[Débutant] Mon premier slide show sous Win8

Bonjour,

Je débute dans le dev sur mobile pour Winsows 8. J'ai suivi ce tuto (plutôt bien fait).
Je l'ai fait en C#/XAML. Je suis toutes les instructions jusqu'au point 7. Quand je lance l'application, j'ai bien une image affichée, mais je ne trouve pas comment passer l'image suivante, "slider"...
Est-ce que qq a déjà fait ce tuto ou aurait une idée?

Voici le code C#

Code:

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Windows.UI.Xaml.Media.Imaging;
using Windows.Media.PlayTo;
using Windows.UI;
using Windows.Storage;
using Windows.Storage.Streams;
 
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
 
namespace SlideShow
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
 
        private PlayToManager ptm = null;
        private DispatcherTimer timer = null;
        private IReadOnlyList<StorageFile> imageList = null; // Liste des images a afficher
        private int imageIdx = -1; // index de l'image courante
        private Image currentPlayer = null; // afficheur d'image courant
        private bool isStreaming; // True if Streaming
        private CoreDispatcher messageDispatcher = Window.Current.CoreWindow.Dispatcher;
 
        public MainPage()
        {
            this.InitializeComponent();
        }
 
        /// <summary>
        /// Invoked when this page is about to be displayed in a Frame.
        /// </summary>
        /// <param name="e">Event data that describes how this page was reached.  The Parameter
        /// property is typically used to configure the page.</param>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            this.ptm = PlayToManager.GetForCurrentView();
            this.ptm.SourceRequested += this.SourceRequested;
            this.ptm.SourceSelected += this.SourceSelected;
 
            this.timer = new DispatcherTimer();
            this.timer.Interval = new TimeSpan(0, 0, 5);
            this.timer.Tick += TimeoutElapsed;
 
            this.StartSlideShow();
        }
 
        /// <summary>
        /// Récupère la liste des images et démarre le slideShow
        /// </summary>
        async private void StartSlideShow()
        {
            var resultsLibrary = await Windows.Storage.KnownFolders.PicturesLibrary.GetFilesAsync();
            this.imageList = resultsLibrary;
 
            if (imageList.Count > 0)
            {
                SetImageSource(this.ImagePlayer1, this.GetNextImage());
            }
            else
            {
                MessageBlock.Text = "No image found in the Pictures Library";
            }
 
        }
 
        /// <summary>
        /// Affiche une image dans une vue
        /// </summary>
        /// <param name="image">vue ou l'image est affichée</param>
        /// <param name="imageFile">file image à afficher</param>
        async private void SetImageSource(Image imagePlayer, StorageFile imageFile)
        {
            // ouvert de l'image dans un object bitmap
            IRandomAccessStream imageStream = await imageFile.OpenAsync(FileAccessMode.Read);
 
            BitmapImage imageBitmap = new BitmapImage();
            imageBitmap.SetSource(imageStream);
 
            // Set l'image au player
            imagePlayer.Source = imageBitmap;
        }
 
        /// <summary>
        /// Récupère l'image suivante
        /// </summary>
        /// <returns></returns>
        private StorageFile GetNextImage()
        {
            this.imageIdx++;
            if (this.imageIdx >= this.imageList.Count)
            {
                this.imageIdx = 0;
            }
 
            return imageList[this.imageIdx];
        }
 
        private void ShowImage(Image imagePlayer)
        {
            this.currentPlayer = imagePlayer;
            Image otherImagePlayer = (imagePlayer.Name == "ImagePlayer1") ? this.ImagePlayer2 : this.ImagePlayer1;
 
            // Met en cache la prochaine image
            SetImageSource(otherImagePlayer, GetNextImage());
 
            if (this.isStreaming)
            {
                try
                {
                    otherImagePlayer.PlayToSource.PlayNext();
                }
                catch (Exception )
                {
                }
            }
            else
            {
                otherImagePlayer.Visibility = Visibility.Collapsed;
                imagePlayer.Visibility = Visibility.Visible;
            }
 
            this.currentPlayer = otherImagePlayer;
            this.timer.Start();
 
        }
 
        /// <summary>
        /// Pass image source to play to
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        async private void SourceRequested(PlayToManager sender, PlayToSourceRequestedEventArgs e)
        {
            e.SourceRequest.SetSource(currentPlayer.PlayToSource);
 
            // Set Play To Source next properties
            ImagePlayer1.PlayToSource.Next = ImagePlayer2.PlayToSource;
            ImagePlayer2.PlayToSource.Next = ImagePlayer1.PlayToSource;
 
            await messageDispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                // Stop slide show
                timer.Stop();
            });
        }
 
 
        /// <summary>
        /// Set up Streamin if device selected
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        async private void SourceSelected(PlayToManager sender, PlayToSourceSelectedEventArgs e)
        {
            WriteMessageText("Streaming...");
            this.isStreaming = true;
            await this.messageDispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
                {
                    //hide local image players
                    this.ImagePlayer1.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
                    this.ImagePlayer2.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
 
                    // start slide show again with the next image
                    timer.Start();
                });
        }
 
        async private void WriteMessageText(String message, bool isOverwrite = false)
        {
            await messageDispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
                {
                    if (isOverwrite)
                    {
                        this.MessageBlock.Text = message;
                    }
                    else
                    {
                        this.MessageBlock.Text += message;
                    }
                });
        }
 
        private void TimeoutElapsed(Object sender, Object e)
        {
            this.ShowImage(currentPlayer);
        }
    }
}

et le XAML

Code:

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<Page
    x:Class="SlideShow.MainPage"
    IsTabStop="false"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:SlideShow"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
 
    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <StackPanel>
            <TextBlock x:Name="MessageBlock" Width="300"/>
        </StackPanel>
        <StackPanel>
            <Image x:Name="ImagePlayer1" Height="400" Width="600"/>
            <Image x:Name="ImagePlayer2" Height="400" Width="600"/>
        </StackPanel>
    </Grid>
</Page>