LONDON-IOS/Pods/Hero/Sources/Transition/HeroTransition+UIViewControllerTransitioningDelegate.swift

// The MIT License (MIT)
//
// Copyright (c) 2016 Luke Zhao <me@lkzhao.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import UIKit

extension HeroTransition: UIViewControllerTransitioningDelegate {
  var interactiveTransitioning: UIViewControllerInteractiveTransitioning? {
    return forceNotInteractive ? nil : self
  }

  public func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    guard !isTransitioning else { return nil }
    self.state = .notified
    self.isPresenting = true
    self.fromViewController = fromViewController ?? presenting
    self.toViewController = toViewController ?? presented
    return self
  }

  public func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    guard !isTransitioning else { return nil }
    self.state = .notified
    self.isPresenting = false
    self.fromViewController = fromViewController ?? dismissed
    return self
  }

  public func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
    return interactiveTransitioning
  }

  public func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
    return interactiveTransitioning
  }
}

extension HeroTransition: UIViewControllerAnimatedTransitioning {
  public func animateTransition(using context: UIViewControllerContextTransitioning) {
    transitionContext = context
    fromViewController = fromViewController ?? context.viewController(forKey: .from)
    toViewController = toViewController ?? context.viewController(forKey: .to)
    transitionContainer = context.containerView
    start()
  }
  public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    return 0.375 // doesn't matter, real duration will be calculated later
  }

  public func animationEnded(_ transitionCompleted: Bool) {
    self.state = .possible
  }
}

extension HeroTransition: UIViewControllerInteractiveTransitioning {
  public var wantsInteractiveStart: Bool {
    return true
  }
  public func startInteractiveTransition(_ transitionContext: UIViewControllerContextTransitioning) {
    animateTransition(using: transitionContext)
  }
}