partial void OnSourceChangedPartial(ImageSource newValue, ImageSource oldValue)
{
if (newValue == null || !newValue.HasSource())
{
SetImage(null, failIfNull: false);
oldValue?.Dispose();
_imageScheduler.Disposable = null;
}
else if (newValue.ImageData != null)
{
SetImage(newValue.ImageData);
oldValue?.Dispose();
_imageScheduler.Disposable = null;
}
else
{
SetImage(null, failIfNull: false);
oldValue?.Dispose();
_imageScheduler.Disposable = CoreDispatcher.Main.RunAsync(
CoreDispatcherPriority.Normal,
async ct =>
{
var image = await Task.Run(async() => await newValue.Open(ct));
if (ct.IsCancellationRequested)
{
return;
}
SetImage(image);
});
}
}
private async void OpenImageAsync(ImageSource newValue)
{
CoreDispatcher.CheckThreadAccess();
using var cd = new CancellationDisposable();
_imageScheduler.Disposable = cd;
var image = await Task.Run(() => newValue.Open(cd.Token), cd.Token);
if (cd.Token.IsCancellationRequested)
{
return;
}
SetImage(image);
}