发表于 2009-1-5 19:48
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Drag & Drop & Background Image Tree Control
鍙戝竷: 2008-6-26 14:29 | 浣滆: admin | 鏌ョ湅: 26娆
涓嬭浇鏈枃鎵闄勬簮浠ｇ爜
绠浠
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浠ｇ爜缁嗚妭
鎵鏈夌殑瀹炵幇杩囩▼閮藉湪鏂囦欢cTree.cpp鍜宑Tree.h涓.
鎷栨嫿瀹炵幇涓昏鍦∣nBeginDrag()鍜孫nLButtonUp()鍑芥暟涓畬鎴. 鍦∣nBeginDrag鍑芥暟涓紝鎴戝垱寤轰簡涓涓狽M_TREEVIEW 缁撴瀯锛
void cTree::OnBeginDrag(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
*pResult = 0;
// So user cant drag root node
if (GetParentItem(pNMTreeView->itemNew.hItem) == NULL) return ;
// Item user started dragging ...
m_hitemDrag = pNMTreeView->itemNew.hItem;
m_hitemDrop = NULL;
// get the image list for dragging
m_pDragImage = CreateDragImage(m_hitemDrag);
// CreateDragImage() returns NULL if no image list
// associated with the tree view control
if( !m_pDragImage )
return;
m_bLDragging = TRUE;
m_pDragImage->BeginDrag(0, CPoint(-15,-15));
POINT pt = pNMTreeView->ptDrag;
ClientToScreen( &pt );
m_pDragImage->DragEnter(NULL, pt);
SetCapture();
}
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void cTree::OnMouseMove(UINT nFlags, CPoint point)
{
HTREE99vEM hitem;
UINT flags;
if (m_bLDragging)
{
POINT pt = point;
ClientToScreen(&pt);
CImageList::DragMove(pt);
if ((hitem = HitTest(point, &flags)) != NULL)
{
CImageList::DragShowNolock(FALSE);
// Tests if dragged item is over another child !
if ((GetParentItem(hitem) != NULL) && (cursor_no != ::GetCursor()))
{
::SetCursor(cursor_no);
// Dont want last selected target highlighted after mouse
// has moved off of it, do we now ?
SelectDropTarget(NULL);
}
// Is item we're over a root node and not parent root node ?
if ((GetParentItem(hitem) == NULL) && (GetParentItem(m_hitemDrag) != hitem ))
{
if (cursor_arr != ::GetCursor()) ::SetCursor(cursor_arr);
SelectDropTarget(hitem);
}
m_hitemDrop = hitem;
CImageList::DragShowNolock(TRUE);
}
}
else
{
// Set cursor to arrow if not dragged
