protected override IObservable<ImageInfo> WhenLoadedInternal(Uri uri, Size size)
{
return Observable.Create<ImageInfo>(observer =>
{
if (imageData != null)
{
var imageInfo = new ImageInfo(uri, size, imageData) { ForceFallback = true };
observer.OnNext(imageInfo);
}
observer.OnCompleted();
return () => { };
});
}
private async void ProceedReqeustAsync(ImageLoadContext request)
{
try
{
var imageResponse = await WebRequest.Create(request.Uri).GetResponseAsync();
var imageData = await imageResponse.GetResponseStream().ToArrayAsync();
var resizedImageInfo = await imageData.ResizeAsync(request.Size, true);
var result = new ImageInfo
{
Data = resizedImageInfo.Data,
Size = resizedImageInfo.Size,
Uri = request.Uri
};
request.Observer.OnNext(result);
request.Observer.OnCompleted();
}
catch (WebException ex)
{
request.Observer.OnError(new ImageLoaderException(string.Format("An error occurred when loading the image on '{0}'", request.Uri), ex));
}
catch (Exception ex)
{
request.Observer.OnError(new ImageLoaderException(string.Format("An error occurred when parsing loaded image on '{0}'", request.Uri), ex));
}
finally
{
lock (this.pendingRequests)
{
if (this.pendingRequests.Any())
{
var newRequest = this.pendingRequests.First();
this.pendingRequests.RemoveFirst();
this.ProceedReqeustAsync(newRequest);
}
else
{
this.requestsCounter--;
}
}
}
}
protected bool Equals(ImageInfo other)
{
return Size.Equals(other.Size) && Equals(Uri, other.Uri);
}
/// <summary>
/// Notifies that the image is loaded from fallback <see cref="BaseImageLoader"/>.
/// </summary>
/// <param name="image">
/// The loaded image.
/// </param>
/// <remarks>
/// Use this method to save/cache the loaded image.
/// </remarks>
protected virtual void OnFallbackImageLoaded(ImageInfo image)
{
}
