288 lines
9.1 KiB
C
288 lines
9.1 KiB
C
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/*
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* @doc INTERNAL
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*
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* @module _DOC.H CTxtStory declaration |
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*
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* Purpose:
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* Encapsulate the plain-text document data (text blocks, cchText)
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*
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* Original Authors: <nl>
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* Christian Fortini <nl>
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* Murray Sargent <nl>
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*
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* History: <nl>
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* 6/25/95 alexgo commented and cleaned up
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*
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*/
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#ifndef _DOC_H
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#define _DOC_H
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#include "_array.h"
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#define cbBlockCombine CbOfCch(3072)
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#define cbBlockMost CbOfCch(49152)
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#define cbBlockInitial CbOfCch(4096)
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#define cchGapInitial 128
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#define cchBlkCombmGapI (CchOfCb(cbBlockCombine) - cchGapInitial)
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#define cchBlkInitmGapI (CchOfCb(cbBlockInitial) - cchGapInitial)
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#define cchBlkInsertmGapI (CchOfCb(cbBlockInitial)*5 - cchGapInitial)
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class CDisplay;
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class CTxtPtr;
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class CTxtArray;
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/*
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* CTxtRun
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*
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* @class Formalizes a run of text. A range of text with same attribute,
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* (see CFmtDesc) or within the same line (see CLine), etc. Runs are kept
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* in arrays (see CArray) and are pointed to by CRunPtr's of various kinds.
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* In general the character position of a run is computed by summing the
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* length of all preceding runs, altho it may be possible to start from
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* some other cp, e.g., for CLines, from CDisplay::_cpFirstVisible.
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*/
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class CTxtRun
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{
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//@access Public Methods and Data
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public:
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CTxtRun() {_cch = 0;} //@cmember Constructor
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LONG _cch; //@cmember Count of characters in run
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};
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/*
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* CTxtBlk
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*
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* @class A text block; a chunk of UNICODE text with a buffer gap to allow
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* for easy insertions and deletions.
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*
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* @base protected | CTxtRun
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*
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* @devnote A text block may have four states: <nl>
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* NULL: No data allocated for the block <nl>
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* <md CTxtBlk::_pch> == NULL <nl>
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* <md CTxtRun::_cch> == 0 <nl>
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* <md CTxtBlk::_ibGap> == 0 <nl>
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* <md CTxtBlk::_cbBlock> == 0 <nl>
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*
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* empty: All of the available space is a buffer gap <nl>
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* <md CTxtBlk::_pch> != NULL <nl>
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* <md CTxtRun::_cch> == 0 <nl>
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* <md CTxtBlk::_ibGap> == 0 <nl>
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* <md CTxtBlk::_cbBlock> <gt>= 0 <nl>
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*
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* normal: There is both data and a buffer gap <nl>
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* <md CTxtBlk::_pch> != NULL <nl>
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* <md CTxtRun::_cch> != 0 <nl>
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* <md CTxtBlk::_ibGap> != 0 <nl>
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* <md CTxtBlk::_cbBlock> <gt>= 0 <nl>
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*
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* full: The buffer gap is of zero size <nl>
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* <md CTxtBlk::_pch> != NULL <nl>
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* <md CTxtRun::_cch> <gt>= 0 <nl>
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* <md CTxtBlk::_ibGap> <gt> 0 <nl>
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* <md CTxtBlk::_cbBlock> == _cch * sizeof(WCHAR) <nl>
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*
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* The position of the buffer gap is given by _ibGap. With _cch and _cbBlock,
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* it's possible to figure out the *size* of the gap by simply calculating:
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* <nl>
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* size = _cbBlock - (_cch * sizeof(character))
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*
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*/
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class CTxtBlk : public CTxtRun
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{
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friend class CTxtPtr;
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friend class CTxtArray;
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//@access Protected Methods
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protected:
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//@cmember Constructor
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CTxtBlk() {InitBlock(0);}
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//@cmember Destructor
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~CTxtBlk() {FreeBlock();}
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//@cmember Initializes the block to the
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//# of bytes given by <p cb>
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BOOL InitBlock(LONG cb);
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//@cmember Sets a block to the NULL state
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VOID FreeBlock();
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//@cmember Moves the buffer gap in a
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//block
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VOID MoveGap(LONG ichGap);
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//@cmember Resizes a block to <p cbNew>
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//bytes
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BOOL ResizeBlock(LONG cbNew);
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//@access Private Data
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private:
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//@cmember Pointer to the text data
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WCHAR *_pch;
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//@cmember BYTE offset of the gap
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LONG _ibGap;
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//@cmember size of the block in bytes
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LONG _cbBlock;
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};
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/*
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* CTxtArray
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*
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* @class A dynamic array of <c CTxtBlk> classes
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*
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* @base public | CArray<lt>CTxtBlk<gt>
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*/
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class CTxtArray : public CArray<CTxtBlk>
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{
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friend class CTxtPtr;
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friend class CTxtStory;
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//@access Public methods
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public:
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#ifdef DEBUG
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//@cmember Invariant support
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BOOL Invariant() const;
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#endif // DEBUG
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//@cmember Constructor
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CTxtArray();
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//@cmember Destructor
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~CTxtArray();
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//@cmember Gets the total number of
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//characters in the array.
