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// --------------------------------------------------------------------------------------------------------------------
// <copyright file="ListBoxHelper.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>
// A Helper for the ListBox control to provide SelectedItems functionality.
// </summary>
// --------------------------------------------------------------------------------------------------------------------
namespace HandBrakeWPF.Helpers
{
using System.Collections;
using System.Windows;
using System.Windows.Controls;
/// <summary>
/// A Helper for the ListBox control to provide SelectedItems functionality.
/// </summary>
public class ListBoxHelper
{
/// <summary>
/// SelectedItems Attached Dependency Property
/// </summary>
public static readonly DependencyProperty SelectedItemsProperty =
DependencyProperty.RegisterAttached("SelectedItems", typeof(IList), typeof(ListBoxHelper), new FrameworkPropertyMetadata(null, OnSelectedItemsChanged));
/// <summary>
/// Gets the SelectedItems property. This dependency property
/// indicates ....
/// </summary>
/// <param name="item">
/// The item.
/// </param>
/// <returns>
/// The get selected items.
/// </returns>
public static IList GetSelectedItems(DependencyObject item)
{
return (IList)item.GetValue(SelectedItemsProperty);
}
/// <summary>
/// Sets the SelectedItems property. This dependency property
/// indicates ....
/// </summary>
/// <param name="item">
/// The item.
/// </param>
/// <param name="value">
/// The value.
/// </param>
public static void SetSelectedItems(DependencyObject item, IList value)
{
item.SetValue(SelectedItemsProperty, value);
}
/// <summary>
/// Handles changes to the SelectedItems property.
/// </summary>
/// <param name="item">
/// The item.
/// </param>
/// <param name="e">
/// The DependencyPropertyChangedEventArgs.
/// </param>
private static void OnSelectedItemsChanged(DependencyObject item, DependencyPropertyChangedEventArgs e)
{
ListBox listBox = item as ListBox;
if (listBox != null)
{
ResetSelectedItems(listBox);
listBox.SelectionChanged += delegate { ResetSelectedItems(listBox); };
}
}
/// <summary>
/// Reset Selected Items
/// </summary>
/// <param name="listBox">
/// The list box.
/// </param>
private static void ResetSelectedItems(ListBox listBox)
{
IList selectedItems = GetSelectedItems(listBox);
selectedItems.Clear();
if (listBox.SelectedItems != null)
{
foreach (var item in listBox.SelectedItems)
selectedItems.Add(item);
}
}
}
}
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