Silverlight Menu4U

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Collections;

namespace Silverlight.Controls
{
    public class CustomListBox : ListBox
    {
        public delegate void CustomSelectionChangedDelegate(CustomListBox parentListBox, IEnumerable item, IEnumerable itemsSource, double stackedPosition, double width, double height);
        public delegate void ItemMouseLeftButtonDownDelegate(CustomListBox parentListBox, object item);

        public event CustomSelectionChangedDelegate CustomSelectionChanged;
        public event ItemMouseLeftButtonDownDelegate ItemMouseLeftButtonDown;

        Visibility headerVisibility = Visibility.Visible;

        Orientation orientation { get; set; }
        public int Level { get; private set; }
        public double HeaderHeight { get; private set; }
        public Visibility HeaderVisibility
        {
            get
            {
                return headerVisibility;
            }
            set
            {
                headerVisibility = value;
            }
        }

        public CustomListBox(int level, Orientation orientation)
        {
            this.SelectionChanged += new SelectionChangedEventHandler(CustomListBox_SelectionChanged);
            this.orientation = orientation;
            this.Level = level;
            this.HeaderVisibility = System.Windows.Visibility.Collapsed;
            this.HeaderHeight = 0;
            this.MouseEnter += new MouseEventHandler(CustomListBox_MouseEnter);
        }

        void CustomListBox_MouseEnter(object sender, MouseEventArgs e)
        {
            for (var i = 0; i < this.Items.Count; i++)
            {
                var container = (ListBoxItem)this.ItemContainerGenerator.ContainerFromIndex(i);
                if (container != null)
                {
                    container.MouseEnter -= new MouseEventHandler(container_MouseEnter);
                    container.MouseEnter += new MouseEventHandler(container_MouseEnter);

                    container.MouseMove -= new MouseEventHandler(container_MouseMove);
                    container.MouseMove += new MouseEventHandler(container_MouseMove);
                }
            }            
        }

        void container_MouseMove(object sender, MouseEventArgs e)
        {
            SelectItem(sender);
        }

        void container_MouseEnter(object sender, MouseEventArgs e)
        {
            SelectItem(sender);
        }

        private void SelectItem(object sender)
        {
            var container = (ListBoxItem)sender;
            dynamic item = this.ItemContainerGenerator.ItemFromContainer(container);
            var isEnabled = item.IsEnabled == null ? true : item.IsEnabled;
            var isSeparator = item.IsSeparator == null ? false : item.IsSeparator;

            if (isEnabled && !isSeparator)
            {
                if (this.SelectedItem != item)
                    this.SelectedItem = item;
            }
        }

        void CustomListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            IEnumerable itemsSource = null;
            Point nwPoint = new Point(0, 0);
            Point nePoint = new Point(0, 0);
            Point swPoint = new Point(0, 0);
            Point sePoint = new Point(0, 0);

            var stackedPosition = 0.0;
            var width = 0.0;
            var height = 0.0;
            ListBoxItem container = null;

            if (this.SelectedItem != null)
            {
                itemsSource = ((MenuItem)this.SelectedItem).Children;

                for (var i = 0; i <= this.SelectedIndex; i++)
                {
                    container = (ListBoxItem)this.ItemContainerGenerator.ContainerFromIndex(i);
                    var child = (FrameworkElement)VisualTreeHelper.GetChild(container, 0);
                    child.MouseLeftButtonDown -= new MouseButtonEventHandler(child_MouseLeftButtonDown);
                    child.MouseLeftButtonDown += new MouseButtonEventHandler(child_MouseLeftButtonDown);

                    width = (double)container.GetValue(Canvas.ActualWidthProperty);
                    height = (double)container.GetValue(Canvas.ActualHeightProperty);

                    if (i < this.SelectedIndex)
                    {
                        if (this.orientation == Orientation.Vertical)
                        {
                            stackedPosition += height;
                        }
                        else
                        {
                            stackedPosition += width;
                        }
                    }
                }

                //dynamic item = this.ItemContainerGenerator.ItemFromContainer(container);
                MenuItem item = (MenuItem)this.ItemContainerGenerator.ItemFromContainer(container);
                var isEnabled = item.IsEnabled == null ? true : item.IsEnabled;

                if (isEnabled)
                {
                    if (CustomSelectionChanged != null)
                        CustomSelectionChanged(this, item, item.Children, stackedPosition, width, height);
                }
                else
                {
                    this.SelectedIndex = -1;
                }
            }
        }

        void child_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            var container = (FrameworkElement)VisualTreeHelper.GetParent((FrameworkElement)sender);
            dynamic item = this.ItemContainerGenerator.ItemFromContainer(container);

            var isEnabled = item.IsEnabled == null ? true : item.IsEnabled;

            if (isEnabled)
            {
                MenuItem menuItem = (MenuItem)item;
                if (menuItem.Command != null)
                {
                    if (menuItem.Command.CanExecute(null))
                    {
                        menuItem.Command.Execute(null);
                    }
                }

                if (ItemMouseLeftButtonDown != null)
                    ItemMouseLeftButtonDown(this, item);
            }
        }
    }
}