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