Attached Navigation Behaviours for WP7

DependencyObjectExtension.cs

using System;
using System.Windows;
using System.Windows.Input;
using Microsoft.Phone.Controls;

namespace Rejseplanen.Assets
{
    public class DependencyObjectExtension
    {
        public static readonly DependencyProperty NavigateToProperty =
            DependencyProperty.RegisterAttached("NavigateTo",
                typeof(Uri), typeof(DependencyObjectExtension),
                new PropertyMetadata(null, OnNavigateToChanged));

        public static Uri GetNavigateTo(DependencyObject d)
        {
            Uri uriSource = null;

            if (Uri.TryCreate(d.GetValue(NavigateToProperty).ToString(), UriKind.Relative, out uriSource))
            {
                return uriSource;
            }

            return null;
        }

        public static void SetNavigateTo(DependencyObject d, Uri value)
        {
            d.SetValue(NavigateToProperty, value);
        }

        private static void OnNavigateToChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var listener = GestureService.GetGestureListener(d);

            var oldCommand = e.OldValue as Uri;
            if (oldCommand != null)
            {
                listener.Tap -= OnNavigateTo;
            }

            var newCommand = e.NewValue as Uri;
            if (newCommand != null)
            {
                listener.Tap += OnNavigateTo;
            }
        }

        private static void OnNavigateTo(object sender, Microsoft.Phone.Controls.GestureEventArgs e)
        {
            var d = sender as DependencyObject;
            var source = GetNavigateTo(d);

            if (source != null)
            {
                (App.Current.RootVisual as PhoneApplicationFrame).Navigate(source);
            }
        }
    }
}