现在到目录树视了：
为了能访问需要的成员变量，我们还是先定义了一个帮助函数从而可以轻易的访问我们的app类：
CMyApp *CMyTreeView::GetApp()
{
return ( (CMyApp*)AfxGetApp() );
} |
三个消息处理函数：
ON_WM_LBUTTONUP()
ON_WM_MOUSEMOVE()
ON_NOTIFY_REFLECT(LVN_BEGINDRAG, OnBegindrag) |
把这个视所能设置的元素都设成是开始拖的状态，而目的视也许是本身，或是别的视。
void CMyTreeView::OnBegindrag(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW *pTreeView = (NM_TREEVIEW*)pNMHDR;
*pResult = 0;
//获得指向树型控件的指针:
CTreeCtrl &cTree = GetTreeCtrl();
GetApp()->cTreeItemDrag = pTreeView->itemNew.hItem;
GetApp()->cTreeItemDrop = NULL;
//建立一个被拖的条目的图象:
GetApp()->cpDragImage = cTree.CreateDragImage(GetApp()->cTreeItemDrag);
GetApp()->cpDragImage->BeginDrag(0, CPoint(-15,-15));
POINT pt = pTreeView->ptDrag;
ClientToScreen( &pt );
GetApp()->cpDragImage->DragEnter(NULL, pt);
//初始化:
GetApp()->cDragging = TRUE;
GetApp()->cpDragWnd = &cTree;
GetApp()->cpDropWnd = NULL;
}
void CMyTreeView::OnMouseMove(UINT nFlags, CPoint point)
{
HTREEITEM hitem;
UINT flags;
//获得指向树型控件的指针:
CTreeCtrl &cTree = GetTreeCtrl();
//如果是正在被拖动的话：
if ( GetApp()->cDragging )
{
POINT pt = point;
ClientToScreen( &pt );
//移动图象:
GetApp()->cpDragImage->DragMove(pt);
if ( (hitem = cTree.HitTest(point, &flags)) != NULL )
{
GetApp()->cpDragImage->DragShowNolock(FALSE);
cTree.SelectDropTarget(hitem);
GetApp()->cTreeItemDrop = hitem;
GetApp()->cpDragImage->DragShowNolock(TRUE);
}
}
CTreeView::OnMouseMove(nFlags, point);
}
void CMyTreeView::OnLButtonUp(UINT nFlags, CPoint point)
{
//获得指向树型控件的指针:
CTreeCtrl &cTree = GetTreeCtrl();
CTreeView::OnLButtonUp(nFlags, point);
//I如果是正在被拖动的话:
if ( GetApp()->cDragging )
{
//不再拖动了:
GetApp()->cDragging = FALSE;
GetApp()->cpDragImage->DragLeave(this);
GetApp()->cpDragImage->EndDrag();
delete GetApp()->cpDragImage;
cTree.SelectDropTarget(NULL);
//验证被拖动的图象已被放下：
GetApp()->cDropPoint = point;
ClientToScreen(&GetApp()->cDropPoint);
GetApp()->cpDropWnd = WindowFromPoint(GetApp()->cDropPoint);
//选择拖动目的资源的类型:
if ( GetApp()->cpDragWnd->IsKindOf(RUNTIME_CLASS(CListView)) )
{
AfxMessageBox("source is list view", MB_OK);
}
else
if ( GetApp()->cpDragWnd->IsKindOf(RUNTIME_CLASS(CTreeView)) )
{
AfxMessageBox("source is treeview", MB_OK);
}
else
AfxMessageBox("source is something else", MB_OK);
}
} |
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