702 lines
15 KiB
C++
702 lines
15 KiB
C++
/*
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* @doc INTERNAL
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*
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* @module DOC.C CTxtStory and CTxtArray implementation |
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*
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* Original Authors: <nl>
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* Original RichEdit code: David R. Fulmer <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 Cleanup and reorganization
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*
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* Copyright (c) 1995-2000, Microsoft Corporation. All rights reserved.
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*/
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#include "_common.h"
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#include "_doc.h"
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#include "_format.h"
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ASSERTDATA
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// =========================== Invariant stuff ======================
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#define DEBUG_CLASSNAME CTxtArray
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#include "_invar.h"
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// ======================== CTxtArray class =========================
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#ifdef DEBUG
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/*
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* CTxtArray::Invariant
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*
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* @mfunc Tests CTxtArray's state
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*
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* @rdesc Returns TRUE always; failures are indicated by Asserts
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* Actually in this routine, we return count of chars in blocks
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* since we need this value for one check.
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*/
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BOOL CTxtArray::Invariant() const
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{
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static LONG numTests = 0;
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numTests++; // How many times we've been called.
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LONG cch = 0;
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LONG iMax = Count();
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if(iMax > 0)
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{
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CTxtBlk *ptb = Elem(0);
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// ptb shouldn't be NULL since we're within Count elements
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Assert(ptb);
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for(LONG i = 0; i < iMax; i++, ptb++)
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{
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LONG cchCurr = ptb->_cch;
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cch += cchCurr;
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Assert ( cchCurr >= 0 );
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Assert ( cchCurr <= CchOfCb(ptb->_cbBlock) );
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// While we're here, check range of interblock gaps
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Assert (ptb->_ibGap >= 0);
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Assert (ptb->_ibGap <= ptb->_cbBlock);
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LONG cchGap = CchOfCb(ptb->_ibGap);
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Assert ( cchGap >= 0 );
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Assert ( cchGap <= cchCurr );
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}
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}
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return cch;
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}
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#endif // DEBUG
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/*
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* CTxtArray::CTxtArray()
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*
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* @mfunc Text array constructor
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*/
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CTxtArray::CTxtArray() : CArray<CTxtBlk> ()
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::CTxtArray()");
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AssertSz(CchOfCb(cbBlockMost) - cchGapInitial >= cchBlkInitmGapI * 2,
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"cchBlockMax - cchGapInitial must be at least (cchBlockInitial - cchGapInitial) * 2");
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Assert(!_cchText && !_iCF && !_iPF);
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// Make sure we have no data to initialize
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Assert(sizeof(CTxtArray) == sizeof(CArray<CTxtBlk>) + sizeof(_cchText) + 2*sizeof(_iCF));
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}
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/*
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* CTxtArray::~CTxtArray
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*
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* @mfunc Text array destructor
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*/
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CTxtArray::~CTxtArray()
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::~CTxtArray");
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for(LONG itb = Count(); itb--; )
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{
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CTxtBlk *ptb = Elem(itb);
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if(ptb)
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ptb->FreeBlock();
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else
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AssertSz(FALSE, "CTxtArray::~CTxtArray: NULL block ptr");
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}
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}
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/*
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* CTxtArray::CalcTextLength()
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*
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* @mfunc Computes and return length of text in this text array
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*
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* @rdesc Count of character in this text array
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*
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* @devnote This call may be computationally expensive; we have to
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* sum up the character sizes of all of the text blocks in
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* the array.
