protected virtual void UpdateImageLoadingTask()
{
var ffSource = GetImageSourceBinding(ImagePath, ImageStream);
var placeholderSource = GetImageSourceBinding(LoadingPlaceholderImagePath, null);
Cancel();
TaskParameter imageLoader = null;
if (ffSource == null)
{
_internalImage.Source = null;
IsLoading = false;
return;
}
IsLoading = true;
if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.Url)
{
imageLoader = ImageService.Instance.LoadUrl(ffSource.Path, CacheDuration);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.CompiledResource)
{
imageLoader = ImageService.Instance.LoadCompiledResource(ffSource.Path);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.ApplicationBundle)
{
imageLoader = ImageService.Instance.LoadFileFromApplicationBundle(ffSource.Path);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.Filepath)
{
imageLoader = ImageService.Instance.LoadFile(ffSource.Path);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.Stream)
{
imageLoader = ImageService.Instance.LoadStream(ffSource.Stream);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.EmbeddedResource)
{
imageLoader = ImageService.Instance.LoadEmbeddedResource(ffSource.Path);
}
if (imageLoader != null)
{
// LoadingPlaceholder
if (placeholderSource != null)
{
if (placeholderSource != null)
{
imageLoader.LoadingPlaceholder(placeholderSource.Path, placeholderSource.ImageSource);
}
}
// ErrorPlaceholder
if (!string.IsNullOrWhiteSpace(ErrorPlaceholderImagePath))
{
var errorPlaceholderSource = GetImageSourceBinding(ErrorPlaceholderImagePath, null);
if (errorPlaceholderSource != null)
{
imageLoader.ErrorPlaceholder(errorPlaceholderSource.Path, errorPlaceholderSource.ImageSource);
}
}
if (CustomDataResolver != null)
{
imageLoader.WithCustomDataResolver(CustomDataResolver);
imageLoader.WithCustomLoadingPlaceholderDataResolver(CustomLoadingPlaceholderDataResolver);
imageLoader.WithCustomErrorPlaceholderDataResolver(CustomErrorPlaceholderDataResolver);
}
// Downsample
if ((int)DownsampleHeight != 0 || (int)DownsampleWidth != 0)
{
if (DownsampleUseDipUnits)
{
imageLoader.DownSampleInDip((int)DownsampleWidth, (int)DownsampleHeight);
}
else
{
imageLoader.DownSample((int)DownsampleWidth, (int)DownsampleHeight);
}
}
// RetryCount
if (RetryCount > 0)
{
imageLoader.Retry(RetryCount, RetryDelay);
}
if (BitmapOptimizations.HasValue)
{
imageLoader.BitmapOptimizations(BitmapOptimizations.Value);
}
// FadeAnimation
if (FadeAnimationEnabled.HasValue)
{
imageLoader.FadeAnimation(FadeAnimationEnabled.Value, duration: FadeAnimationDuration);
}
// FadeAnimationForCachedImages
if (FadeAnimationEnabled.HasValue && FadeAnimationForCachedImages.HasValue)
{
imageLoader.FadeAnimation(FadeAnimationEnabled.Value, FadeAnimationForCachedImages.Value, FadeAnimationDuration);
}
// TransformPlaceholders
if (TransformPlaceholders.HasValue)
{
imageLoader.TransformPlaceholders(TransformPlaceholders.Value);
}
// Transformations
if (Transformations != null && Transformations.Count > 0)
{
imageLoader.Transform(Transformations);
}
if (InvalidateLayoutAfterLoaded.HasValue)
{
imageLoader.InvalidateLayout(InvalidateLayoutAfterLoaded.Value);
}
imageLoader.WithPriority(LoadingPriority);
if (CacheType.HasValue)
{
imageLoader.WithCache(CacheType.Value);
}
if (LoadingDelay > 0)
{
imageLoader.Delay(LoadingDelay);
}
imageLoader.Finish((work) =>
{
IsLoading = false;
