pjs/layout/base/nsBidiPresUtils.h

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C
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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.org code.
*
* The Initial Developer of the Original Code is
* IBM Corporation. Portions created by IBM are
* Copyright (C) 2000 IBM Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
*/
#ifdef IBMBIDI
#ifndef nsBidiPresUtils_h___
#define nsBidiPresUtils_h___
#include "nsVoidArray.h"
#include "nsIFrame.h"
#include "nsBidi.h"
#include "nsBidiUtils.h"
#include "nsCOMPtr.h"
class nsBidiPresUtils {
public:
nsBidiPresUtils();
~nsBidiPresUtils();
PRBool IsSuccessful(void) const;
/**
* Make Bidi engine calculate embedding levels of the frames.
*
* @lina 06/18/2000
*/
nsresult Resolve(nsIPresContext* aPresContext,
nsIFrame* aBlockFrame,
nsIFrame* aFirstChild,
PRBool& aForceReflow);
/**
* Reorder this line using Bidi engine.
* Update frame array, following the new visual sequence.
*
* @lina 05/02/2000
*/
void ReorderFrames(nsIPresContext* aPresContext,
nsIRenderingContext* aRendContext,
nsIFrame* aFirstChild,
nsIFrame* aNextInFlow,
PRInt32 aChildCount);
/**
* Format Unicode text, taking into account bidi capabilities
* of the platform. The formatting includes: reordering, Arabic shaping,
* symmetric and numeric swapping, removing control characters.
*
* @lina 06/18/2000
*/
nsresult FormatUnicodeText(nsIPresContext* aPresContext,
PRUnichar* aText,
PRInt32& aTextLength,
nsCharType aCharType,
PRBool aIsOddLevel,
PRBool aIsBidiSystem);
/**
* Return our nsBidi object (bidi reordering engine)
*/
nsresult GetBidiEngine(nsBidi** aBidiEngine);
/**
* Reorder plain text using the Unicode Bidi algorithm and send it to
* a rendering context for rendering.
*
* @param aText the string to be rendered
* @param aLength the number of characters in the string
* @param aBaseDirection the base direction of the string
* NSBIDI_LTR - left-to-right string
* NSBIDI_RTL - right-to-left string
* @param aPresContext the presentation context
* @param aRenderingContext the rendering context
* @param aTextRect contains the coordinates to render the string
*/
2001-11-13 00:40:03 +03:00
nsresult RenderText(PRUnichar* aText,
PRInt32 aLength,
nsBidiDirection aBaseDirection,
nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nscoord aX,
nscoord aY);
/**
* Scan a Unichar string, converting numbers to Arabic or Hindi forms in place
* @param aBuffer is the string
* @param aSize is the size of aBuffer
* @param aNumFlag specifies the conversion to perform:
* IBMBIDI_NUMERAL_HINDI: convert to Hindi forms (Unicode 0660-0669)
* IBMBIDI_NUMERAL_ARABIC: convert to Arabic forms (Unicode 0030-0039)
* IBMBIDI_NUMERAL_HINDICONTEXT: convert numbers in Arabic text to Hindi, otherwise to Arabic
*/
nsresult HandleNumbers(PRUnichar* aBuffer, PRUint32 aSize, PRUint32 aNumFlag);
/**
* Scan an nsString, converting numerals to Arabic or Hindi forms
* @param aSrc is the input string
* @param aDst is the output string
*/
nsresult HandleNumbers(const nsString& aSrc, nsString& aDst);
private:
/**
* Create a string containing entire text content of this block.
*
* @lina 05/02/2000
*/
void CreateBlockBuffer(nsIPresContext* aPresContext);
/**
* Set up an array of the frames after splitting frames so that each frame has
* consistent directionality. At this point the frames are still in logical
* order
*/
nsresult InitLogicalArray(nsIPresContext* aPresContext,
nsIFrame* aCurrentFrame,
nsIFrame* aNextInFlow,
PRBool aAddMarkers = PR_FALSE);
/**
* Reorder the frame array from logical to visual order
*
* @param aPresContext the presentation context
* @param aBidiEnabled TRUE on return if the visual order is different from
* the logical order
*/
nsresult Reorder(nsIPresContext* aPresContext,
PRBool& aBidiEnabled);
/**
* Adjust frame positions following their visual order
*
* @param <code>nsIPresContext*</code>, the first kid
*
* @lina 04/11/2000
*/
void RepositionInlineFrames(nsIPresContext* aPresContext,
nsIRenderingContext* aRendContext,
nsIFrame* aFirstChild,
PRInt32 aChildCount) const;
void RepositionContainerFrame(nsIPresContext* aPresContext,
nsIFrame* aContainer,
PRInt32& aMinX,
PRInt32& aMaxX) const;
PRBool EnsureBidiContinuation(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aFrame,
nsIFrame** aNewFrame,
PRInt32& aFrameIndex);
PRBool RemoveBidiContinuation(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIFrame* aNextFrame,
nsIContent* aContent,
PRInt32& aFrameIndex,
PRInt32& aOffset) const;
void CalculateCharType(PRInt32& aOffset,
PRInt32 aCharTypeLimit,
PRInt32& aRunLimit,
PRInt32& aRunLength,
PRInt32& aRunCount,
PRUint8& aCharType,
PRUint8& aPrevCharType) const;
nsAutoString mBuffer;
nsVoidArray mLogicalFrames;
nsVoidArray mVisualFrames;
PRInt32 mArraySize;
PRInt32* mIndexMap;
PRUint8* mLevels;
nsresult mSuccess;
PRUint32 mNumflag;
nsBidi* mBidiEngine;
};
#endif /* nsBidiPresUtils_h___ */
#endif // IBMBIDI