mastodon-ios/Mastodon/Scene/MediaPreview/MediaPreviewViewController....

373 lines
15 KiB
Swift

//
// MediaPreviewViewController.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-4-28.
//
import os.log
import UIKit
import Combine
import Pageboy
import MastodonAsset
import MastodonLocalization
final class MediaPreviewViewController: UIViewController, NeedsDependency {
static let closeButtonSize = CGSize(width: 30, height: 30)
weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
var disposeBag = Set<AnyCancellable>()
var viewModel: MediaPreviewViewModel!
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .systemMaterial))
let pagingViewController = MediaPreviewPagingViewController()
let closeButtonBackground: UIVisualEffectView = {
let backgroundView = UIVisualEffectView(effect: UIBlurEffect(style: .systemUltraThinMaterial))
backgroundView.alpha = 0.9
backgroundView.layer.masksToBounds = true
backgroundView.layer.cornerRadius = MediaPreviewViewController.closeButtonSize.width * 0.5
return backgroundView
}()
let closeButtonBackgroundVisualEffectView = UIVisualEffectView(effect: UIVibrancyEffect(blurEffect: UIBlurEffect(style: .systemUltraThinMaterial)))
let closeButton: UIButton = {
let button = HighlightDimmableButton()
button.expandEdgeInsets = UIEdgeInsets(top: -10, left: -10, bottom: -10, right: -10)
button.imageView?.tintColor = .label
button.setImage(UIImage(systemName: "xmark", withConfiguration: UIImage.SymbolConfiguration(pointSize: 16, weight: .bold))!, for: .normal)
return button
}()
deinit {
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
}
}
extension MediaPreviewViewController {
override func viewDidLoad() {
super.viewDidLoad()
overrideUserInterfaceStyle = .dark
visualEffectView.frame = view.bounds
visualEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(visualEffectView)
pagingViewController.view.translatesAutoresizingMaskIntoConstraints = false
addChild(pagingViewController)
visualEffectView.contentView.addSubview(pagingViewController.view)
NSLayoutConstraint.activate([
visualEffectView.topAnchor.constraint(equalTo: pagingViewController.view.topAnchor),
visualEffectView.bottomAnchor.constraint(equalTo: pagingViewController.view.bottomAnchor),
visualEffectView.leadingAnchor.constraint(equalTo: pagingViewController.view.leadingAnchor),
visualEffectView.trailingAnchor.constraint(equalTo: pagingViewController.view.trailingAnchor),
])
pagingViewController.didMove(toParent: self)
closeButtonBackground.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(closeButtonBackground)
NSLayoutConstraint.activate([
closeButtonBackground.topAnchor.constraint(equalTo: view.layoutMarginsGuide.topAnchor, constant: 12),
closeButtonBackground.leadingAnchor.constraint(equalTo: view.layoutMarginsGuide.leadingAnchor)
])
closeButtonBackgroundVisualEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
closeButtonBackground.contentView.addSubview(closeButtonBackgroundVisualEffectView)
closeButton.translatesAutoresizingMaskIntoConstraints = false
closeButtonBackgroundVisualEffectView.contentView.addSubview(closeButton)
NSLayoutConstraint.activate([
closeButton.topAnchor.constraint(equalTo: closeButtonBackgroundVisualEffectView.topAnchor),
closeButton.leadingAnchor.constraint(equalTo: closeButtonBackgroundVisualEffectView.leadingAnchor),
closeButtonBackgroundVisualEffectView.trailingAnchor.constraint(equalTo: closeButton.trailingAnchor),
closeButtonBackgroundVisualEffectView.bottomAnchor.constraint(equalTo: closeButton.bottomAnchor),
closeButton.heightAnchor.constraint(equalToConstant: MediaPreviewViewController.closeButtonSize.height).priority(.defaultHigh),
closeButton.widthAnchor.constraint(equalToConstant: MediaPreviewViewController.closeButtonSize.width).priority(.defaultHigh),
])
viewModel.mediaPreviewImageViewControllerDelegate = self
pagingViewController.interPageSpacing = 10
pagingViewController.delegate = self
