请各位高手帮忙！！！

whlldddd 2011-05-03 11:18:45
小弟初学VC，最近在用bcg做一个程序，bcg里有一个workspacebar的树形菜单，我想实现对树的拖拽，拖拽到view栏中，并能够在视图栏中显示一个图标，请各位帮忙！！
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Tim_Chase 2012-06-05
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谢谢前辈，受教了！
向立天 2011-05-20
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您好
我是本版版主
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海盗医生 2011-05-05
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楼主使用时，请去掉#include "LAD EDIT.h"
海盗医生 2011-05-05
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昨天连续发了3次，就不能发了，今天继续

最后一步，模拟拖拽：



模拟拖拽动作



数据源中响应鼠标消息， OnLButtonDown

[code=C/C++]

void CXX::OnLButtonDown(UINT nFlags, CPoint point) 

{

   // TODO: Add your message handler code here and/or call default

   SetFocus();

   

   HTREEITEM hItem = HitTest(point, NULL);

   if(NULL != hItem)

   {

      SelectItem(hItem);

      XX*pBlockLib = (XX*)GetItemData(hItem);

      if(NULL != pBlockLib)

      {

         HGLOBAL hData = GlobalAlloc(GHND|GMEM_SHARE, sizeof(XX));

         char *pS = (char *)GlobalLock(hData);

         memcpy(pS, (LPCTSTR)pBlockLib, sizeof(XX));

         GlobalUnlock(hData);

         

         COleDataSource source;

         UINT uBlockFormat = m_uBlockFormat;

         source.CacheGlobalData(uBlockFormat, hData);

         source.DoDragDrop(DROPEFFECT_COPY);

         GlobalFree(hData);

      }

   }

}


上边m_uBlockFormat要事先注册


   UINT m_uBlockFormat = RegisterClipboardFormat("myblock");

   if(0 == m_uBlockFormat)

   {//register failed

      if(MessageBox(NULL, "Register the block format error!", "Error\n \

         close the instance(Y/N)", MB_YESNO) == IDYES)

      {

         return FALSE;

      }

   }


鼠标拖到目标上：
重写
virtual BOOL OnDrop(COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point);
virtual DROPEFFECT OnDragOver(COleDataObject* pDataObject, DWORD dwKeyState, CPoint point);



DROPEFFECT CxxView::OnDragOver(COleDataObject* pDataObject, DWORD dwKeyState, CPoint point) 

{

	// TODO: Add your specialized code here and/or call the base class

	

	//return CScrollView::OnDragOver(pDataObject, dwKeyState, point);



   UINT uBlockFormat = m_uBlockFormat;

   if(pDataObject->IsDataAvailable(uBlockFormat))

		return DROPEFFECT_COPY;

	else

		return DROPEFFECT_NONE;

}



BOOL CxxView::OnDrop(COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point) 

{

   // TODO: Add your specialized code here and/or call the base class

   CPoint scrpt = GetScrollPosition();

   CPoint pt(point.x+scrpt.x, point.y+scrpt.y);



   UINT uBlockFormat = m_uBlockFormat;

   if(pDataObject->IsDataAvailable(uBlockFormat))

   {

      HGLOBAL hMem = pDataObject->GetGlobalData(uBlockFormat);

      XX*pBlockLib = (XX*)GlobalLock((HGLOBAL)hMem);

      //自己处理的函数(pBlockLib, pt);

      GlobalUnlock(hMem);//unlock source

      Invalidate();

   }

   

	return CScrollView::OnDrop(pDataObject, dropEffect, point);

}

[/code]
海盗医生 2011-05-04
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如何使用：
数据源注册：
COleDropTargetEx m_OleDropTarget;

   if(!m_OleDropTarget.Register(this))

   {

      MessageBox("Register error!", "Error" , MB_OK);

   }

目标注册：
与数据来源者注册一样
COleDropTargetEx m_OleDropTarget;

   if(!m_OleDropTarget.Register(this))

   {

      MessageBox("Register error!", "Error" , MB_OK);

   }


注册是很重要的一步，只有两头都要注册才会有效
海盗医生 2011-05-04
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OleDropTargetEx.h


// OleDropTargetEx.h: interface for the COleDropTargetEx class.



