::mi_)
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return false;
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if (!mFrames.FirstChild())
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return false;
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// Get the text content that we enclose and its length
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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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if (!length)
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return false;
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nsAutoString fontstyle;
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bool isSingleCharacter =
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length == 1 ||
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(length == 2 && NS_IS_HIGH_SURROGATE(data[0]));
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if (isSingleCharacter &&
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nsMathMLOperators::LookupInvariantChar(data) != eMATHVARIANT_NONE) {
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// bug 65951 - a non-stylable character has its own intrinsic appearance
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fontstyle.AssignLiteral("invariant");
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}
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else {
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// Attributes override the default behavior.
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nsAutoString value;
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if (!(GetAttribute(mContent, mPresentationData.mstyle,
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nsGkAtoms::mathvariant_, value) ||
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GetAttribute(mContent, mPresentationData.mstyle,
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nsGkAtoms::fontstyle_, value))) {
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if (!isSingleCharacter) {
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fontstyle.AssignLiteral("normal");
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}
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else if (length == 1 && // BMP
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!nsMathMLOperators::
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TransformVariantChar(data[0], eMATHVARIANT_italic).
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Equals(data)) {
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// Transformation exists. Try to make the BMP character look like the
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// styled character using the style system until bug 114365 is resolved.
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fontstyle.AssignLiteral("italic");
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}
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// else single character but there is no corresponding Math Alphanumeric
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// Symbol character: "ignore the value of the [default] mathvariant
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// attribute".
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}
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}
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// set the _moz-math-font-style attribute without notifying that we want a reflow
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if (fontstyle.IsEmpty()) {
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if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::_moz_math_fontstyle_)) {
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mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_moz_math_fontstyle_,
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false);
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return true;
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}
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}
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else if (!mContent->AttrValueIs(kNameSpaceID_None,
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nsGkAtoms::_moz_math_fontstyle_,
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fontstyle, eCaseMatters)) {
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mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::_moz_math_fontstyle_,
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fontstyle, false);
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return true;
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}
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return false;
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}
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