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using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace Xamarin.Forms
{
public class StreamImageSource : ImageSource, IStreamImageSource
{
public static readonly BindableProperty StreamProperty = BindableProperty.Create("Stream", typeof(Func<CancellationToken, Task<Stream>>), typeof(StreamImageSource),
default(Func<CancellationToken, Task<Stream>>));
public virtual Func<CancellationToken, Task<Stream>> Stream
{
get { return (Func<CancellationToken, Task<Stream>>)GetValue(StreamProperty); }
set { SetValue(StreamProperty, value); }
}
protected override void OnPropertyChanged(string propertyName)
{
if (propertyName == StreamProperty.PropertyName)
OnSourceChanged();
base.OnPropertyChanged(propertyName);
}
async Task<Stream> IStreamImageSource.GetStreamAsync(CancellationToken userToken)
{
if (Stream == null)
return null;
OnLoadingStarted();
userToken.Register(CancellationTokenSource.Cancel);
Stream stream = null;
try
{
stream = await Stream(CancellationTokenSource.Token);
OnLoadingCompleted(false);
}
catch (OperationCanceledException)
{
OnLoadingCompleted(true);
throw;
}
return stream;
}
}
}
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