83 lines
3.0 KiB
Swift
83 lines
3.0 KiB
Swift
//
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// GalleryDismissInteraction.swift
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// GalleryVC
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//
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// Created by Shadowfacts on 3/1/24.
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//
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import UIKit
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@MainActor
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class GalleryDismissInteraction: NSObject {
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private let viewController: GalleryViewController
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private var content: GalleryContentViewController?
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private var origContentFrameInGallery: CGRect?
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private var origControlsVisible: Bool?
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private(set) var isActive = false
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private(set) var dismissVelocity: CGPoint?
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private(set) var dismissTranslation: CGPoint?
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init(viewController: GalleryViewController) {
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self.viewController = viewController
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super.init()
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let panRecognizer = UIPanGestureRecognizer(target: self, action: #selector(panRecognized))
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panRecognizer.delegate = self
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viewController.view.addGestureRecognizer(panRecognizer)
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}
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@objc private func panRecognized(_ recognizer: UIPanGestureRecognizer) {
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switch recognizer.state {
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case .began:
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isActive = true
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origContentFrameInGallery = viewController.view.convert(viewController.currentItemViewController.content.view.bounds, from: viewController.currentItemViewController.content.view)
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content = viewController.currentItemViewController.takeContent()
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content!.view.translatesAutoresizingMaskIntoConstraints = true
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content!.view.frame = origContentFrameInGallery!
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viewController.view.addSubview(content!.view)
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origControlsVisible = viewController.currentItemViewController.controlsVisible
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if origControlsVisible! {
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viewController.currentItemViewController.setControlsVisible(false, animated: true)
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}
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case .changed:
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let translation = recognizer.translation(in: viewController.view)
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content!.view.frame = origContentFrameInGallery!.offsetBy(dx: translation.x, dy: translation.y)
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case .ended:
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let translation = recognizer.translation(in: viewController.view)
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let velocity = recognizer.velocity(in: viewController.view)
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dismissVelocity = velocity
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dismissTranslation = translation
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viewController.dismiss(animated: true)
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// don't unset this until after dismiss is called, so that the dismiss animation controller can read it
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isActive = false
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default:
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break
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}
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}
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}
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extension GalleryDismissInteraction: UIGestureRecognizerDelegate {
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func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
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let itemVC = viewController.currentItemViewController
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if viewController.galleryDataSource.galleryContentTransitionSourceView(forItemAt: itemVC.itemIndex) == nil {
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return false
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} else if itemVC.scrollView.zoomScale > itemVC.scrollView.minimumZoomScale {
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return false
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} else if !itemVC.scrollAndZoomEnabled {
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return false
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} else {
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return true
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}
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}
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}
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