如何在鼠标仍然按下时防止Winforms Listview中MouseUp事件的立即触发？

Question

如何在鼠标仍然按下时防止Winforms Listview中MouseUp事件的立即触发？

c#.netwinformslistviewevents

3

如果您启用了多选功能的标准Listview，则鼠标上下事件将正常工作。

但是，如果您关闭多选并在Listview上按住鼠标按钮，则它会立即在鼠标按钮仍然按下时触发下和上事件。

有没有办法防止这种情况发生？我只想在释放鼠标按钮时触发鼠标松开事件。

- Joan Venge

1个回答

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- Reza Aghaei · Accepted Answer

WndProc中的ListView鼠标事件处理有些复杂。通过重写OnMouseUp和WndProc来停止触发不必要的MouseUp事件，这是我所能做的。

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);
    }
}