private void ClearCurrentCachedSongSubscription()
{
if (this.currentCachedSong != null)
{
this.currentCachedSong.IsDownloading = false;
this.currentCachedSong = null;
if (this.currentDownloadStream != null)
{
this.currentDownloadStream.DownloadProgressChanged -= this.CurrentDownloadStreamOnDownloadProgressChanged;
}
}
}
private void SubscribeToSong(Song song, INetworkRandomAccessStream networkRandomAccessStream)
{
var queuedTask = this.FindCachedSongBindingModel(song);
if (queuedTask != null)
{
queuedTask.IsDownloading = true;
this.currentCachedSong = queuedTask;
this.currentDownloadStream = networkRandomAccessStream;
if (this.currentDownloadStream != null)
{
this.currentDownloadStream.DownloadProgressChanged += this.CurrentDownloadStreamOnDownloadProgressChanged;
}
}
}
private async void OnCacheUpdated(SongCachingChangeEvent e)
{
if (e.EventType == SongCachingChangeEventType.StartDownloading)
{
this.ClearCurrentCachedSongSubscription();
this.SubscribeToSong(e.Song, e.Stream);
}
else if (e.EventType == SongCachingChangeEventType.FinishDownloading)
{
this.ClearCurrentCachedSongSubscription();
if (this.currentCachedSong == null)
{
this.currentCachedSong = this.FindCachedSongBindingModel(e.Song);
}
if (this.currentCachedSong != null)
{
this.BindingModel.QueuedTasks.Remove(this.currentCachedSong);
}
await this.Dispatcher.RunAsync(
() =>
{
this.BindingModel.SongsCacheSize += (long)e.Stream.Size;
});
}
else if (e.EventType == SongCachingChangeEventType.FailedToDownload ||
e.EventType == SongCachingChangeEventType.DownloadCanceled ||
e.EventType == SongCachingChangeEventType.ClearCache)
{
this.ClearCurrentCachedSongSubscription();
}
await this.Dispatcher.RunAsync(() => this.StartDownloadCommand.RaiseCanExecuteChanged());
}
