mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-13 23:17:57 +00:00
239 lines
8.9 KiB
C++
239 lines
8.9 KiB
C++
/* -*- 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"
|
|
#include "nsDataHashtable.h"
|
|
|
|
class nsBidiPresUtils {
|
|
public:
|
|
nsBidiPresUtils();
|
|
~nsBidiPresUtils();
|
|
PRBool IsSuccessful(void) const;
|
|
|
|
/**
|
|
* Make Bidi engine calculate the embedding levels of the frames that are
|
|
* descendants of a given block frame.
|
|
*
|
|
* @param aPresContext The presContext
|
|
* @param aBlockFrame The block frame
|
|
* @param aFirstChild The first child frame of aBlockFrame
|
|
* @param aForceReflow [OUT] Set if we delete frames and will need to
|
|
* reflow the block frame
|
|
* @param aIsVisualFormControl [IN] Set if we are in a form control on a
|
|
* visual page.
|
|
* @see nsHTMLReflowState::IsBidiFormControl
|
|
*
|
|
* @lina 06/18/2000
|
|
*/
|
|
nsresult Resolve(nsIPresContext* aPresContext,
|
|
nsIFrame* aBlockFrame,
|
|
nsIFrame* aFirstChild,
|
|
PRBool& aForceReflow,
|
|
PRBool aIsVisualFormControl);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* Reorder Unicode text, taking into account bidi capabilities of the
|
|
* platform. The reordering includes symmetric swapping and removing
|
|
* control characters.
|
|
*/
|
|
nsresult ReorderUnicodeText(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
|
|
*/
|
|
nsresult RenderText(PRUnichar* aText,
|
|
PRInt32 aLength,
|
|
nsBidiDirection aBaseDirection,
|
|
nsIPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nscoord aX,
|
|
nscoord aY);
|
|
|
|
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;
|
|
/**
|
|
* Helper method for Resolve()
|
|
* Truncate a text frame and possibly create a continuation frame with the
|
|
* remainder of its content.
|
|
*
|
|
* @param aPresContext the pres context
|
|
* @param aContent the content of the frame
|
|
* @param aFrame the original frame
|
|
* @param aNewFrame [OUT] the new frame that was created
|
|
* @param aFrameIndex [IN/OUT] index of aFrame in mLogicalFrames
|
|
*
|
|
* If there is already a bidi continuation for this frame in mLogicalFrames,
|
|
* no new frame will be created. On exit aNewFrame will point to the existing
|
|
* bidi continuation and aFrameIndex will contain its index.
|
|
* @see Resolve()
|
|
* @see RemoveBidiContinuation()
|
|
*/
|
|
PRBool EnsureBidiContinuation(nsIPresContext* aPresContext,
|
|
nsIContent* aContent,
|
|
nsIFrame* aFrame,
|
|
nsIFrame** aNewFrame,
|
|
PRInt32& aFrameIndex);
|
|
|
|
/**
|
|
* Helper method for Resolve()
|
|
* Delete one or more bidi continuation frames created in a previous reflow by
|
|
* EnsureBidiContinuation().
|
|
* @param aPresContext the pres context
|
|
* @param aFrame the frame whose continuations are to be removed
|
|
* @param aFirstIndex index of aFrame in mLogicalFrames
|
|
* @param aLastIndex index of the last frame to be removed
|
|
* @param aOffset [OUT] count of directional frames removed. Since
|
|
* directional frames have control characters
|
|
* corresponding to them in mBuffer, the pointers to
|
|
* mBuffer in Resolve() will need to be updated after
|
|
* deleting the frames.
|
|
*
|
|
* @see Resolve()
|
|
* @see EnsureBidiContinuation()
|
|
*/
|
|
void RemoveBidiContinuation(nsIPresContext* aPresContext,
|
|
nsIFrame* aFrame,
|
|
PRInt32 aFirstIndex,
|
|
PRInt32 aLastIndex,
|
|
PRInt32& aOffset) const;
|
|
void CalculateCharType(PRInt32& aOffset,
|
|
PRInt32 aCharTypeLimit,
|
|
PRInt32& aRunLimit,
|
|
PRInt32& aRunLength,
|
|
PRInt32& aRunCount,
|
|
PRUint8& aCharType,
|
|
PRUint8& aPrevCharType) const;
|
|
|
|
void StripBidiControlCharacters(PRUnichar* aText,
|
|
PRInt32& aTextLength) const;
|
|
nsAutoString mBuffer;
|
|
nsVoidArray mLogicalFrames;
|
|
nsVoidArray mVisualFrames;
|
|
nsDataHashtable<nsISupportsHashKey, PRInt32> mContentToFrameIndex;
|
|
PRInt32 mArraySize;
|
|
PRInt32* mIndexMap;
|
|
PRUint8* mLevels;
|
|
nsresult mSuccess;
|
|
|
|
nsBidi* mBidiEngine;
|
|
};
|
|
|
|
#endif /* nsBidiPresUtils_h___ */
|
|
|
|
#endif // IBMBIDI
|