1 files changed, 145 insertions, 0 deletions
diff --git a/win/CS/HandBrakeWPF/AttachedProperties/MenuItemExtensions.cs b/win/CS/HandBrakeWPF/AttachedProperties/MenuItemExtensions.cs
new file mode 100644
index 000000000..e08cf59c6
--- /dev/null
+++ b/win/CS/HandBrakeWPF/AttachedProperties/MenuItemExtensions.cs
@@ -0,0 +1,145 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="MenuItemExtensions.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>
+//   Defines the MenuItemExtensions type.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace HandBrakeWPF.AttachedProperties
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Windows;
+    using System.Windows.Controls;
+
+    /// <summary>
+    /// The menu item extensions.
+    /// </summary>
+    public class MenuItemExtensions : DependencyObject
+    {
+        #region Constants and Fields
+
+        /// <summary>
+        /// The group name property.
+        /// </summary>
+        public static readonly DependencyProperty GroupNameProperty = DependencyProperty.RegisterAttached(
+            "GroupName", 
+            typeof(string), 
+            typeof(MenuItemExtensions), 
+            new PropertyMetadata(String.Empty, OnGroupNameChanged));
+
+        /// <summary>
+        /// The element to group names.
+        /// </summary>
+        public static Dictionary<MenuItem, String> ElementToGroupNames = new Dictionary<MenuItem, String>();
+
+        #endregion
+
+        #region Public Methods
+
+        /// <summary>
+        /// The get group name.
+        /// </summary>
+        /// <param name="element">
+        /// The element.
+        /// </param>
+        /// <returns>
+        /// The group name as a string.
+        /// </returns>
+        public static string GetGroupName(MenuItem element)
+        {
+            return element.GetValue(GroupNameProperty).ToString();
+        }
+
+        /// <summary>
+        /// The set group name.
+        /// </summary>
+        /// <param name="element">
+        /// The element.
+        /// </param>
+        /// <param name="value">
+        /// The value.
+        /// </param>
+        public static void SetGroupName(MenuItem element, string value)
+        {
+            element.SetValue(GroupNameProperty, value);
+        }
+
+        #endregion
+
+        #region Methods
+
+        /// <summary>
+        /// The menu item checked.
+        /// </summary>
+        /// <param name="sender">
+        /// The sender.
+        /// </param>
+        /// <param name="e">
+        /// The e.
+        /// </param>
+        private static void MenuItemChecked(object sender, RoutedEventArgs e)
+        {
+            var menuItem = e.OriginalSource as MenuItem;
+            foreach (var item in ElementToGroupNames)
+            {
+                if (item.Key != menuItem && item.Value == GetGroupName(menuItem))
+                {
+                    item.Key.IsChecked = false;
+                }
+            }
+        }
+
+        /// <summary>
+        /// The on group name changed.
+        /// </summary>
+        /// <param name="d">
+        /// The d.
+        /// </param>
+        /// <param name="e">
+        /// The e.
+        /// </param>
+        private static void OnGroupNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            MenuItem menuItem = d as MenuItem;
+
+            if (menuItem != null)
+            {
+                string newGroupName = e.NewValue.ToString();
+                string oldGroupName = e.OldValue.ToString();
+                if (string.IsNullOrEmpty(newGroupName))
+                {
+                    RemoveCheckboxFromGrouping(menuItem);
+                }
+                else
+                {
+                    if (newGroupName != oldGroupName)
+                    {
+                        if (!string.IsNullOrEmpty(oldGroupName))
+                        {
+                            RemoveCheckboxFromGrouping(menuItem);
+                        }
+                        ElementToGroupNames.Add(menuItem, e.NewValue.ToString());
+                        menuItem.Checked += MenuItemChecked;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// The remove checkbox from grouping.
+        /// </summary>
+        /// <param name="checkBox">
+        /// The check box.
+        /// </param>
+        private static void RemoveCheckboxFromGrouping(MenuItem checkBox)
+        {
+            ElementToGroupNames.Remove(checkBox);
+            checkBox.Checked -= MenuItemChecked;
+        }
+
+        #endregion
+    }
+}
+\ No newline at end of file