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81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
/**************************************************************************
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THIS CODE AND INFORMATION IS PROVIDED 'AS IS' WITHOUT WARRANTY OF
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ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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PARTICULAR PURPOSE.
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Author: Leon Finker 01/2001
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Modifications: removed ATL dependencies, Martin Fuchs 7/2003
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**************************************************************************/
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#include "dragdropimpl.h"
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/// OLE drop target for tree controls
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class TreeDropTarget : public IDropTargetImpl
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{
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public:
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TreeDropTarget(HWND hTargetWnd) : IDropTargetImpl(hTargetWnd) {}
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virtual bool OnDrop(FORMATETC* pFmtEtc, STGMEDIUM& medium, DWORD *pdwEffect)
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{
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if (pFmtEtc->cfFormat == CF_HDROP && medium.tymed == TYMED_HGLOBAL)
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{
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HDROP hDrop = (HDROP)GlobalLock(medium.hGlobal);
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if (hDrop != NULL)
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{
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TCHAR szFileName[MAX_PATH];
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UINT cFiles = DragQueryFile(hDrop, 0xFFFFFFFF, NULL, 0);
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for(UINT i = 0; i < cFiles; ++i)
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{
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DragQueryFile(hDrop, i, szFileName, sizeof(szFileName));
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if (DROPEFFECT_COPY & *pdwEffect)
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{
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// copy the file or dir
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///@todo Add the code to handle Copy
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}
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else if (DROPEFFECT_MOVE & *pdwEffect)
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{
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// move the file or dir
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///@todo Add the code to handle Move
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}
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}
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//DragFinish(hDrop); // base class calls ReleaseStgMedium
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}
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GlobalUnlock(medium.hGlobal);
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}
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TreeView_SelectDropTarget(m_hTargetWnd, NULL);
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return true; //let base free the medium
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}
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virtual HRESULT STDMETHODCALLTYPE DragOver(
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/* [in] */ DWORD grfKeyState,
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/* [in] */ POINTL pt,
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/* [out][in] */ DWORD __RPC_FAR *pdwEffect)
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{
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TVHITTESTINFO hit;
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hit.pt = (POINT&)pt;
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ScreenToClient(m_hTargetWnd, &hit.pt);
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hit.flags = TVHT_ONITEM;
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HTREEITEM hItem = TreeView_HitTest(m_hTargetWnd,&hit);
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if (hItem != NULL)
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TreeView_SelectDropTarget(m_hTargetWnd, hItem);
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return IDropTargetImpl::DragOver(grfKeyState, pt, pdwEffect);
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}
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virtual HRESULT STDMETHODCALLTYPE DragLeave(void)
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{
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TreeView_SelectDropTarget(m_hTargetWnd, NULL);
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return IDropTargetImpl::DragLeave();
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}
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};
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