C＃：如何避免在双击事件上发生TreeNode检查
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所以我在C＃Windows窗体应用程序中有一个TreeView。我需要对某些节点进行“锁定”，以便基于参数无法对其进行检查（或取消检查）。
我现在正在做的是这样的：
private void tv_local_BeforeCheck(object sender, TreeViewCancelEventArgs e) {
TNode node = (TNode)e.Node;
//if a part node, cancel the action.
if (node.Type == \"Part\") {
e.Cancel = true;
}
//if a locked node, cancel the action
if (node.Locked == true) {
e.Cancel = true;
}
}
没有找到相关结果
已邀请:
4 个回复
誓猎贰
public class NoClickTree : TreeView { protected override void WndProc(ref Message m) { // Suppress WM_LBUTTONDBLCLK if (m.Msg == 0x203) { m.Result = IntPtr.Zero; } else base.WndProc(ref m); } };疼嘶桐
protected override void WndProc(ref Message m) { // Filter WM_LBUTTONDBLCLK when we\'re showing check boxes if (m.Msg == 0x203 && CheckBoxes) { // See if we\'re over the checkbox. If so then we\'ll handle the toggling of it ourselves. int x = m.LParam.ToInt32() & 0xffff; int y = (m.LParam.ToInt32() >> 16) & 0xffff; TreeViewHitTestInfo hitTestInfo = HitTest(x, y); if (hitTestInfo.Node != null && hitTestInfo.Location == TreeViewHitTestLocations.StateImage) { OnBeforeCheck(new TreeViewCancelEventArgs(hitTestInfo.Node, false, TreeViewAction.ByMouse)); hitTestInfo.Node.Checked = !hitTestInfo.Node.Checked; OnAfterCheck(new TreeViewEventArgs(hitTestInfo.Node, TreeViewAction.ByMouse)); m.Result = IntPtr.Zero; return; } } base.WndProc(ref m); }街茬
private void MyTreeView_MouseUp(object sender, MouseEventArgs e) { // HACK: avoid to check root nodes (mr) var node = ((TreeView)sender).GetNodeAt(new Point(e.X, e.Y)); if (node != null && node.Parent == null) BeginInvoke(new MouseEventHandler(TreeView_MouseUpAsync), sender, e); } private void TreeView_MouseUpAsync(object sender, MouseEventArgs e) { if (IsDisposed) return; var node = ((TreeView)sender).GetNodeAt(new Point(e.X, e.Y)); node.Checked = false; }嗓瑰