1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/mathml/nsMathMLTokenFrame.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,231 @@
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 +#include "nsMathMLTokenFrame.h"
1.10 +#include "nsPresContext.h"
1.11 +#include "nsContentUtils.h"
1.12 +#include "nsTextFrame.h"
1.13 +#include "RestyleManager.h"
1.14 +#include <algorithm>
1.15 +
1.16 +nsIFrame*
1.17 +NS_NewMathMLTokenFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
1.18 +{
1.19 + return new (aPresShell) nsMathMLTokenFrame(aContext);
1.20 +}
1.21 +
1.22 +NS_IMPL_FRAMEARENA_HELPERS(nsMathMLTokenFrame)
1.23 +
1.24 +nsMathMLTokenFrame::~nsMathMLTokenFrame()
1.25 +{
1.26 +}
1.27 +
1.28 +NS_IMETHODIMP
1.29 +nsMathMLTokenFrame::InheritAutomaticData(nsIFrame* aParent)
1.30 +{
1.31 + // let the base class get the default from our parent
1.32 + nsMathMLContainerFrame::InheritAutomaticData(aParent);
1.33 +
1.34 + return NS_OK;
1.35 +}
1.36 +
1.37 +eMathMLFrameType
1.38 +nsMathMLTokenFrame::GetMathMLFrameType()
1.39 +{
1.40 + // treat everything other than <mi> as ordinary...
1.41 + if (mContent->Tag() != nsGkAtoms::mi_) {
1.42 + return eMathMLFrameType_Ordinary;
1.43 + }
1.44 +
1.45 + uint8_t mathVariant = StyleFont()->mMathVariant;
1.46 + if ((mathVariant == NS_MATHML_MATHVARIANT_NONE &&
1.47 + (StyleFont()->mFont.style == NS_STYLE_FONT_STYLE_ITALIC ||
1.48 + HasAnyStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI))) ||
1.49 + mathVariant == NS_MATHML_MATHVARIANT_ITALIC ||
1.50 + mathVariant == NS_MATHML_MATHVARIANT_BOLD_ITALIC ||
1.51 + mathVariant == NS_MATHML_MATHVARIANT_SANS_SERIF_ITALIC ||
1.52 + mathVariant == NS_MATHML_MATHVARIANT_SANS_SERIF_BOLD_ITALIC) {
1.53 + return eMathMLFrameType_ItalicIdentifier;
1.54 + }
1.55 + return eMathMLFrameType_UprightIdentifier;
1.56 +}
1.57 +
1.58 +void
1.59 +nsMathMLTokenFrame::MarkTextFramesAsTokenMathML()
1.60 +{
1.61 + nsIFrame* child = nullptr;
1.62 + uint32_t childCount = 0;
1.63 +
1.64 + // Set flags on child text frames
1.65 + // - to force them to trim their leading and trailing whitespaces.
1.66 + // - Indicate which frames are suitable for mathvariant
1.67 + // - flag single character <mi> frames for special italic treatment
1.68 + for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
1.69 + childFrame = childFrame->GetNextSibling()) {
1.70 + for (nsIFrame* childFrame2 = childFrame->GetFirstPrincipalChild();
1.71 + childFrame2; childFrame2 = childFrame2->GetNextSibling()) {
1.72 + if (childFrame2->GetType() == nsGkAtoms::textFrame) {
1.73 + childFrame2->AddStateBits(TEXT_IS_IN_TOKEN_MATHML);
1.74 + child = childFrame2;
1.75 + childCount++;
1.76 + }
1.77 + }
1.78 + }
1.79 + if (mContent->Tag() == nsGkAtoms::mi_ && childCount == 1) {
1.80 + nsAutoString data;
1.81 + if (!nsContentUtils::GetNodeTextContent(mContent, false, data)) {
1.82 + NS_RUNTIMEABORT("OOM");
1.83 + }
1.84 +
1.85 + data.CompressWhitespace();
1.86 + int32_t length = data.Length();
1.87 +
1.88 + bool isSingleCharacter = length == 1 ||
1.89 + (length == 2 && NS_IS_HIGH_SURROGATE(data[0]));
1.90 +
1.91 + if (isSingleCharacter) {
1.92 + child->AddStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI);
1.93 + AddStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI);
1.94 + }
1.95 + }
1.96 +}
1.97 +
1.98 +nsresult
1.99 +nsMathMLTokenFrame::SetInitialChildList(ChildListID aListID,
1.100 + nsFrameList& aChildList)
1.101 +{
1.102 + // First, let the base class do its work
1.103 + nsresult rv = nsMathMLContainerFrame::SetInitialChildList(aListID, aChildList);
1.104 + if (NS_FAILED(rv))
1.105 + return rv;
1.106 +
1.107 + MarkTextFramesAsTokenMathML();
1.108 +
1.109 + return rv;
1.110 +}
1.111 +
1.112 +nsresult
1.113 +nsMathMLTokenFrame::AppendFrames(ChildListID aListID,
1.114 + nsFrameList& aChildList)
1.115 +{
1.116 + nsresult rv = nsMathMLContainerFrame::AppendFrames(aListID, aChildList);
1.117 + if (NS_FAILED(rv))
1.118 + return rv;
1.119 +
1.120 + MarkTextFramesAsTokenMathML();
1.121 +
1.122 + return rv;
1.123 +}
1.124 +
1.125 +nsresult
1.126 +nsMathMLTokenFrame::InsertFrames(ChildListID aListID,
1.127 + nsIFrame* aPrevFrame,
1.128 + nsFrameList& aChildList)
