102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
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#include <windows.h>
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#include "dropsrc.h"
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#include "common.h"
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//-----------------------------------------------------------------
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typedef struct {
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IDropSource dsrc;
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UINT cRef;
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DWORD grfInitialKeyState;
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} CDropSource;
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IDropSourceVtbl c_CDropSourceVtbl; // forward decl
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HRESULT CDropSource_CreateInstance(IDropSource **ppdsrc)
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{
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CDropSource *this = (CDropSource *)LocalAlloc(LPTR, sizeof(CDropSource));
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if (this)
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{
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this->dsrc.lpVtbl = &c_CDropSourceVtbl;
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this->cRef = 1;
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*ppdsrc = &this->dsrc;
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return S_OK;
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}
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else
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{
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*ppdsrc = NULL;
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return E_OUTOFMEMORY;
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}
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}
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STDMETHODIMP CDropSource_QueryInterface(IDropSource *pdsrc, REFIID riid, void **ppvObj)
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{
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CDropSource *this = IToClass(CDropSource, dsrc, pdsrc);
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if (IsEqualIID(riid, &IID_IDropSource) || IsEqualIID(riid, &IID_IUnknown))
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{
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*ppvObj = this;
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this->cRef++;
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return S_OK;
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}
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*ppvObj = NULL;
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return E_NOINTERFACE;
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}
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STDMETHODIMP_(ULONG) CDropSource_AddRef(IDropSource *pdsrc)
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{
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CDropSource *this = IToClass(CDropSource, dsrc, pdsrc);
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this->cRef++;
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return this->cRef;
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}
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STDMETHODIMP_(ULONG) CDropSource_Release(IDropSource *pdsrc)
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{
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CDropSource *this = IToClass(CDropSource, dsrc, pdsrc);
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this->cRef--;
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if (this->cRef > 0)
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return this->cRef;
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LocalFree((HLOCAL)this);
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return 0;
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}
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STDMETHODIMP CDropSource_QueryContinueDrag(IDropSource *pdsrc, BOOL fEscapePressed, DWORD grfKeyState)
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{
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CDropSource *this = IToClass(CDropSource, dsrc, pdsrc);
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if (fEscapePressed)
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return DRAGDROP_S_CANCEL;
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// initialize ourself with the drag begin button
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if (this->grfInitialKeyState == 0)
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this->grfInitialKeyState = (grfKeyState & (MK_LBUTTON | MK_RBUTTON | MK_MBUTTON));
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Assert(this->grfInitialKeyState);
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if (!(grfKeyState & this->grfInitialKeyState))
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return DRAGDROP_S_DROP;
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else
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return S_OK;
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}
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STDMETHODIMP CDropSource_GiveFeedback(IDropSource *pdsrc, DWORD dwEffect)
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{
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CDropSource *this = IToClass(CDropSource, dsrc, pdsrc);
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return DRAGDROP_S_USEDEFAULTCURSORS;
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}
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IDropSourceVtbl c_CDropSourceVtbl = {
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CDropSource_QueryInterface, CDropSource_AddRef, CDropSource_Release,
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CDropSource_QueryContinueDrag,
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CDropSource_GiveFeedback
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};
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