//...
static LayoutGroupControl GetParent(this ILayoutControl input, LayoutGroupControl parent = null)
{
if (parent == null)
{
if (ReferenceEquals(input.Root.Child, input))
{
return(null);
}
if (input.Root.Child is LayoutGroupControl i)
{
return(input.GetParent(i));
}
}
foreach (var i in parent.Children)
{
if (ReferenceEquals(i, input))
{
return(parent);
}
if (i is LayoutGroupControl j)
{
var result = input.GetParent(j);
if (result != null)
{
return(result);
}
}
}
return(null);
}
//...
public static void Delete(this ILayoutControl input)
{
var parent = input.GetParent();
if (parent == null)
{
Unsubscribe(input);
input.Root.Child = null;
return;
}
var index = input.GetIndex();
if (index == -1)
{
throw new IndexOutOfRangeException();
}
Unsubscribe(input);
parent.Children.RemoveAt(index);
//Remove the column or row definition
if (parent.Orientation == Orientation.Horizontal)
{
parent.ColumnDefinitions.RemoveAt(index);
}
if (parent.Orientation == Orientation.Vertical)
{
parent.RowDefinitions.RemoveAt(index);
}
if (parent.Children.Count > 0)
{
if (index >= parent.Children.Count)
{
index = parent.Children.Count - 1;
}
//Remove the grid splitter
if (index < parent.Children.Count)
{
if (parent.Children[index] is GridSplitter)
{
parent.Children.RemoveAt(index);
//Remove the column or row definition again
if (parent.Orientation == Orientation.Horizontal)
{
parent.ColumnDefinitions.RemoveAt(index);
}
if (parent.Orientation == Orientation.Vertical)
{
parent.RowDefinitions.RemoveAt(index);
}
}
}
}
//Reassign all column or row values
for (var i = 0; i < parent.Children.Count; i++)
{
if (parent.Orientation == Orientation.Horizontal)
{
Grid.SetColumn(parent.Children[i], i);
}
if (parent.Orientation == Orientation.Vertical)
{
Grid.SetRow(parent.Children[i], i);
}
}
//Remove the parent from it's own parent to avoid empty LayoutGroupControls
if (parent.Children.Count == 0)
{
parent.Delete();
}
}
//...
public static int GetIndex(this ILayoutControl input) => input.GetParent()?.Children.IndexOf(input as UIElement) ?? -1;
public static LayoutGroupControl GetParent(this ILayoutControl input) => input.GetParent(null);