/// <summary>
/// Loads the image asynchronous.
/// </summary>
/// <param name="position">The position.</param>
/// <param name="url">The URL.</param>
/// <returns>Task.</returns>
private Task LoadImageAsync(nint position, string url)
{
return(Task.Run(
() =>
{
var img = GestureHelpers.LoadFromUrl(url);
InvokeOnMainThread(
() =>
{
var imgView = _scroller.Subviews[position] as UIImageView;
if (_pageControl.CurrentPage == position && FadeImages)
{
FadeImageViewIn(imgView, img);
}
else
{
imgView.Image = img;
}
});
}));
}
/// <summary>
/// Adds the image.
/// </summary>
/// <param name="rect">The rect.</paramAddImage>
/// <param name="position">The position.</param>
/// <param name="im">The im.</param>
private void AddImage(CGRect rect, nint position, string im)
{
var img = new UIImage();
var isRemote = GestureHelpers.IsValidUrl(im);
if (isRemote)
{
//dont await , fire and forget
LoadImageAsync(position, im);
}
else
{
var fileName = im;
if (NSFileManager.DefaultManager.FileExists(fileName))
{
var url = new NSUrl(fileName, true);
using (var data = NSData.FromUrl(url))
{
img = UIImage.LoadFromData(data);
}
}
//img = UIImage.FromFile(im);
}
UIImageView imgView;
nfloat x;
nfloat y;
nfloat widht;
nfloat height;
try
{
imgView = new UIImageView(img)
{
AutoresizingMask = UIViewAutoresizing.All,
ContentMode = UIViewContentMode.ScaleToFill,
MultipleTouchEnabled = true, //add 16-12-09
UserInteractionEnabled = true //add 16-12-09
};
if (FadeImages)
{
imgView.Alpha = 0;
}
//if first image is local, fade it in
if (position == 0 && !isRemote)
{
FadeImageViewIn(imgView);
}
//imgView.Frame = new CGRect(rect.Width * position, rect.Top, rect.Width, rect.Height);
if (img.Size.Height > img.Size.Width)
{
widht = img.Size.Width * rect.Height / img.Size.Height;
height = rect.Height;
x = (rect.Width - widht) / 2;
y = 0;
}
else
{
widht = rect.Width;
height = img.Size.Height * rect.Width / img.Size.Width;
x = 0;
y = (rect.Height - height) / 2;
}
imgView.Frame = new CGRect(x, y, widht, height);
//add 16-12-09
imgView.AddGestureRecognizer(new UIPinchGestureRecognizer((UIPinchGestureRecognizer obj) =>
{
if (obj.State == UIGestureRecognizerState.Began || obj.State == UIGestureRecognizerState.Changed)
{
obj.View.Transform *= CGAffineTransform.MakeScale(obj.Scale, obj.Scale);
obj.Scale = 1;
}
}));
imgView.AddGestureRecognizer(new UIPanGestureRecognizer((UIPanGestureRecognizer gestureRecognizer) =>
{
AdjustAnchorPointForGestureRecognizer(gestureRecognizer);
var image = gestureRecognizer.View;
if (gestureRecognizer.State == UIGestureRecognizerState.Began || gestureRecognizer.State == UIGestureRecognizerState.Changed)
{
var translation = gestureRecognizer.TranslationInView(this);
image.Center = new CGPoint(image.Center.X + translation.X, image.Center.Y + translation.Y);
// Reset the gesture recognizer's translation to {0, 0} - the next callback will get a delta from the current position.
gestureRecognizer.SetTranslation(CGPoint.Empty, image);
}
}));
_scroller.AddSubview(imgView);
}
catch (Exception)
{
}
}
