关于dropdownlist.Items.Clear()
的问题，不能清空内容
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[问题点数：200分，结帖人yoooyeeey]
关于dropdownlist.Items.Clear()
的问题，不能清空内容
在线急等～～～～～～
[问题点数：200分，结帖人yoooyeeey]
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本帖子已过去太久远了，不再提供回复功能。Drag and Drop Listbox Items Without OLE - 不使用 OLE 直接拖放 ListBox Items - 程序员小辉
Drag and Drop Listbox Items Without OLE - 不使用 OLE 直接拖放 ListBox Items
本程序实现 不使用 OLE 直接拖放 ListBox Items(Drag and Drop Listbox Items Without OLE), 如图：
作者 Ali Rafiee
MFC has a CDragListBox that virtually does the same thing. The advantage of this class over MFC's CDragListBox is that it allows the user to insert the item at the end of the list, whereas CDragListBox does not. The concept is very simple: Keep track of the item that is being dragged, indicate where the drop will be when the user is dragging the item around, and finally, insert the item in its new location once the user releases the mouse button.
To accomplish this task, you will need to catch three messages for your listbox window: WM_LBUTTONDOWN, WM_MOUSEMOVE, and WM_LBUTTONUP. The WM_LBUTTONDOWN handler method simply initializes the drag and drop process by finding the item that the user clicked on.
示例代码：
void CDragAndDropListBox::OnLButtonDown(UINT nFlags, CPoint point)
CListBox::OnLButtonDown(nFlags, point);
//clear all the flags
m_MovingIndex = LB_ERR;
m_MoveToIndex = LB_ERR;
m_Captured = FALSE;
m_Interval = 0;
//Find the item that they want to drag and keep track of it.
//Later in the mouse move, we will capture the mouse if this
//value is set.
int Index = ItemFromPoint(point,Outside);
if (Index != LB_ERR && !Outside)
m_MovingIndex = I
SetCurSel(Index);
void CDragAndDropListBox::OnMouseMove(UINT nFlags, CPoint point)
CListBox::OnMouseMove(nFlags, point);
if (nFlags & MK_LBUTTON)
if (m_MovingIndex != LB_ERR && !m_Captured)
SetCapture();
m_Captured = TRUE;
int Index = ItemFromPoint(point,Outside);
//if they our not on a particular item
if (Outside)
CRect ClientR
GetClientRect(&ClientRect);
//If they are still within the listbox window, simply
//select the last it else, if
//they are outside the window, scroll the items.
if (ClientRect.PtInRect(point))
KillTimer(TID_SCROLLDOWN);
KillTimer(TID_SCROLLUP);
m_Interval = 0;
//indicates that the user wants to drop the item
//at the end of the list
Index = LB_ERR;
Outside = FALSE;
DoTheScrolling(point,ClientRect);
KillTimer(TID_SCROLLDOWN);
KillTimer(TID_SCROLLUP);
m_Interval = 0;
if (Index != m_MoveToIndex && !Outside)
DrawTheLines(Index);
void CDragAndDropListBox::OnLButtonUp(UINT nFlags, CPoint point)
if (m_MovingIndex != LB_ERR && m_Captured)
KillTimer(TID_SCROLLDOWN);
KillTimer(TID_SCROLLUP);
m_Interval = 0;
m_Captured = FALSE;
ReleaseCapture();
GetClientRect(&Rect);
//if they are still within the listbox window
if (Rect.PtInRect(point))
InsertDraggedItem();
Invalidate();
UpdateWindow();
m_MovingIndex = LB_ERR;
m_MoveToIndex = LB_ERR;
CListBox::OnLButtonUp(nFlags, point);
// CDragDropListBoxSampleDlg dialog
class CDragDropListBoxSampleDlg : public CDialog
// Implementation
protected:
CDragAndDropListBox
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第 1 楼& tt 发表于
不错．正好我有用．多谢！
第 2 楼& yina 发表于
真的是非常感谢
第 3 楼& waterliy 发表于
拜托，我怎么就打不开啊。能下载不能打开工程，我用的ＶＣ６．０。是什么原因呢？
第 4 楼& qinyi 发表于
我今天下载了几个源码，非常感谢您的收集。
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