TreeView中不可选择的节点

Question

我在winform上有TreeView控件.我希望让几个节点无法选择.我怎么能得到这个.
在我看来只有一个想法 - 自定义绘制节点,但可能更容易存在？请指教

我已经在BeforeSelect事件处理程序中尝试了这样的代码:

private void treeViewServers_BeforeSelect(object sender, TreeViewCancelEventArgs e)
{
  if (e.Node.Parent != null)
  {
    e.Cancel = true;
  }
}

但它获得的效果是不合适的.当我按住鼠标左键时,节点临时获取选择.

提前致谢!

Answer 1

如果单击不可选择的节点,则可以完全禁用鼠标事件.

为此,您必须覆盖TreeView以下代码中显示的内容

public class MyTreeView : TreeView
{
    int WM_LBUTTONDOWN = 0x0201; //513
    int WM_LBUTTONUP = 0x0202; //514
    int WM_LBUTTONDBLCLK = 0x0203; //515

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_LBUTTONDOWN ||
           m.Msg == WM_LBUTTONUP ||
           m.Msg == WM_LBUTTONDBLCLK)
        {
            //Get cursor position(in client coordinates)
            Int16 x = (Int16)m.LParam;
            Int16 y = (Int16)((int)m.LParam >> 16);

            // get infos about the location that will be clicked
            var info = this.HitTest(x, y);

            // if the location is a node
            if (info.Node != null)
            {
                // if is not a root disable any click event
                if(info.Node.Parent != null)
                    return;//Dont dispatch message
            }
        }

        //Dispatch as usual
        base.WndProc(ref m);
    }
}