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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.Windows.Controls.Primitives;
using System.Windows;
using System.Windows.Controls;
namespace Xceed.Wpf.AvalonDock.Controls
{
public class DropDownButton : ToggleButton
{
#region Constructors
public DropDownButton()
{
this.Unloaded += new RoutedEventHandler( DropDownButton_Unloaded );
}
#endregion
#region Properties
#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
#endregion
#region Overrides
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();
}
#endregion
#region Private Methods
private void OnContextMenuClosed( object sender, RoutedEventArgs e )
{
//Debug.Assert(IsChecked.GetValueOrDefault());
var ctxMenu = sender as ContextMenu;
ctxMenu.Closed -= new RoutedEventHandler( OnContextMenuClosed );
IsChecked = false;
}
private 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;
}
}
#endregion
}
}
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