92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1994 - 1994.
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//
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// File: tblrowal.hxx
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//
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// Contents: Declaration of the CTableRowAlloc class, used in allocation
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// of table row data and checking of column bindings.
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//
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// Classes: CTableRowAlloc
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//
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// History: 27 Jun 1994 Alanw Created
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//
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//--------------------------------------------------------------------------
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#pragma once
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#ifdef DISPLAY_INCLUDES
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#pragma message( "#include <" __FILE__ ">..." )
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#endif
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//+-------------------------------------------------------------------------
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//
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// Class: CTableRowAlloc
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//
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// Purpose: Track assignment of fields within a table row. Used to
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// check column bindings and to allocate appropriately
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// aligned memory to a table window.
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//
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// Interface:
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//
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//--------------------------------------------------------------------------
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class CTableRowAlloc : INHERIT_UNWIND
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{
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DECLARE_UNWIND
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enum { CB_INIT = 256 };
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public:
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CTableRowAlloc( unsigned cbRow = 0 );
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~CTableRowAlloc()
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{
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if ( _pRowMap != _aRowMap )
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{
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delete [] _pRowMap;
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}
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}
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// Allocate a column in a row, return offset in row
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USHORT AllocOffset( unsigned cbData, unsigned cbAlign, BOOL fGrow );
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// Reserve a run of data; return TRUE if successful
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BOOL ReserveRowSpace( unsigned iOffset, unsigned cbData );
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// Retrieve required row width
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USHORT GetRowWidth( void ) {
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return _maxRow;
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}
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// Set required row width, if greater than the current maximum.
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USHORT SetRowWidth( unsigned width ) {
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Win4Assert(width > 0 && width < USHRT_MAX);
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if (width > _maxRow)
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_maxRow = (WORD)width;
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return _maxRow;
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}
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private:
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BOOL _IsLikelyFree( unsigned iOffset, unsigned cbData );
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BOOL _IsInUse( unsigned i )
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{
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Win4Assert( i < _cbRow );
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return _pRowMap[i];
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}
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USHORT _maxRow; // required width of row
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USHORT _cbRow; // size of _pRowMap
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BYTE* _pRowMap; // Row map data
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// OPTIMIZATION to avoid doing memory allocations if possible.
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BYTE _aRowMap[CB_INIT];
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unsigned _iFirstFree; // Index of the first free entry in the map
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// OPTIMIZATION
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};
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