mastodon-ios/Mastodon/Scene/Transition/MediaPreview/MediaPreviewTransitionContr...

122 lines
4.5 KiB
Swift

//
// MediaPreviewTransitionController.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-4-28.
//
import UIKit
final class MediaPreviewTransitionController: NSObject {
weak var mediaPreviewViewController: MediaPreviewViewController?
var wantsInteractiveStart = false
private var panGestureRecognizer: UIPanGestureRecognizer = {
let gestureRecognizer = UIPanGestureRecognizer()
gestureRecognizer.maximumNumberOfTouches = 1
return gestureRecognizer
}()
private var dismissInteractiveTransitioning: MediaHostToMediaPreviewViewControllerAnimatedTransitioning?
override init() {
super.init()
panGestureRecognizer.delegate = self
panGestureRecognizer.addTarget(self, action: #selector(MediaPreviewTransitionController.panGestureRecognizerHandler(_:)))
}
}
extension MediaPreviewTransitionController {
@objc private func panGestureRecognizerHandler(_ sender: UIPanGestureRecognizer) {
guard dismissInteractiveTransitioning == nil else { return }
guard let mediaPreviewViewController = self.mediaPreviewViewController else { return }
wantsInteractiveStart = true
mediaPreviewViewController.dismiss(animated: true, completion: nil)
}
}
// MARK: - UIGestureRecognizerDelegate
extension MediaPreviewTransitionController: UIGestureRecognizerDelegate {
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
if gestureRecognizer === panGestureRecognizer || otherGestureRecognizer === panGestureRecognizer {
// FIXME: should enable zoom up pan dismiss
return false
}
return true
}
func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
if gestureRecognizer === panGestureRecognizer {
guard let mediaPreviewViewController = self.mediaPreviewViewController else { return false }
return mediaPreviewViewController.isInteractiveDismissible()
}
return false
}
}
// MARK: - UIViewControllerTransitioningDelegate
extension MediaPreviewTransitionController: UIViewControllerTransitioningDelegate {
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
guard let mediaPreviewViewController = presented as? MediaPreviewViewController else {
assertionFailure()
return nil
}
self.mediaPreviewViewController = mediaPreviewViewController
self.mediaPreviewViewController?.view.addGestureRecognizer(panGestureRecognizer)
return MediaHostToMediaPreviewViewControllerAnimatedTransitioning(
operation: .push,
transitionItem: mediaPreviewViewController.viewModel.transitionItem,
panGestureRecognizer: panGestureRecognizer
)
}
func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
// not support interactive present
return nil
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
guard let mediaPreviewViewController = dismissed as? MediaPreviewViewController else {
assertionFailure()
return nil
}
return MediaHostToMediaPreviewViewControllerAnimatedTransitioning(
operation: .pop,
transitionItem: mediaPreviewViewController.viewModel.transitionItem,
panGestureRecognizer: panGestureRecognizer
)
}
func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
guard let transitioning = animator as? MediaHostToMediaPreviewViewControllerAnimatedTransitioning,
transitioning.operation == .pop, wantsInteractiveStart else {
return nil
}
dismissInteractiveTransitioning = transitioning
transitioning.delegate = self
return transitioning
}
}
// MARK: - ViewControllerAnimatedTransitioningDelegate
extension MediaPreviewTransitionController: ViewControllerAnimatedTransitioningDelegate {
func animationEnded(_ transitionCompleted: Bool) {
dismissInteractiveTransitioning = nil
wantsInteractiveStart = false
}
}