diff options
Diffstat (limited to 'layout/mathml/nsMathMLTokenFrame.cpp')
| -rw-r--r-- | layout/mathml/nsMathMLTokenFrame.cpp | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLTokenFrame.cpp b/layout/mathml/nsMathMLTokenFrame.cpp new file mode 100644 index 0000000000..7558664f21 --- /dev/null +++ b/layout/mathml/nsMathMLTokenFrame.cpp @@ -0,0 +1,205 @@ +/* -*- 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/. */ + +#include "nsMathMLTokenFrame.h" +#include "nsPresContext.h" +#include "nsContentUtils.h" +#include "nsTextFrame.h" +#include "mozilla/RestyleManager.h" +#include <algorithm> + +using namespace mozilla; + +nsIFrame* +NS_NewMathMLTokenFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) +{ + return new (aPresShell) nsMathMLTokenFrame(aContext); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsMathMLTokenFrame) + +nsMathMLTokenFrame::~nsMathMLTokenFrame() +{ +} + +NS_IMETHODIMP +nsMathMLTokenFrame::InheritAutomaticData(nsIFrame* aParent) +{ + // let the base class get the default from our parent + nsMathMLContainerFrame::InheritAutomaticData(aParent); + + return NS_OK; +} + +eMathMLFrameType +nsMathMLTokenFrame::GetMathMLFrameType() +{ + // treat everything other than <mi> as ordinary... + if (!mContent->IsMathMLElement(nsGkAtoms::mi_)) { + return eMathMLFrameType_Ordinary; + } + + uint8_t mathVariant = StyleFont()->mMathVariant; + if ((mathVariant == NS_MATHML_MATHVARIANT_NONE && + (StyleFont()->mFont.style == NS_STYLE_FONT_STYLE_ITALIC || + HasAnyStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI))) || + mathVariant == NS_MATHML_MATHVARIANT_ITALIC || + mathVariant == NS_MATHML_MATHVARIANT_BOLD_ITALIC || + mathVariant == NS_MATHML_MATHVARIANT_SANS_SERIF_ITALIC || + mathVariant == NS_MATHML_MATHVARIANT_SANS_SERIF_BOLD_ITALIC) { + return eMathMLFrameType_ItalicIdentifier; + } + return eMathMLFrameType_UprightIdentifier; +} + +void +nsMathMLTokenFrame::MarkTextFramesAsTokenMathML() +{ + nsIFrame* child = nullptr; + uint32_t childCount = 0; + + // Set flags on child text frames + // - to force them to trim their leading and trailing whitespaces. + // - Indicate which frames are suitable for mathvariant + // - flag single character <mi> frames for special italic treatment + for (nsIFrame* childFrame = PrincipalChildList().FirstChild(); childFrame; + childFrame = childFrame->GetNextSibling()) { + for (nsIFrame* childFrame2 = childFrame->PrincipalChildList().FirstChild(); + childFrame2; childFrame2 = childFrame2->GetNextSibling()) { + if (childFrame2->GetType() == nsGkAtoms::textFrame) { + childFrame2->AddStateBits(TEXT_IS_IN_TOKEN_MATHML); + child = childFrame2; + childCount++; + } + } + } + if (mContent->IsMathMLElement(nsGkAtoms::mi_) && childCount == 1) { + nsAutoString data; + nsContentUtils::GetNodeTextContent(mContent, false, data); + + data.CompressWhitespace(); + int32_t length = data.Length(); + + bool isSingleCharacter = length == 1 || + (length == 2 && NS_IS_HIGH_SURROGATE(data[0])); + + if (isSingleCharacter) { + child->AddStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI); + AddStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI); + } + } +} + +void +nsMathMLTokenFrame::SetInitialChildList(ChildListID aListID, + nsFrameList& aChildList) +{ + // First, let the base class do its work + nsMathMLContainerFrame::SetInitialChildList(aListID, aChildList); + MarkTextFramesAsTokenMathML(); +} + +void +nsMathMLTokenFrame::AppendFrames(ChildListID