/// <summary>
/// Loads and gets BitmapDrawable using defined parameters.
/// IMPORTANT: you should call SetNoLongerDisplayed method if drawable is no longer displayed
/// IMPORTANT: It throws image loading exceptions - you should handle them
/// </summary>
/// <returns>The bitmap drawable async.</returns>
/// <param name="parameters">Parameters.</param>
public static Task <SelfDisposingBitmapDrawable> AsBitmapDrawableAsync(this TaskParameter parameters)
{
var target = new BitmapTarget();
var userErrorCallback = parameters.OnError;
var finishCallback = parameters.OnFinish;
var tcs = new TaskCompletionSource <SelfDisposingBitmapDrawable>();
parameters
.Error(ex =>
{
tcs.TrySetException(ex);
userErrorCallback?.Invoke(ex);
})
.Finish(scheduledWork =>
{
finishCallback?.Invoke(scheduledWork);
tcs.TrySetResult(target.BitmapDrawable);
});
if (parameters.Source != ImageSource.Stream && string.IsNullOrWhiteSpace(parameters.Path))
{
target.SetAsEmpty(null);
parameters.TryDispose();
return(null);
}
var task = ImageService.CreateTask(parameters, target);
ImageService.Instance.LoadImage(task);
return(tcs.Task);
}
public static Task <WriteableBitmap> AsWriteableBitmapAsync(this TaskParameter parameters)
{
BitmapTarget target = new BitmapTarget();
Action <Exception> userErrorCallback = parameters.OnError;
Action <IScheduledWork> finishCallback = parameters.OnFinish;
TaskCompletionSource <WriteableBitmap> tcs = new TaskCompletionSource <WriteableBitmap>();
parameters.Error(delegate(Exception ex)
{
tcs.TrySetException(ex);
userErrorCallback?.Invoke(ex);
}).Finish(delegate(IScheduledWork scheduledWork)
{
finishCallback?.Invoke(scheduledWork);
tcs.TrySetResult(target.BitmapSource as WriteableBitmap);
});
if (parameters.Source != ImageSource.Stream && string.IsNullOrWhiteSpace(parameters.Path))
{
target.SetAsEmpty(null);
parameters.TryDispose();
return(null);
}
IImageLoaderTask task = ImageService.CreateTask(parameters, target);
ImageService.Instance.LoadImage(task);
return(tcs.Task);
}