191 lines
3.5 KiB
C++
191 lines
3.5 KiB
C++
#include "shellprv.h"
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#pragma hdrstop
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#include "subdata.h"
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///////////////////////////////////////////////////////////////////////////////
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//
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///////////////////////////////////////////////////////////////////////////////
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BOOL CSubData::Init(CSubDataProvider* pSDProv, SUBDATACB fctCB, PVOID pvData)
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{
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_pSDProv = pSDProv;
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_fctCB = fctCB;
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_pvData = pvData;
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#ifdef DEBUG
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ASSERT(!_fInited);
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_fInited = TRUE;
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#endif
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return TRUE;
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}
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BOOL CSubData::InitStatic(STATICSUBDATACB fctStaticCB, PVOID pvData)
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{
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_fStatic = TRUE;
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_fctStaticCB = fctStaticCB;
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_pvData = pvData;
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#ifdef DEBUG
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ASSERT(!_fInited);
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_fInited = TRUE;
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#endif
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return TRUE;
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}
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BOOL CSubData::InitExpiration(DWORD cTick)
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{
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ASSERT(_fInited);
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_cTickExpiration = cTick;
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return TRUE;
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}
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BOOL CSubData::Update()
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{
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ASSERT(_fInited);
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BOOL fNeedUpdate = FALSE;
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BOOL fRet = TRUE;
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if (!_fHoldUpdate)
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{
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// Check if we need to update the info?
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if (_IsValid())
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{
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// Did we at least update once?
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if (!_GetTickLastUpdate())
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{
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// No
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fNeedUpdate = TRUE;
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}
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else
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{
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// Is the information expired?
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if (_IsExpired())
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{
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// Yes
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fNeedUpdate = TRUE;
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}
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}
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}
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if (!_IsValid() || fNeedUpdate)
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{
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_fInvalid = FALSE;
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fRet = _Call();
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}
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// TBDTBD: in DEBUG_PARANOID do call anyway to see if accurate
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}
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return fRet;
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}
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void CSubData::HoldUpdates()
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{
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ASSERT(_fInited);
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_fHoldUpdate = TRUE;
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}
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void CSubData::ResumeUpdates()
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{
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ASSERT(_fInited);
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_fHoldUpdate = FALSE;
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}
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void CSubData::Invalidate()
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{
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_fInvalid = TRUE;
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}
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CSubData::CSubData() : _cTickExpiration(EXPIRATION_NEVER)
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{}
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///////////////////////////////////////////////////////////////////////////////
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//
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///////////////////////////////////////////////////////////////////////////////
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BOOL CSubData::_Call()
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{
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// TBDTBD: Getsystemtime for stats
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BOOL fRet = TRUE;
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if (!_fStatic)
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{
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if (_fctCB)
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{
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// Calling with the CSubDataProvider ptr the passed in
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// CSubDataProvider's member fct
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fRet = (_pSDProv->*_fctCB)(_GetDataPtr());
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}
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}
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else
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{
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if (_fctStaticCB)
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{
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fRet = _fctStaticCB(_GetDataPtr());
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}
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}
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_SetTickLastUpdate(GetTickCount());
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return fRet;
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}
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void CSubData::_SetTickLastUpdate(DWORD dwTick)
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{
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_dwTickLast = dwTick;
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}
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DWORD CSubData::_GetTickLastUpdate()
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{
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return _dwTickLast;
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}
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DWORD* CSubData::_GetTickLastUpdatePtr()
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{
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return &_dwTickLast;
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}
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PVOID CSubData::_GetDataPtr()
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{
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ASSERT(_pvData);
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return _pvData;
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}
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void CSubData::_SetDataPtr(PVOID pvData)
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{
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_pvData = pvData;
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}
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BOOL CSubData::_IsExpired()
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{
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BOOL fExpired = FALSE;
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DWORD dwTickCurrent = GetTickCount();
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// Is the information expired? Check also for the wrapping case.
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if ((EXPIRATION_NEVER != _cTickExpiration) && ((_GetTickLastUpdate() > dwTickCurrent) ||
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((dwTickCurrent - _GetTickLastUpdate()) > _cTickExpiration)))
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{
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// Yes
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fExpired = TRUE;
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}
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return fExpired;
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}
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BOOL CSubData::_IsValid()
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{
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return !_fInvalid;
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}
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