407 lines
14 KiB
Swift
407 lines
14 KiB
Swift
//
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// MediaPreviewViewController.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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import Combine
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import Pageboy
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import MastodonAsset
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import MastodonCore
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import MastodonUI
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import MastodonLocalization
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final class MediaPreviewViewController: UIViewController, NeedsDependency {
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weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
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weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
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var disposeBag = Set<AnyCancellable>()
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var viewModel: MediaPreviewViewModel!
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let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .systemMaterial))
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let pagingViewController = MediaPreviewPagingViewController()
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let topToolbar: UIStackView = {
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let stackView = TouchTransparentStackView()
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stackView.axis = .horizontal
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stackView.distribution = .equalSpacing
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stackView.alignment = .fill
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stackView.translatesAutoresizingMaskIntoConstraints = false
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return stackView
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}()
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let closeButton = HUDButton { button in
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button.setImage(UIImage(systemName: "xmark", withConfiguration: UIImage.SymbolConfiguration(pointSize: 16, weight: .bold))!, for: .normal)
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}
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let altButton = HUDButton { button in
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button.setTitle("ALT", for: .normal)
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}
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}
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extension MediaPreviewViewController {
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override func viewDidLoad() {
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super.viewDidLoad()
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overrideUserInterfaceStyle = .dark
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visualEffectView.frame = view.bounds
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visualEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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view.addSubview(visualEffectView)
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pagingViewController.view.translatesAutoresizingMaskIntoConstraints = false
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addChild(pagingViewController)
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visualEffectView.contentView.addSubview(pagingViewController.view)
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visualEffectView.pinTo(to: pagingViewController.view)
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pagingViewController.didMove(toParent: self)
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view.addSubview(topToolbar)
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NSLayoutConstraint.activate([
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topToolbar.topAnchor.constraint(equalTo: view.layoutMarginsGuide.topAnchor, constant: 12),
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topToolbar.leadingAnchor.constraint(equalTo: view.layoutMarginsGuide.leadingAnchor),
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topToolbar.trailingAnchor.constraint(equalTo: view.layoutMarginsGuide.trailingAnchor),
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])
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topToolbar.addArrangedSubview(closeButton)
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NSLayoutConstraint.activate([
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closeButton.widthAnchor.constraint(equalToConstant: HUDButton.height).priority(.defaultHigh),
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])
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topToolbar.addArrangedSubview(altButton)
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viewModel.mediaPreviewImageViewControllerDelegate = self
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pagingViewController.interPageSpacing = 10
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pagingViewController.delegate = self
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pagingViewController.dataSource = viewModel
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closeButton.button.addTarget(self, action: #selector(MediaPreviewViewController.closeButtonPressed(_:)), for: .touchUpInside)
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altButton.button.addTarget(self, action: #selector(MediaPreviewViewController.altButtonPressed(_:)), for: .touchUpInside)
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// bind view model
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viewModel.$currentPage
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.receive(on: DispatchQueue.main)
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.sink { [weak self] index in
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guard let self = self else { return }
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switch self.viewModel.transitionItem.source {
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case .attachment:
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break
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case .attachments(let mediaGridContainerView):
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UIView.animate(withDuration: 0.3) {
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mediaGridContainerView.setAlpha(1)
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mediaGridContainerView.setAlpha(0, index: index)
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}
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case .profileAvatar, .profileBanner:
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break
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}
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}
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.store(in: &disposeBag)
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viewModel.$currentPage
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.receive(on: DispatchQueue.main)
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.sink { [weak self] index in
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guard let self = self else { return }
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switch self.viewModel.item {
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case .attachment(let previewContext):
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self.topToolbar.isHidden = {
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guard index < previewContext.attachments.count else { return false }
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let attachment = previewContext.attachments[index]
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return attachment.kind == .video || attachment.kind == .audio
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}()
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default:
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break
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}
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}
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.store(in: &disposeBag)
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viewModel.$altText
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.receive(on: DispatchQueue.main)
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.sink { [weak self] altText in
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guard let self else { return }
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UIView.animate(withDuration: 0.3) {
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if altText == nil {
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self.altButton.alpha = 0
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} else {
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self.altButton.alpha = 1
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}
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}
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}
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.store(in: &disposeBag)
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viewModel.$showingChrome
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.receive(on: DispatchQueue.main)
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.removeDuplicates()