1.129 +{
1.130 + nsresult rv = nsMathMLContainerFrame::InsertFrames(aListID, aPrevFrame,
1.131 + aChildList);
1.132 + if (NS_FAILED(rv))
1.133 + return rv;
1.134 +
1.135 + MarkTextFramesAsTokenMathML();
1.136 +
1.137 + return rv;
1.138 +}
1.139 +
1.140 +nsresult
1.141 +nsMathMLTokenFrame::Reflow(nsPresContext* aPresContext,
1.142 + nsHTMLReflowMetrics& aDesiredSize,
1.143 + const nsHTMLReflowState& aReflowState,
1.144 + nsReflowStatus& aStatus)
1.145 +{
1.146 + nsresult rv = NS_OK;
1.147 +
1.148 + // initializations needed for empty markup like <mtag></mtag>
1.149 + aDesiredSize.Width() = aDesiredSize.Height() = 0;
1.150 + aDesiredSize.SetTopAscent(0);
1.151 + aDesiredSize.mBoundingMetrics = nsBoundingMetrics();
1.152 +
1.153 + nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
1.154 + nsIFrame* childFrame = GetFirstPrincipalChild();
1.155 + while (childFrame) {
1.156 + // ask our children to compute their bounding metrics
1.157 + nsHTMLReflowMetrics childDesiredSize(aReflowState.GetWritingMode(),
1.158 + aDesiredSize.mFlags
1.159 + | NS_REFLOW_CALC_BOUNDING_METRICS);
1.160 + nsHTMLReflowState childReflowState(aPresContext, aReflowState,
1.161 + childFrame, availSize);
1.162 + rv = ReflowChild(childFrame, aPresContext, childDesiredSize,
1.163 + childReflowState, aStatus);
1.164 + //NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
1.165 + if (NS_FAILED(rv)) {
1.166 + // Call DidReflow() for the child frames we successfully did reflow.
1.167 + DidReflowChildren(GetFirstPrincipalChild(), childFrame);
1.168 + return rv;
1.169 + }
1.170 +
1.171 + SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
1.172 + childDesiredSize.mBoundingMetrics);
1.173 +
1.174 + childFrame = childFrame->GetNextSibling();
1.175 + }
1.176 +
1.177 +
1.178 + // place and size children
1.179 + FinalizeReflow(*aReflowState.rendContext, aDesiredSize);
1.180 +
1.181 + aStatus = NS_FRAME_COMPLETE;
1.182 + NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
1.183 + return NS_OK;
1.184 +}
1.185 +
1.186 +// For token elements, mBoundingMetrics is computed at the ReflowToken
1.187 +// pass, it is not computed here because our children may be text frames
1.188 +// that do not implement the GetBoundingMetrics() interface.
1.189 +/* virtual */ nsresult
1.190 +nsMathMLTokenFrame::Place(nsRenderingContext& aRenderingContext,
1.191 + bool aPlaceOrigin,
1.192 + nsHTMLReflowMetrics& aDesiredSize)
1.193 +{
1.194 + mBoundingMetrics = nsBoundingMetrics();
1.195 + for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
1.196 + childFrame = childFrame->GetNextSibling()) {
1.197 + nsHTMLReflowMetrics childSize(aDesiredSize.GetWritingMode());
1.198 + GetReflowAndBoundingMetricsFor(childFrame, childSize,
1.199 + childSize.mBoundingMetrics, nullptr);
1.200 + // compute and cache the bounding metrics
1.201 + mBoundingMetrics += childSize.mBoundingMetrics;
1.202 + }
1.203 +
1.204 + nsRefPtr<nsFontMetrics> fm;
1.205 + nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
1.206 + nscoord ascent = fm->MaxAscent();
1.207 + nscoord descent = fm->MaxDescent();
1.208 +
1.209 + aDesiredSize.mBoundingMetrics = mBoundingMetrics;
1.210 + aDesiredSize.Width() = mBoundingMetrics.width;
1.211 + aDesiredSize.SetTopAscent(std::max(mBoundingMetrics.ascent, ascent));
1.212 + aDesiredSize.Height() = aDesiredSize.TopAscent() +
1.213 + std::max(mBoundingMetrics.descent, descent);
1.214 +
1.215 + if (aPlaceOrigin) {
1.216 + nscoord dy, dx = 0;
1.217 + for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
1.218 + childFrame = childFrame->GetNextSibling()) {
1.219 + nsHTMLReflowMetrics childSize(aDesiredSize.GetWritingMode());
1.220 + GetReflowAndBoundingMetricsFor(childFrame, childSize,
1.221 + childSize.mBoundingMetrics);
1.222 +
1.223 + // place and size the child; (dx,0) makes the caret happy - bug 188146
1.224 + dy = childSize.Height() == 0 ? 0 : aDesiredSize.TopAscent() - childSize.TopAscent();
1.225 + FinishReflowChild(childFrame, PresContext(), childSize, nullptr, dx, dy, 0);
1.226 + dx += childSize.Width();
1.227 + }
1.228 + }
1.229 +
1.230 + SetReference(nsPoint(0, aDesiredSize.TopAscent()));
1.231 +
1.232 + return NS_OK;
1.233 +}
1.234 +
