private void PerformButtonSlide(CornerButton button, SlideDirections direction, Action postAction)
{
var retinaCenter = new Vector2(480, 320);
var buttonCenter = button.Position + new Vector2((float) button.VirtualRegionOnScreen.width / 2.0f, (float) button.VirtualRegionOnScreen.height / 2.0f );
var directingVector = buttonCenter - retinaCenter;
directingVector.Normalize();
var sign = direction == SlideDirections.Out ? 1 : -1;
var targetPosition = buttonCenter + sign * directingVector * ButtonSlideDistance;
Debug.Log(string.Format("{0}: {1}", button.Symbol, targetPosition));
//decentralize position
targetPosition -= new Vector2((float)button.VirtualRegionOnScreen.width / 2.0f, (float)button.VirtualRegionOnScreen.height / 2.0f);
if (direction == SlideDirections.In) {
// need to deal with rounding errors
targetPosition = GetSnapPositionForButton(button);
}
// set different easing functions for sliding in and out
Func<float,float> easingFunc = null;
if (direction == SlideDirections.Out) {
easingFunc = (x) => x * x;
} else {
easingFunc = (x) => (float)(Math.Log(x) + 2.0f) / 2.0f;
}
var controller = new UIElementSlideController(easingFunc) {
StartPosition = button.Position,
TargetPosition = targetPosition,
Duration = TimeSpan.FromMilliseconds(250)
};
if (postAction != null) {
controller.ControllerFinished += (sender, e) => postAction.Invoke();
}
button.RemoveController(button.name);
button.QueueController(button.name, controller);
}