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*/
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LONG CTxtArray::CalcTextLength() const
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::GetCch");
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_TEST_INVARIANT_
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LONG itb = Count();
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CTxtBlk *ptb = Elem(0);
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if(!itb || !ptb)
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return 0;
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for(LONG cch = 0; itb--; ptb++)
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cch += ptb->_cch;
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return cch;
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}
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/*
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* CTxtArray::AddBlock(itbNew, cb)
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*
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* @mfunc create new text block
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*
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* @rdesc
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* FALSE if block could not be added
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* non-FALSE otherwise
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*
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* @comm
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* Side Effects:
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* moves text block array
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*/
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BOOL CTxtArray::AddBlock(
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LONG itbNew, //@parm index of the new block
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LONG cb) //@parm size of new block; if <lt>= 0, default is used
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::AddBlock");
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_TEST_INVARIANT_
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if(cb <= 0)
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cb = cbBlockInitial;
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AssertSz(cb > 0, "CTxtArray::AddBlock() - adding block of size zero");
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AssertSz(cb <= cbBlockMost, "CTxtArray::AddBlock() - block too big");
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CTxtBlk *ptb = Insert(itbNew, 1);
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if(!ptb || !ptb->InitBlock(cb))
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{
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TRACEERRSZSC("TXTARRAT::AddBlock() - unable to allocate new block", E_OUTOFMEMORY);
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return FALSE;
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}
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return TRUE;
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}
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/*
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* CTxtArray::SplitBlock(itb, ichSplit, cchFirst, cchLast, fStreaming)
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*
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* @mfunc split a text block into two
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*
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* @rdesc
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* FALSE if the block could not be split <nl>
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* non-FALSE otherwise
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*
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* @comm
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* Side Effects: <nl>
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* moves text block array
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*/
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BOOL CTxtArray::SplitBlock(
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LONG itb, //@parm index of the block to split
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LONG ichSplit, //@parm character index within block at which to split
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LONG cchFirst, //@parm desired extra space in first block
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LONG cchLast, //@parm desired extra space in new block
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BOOL fStreaming) //@parm TRUE if streaming in new text
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::SplitBlock");
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_TEST_INVARIANT_
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AssertSz(ichSplit > 0 || cchFirst > 0,
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"CTxtArray::SplitBlock(): splitting at beginning, but not adding anything");
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AssertSz(itb >= 0, "CTxtArray::SplitBlock(): negative itb");
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// Compute size for first half
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AssertSz(cchFirst + ichSplit <= CchOfCb(cbBlockMost),
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"CTxtArray::SplitBlock(): first size too large");
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cchFirst += ichSplit + cchGapInitial;
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cchFirst = min(cchFirst, CchOfCb(cbBlockMost));
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// Compute size for second half
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CTxtBlk *ptb = Elem(itb);
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if(!ptb)
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{
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AssertSz(FALSE, "CTxtArray::SplitBlock: NULL block ptr");
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return FALSE;
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}
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AssertSz(cchLast + ptb->_cch - ichSplit <= CchOfCb(cbBlockMost),
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"CTxtArray::SplitBlock(): second size too large");
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cchLast += ptb->_cch - ichSplit + cchGapInitial;
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cchLast = min(cchLast, CchOfCb(cbBlockMost));
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// Allocate second block and move text to it
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// If streaming in, allocate a block that's as big as possible so that
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// subsequent additions of text are faster. We always fall back to
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// smaller allocations so this won't cause unnecessary errors. When
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// we're done streaming we compress blocks, so this won't leave a
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// big empty gap. NOTE: ***** moves rgtb *****
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if(fStreaming)
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{
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LONG cb = cbBlockMost;
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const LONG cbMin = CbOfCch(cchLast);
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while(cb >= cbMin && !AddBlock(itb + 1, cb))
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cb -= cbBlockCombine;
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if(cb >= cbMin)
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goto got_block;
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}
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if(!AddBlock(itb + 1, CbOfCch(cchLast)))
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{
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TRACEERRSZSC("CTxtArray::SplitBlock(): unabled to add new block", E_FAIL);
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return FALSE;
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}
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got_block:
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LPBYTE pbSrc;
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LPBYTE pbDst;
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CTxtBlk *ptb1 = Elem(itb+1);
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ptb = Elem(itb); // Recompute ptb and ptb1 after rgtb moves
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if(!ptb || !ptb1)
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{
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AssertSz(FALSE, "CTxtArray::SplitBlock: NULL block ptr");
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return FALSE;
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}
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ptb1->_cch = ptb->_cch - ichSplit;
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ptb1->_ibGap = 0;
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pbDst = (LPBYTE) (ptb1->_pch - ptb1->_cch) + ptb1->_cbBlock;
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ptb->MoveGap(ptb->_cch); // make sure pch points to a continuous block of all text in ptb.