#if !defined(AFX_OLEDROPTARGETEX_H__I_LOVE_MY_MOTHERLAND)

#define AFX_OLEDROPTARGETEX_H__I_LOVE_MY_MOTHERLAND



#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000

// OleDropTargetEx.h header file

//Drag & Drop User define Messages



/////////////////////////////////////////////////////////////////////////////

//Drop info class

//ΪÍ϶¯ÏûÏ¢ÏìÓ¦º¯ÊýÌṩÍ϶¯ÐÅÏ¢

class COleDropInfo : public CObject

{

public:

	COleDropInfo();

	COleDropInfo(COleDataObject* pDataObject,DWORD dwKeyState,

		DROPEFFECT dropEffect,DROPEFFECT dropEffectList,CPoint point );

	virtual ~COleDropInfo();



public:

	//COleDropTargetEx member functions params

	COleDataObject* m_pDataObject;

	DWORD m_dwKeyState;

	DROPEFFECT m_dropEffect;

	DROPEFFECT m_dropEffectList;

	CPoint m_point;



	DECLARE_DYNAMIC( COleDropInfo );

};



/////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////

//COleDropTargetEx class 

class COleDropTargetEx : public COleDropTarget

{

public:

	COleDropTargetEx();

	virtual ~COleDropTargetEx();



protected:

//´¦ÀíOnDropExÏûÏ¢ÊDZØÐëµÄ£¬·ñÔòOnDropº¯Êý²»»á±»Ö´ÐÐ

//µ±È»Ò²¿ÉÒÔÔÚOnDropExº¯ÊýÖд¦ÀíÊý¾Ý

	virtual DROPEFFECT OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject,

		DWORD dwKeyState, CPoint point);

	virtual DROPEFFECT OnDragOver(CWnd* pWnd, COleDataObject* pDataObject,

		DWORD dwKeyState, CPoint point);

	virtual BOOL OnDrop(CWnd* pWnd, COleDataObject* pDataObject,

		DROPEFFECT dropEffect, CPoint point);

	virtual DROPEFFECT OnDropEx(CWnd* pWnd, COleDataObject* pDataObject,

		DROPEFFECT dropEffect, DROPEFFECT dropEffectList, CPoint point);

	virtual void OnDragLeave(CWnd* pWnd);

};



#endif // !defined(AFX_OLEDROPTARGETEX_H__I_LOVE_MY_MOTHERLAND)



OleDropTargetEx.cpp


// OleDropTargetEx.cpp: implementation of the COleDropTargetEx class.

//

//////////////////////////////////////////////////////////////////////



#include "stdafx.h"

#include "LAD EDIT.h"

//#include "OleDropTargetEx.h"



#ifdef _DEBUG

#undef THIS_FILE

static char THIS_FILE[]=__FILE__;

#define new DEBUG_NEW

#endif



//////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////

//COleDropInfo Construction/Destruction

IMPLEMENT_DYNAMIC( COleDropInfo, CObject );



COleDropInfo::COleDropInfo()

{

	m_pDataObject = NULL;

	m_dwKeyState = 0;

	m_dropEffect = (DROPEFFECT)-1;

	m_dropEffectList = DROPEFFECT_NONE;

}



COleDropInfo::COleDropInfo(COleDataObject* pDataObject,DWORD dwKeyState,

				DROPEFFECT dropEffect,DROPEFFECT dropEffectList,CPoint point )

{

	m_pDataObject = pDataObject;

	m_dwKeyState = dwKeyState;

	m_dropEffect = dropEffect;

	m_dropEffectList = dropEffectList;

	m_point = point;

}



COleDropInfo::~COleDropInfo()

{

	m_pDataObject = NULL;

