зеркало из https://github.com/mozilla/pjs.git
Helper class use for wrapping non-MathML elements (e.g., html:img) so that they can mix better with other surrounding MathML markups. Factored previous code here and added hooks that were needed for child list operations
This commit is contained in:
rbs%maths.uq.edu.au
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d089c910d6
Коммит
6aef15cf85
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla MathML Project.
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*
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* The Initial Developer of the Original Code is The University Of
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* Queensland. Portions created by The University Of Queensland are
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* Copyright (C) 1999 The University Of Queensland. All Rights Reserved.
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*
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* Contributor(s):
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* Roger B. Sidje <rbs@maths.uq.edu.au>
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*/
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//
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// a helper frame class to wrap non-MathML frames so that foreign elements
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// (e.g., html:img) can mix better with other surrounding MathML markups
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//
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#include "nsCOMPtr.h"
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#include "nsHTMLParts.h"
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#include "nsIHTMLContent.h"
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#include "nsFrame.h"
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#include "nsAreaFrame.h"
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#include "nsLineLayout.h"
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#include "nsHTMLIIDs.h"
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#include "nsIPresContext.h"
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#include "nsHTMLAtoms.h"
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#include "nsUnitConversion.h"
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#include "nsIStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsINameSpaceManager.h"
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#include "nsIRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsStyleUtil.h"
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#include "nsMathMLForeignFrameWrapper.h"
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NS_IMPL_ADDREF_INHERITED(nsMathMLForeignFrameWrapper, nsMathMLFrame)
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NS_IMPL_RELEASE_INHERITED(nsMathMLForeignFrameWrapper, nsMathMLFrame)
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NS_IMPL_QUERY_INTERFACE_INHERITED1(nsMathMLForeignFrameWrapper, nsBlockFrame, nsMathMLFrame)
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nsresult
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NS_NewMathMLForeignFrameWrapper(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
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{
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NS_PRECONDITION(aNewFrame, "null OUT ptr");
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if (nsnull == aNewFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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nsMathMLForeignFrameWrapper* it = new (aPresShell) nsMathMLForeignFrameWrapper;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLForeignFrameWrapper::Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsIStyleContext* aContext,
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nsIFrame* aPrevInFlow)
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{
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nsresult rv;
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rv = nsBlockFrame::Init(aPresContext, aContent, aParent, aContext, aPrevInFlow);
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// let the base class inherit the scriptlevel and displaystyle from our parent
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nsMathMLFrame::InheritAutomaticData(aPresContext, aParent);
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return rv;
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}
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NS_IMETHODIMP
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nsMathMLForeignFrameWrapper::Reflow(nsIPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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// Let the base class do the reflow
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nsresult rv = nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
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mReference.x = 0;
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mReference.y = aDesiredSize.ascent;
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// just make-up a bounding metrics
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mBoundingMetrics.Clear();
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mBoundingMetrics.ascent = aDesiredSize.ascent;
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mBoundingMetrics.descent = aDesiredSize.descent;
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mBoundingMetrics.width = aDesiredSize.width;
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mBoundingMetrics.leftBearing = 0;
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mBoundingMetrics.rightBearing = aDesiredSize.width;
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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return rv;
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}
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@ -0,0 +1,150 @@
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla MathML Project.
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*
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* The Initial Developer of the Original Code is The University Of
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* Queensland. Portions created by The University Of Queensland are
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* Copyright (C) 1999 The University Of Queensland. All Rights Reserved.
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*
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* Contributor(s):
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* Roger B. Sidje <rbs@maths.uq.edu.au>
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*/
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//
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// a helper frame class to wrap non-MathML frames so that foreign elements
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// (e.g., html:img) can mix better with other surrounding MathML markups
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//
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#ifndef nsMathMLForeignFrameWrapper_h___
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#define nsMathMLForeignFrameWrapper_h___
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#include "nsCOMPtr.h"
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#include "nsMathMLContainerFrame.h"
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class nsMathMLForeignFrameWrapper : public nsBlockFrame,
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public nsMathMLFrame {
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public:
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friend nsresult NS_NewMathMLForeignFrameWrapper(nsIPresShell* aPresShell, nsIFrame** aNewFrame);
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NS_DECL_ISUPPORTS_INHERITED
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// Overloaded nsIMathMLFrame methods
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NS_IMETHOD
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UpdatePresentationDataFromChildAt(nsIPresContext* aPresContext,
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PRInt32 aFirstIndex,
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PRInt32 aLastIndex,
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PRInt32 aScriptLevelIncrement,
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PRUint32 aFlagsValues,
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PRUint32 aFlagsToUpdate)
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{
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nsMathMLContainerFrame::PropagatePresentationDataFromChildAt(aPresContext, this,
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aFirstIndex, aLastIndex, aScriptLevelIncrement, aFlagsValues, aFlagsToUpdate);
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return NS_OK;
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}
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NS_IMETHOD
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ReResolveScriptStyle(nsIPresContext* aPresContext,
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PRInt32 aParentScriptLevel)
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{
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nsMathMLContainerFrame::PropagateScriptStyleFor(aPresContext, this, aParentScriptLevel);
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return NS_OK;
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}
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// overloaded nsBlockFrame methods
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NS_IMETHOD
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Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsIStyleContext* aContext,
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nsIFrame* aPrevInFlow);
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#ifdef NS_DEBUG
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NS_IMETHOD
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SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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nsresult rv = nsBlockFrame::SetInitialChildList(aPresContext, aListName, aChildList);
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// cannot use mFrames{.FirstChild()|.etc} since the block code doesn't set mFrames
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nsFrameList frameList(aChildList);
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NS_ASSERTION(frameList.FirstChild() && frameList.GetLength() == 1,
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"there must be one and only one child frame");
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return rv;
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}
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#endif
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NS_IMETHOD
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Reflow(nsIPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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// we are just a wrapper and these methods shouldn't be called
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NS_IMETHOD
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AppendFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aFrameList)
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{
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NS_NOTREACHED("unsupported operation");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHOD
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InsertFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList)
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{
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NS_NOTREACHED("unsupported operation");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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// need special care here because the base class implementation treats this
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// as two operations: remove & insert; In our case, removing the child will
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// remove us too... so we have to operate from our parent's perspective
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NS_IMETHOD
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ReplaceFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame)
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{
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nsresult rv = mParent->ReplaceFrame(aPresContext, aPresShell, aListName, this, aNewFrame);
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// XXX the usage of ReplaceFrame() vs. ReplaceFrameAndDestroy() is
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// XXX ambiguous - see bug 122748. The style system doesn't call ReplaceFrame()
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// XXX and that's why nobody seems to have been biten by the ambiguity yet
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aOldFrame->Destroy(aPresContext);
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return rv;
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}
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// Our life is bound to the life of our unique child.
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// When our child goes away, we ask our parent to delete us
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NS_IMETHOD
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RemoveFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame)
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{
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nsBlockFrame::RemoveFrame(aPresContext, aPresShell, aListName, aOldFrame);
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return mParent->RemoveFrame(aPresContext, aPresShell, aListName, this);
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}
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protected:
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nsMathMLForeignFrameWrapper() {}
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virtual ~nsMathMLForeignFrameWrapper() {}
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};
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#endif /* nsMathMLForeignFrameWrapper_h___ */
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