www.pudn.com > multidown > OleListDropTarget.cpp

// OleListDropTarget.cpp: implementation of the COleListDropTarget class. 
// 
////////////////////////////////////////////////////////////////////// 
 
#include "stdafx.h" 
#include "OleListDropTarget.h" 
#include "GetList.h" 
 
#ifdef _DEBUG 
#undef THIS_FILE 
static char THIS_FILE[]=__FILE__; 
#define new DEBUG_NEW 
#endif 
 
////////////////////////////////////////////////////////////////////// 
// Construction/Destruction 
////////////////////////////////////////////////////////////////////// 
 
COleListDropTarget::COleListDropTarget(CWnd* pParent) 
{ 
	m_pParent = pParent; 
} 
 
COleListDropTarget::~COleListDropTarget() 
{ 
 
} 
 
 
 
// 
// OnDragEnter is called by OLE dll's when drag cursor enters 
// a window that is REGISTERed with the OLE dll's 
// 
DROPEFFECT COleListDropTarget::OnDragEnter(CWnd* pWnd, COleDataObject*  
           pDataObject, DWORD dwKeyState, CPoint point ) 
{ 
	if (!pDataObject->IsDataAvailable(CF_TEXT)) 
	{ 
		return DROPEFFECT_NONE; 
	 
	} 
 
    // if the control key is held down, return a drop effect COPY  
    if((dwKeyState&MK_CONTROL) == MK_CONTROL) 
        return DROPEFFECT_COPY; 
    // Otherwise return a drop effect of MOVE 
    else 
        return DROPEFFECT_MOVE;     
} 
 
// 
// OnDragLeave is called by OLE dll's when drag cursor leaves 
// a window that is REGISTERed with the OLE dll's 
// 
void COleListDropTarget::OnDragLeave(CWnd* pWnd) 
{ 
    // Call base class implementation 
    COleDropTarget::OnDragLeave(pWnd); 
} 
 
//  
// OnDragOver is called by OLE dll's when cursor is dragged over  
// a window that is REGISTERed with the OLE dll's 
// 
DROPEFFECT COleListDropTarget::OnDragOver(CWnd* pWnd, COleDataObject*  
           pDataObject, DWORD dwKeyState, CPoint point ) 
{      
	if (!pDataObject->IsDataAvailable(CF_TEXT)) 
		return DROPEFFECT_NONE; 
 
    if((dwKeyState&MK_CONTROL) == MK_CONTROL) 
        return DROPEFFECT_NONE;   
    else 
        return DROPEFFECT_MOVE;  // move source 
} 
 
 
BOOL COleListDropTarget::OnDrop(CWnd* pWnd, COleDataObject* pDataObject,  
                 DROPEFFECT dropEffect, CPoint point ) 
{            
    HGLOBAL  hGlobal; 
    LPCSTR   pData;                      
 
	if (pDataObject->IsDataAvailable(CF_TEXT)) 
	{		 
		STGMEDIUM Stg; 
		BOOL bValue = pDataObject->GetData(CF_TEXT, &Stg);		 
 
		TCHAR *strText = (TCHAR*)GlobalLock(Stg.hGlobal); 
		 
		CString strUrl; 
		strUrl.Format("%s",strText); 
 
		((CGetList *)m_pParent)->AddUrl(strUrl); 
 
		GlobalUnlock(Stg.hGlobal); 
		GlobalFree(Stg.hGlobal);		 
	} 
 
    if((dropEffect & DROPEFFECT_MOVE) != DROPEFFECT_MOVE) 
        return FALSE; 
 
    // Get text data from COleDataObject 
    hGlobal=pDataObject->GetGlobalData(CF_TEXT); 
 
    // Get pointer to data 
    pData=(LPCSTR)GlobalLock(hGlobal);     
    ASSERT(pData!=NULL);  
 
    // Unlock memory - Send dropped text into the "bit-bucket" 
    GlobalUnlock(hGlobal); 
 
    return TRUE; 
} 
 
void COleListDropTarget::SetParent(CWnd *pParent) 
{ 
	m_pParent = pParent; 
}