treedroptarget.h

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