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有关CTreeCtrl拖拽的问题，请教！

huazaimh 2005-09-28 11:01:21

下面是有关拖拽的源代码，但是拖拽的时候拖拽的图标离鼠标有比较大的距离，不知道是怎么回事
各位大哥大姐能不能指点一下啊？？
void CXTreeCtrl::OnBegindrag(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here

*pResult = 0;

//Èç¹ûÊÇÎÞÒâÍÏÒ·£¬Ôò·ÅÆú²Ù×÷
if( (GetTickCount() - m_dwDragStart) < DRAG_DELAY )
return;

m_hItemDragS = pNMTreeView->itemNew.hItem;
m_hItemDragD = NULL;

//µÃµ½ÓÃÓÚÍÏ¶¯Ê±ÏÔÊ¾µÄÍ¼ÏóÁÐ±í
m_pDragImage = CreateDragImage( m_hItemDragS );
if( !m_pDragImage )
return;

m_bDragging = true;
m_pDragImage->BeginDrag ( 0, CPoint(8,8));
CPoint pt = pNMTreeView->ptDrag;
ClientToScreen( &pt );

m_pDragImage->DragEnter ( NULL,pt); //"this"½«ÍÏÒ·¶¯×÷ÏÞÖÆÔÚ¸Ã´°¿Ú
SetCapture();

m_nScrollTimerID = SetTimer( 2,40,NULL );

}

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dnliophsam 2006-03-22

标记一下，我也正好想学习

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雪7狼 2006-03-22

m_pDragImage->DragEnter ( NULL,pt);
改为m_pDragImage->DragEnter ( this,pt); //this"将拖曳动作限制在该窗口

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zwl327 2006-03-22

修改这两个值就行．

pt.x = pNMTreeView->ptDrag.x - (rect.left-16);
pt.y = pNMTreeView->ptDrag.y - rect.top;

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huazaimh 2005-10-12

这个帖子不能沉啊！
没有最后搞定呢！

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SanTa 2005-10-12

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luokun 2005-10-12

给你一个函数，你用它替代CreateDragImage试试。

CImageList* CreateDragImageEx(HTREEITEM hItem)
{
if(GetImageList(TVSIL_NORMAL) != NULL)
return CreateDragImage(hItem);

CRect rect;
GetItemRect(hItem, rect, TRUE);
rect.top = rect.left = 0;

// Create bitmap
CClientDC dc (this);
CDC memDC;

if(!memDC.CreateCompatibleDC(&dc))
return NULL;

CBitmap bitmap;
if(!bitmap.CreateCompatibleBitmap(&dc, rect.Width(), rect.Height()))
return NULL;

CBitmap* pOldMemDCBitmap = memDC.SelectObject( &bitmap );
CFont* pOldFont = memDC.SelectObject(GetFont());

memDC.FillSolidRect(&rect, RGB(0, 255, 0)); // Here green is used as mask color
memDC.SetTextColor(GetSysColor(COLOR_WINDOWTEXT));
memDC.TextOut(rect.left, rect.top, GetItemText(hItem));

memDC.SelectObject( pOldFont );
memDC.SelectObject( pOldMemDCBitmap );

// Create imagelist
CImageList* pImageList = new CImageList;
pImageList->Create(rect.Width(), rect.Height(),
ILC_COLOR | ILC_MASK, 0, 1);
pImageList->Add(&bitmap, RGB(0, 255, 0)); // Here green is used as mask color

return pImageList;
}

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goodboyws 2005-10-12

这是我以前写的相关代码你参考一下
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here
HTREEITEM hItem = pNMTreeView->itemNew.hItem;
int nData = m_cUserTree.GetItemData(hItem);
if (nData == -1)
{
*pResult = 0;
return;
}
m_hTreeItem = hItem;
m_pDragImageList = m_cUserTree.CreateDragImage(m_hTreeItem);
CRect rect;
if (m_pDragImageList)
{
SetCapture();
m_cUserTree.GetItemRect(m_hTreeItem, rect, TRUE);
CPoint pt;
pt.x = pNMTreeView->ptDrag.x - (rect.left-16);
pt.y = pNMTreeView->ptDrag.y - rect.top;
CImageList::DragShowNolock(TRUE);
m_pDragImageList->BeginDrag(0, pt);
CPoint ptAction;

GetCursorPos(&ptAction);
m_cUserTree.ScreenToClient(&ptAction);
CImageList::DragMove(ptAction);
m_cUserTree.SelectDropTarget(m_hTreeItem);
CImageList::DragEnter(&m_cUserTree, ptAction);
m_pWndLocked = &m_cUserTree;
m_bDrag = TRUE;
}
*pResult = 0;

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huazaimh 2005-10-02

上面的大哥，ClientToScreen( &pt )我也试过了，但是不行
可能是别的原因

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