textrendering/texthandling/inc/TXTFMLYR.H
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 02:02:46 +0200
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/*
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* Copyright (c) 1997-2009 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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*/
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#ifndef __TXTFMLYR_H__
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#define __TXTFMLYR_H__
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#include <e32std.h>
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#include <e32base.h>
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#include <txtfmstm.h>
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#include <txtfrmat.h>
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// forward declarations
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class CFormatStream;  
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class RReadStream;
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class RWriteStream;
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class TCharFormatX;
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#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS
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#include <txtfmlyr_internal.h>
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#endif
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/** 
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Abstract base class for the paragraph and character format layers.
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A format layer is a set of character or paragraph format attributes which 
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may own a pointer to another format layer. This pointer is called a based-on 
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link. The effective formatting of a text object may be built up from a chain 
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of format layers - the final layer in the chain has a NULL based-on link. 
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In case of conflict, attribute values set in upper layers (layers furthest 
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from the layer with the NULL based-on link) override those set in lower layers. 
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In rich text, additional formatting may be applied on top of these format 
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layers.
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The system of based-on links is implemented by the CFormatLayer class. It 
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also implements persistence for chains of format layers.
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When setting or sensing the attributes of a CParaFormatLayer or CCharFormatLayer, 
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a format mask and container are specified as parameters. The container has 
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data members for every format attribute, which may be set independently. When 
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setting the layer, the mask indicates the attributes which will be taken from 
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the container. Any attributes not specified in the mask will be taken from 
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the system-provided default values.
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When sensing a layer, on return, the mask indicates which attributes have 
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been explicitly set in the layer, (i.e. not taken from the default values). 
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In addition, a layer's effective format may be sensed. In this case, no 
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mask is used because the format container will, on return, contain a value 
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for every attribute. 
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@publishedAll
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@released
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*/
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class CFormatLayer : public CBase
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	{
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public:
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	//
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	// Based-on link utilities
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	IMPORT_C void Reset();  // Remove all contents of this layer in a leave safe manner.
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	IMPORT_C void SetBase(const CFormatLayer* aBaseFormatLayer);  // Set this layer to be based on the specified layer.
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	IMPORT_C const CFormatLayer* SenseBase()const;
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	IMPORT_C TInt ChainCount()const;  // Returns the number of format layers in the chain, inclusive of itself.
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	//
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	// Persistence
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	/** Implementations of this function internalise the format layer but not its based-on 
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	link from a read stream. The presence of this function means that the standard 
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	templated operator>>() (defined in s32strm.h) is available to internalise 
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	objects of the derived class. The internalised layer is set to be based on 
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	the layer specified.
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	@param aStream Stream from which the format layer should be internalised. 
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	@param aBase The based-on link to assign to the layer. By default, NULL. */
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	virtual void InternalizeL(RReadStream& aStream,const CFormatLayer* aBase=NULL)=0;
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	/** Implementations of this function externalise the format layer but not its based-on 
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	link to a write stream. The presence of this function means that the standard 
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	templatedoperator<<() (defined in s32strm.h) is available to externalise objects 
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	of the derived class.
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	@param aStream Stream to which the format layer should be externalised. */
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	virtual void ExternalizeL(RWriteStream& aStream)const=0;
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	//
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	//	Restore a format chain where the end of the chain is based on aBase (where aBase may be null).
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	IMPORT_C void InternalizeChainL(RReadStream& aStream,const CFormatLayer* aBase=NULL);
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	//	Stores a format layer chain of length length-aExcludeCount (or by default the whole chain).
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	IMPORT_C void ExternalizeChainL(RWriteStream& aStream,TInt aExcludeCount=0)const;
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	/** Implementations of this function compare another format layer with the current 
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	object. For the two layers to be equal, they must have the same contents and 
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	(if the second parameter is ETrue), their based-on links must point to the 
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	same format layer.
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	@param aLayer The layer to compare to this format layer. 
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	@param aCheckBasedOnLink If ETrue, both layers' based-on links must point to 
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	the same format layer. If EFalse, the based-on links are not used in the comparison. 
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	By default, ETrue. 
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	@return ETrue if the two layers are identical, otherwise EFalse. */
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	virtual TBool IsIdentical(CFormatLayer* aLayer,TBool aCheckBasedOnLink=ETrue)const=0;
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	IMPORT_C TBool IsEmpty()const;
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	void Swap(CFormatLayer& aLayer);
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private:
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	CFormatLayer(const CFormatLayer& aFormatLayer);
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	CFormatLayer& operator=(const CFormatLayer& aFormatLayer);
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	virtual CFormatLayer* DoCloneL()const=0;
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protected:
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	CFormatLayer();
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	~CFormatLayer();
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	virtual CFormatLayer* RestoreNewL(RReadStream& aStream)=0;
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	void ExternalizeLayersRecurseL(RWriteStream& aStream,TInt aDescendantCount)const;
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	TBool IsIdentical(const TUint8* aPtr,TInt aSize)const;
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	const TUint8* Ptr(TInt& aSize)const;
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	void CloneLayerL(CFormatLayer* aClone)const;
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protected:
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	RFormatStream iStore;
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	const CFormatLayer* iBasedOn;  // If non-null used to inherit format attributes from the lower layer.
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	__DECLARE_TEST;
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	};
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/** 
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A paragraph format layer. 
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Has a pointer (stored in its base class CFormatLayer) to another paragraph 
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format layer which may be NULL. This pointer is referred to as the based-on 
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link. A paragraph format layer is owned by an instance of the CGlobalText 
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class and stores the object's global paragraph formatting. Implements persistence 
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and allows attributes to be set and sensed. 
