gecko-dev/layout/mathml/nsMathMLmstyleFrame.cpp

142 строки
5.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla MathML Project.
*
* The Initial Developer of the Original Code is
* The University Of Queensland.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roger B. Sidje <rbs@maths.uq.edu.au>
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsINameSpaceManager.h"
#include "nsIRenderingContext.h"
#include "nsIFontMetrics.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);
return NS_OK;
}
NS_IMETHODIMP
nsMathMLmstyleFrame::TransmitAutomaticData()
{
// Nothing particular to do here, the values that we computed in
// InheritAutomaticData() are the values that we wanted to pass to
// our children. Our children would have inherited these values in
// their own InheritAutomaticData() as we descended the frame tree.
return NS_OK;
}
// 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(PRUint32 aFlagsValues,
PRUint32 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(PRInt32 aFirstIndex,
PRInt32 aLastIndex,
PRUint32 aFlagsValues,
PRUint32 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(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 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);
}