OnFinish?.Invoke(this, new Args.FinishEventArgs(work));
});
imageLoader.Success((imageInformation, loadingResult) =>
{
OnSuccess?.Invoke(this, new Args.SuccessEventArgs(imageInformation, loadingResult));
_lastImageSource = ffSource;
});
if (OnError != null)
{
imageLoader.Error((ex) => OnError?.Invoke(this, new Args.ErrorEventArgs(ex)));
}
if (OnDownloadStarted != null)
{
imageLoader.DownloadStarted((downloadInformation) => OnDownloadStarted(this, new Args.DownloadStartedEventArgs(downloadInformation)));
}
if (OnDownloadProgress != null)
{
imageLoader.DownloadProgress((progress) => OnDownloadProgress(this, new Args.DownloadProgressEventArgs(progress)));
}
if (OnFileWriteFinished != null)
{
imageLoader.FileWriteFinished((info) => OnFileWriteFinished(this, new Args.FileWriteFinishedEventArgs(info)));
}
if (!string.IsNullOrWhiteSpace(CustomCacheKey))
{
imageLoader.CacheKey(CustomCacheKey);
}
SetupOnBeforeImageLoading(imageLoader);
_scheduledWork = imageLoader.Into(_internalImage);
}
}
private void SetImage(CachedImage oldElement = null)
{
Xamarin.Forms.ImageSource source = Element.Source;
var ffSource = ImageSourceBinding.GetImageSourceBinding(source, Element);
var placeholderSource = ImageSourceBinding.GetImageSourceBinding(Element.LoadingPlaceholder, Element);
if (oldElement != null && _lastImageSource != null && ffSource != null && !ffSource.Equals(_lastImageSource) &&
(string.IsNullOrWhiteSpace(placeholderSource?.Path) || placeholderSource?.Stream != null))
{
_lastImageSource = null;
Control.Image = null;
}
Element.SetIsLoading(true);
Cancel();
TaskParameter imageLoader = null;
if (ffSource == null)
{
if (Control != null)
{
Control.Image = null;
}
ImageLoadingFinished(Element);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.Url)
{
imageLoader = ImageService.Instance.LoadUrl(ffSource.Path, Element.CacheDuration);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.CompiledResource)
{
imageLoader = ImageService.Instance.LoadCompiledResource(ffSource.Path);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.ApplicationBundle)
{
imageLoader = ImageService.Instance.LoadFileFromApplicationBundle(ffSource.Path);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.Filepath)
{
imageLoader = ImageService.Instance.LoadFile(ffSource.Path);
}
else if (ffSource.ImageSource == FFImageLoading.Work.ImageSource.Stream)
{
imageLoader = ImageService.Instance.LoadStream(ffSource.Stream);
}
if (imageLoader != null)
{
// CustomKeyFactory
if (Element.CacheKeyFactory != null)
{
var bindingContext = Element.BindingContext;
imageLoader.CacheKey(Element.CacheKeyFactory.GetKey(source, bindingContext));
}
// LoadingPlaceholder
if (Element.LoadingPlaceholder != null)
{
if (placeholderSource != null)
{
imageLoader.LoadingPlaceholder(placeholderSource.Path, placeholderSource.ImageSource);
}
}
// ErrorPlaceholder
if (Element.ErrorPlaceholder != null)
{
var errorPlaceholderSource = ImageSourceBinding.GetImageSourceBinding(Element.ErrorPlaceholder, Element);
if (errorPlaceholderSource != null)
{
imageLoader.ErrorPlaceholder(errorPlaceholderSource.Path, errorPlaceholderSource.ImageSource);
}
}
// Enable vector image source
var vect1 = Element.Source as IVectorImageSource;
var vect2 = Element.LoadingPlaceholder as IVectorImageSource;
var vect3 = Element.ErrorPlaceholder as IVectorImageSource;
if (vect1 != null)
{
