/// <summary>
/// Collapses siblings of <param name="Item"/>.
/// </summary>
public static void CollapseSiblings(this TreeViewItem Item)
{
var Parent = Item.GetParent().As <FrameworkElement>();
while (!Parent.Is <TreeViewItem>())
{
if (Parent == null || Parent.Is <TreeView>())
{
break;
}
Parent = Parent.GetParent().As <FrameworkElement>();
}
ItemsControlExtensions.CollapseSiblings(Parent as ItemsControl, Item);
}
static void RegisterSelectNoneOnEmptySpaceClick(object sender, MouseButtonEventArgs e)
{
var ItemsControl = sender as ItemsControl;
if (ItemsControlExtensions.GetSelectNoneOnEmptySpaceClick(ItemsControl) && e.LeftButton == MouseButtonState.Pressed)
{
if ((ItemsControl is TreeView && !e.OriginalSource.Is <TreeViewItem>()) ||
(ItemsControl is DataGrid && !e.OriginalSource.Is <DataGridRow>()) ||
(ItemsControl is ListBox && !e.OriginalSource.Is <ListBoxItem>()))
{
ItemsControl.TryClearSelection();
}
}
}