Scroll selected TreeView node into view

Question

I have a System.Windows.Forms.TreeView docked inside a panel. I am setting a node selected programmatically. What method or property would I use to have the treeview scroll the selected into view?

Answer 1

node.EnsureVisible();

for example:

if(treeView.SelectedNode != null) treeView.SelectedNode.EnsureVisible();

(see MSDN)

Answer 2

I also had issues with this and figured out that treeview.ExpandAll() ignores the EnsureVisible() effect and avoids the scrolling to the node position.

Just call EnsureVisible() after ExpandAll() if you want a full expanded tree with the scroll on the node you've selected.

Answer 3

To ensure the visibility of selected item:

private void EnsureItemVisible()
{
    if(treeView1.SelectedNode == null)
    {
        return;
    }

    for (int i = treeView1.SelectedNode.Index + treeView1.VisibleCount / 2; i >= 0; i--)
    {
        if (treeView1.Nodes.Count > i && treeView1.Nodes[i] != null)
        {
            treeView1.Nodes[i].EnsureVisible();
            break;
        }
    }

    for (int i = treeView1.SelectedNode.Index - treeView1.VisibleCount / 2; i < treeView1.Nodes.Count; i++)
    {
        if (i >= 0 && treeView1.Nodes[i] != null)
        {
            treeView1.Nodes[i].EnsureVisible();
            break;
        }
    }
}

Handle the TreeView selection has been changed:

private void TreeView_AfterSelect(object sender, TreeViewEventArgs e)
{   
    EnsureItemVisible();
}