reactos/base/shell/explorer/utility/treedroptarget.h

   1 /**************************************************************************
   2    THIS CODE AND INFORMATION IS PROVIDED 'AS IS' WITHOUT WARRANTY OF
   3    ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
   4    THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
   5    PARTICULAR PURPOSE.
   6    Author: Leon Finker  01/2001
   7    Modifications: removed ATL dependencies, Martin Fuchs 7/2003
   8 **************************************************************************/
   9
  10 #include "dragdropimpl.h"
  11
  12  /// OLE drop target for tree controls
  13 class TreeDropTarget : public IDropTargetImpl
  14 {
  15 public:
  16         TreeDropTarget(HWND hTargetWnd) : IDropTargetImpl(hTargetWnd) {}
  17
  18         virtual bool OnDrop(FORMATETC* pFmtEtc, STGMEDIUM& medium, DWORD *pdwEffect)
  19         {
  20                 if (pFmtEtc->cfFormat == CF_HDROP && medium.tymed == TYMED_HGLOBAL)
  21                 {
  22                         HDROP hDrop = (HDROP)GlobalLock(medium.hGlobal);
  23                         if (hDrop != NULL)
  24                         {
  25                                 TCHAR szFileName[MAX_PATH];
  26
  27                                 UINT cFiles = DragQueryFile(hDrop, 0xFFFFFFFF, NULL, 0);
  28
  29                                 for(UINT i = 0; i < cFiles; ++i)
  30                                 {
  31                                         DragQueryFile(hDrop, i, szFileName, sizeof(szFileName));
  32
  33                                         if (DROPEFFECT_COPY & *pdwEffect)
  34                                         {
  35                                                  // copy the file or dir
  36
  37                                                 ///@todo Add the code to handle Copy
  38
  39                                         }
  40                                         else if (DROPEFFECT_MOVE & *pdwEffect)
  41                                         {
  42                                                  // move the file or dir
  43
  44                                                 ///@todo Add the code to handle Move
  45
  46                                         }
  47                                 }
  48                                 //DragFinish(hDrop); // base class calls ReleaseStgMedium
  49                         }
  50                         GlobalUnlock(medium.hGlobal);
  51                 }
  52
  53                 TreeView_SelectDropTarget(m_hTargetWnd, NULL);
  54
  55                 return true; //let base free the medium
  56         }
  57
  58         virtual HRESULT STDMETHODCALLTYPE DragOver(
  59         /* [in] */ DWORD grfKeyState,
  60         /* [in] */ POINTL pt,
  61         /* [out][in] */ DWORD __RPC_FAR *pdwEffect)
  62         {
  63                 TVHITTESTINFO hit;
  64                 hit.pt = (POINT&)pt;
  65                 ScreenToClient(m_hTargetWnd, &hit.pt);
  66                 hit.flags = TVHT_ONITEM;
  67                 HTREEITEM hItem = TreeView_HitTest(m_hTargetWnd,&hit);
  68
  69                 if (hItem != NULL)
  70                         TreeView_SelectDropTarget(m_hTargetWnd, hItem);
  71
  72                 return IDropTargetImpl::DragOver(grfKeyState, pt, pdwEffect);
  73         }
  74
  75         virtual HRESULT STDMETHODCALLTYPE DragLeave(void)
  76         {
  77                 TreeView_SelectDropTarget(m_hTargetWnd, NULL);
  78
  79                 return IDropTargetImpl::DragLeave();
  80         }
  81 };