After removing one TreeNode I want the View to be at the node after the one I deleted (the same functionality should later also be implemented for editing a node), but currently it always shows the top of the list again and I need to scroll down manually, which can be quite irritating for the user.
I'm using the EnsureVisible() method but unfortunately it doesn't work (I'm testing it with a TreeView which contains about 30 nodes that don't have sub-nodes).
The code of the function (Only the first line and the last 4/5 lines are relevant, I think):
public override void Remove()
{
TreeNode moveToThisNode = treeControl1.SelectedNodes.Last().NextVisibleNode;
// first, group them by whether they are ObjectGroups or ObjectTypes
var grouping = from node in treeControl1.SelectedNodes
where !node.IsUngroupedNode()
let isGroup = node.IsGroupNode()
group node by isGroup into g
select new { IsGroupNode = g.Key, Items = g };
foreach (var grp in grouping)
{
foreach (var selectedNode in grp.Items)
{
// Only allow removal FIRSTLY of ObjectGroups and SECONDLY that are NOT the "ungrouped" group.
if (grp.IsGroupNode)
{
// Removes the Group
var cmd = (Commands.DataCommand<string>)mApplicationData.CommandFactory.Create(string.Concat(CommandPrefix, "Remove"));
cmd.Data = selectedNode.Text;
cmd.Execute();
}
else // ObjectType node --> just move to ungrouped
{
var t = (ObjectType)selectedNode.Tag;
var parentNode = selectedNode.Parent;
if (parentNode?.IsGroupNode() == true &&
parentNode?.IsUngroupedNode() == false) // No removal of ObjectTypes from within "ungrouped"
{
var group = (ObjectGroup)parentNode.Tag;
// Remove the ObjectType from the ObjectGroup but does not delete it -> becomes "ungrouped".
var cmd = (Commands.IGroupTypeCommand)mApplicationData.CommandFactory.Create(string.Concat(CommandPrefix, "TypeRemove"));
cmd.ObjectClass = t.Class;
cmd.ObjectTypeName = t.Name;
cmd.Data = group.Name;
cmd.Execute();
}
}
}
}
UpdateData();
if (moveToThisNode!=null)
{
moveToThisNode.EnsureVisible();
MessageBox.Show("Dummy test if moveToThisNode isn't null");
}
}
