121 lines
2.7 KiB
C++
121 lines
2.7 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 2000.
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//
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// File: wnotifmg.hxx
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//
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// Contents: BigTable to Client notifications manager.
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//
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// Classes:
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//
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// Functions:
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//
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// History: 11-30-94 srikants Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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class CNotificationRegion;
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class CRowIndex;
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class CNotificationMgr
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{
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public:
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CNotificationMgr( CRowIndex & rowIndexSnap )
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: _rowIndexSnap(rowIndexSnap),
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_fSignalled(FALSE),
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_fFullRegion(FALSE)
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{}
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// Check if any notification regions are currently active.
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BOOL IsEmpty() const
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{
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return !_fFullRegion;
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}
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// Check if any of the notification regions have already detected a
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// change.
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BOOL IsSignalled() const { return _fSignalled; }
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void SetSignalled () { _fSignalled = TRUE; }
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void ClearSignalled() { _fSignalled = FALSE; }
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// Region manipulation routines.
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void AddRegion( const CNotificationRegion & region );
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void DeleteRegion( const CNotificationRegion & region );
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void ExtendRegion( const CNotificationRegion & regionOld,
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const CNotificationRegion & regionNew );
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void ShrinkRegion( const CNotificationRegion & regionOld,
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const CNotificationRegion & regionNew );
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// To make the entire region a notification region.
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void AddFullRegion()
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{
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_fFullRegion = TRUE;
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}
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void DeleteAllRegions()
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{
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_fFullRegion = FALSE;
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}
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//
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// Check to see if the given row is being added in the notification
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// region.
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//
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BOOL IsAddInNotifyRegion( ULONG oTableRow )
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{
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return _fFullRegion;
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}
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//
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// Check to see if the given row is being deleted from a notification
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// region.
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//
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BOOL IsDeleteInNotifyRegion( ULONG oTableRow )
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{
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return _fFullRegion;
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}
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void SplitRegion( CNotificationMgr & left, CNotificationMgr & right,
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ULONG oSplitRow )
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{
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if ( !_fFullRegion )
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{
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left.DeleteAllRegions();
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right.DeleteAllRegions();
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}
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else
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{
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left.AddFullRegion();
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right.AddFullRegion();
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}
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}
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private:
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// Snap shot of the row index on which notification regions are defined.
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CRowIndex & _rowIndexSnap;
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// Flag indicating if any of the notification regions have already seen
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// a change.
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BOOL _fSignalled;
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// The entire region is of interest for notifications
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BOOL _fFullRegion;
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};
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