如何防止立即触发的MouseUp事件在Winforms列表视图，当鼠标仍下?

Question

基本上，如果你有一个标准的Listview，打开了多重选择，鼠标上下事件工作良好。

但是如果你关闭了多重选择并在列表视图上点击并按住鼠标按钮，它会在鼠标按钮仍按下时立即触发向下和向上事件。

有办法防止这种情况吗?我只希望鼠标向上事件在我释放鼠标按钮时触发。

Answer 1

WndProc中的ListView鼠标事件处理有点复杂。这就是我可以通过重写OnMouseUp和WndProc来停止引发不必要的MouseUp:

using System.Collections.Specialized;
using System.Reflection;
using System.Windows.Forms;
public class MyListView : ListView
{
const int WM_LBUTTONUP = 0x0202, WM_RBUTTONUP = 0x0205, WM_MBUTTONUP = 0x0208;
const int LISTVIEWSTATE_mouseUpFired = 0x00080000;
FieldInfo listViewStateField;
public MyListView()
{
listViewStateField = (typeof(ListView)).GetField("listViewState",
BindingFlags.NonPublic | BindingFlags.Instance);
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_LBUTTONUP || m.Msg == WM_MBUTTONUP || m.Msg == WM_RBUTTONUP) {
var value = (BitVector32)listViewStateField.GetValue(this);
value[LISTVIEWSTATE_mouseUpFired] = true;
listViewStateField.SetValue(this, value);
var x = (m.LParam.ToInt32() & 0xffff);
var y = (m.LParam.ToInt32() >> 16) & 0xffff;
var e = new MouseEventArgs(
m.Msg == WM_LBUTTONUP ? MouseButtons.Left :
m.Msg == WM_MBUTTONUP ? MouseButtons.Middle :
MouseButtons.Right, 1, x, y, 0);
OnMouseUp(e);
}
base.WndProc(ref m);
}
protected override void OnMouseUp(MouseEventArgs e)
{
if (Control.MouseButtons == MouseButtons.None)
base.OnMouseUp(e);
}
}