133 lines
4.7 KiB
C++
133 lines
4.7 KiB
C++
/*
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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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* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
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*/
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#ifndef nsMathMLContainerFrame_h___
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#define nsMathMLContainerFrame_h___
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#include "nsCOMPtr.h"
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#include "nsIViewManager.h"
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#include "nsHTMLContainerFrame.h"
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#include "nsBlockFrame.h"
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#include "nsInlineFrame.h"
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#include "nsMathMLAtoms.h"
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#include "nsMathMLOperators.h"
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#include "nsMathMLChar.h"
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#include "nsIMathMLFrame.h"
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#include "nsMathMLParts.h"
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/*
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* Base class for MathML container frames. It acts like an inferred
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* mrow. By default, this frame uses its Reflow() method to lay its
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* children horizontally and ensure that their baselines are aligned.
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*
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* This frame is a *math-aware frame* in the sense that given the markup
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* <tag>base arguments</tag>, the method InsertScriptLevelStyleContext()
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* can be used to render the 'base' in normal-font, and the 'arguments'
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* in small-font. This is a common functionality to tags like msub, msup,
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* msubsup, mover, munder, munderover, mmultiscripts. All are derived
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* from this base class. They use SetInitialChildList() to trigger
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* InsertScriptLevelStyleContext() for the very first time as soon as all
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* their children are known. However, each of these tags has its own Reflow()
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* method to lay its children as appropriate, thus overriding the default
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* Reflow() method in this base class.
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*
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* Other tags like mi that do not have 'arguments' can be derived from
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* this base class as well. The class caters for empty arguments.
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* Notice that mi implements its own SetInitialChildList() method
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* to switch to a normal-font (rather than italics) if its text content
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* is not a single character (as per the MathML REC).
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*
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*/
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class nsMathMLContainerFrame : public nsHTMLContainerFrame, public nsIMathMLFrame {
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public:
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// nsIMathMLFrame methods
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
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NS_IMETHOD_(nsrefcnt) AddRef(void);
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NS_IMETHOD_(nsrefcnt) Release(void);
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NS_IMETHOD Stretch(nsIPresContext& aPresContext,
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nsStretchDirection aStretchDirection,
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nsCharMetrics& aContainerSize,
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nsCharMetrics& aDesiredStretchSize);
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NS_IMETHOD
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GetPresentationData(PRInt32* aScriptLevel,
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PRBool* aDisplayStyle);
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NS_IMETHOD
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UpdatePresentationData(PRInt32 aScriptLevelIncrement,
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PRBool aDisplayStyle);
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NS_IMETHOD
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UpdatePresentationDataFromChildAt(PRInt32 aIndex,
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PRInt32 aScriptLevelIncrement,
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PRBool aDisplayStyle);
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// nsHTMLContainerFrame 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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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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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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// helper method for altering the style contexts of subscript/superscript elements
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NS_IMETHOD
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InsertScriptLevelStyleContext(nsIPresContext& aPresContext);
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// helper methods for processing empty MathML frames (with whitespace only)
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static PRBool
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IsOnlyWhitespace(nsIFrame* aFrame);
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static void
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ReflowEmptyChild(nsIPresContext& aPresContext,
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nsIFrame* aFrame);
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protected:
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PRInt32 mScriptLevel; // Relevant to nested frames within: msub, msup, msubsup, munder,
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// mover, munderover, mmultiscripts, mfrac, mroot, mtable.
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PRBool mDisplayStyle; // displaystyle="false" is intended to slightly alter how the
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// rendering is done in inline mode.
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virtual PRIntn GetSkipSides() const { return 0; }
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};
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#endif /* nsMathMLContainerFrame_h___ */
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