private void CancelAll()
{
Cts.Cancel();
Cts.Dispose();
Cts = new CancellationTokenSource();
ActiveDownloads.Clear();
}
private async Task <Uri> HandleDownload(DownloadOperation download, bool alreadyStarted)
{
var bindableDownload = new BindableDownloadOperation(download);
try {
ActiveDownloads.Add(bindableDownload);
var callback = new Progress <DownloadOperation>(OnDownloadStatusUpdate);
IAsyncOperationWithProgress <DownloadOperation, DownloadOperation> op = null;
if (alreadyStarted)
{
var d = download.AttachAsync();
op = download.AttachAsync();
}
else
{
op = download.StartAsync();
}
op.Progress = (a, p) => {
OnBindableStatusUpdate(bindableDownload);
};
// awaits completion of download
DownloadOperation completedDownload = await op.AsTask(Cts.Token, callback);
return(FileUtils.UriFor(completedDownload.ResultFile));
} finally {
// download complete
ActiveDownloads.Remove(bindableDownload);
}
}
/// <summary>
/// Use as callback of every downloads progress
/// </summary>
/// <param name="download">
/// The download that has just progressed
/// </param>
private void DownloadProgress(DownloadOperation download)
{
// Thread safety comes first!
dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
() =>
{
// Get the associated song BackgroundDownload
var songDownload =
ActiveDownloads.FirstOrDefault(
p => ((DownloadOperation)p.Download.DownloadOperation).Guid == download.Guid);
if (songDownload == null)
{
return;
}
songDownload.Download.Status = download.Progress.Status.ToString();
if (download.Progress.TotalBytesToReceive > 0)
{
songDownload.Download.BytesToReceive = download.Progress.TotalBytesToReceive;
songDownload.Download.BytesReceived = download.Progress.BytesReceived;
}
else
{
songDownload.Download.Status = "Waiting";
}
});
}
/// <summary>
/// Hanbdles a single BackgroundDownload for a song.
/// </summary>
/// <param name="song">
/// The song to be downloaded
/// </param>
/// <param name="download">
/// The download operation
/// </param>
/// <param name="start">
/// Either the download is started or just handled
/// </param>
private async void HandleDownload(Song song, DownloadOperation download, bool start)
{
if (song == null || download == null)
{
return;
}
song.Download = new BackgroundDownload(download);
ActiveDownloads.Add(song);
try
{
var progressCallback = new Progress <DownloadOperation>(DownloadProgress);
if (start)
{
// Start the BackgroundDownload and attach a progress handler.
await download.StartAsync().AsTask(song.Download.CancellationTokenSrc.Token, progressCallback);
}
else
{
// The BackgroundDownload was already running when the application started, re-attach the progress handler.
await download.AttachAsync().AsTask(song.Download.CancellationTokenSrc.Token, progressCallback);
}
// Download Completed
var response = download.GetResponseInformation();
// Make sure it is success
if (response.StatusCode < 400)
{
await DownloadFinishedForAsync(song);
}
else
{
song.SongState = SongState.None;
sqlService.UpdateItem(song);
download.ResultFile.DeleteAsync();
}
}
catch
{
song.SongState = SongState.None;
sqlService.UpdateItem(song);
download.ResultFile.DeleteAsync();
}
finally
{
ActiveDownloads.Remove(song);
}
}
public void Update()
{
foreach (var d in ActiveDownloads)
{
d.AttemptResolve();
if (d.Resolved)
{
DownloadsToClear.Add(d);
}
}
foreach (var d in DownloadsToClear)
{
ActiveDownloads.Remove(d);
ImageDownloads.Remove(d.URL);
}
}
public Texture2D GetTexture(string url)
{
if (string.IsNullOrEmpty(url))
{
return(null);
}
if (Images.ContainsKey(url))
{
return(Images[url]);
}
if (ImageDownloads.ContainsKey(url))
{
// waiting for download
return(null);
}
var download = new ImageDownload(this, url);
ImageDownloads.Add(url, download);
ActiveDownloads.Add(download);
return(null);
}