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pbSrc = (LPBYTE) (ptb->_pch + ichSplit);
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CopyMemory(pbDst, pbSrc, CbOfCch(ptb1->_cch));
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ptb->_cch = ichSplit;
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ptb->_ibGap = CbOfCch(ichSplit);
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// Resize first block
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if(CbOfCch(cchFirst) != ptb->_cbBlock)
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{
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//$ FUTURE: don't resize unless growing or shrinking considerably
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if(!ptb->ResizeBlock(CbOfCch(cchFirst)))
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{
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TRACEERRSZSC("TXTARRA::SplitBlock(): unabled to resize block", E_OUTOFMEMORY);
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return FALSE;
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}
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}
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return TRUE;
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}
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/*
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* CTxtArray::ShrinkBlocks()
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*
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* @mfunc Shrink all blocks to their minimal size
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*/
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void CTxtArray::ShrinkBlocks()
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::ShrinkBlocks");
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_TEST_INVARIANT_
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for(LONG itb = Count(); itb--; )
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{
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CTxtBlk *ptb = Elem(itb);
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if(ptb)
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ptb->ResizeBlock(CbOfCch(ptb->_cch));
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else
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AssertSz(FALSE, "CTxtArray::ShrinkBlocks: NULL block ptr");
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}
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}
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/*
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* CTxtArray::RemoveBlocks(itbFirst, ctbDel)
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*
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* @mfunc remove a range of text blocks
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*
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* @comm Side Effects: <nl>
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* moves text block array
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*/
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void CTxtArray::RemoveBlocks(
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LONG itbFirst, //@parm Index of first block to remove
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LONG ctbDel) //@parm Count of blocks to remove
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::RemoveBlocks");
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_TEST_INVARIANT_
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LONG itb = itbFirst;
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AssertSz(itb + ctbDel <= Count(), "CTxtArray::RemoveBlocks(): not enough blocks");
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for(LONG ctb = ctbDel; ctb--; itb++)
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{
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CTxtBlk *ptb = Elem(itb);
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if(ptb)
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ptb->FreeBlock();
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else
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AssertSz(FALSE, "CTxtArray::RemoveBlocks: NULL block ptr");
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}
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Remove(itbFirst, ctbDel);
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}
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/*
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* CTxtArray::CombineBlocks(itb)
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*
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* @mfunc combine adjacent text blocks
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*
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* @rdesc
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* nothing
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*
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* @comm
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* Side Effects: <nl>
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* moves text block array
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*
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* @devnote
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* scans blocks from itb - 1 through itb + 1 trying to combine
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* adjacent blocks
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*/
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void CTxtArray::CombineBlocks(
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LONG itb) //@parm index of the first block modified
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::CombineBlocks");
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_TEST_INVARIANT_
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LONG ctb;
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LONG cbT;
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CTxtBlk *ptb, *ptb1;
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if(itb > 0)
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itb--;
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ctb = min(3, Count() - itb);
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if(ctb <= 1)
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return;
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for(; ctb > 1; ctb--)
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{
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ptb = Elem(itb); // Can we combine current
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ptb1 = Elem(itb+1); // and next blocks ?
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cbT = CbOfCch(ptb->_cch + ptb1->_cch + cchGapInitial);
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if(cbT <= cbBlockInitial)
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{ // Yes
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if(cbT != ptb->_cbBlock && !ptb->ResizeBlock(cbT))
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continue;
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ptb ->MoveGap(ptb->_cch); // Move gaps at ends of
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ptb1->MoveGap(ptb1->_cch); // both blocks
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CopyMemory(ptb->_pch + ptb->_cch, // Copy next block text
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ptb1->_pch, CbOfCch(ptb1->_cch)); // into current block
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ptb->_cch += ptb1->_cch;
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ptb->_ibGap += CbOfCch(ptb1->_cch);
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RemoveBlocks(itb+1, 1); // Remove next block
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}
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else
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itb++;
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}
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}
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/*
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* CTxtArray::GetChunk(ppch, cch, pchChunk, cchCopy)
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*
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* @mfunc
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* Get content of text chunk in this text array into a string
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*
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* @rdesc
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* remaining count of characters to get
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*/
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LONG CTxtArray::GetChunk(
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TCHAR **ppch, //@parm ptr to ptr to buffer to copy text chunk into
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LONG cch, //@parm length of pch buffer
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TCHAR *pchChunk, //@parm ptr to text chunk
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LONG cchCopy) const //@parm count of characters in chunk
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtArray::GetChunk");
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_TEST_INVARIANT_
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if(cch > 0 && cchCopy > 0)
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{
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if(cch < cchCopy)