imageLoader.WithCustomDataResolver(vect1.GetVectorDataResolver());
}
if (vect2 != null)
{
imageLoader.WithCustomLoadingPlaceholderDataResolver(vect2.GetVectorDataResolver());
}
if (vect3 != null)
{
imageLoader.WithCustomErrorPlaceholderDataResolver(vect3.GetVectorDataResolver());
}
if (Element.CustomDataResolver != null)
{
imageLoader.WithCustomDataResolver(Element.CustomDataResolver);
imageLoader.WithCustomLoadingPlaceholderDataResolver(Element.CustomDataResolver);
imageLoader.WithCustomErrorPlaceholderDataResolver(Element.CustomDataResolver);
}
// Downsample
if (Element.DownsampleToViewSize && (Element.Width > 0 || Element.Height > 0))
{
if (Element.Height > Element.Width)
{
imageLoader.DownSampleInDip(height: (int)Element.Height);
}
else
{
imageLoader.DownSampleInDip(width: (int)Element.Width);
}
}
else if (Element.DownsampleToViewSize && (Element.WidthRequest > 0 || Element.HeightRequest > 0))
{
if (Element.HeightRequest > Element.WidthRequest)
{
imageLoader.DownSampleInDip(height: (int)Element.HeightRequest);
}
else
{
imageLoader.DownSampleInDip(width: (int)Element.WidthRequest);
}
}
else if ((int)Element.DownsampleHeight != 0 || (int)Element.DownsampleWidth != 0)
{
if (Element.DownsampleHeight > Element.DownsampleWidth)
{
if (Element.DownsampleUseDipUnits)
{
imageLoader.DownSampleInDip(height: (int)Element.DownsampleHeight);
}
else
{
imageLoader.DownSample(height: (int)Element.DownsampleHeight);
}
}
else
{
if (Element.DownsampleUseDipUnits)
{
imageLoader.DownSampleInDip(width: (int)Element.DownsampleWidth);
}
else
{
imageLoader.DownSample(width: (int)Element.DownsampleWidth);
}
}
}
// RetryCount
if (Element.RetryCount > 0)
{
imageLoader.Retry(Element.RetryCount, Element.RetryDelay);
}
if (Element.BitmapOptimizations.HasValue)
{
imageLoader.BitmapOptimizations(Element.BitmapOptimizations.Value);
}
// FadeAnimation
if (Element.FadeAnimationEnabled.HasValue)
{
imageLoader.FadeAnimation(Element.FadeAnimationEnabled.Value);
}
// TransformPlaceholders
if (Element.TransformPlaceholders.HasValue)
{
imageLoader.TransformPlaceholders(Element.TransformPlaceholders.Value);
}
// Transformations
if (Element.Transformations != null && Element.Transformations.Count > 0)
{
imageLoader.Transform(Element.Transformations);
}
imageLoader.WithPriority(Element.LoadingPriority);
if (Element.CacheType.HasValue)
{
imageLoader.WithCache(Element.CacheType.Value);
}
if (Element.LoadingDelay.HasValue)
{
imageLoader.Delay(Element.LoadingDelay.Value);
}
var element = Element;
imageLoader.Finish((work) => {
element.OnFinish(new CachedImageEvents.FinishEventArgs(work));
ImageLoadingFinished(element);
});
imageLoader.Success((imageInformation, loadingResult) =>
{
element.OnSuccess(new CachedImageEvents.SuccessEventArgs(imageInformation, loadingResult));
_lastImageSource = ffSource;
});
imageLoader.Error((exception) =>
element.OnError(new CachedImageEvents.ErrorEventArgs(exception)));
imageLoader.DownloadStarted((downloadInformation) =>
element.OnDownloadStarted(new CachedImageEvents.DownloadStartedEventArgs(downloadInformation)));
imageLoader.DownloadProgress((progress) =>
element.OnDownloadProgress(new CachedImageEvents.DownloadProgressEventArgs(progress)));
imageLoader.FileWriteFinished((fileWriteInfo) =>
element.OnFileWriteFinished(new CachedImageEvents.FileWriteFinishedEventArgs(fileWriteInfo)));
_currentTask = imageLoader.Into(Control);
}
}