static public FormsCAKeyFrameAnimation CreateAnimationFromCGImageSource(CGImageSource imageSource)
{
FormsCAKeyFrameAnimation animation = null;
float repeatCount = float.MaxValue;
var imageCount = imageSource.ImageCount;
if (imageCount <= 0)
{
return(null);
}
using (var imageData = new ImageDataHelper(imageCount))
{
if (imageSource.TypeIdentifier == "com.compuserve.gif")
{
var imageProperties = imageSource.GetProperties(null);
using (var gifImageProperties = imageProperties?.Dictionary[ImageIO.CGImageProperties.GIFDictionary])
using (var repeatCountValue = gifImageProperties?.ValueForKey(ImageIO.CGImageProperties.GIFLoopCount))
{
if (repeatCountValue != null)
{
float.TryParse(repeatCountValue.ToString(), out repeatCount);
}
else
{
repeatCount = 1;
}
if (repeatCount == 0)
{
repeatCount = float.MaxValue;
}
}
}
for (int i = 0; i < imageCount; i++)
{
imageData.AddFrameData(i, imageSource);
}
animation = imageData.CreateKeyFrameAnimation();
if (animation != null)
{
animation.RemovedOnCompletion = false;
animation.KeyPath = "contents";
animation.RepeatCount = repeatCount;
animation.Width = imageData.Width;
animation.Height = imageData.Height;
if (imageCount == 1)
{
animation.Duration = double.MaxValue;
animation.KeyTimes = null;
}
}
}
return(animation);
}
public async Task <FormsCAKeyFrameAnimation> LoadImageAnimationAsync(ImageSource imagesource, CancellationToken cancelationToken = default(CancellationToken), float scale = 1)
{
FormsCAKeyFrameAnimation animation = await ImageAnimationHelper.CreateAnimationFromUriImageSourceAsync(imagesource as UriImageSource, cancelationToken).ConfigureAwait(false);
if (animation == null)
{
Log.Warning(nameof(FileImageSourceHandler), "Could not find image: {0}", imagesource);
}
return(animation);
}
public Task <FormsCAKeyFrameAnimation> LoadImageAnimationAsync(ImageSource imagesource, CancellationToken cancelationToken = default(CancellationToken), float scale = 1)
{
FormsCAKeyFrameAnimation animation = ImageAnimationHelper.CreateAnimationFromFileImageSource(imagesource as FileImageSource);
if (animation == null)
{
Log.Warning(nameof(FileImageSourceHandler), "Could not find image: {0}", imagesource);
}
return(Task.FromResult(animation));
}
static public FormsCAKeyFrameAnimation CreateAnimationFromFileImageSource(FileImageSource imageSource)
{
FormsCAKeyFrameAnimation animation = null;
string file = imageSource?.File;
if (!string.IsNullOrEmpty(file))
{
using (var parsedImageSource = CGImageSource.FromUrl(NSUrl.CreateFileUrl(file, null)))
{
animation = ImageAnimationHelper.CreateAnimationFromCGImageSource(parsedImageSource);
}
}
return(animation);
}
protected override void Dispose(bool disposing)
{
if (_isDisposed)
{
return;
}
_isDisposed = true;
if (disposing && _animation != null)
{
_animation.AnimationStopped -= OnAnimationStopped;
Layer.RemoveAnimation(AnimationLayerName);
_animation.Dispose();
_animation = null;
}
base.Dispose(disposing);
}
static public async Task <FormsCAKeyFrameAnimation> CreateAnimationFromUriImageSourceAsync(UriImageSource imageSource, CancellationToken cancelationToken = default(CancellationToken))
{
FormsCAKeyFrameAnimation animation = null;
if (imageSource?.Uri != null)
{
using (var streamImage = await imageSource.GetStreamAsync(cancelationToken).ConfigureAwait(false))
{
if (streamImage != null)
{
using (var parsedImageSource = CGImageSource.FromData(NSData.FromStream(streamImage)))
{
animation = ImageAnimationHelper.CreateAnimationFromCGImageSource(parsedImageSource);
}
}
}
}
return(animation);
}