/// <summary>
/// focus on a node.
/// </summary>
/// <param name="node"></param>
public void FocusOn(Node node)
{
var parent = node.Parent ?? Root;
var oldFocusList = FocusList;
FocusList = parent.ChildNodeList;
if (oldFocusList == FocusList)
{
FocusList.SelectItem(node);
}
else
{
if (oldFocusList != null)
{
oldFocusList.SelectionChanged -= FocusList_SelectionChanged;
}
if (node != null)
{
FocusList.SelectItem(node);
}
FocusList.SelectionChanged += FocusList_SelectionChanged;
OnFocusNodeChanged?.Invoke(FocusList, new FocusNodeChangedArgs {
SelectedNode = FocusList.SelectedItem, DeselectNode = oldFocusList?.SelectedItem
});
}
}
/// <summary>
/// on the focus item changed.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FocusList_SelectionChanged(object sender, SelectableList <Node> .SelectChangedEventArgs e)
{
OnFocusNodeChanged?.Invoke(sender, new FocusNodeChangedArgs {
SelectedNode = e.SelectItem, DeselectNode = e.DeselectItem
});
}
