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using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Windows.Storage.Streams;
using Windows.UI.Xaml.Media.Imaging;
#if WINDOWS_UWP
namespace Xamarin.Forms.Platform.UWP
#else
namespace Xamarin.Forms.Platform.WinRT
#endif
{
public sealed class ImageLoaderSourceHandler : IImageSourceHandler
{
public async Task<Windows.UI.Xaml.Media.ImageSource> LoadImageAsync(ImageSource imagesoure, CancellationToken cancellationToken = new CancellationToken())
{
var imageLoader = imagesoure as UriImageSource;
if (imageLoader?.Uri == null)
return null;
Stream streamImage = await imageLoader.GetStreamAsync(cancellationToken);
if (streamImage == null || !streamImage.CanRead)
{
return null;
}
using (IRandomAccessStream stream = streamImage.AsRandomAccessStream())
{
try
{
var image = new BitmapImage();
await image.SetSourceAsync(stream);
return image;
}
catch (Exception ex)
{
Debug.WriteLine(ex);
// Because this literally throws System.Exception
// According to https://msdn.microsoft.com/library/windows/apps/jj191522
// this can happen if the image data is bad or the app is close to its
// memory limit
return null;
}
}
}
}
}
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