gecko-dev/layout/mathml/nsMathMLSelectedFrame.cpp

155 строки
5.4 KiB
C++

/* -*- 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 "nsMathMLSelectedFrame.h"
#include "nsDisplayList.h"
nsMathMLSelectedFrame::~nsMathMLSelectedFrame()
{
}
void
nsMathMLSelectedFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
// Init our local attributes
mInvalidMarkup = false;
mSelectedFrame = nullptr;
// Let the base class do the rest
nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
NS_IMETHODIMP
nsMathMLSelectedFrame::TransmitAutomaticData()
{
// Note that to determine space-like and embellished op properties:
// - <semantics> behaves the same as <maction>
// - <annotation-xml> behaves the same as <mrow>
// The REC defines the following element to be space-like:
// * an maction element whose selected sub-expression exists and is
// space-like;
nsIMathMLFrame* mathMLFrame = do_QueryFrame(mSelectedFrame);
if (mathMLFrame && mathMLFrame->IsSpaceLike()) {
mPresentationData.flags |= NS_MATHML_SPACE_LIKE;
} else {
mPresentationData.flags &= ~NS_MATHML_SPACE_LIKE;
}
// The REC defines the following element to be an embellished operator:
// * an maction element whose selected sub-expression exists and is an
// embellished operator;
mPresentationData.baseFrame = mSelectedFrame;
GetEmbellishDataFrom(mSelectedFrame, mEmbellishData);
return NS_OK;
}
nsresult
nsMathMLSelectedFrame::ChildListChanged(int32_t aModType)
{
GetSelectedFrame();
return nsMathMLContainerFrame::ChildListChanged(aModType);
}
NS_IMETHODIMP
nsMathMLSelectedFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
nsresult rv = nsMathMLContainerFrame::SetInitialChildList(aListID,
aChildList);
// This very first call to GetSelectedFrame() will cause us to be marked as an
// embellished operator if the selected child is an embellished operator
GetSelectedFrame();
return rv;
}
// Only paint the selected child...
void
nsMathMLSelectedFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
// Report an error if something wrong was found in this frame.
// We can't call nsDisplayMathMLError from here,
// so ask nsMathMLContainerFrame to do the work for us.
if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
return;
}
DisplayBorderBackgroundOutline(aBuilder, aLists);
nsIFrame* childFrame = GetSelectedFrame();
if (childFrame) {
// Put the child's background directly onto the content list
nsDisplayListSet set(aLists, aLists.Content());
// The children should be in content order
BuildDisplayListForChild(aBuilder, childFrame, aDirtyRect, set);
}
#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
// visual debug
DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics, aLists);
#endif
}
// Only reflow the selected child ...
NS_IMETHODIMP
nsMathMLSelectedFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
aStatus = NS_FRAME_COMPLETE;
aDesiredSize.width = aDesiredSize.height = 0;
aDesiredSize.ascent = 0;
mBoundingMetrics = nsBoundingMetrics();
nsIFrame* childFrame = GetSelectedFrame();
if (childFrame) {
nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
nsHTMLReflowState childReflowState(aPresContext, aReflowState,
childFrame, availSize);
rv = ReflowChild(childFrame, aPresContext, aDesiredSize,
childReflowState, aStatus);
SaveReflowAndBoundingMetricsFor(childFrame, aDesiredSize,
aDesiredSize.mBoundingMetrics);
mBoundingMetrics = aDesiredSize.mBoundingMetrics;
}
FinalizeReflow(*aReflowState.rendContext, aDesiredSize);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return rv;
}
// Only place the selected child ...
/* virtual */ nsresult
nsMathMLSelectedFrame::Place(nsRenderingContext& aRenderingContext,
bool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
nsIFrame* childFrame = GetSelectedFrame();
if (mInvalidMarkup) {
return ReflowError(aRenderingContext, aDesiredSize);
}
aDesiredSize.width = aDesiredSize.height = 0;
aDesiredSize.ascent = 0;
mBoundingMetrics = nsBoundingMetrics();
if (childFrame) {
GetReflowAndBoundingMetricsFor(childFrame, aDesiredSize, mBoundingMetrics);
if (aPlaceOrigin) {
FinishReflowChild(childFrame, PresContext(), nullptr, aDesiredSize, 0, 0, 0);
}
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
}
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
return NS_OK;
}