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Src/Xceed.Wpf.AvalonDock/Controls/DropDownButton.cs

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+/*************************************************************************************
+
+   Extended WPF Toolkit
+
+   Copyright (C) 2007-2013 Xceed Software Inc.
+
+   This program is provided to you under the terms of the Microsoft Public
+   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 
+
+   For more features, controls, and fast professional support,
+   pick up the Plus Edition at http://xceed.com/wpf_toolkit
+
+   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
+
+  ***********************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Controls.Primitives;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Diagnostics;
+
+namespace Xceed.Wpf.AvalonDock.Controls
+{
+    public class DropDownButton : ToggleButton
+    {
+        public DropDownButton()
+        {
+          this.Unloaded += new RoutedEventHandler(DropDownButton_Unloaded);
+        }
+
+        #region DropDownContextMenu
+
+        /// <summary>
+        /// DropDownContextMenu Dependency Property
+        /// </summary>
+        public static readonly DependencyProperty DropDownContextMenuProperty =
+            DependencyProperty.Register("DropDownContextMenu", typeof(ContextMenu), typeof(DropDownButton),
+                new FrameworkPropertyMetadata((ContextMenu)null,
+                    new PropertyChangedCallback(OnDropDownContextMenuChanged)));
+
+        /// <summary>
+        /// Gets or sets the DropDownContextMenu property.  This dependency property 
+        /// indicates drop down menu to show up when user click on an anchorable menu pin.
+        /// </summary>
+        public ContextMenu DropDownContextMenu
+        {
+            get { return (ContextMenu)GetValue(DropDownContextMenuProperty); }
+            set { SetValue(DropDownContextMenuProperty, value); }
+        }
+
+        /// <summary>
+        /// Handles changes to the DropDownContextMenu property.
+        /// </summary>
+        private static void OnDropDownContextMenuChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            ((DropDownButton)d).OnDropDownContextMenuChanged(e);
+        }
+
+        /// <summary>
+        /// Provides derived classes an opportunity to handle changes to the DropDownContextMenu property.
+        /// </summary>
+        protected virtual void OnDropDownContextMenuChanged(DependencyPropertyChangedEventArgs e)
+        {
+            var oldContextMenu = e.OldValue as ContextMenu;
+            if (oldContextMenu != null && IsChecked.GetValueOrDefault())
+                oldContextMenu.Closed -= new RoutedEventHandler(OnContextMenuClosed);
+        }
+
+        #endregion
+
+        #region DropDownContextMenuDataContext
+
+        /// <summary>
+        /// DropDownContextMenuDataContext Dependency Property
+        /// </summary>
+        public static readonly DependencyProperty DropDownContextMenuDataContextProperty =
+            DependencyProperty.Register("DropDownContextMenuDataContext", typeof(object), typeof(DropDownButton),
+                new FrameworkPropertyMetadata((object)null));
+
+        /// <summary>
+        /// Gets or sets the DropDownContextMenuDataContext property.  This dependency property 
+        /// indicates data context to set for drop down context menu.
+        /// </summary>
+        public object DropDownContextMenuDataContext
+        {
+            get { return (object)GetValue(DropDownContextMenuDataContextProperty); }
+            set { SetValue(DropDownContextMenuDataContextProperty, value); }
+        }
+
+        #endregion
+
+        protected override void OnClick()
+        {
+            if (DropDownContextMenu != null)
+            {
+                //IsChecked = true;
+                DropDownContextMenu.PlacementTarget = this;
+                DropDownContextMenu.Placement = PlacementMode.Bottom;
+                DropDownContextMenu.DataContext = DropDownContextMenuDataContext;
+                DropDownContextMenu.Closed += new RoutedEventHandler(OnContextMenuClosed);
+                DropDownContextMenu.IsOpen = true;
+            }
+
+            base.OnClick();
+        }
+
+        void OnContextMenuClosed(object sender, RoutedEventArgs e)
+        {
+            //Debug.Assert(IsChecked.GetValueOrDefault());
+            var ctxMenu = sender as ContextMenu;
+            ctxMenu.Closed -= new RoutedEventHandler(OnContextMenuClosed);
+            IsChecked = false;
+        }
+
+        void DropDownButton_Unloaded(object sender, RoutedEventArgs e)
+        {
+          // When changing theme, Unloaded event is called, erasing the DropDownContextMenu.
+          // Prevent this on theme changes.
+          if( this.IsLoaded )
+          {
+            DropDownContextMenu = null;
+          }
+        }
+
+
+    }
+}