コード例 #1
0
        /// <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);
        }
コード例 #2
0
        /// <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);
        }