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-rw-r--r--layout/mathml/nsMathMLTokenFrame.cpp196
1 files changed, 196 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLTokenFrame.cpp b/layout/mathml/nsMathMLTokenFrame.cpp
new file mode 100644
index 0000000000..5481e6faec
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+++ b/layout/mathml/nsMathMLTokenFrame.cpp
@@ -0,0 +1,196 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "mozilla/PresShell.h"
+#include "nsLayoutUtils.h"
+#include "nsPresContext.h"
+#include "nsContentUtils.h"
+#include "nsTextFrame.h"
+#include "gfxContext.h"
+#include <algorithm>
+
+using namespace mozilla;
+
+nsIFrame* NS_NewMathMLTokenFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
+ return new (aPresShell)
+ nsMathMLTokenFrame(aStyle, aPresShell->GetPresContext());
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsMathMLTokenFrame)
+
+nsMathMLTokenFrame::~nsMathMLTokenFrame() = default;
+
+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;
+ }
+
+ StyleMathVariant mathVariant = StyleFont()->mMathVariant;
+ if ((mathVariant == StyleMathVariant::None &&
+ (StyleFont()->mFont.style.IsItalic() ||
+ HasAnyStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI))) ||
+ mathVariant == StyleMathVariant::Italic ||
+ mathVariant == StyleMathVariant::BoldItalic ||
+ mathVariant == StyleMathVariant::SansSerifItalic ||
+ mathVariant == StyleMathVariant::SansSerifBoldItalic) {
+ 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->IsTextFrame()) {
+ 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, std::move(aChildList));
+ MarkTextFramesAsTokenMathML();
+}
+
+void nsMathMLTokenFrame::AppendFrames(ChildListID aListID,
+ nsFrameList&& aChildList) {
+ nsMathMLContainerFrame::AppendFrames(aListID, std::move(aChildList));
+ MarkTextFramesAsTokenMathML();
+}
+
+void nsMathMLTokenFrame::InsertFrames(
+ ChildListID aListID, nsIFrame* aPrevFrame,
+ const nsLineList::iterator* aPrevFrameLine, nsFrameList&& aChildList) {
+ nsMathMLContainerFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
+ std::move(aChildList));
+ MarkTextFramesAsTokenMathML();
+}
+
+void nsMathMLTokenFrame::Reflow(nsPresContext* aPresContext,
+ ReflowOutput& aDesiredSize,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus) {
+ MarkInReflow();
+ MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
+
+ 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());
+ WritingMode wm = childFrame->GetWritingMode();
+ LogicalSize availSize = aReflowInput.ComputedSize(wm);
+ availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
+ ReflowInput childReflowInput(aPresContext, aReflowInput, childFrame,
+ availSize);
+ nsReflowStatus childStatus;
+ ReflowChild(childFrame, aPresContext, childDesiredSize, childReflowInput,
+ childStatus);
+ NS_ASSERTION(childStatus.IsComplete(),
+ "We gave the child unconstrained available block-size, so its "
+ "status should be complete!");
+ SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
+ childDesiredSize.mBoundingMetrics);
+ }
+
+ // place and size children
+ FinalizeReflow(aReflowInput.mRenderingContext->GetDrawTarget(), aDesiredSize);
+
+ aStatus.Reset(); // This type of frame can't be split.
+}
+
+// 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,
+ ReflowChildFlags::Default);
+ dx += childSize.Width();
+ }
+ }
+
+ SetReference(nsPoint(0, aDesiredSize.BlockStartAscent()));
+
+ return NS_OK;
+}