author | William Roberts <williamr@symbian.org> |
Tue, 16 Mar 2010 16:12:26 +0000 | |
branch | Symbian2 |
changeset 2 | 2fe1408b6811 |
parent 0 | 061f57f2323e |
child 4 | 837f303aceeb |
permissions | -rw-r--r-- |
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// Copyright (c) 2003-2009 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.symbianfoundation.org/legal/licencesv10.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 __TXTLAYDC_H__ |
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#define __TXTLAYDC_H__ |
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#include <e32std.h> |
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class CParaFormat; |
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class TCharFormat; |
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class CPicture; |
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class MLayDoc |
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/** |
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Specifies the interface for providing the information needed by the text |
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layout engine to lay out a text object. |
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Examples of derived classes are CRichText and CGlobalText. |
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At the heart of the interface are two interrogation functions; one gives the |
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paragraph formatting for a document position, and the other gives a pointer |
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descriptor to a series of contiguous characters with identical character |
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formatting, and their character formatting. This information is sufficient |
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for the layout engine to find the formatting and content of an entire document. |
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The constructor for the layout engine (CTextLayout) is prototyped as: |
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static CTextLayout *NewL(MLayDoc *aDoc,TInt aWrapWidth); |
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By viewing the text object purely in terms of the MLayDoc interface, the layout |
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engine is insulated from any editable text implementation issues. |
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@see static CTextLayout *NewL(MLayDoc *aDoc,TInt aWrapWidth) |
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@publishedAll |
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@released |
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*/ |
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{ |
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// Defines interface for extracting content & format information from text source. |
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// Designed to be 'mixed-in' with other classes. |
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// |
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public: |
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/** Used as a parameter to the PictureHandleL() function to control whether |
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picture data should be loaded into memory or not. */ |
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enum TForcePictureLoad |
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{ |
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/** Do not load the picture data into memory. */ |
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EForceLoadFalse, |
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/** Load the picture data into memory. */ |
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EForceLoadTrue |
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}; |
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public: |
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/** Gets the the number of characters in the document. |
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@return The number of characters contained in the document. */ |
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virtual TInt LdDocumentLength()const=0; // Does not include final document terminator |
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/** Gets the document position of the start of the paragraph containing a |
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specified position. |
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@param aCurrentPos A valid document position. On return contains the |
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document position of the first character in the paragraph. |
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@return The number of characters skipped in scanning to the start of the |
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paragraph. */ |
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virtual TInt LdToParagraphStart(TInt& aCurrentPos)const=0; |
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/** Gets the effective paragraph formatting which applies to the paragraph |
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which contains a specified document position. On return, aFormat is filled |
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with values for all paragraph format attributes. |
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@param aFormat On return, filled with the paragraph's effective paragraph |
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formatting. |
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@param aPos Any document position within the paragraph of interest. */ |
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virtual void GetParagraphFormatL(CParaFormat* aFormat,TInt aPos)const=0; |
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/** Gets a constant pointer descriptor to a portion of the text object with |
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constant character formatting. The view starts at the document position |
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specified, and ends at: |
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the last character which shares the same character formatting (rich text |
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only), or |
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the end of the document, or |
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the end of the segment, if segmented storage is being used |
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whichever occurs first. |
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Also fills a character format object with the character formatting of the |
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range of characters. |
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@param aView On return, a constant pointer to a portion of the text. |
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@param aFormat On return, contains the character formatting of the text. |
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@param aStartPos The start position for the view. Must be a valid document |
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position, or a panic occurs. */ |
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virtual void GetChars(TPtrC& aView,TCharFormat& aFormat,TInt aStartPos)const=0; |
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/** Gets the size of a picture located at a specified document position. |
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Note: The global text implementation of this function always returns |
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KErrNotFound because global text does not support pictures. |
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@param aSize On return, contains the size of the picture located at aPos. |
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@param aPos Document position of the picture. |
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@return KErrNotFound if there is no picture at the specified document |
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position, KErrNone if there is. */ |
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virtual TInt GetPictureSizeInTwips(TSize& aSize, TInt aPos)const=0; |
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119 |
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/** Gets a pointer to the picture located at a specified document position, |
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if one exists. If the picture is not in memory, the function loads it (if |
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the second argument has a value of EForceLoadTrue). |
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123 |
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Note: The global text implementation of this function always returns NULL |
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because global text does not support pictures. |
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126 |
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@param aPos Document position of the picture character. |
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@param aForceLoad If the picture is not loaded into memory, EForceLoadTrue |
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loads it using the picture factory; EForceLoadFalse does not, and in this |
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case, the function returns NULL. |
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@return A pointer to the picture located at aPos. NULL if aPos does not |
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specify a picture character, or if there is a picture at aPos which is not |
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in memory, and the second argument is EForceLoadFalse. */ |
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virtual CPicture* PictureHandleL(TInt aPos,TForcePictureLoad aForceLoad=EForceLoadTrue)const=0; |
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135 |
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/** Tests whether a page break occurs within a range of characters. A page |
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table should have been set up first: see CPlainText::SetPageTable(). |
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138 |
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@param aPos The document position from which to begin searching for a page |
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break. |
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@param aLength The number of characters to search for a page break, |
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beginning at aPos. The default is zero. |
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@return ETrue if a page break occurs within the specified range, otherwise |
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EFalse. */ |
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virtual TBool EnquirePageBreak(TInt aPos,TInt aLength=0)const=0; |
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146 |
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/** This function should be implemented by text objects which support |
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paragraph labels. Each paragraph may have at most one label. By default, |
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the functions provided by MLayDoc apply to the main body of text. This |
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function is provided to change this so that the MLayDoc object is an |
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individual paragraph label, (each of which is treated as a separate |
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document). Paragraph labelling has not been implemented by global or rich |
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153 |
text. |
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154 |
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This function should select the paragraph label associated with the |
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paragraph containing document position aPos (aPos is a document position |
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157 |
in the main document). |
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158 |
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@param aPos A document position within a paragraph. This paragraph's label |
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should be set as the main MLayDoc document. |
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@return Should return EFalse if the paragraph has no label, in which case |
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the function has no effect, ETrue otherwise. */ |
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virtual TBool SelectParagraphLabel(TInt aPos)=0; |
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164 |
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/** Cancels a paragraph label selection made by a call to |
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SelectParagraphLabel() so that the main document reverts back to the main |
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body of text. */ |
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virtual void CancelSelectLabel()=0; |
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169 |
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/** |
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@internalAll |
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@prototype |
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*/ |
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IMPORT_C virtual void MLayDoc_Reserved_1(); |
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}; |
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#endif |