378 lines
13 KiB
Swift
378 lines
13 KiB
Swift
//
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// ArticleViewController.swift
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// NetNewsWire
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//
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// Created by Maurice Parker on 4/8/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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import UIKit
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import WebKit
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import Account
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import Articles
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import SafariServices
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class ArticleViewController: UIViewController {
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typealias State = (extractedArticle: ExtractedArticle?,
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isShowingExtractedArticle: Bool,
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articleExtractorButtonState: ArticleExtractorButtonState,
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windowScrollY: Int)
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@IBOutlet private weak var nextUnreadBarButtonItem: UIBarButtonItem!
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@IBOutlet private weak var prevArticleBarButtonItem: UIBarButtonItem!
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@IBOutlet private weak var nextArticleBarButtonItem: UIBarButtonItem!
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@IBOutlet private weak var readBarButtonItem: UIBarButtonItem!
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@IBOutlet private weak var starBarButtonItem: UIBarButtonItem!
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@IBOutlet private weak var actionBarButtonItem: UIBarButtonItem!
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private var pageViewController: UIPageViewController!
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private var currentWebViewController: WebViewController? {
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return pageViewController?.viewControllers?.first as? WebViewController
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}
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private var articleExtractorButton: ArticleExtractorButton = {
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let button = ArticleExtractorButton(type: .system)
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button.frame = CGRect(x: 0, y: 0, width: 44.0, height: 44.0)
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button.setImage(AppAssets.articleExtractorOff, for: .normal)
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return button
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}()
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weak var coordinator: SceneCoordinator!
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var article: Article? {
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didSet {
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if let controller = currentWebViewController, controller.article != article {
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controller.setArticle(article)
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DispatchQueue.main.async {
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// You have to set the view controller to clear out the UIPageViewController child controller cache.
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// You also have to do it in an async call or you will get a strange assertion error.
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self.pageViewController.setViewControllers([controller], direction: .forward, animated: false, completion: nil)
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}
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}
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updateUI()
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}
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}
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var currentState: State? {
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guard let controller = currentWebViewController else { return nil}
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return State(extractedArticle: controller.extractedArticle,
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isShowingExtractedArticle: controller.isShowingExtractedArticle,
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articleExtractorButtonState: controller.articleExtractorButtonState,
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windowScrollY: controller.windowScrollY)
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}
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var restoreState: State?
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private let keyboardManager = KeyboardManager(type: .detail)
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override var keyCommands: [UIKeyCommand]? {
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return keyboardManager.keyCommands
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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NotificationCenter.default.addObserver(self, selector: #selector(unreadCountDidChange(_:)), name: .UnreadCountDidChange, object: nil)
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NotificationCenter.default.addObserver(self, selector: #selector(statusesDidChange(_:)), name: .StatusesDidChange, object: nil)
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NotificationCenter.default.addObserver(self, selector: #selector(contentSizeCategoryDidChange(_:)), name: UIContentSizeCategory.didChangeNotification, object: nil)
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NotificationCenter.default.addObserver(self, selector: #selector(willEnterForeground(_:)), name: UIApplication.willEnterForegroundNotification, object: nil)
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let fullScreenTapZone = UIView()
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NSLayoutConstraint.activate([
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fullScreenTapZone.widthAnchor.constraint(equalToConstant: 150),
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fullScreenTapZone.heightAnchor.constraint(equalToConstant: 44)
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])
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fullScreenTapZone.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(didTapNavigationBar)))
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navigationItem.titleView = fullScreenTapZone
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articleExtractorButton.addTarget(self, action: #selector(toggleArticleExtractor(_:)), for: .touchUpInside)
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toolbarItems?.insert(UIBarButtonItem(customView: articleExtractorButton), at: 6)
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pageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
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pageViewController.delegate = self
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pageViewController.dataSource = self
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// This code is to disallow paging if we scroll from the left edge. If this code is removed
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// PoppableGestureRecognizerDelegate will allow us to both navigate back and page back at the
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// same time. That is really weird when it happens.
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let panGestureRecognizer = UIPanGestureRecognizer()
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panGestureRecognizer.delegate = self
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pageViewController.scrollViewInsidePageControl?.addGestureRecognizer(panGestureRecognizer)
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pageViewController.view.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(pageViewController.view)
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addChild(pageViewController!)
