void StartLoadingAnimated(bool animated)
{
LoadIndicator.StartAnimating();
UIView.Animate((animated) ? 0.2 : 0.0,
() =>
{
ImageView.Alpha = 0f;
LoadIndicator.Alpha = 1f;
});
}
public void SetOriginalImage(UIImage originalImage, CGRect cropFrame)
{
LoadIndicator.StartAnimating();
InvokeOnMainThread(() =>
{
CGImage imageRef = originalImage.CGImage;
UIImageOrientation imageOrientation = originalImage.Orientation;
if (imageRef == null)
{
return;
}
var bytesPerRow = 0;
var width = imageRef.Width;
var height = imageRef.Height;
var bitsPerComponent = imageRef.BitsPerComponent;
CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
CGBitmapFlags bitmapInfo = imageRef.BitmapInfo;
switch (imageOrientation)
{
case UIImageOrientation.RightMirrored:
case UIImageOrientation.LeftMirrored:
case UIImageOrientation.Right:
case UIImageOrientation.Left:
width = imageRef.Height;
height = imageRef.Width;
break;
default:
break;
}
CGSize imageSize = new CGSize(width, height);
CGBitmapContext context = new CGBitmapContext(null,
width,
height,
bitsPerComponent,
bytesPerRow,
colorSpace,
bitmapInfo);
colorSpace.Dispose();
if (context == null)
{
imageRef.Dispose();
return;
}
switch (imageOrientation)
{
case UIImageOrientation.RightMirrored:
case UIImageOrientation.Right:
context.TranslateCTM(imageSize.Width / 2, imageSize.Height / 2);
context.RotateCTM(-((nfloat)Math.PI / 2));
context.TranslateCTM(-imageSize.Height / 2, -imageSize.Width / 2);
break;
case UIImageOrientation.LeftMirrored:
case UIImageOrientation.Left:
context.TranslateCTM(imageSize.Width / 2, imageSize.Height / 2);
context.RotateCTM((nfloat)(Math.PI / 2));
context.TranslateCTM(-imageSize.Height / 2, -imageSize.Width / 2);
break;
case UIImageOrientation.Down:
case UIImageOrientation.DownMirrored:
context.TranslateCTM(imageSize.Width / 2, imageSize.Height / 2);
context.RotateCTM((nfloat)Math.PI);
context.TranslateCTM(-imageSize.Width / 2, -imageSize.Height / 2);
break;
default:
break;
}
context.InterpolationQuality = CGInterpolationQuality.High;
context.SetBlendMode(CGBlendMode.Copy);
context.DrawImage(new CGRect(0, 0, imageRef.Width, imageRef.Height), imageRef);
CGImage contextImage = context.ToImage();
context.Dispose();
if (contextImage != null)
{
_originalImage = UIImage.FromImage(contextImage, originalImage.CurrentScale, UIImageOrientation.Up);
contextImage.Dispose();
}
imageRef.Dispose();
BeginInvokeOnMainThread(() =>
{
CGSize convertedImageSize = new CGSize(_originalImage.Size.Width / _cropSizeRatio,
_originalImage.Size.Height / _cropSizeRatio);
ImageView.Alpha = 0;
ImageView.Image = _originalImage;
CGSize sampleImageSize = new CGSize(Math.Max(convertedImageSize.Width, ScrollView.Frame.Size.Width),
Math.Max(convertedImageSize.Height, ScrollView.Frame.Size.Height));
ScrollView.MinimumZoomScale = 1;
ScrollView.MaximumZoomScale = 1;
ScrollView.ZoomScale = 1;
ImageView.Frame = new CGRect(0, 0, convertedImageSize.Width, convertedImageSize.Height);
nfloat zoomScale = 1;
if (convertedImageSize.Width < convertedImageSize.Height)
{
zoomScale = (ScrollView.Frame.Size.Width / convertedImageSize.Width);
}
else
{
zoomScale = (ScrollView.Frame.Size.Height / convertedImageSize.Height);
}
ScrollView.ContentSize = sampleImageSize;
if (zoomScale < 1)
{
ScrollView.MinimumZoomScale = zoomScale;
ScrollView.MaximumZoomScale = 1;
ScrollView.ZoomScale = zoomScale;
}
else
{
ScrollView.MinimumZoomScale = zoomScale;
ScrollView.MaximumZoomScale = zoomScale;
ScrollView.ZoomScale = zoomScale;
}
ScrollView.ContentInset = UIEdgeInsets.Zero;
ScrollView.ContentOffset = new CGPoint((ImageView.Frame.Size.Width - ScrollView.Frame.Size.Width) / 2, (ImageView.Frame.Size.Height - ScrollView.Frame.Size.Height) / 2);
if (cropFrame.Size.Width > 0 && cropFrame.Size.Height > 0)
{
nfloat scale = UIScreen.MainScreen.Scale;
nfloat newZoomScale = (_targetSize.Width * scale) / cropFrame.Size.Width;
ScrollView.ZoomScale = newZoomScale;
nfloat heightAdjustment = (_targetSize.Height / _cropSizeRatio) - ScrollView.ContentSize.Height;
nfloat offsetY = cropFrame.Y + (heightAdjustment * _cropSizeRatio * scale);
ScrollView.ContentOffset = new CGPoint(cropFrame.X / scale / _cropSizeRatio,
(offsetY / scale / _cropSizeRatio) - heightAdjustment);
}
ScrollView.SetNeedsLayout();
UIView.Animate(0.3,
() =>
{
LoadIndicator.Alpha = 0;
ImageView.Alpha = 1;
}, () =>
{
LoadIndicator.StopAnimating();
});
});
});
}