author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:02:46 +0200 | |
changeset 0 | 1fb32624e06b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* classes used in the implementation of CTmTextLayout |
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* |
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*/ |
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#ifndef TMLAYOUTIMP_H_ |
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#define TMLAYOUTIMP_H_ |
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#include "TMSTD.H" |
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#include <bidi.h> |
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class CTmFormatContext; |
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/** |
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A chunk of text is a reference to a run of characters that have constant |
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character format, directionality, stretchiness and that are to be drawn on |
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the same line. It includes information about the dimensions of the chunk |
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when rendered. |
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@internalComponent |
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*/ |
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class TTmChunk |
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{ |
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public: |
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TTmChunk(); |
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TTmChunk& operator=(const TTmChunk& aChunk) { Mem::Copy(this,&aChunk,sizeof(TTmChunk)); return *this; } |
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/** |
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Information returned by SetL |
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@internalComponent |
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*/ |
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class TInfo |
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{ |
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public: |
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TInfo(): iAtLineEnd(EFalse), iAtParEnd(EFalse), iTruncated(EFalse), iBdCat(TChar::EOtherNeutral), iEllipsisWidth(0) { } |
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TBool iAtLineEnd; // true if the new chunk is at the end of a line |
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TBool iAtParEnd; // true if the new chunk is at the end of a paragraph |
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TBool iTruncated; // true if the chunk was cut short to fit the measure |
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TChar::TBdCategory iBdCat; // the bidirectional category of the chunk |
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TInt iEllipsisWidth; // the width of any ellipsis allowed for, if truncating with ellipsis |
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}; |
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void SetL(CTmFormatContext& aContext, TInt aStartChar, TInt aStartXPos, TInt aMaxChar, TInt aMaxXPos, |
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TBool aAllowSpaceForFinalInlineText, TInfo& aInfo); |
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private: |
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void TruncateIfNeeded(CTmFormatContext& aContext, TPtrC& aText, TInfo& aInfo); |
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public: |
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TInt iDocPos; // position of the start of the text in the document |
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TInt iTextLength; // length of the text |
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TTmCharFormat iFormat; // the text's format |
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TInt iWidth; // width of the text in pixels |
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TInt iStandardWidth; // width before modification |
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// centre and right tabs may be reduced in size, soft hyphens are zeroed if |
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// non-final, and text may be stretched for full justification |
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TInt iAscent; // font ascent |
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TInt iDescent; // font descent |
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TInt iMaxCharHeight; // greatest character height |
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TInt iMaxCharDepth; // greatest character depth |
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TInt iFontMaxHeight; // maximum height of any character in the font |
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TInt iFontMaxDepth; // maximum depth of any character in the font |
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TInt iBaselineOffset; // -ve(above)/0/+ve baseline offset from CFont in pixels |
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TInt iStretch; // stretchability level (non-zero means space can be appended when fully justifying) |
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enum TType |
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{ |
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ETabFlag = 0x80, |
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ETextChunk = 0, // ordinary text |
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EStretchedChunk = 1, // text plus extra space for justification |
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EPictureChunk = 2, // a picture |
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ESoftHyphenChunk = 3, // a soft (potential) hyphen |
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EStandardTabChunk = ETabFlag | 0, // a left-aligning tab |
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ECenterTabChunk = ETabFlag | 1, // a centring tab |
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EReverseTabChunk = ETabFlag | 2 // a right-aligning tab |
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}; |
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TType iType; // the type of this chunk |
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// Indicates that the chunk must not be amalgamated with its successor |
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TBool iForcedChunkEnd; |
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// Indicates that the chunk must not be amalgamated with its predecessor |
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TBool iForcedChunkStart; |
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TInt iInitialInlineWidth; // the width occupied by any inline text attached to the start of this chunk |
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TInt iFinalInlineWidth; // the width occupied by any inline text attached to the end of this chunk |
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TInt iOverlappingChars; // the number of characters, at the end of this chunk, that overlap and |
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// will also be inserted at the beginning of the following chunk. |
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103 |
|
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// Context characters: These one character context data members are used by the rendering code in GDI |
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// to render punctuation marks based on the context. The context here represents the script in which to render the punctuation. |
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TUint iContextChar; // One character of context stored per chunk. This context is either taken from the |
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// previous chunk (if it has context), or from the previous line (if its the first chunk |
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// in the current line). This value will hence move through the chunks ONLY IF IT IS NOT NULL. |