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NSLayoutConstraint.activate([
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view.leadingAnchor.constraint(equalTo: pageViewController.view.leadingAnchor),
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view.trailingAnchor.constraint(equalTo: pageViewController.view.trailingAnchor),
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view.topAnchor.constraint(equalTo: pageViewController.view.topAnchor),
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view.bottomAnchor.constraint(equalTo: pageViewController.view.bottomAnchor)
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])
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let controller: WebViewController
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if let state = restoreState {
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controller = createWebViewController(article, updateView: false)
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controller.extractedArticle = state.extractedArticle
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controller.isShowingExtractedArticle = state.isShowingExtractedArticle
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controller.articleExtractorButtonState = state.articleExtractorButtonState
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controller.windowScrollY = state.windowScrollY
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} else {
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controller = createWebViewController(article, updateView: true)
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}
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articleExtractorButton.buttonState = controller.articleExtractorButtonState
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self.pageViewController.setViewControllers([controller], direction: .forward, animated: false, completion: nil)
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if AppDefaults.articleFullscreenEnabled {
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controller.hideBars()
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}
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updateUI()
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(true)
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coordinator.isArticleViewControllerPending = false
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}
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override func viewSafeAreaInsetsDidChange() {
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// This will animate if the show/hide bars animation is happening.
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view.layoutIfNeeded()
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}
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func updateUI() {
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guard let article = article else {
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articleExtractorButton.isEnabled = false
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nextUnreadBarButtonItem.isEnabled = false
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prevArticleBarButtonItem.isEnabled = false
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nextArticleBarButtonItem.isEnabled = false
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readBarButtonItem.isEnabled = false
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starBarButtonItem.isEnabled = false
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actionBarButtonItem.isEnabled = false
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return
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}
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nextUnreadBarButtonItem.isEnabled = coordinator.isAnyUnreadAvailable
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prevArticleBarButtonItem.isEnabled = coordinator.isPrevArticleAvailable
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nextArticleBarButtonItem.isEnabled = coordinator.isNextArticleAvailable
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readBarButtonItem.isEnabled = true
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starBarButtonItem.isEnabled = true
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let permalinkPresent = article.preferredLink != nil
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articleExtractorButton.isEnabled = permalinkPresent
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actionBarButtonItem.isEnabled = permalinkPresent
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if article.status.read {
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readBarButtonItem.image = AppAssets.circleOpenImage
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readBarButtonItem.isEnabled = article.isAvailableToMarkUnread
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readBarButtonItem.accLabelText = NSLocalizedString("Mark Article Unread", comment: "Mark Article Unread")
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} else {
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readBarButtonItem.image = AppAssets.circleClosedImage
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readBarButtonItem.isEnabled = true
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readBarButtonItem.accLabelText = NSLocalizedString("Selected - Mark Article Unread", comment: "Selected - Mark Article Unread")
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}
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if article.status.starred {
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starBarButtonItem.image = AppAssets.starClosedImage
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starBarButtonItem.accLabelText = NSLocalizedString("Selected - Star Article", comment: "Selected - Star Article")
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} else {
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starBarButtonItem.image = AppAssets.starOpenImage
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starBarButtonItem.accLabelText = NSLocalizedString("Star Article", comment: "Star Article")
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}
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}
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// MARK: Notifications
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@objc dynamic func unreadCountDidChange(_ notification: Notification) {
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updateUI()
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}
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@objc func statusesDidChange(_ note: Notification) {
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guard let articleIDs = note.userInfo?[Account.UserInfoKey.articleIDs] as? Set<String> else {
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return
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}
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guard let article = article else {
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return
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}
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if articleIDs.contains(article.articleID) {
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updateUI()
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}
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}
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@objc func contentSizeCategoryDidChange(_ note: Notification) {
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resetWebViewController()
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}
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@objc func willEnterForeground(_ note: Notification) {
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// The toolbar will come back on you if you don't hide it again
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if AppDefaults.articleFullscreenEnabled {
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currentWebViewController?.hideBars()
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}
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}
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// MARK: Actions
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@objc func didTapNavigationBar() {
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currentWebViewController?.hideBars()
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}
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@objc func showBars(_ sender: Any) {
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currentWebViewController?.showBars()
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}
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@IBAction func toggleArticleExtractor(_ sender: Any) {
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currentWebViewController?.toggleArticleExtractor()
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}
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@IBAction func nextUnread(_ sender: Any) {
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coordinator.selectNextUnread()
