Source code of Windows XP (NT5)
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265 lines
4.3 KiB

/*++
Copyright (c) 1990-1998, Microsoft Corporation All rights reserved.
Module Name:
tlog.cpp
Abstract:
This module implements the travel log functionality for file open
and save as dialogs.
Revision History:
02-20-98 arulk created
--*/
// precompiled headers
#include "precomp.h"
#pragma hdrstop
#include "util.h"
#include "d32tlog.h"
//-------------------------------------------------------------------------
// Travel Log Link implementation
//-------------------------------------------------------------------------
TLogLink::TLogLink()
:_cRef(1), _pidl(NULL), _ptllNext(NULL), _ptllPrev(NULL)
{
}
TLogLink::TLogLink(LPITEMIDLIST pidl)
:_cRef(1), _pidl(NULL), _ptllNext(NULL), _ptllPrev(NULL)
{
_pidl = ILClone(pidl);
}
TLogLink::~TLogLink()
{
if (_pidl)
{
ILFree(_pidl);
}
if (_ptllNext)
{
_ptllNext->Release();
}
}
UINT TLogLink::AddRef()
{
return ++_cRef;
}
UINT TLogLink::Release()
{
if (--_cRef > 0)
{
return _cRef;
}
delete this;
return 0;
}
void TLogLink::SetNextLink(TLogLink* ptllNext)
{
//Do we already have Next Link ?
if (_ptllNext)
{
// Release the next link
_ptllNext->Release();
}
//Set the given pointer as our next pointer
_ptllNext = ptllNext;
if (_ptllNext)
{
//Since we are caching the pointer , Add reference to it
_ptllNext->AddRef();
//Also update the prev link of our new pointer to point to us
_ptllNext->_ptllPrev = this;
}
}
HRESULT TLogLink::GetPidl(LPITEMIDLIST* ppidl)
{
*ppidl = ILClone(_pidl);
if (*ppidl)
return NOERROR;
else {
return E_OUTOFMEMORY;
}
}
HRESULT TLogLink::SetPidl(LPITEMIDLIST pidl)
{
if (_pidl)
{
ILFree(_pidl);
}
_pidl = ILClone(pidl);
return NOERROR;
}
BOOL TLogLink::CanTravel(int iDir)
{
BOOL fRet = FALSE;
switch ( iDir )
{
case ( TRAVEL_BACK ) :
{
if (_ptllPrev != NULL)
{
fRet = TRUE;
}
break;
}
case ( TRAVEL_FORWARD ) :
{
if (_ptllNext !=NULL)
{
fRet = TRUE;
}
break;
}
}
return fRet;
}
//----------------------------------------------------------------------------------
//Travel Log Class Implementation
//----------------------------------------------------------------------------------
TravelLog::TravelLog()
:_cRef(1),_ptllCurrent(NULL), _ptllRoot(NULL)
{
}
TravelLog::~TravelLog()
{
if (_ptllRoot)
{
_ptllRoot->Release();
}
}
UINT TravelLog::AddRef()
{
return ++_cRef;
}
UINT TravelLog::Release()
{
if (--_cRef > 0 )
return _cRef;
delete this;
return 0;
}
HRESULT TravelLog::AddEntry(LPITEMIDLIST pidl)
{
TLogLink *ptll = new TLogLink(pidl);
if (!ptll)
return E_FAIL;
if (_ptllCurrent) {
_ptllCurrent->SetNextLink(ptll);
ptll->Release();
}
else
{
_ptllRoot = ptll;
}
_ptllCurrent = ptll;
return NOERROR;
}
BOOL TravelLog::CanTravel(int iDir)
{
if (_ptllCurrent)
{
return _ptllCurrent->CanTravel(iDir);
}
return FALSE;
}
HRESULT TravelLog::Travel(int iDir)
{
HRESULT hres = E_FAIL;
TLogLink *ptll;
switch(iDir)
{
case ( TRAVEL_FORWARD ) :
{
if (CanTravel(iDir))
{
ptll = _ptllCurrent->GetNextLink();
_ptllCurrent = ptll;
hres = NOERROR;
}
break;
}
case ( TRAVEL_BACK ):
{
if (CanTravel(iDir))
{
ptll = _ptllCurrent->GetPrevLink();
_ptllCurrent = ptll;
hres = NOERROR;
}
break;
}
}
return hres;
}
HRESULT TravelLog::GetCurrent(LPITEMIDLIST *ppidl)
{
//Set the return value. Just in case
*ppidl = NULL;
if (_ptllCurrent)
{
return _ptllCurrent->GetPidl(ppidl);
}
return E_FAIL;
}
HRESULT Create_TravelLog(TravelLog **pptlog)
{
HRESULT hres = E_FAIL;
*pptlog = new TravelLog();
if (*pptlog)
{
hres = S_OK;
}
return hres;
}