silverlight实现多级右键菜单

Silverlight 4新增了右键菜单功能，通过contextMenu控件来实现右击菜单的功能.简单的右键菜单功能非常容易实现，网上很多朋友都有提供示例分享，最近因为项目需要得实现多级右键菜单功能，效果如下：

SuperMenuItem

using System;
using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;

namespace Demo
{
public class SuperMenuItem : MenuItem
{
#region Fields

private Popup popup;
public bool CanLeave { get; set; }

#endregion

#region Properties

public Visibility HasSubItems
{
get { return (Visibility)GetValue(HasSubItemsProperty); }
set { SetValue(HasSubItemsProperty, value); }
}

public static readonly DependencyProperty HasSubItemsProperty =
DependencyProperty.Register("HasSubItems", typeof(Visibility), typeof(SuperMenuItem), new PropertyMetadata(Visibility.Collapsed));

public bool IsSubmenuOpen
{
get { return (bool)GetValue(IsSubmenuOpenProperty); }
set { SetValue(IsSubmenuOpenProperty, value); }
}

public static readonly DependencyProperty IsSubmenuOpenProperty =
DependencyProperty.Register("IsSubmenuOpen", typeof(bool), typeof(SuperMenuItem), new PropertyMetadata(false));

#endregion

#region Constructor

public SuperMenuItem()
{
this.DefaultStyleKey = typeof(SuperMenuItem);
this.MouseEnter += new MouseEventHandler(parent_MouseEnter);
this.MouseLeave += new MouseEventHandler(SuperMenuItem_MouseLeave);
this.Click += new RoutedEventHandler(SuperMenuItem_Click);
this.CanLeave = true;
}

private void SuperMenuItem_Click(object sender, RoutedEventArgs e)
{
if (this.Parent != null && this.Parent is SuperMenuItem)
{
(this.Parent as SuperMenuItem).OnClick();
}
}

public override void OnApplyTemplate()
{
base.OnApplyTemplate();
popup = (Popup)this.GetTemplateChild("PART_Popup");
popup.Opened += new EventHandler(popup_Opened);
popup.Closed += new EventHandler(popup_Closed);
}

private void popup_Opened(object sender, EventArgs e)
{
this.CanLeave = false;
}

private void popup_Closed(object sender, EventArgs e)
{
if (this.HasSubItems == Visibility.Visible)
{
this.IsSubmenuOpen = false;
}
}

protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
if (e.NewItems.Count > 0)
{
this.HasSubItems = Visibility.Visible;
}
}

}

private void parent_MouseEnter(object sender, MouseEventArgs e)
{
this.CanLeave = true;
if (this.HasSubItems == Visibility.Visible)
{
this.IsSubmenuOpen = true;
}
if (this.Parent != null && this.Parent is ContextMenu)
{
foreach (var item in (this.Parent as ContextMenu).Items)
{
if (item != this)
{
(item as SuperMenuItem).IsSubmenuOpen = false;
}
}
}
}

private void SuperMenuItem_MouseLeave(object sender, MouseEventArgs e)
{
if (this.HasSubItems == Visibility.Visible)
{
if (CanLeave)
{
this.IsSubmenuOpen = false;
}
}
}

#endregion
}

}

所有源代码都已经附上，有需要的自己copy到项目中，不单独提供源代码下载。