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// If it is NULL, then the context from the last non-NULL context chunk is taken. |
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// See RTmTextCache::AdvanceWidthL() and CTmChunk::SetL() |
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TUint iContextCharInByteCode; // One character of context stored per chunk to be stored in the byte code once the |
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// chunk has been formatted. This is different from iContextChar as this can be NULL, |
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// in which case it is NOT stored in the byte code. See RTmTextCache::AdvanceWidthL() and CTmline::WriteCodeL() |
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}; |
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115 |
|
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/** |
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A line of text, including the chunks that make it up, in which direction |
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they flow and where it appears. |
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119 |
|
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@internalComponent |
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*/ |
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class CTmLine |
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123 |
{ |
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124 |
public: |
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class TEllipsisInfo |
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{ |
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127 |
public: |
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TEllipsisInfo(): iParEndPos(KMaxTInt), iEllipsisFormat(0), iEllipsisWidth(0), |
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iAtLineEnd(EFalse), iAtParEnd(EFalse) { } |
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TInt iParEndPos; // end of paragraph |
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TInt iEllipsisFormat; // index of character position that provides ellipsis format |
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TInt iEllipsisWidth; // width of ellipsis if any |
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TBool iAtLineEnd; // true if the new chunk is at the end of a line |
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TBool iAtParEnd; // true if the new chunk is at the end of a paragraph |
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135 |
}; |
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136 |
|
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CTmLine(); |
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void FormatL(CTmFormatContext& aContext); |
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void WriteCodeL(CTmFormatContext& aContext); |
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TInt NextLineStartChar() const { return iNextLineStartChar; } |
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TInt AtParEnd() const { return iAtParEnd; } |
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TInt Height() const { return iHeight; } |
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const TRect& InnerBounds() const { return iInnerBounds; } |
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TUint GetContextChar() const { return iContextChar; } |
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void SetContextChar(TUint aContext, TBool aFromChunk); |
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146 |
|
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147 |
|
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148 |
private: |
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void BreakL(CTmFormatContext& aContext,TInt aStartXCoord,TInt aWrapXCoord); |
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void WriteLabelCodeL(CTmFormatContext& aContext,MTmSource::TLabelType aLabelType); |
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void WriteBdStateL(CTmFormatContext& aContext); |
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void AppendChunksL(CTmFormatContext& aContext,TInt& aStartChar,TInt& aStartXPos,TInt aMaxChar,TInt aMaxXPos, |
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TBool aAllowSpaceForFinalInlineText,CTmLine::TEllipsisInfo& aEllipsisInfo); |
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TBool AppendChunkL(CTmFormatContext& aContext,TInt& aStartChar,TInt& aStartXPos,TInt aMaxChar,TInt aMaxXPos, |
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TBool aAllowSpaceForFinalInlineText,CTmLine::TEllipsisInfo& aEllipsisInfo); |
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void CalculateMetrics(CTmFormatContext& aContext,TInt& aWidth,TInt& aAscent,TInt& aDescent) const; |
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void Justify(TInt aExtraSpace); |
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void WriteInlineTextL(CTmFormatContext& aContext, CTmCode& aCode, TInt aPos, TInt aInlineWidth, TBool aLeadingEdge, TInt aInlineFormat); |
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159 |
|
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CTmBuffer<TText> iText; // the text of the line |
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CTmBuffer<TText> iTextWithoutChunkOverlaps; // the text of the line without any duplicate overlapping characters, used for determining line-breaks |
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CTmBuffer<TTmChunk> iChunk; // the chunks of text |
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CTmBuffer<TBidirectionalState::TRunInfo> iRunInfo; // information about the bidirectionally reordered text |
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164 |
|
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TInt iCountedEndChar; // line end, including only characters that fit the measure |
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TInt iHangingEndChar; // line end, including visible characters outside the measure if any |
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// (hanging characters): >= iCountedEndChar |
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TInt iEndChar; // line end, including everything except text after a truncation with ellipsis: |
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// >= iHangingEndChar |
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TInt iNextLineStartChar; // start of the next line; after undrawn characters if any; >= iEndChar |
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TBool iAtParEnd; // true if the line is at the end of a paragraph |
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TBool iBordered; // true if the line has border rules |
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TInt iHeight; // height of the line's outer bounds; the horizontal slice of the band |
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// occupied by this line |
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TRect iInnerBounds; // bounds not including indents or space above and below the line or paragraph, |
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// relative to 0,0 as the origin of the outer bounds |
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TInt iAscent; // distance between baseline and top of inner bounds |
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TChar iEllipsis; // if not 0xFFFF, append this ellipsis character |
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TInt iEllipsisFormat; // index of character position that provides ellipsis format |
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TInt iEllipsisWidth; // width of ellipsis if any |
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181 |
|
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// Context characters: These one character context data members are used by the rendering code in GDI |
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// to render punctuation marks based on the context. The context here represents the script in which to render the punctuation. |