}



//////////////////////////////////////////////////////////////////////

//COleDropTargetEx Construction/Destruction

COleDropTargetEx::COleDropTargetEx()

{

}



COleDropTargetEx::~COleDropTargetEx()

{

}



//////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////

DROPEFFECT COleDropTargetEx::OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject,

			DWORD dwKeyState, CPoint point)

{

	ASSERT_VALID(this);

	ASSERT(::IsWindow(pWnd->m_hWnd));



	if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class

		return COleDropTarget::OnDragEnter(pWnd,pDataObject, dwKeyState, point);



	COleDropInfo DropInfo( pDataObject, dwKeyState, 0, 0, point );

	

	return ::SendMessage( pWnd->GetSafeHwnd(), DROPM_DRAGENTER, (WPARAM)&DropInfo, 0 );

}



DROPEFFECT COleDropTargetEx::OnDragOver(CWnd* pWnd, COleDataObject* pDataObject,

			DWORD dwKeyState, CPoint point)

{

	ASSERT_VALID(this);

	ASSERT(::IsWindow(pWnd->m_hWnd));



	if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class

		return COleDropTarget::OnDragOver(pWnd,pDataObject, dwKeyState, point);

	

	COleDropInfo DropInfo( pDataObject, dwKeyState, 0, 0, point );



	return ::SendMessage( pWnd->GetSafeHwnd(), DROPM_DRAGOVER, (WPARAM)&DropInfo, 0 );

}



BOOL COleDropTargetEx::OnDrop(CWnd* pWnd, COleDataObject* pDataObject,

			DROPEFFECT dropEffect, CPoint point)

{

	ASSERT_VALID(this);

	ASSERT(::IsWindow(pWnd->m_hWnd));



	if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class

		return COleDropTarget::OnDrop(pWnd, pDataObject,dropEffect,point);



	COleDropInfo DropInfo( pDataObject, 0, dropEffect, 0, point );



	return ::SendMessage( pWnd->GetSafeHwnd(), DROPM_DROP, (WPARAM)&DropInfo, 0 );

}



DROPEFFECT COleDropTargetEx::OnDropEx(CWnd* pWnd, COleDataObject* pDataObject,

			DROPEFFECT dropEffect, DROPEFFECT dropEffectList, CPoint point)

{

	ASSERT_VALID(this);

	ASSERT(::IsWindow(pWnd->m_hWnd));



	if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class

		return COleDropTarget::OnDropEx( pWnd, pDataObject, dropEffect, dropEffectList, point) ;



	COleDropInfo DropInfo( pDataObject, 0, dropEffect, dropEffectList, point );



	return ::SendMessage( pWnd->GetSafeHwnd(), DROPM_DROPEX, (WPARAM)&DropInfo, 0 );

}



void COleDropTargetEx::OnDragLeave(CWnd* pWnd)

{

	ASSERT_VALID(this);

	ASSERT(::IsWindow(pWnd->m_hWnd));



	if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class

	{

		COleDropTarget::OnDragLeave( pWnd );

		return;

	}



	::SendMessage( pWnd->GetSafeHwnd(), DROPM_DRAGLEAVE, 0, 0 );



	return;

}
海盗医生 2011-05-04
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WIN32拖拽

扩展COleDropTarget，重写以下虚方法：
virtual DROPEFFECT OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject,
DWORD dwKeyState, CPoint point);
virtual DROPEFFECT OnDragOver(CWnd* pWnd, COleDataObject* pDataObject,
DWORD dwKeyState, CPoint point);
virtual BOOL OnDrop(CWnd* pWnd, COleDataObject* pDataObject,
DROPEFFECT dropEffect, CPoint point);
virtual DROPEFFECT OnDropEx(CWnd* pWnd, COleDataObject* pDataObject,
DROPEFFECT dropEffect, DROPEFFECT dropEffectList, CPoint point);
virtual void OnDragLeave(CWnd* pWnd);
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