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.sink { [weak self] showingChrome in
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UIView.animate(withDuration: 0.3) {
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self?.setNeedsStatusBarAppearanceUpdate()
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self?.topToolbar.alpha = showingChrome ? 1 : 0
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}
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}
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.store(in: &disposeBag)
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// viewModel.$isPoping
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// .receive(on: DispatchQueue.main)
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// .removeDuplicates()
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// .sink { [weak self] _ in
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// guard let self = self else { return }
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// // statusBar style update with animation
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// self.setNeedsStatusBarAppearanceUpdate()
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// UIView.animate(withDuration: 0.3) {
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// }
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// }
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// .store(in: &disposeBag)
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}
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}
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extension MediaPreviewViewController {
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override var prefersStatusBarHidden: Bool {
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!viewModel.showingChrome
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}
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override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
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.all
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}
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}
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extension MediaPreviewViewController {
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@objc private func closeButtonPressed(_ sender: UIButton) {
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dismiss(animated: true, completion: nil)
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}
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@objc private func altButtonPressed(_ sender: UIButton) {
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guard let alt = viewModel.altText else { return }
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present(AltTextViewController(alt: alt, sourceView: sender), animated: true)
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}
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}
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// MARK: - MediaPreviewingViewController
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extension MediaPreviewViewController: MediaPreviewingViewController {
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func isInteractiveDismissible() -> Bool {
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if let mediaPreviewImageViewController = pagingViewController.currentViewController as? MediaPreviewImageViewController {
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let previewImageView = mediaPreviewImageViewController.previewImageView
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// TODO: allow zooming pan dismiss
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guard previewImageView.zoomScale == previewImageView.minimumZoomScale else {
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return false
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}
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let safeAreaInsets = previewImageView.safeAreaInsets
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let statusBarFrameHeight = view.window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0
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let dismissible = previewImageView.contentOffset.y <= -(safeAreaInsets.top - statusBarFrameHeight) + 3 // add 3pt tolerance
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return dismissible
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}
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if let _ = pagingViewController.currentViewController as? MediaPreviewVideoViewController {
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return true
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}
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return false
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}
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}
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// MARK: - PageboyViewControllerDelegate
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extension MediaPreviewViewController: PageboyViewControllerDelegate {
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func pageboyViewController(
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_ pageboyViewController: PageboyViewController,
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willScrollToPageAt index: PageboyViewController.PageIndex,
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direction: PageboyViewController.NavigationDirection,
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animated: Bool
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) {
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// do nothing
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}
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func pageboyViewController(
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_ pageboyViewController: PageboyViewController,
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didScrollTo position: CGPoint,
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direction: PageboyViewController.NavigationDirection,
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animated: Bool
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) {
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// do nothing
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}
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func pageboyViewController(
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_ pageboyViewController: PageboyViewController,
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didScrollToPageAt index: PageboyViewController.PageIndex,
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direction: PageboyViewController.NavigationDirection,
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animated: Bool
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) {
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// update page control
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// pageControl.currentPage = index
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viewModel.currentPage = index
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}
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func pageboyViewController(
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_ pageboyViewController: PageboyViewController,
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didReloadWith currentViewController: UIViewController,
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currentPageIndex: PageboyViewController.PageIndex
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) {
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// do nothing
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}
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}
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// MARK: - MediaPreviewImageViewControllerDelegate
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extension MediaPreviewViewController: MediaPreviewImageViewControllerDelegate {
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func mediaPreviewImageViewController(_ viewController: MediaPreviewImageViewController, tapGestureRecognizerDidTrigger tapGestureRecognizer: UITapGestureRecognizer) {
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let location = tapGestureRecognizer.location(in: viewController.previewImageView.imageView)
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let isContainsTap = viewController.previewImageView.imageView.bounds.contains(location)
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if isContainsTap {
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self.viewModel.showingChrome.toggle()
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} else {
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dismiss(animated: true, completion: nil)
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}
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}
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func mediaPreviewImageViewController(
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_ viewController: MediaPreviewImageViewController,
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contextMenuActionPerform action: MediaPreviewImageViewController.ContextMenuAction
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) {
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switch action {
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case .savePhoto:
