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https://github.com/mozilla/gecko-dev.git
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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 -*-
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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.org code.
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*
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* The Initial Developer of the Original Code is
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* IBM Corporation. Portions created by IBM are
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* Copyright (C) 2000 IBM Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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*/
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#ifdef IBMBIDI
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#ifndef nsBidiPresUtils_h___
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#define nsBidiPresUtils_h___
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#include "nsVoidArray.h"
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#include "nsIFrame.h"
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#include "nsBidi.h"
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#include "nsBidiUtils.h"
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#include "nsCOMPtr.h"
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#include "nsDataHashtable.h"
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class nsBidiPresUtils {
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public:
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nsBidiPresUtils();
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~nsBidiPresUtils();
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PRBool IsSuccessful(void) const;
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/**
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* Make Bidi engine calculate the embedding levels of the frames that are
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* descendants of a given block frame.
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*
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* @param aPresContext The presContext
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* @param aBlockFrame The block frame
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* @param aFirstChild The first child frame of aBlockFrame
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* @param aForceReflow [OUT] Set if we delete frames and will need to
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* reflow the block frame
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* @param aIsVisualFormControl [IN] Set if we are in a form control on a
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* visual page.
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* @see nsHTMLReflowState::IsBidiFormControl
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*
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* @lina 06/18/2000
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*/
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nsresult Resolve(nsIPresContext* aPresContext,
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nsIFrame* aBlockFrame,
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nsIFrame* aFirstChild,
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PRBool& aForceReflow,
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PRBool aIsVisualFormControl);
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/**
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* Reorder this line using Bidi engine.
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* Update frame array, following the new visual sequence.
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*
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* @lina 05/02/2000
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*/
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void ReorderFrames(nsIPresContext* aPresContext,
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nsIRenderingContext* aRendContext,
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nsIFrame* aFirstChild,
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nsIFrame* aNextInFlow,
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PRInt32 aChildCount);
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/**
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* Format Unicode text, taking into account bidi capabilities
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* of the platform. The formatting includes: reordering, Arabic shaping,
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* symmetric and numeric swapping, removing control characters.
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*
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* @lina 06/18/2000
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*/
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nsresult FormatUnicodeText(nsIPresContext* aPresContext,
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PRUnichar* aText,
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PRInt32& aTextLength,
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nsCharType aCharType,
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PRBool aIsOddLevel,
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PRBool aIsBidiSystem);
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/**
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* Reorder Unicode text, taking into account bidi capabilities of the
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* platform. The reordering includes symmetric swapping and removing
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* control characters.
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*/
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nsresult ReorderUnicodeText(PRUnichar* aText,
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PRInt32& aTextLength,
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nsCharType aCharType,
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PRBool aIsOddLevel,
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PRBool aIsBidiSystem);
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/**
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* Return our nsBidi object (bidi reordering engine)
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*/
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nsresult GetBidiEngine(nsBidi** aBidiEngine);
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/**
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* Reorder plain text using the Unicode Bidi algorithm and send it to
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* a rendering context for rendering.
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*
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* @param aText the string to be rendered
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* @param aLength the number of characters in the string
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* @param aBaseDirection the base direction of the string
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* NSBIDI_LTR - left-to-right string
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* NSBIDI_RTL - right-to-left string
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* @param aPresContext the presentation context
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* @param aRenderingContext the rendering context
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* @param aTextRect contains the coordinates to render the string
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*/
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nsresult RenderText(PRUnichar* aText,
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PRInt32 aLength,
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nsBidiDirection aBaseDirection,
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nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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nscoord aX,
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nscoord aY);
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private:
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/**
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* Create a string containing entire text content of this block.
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*
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* @lina 05/02/2000
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*/
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void CreateBlockBuffer(nsIPresContext* aPresContext);
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/**
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* Set up an array of the frames after splitting frames so that each frame has
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* consistent directionality. At this point the frames are still in logical
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* order
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*/
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nsresult InitLogicalArray(nsIPresContext* aPresContext,
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nsIFrame* aCurrentFrame,
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nsIFrame* aNextInFlow,
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PRBool aAddMarkers = PR_FALSE);
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/**
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* Reorder the frame array from logical to visual order
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*
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* @param aPresContext the presentation context
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* @param aBidiEnabled TRUE on return if the visual order is different from
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* the logical order
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*/
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nsresult Reorder(nsIPresContext* aPresContext,
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PRBool& aBidiEnabled);
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/**
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* Adjust frame positions following their visual order
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*
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* @param <code>nsIPresContext*</code>, the first kid
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*
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* @lina 04/11/2000
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*/
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void RepositionInlineFrames(nsIPresContext* aPresContext,
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nsIRenderingContext* aRendContext,
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nsIFrame* aFirstChild,
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PRInt32 aChildCount) const;
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void RepositionContainerFrame(nsIPresContext* aPresContext,
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nsIFrame* aContainer,
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PRInt32& aMinX,
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PRInt32& aMaxX) const;
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/**
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* Helper method for Resolve()
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* Truncate a text frame and possibly create a continuation frame with the
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* remainder of its content.
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*
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* @param aPresContext the pres context
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* @param aContent the content of the frame
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* @param aFrame the original frame
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* @param aNewFrame [OUT] the new frame that was created
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* @param aFrameIndex [IN/OUT] index of aFrame in mLogicalFrames
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*
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* If there is already a bidi continuation for this frame in mLogicalFrames,
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* no new frame will be created. On exit aNewFrame will point to the existing
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* bidi continuation and aFrameIndex will contain its index.
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* @see Resolve()
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* @see RemoveBidiContinuation()
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*/
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PRBool EnsureBidiContinuation(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aFrame,
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nsIFrame** aNewFrame,
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PRInt32& aFrameIndex);
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/**
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* Helper method for Resolve()
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* Delete one or more bidi continuation frames created in a previous reflow by
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* EnsureBidiContinuation().
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* @param aPresContext the pres context
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* @param aFrame the frame whose continuations are to be removed
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* @param aFirstIndex index of aFrame in mLogicalFrames
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* @param aLastIndex index of the last frame to be removed
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* @param aOffset [OUT] count of directional frames removed. Since
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* directional frames have control characters
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* corresponding to them in mBuffer, the pointers to
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* mBuffer in Resolve() will need to be updated after
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* deleting the frames.
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*
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* @see Resolve()
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* @see EnsureBidiContinuation()
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*/
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void RemoveBidiContinuation(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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PRInt32 aFirstIndex,
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PRInt32 aLastIndex,
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PRInt32& aOffset) const;
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void CalculateCharType(PRInt32& aOffset,
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PRInt32 aCharTypeLimit,
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PRInt32& aRunLimit,
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PRInt32& aRunLength,
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PRInt32& aRunCount,
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PRUint8& aCharType,
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PRUint8& aPrevCharType) const;
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void StripBidiControlCharacters(PRUnichar* aText,
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PRInt32& aTextLength) const;
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nsAutoString mBuffer;
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nsVoidArray mLogicalFrames;
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nsVoidArray mVisualFrames;
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nsDataHashtable<nsISupportsHashKey, PRInt32> mContentToFrameIndex;
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PRInt32 mArraySize;
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PRInt32* mIndexMap;
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PRUint8* mLevels;
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nsresult mSuccess;
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nsBidi* mBidiEngine;
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};
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#endif /* nsBidiPresUtils_h___ */
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#endif // IBMBIDI
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