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TUint iContextChar; // One character of context stored per line to be used by the first chunk of the next line |
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// as context. At the end of the formatting of the current line, this context is stored in CTmTextLayout |
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// so that the next line to be formatted can acquire this context. See CTmFormatContext::FormatL() |
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}; |
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188 |
|
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/** |
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Context used during formatting. |
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191 |
|
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192 |
@internalComponent |
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*/ |
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NONSHARABLE_CLASS(CTmFormatContext) : public CBase |
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{ |
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196 |
public: |
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197 |
/** |
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Information returned by FormatL. |
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@internalComponent |
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*/ |
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class TInfo |
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{ |
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public: |
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TInt iWidth; // actual width of formatted lines |
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TInt iHeight; // actual height of formatted lines |
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TInt iFirstLineEndChar; |
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TInt iLastLineStartChar; |
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TInt iEndChar; |
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// Context characters: These one character context data members are used by the rendering code in GDI |
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// to render punctuation marks based on the context. The context here represents the script in which to render the punctuation. |
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TUint iContextCharPerLine; // Temporary storage of one context character that represents the context for the last |
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// line. Set from TTmByteCodeFinder::TInfo when found in the byte code and used when |
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// formatting the current line. See CTmReformat::GenerateNewCodeL() and CTmFormatContext::FormatL() |
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}; |
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static void FormatL(MTmSource& aSource,const TTmFormatParam& aFormatParam,CTmCode& aCode,TInfo& aInfo, |
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CTmTextLayout* aTextLayout, const TBidirectionalContext* aStartBdState = 0, |
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TBidirectionalContext* aEndBdState = 0, |
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TBidirectionalEndOfLineContext* aStartBdContext = 0); |
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MGraphicsDeviceMap& Device() { return iTextCache.Device(); } |
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/** |
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It is not generally useful to construct this: Use the static FormatL() |
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instead. |
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@internalComponent |
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*/ |
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CTmFormatContext(MTmSource& aSource,const TTmFormatParam& aFormatParam,CTmCode& aCode,CTmTextLayout* aTextLayout, |
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const TBidirectionalContext* aBdContext = NULL); |
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~CTmFormatContext(); |
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private: |
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void FormatL(); |
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void SetParagraphMetricsL(); |
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void ResolveParagraphDirectionality(); |
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public: |
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MTmSource& iSource; // source of text and text attributes |
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// Scaling parameters are used when formatting for one device and displaying |
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// on another to produce a what-you-see-is-what-you-get ('wysiwyg') effect: |
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TInt iXScale; // amount by which to scale horizontal pixels in 1000ths |
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TInt iYScale; // amount by which to scale vertical pixels in 1000ths |
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const TTmFormatParam& iParam; // formatting parameters |
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RTmTextCache iTextCache; // gets the text and its format |
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TBidirectionalState iBdState; // the current bidirectional reordering state |
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TBidirectionalEndOfLineContext iBdEndOfLine; |
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TInt iDocumentLength; // the document length |
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TInt iActualEndChar; // the minimum of the document length plus one |
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// (to include the final paragraph delimiter) and iParam.iEndChar |
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CTmCode& iCode; // destination for the bytecode |
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CTmLine iLine; // the current line |
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TInt iLineInPar; // line number in the paragraph |
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TInfo iInfo; // information returned by the static FormatL function |
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// Returned by CTmLine::BreakL |
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TBool iLineEndsInForcedLineBreak; |
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// the current paragraph format and pixel versions of dimensions from it. |
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RTmParFormat iParFormat; |
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TInt iLeftMargin; |
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TInt iRightMargin; |
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TInt iFirstLineLeftMargin; |
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TInt iFirstLineRightMargin; |
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TInt iLineSpacing; |
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TBool iExactLineSpacing; |
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TInt iSpaceBefore; |
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TInt iSpaceAfter; |
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TInt iHBorderMargin; |
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TInt iVBorderMargin; |
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TInt iLeftBorder; |
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TInt iRightBorder; |
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TInt iTopBorder; |
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TInt iBottomBorder; |
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TInt iBulletAscent; |
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TInt iBulletDescent; |
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CTmTextLayout* iTextLayout; |
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}; |
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#endif |