pagingViewController.dataSource = viewModel
closeButton.addTarget(self, action: #selector(MediaPreviewViewController.closeButtonPressed(_:)), for: .touchUpInside)
// bind view model
viewModel.$currentPage
.receive(on: DispatchQueue.main)
.sink { [weak self] index in
guard let self = self else { return }
switch self.viewModel.transitionItem.source {
case .attachment(_):
break
case .attachments(let mediaGridContainerView):
UIView.animate(withDuration: 0.3) {
mediaGridContainerView.setAlpha(1)
mediaGridContainerView.setAlpha(0, index: index)
}
case .profileAvatar, .profileBanner:
break
}
}
.store(in: &disposeBag)
}
}
extension MediaPreviewViewController {
@objc private func closeButtonPressed(_ sender: UIButton) {
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
dismiss(animated: true, completion: nil)
}
}
// MARK: - MediaPreviewingViewController
extension MediaPreviewViewController: MediaPreviewingViewController {
func isInteractiveDismissible() -> Bool {
if let mediaPreviewImageViewController = pagingViewController.currentViewController as? MediaPreviewImageViewController {
let previewImageView = mediaPreviewImageViewController.previewImageView
// TODO: allow zooming pan dismiss
guard previewImageView.zoomScale == previewImageView.minimumZoomScale else {
return false
}
let safeAreaInsets = previewImageView.safeAreaInsets
let statusBarFrameHeight = view.window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0
let dismissible = previewImageView.contentOffset.y <= -(safeAreaInsets.top - statusBarFrameHeight) + 3 // add 3pt tolerance
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: dismissible %s", ((#file as NSString).lastPathComponent), #line, #function, dismissible ? "true" : "false")
return dismissible
}
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: dismissible false", ((#file as NSString).lastPathComponent), #line, #function)
return false
}
}
// MARK: - PageboyViewControllerDelegate
extension MediaPreviewViewController: PageboyViewControllerDelegate {
func pageboyViewController(
_ pageboyViewController: PageboyViewController,
willScrollToPageAt index: PageboyViewController.PageIndex,
direction: PageboyViewController.NavigationDirection,
animated: Bool
) {
// do nothing
}
func pageboyViewController(
_ pageboyViewController: PageboyViewController,
didScrollTo position: CGPoint,
direction: PageboyViewController.NavigationDirection,
animated: Bool
) {
// do nothing
}
func pageboyViewController(
_ pageboyViewController: PageboyViewController,
didScrollToPageAt index: PageboyViewController.PageIndex,
direction: PageboyViewController.NavigationDirection,
animated: Bool
) {
// update page control
// pageControl.currentPage = index
viewModel.currentPage = index
}
func pageboyViewController(
_ pageboyViewController: PageboyViewController,
didReloadWith currentViewController: UIViewController,
currentPageIndex: PageboyViewController.PageIndex
) {
// do nothing
}
}
// MARK: - MediaPreviewImageViewControllerDelegate
extension MediaPreviewViewController: MediaPreviewImageViewControllerDelegate {
func mediaPreviewImageViewController(_ viewController: MediaPreviewImageViewController, tapGestureRecognizerDidTrigger tapGestureRecognizer: UITapGestureRecognizer) {
// do nothing
}
func mediaPreviewImageViewController(_ viewController: MediaPreviewImageViewController, longPressGestureRecognizerDidTrigger longPressGestureRecognizer: UILongPressGestureRecognizer) {
// do nothing
}
func mediaPreviewImageViewController(
_ viewController: MediaPreviewImageViewController,
contextMenuActionPerform action: MediaPreviewImageViewController.ContextMenuAction
) {
switch action {
case .savePhoto:
let _savePublisher: AnyPublisher<Void, Error>? = {
switch viewController.viewModel.item {
case .remote(let previewContext):
guard let assetURL = previewContext.assetURL else { return nil }
return context.photoLibraryService.save(imageSource: .url(assetURL))
