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60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
// Classic Shell (c) 2009-2017, Ivo Beltchev
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// Open-Shell (c) 2017-2018, The Open-Shell Team
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// Confidential information of Ivo Beltchev. Not for disclosure or distribution without prior written consent from the author
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#pragma once
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// CDropTargetProxy - a wrapper for another object's IDropTarget. On Windows 8.1 the interface is not properly released
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// when the window is destroyed during a drag operation. So the wrapper is used as a decoy to minimize the leaked resources
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class CDropTargetProxy: public IDropTarget
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{
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public:
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CDropTargetProxy( IDropTarget *pOwner )
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{
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m_pOwner=pOwner;
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m_RefCount=0;
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}
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~CDropTargetProxy( void ) = default;
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void Reset( void )
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{
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m_pOwner=NULL;
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}
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// IUnknown
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virtual STDMETHODIMP QueryInterface( REFIID riid, void **ppvObject )
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{
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*ppvObject=NULL;
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if (IID_IUnknown==riid || IID_IDropTarget==riid)
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{
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AddRef();
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*ppvObject=static_cast<IDropTarget*>(this);
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return S_OK;
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}
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return E_NOINTERFACE;
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}
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virtual ULONG STDMETHODCALLTYPE AddRef( void )
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{
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return InterlockedIncrement(&m_RefCount);
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}
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virtual ULONG STDMETHODCALLTYPE Release( void )
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{
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long nTemp=InterlockedDecrement(&m_RefCount);
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if (!nTemp) delete this;
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return nTemp;
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}
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// IDropTarget
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virtual HRESULT STDMETHODCALLTYPE DragEnter( IDataObject *pDataObj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect );
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virtual HRESULT STDMETHODCALLTYPE DragOver( DWORD grfKeyState, POINTL pt, DWORD *pdwEffect );
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virtual HRESULT STDMETHODCALLTYPE DragLeave( void );
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virtual HRESULT STDMETHODCALLTYPE Drop( IDataObject *pDataObj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect );
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private:
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IDropTarget *m_pOwner;
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LONG m_RefCount;
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};
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