172 lines
4.3 KiB
C++
172 lines
4.3 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1996 - 1999.
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//
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// File: watch.hxx
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//
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// Contents:
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//
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// History: 15 Aug 1996 DLee Created
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//
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//--------------------------------------------------------------------------
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#pragma once
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#include <ocidl.h>
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const unsigned cmsNotifySpacing = 1000;
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const unsigned cmsStartSpacing = 100;
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const unsigned cmsBackoff = 100;
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const unsigned cmsSleep = 50;
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class CRowsetNotifyWatch : public IRowsetWatchNotify
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{
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public:
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CRowsetNotifyWatch(HWND hwnd) :
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_cRef(1),
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_hwndNotify(hwnd),
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_cmsTicks(GetTickCount() + cmsNotifySpacing),
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_cmsSpacing( cmsStartSpacing ),
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_fHoldNotifications( FALSE ),
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_fIgnore( FALSE ),
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_wnLast( 0 )
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{
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srchDebugOut((DEB_TRACE,"CRowsetNotifyWatch::Construct\n"));
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}
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~CRowsetNotifyWatch()
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{
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srchDebugOut((DEB_TRACE,"CRowsetNotifyWatch::~\n"));
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}
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// IUnknown methods.
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STDMETHOD(QueryInterface) (THIS_ REFIID riid, LPVOID *ppiuk)
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{
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srchDebugOut((DEB_TRACE,"CRowsetNotifyWatch::QI\n"));
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*ppiuk = (void **) this; // hold our breath and jump
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AddRef();
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return S_OK;
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}
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STDMETHOD_(ULONG, AddRef) (THIS)
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{
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srchDebugOut((DEB_TRACE,"CRowsetNotifyWatch::AddRef\n"));
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return ++_cRef;
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}
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STDMETHOD_(ULONG, Release) (THIS)
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{
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srchDebugOut((DEB_TRACE,"CRowsetNotifyWatch::Release\n"));
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ULONG tmp = --_cRef;
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if ( 0 == _cRef )
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delete this;
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return tmp;
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}
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// IRowsetNotifyWatch method
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STDMETHOD( OnChange) (THIS_ IRowset* pRowset, DBWATCHNOTIFY changeType)
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{
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AddRef();
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srchDebugOut((DEB_TRACE,"CRowsetNotifyWatch::OnChange Top\n"));
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if ( DBWATCHNOTIFY_QUERYDONE != changeType )
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{
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while ( ( _fHoldNotifications ) ||
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( ( GetTickCount() - _cmsTicks ) < _cmsSpacing ) )
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{
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if ( ( _fIgnore ) ||
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( 1 == _cRef ) ) // did we die in our sleep?
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break;
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Sleep( cmsSleep );
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}
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}
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if ( ( !_fIgnore ) &&
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( _cRef > 1 ) ) // did we (the query) die in our sleep?
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{
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_wnLast = changeType;
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PostMessage( _hwndNotify,
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wmNotification,
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changeType,
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(LPARAM) pRowset );
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_cmsTicks = GetTickCount();
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_cmsSpacing = __min( cmsNotifySpacing,
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cmsBackoff + _cmsSpacing );
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srchDebugOut(( DEB_TRACE, "CRowsetNotifyWatch::OnChange Blasted\n" ));
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}
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else
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{
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srchDebugOut((DEB_TRACE,"CRowsetNotifyWatch::OnChange die\n"));
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}
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Release();
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return S_OK;
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}
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// private methods
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void HoldNotifications( BOOL f )
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{
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_fHoldNotifications = f;
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_cmsTicks = GetTickCount();
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}
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void IgnoreNotifications( BOOL fIgnore )
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{ _fIgnore = fIgnore; }
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private:
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ULONG _cRef;
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HWND _hwndNotify;
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ULONG _cmsTicks;
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ULONG _cmsSpacing;
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BOOL _fHoldNotifications;
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BOOL _fIgnore;
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DBWATCHNOTIFY _wnLast;
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};
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class CSearchQuery;
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class CBookMark;
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class CWatchQuery
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{
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public:
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CWatchQuery (CSearchQuery* pSearch, IRowsetScroll* pRowset);
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~CWatchQuery ();
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BOOL Ok () const { return _pRowsetWatch != 0; }
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void Notify (HWND hwndList, DBWATCHNOTIFY changeType);
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void NotifyComplete();
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void RowsChanged (HWND hwnd);
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void Extend (HWATCHREGION hRegion);
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void Move (HWATCHREGION hRegion);
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void Shrink (HWATCHREGION hRegion, CBookMark& bmk, ULONG cRows);
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HWATCHREGION Handle() { return _hRegion; }
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void IgnoreNotifications( BOOL fIgnore )
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{ _pNotifyWatch->IgnoreNotifications( fIgnore ); }
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private:
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void ExecuteScript (HWND hwndList, ULONG cChanges, DBROWWATCHCHANGE* aScript);
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CSearchQuery* _pClient;
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BOOL _fEverGotARowsChanged;
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DBWATCHNOTIFY _wnLast;
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IConnectionPointContainer *_pContainer;
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IConnectionPoint * _pPoint;
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DWORD _dwAdviseID;
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CRowsetNotifyWatch * _pNotifyWatch;
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IRowsetWatchRegion* _pRowsetWatch;
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HWATCHREGION _hRegion;
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DWORD _mode;
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};
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