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LONG CalcTextLength() const;
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// Get access to cached CCharFormat and CParaFormat structures
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const CCharFormat* GetCharFormat(LONG iCF);
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const CParaFormat* GetParaFormat(LONG iPF);
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LONG Get_iCF() {return _iCF;}
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LONG Get_iPF() {return _iPF;}
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void Set_iCF(LONG iCF) {_iCF = (SHORT)iCF;}
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void Set_iPF(LONG iPF) {_iPF = (SHORT)iPF;}
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//@access Private methods
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private:
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//@cmember Adds cb blocks
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BOOL AddBlock(LONG itbNew, LONG cb);
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//@cmember Removes ctbDel blocks
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void RemoveBlocks(LONG itbFirst, LONG ctbDel);
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//@cmember Combines blocks adjacent to itb
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void CombineBlocks(LONG itb);
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//@cmember Splits a block
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BOOL SplitBlock(LONG itb, LONG ichSplit, LONG cchFirst,
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LONG cchLast, BOOL fStreaming);
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//@cmember Shrinks all blocks to minimal
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// size
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void ShrinkBlocks();
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//@cmember Copies chunk of text into
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// location given
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LONG GetChunk(TCHAR **ppch, LONG cch, TCHAR *pchChunk, LONG cchCopy) const;
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LONG _cchText; //@cmember Total text character count
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SHORT _iCF; //@cmember Default CCharFormat index
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SHORT _iPF;
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};
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class CBiDiLevel
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{
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public:
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BOOL operator == (const CBiDiLevel& level) const
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{
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return _value == level._value && _fStart == level._fStart;
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}
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BOOL operator != (const CBiDiLevel& level) const
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{
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return _value != level._value || _fStart != level._fStart;
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}
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BYTE _value; // embedding level (0..15)
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BYTE _fStart :1; // start a new level e.g. "{{abc}{123}}"
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};
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/*
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* CFormatRun
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*
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* @class A run of like formatted text, where the format is indicated by an
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* and index into a format table
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*
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* @base protected | CTxtRun
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*/
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class CFormatRun : public CTxtRun
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{
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//@access Public Methods
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public:
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friend class CFormatRunPtr;
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friend class CTxtRange;
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friend class CRchTxtPtr;
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BOOL SameFormat(CFormatRun* pRun)
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{
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return _iFormat == pRun->_iFormat &&
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_level._value == pRun->_level._value &&
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_level._fStart == pRun->_level._fStart;
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}
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short _iFormat; //@cmember index of CHARFORMAT/PARAFORMAT struct
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CBiDiLevel _level; //@cmember BiDi level
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};
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//@type CFormatRuns | An array of CFormatRun classes
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typedef CArray<CFormatRun> CFormatRuns;
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/*
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* CTxtStory
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*
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* @class
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* The text "Document". Maintains the state information related to the
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* actual data of a document (such as text, formatting information, etc.)
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*/
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class CTxtStory
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{
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friend class CTxtPtr;
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friend class CRchTxtPtr;
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friend class CReplaceFormattingAE;
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//@access Public Methods
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public:
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CTxtStory(); //@cmember Constructor
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~CTxtStory(); //@cmember Destructor
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//@cmember Get total text length
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LONG GetTextLength() const
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{return _TxtArray._cchText;}
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//@cmember Get Paragraph Formatting runs
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CFormatRuns *GetPFRuns() {return _pPFRuns;}
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//@cmember Get Character Formatting runs
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CFormatRuns *GetCFRuns() {return _pCFRuns;}
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void DeleteFormatRuns(); //@cmember Converts to plain text from rich
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const CCharFormat* GetCharFormat(LONG iCF)
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{return _TxtArray.GetCharFormat(iCF);}
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const CParaFormat* GetParaFormat(LONG iPF)
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{return _TxtArray.GetParaFormat(iPF);}
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LONG Get_iCF() {return _TxtArray.Get_iCF();}
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LONG Get_iPF() {return _TxtArray.Get_iPF();}
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void Set_iCF(LONG iCF) {_TxtArray.Set_iCF(iCF);}
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void Set_iPF(LONG iPF) {_TxtArray.Set_iPF(iPF);}
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#ifdef DEBUG
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void DbgDumpStory(void); // Debug story dump member
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#endif
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//@access Private Data
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private:
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CTxtArray _TxtArray; //@cmember Plain-text runs
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CFormatRuns * _pCFRuns; //@cmember Ptr to Character-Formatting runs
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CFormatRuns * _pPFRuns; //@cmember Ptr to Paragraph-Formatting runs
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};
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#endif // ifndef _DOC_H
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