aListID, + nsFrameList& aChildList) +{ + nsMathMLContainerFrame::AppendFrames(aListID, aChildList); + MarkTextFramesAsTokenMathML(); +} + +void +nsMathMLTokenFrame::InsertFrames(ChildListID aListID, + nsIFrame* aPrevFrame, + nsFrameList& aChildList) +{ + nsMathMLContainerFrame::InsertFrames(aListID, aPrevFrame, aChildList); + MarkTextFramesAsTokenMathML(); +} + +void +nsMathMLTokenFrame::Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) +{ + MarkInReflow(); + mPresentationData.flags &= ~NS_MATHML_ERROR; + + // initializations needed for empty markup like <mtag></mtag> + aDesiredSize.ClearSize(); + aDesiredSize.SetBlockStartAscent(0); + aDesiredSize.mBoundingMetrics = nsBoundingMetrics(); + + for (nsIFrame* childFrame : PrincipalChildList()) { + // ask our children to compute their bounding metrics + ReflowOutput childDesiredSize(aReflowInput.GetWritingMode(), + aDesiredSize.mFlags + | NS_REFLOW_CALC_BOUNDING_METRICS); + WritingMode wm = childFrame->GetWritingMode(); + LogicalSize availSize = aReflowInput.ComputedSize(wm); + availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE; + ReflowInput childReflowInput(aPresContext, aReflowInput, + childFrame, availSize); + ReflowChild(childFrame, aPresContext, childDesiredSize, + childReflowInput, aStatus); + //NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status"); + SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize, + childDesiredSize.mBoundingMetrics); + } + + // place and size children + FinalizeReflow(aReflowInput.mRenderingContext->GetDrawTarget(), aDesiredSize); + + aStatus = NS_FRAME_COMPLETE; + NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize); +} + +// For token elements, mBoundingMetrics is computed at the ReflowToken +// pass, it is not computed here because our children may be text frames +// that do not implement the GetBoundingMetrics() interface. +/* virtual */ nsresult +nsMathMLTokenFrame::Place(DrawTarget* aDrawTarget, + bool aPlaceOrigin, + ReflowOutput& aDesiredSize) +{ + mBoundingMetrics = nsBoundingMetrics(); + for (nsIFrame* childFrame :PrincipalChildList()) { + ReflowOutput childSize(aDesiredSize.GetWritingMode()); + GetReflowAndBoundingMetricsFor(childFrame, childSize, + childSize.mBoundingMetrics, nullptr); + // compute and cache the bounding metrics + mBoundingMetrics += childSize.mBoundingMetrics; + } + + RefPtr<nsFontMetrics> fm = + nsLayoutUtils::GetInflatedFontMetricsForFrame(this); + nscoord ascent = fm->MaxAscent(); + nscoord descent = fm->MaxDescent(); + + aDesiredSize.mBoundingMetrics = mBoundingMetrics; + aDesiredSize.Width() = mBoundingMetrics.width; + aDesiredSize.SetBlockStartAscent(std::max(mBoundingMetrics.ascent, ascent)); + aDesiredSize.Height() = aDesiredSize.BlockStartAscent() + + std::max(mBoundingMetrics.descent, descent); + + if (aPlaceOrigin) { + nscoord dy, dx = 0; + for (nsIFrame* childFrame : PrincipalChildList()) { + ReflowOutput childSize(aDesiredSize.GetWritingMode()); + GetReflowAndBoundingMetricsFor(childFrame, childSize, + childSize.mBoundingMetrics); + + // place and size the child; (dx,0) makes the caret happy - bug 188146 + dy = childSize.Height() == 0 ? 0 : aDesiredSize.BlockStartAscent() - childSize.BlockStartAscent(); + FinishReflowChild(childFrame, PresContext(), childSize, nullptr, dx, dy, 0); + dx += childSize.Width(); + } + } + + SetReference(nsPoint(0, aDesiredSize.BlockStartAscent())); + + return NS_OK; +} + |