private void treeView_NodeExpandedChanging(object sender, RadTreeViewCancelEventArgs e)
{
if (this.groupedDateValues || !e.Node.Expanded)
{
return;
}
e.Cancel = true;
}
private void radTreeView1_NodeExpandedChanging(object sender, Telerik.WinControls.UI.RadTreeViewCancelEventArgs e)
{
RadTreeNodeCollection nodes = e.Node.Nodes;
foreach (RadTreeNode node in nodes)
{
node.ImageIndex = node.Level;
}
}
protected virtual void OnStructureTreeViewNodeRemoving(
object sender,
RadTreeViewCancelEventArgs e)
{
LayoutControlItemBase tag = e.Node.Tag as LayoutControlItemBase;
if (tag != null && tag.AllowDelete)
{
this.layoutControl.RemoveItem(tag);
tag.Dispose();
if (this.layoutControl.DragOverlay == null)
{
return;
}
this.layoutControl.DragOverlay.UpdatePreview(true);
}
else
{
e.Cancel = true;
}
}
public void Clear()
{
if (this.performClear || this.Items.Count == 0)
{
return;
}
this.performClear = true;
bool flag = true;
this.treeView.BeginUpdate();
for (int index = this.Items.Count - 1; index >= 0; --index)
{
RadTreeNode node = this.Items[index];
RadTreeViewCancelEventArgs args = new RadTreeViewCancelEventArgs(node, RadTreeViewAction.Unknown);
if (this.treeView.MultiSelect)
{
this.treeView.OnSelectedNodeChanging(args);
if (args.Cancel)
{
flag = false;
continue;
}
}
node.Selected = false;
this.Items.Remove(node);
if (this.treeView.MultiSelect)
{
this.treeView.OnSelectedNodeChanged(new RadTreeViewEventArgs(node));
}
}
this.treeView.EndUpdate(true, RadTreeViewElement.UpdateActions.StateChanged);
if (flag)
{
this.treeView.OnSelectedNodesCleared();
}
this.performClear = false;
}