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@publishedAll
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@released
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*/
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class CParaFormatLayer : public CFormatLayer
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	{
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public:
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	IMPORT_C static CParaFormatLayer* NewL();
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	IMPORT_C static CParaFormatLayer* NewL(const CParaFormat* aParaFormat,const TParaFormatMask& aMask);
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	IMPORT_C static CParaFormatLayer* NewL(RReadStream& aStream);
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	static CParaFormatLayer* NewL(const CParaFormatLayer* aLayer);
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	static CParaFormatLayer* NewCopyBaseL(const CParaFormatLayer* aLayer);
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	// Create a new instance, restoring it from the specified stream.
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	// The based on link is NULL. Restores only one layer.
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	//
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	// Persistence
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	IMPORT_C virtual void InternalizeL(RReadStream& aStream,const CFormatLayer* aBase=NULL);	
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	IMPORT_C virtual void ExternalizeL(RWriteStream& aStream)const;
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	//
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	// Core methods
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	IMPORT_C void SetL(const CParaFormat* aDesiredEffectiveFormat,const TParaFormatMask& aMask);
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	IMPORT_C void SenseEffectiveL(CParaFormat* aParaFormat,CParaFormat::TParaFormatGetMode aMode=CParaFormat::EAllAttributes)const;
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	IMPORT_C void SenseL(CParaFormat* aParaFormat,TParaFormatMask& aMask,CParaFormat::TParaFormatGetMode aMode=CParaFormat::EAllAttributes)const;
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	//
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	// Utilities
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	inline CParaFormatLayer* CloneL()const;
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	IMPORT_C TBool IsIdenticalL(const CParaFormat* aParaFormat,const TParaFormatMask& aMask)const;
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	IMPORT_C virtual TBool IsIdentical(CFormatLayer* aLayer,TBool aCheckBasedOnLink=ETrue)const;
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	IMPORT_C virtual TUid Type()const;
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	IMPORT_C const TUint8* Ptr(TInt& aSize)const;
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private:
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	//
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	// No implementation provided
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	CParaFormatLayer(const CParaFormatLayer& aParaFormatLayer);
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	CParaFormatLayer& operator=(const CParaFormatLayer& aParaFormatLayer);
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	IMPORT_C virtual CFormatLayer* DoCloneL()const;
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	void FillParaFormatL(CParaFormat* aParaFormat,TParaFormatMask& aMask,CParaFormat::TParaFormatGetMode aMode)const;
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	void CleanupEffectiveFormat(CParaFormat* aParaFormat,TParaFormatMask aMask)const;
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	void CleanupBorders(CParaFormat* aParaFormat)const;
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protected:
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	CParaFormatLayer();
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	virtual CFormatLayer* RestoreNewL(RReadStream& aStream);
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	};
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/** 
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Character format layer.
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Uses a pointer (stored in its base class CFormatLayer) to another character 
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format layer which may be NULL. This pointer is referred to as the based-on 
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link. A character format layer is owned by an instance of the CGlobalText 
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class and stores the object's global character formatting. Implements persistence 
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and allows attributes to be set and sensed. 
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@publishedAll
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@released
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*/
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class CCharFormatLayer : public CFormatLayer
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	{
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public:
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	IMPORT_C static CCharFormatLayer* NewL();
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	IMPORT_C static CCharFormatLayer* NewL(const TCharFormat& aFormat,const TCharFormatMask& aMask);
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	IMPORT_C static CCharFormatLayer* NewL(RReadStream& aStream);
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	IMPORT_C virtual void InternalizeL(RReadStream& aStream,const CFormatLayer* aBase=NULL);	
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	IMPORT_C virtual void ExternalizeL(RWriteStream& aStream)const;
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	IMPORT_C void SetL(const TCharFormat& aCharFormat,const TCharFormatMask& aMask);
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	IMPORT_C void SenseEffective(TCharFormat& aCharFormat)const;
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	IMPORT_C void Sense(TCharFormat& aCharFormat,TCharFormatMask& aMask)const;
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	inline CCharFormatLayer* CloneL()const;
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	IMPORT_C virtual TBool IsIdentical(CFormatLayer* aLayer,TBool aCheckBasedOnLink=ETrue)const;
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	IMPORT_C TBool IsIdentical(const TCharFormat& aCharFormat,const TCharFormatMask& aMask)const;
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	IMPORT_C const TUint8* Ptr(TInt& aSize)const;
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	// non-exported public functions
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	static CCharFormatLayer* NewL(const CCharFormatLayer* aLayer);
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	static CCharFormatLayer* NewCopyBaseL(const CCharFormatLayer* aLayer);
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	static CCharFormatLayer* NewL(const TCharFormatX& aFormat,const TCharFormatXMask& aMask);
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	void SetL(const TCharFormatX& aCharFormat,const TCharFormatXMask& aMask);
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	void SenseEffective(TCharFormatX& aCharFormat)const;
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	void Sense(TCharFormatX& aCharFormat,TCharFormatXMask& aMask) const;
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private:
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	CCharFormatLayer();
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	virtual CFormatLayer* RestoreNewL(RReadStream& aStream);
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	virtual void FillCharFormat(TCharFormatX& aCharFormat,TCharFormatXMask& aMask)const;
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	IMPORT_C virtual CFormatLayer* DoCloneL()const;
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	};
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#include <txtfmlyr.inl>
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#endif