/// <summary>
/// Asynchronously returns a list of all albums in the picture library
/// </summary>
/// <returns>A list of all albums in the picture library</returns>
public Task<List<PixPresenterPortableLib.AlbumViewModel>> GetAlbumsAsync()
{
return Task.Run(delegate
{
List<AlbumViewModel> result = new List<AlbumViewModel>();
MediaLibrary mediaLib = new MediaLibrary();
foreach (var album in mediaLib.RootPictureAlbum.Albums)
{
byte[] thumb = null;
// Exclude empty picture albums
if (album.Pictures.Count > 0)
{
Stream stream = album.Pictures[0].GetThumbnail();
using (BinaryReader br = new BinaryReader(stream))
{
thumb = br.ReadBytes((int)stream.Length);
}
AlbumViewModel avm = new AlbumViewModel(App.AlbumService, album.Name, album.Name, thumb);
avm.Name = album.Name;
result.Add(avm);
}
}
return result;
});
}
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
// internal navigation or fast resume
if (_album != null)
return;
if (this.NavigationContext.QueryString.ContainsKey("albumname"))
{
string albumName = NavigationContext.QueryString["albumname"];
foreach (var album in App.AlbumsViewModel.Albums)
{
if (album.Name == albumName)
{
_album = album;
break;
}
}
}
else
{
return;
}
await _album.LoadPicturesAsync();
this.DataContext = _album;
object token;
if (State.TryGetValue("current_token", out token))
_album.RestoreCurrentPictureToken(token);
}
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
if (e.Parameter != null)
{
if (e.Parameter.GetType() == typeof(string))
{
this.AlbumName = e.Parameter.ToString();
_album = App.AlbumsViewModel.Albums.First((a) => a.Name == this.AlbumName);
// Load the pictures from the album
await _album.LoadPicturesAsync();
if (_album.Pictures.Count == 0)
return;
this.DataContext = _album;
// Prepare data for carousel view. This creates a copy of the
// pictures in an album, adds the first picture to the end of the list,
// and the last picture to the beginning of the list. The selected index
// is adjusted in the FlipView.SelectionChanged event to simulate a
// "carousel" view of the pictures.
var firstPicture = _album.Pictures[0];
var lastPicture = _album.Pictures.Last();
_pictureCarousel.Add(lastPicture);
foreach (var p in _album.Pictures) { _pictureCarousel.Add(p); }
_pictureCarousel.Add(firstPicture);
picturesViewSource.Source = _pictureCarousel;
}
}
base.OnNavigatedTo(e);
}