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cchCopy = cch; // Copy less than full chunk
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CopyMemory(*ppch, pchChunk, cchCopy*sizeof(TCHAR));
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*ppch += cchCopy; // Adjust target buffer ptr
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cch -= cchCopy; // Fewer chars to copy
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}
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return cch; // Remaining count to copy
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}
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const CCharFormat* CTxtArray::GetCharFormat(LONG iCF)
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{
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TRACEBEGIN(TRCSUBSYSEDIT, TRCSCOPEINTERN, "CTxtArray::GetCharFormat");
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const CCharFormat * pCF;
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if(iCF < 0)
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iCF = _iCF;
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Assert(iCF >= 0);
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if(FAILED(GetCharFormatCache()->Deref(iCF, &pCF)))
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{
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AssertSz(FALSE, "CTxtArray::GetCharFormat: couldn't deref iCF");
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pCF = NULL;
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}
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return pCF;
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}
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const CParaFormat* CTxtArray::GetParaFormat(LONG iPF)
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{
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TRACEBEGIN(TRCSUBSYSEDIT, TRCSCOPEINTERN, "CTxtArray::GetParaFormat");
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const CParaFormat * pPF;
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if(iPF < 0)
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iPF = _iPF;
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Assert(iPF >= 0);
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if(FAILED(GetParaFormatCache()->Deref(iPF, &pPF)))
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{
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AssertSz(FALSE, "CTxtArray::GetParaFormat: couldn't deref iPF");
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pPF = NULL;
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}
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return pPF;
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}
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// ======================== CTxtBlk class =================================
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/*
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* CTxtBlk::InitBlock(cb)
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*
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* @mfunc
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* Initialize this text block
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*
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* @rdesc
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* TRUE if success, FALSE if allocation failed
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*/
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BOOL CTxtBlk::InitBlock(
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LONG cb) //@parm initial size of the text block
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtBlk::InitBlock");
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_pch = NULL;
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_cch = 0;
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_ibGap = 0;
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_cbBlock= cb;
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if(cb)
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_pch = (TCHAR*)PvAlloc(cb, GMEM_ZEROINIT);
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return _pch != 0;
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}
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/*
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* CTxtBlk::FreeBlock()
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*
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* @mfunc
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* Free this text block
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*/
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void CTxtBlk::FreeBlock()
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtBlk::FreeBlock");
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FreePv(_pch);
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_pch = NULL;
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_cch = 0;
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_ibGap = 0;
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_cbBlock= 0;
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}
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/*
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* CTxtBlk::MoveGap(ichGap)
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*
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* @mfunc
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* move gap in this text block
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*/
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void CTxtBlk::MoveGap(
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LONG ichGap) //@parm new position for the gap
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{
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TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtBlk::MoveGap");
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LONG cbMove;
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LONG ibGapNew = CbOfCch(ichGap);
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LPBYTE pbFrom = (LPBYTE) _pch;
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LPBYTE pbTo;
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if(ibGapNew == _ibGap)
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return;
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if(ibGapNew < _ibGap)
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{
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cbMove = _ibGap - ibGapNew;
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pbFrom += ibGapNew;
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pbTo = pbFrom + _cbBlock - CbOfCch(_cch);
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}
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else
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{
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cbMove = ibGapNew - _ibGap;
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pbTo = pbFrom + _ibGap;
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pbFrom = pbTo + _cbBlock - CbOfCch(_cch);
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}
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MoveMemory(pbTo, pbFrom, cbMove);
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_ibGap = ibGapNew;
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}
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/*
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* CTxtBlk::ResizeBlock(cbNew)
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*
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* @mfunc
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* resize this text block
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*
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* @rdesc
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* FALSE if block could not be resized <nl>
|
|
* non-FALSE otherwise
|
|
*
|
|
* @comm
|
|
* Side Effects: <nl>
|
|
* moves text block
|
|
*/
|
|
BOOL CTxtBlk::ResizeBlock(
|
|
LONG cbNew) //@parm the new size
|
|
{
|
|
TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtBlk::ResizeBlock");
|
|
|
|
TCHAR *pch;
|
|
LONG cbMove;
|
|
|
|
AssertSz(cbNew > 0, "resizing block to size <= 0");
|
|
AssertSz(cbNew <= cbBlockMost, "CTxtBlk::ResizeBlock() - block too big");
|
|
|
|
if(cbNew < _cbBlock)
|
|
{
|
|
if(_ibGap != CbOfCch(_cch))
|
|
{
|
|
// move text after gap down so that it doesn't get dropped
|
|
|
|
cbMove = CbOfCch(_cch) - _ibGap;
|
|
pch = _pch + CchOfCb(_cbBlock - cbMove);
|
|
MoveMemory(pch - CchOfCb(_cbBlock - cbNew), pch, cbMove);
|
|
}
|
|
_cbBlock = cbNew;
|
|
}
|
|
pch = (TCHAR*)PvReAlloc(_pch, cbNew);
|
|
if(!pch)
|
|
return _cbBlock == cbNew; // FALSE if grow, TRUE if shrink
|
|
|
|
_pch = pch;
|
|
if(cbNew > _cbBlock)
|
|
{
|
|
if(_ibGap != CbOfCch(_cch)) // Move text after gap to end so that
|
|
{ // we don't end up with two gaps
|
|
cbMove = CbOfCch(_cch) - _ibGap;
|
|
pch += CchOfCb(_cbBlock - cbMove);
|
|
MoveMemory(pch + CchOfCb(cbNew - _cbBlock), pch, cbMove);
|
|
}
|
|
_cbBlock = cbNew;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
// ======================== CTxtStory class ============================
|
|
/*
|
|
* CTxtStory::CTxtStory
|
|
*
|
|
* @mfunc Constructor
|
|
*
|
|
* @devnote Automatically allocates a text array. If we want to have a
|
|
* completely empty edit control, then don't allocate a story. NB!
