198 lines
5.3 KiB
C++
198 lines
5.3 KiB
C++
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//+---------------------------------------------------------------------
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//
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// File: vwadvhld.cxx
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//
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// Contents: Miscellaneous OLE helper routines
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//
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//------------------------------------------------------------------------
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#include "headers.hxx"
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#pragma hdrstop
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//+---------------------------------------------------------------
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//
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// Member: ViewAdviseHolder::ViewAdviseHolder, protected
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//
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// Synopsis: Constructor for ViewAdviseHolder class
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//
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//----------------------------------------------------------------
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ViewAdviseHolder::ViewAdviseHolder()
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{
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_refs = 1;
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_pAdvSink = NULL;
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_dwAdviseAspects = 0;
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_dwAdviseFlags = 0;
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}
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//+---------------------------------------------------------------
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//
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// Member: ViewAdviseHolder::~ViewAdviseHolder, protected
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//
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// Synopsis: Destructor for ViewAdviseHolder class
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//
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//----------------------------------------------------------------
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ViewAdviseHolder::~ViewAdviseHolder()
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{
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if (_pAdvSink != NULL)
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_pAdvSink->Release();
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}
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//+---------------------------------------------------------------
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//
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// Member: ViewAdviseHolder::QueryInterface, public
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//
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// Synopsis: Method of IUnknown interface
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//
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//----------------------------------------------------------------
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STDMETHODIMP
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ViewAdviseHolder::QueryInterface(REFIID riid, LPVOID FAR* ppvObj)
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{
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if (IsEqualIID(riid,IID_IUnknown))
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{
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*ppvObj = this;
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AddRef();
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return NOERROR;
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}
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DOUT(TEXT("ViewAdviseHolder::QueryInterface E_NOINTERFACE\r\n"));
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*ppvObj = NULL;
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return E_NOINTERFACE;
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}
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//+---------------------------------------------------------------
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//
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// Member: ViewAdviseHolder:AddRef, public
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//
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// Synopsis: Method of IUnknown interface
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//
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//----------------------------------------------------------------
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STDMETHODIMP_(ULONG)
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ViewAdviseHolder::AddRef(void)
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{
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return _refs++;
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}
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//+---------------------------------------------------------------
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//
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// Member: ViewAdviseHolder::Release, public
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//
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// Synopsis: Method of IUnknown interface
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//
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//----------------------------------------------------------------
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STDMETHODIMP_(ULONG)
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ViewAdviseHolder::Release(void)
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{
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if (--_refs == 0)
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delete this;
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return (_refs);
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}
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//+---------------------------------------------------------------
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//
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// Member: ViewAdviseHolder::SetAdvise, public
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//
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// Synopsis: Places an advise in the advise holder
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//
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// Arguments: The arguments are the same as to IViewObject::SetAdvise
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//
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// Notes: IViewObject objects using this advise holder delegate
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// their IViewObject::SetAdvise methods to this method.
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//
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//----------------------------------------------------------------
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STDMETHODIMP
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ViewAdviseHolder::SetAdvise(DWORD aspects, DWORD advf, LPADVISESINK pAdvSink)
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{
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if (_pAdvSink != NULL)
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_pAdvSink->Release();
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_pAdvSink = pAdvSink;
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if (_pAdvSink != NULL)
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_pAdvSink->AddRef();
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_dwAdviseAspects = aspects;
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_dwAdviseFlags = advf;
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return NOERROR;
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}
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//+---------------------------------------------------------------
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//
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// Member: ViewAdviseHolder::GetAdvise, public
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//
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// Synopsis: Reports on an advise in the advise holder
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//
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// Arguments: The arguments are the same as to IViewObject::GetAdvise
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//
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// Notes: IViewObject objects using this advise holder delegate
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// their IViewObject::GetAdvise methods to this method.
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//
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//----------------------------------------------------------------
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STDMETHODIMP
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ViewAdviseHolder::GetAdvise(DWORD FAR* pAspects,
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DWORD FAR* pAdvf,
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LPADVISESINK FAR* ppAdvSink)
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{
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*ppAdvSink = _pAdvSink;
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*pAspects = _dwAdviseAspects;
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*pAdvf = _dwAdviseFlags;
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return NOERROR;
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// review: is this the right return code if no advise has been set?
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}
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//+---------------------------------------------------------------
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//
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// Member: ViewAdviseHolder::SendOnViewChange, public
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//
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// Synopsis: Sends an OnViewChange notification to the registered advise.
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//
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// Arguments: [dwAspect] -- the display aspect that has changed
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//
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// Notes: The client IViewObject should call this method whenever
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// its view has changed.
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//
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//----------------------------------------------------------------
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void ViewAdviseHolder::SendOnViewChange(DWORD dwAspect)
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{
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if (_pAdvSink != NULL && (dwAspect&_dwAdviseAspects) != 0)
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_pAdvSink->OnViewChange(dwAspect, -1);
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}
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//+---------------------------------------------------------------
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//
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// Function: CreateViewAdviseHolder
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//
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// Synopsis: Creates a ViewAdviseHolder object
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//
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// Arguments: [ppViewHolder] -- place where the view holder is returned
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//
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// Returns: Success if the advise holder was created
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//
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// Notes: This function is directly analogous to the OLE provided
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// CreateDataAdviseHolder
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//
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//----------------------------------------------------------------
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HRESULT
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CreateViewAdviseHolder(LPVIEWADVISEHOLDER FAR* ppViewHolder)
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{
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//LPVIEWADVISEHOLDER pViewAdvHolder = new (NullOnFail) ViewAdviseHolder;
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LPVIEWADVISEHOLDER pViewAdvHolder = new ViewAdviseHolder;
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*ppViewHolder = pViewAdvHolder;
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if (pViewAdvHolder == NULL)
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{
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DOUT(TEXT("o2base/vwadvhld/CreateViewAdviseHolder failed\r\n"));
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return E_OUTOFMEMORY;
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}
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else
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return NOERROR;
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}
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