Force TreeViewAdv node to stay in edit mode

Question

How can I force a tree node to stay in edit mode?

After I add a new node to a tree, I invoke TreeViewAdv.BeginEdit(MyNewNode) to force the user to type in a new name for the node. I also use the NodeEditorValidating event handler to ensure that the name is unique. My event handler looks like this:

if (NewNameIsNotUnique(e.Label))
{
	MessageBox.Show(“Name is not unique”);
	TreeViewAdv.BeginEdit(e.Node);
}


What I’m trying to do is to leave the node in editing mode until the user enters a unique name. But instead, when the event handler exits, the node leaves editing mode. This can leave a non-unique node name (which is bad for me).

The BeginEdit method doesn’t seem to have any effect. The node is no longer in edit mode when this function completes.
 
If I invoke TreeViewAdv.EndEdit(false) before calling BeginEdit (or instead of calling BeginEdit), then the NodeEditorValidating function is reinvoked in an infinite loop.

Any ideas on how to keep the user from leaving a node that’s in edit mode until they’ve entered a valid (in my case, that means unique) node name?

Deepa TS · Answer

Hi Jzucker,

Please refer to the sample attached with this, that shows how you could accomplish the above by handling the TreeViewAdv''s NodeEditorValidating eventas shown below :

private void treeViewAdv1_NodeEditorValidating_1(object sender, Syncfusion.Windows.Forms.Tools.TreeNodeAdvCancelableEditEventArgs e)
{
if(e.Label=="Syncfusion")
{
e.Cancel = false;
MessageBox.Show("Unique");
e.ContinueEditing = false;
}
else
{
// Cancel the label edit action, inform the user, and place the node in edit mode again. //
e.Cancel = true;
MessageBox.Show("Name is not unique");
// To end editing mode, do this:
e.ContinueEditing = true;
}
}
Let me know if this meets your requirements.
Thanks for your continued interest in Syncfusion products.

Regards,
  
Deepa.T.Stest13.zip

Jon Zucker · Answer

Well, it sort of works.

When I run the sample code in the sample project you provided, it works perfectly. 

But when I use the same code in my own project, I still get stuck in an infinite loop. The tree''s NodeEditorValidating event is fired again after I exit the event handler, but I don''t know why. I''m still looking into that. Thanks for your help.