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/* -*- 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
#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!");
// 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);
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;
}