NetNewsWire/iOS/Article/ArticleViewController.swift

378 lines
13 KiB
Swift

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