/// <summary>
/// Loads and gets UImage using defined parameters.
/// IMPORTANT: It throws image loading exceptions - you should handle them
/// </summary>
/// <returns>The PImage async.</returns>
/// <param name="parameters">Parameters.</param>
public static Task <NSImage> AsNSImageAsync(this TaskParameter parameters)
{
var target = new PImageTarget();
var userErrorCallback = parameters.OnError;
var finishCallback = parameters.OnFinish;
var tcs = new TaskCompletionSource <NSImage>();
parameters
.Error(ex =>
{
tcs.TrySetException(ex);
userErrorCallback?.Invoke(ex);
})
.Finish(scheduledWork =>
{
finishCallback?.Invoke(scheduledWork);
tcs.TrySetResult(target.PImage);
});
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);
}
/// <summary>
/// Loads and gets PImage using defined parameters.
/// IMPORTANT: It throws image loading exceptions - you should handle them
/// </summary>
/// <returns>The PImage async.</returns>
/// <param name="parameters">Parameters.</param>
/// <param name="imageScale">Image scale.</param>
public static Task <PImage> AsPImageAsync(this TaskParameter parameters, float imageScale = -1f)
{
var target = new PImageTarget();
var userErrorCallback = parameters.OnError;
var finishCallback = parameters.OnFinish;
var tcs = new TaskCompletionSource <PImage>();
List <Exception> exceptions = null;
parameters
.Error(ex =>
{
if (exceptions == null)
{
exceptions = new List <Exception>();
}
exceptions.Add(ex);
userErrorCallback?.Invoke(ex);
})
.Finish(scheduledWork =>
{
finishCallback?.Invoke(scheduledWork);
if (exceptions != null)
{
tcs.TrySetException(exceptions);
}
else
{
tcs.TrySetResult(target.PImage);
}
});
if (parameters.Source != ImageSource.Stream && string.IsNullOrWhiteSpace(parameters.Path))
{
target.SetAsEmpty(null);
parameters.TryDispose();
return(null);
}
var task = CreateTask(parameters, imageScale, target);
ImageService.Instance.LoadImage(task);
return(tcs.Task);
}
