ctreectrl向clistctrl拖放.doc

Ctreectrl 向 cListctrl拖放1） 首先需要定制全局变量 CImageListm_Image;CImageList* m_pDragImage;BOOLm_bDragging;HTREEITEMm_hDragItem, m_hDropItem;intm_nDropIndex;CWnd*m_pDropWnd;以及afx_msg void OnLButtonUp(UINT nFlags, CPoint point);afx_msg void OnMouseMove(UINT nFlags, CPoint point);afx_msg void OnBeginDrag (NMHDR* pnmhdr, LRESULT* pResult);void DropItemOnList (CListCtrl* pList);四个函数。前边的都是需要在.h文件中写的。ON_WM_LBUTTONUP()ON_WM_MOUSEMOVE()ON_NOTIFY_REFLECT(LVN_BEGINDRAG, OnBegindrag)这是前边三个函数对应的消息。这些需要在.CPP中写的。2）void CMyDlg:OnBeginDrag (NMHDR* pnmhdr, LRESULT* pResult)/ create a drag image/ Added 7/29/96NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pnmhdr;m_hDragItem = pNMTreeView-itemNew.hItem;m_pDragImage = m_treectrl.CreateDragImage (m_hDragItem); /函数为项创建拖拉图象列表/ changes the cursor to the drag image (DragMove() is still required in / OnMouseMove()m_pDragImage-BeginDrag (0, CPoint (8, 8); /此函数开始拖动一个图像m_pDragImage-DragEnter (GetDesktopWindow (), (NM_TREEVIEW *)pnmhdr)-ptDrag); / 拖动操作中，封锁对pWndLock确定的窗口的更新，在由point确定的位置显示拖动图象/ set dragging flagm_bDragging = TRUE;m_hDropItem = NULL;m_nDropIndex = -1;m_pDropWnd = &m_treectrl; /m_treectrl为控件变量/ capture all mouse messagesSetCapture ();void CMyDlg:OnMouseMove(UINT nFlags, CPoint point) if ( TRUE = m_bDragging)CPoint pt (point);ClientToScreen (&pt);/ move the drag imageVERIFY (m_pDragImage-DragMove (pt); /此函数移动在拖放操作中正被拖动的图象/ unlock window updatesVERIFY (m_pDragImage-DragShowNolock (FALSE); /确定是否显示拖动图象。 / get the CWnd pointer of the window that is under the mouse cursorCWnd* pDropWnd = WindowFromPoint (pt); /获得包含指定点的窗口的句柄ASSERT (pDropWnd);/ if we drag outside current windowif (pDropWnd != m_pDropWnd)/ turn off drag hilite for tree controlif (m_hDropItem)(CTreeCtrl*)m_pDropWnd)-SelectDropTarget (NULL); /此成员函数用指明一次拖放操作的目标的风格来重画该项m_hDropItem = NULL;/ turn off drag hilite for list controlif (m_nDropIndex != -1) CListCtrl* pList = (CListCtrl*)m_pDropWnd;VERIFY (pList-SetItemState (m_nDropIndex, 0, LVIS_DROPHILITED);/ redraw itemVERIFY (pList-RedrawItems (m_nDropIndex, m_nDropIndex);pList-UpdateWindow ();m_nDropIndex = -1;/ save current window pointerm_pDropWnd = pDropWnd;/ convert from screen coordinates to drop target client coordinatespDropWnd-ScreenToClient (&pt);/ if window is CTreeCtrlif (pDropWnd-IsKindOf (RUNTIME_CLASS (CTreeCtrl)UINT uFlags;/ get the item that is below cursorm_hDropItem = (CTreeCtrl*)pDropWnd)-HitTest (pt, &uFlags);/ highlight it(CTreeCtrl*)pDropWnd)-SelectDropTarget (m_hDropItem);else if (pDropWnd-IsKindOf (RUNTIME_CLASS (CListCtrl)UINT uFlags;CListCtrl* pList = (CListCtrl*)pDropWnd;/ unhilight previous itempList-SetItemState (m_nDropIndex, 0, LVIS_DROPHILITED);/ redraw previous itempList-RedrawItems (m_nDropIndex, m_nDropIndex);/ get the item that is below cursorm_nDropIndex = (CListCtrl*)pDropWnd)-HitTest (pt, &uFlags); / highlight itpList-SetItemState (m_nDropIndex, LVIS_DROPHILITED, LVIS_DROPHILITED);/ redraw itempList-RedrawItems (m_nDropIndex, m_nDropIndex);pList-UpdateWindow (); /更新/ lock window updatesVERIFY (m_pDragImage-DragShowNolock (TRUE);CDialog:OnMouseMove(nFlags, point);void CMyDlg:DropItemOnList (CListCtrl* pDropList)/ unhilite the drop targetpDropList-SetItemState (m_nDropIndex, 0, LVIS_DROPHILITED);char szLabel256;TV_ITEM tvi;tvi.hItem = m_hDragItem;tvi.mask = TVIF_IMAGE | TVIF_SELECTEDIMAGE | TVIF_TEXT | TVIF_HANDLE;tvi.pszText= szLabel;tvi.cchTextMax = 255;/ get item that was draggedVERIFY (m_treectrl.GetItem (&tvi);int iIndex = (m_nDropIndex = -1) ? pDropList-GetItemCount () : m_nDropIndex;/ insert item into CListCtrlVERIFY (-1 != pDropList-InsertItem (LVIF_IMAGE | LVIF_TEXT, iIndex, tvi.pszText,0, 0, tvi.iImage, 0L);/ select the new item we just insertedVERIFY (pDropList-SetItemState (iIndex, LVIS_SELECTED | LVIS_FOCUSED, LVIS_SELECTED | LVIS_FOCUSED);/ delete the original item (move operation)/VERIFY (m_treectrl.DeleteItem (m_hDragItem);void CMyDlg:OnLButtonUp(UINT nFlags, CPoint point) if ( TRUE = m_bDragging)/ end draggingVERIFY (m_pDragImage-DragLeave (GetDesktopWindow (); /解锁由pWndLock确定的窗口并隐藏拖动图象，允许窗口更新m_pDragImage-EndDrag ();/ stop intercepting all mouse messagesVERIFY (:ReleaseCapture ();m_bDragging = FALSE;CPoint pt (point);ClientToScreen (&pt);/ get the CWnd pointer of the window that is under the mouse cursorCWnd* pDropWnd = Windo