public void TrackingStarted(object sender, TrackingEventArgs e)
{
var button = (ButtonView)sender;
UIGraphics.BeginImageContext(button.Bounds.Size);
button.Layer.RenderInContext(UIGraphics.GetCurrentContext());
UIImage image = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
if (trackingImageView == null)
{
trackingImageView = new UIImageView(CGRect.Empty);
Superview.AddSubview(trackingImageView);
trackingImageView.Alpha = 0.5f;
}
trackingImageView.Image = image;
trackingImageView.SizeToFit();
CGRect frame = trackingImageView.Frame;
var newFrame = new CGRect(Superview.ConvertPointFromView(button.Frame.Location, this), frame.Size);
trackingImageView.Frame = newFrame;
if (ButtonSelectedEvent != null)
{
ButtonSelectedEvent(button);
}
}
public void TrackingEnded(object sender, TrackingEventArgs e)
{
var button = (ButtonView)sender;
ButtonFinishedEvent?.Invoke(button, trackingImageView, e.Touch);
trackingImageView = null;
}
public void TrackingContinued(object sender, TrackingEventArgs e)
{
var button = (ButtonView)sender;
UITouch location = e.Touch;
CGPoint point = location.LocationInView(Superview);
CGRect frame = trackingImageView.Frame;
var newPoint = new CGPoint(point.X - button.Frame.Size.Width / 2, point.Y - button.Frame.Size.Height / 2);
var newFrame = new CGRect(newPoint, frame.Size);
trackingImageView.Frame = newFrame;
if (ButtonDraggedEvent != null)
{
ButtonDraggedEvent(button, location);
}
}