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guard let assetURL = viewController.viewModel.item.assetURL else { return }
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context.photoLibraryService.save(imageSource: .url(assetURL))
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.sink { [weak self] completion in
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guard let self = self else { return }
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switch completion {
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case .failure(let error):
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guard let error = error as? PhotoLibraryService.PhotoLibraryError,
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case .noPermission = error else { return }
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let alertController = SettingService.openSettingsAlertController(
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title: L10n.Common.Alerts.SavePhotoFailure.title,
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message: L10n.Common.Alerts.SavePhotoFailure.message
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)
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_ = self.coordinator.present(
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scene: .alertController(alertController: alertController),
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from: self,
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transition: .alertController(animated: true, completion: nil)
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)
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case .finished:
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break
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}
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} receiveValue: { _ in
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// do nothing
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}
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.store(in: &context.disposeBag)
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case .copyPhoto:
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guard let assetURL = viewController.viewModel.item.assetURL else { return }
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context.photoLibraryService.copy(imageSource: .url(assetURL))
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.sink { completion in
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switch completion {
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case .failure(_):
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break
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case .finished:
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break
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}
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} receiveValue: { _ in
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// do nothing
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}
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.store(in: &context.disposeBag)
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case .share:
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let applicationActivities: [UIActivity] = [
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SafariActivity(sceneCoordinator: self.coordinator)
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]
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let activityViewController = UIActivityViewController(
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activityItems: {
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var activityItems: [Any] = []
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if let assetURL = viewController.viewModel.item.assetURL {
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activityItems.append(assetURL)
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}
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return activityItems
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}(),
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applicationActivities: applicationActivities
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)
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activityViewController.popoverPresentationController?.sourceView = viewController.previewImageView.imageView
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self.present(activityViewController, animated: true, completion: nil)
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}
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}
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}
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extension MediaPreviewViewController {
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func closeKeyCommand(input: String) -> UIKeyCommand {
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UIKeyCommand(
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title: L10n.Scene.Preview.Keyboard.closePreview,
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image: nil,
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action: #selector(MediaPreviewViewController.closePreviewKeyCommandHandler(_:)),
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input: input,
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modifierFlags: [],
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propertyList: nil,
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alternates: [],
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discoverabilityTitle: nil,
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attributes: [],
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state: .off
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)
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}
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var showNextKeyCommand: UIKeyCommand {
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UIKeyCommand(
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title: L10n.Scene.Preview.Keyboard.closePreview,
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image: nil,
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action: #selector(MediaPreviewViewController.showNextKeyCommandHandler(_:)),
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input: "j",
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modifierFlags: [],
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propertyList: nil,
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alternates: [],
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discoverabilityTitle: nil,
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attributes: [],
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state: .off
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)
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}
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var showPreviousKeyCommand: UIKeyCommand {
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UIKeyCommand(
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title: L10n.Scene.Preview.Keyboard.closePreview,
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image: nil,
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action: #selector(MediaPreviewViewController.showPreviousKeyCommandHandler(_:)),
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input: "k",
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modifierFlags: [],
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propertyList: nil,
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alternates: [],
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discoverabilityTitle: nil,
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attributes: [],
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state: .off
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)
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}
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override var keyCommands: [UIKeyCommand] {
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return [
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closeKeyCommand(input: UIKeyCommand.inputEscape),
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closeKeyCommand(input: "i"),
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showNextKeyCommand,
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showPreviousKeyCommand,
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]
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}
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@objc private func closePreviewKeyCommandHandler(_ sender: UIKeyCommand) {
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dismiss(animated: true, completion: nil)
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}
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@objc private func showNextKeyCommandHandler(_ sender: UIKeyCommand) {
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pagingViewController.scrollToPage(.next, animated: true, completion: nil)
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}
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@objc private func showPreviousKeyCommandHandler(_ sender: UIKeyCommand) {
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pagingViewController.scrollToPage(.previous, animated: true, completion: nil)
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}
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}
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