зеркало из https://github.com/mozilla/gecko-dev.git
100 строки
3.4 KiB
C++
100 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsINameSpaceManager.h"
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#include "nsMathMLmstyleFrame.h"
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//
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// <mstyle> -- style change
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//
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nsIFrame*
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NS_NewMathMLmstyleFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmstyleFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmstyleFrame)
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nsMathMLmstyleFrame::~nsMathMLmstyleFrame()
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{
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}
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// mstyle needs special care for its scriptlevel and displaystyle attributes
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NS_IMETHODIMP
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nsMathMLmstyleFrame::InheritAutomaticData(nsIFrame* aParent)
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{
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// let the base class get the default from our parent
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nsMathMLContainerFrame::InheritAutomaticData(aParent);
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// sync with our current state
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mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
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mPresentationData.mstyle = this;
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// see if the displaystyle attribute is there
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nsMathMLFrame::FindAttrDisplaystyle(mContent, mPresentationData);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmstyleFrame::TransmitAutomaticData()
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{
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return TransmitAutomaticDataForMrowLikeElement();
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}
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// displaystyle and scriptlevel are special in <mstyle>...
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// Since UpdatePresentation() and UpdatePresentationDataFromChildAt() can be called
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// by a parent, ensure that the explicit attributes of <mstyle> take precedence
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NS_IMETHODIMP
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nsMathMLmstyleFrame::UpdatePresentationData(uint32_t aFlagsValues,
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uint32_t aWhichFlags)
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{
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if (NS_MATHML_HAS_EXPLICIT_DISPLAYSTYLE(mPresentationData.flags)) {
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// our current state takes precedence, disallow updating the displastyle
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aWhichFlags &= ~NS_MATHML_DISPLAYSTYLE;
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aFlagsValues &= ~NS_MATHML_DISPLAYSTYLE;
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}
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return nsMathMLContainerFrame::UpdatePresentationData(aFlagsValues, aWhichFlags);
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}
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NS_IMETHODIMP
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nsMathMLmstyleFrame::UpdatePresentationDataFromChildAt(int32_t aFirstIndex,
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int32_t aLastIndex,
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uint32_t aFlagsValues,
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uint32_t aWhichFlags)
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{
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if (NS_MATHML_HAS_EXPLICIT_DISPLAYSTYLE(mPresentationData.flags)) {
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// our current state takes precedence, disallow updating the displastyle
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aWhichFlags &= ~NS_MATHML_DISPLAYSTYLE;
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aFlagsValues &= ~NS_MATHML_DISPLAYSTYLE;
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}
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// let the base class worry about the update
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return
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nsMathMLContainerFrame::UpdatePresentationDataFromChildAt(
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aFirstIndex, aLastIndex, aFlagsValues, aWhichFlags);
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}
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NS_IMETHODIMP
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nsMathMLmstyleFrame::AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType)
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{
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// Other attributes can affect too many things, ask our parent to re-layout
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// its children so that we can pick up changes in our attributes & transmit
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// them in our subtree. However, our siblings will be re-laid too. We used
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// to have a more speedier but more verbose alternative that didn't re-layout
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// our siblings. See bug 114909 - attachment 67668.
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return ReLayoutChildren(mParent);
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}
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