graphicsdeviceinterface/gdi/inc/BidiText.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 02 Sep 2010 21:50:40 +0300
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// Copyright (c) 2002-2009 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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//
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#ifndef BIDITEXT_H_
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#define BIDITEXT_H_
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#include <e32std.h>
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#include <gdi.h>
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#include <bidi.h> // class TBidirectionalState::TRunInfo
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enum CGraphicsContext::TTextAlign;
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class MLineBreaker;
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class RRunInfoArray;
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class CBidiTextTls;
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/**
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This enumeration holds the possible panic codes that may be raised 
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by the BidiText API on detecting an unrecoverable error.
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@publishedAll
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@released
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*/
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enum TBidiPanic
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	{
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	/** The call to RRunInfoArray::OpenL() has not been made prior to this call to TBidiText::SetText()
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	@see TBidiText::SetText	*/
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	EBidiPanic_RunArrayNull						= 0,
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	/** Maximum number of lines that the text will need to be split into is invalid i.e less than zero or negative.
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	@see TBidiText::NewL
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	@see TBidiText::MinimumSize	*/
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	EBidiPanic_InvalidMaxline					= 1,
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	/** Maximum number of characters are invalid i.e less than zero or negative.
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	@see TBidiText::NewL */
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	EBidiPanic_InvalidReservedMaxLength			= 2,
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	/** Maximum width of the text in pixels is invalid i.e zero or negative.
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	@see TBidiText::MinimumSize */
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	EBidiPanic_InvalidWrappingWidth				= 3,
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	/** Number of empty pixels between two lines of text are invalid i.e zero or negative.
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	@see TBidiText::MinimumSize */
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	EBidiPanic_InvalidLineGap					= 4,
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	/** Text length for display is invalid i.e zero or negative.
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	@see TBidiText::DisplayText
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	@see TBidiText::LineOfDisplayText */
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	EBidiPanic_InvalidVisualOrderedTextLength	= 5,
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	/** Line number to retrieve is invalid i.e zero or negative. 
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	@see TBidiText::LineOfDisplayText */
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	EBidiPanic_InvalidLineNumber				= 6
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	};
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/** 
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This class works as a replacement for HBufC in those cases where a small 
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amount of text is being formatted simply. The text must be all of one style 
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and broken into lines of all the same length. The number of lines and the text 
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itself is specified on construction, and the text may then be re-broken, 
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re-truncated and re-drawn with non-leaving functions. 
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@publishedAll
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@released
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*/
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class TBidiText
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	{
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public:
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	/** Overall directionality of the text. */
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	enum TDirectionality
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		{
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		/** Text reading begins on the left. */
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		ELeftToRight = 0,
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		/** Text reading begins on the right. */
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		ERightToLeft = 1
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		};
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	/** Class specific panic codes 
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	@deprecated This enum has been replaced by TBidiPanic.
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    */
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	enum TPanicCodes
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		{
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		EPanicRunArrayNull,
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		};
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	IMPORT_C static TDirectionality ScriptDirectionality(TLanguage aLanguage);
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	IMPORT_C static TDirectionality TextDirectionality(
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		const TDesC& aText, TBool* aFound = 0);
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protected:
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	TBidiText();
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public:
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	IMPORT_C static TBidiText* NewL(TInt aReservedMaxLength, TInt aMaxLines);
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	IMPORT_C static TBidiText* NewL(const TDesC& aText, TInt aMaxLines);
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	IMPORT_C static TBidiText* NewL(const TDesC& aText, TInt aMaxLines,
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		TDirectionality aDirectionality);
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	IMPORT_C TInt SetText(const TDesC& aText, RRunInfoArray& aRunInfoArray);
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	IMPORT_C TInt SetText(const TDesC& aText, TDirectionality aDirectionality, RRunInfoArray& aRunInfoArray);
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	IMPORT_C void SetTruncationChar(TChar aTruncateWith);
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	IMPORT_C void WrapText(TInt aWrappingWidth, const CFont& aFont,
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		const MLineBreaker* aBreaker, TInt aMaxLines);
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	IMPORT_C void WrapText(TInt aWrappingWidth, const CFont& aFont,
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		const MLineBreaker* aBreaker = NULL);
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	IMPORT_C TSize MinimumSize(TInt aWrappingWidth, const CFont& aFont, TInt aLineGap, TInt aMaxLines = -1,
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		const MLineBreaker* aBreaker = NULL) const;	
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	IMPORT_C TPtrC Text() const;
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	IMPORT_C TPtrC DisplayText() const;
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	IMPORT_C TInt WrappingWidth() const;
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	IMPORT_C TDirectionality Directionality() const;
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	IMPORT_C TChar TruncationChar() const;
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	IMPORT_C TInt NumberOfLinesInDisplayText() const;
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	IMPORT_C TPtrC LineOfDisplayText(TInt aLine, TInt& aWidthInPixels) const;
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	IMPORT_C void DrawText(CGraphicsContext& aGc, const TPoint& aLeft) const;
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	IMPORT_C void DrawText(CGraphicsContext& aGc,
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		const TPoint& aLeft, TInt aBaseLineSpacing,
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		CGraphicsContext::TTextAlign aAlignment) const;
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	IMPORT_C void DrawText(CGraphicsContext& aGc,
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		const TPoint& aLeft, TInt aBaseLineSpacing) const;
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private:
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	TInt DoWrapText(TInt aWrappingWidth, const CFont& aFont, const MLineBreaker* aBreaker, 
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		TInt aMaxLines, TText*& aOutputText, TInt& aNumLines, TInt16* aLineWidthArray) const;
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	};
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/**
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This class is used to keep track of the shared run info array. 
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Keep it open for as long as the TBidiText object is used. The same
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RRunInfoArray object can be used with several different TBidiText objects.
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@publishedAll
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@released
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*/
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class RRunInfoArray
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	{
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	friend class TBidiText;
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public:	
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	IMPORT_C RRunInfoArray();
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	IMPORT_C void OpenL();
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	IMPORT_C void Close();
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private:
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	TBidirectionalState::TRunInfo* RunArray() const;
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private:
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	CBidiTextTls* iTls;
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	};
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#endif