gecko/layout/mathml/nsMathMLmstyleFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* 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 "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsINameSpaceManager.h"
#include "nsMathMLmstyleFrame.h"
//
// <mstyle> -- style change
//
nsIFrame*
NS_NewMathMLmstyleFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmstyleFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmstyleFrame)
nsMathMLmstyleFrame::~nsMathMLmstyleFrame()
{
}
// mstyle needs special care for its scriptlevel and displaystyle attributes
NS_IMETHODIMP
nsMathMLmstyleFrame::InheritAutomaticData(nsIFrame* aParent)
{
// let the base class get the default from our parent
nsMathMLContainerFrame::InheritAutomaticData(aParent);
// sync with our current state
mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
mPresentationData.mstyle = this;
// see if the displaystyle attribute is there
nsMathMLFrame::FindAttrDisplaystyle(mContent, mPresentationData);
// see if the directionality attribute is there
nsMathMLFrame::FindAttrDirectionality(mContent, mPresentationData);
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmstyleFrame::TransmitAutomaticData()
{
return TransmitAutomaticDataForMrowLikeElement();
}
// displaystyle and scriptlevel are special in <mstyle>...
// Since UpdatePresentation() and UpdatePresentationDataFromChildAt() can be called
// by a parent, ensure that the explicit attributes of <mstyle> take precedence
NS_IMETHODIMP
nsMathMLmstyleFrame::UpdatePresentationData(uint32_t aFlagsValues,
uint32_t aWhichFlags)
{
if (NS_MATHML_HAS_EXPLICIT_DISPLAYSTYLE(mPresentationData.flags)) {
// our current state takes precedence, disallow updating the displastyle
aWhichFlags &= ~NS_MATHML_DISPLAYSTYLE;
aFlagsValues &= ~NS_MATHML_DISPLAYSTYLE;
}
return nsMathMLContainerFrame::UpdatePresentationData(aFlagsValues, aWhichFlags);
}
NS_IMETHODIMP
nsMathMLmstyleFrame::UpdatePresentationDataFromChildAt(int32_t aFirstIndex,
int32_t aLastIndex,
uint32_t aFlagsValues,
uint32_t aWhichFlags)
{
if (NS_MATHML_HAS_EXPLICIT_DISPLAYSTYLE(mPresentationData.flags)) {
// our current state takes precedence, disallow updating the displastyle
aWhichFlags &= ~NS_MATHML_DISPLAYSTYLE;
aFlagsValues &= ~NS_MATHML_DISPLAYSTYLE;
}
// let the base class worry about the update
return
nsMathMLContainerFrame::UpdatePresentationDataFromChildAt(
aFirstIndex, aLastIndex, aFlagsValues, aWhichFlags);
}
NS_IMETHODIMP
nsMathMLmstyleFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
// Other attributes can affect too many things, ask our parent to re-layout
// its children so that we can pick up changes in our attributes & transmit
// them in our subtree. However, our siblings will be re-laid too. We used
// to have a more speedier but more verbose alternative that didn't re-layout
// our siblings. See bug 114909 - attachment 67668.
return ReLayoutChildren(mParent);
}