case .local(let previewContext):
return context.photoLibraryService.save(imageSource: .image(previewContext.image))
}
}()
guard let savePublisher = _savePublisher else {
return
}
savePublisher
.sink { [weak self] completion in
guard let self = self else { return }
switch completion {
case .failure(let error):
guard let error = error as? PhotoLibraryService.PhotoLibraryError,
case .noPermission = error else { return }
let alertController = SettingService.openSettingsAlertController(
title: L10n.Common.Alerts.SavePhotoFailure.title,
message: L10n.Common.Alerts.SavePhotoFailure.message
)
self.coordinator.present(
scene: .alertController(alertController: alertController),
from: self,
transition: .alertController(animated: true, completion: nil)
)
case .finished:
break
}
} receiveValue: { _ in
// do nothing
}
.store(in: &context.disposeBag)
case .copyPhoto:
let _copyPublisher: AnyPublisher<Void, Error>? = {
switch viewController.viewModel.item {
case .remote(let previewContext):
guard let assetURL = previewContext.assetURL else { return nil }
return context.photoLibraryService.copy(imageSource: .url(assetURL))
case .local(let previewContext):
return context.photoLibraryService.copy(imageSource: .image(previewContext.image))
}
}()
guard let copyPublisher = _copyPublisher else {
return
}
copyPublisher
.sink { completion in
switch completion {
case .failure(let error):
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: copy photo fail: %s", ((#file as NSString).lastPathComponent), #line, #function, error.localizedDescription)
case .finished:
break
}
} receiveValue: { _ in
// do nothing
}
.store(in: &context.disposeBag)
case .share:
let applicationActivities: [UIActivity] = [
SafariActivity(sceneCoordinator: self.coordinator)
]
let activityViewController = UIActivityViewController(
activityItems: {
var activityItems: [Any] = []
switch viewController.viewModel.item {
case .remote(let previewContext):
if let assetURL = previewContext.assetURL {
activityItems.append(assetURL)
}
case .local(let previewContext):
activityItems.append(previewContext.image)
}
return activityItems
}(),
applicationActivities: applicationActivities
)
activityViewController.popoverPresentationController?.sourceView = viewController.previewImageView.imageView
self.present(activityViewController, animated: true, completion: nil)
}
}
}
extension MediaPreviewViewController {
var closeKeyCommand: UIKeyCommand {
UIKeyCommand(
title: L10n.Scene.Preview.Keyboard.closePreview,
image: nil,
action: #selector(MediaPreviewViewController.closePreviewKeyCommandHandler(_:)),
input: "i",
modifierFlags: [],
propertyList: nil,
alternates: [],
discoverabilityTitle: nil,
attributes: [],
state: .off
)
}
var showNextKeyCommand: UIKeyCommand {
UIKeyCommand(
title: L10n.Scene.Preview.Keyboard.closePreview,
image: nil,
action: #selector(MediaPreviewViewController.showNextKeyCommandHandler(_:)),
input: "j",
modifierFlags: [],
propertyList: nil,
alternates: [],
discoverabilityTitle: nil,
attributes: [],
state: .off
)
}
var showPreviousKeyCommand: UIKeyCommand {
UIKeyCommand(
title: L10n.Scene.Preview.Keyboard.closePreview,
image: nil,
action: #selector(MediaPreviewViewController.showPreviousKeyCommandHandler(_:)),
input: "k",
modifierFlags: [],
propertyList: nil,
alternates: [],
discoverabilityTitle: nil,
attributes: [],
state: .off
)
}
override var keyCommands: [UIKeyCommand] {
return [
closeKeyCommand,
showNextKeyCommand,
showPreviousKeyCommand,
]
}
@objc private func closePreviewKeyCommandHandler(_ sender: UIKeyCommand) {
dismiss(animated: true, completion: nil)
}
@objc private func showNextKeyCommandHandler(_ sender: UIKeyCommand) {
pagingViewController.scrollToPage(.next, animated: true, completion: nil)
}
@objc private func showPreviousKeyCommandHandler(_ sender: UIKeyCommand) {
pagingViewController.scrollToPage(.previous, animated: true, completion: nil)
}
}