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// --------------------------------------------------------------------------------------------------------------------
// <copyright file="TreeViewHelper.cs" company="HandBrake Project (http://handbrake.fr)">
// This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
// Helper functions for handling <see cref="TimeSpan" /> structures
// Based of https://social.technet.microsoft.com/wiki/contents/articles/18188.wpf-treeview-selecteditem-twoway-mvvm-plus-expand-to-selected-and-close-all-others.aspx
// </summary>
// --------------------------------------------------------------------------------------------------------------------
namespace HandBrakeWPF.Helpers
{
using System.Windows;
using System.Windows.Controls;
public class TreeViewHelper
{
public static object GetTreeViewSelectedItem(DependencyObject obj)
{
return (object)obj.GetValue(TreeViewSelectedItemProperty);
}
public static void SetTreeViewSelectedItem(DependencyObject obj, object value)
{
obj.SetValue(TreeViewSelectedItemProperty, value);
}
public static readonly DependencyProperty TreeViewSelectedItemProperty =
DependencyProperty.RegisterAttached("TreeViewSelectedItem", typeof(object), typeof(TreeViewHelper), new PropertyMetadata(new object(), TreeViewSelectedItemChanged));
private static void TreeViewSelectedItemChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
TreeView treeView = sender as TreeView;
if (treeView == null)
{
return;
}
treeView.SelectedItemChanged -= TreeView_SelectedItemChanged;
treeView.SelectedItemChanged += TreeView_SelectedItemChanged;
TreeViewItem thisItem = treeView.ItemContainerGenerator.ContainerFromItem(e.NewValue) as TreeViewItem;
if (thisItem != null)
{
thisItem.IsSelected = true;
return;
}
for (int i = 0; i < treeView.Items.Count; i++)
{
if (SelectItem(e.NewValue, treeView.ItemContainerGenerator.ContainerFromIndex(i) as TreeViewItem))
{
return; // Break out the loop. We've found the item and expanded it's parent if necessary.
}
}
}
private static void TreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
TreeView treeView = sender as TreeView;
SetTreeViewSelectedItem(treeView, e.NewValue);
}
private static bool SelectItem(object o, TreeViewItem parentItem)
{
if (parentItem == null)
{
return false;
}
bool found = false;
foreach (var item in parentItem.Items)
{
if (item.Equals(o))
{
found = true;
break;
}
}
if (found)
{
bool isExpanded = parentItem.IsExpanded;
if (!isExpanded)
{
parentItem.IsExpanded = true;
parentItem.UpdateLayout();
}
}
return found;
}
}
}
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