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}
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@IBAction func prevArticle(_ sender: Any) {
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coordinator.selectPrevArticle()
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}
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@IBAction func nextArticle(_ sender: Any) {
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coordinator.selectNextArticle()
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}
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@IBAction func toggleRead(_ sender: Any) {
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coordinator.toggleReadForCurrentArticle()
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}
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@IBAction func toggleStar(_ sender: Any) {
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coordinator.toggleStarredForCurrentArticle()
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}
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@IBAction func showActivityDialog(_ sender: Any) {
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currentWebViewController?.showActivityDialog(popOverBarButtonItem: actionBarButtonItem)
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}
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@objc func toggleReaderView(_ sender: Any?) {
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currentWebViewController?.toggleArticleExtractor()
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}
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// MARK: Keyboard Shortcuts
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@objc func navigateToTimeline(_ sender: Any?) {
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coordinator.navigateToTimeline()
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}
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// MARK: API
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func focus() {
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currentWebViewController?.focus()
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}
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func canScrollDown() -> Bool {
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return currentWebViewController?.canScrollDown() ?? false
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}
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func scrollPageDown() {
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currentWebViewController?.scrollPageDown()
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}
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func stopArticleExtractorIfProcessing() {
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currentWebViewController?.stopArticleExtractorIfProcessing()
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}
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func openInAppBrowser() {
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currentWebViewController?.openInAppBrowser()
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}
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}
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// MARK: WebViewControllerDelegate
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extension ArticleViewController: WebViewControllerDelegate {
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func webViewController(_ webViewController: WebViewController, articleExtractorButtonStateDidUpdate buttonState: ArticleExtractorButtonState) {
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if webViewController === currentWebViewController {
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articleExtractorButton.buttonState = buttonState
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}
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}
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}
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// MARK: UIPageViewControllerDataSource
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extension ArticleViewController: UIPageViewControllerDataSource {
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func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
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guard let webViewController = viewController as? WebViewController,
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let currentArticle = webViewController.article,
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let article = coordinator.findPrevArticle(currentArticle) else {
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return nil
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}
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return createWebViewController(article)
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}
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func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
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guard let webViewController = viewController as? WebViewController,
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let currentArticle = webViewController.article,
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let article = coordinator.findNextArticle(currentArticle) else {
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return nil
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}
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return createWebViewController(article)
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}
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}
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// MARK: UIPageViewControllerDelegate
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extension ArticleViewController: UIPageViewControllerDelegate {
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func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
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guard finished, completed else { return }
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guard let article = currentWebViewController?.article else { return }
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coordinator.selectArticle(article, animations: [.select, .scroll, .navigation])
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articleExtractorButton.buttonState = currentWebViewController?.articleExtractorButtonState ?? .off
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previousViewControllers.compactMap({ $0 as? WebViewController }).forEach({ $0.stopWebViewActivity() })
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}
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}
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// MARK: UIGestureRecognizerDelegate
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extension ArticleViewController: UIGestureRecognizerDelegate {
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func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
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return true
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}
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func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
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let point = gestureRecognizer.location(in: nil)
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if point.x > 40 {
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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: Private
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private extension ArticleViewController {
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func createWebViewController(_ article: Article?, updateView: Bool = true) -> WebViewController {
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let controller = WebViewController()
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controller.coordinator = coordinator
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controller.delegate = self
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controller.setArticle(article, updateView: updateView)
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return controller
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}
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func resetWebViewController() {
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coordinator.webViewProvider.flushQueue()
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coordinator.webViewProvider.replenishQueueIfNeeded()
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if let controller = currentWebViewController {
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controller.fullReload()
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self.pageViewController.setViewControllers([controller], direction: .forward, animated: false, completion: nil)
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}
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}
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}
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