// MARK: - Pan
typealias HandlePanGesture = MSAlertController
extension HandlePanGesture: UIGestureRecognizerDelegate {
    @objc func handlePan(sender: UIPanGestureRecognizer) {
        switch sender.state {
            case .began:
                startLocation = sender.location(in: view)
                if let direction = sender.direction {
                    if animator?.currentState == .closed {
                        if direction == .left {
                            animator?.setAnimation(to: .open)
                        }
                    } else {
                        if direction == .right {
                            animator?.setAnimation(to: .closed)
                        }
                    }
                }
                animator?.trackProgress()
            case .changed:
                currentLocation = sender.location(in: view)
                animator?.setFractionComplete(fraction: sideGap/self.maxdx)
            case .ended:
                animator?.reverseAnimation(sidegap: sideGap)
                animator?.completeAnimation()
                break
            default:
                break
        }
        sender.setTranslation(CGPoint.zero, in: view)
    }
}