|
|
*
|
|
*/
|
|
CTxtStory::CTxtStory()
|
|
{
|
|
TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtStory::CTxtStory");
|
|
|
|
_pCFRuns = NULL;
|
|
_pPFRuns = NULL;
|
|
}
|
|
|
|
/*
|
|
* CTxtStory::~CTxtStory
|
|
*
|
|
* @mfunc Destructor
|
|
*/
|
|
CTxtStory::~CTxtStory()
|
|
{
|
|
TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtStory::~CTxtStory");
|
|
|
|
// Remove formatting.
|
|
DeleteFormatRuns();
|
|
}
|
|
|
|
/*
|
|
* DeleteRuns ()
|
|
*
|
|
* @mfunc
|
|
* Helper function for DeleteFormatRuns() below. Releases
|
|
* formats used by format run collection before deleting the
|
|
* collection
|
|
*/
|
|
void DeleteRuns(CFormatRuns *pRuns, IFormatCache *pf)
|
|
{
|
|
if(pRuns) // Format runs may exist
|
|
{
|
|
LONG n = pRuns->Count();
|
|
if(n)
|
|
{
|
|
CFormatRun *pRun = pRuns->Elem(0);
|
|
for( ; n--; pRun++)
|
|
pf->Release(pRun->_iFormat); // Free run's format
|
|
}
|
|
delete pRuns;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* CTxtStory::DeleteFormatRuns ()
|
|
*
|
|
* @mfunc Convert to plain - remove format runs
|
|
*/
|
|
void CTxtStory::DeleteFormatRuns()
|
|
{
|
|
TRACEBEGIN(TRCSUBSYSBACK, TRCSCOPEINTERN, "CTxtStory::ConvertToPlain");
|
|
|
|
DeleteRuns(_pCFRuns, GetCharFormatCache());
|
|
DeleteRuns(_pPFRuns, GetParaFormatCache());
|
|
|
|
_pCFRuns = NULL;
|
|
_pPFRuns = NULL;
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
//This dumps the contents of the CTxtStory
|
|
//TxtBlk & FormatRun arrays to the debug output.
|
|
void CTxtStory::DbgDumpStory(void)
|
|
{
|
|
CTxtBlk * pblk;
|
|
CFormatRun * pcfr;
|
|
CFormatRun * ppfr;
|
|
LONG ctxtr = 0;
|
|
LONG ccfr = 0;
|
|
LONG cpfr = 0;
|
|
LONG i;
|
|
|
|
ctxtr = _TxtArray.Count();
|
|
|
|
if (_pCFRuns)
|
|
ccfr = _pCFRuns->Count();
|
|
if (_pPFRuns)
|
|
cpfr = _pPFRuns->Count();
|
|
|
|
for(i = 0; i < ctxtr; i++)
|
|
{
|
|
pblk = (CTxtBlk*)_TxtArray.Elem(i);
|
|
Tracef(TRCSEVNONE, "TxtBlk #%d: cch = %d.", (i + 1), pblk->_cch);
|
|
}
|
|
|
|
for(i = 0; i < ccfr; i++)
|
|
{
|
|
pcfr = (CFormatRun*)_pCFRuns->Elem(i);
|
|
Tracef(TRCSEVNONE, "CFR #%d: cch = %d, iFormat = %d.",(i + 1), pcfr->_cch, pcfr->_iFormat);
|
|
}
|
|
|
|
for(i = 0; i < cpfr; i++)
|
|
{
|
|
ppfr = (CFormatRun*)_pPFRuns->Elem(i);
|
|
Tracef(TRCSEVNONE, "PFR #%d: cch = %d, iFormat = %d.",(i + 1), ppfr->_cch, ppfr->_iFormat);
|
|
|
|
}
|
|
}
|
|
#endif
|