using System.Collections.Generic;

using System.Windows;

using System.Windows.Controls;

using Microsoft.Phone.Controls;

namespace ExtendedControls

{

    public class ExtendedSelector : LongListSelector

    {

        public static readonly DependencyProperty SelectedItemProperty =

            DependencyProperty.Register("SelectedItem", typeof (object), typeof (ExtendedSelector), new PropertyMetadata(default(object)));

        public static readonly DependencyProperty SelectionModeProperty =

            DependencyProperty.Register("SelectionMode", typeof (SelectionMode), typeof (ExtendedSelector), new PropertyMetadata(default(SelectionMode)));

        public SelectionMode SelectionMode

        {

            get { return (SelectionMode) GetValue(SelectionModeProperty); }

            set { SetValue(SelectionModeProperty, value); }

        }

        public new object SelectedItem

        {

            get { return GetValue(SelectedItemProperty); }

            set { SetValue(SelectedItemProperty, value); }

        }

        public ExtendedSelector()

        {

            SelectionMode = SelectionMode.Single;

            SelectionChanged += (sender, args) =>

            {

                if(SelectionMode == SelectionMode.Single)

                    SelectedItem = args.AddedItems[0];

                else if (SelectionMode == SelectionMode.Multiple)

                {

                    if (SelectedItem == null)

                    {

                        SelectedItem = new List<object>();

                    }

                    foreach (var item in args.AddedItems)

                    {

                        ((List<object>)SelectedItem).Add(item);

                    }

                    foreach (var removedItem in args.RemovedItems)

                    {

                        if (((List<object>) SelectedItem).Contains(removedItem))

                        {

                            ((List<object>) SelectedItem).Remove(removedItem);

                        }

                    }

                }

            };

        }

    }

}