NetNewsWire/iOS/Article/WebViewController.swift

866 lines
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Swift
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//
// WebViewController.swift
// NetNewsWire-iOS
//
// Created by Maurice Parker on 12/28/19.
// Copyright © 2019 Ranchero Software. All rights reserved.
//
import UIKit
import WebKit
import RSCore
import Account
import Articles
import SafariServices
import MessageUI
protocol WebViewControllerDelegate: AnyObject {
func webViewController(_: WebViewController, articleExtractorButtonStateDidUpdate: ArticleExtractorButtonState)
}
class WebViewController: UIViewController {
private struct MessageName {
static let imageWasClicked = "imageWasClicked"
static let imageWasShown = "imageWasShown"
static let showFeedInspector = "showFeedInspector"
}
private var topShowBarsView: UIView!
private var bottomShowBarsView: UIView!
private var topShowBarsViewConstraint: NSLayoutConstraint!
private var bottomShowBarsViewConstraint: NSLayoutConstraint!
private var webView: PreloadedWebView? {
return view.subviews[0] as? PreloadedWebView
}
private lazy var contextMenuInteraction = UIContextMenuInteraction(delegate: self)
private var isFullScreenAvailable: Bool {
return AppDefaults.shared.articleFullscreenAvailable && traitCollection.userInterfaceIdiom == .phone && coordinator.isRootSplitCollapsed
}
private lazy var transition = ImageTransition(controller: self)
private var clickedImageCompletion: (() -> Void)?
private var articleExtractor: ArticleExtractor? = nil
var extractedArticle: ExtractedArticle? {
didSet {
windowScrollY = 0
}
}
var isShowingExtractedArticle = false
var articleExtractorButtonState: ArticleExtractorButtonState = .off {
didSet {
delegate?.webViewController(self, articleExtractorButtonStateDidUpdate: articleExtractorButtonState)
}
}
weak var coordinator: SceneCoordinator!
weak var delegate: WebViewControllerDelegate?
private(set) var article: Article?
let scrollPositionQueue = CoalescingQueue(name: "Article Scroll Position", interval: 0.3, maxInterval: 0.3)
var windowScrollY = 0
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private var restoreWindowScrollY: Int?
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(webFeedIconDidBecomeAvailable(_:)), name: .WebFeedIconDidBecomeAvailable, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(avatarDidBecomeAvailable(_:)), name: .AvatarDidBecomeAvailable, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(faviconDidBecomeAvailable(_:)), name: .FaviconDidBecomeAvailable, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(currentArticleThemeDidChangeNotification(_:)), name: .CurrentArticleThemeDidChangeNotification, object: nil)
// Configure the tap zones
configureTopShowBarsView()
configureBottomShowBarsView()
loadWebView()
}
// MARK: Notifications
@objc func webFeedIconDidBecomeAvailable(_ note: Notification) {
reloadArticleImage()
}
@objc func avatarDidBecomeAvailable(_ note: Notification) {
reloadArticleImage()
}
@objc func faviconDidBecomeAvailable(_ note: Notification) {
reloadArticleImage()
}
@objc func currentArticleThemeDidChangeNotification(_ note: Notification) {
loadWebView()
}
// MARK: Actions
@objc func showBars(_ sender: Any) {
showBars()
}
// MARK: API
func setArticle(_ article: Article?, updateView: Bool = true) {
stopArticleExtractor()
if article != self.article {
self.article = article
if updateView {
if article?.webFeed?.isArticleExtractorAlwaysOn ?? false {
startArticleExtractor()
}
windowScrollY = 0
loadWebView()
}
}
}
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func setScrollPosition(isShowingExtractedArticle: Bool, articleWindowScrollY: Int) {
if isShowingExtractedArticle {
switch articleExtractor?.state {
case .ready:
restoreWindowScrollY = articleWindowScrollY
startArticleExtractor()
case .complete:
windowScrollY = articleWindowScrollY
loadWebView()
case .processing:
restoreWindowScrollY = articleWindowScrollY
default:
restoreWindowScrollY = articleWindowScrollY
startArticleExtractor()
}
} else {
windowScrollY = articleWindowScrollY
loadWebView()
}
}
func focus() {
webView?.becomeFirstResponder()
}
func canScrollDown() -> Bool {
guard let webView = webView else { return false }
return webView.scrollView.contentOffset.y < finalScrollPosition(scrollingUp: false)
}
func canScrollUp() -> Bool {
guard let webView = webView else { return false }
return webView.scrollView.contentOffset.y > finalScrollPosition(scrollingUp: true)
}
private func scrollPage(up scrollingUp: Bool) {
guard let webView = webView else { return }
let overlap = 2 * UIFont.systemFont(ofSize: UIFont.systemFontSize).lineHeight * UIScreen.main.scale
let scrollToY: CGFloat = {
let scrollDistance = webView.scrollView.layoutMarginsGuide.layoutFrame.height - overlap;
let fullScroll = webView.scrollView.contentOffset.y + (scrollingUp ? -scrollDistance : scrollDistance)
let final = finalScrollPosition(scrollingUp: scrollingUp)
return (scrollingUp ? fullScroll > final : fullScroll < final) ? fullScroll : final
}()
let convertedPoint = self.view.convert(CGPoint(x: 0, y: 0), to: webView.scrollView)
let scrollToPoint = CGPoint(x: convertedPoint.x, y: scrollToY)
webView.scrollView.setContentOffset(scrollToPoint, animated: true)
}
func scrollPageDown() {
scrollPage(up: false)
}
func scrollPageUp() {
scrollPage(up: true)
}
func hideClickedImage() {
webView?.evaluateJavaScript("hideClickedImage();")
}
func showClickedImage(completion: @escaping () -> Void) {
clickedImageCompletion = completion
webView?.evaluateJavaScript("showClickedImage();")
}
func fullReload() {
loadWebView(replaceExistingWebView: true)
}
func showBars() {
AppDefaults.shared.articleFullscreenEnabled = false
coordinator.showStatusBar()
topShowBarsViewConstraint?.constant = 0
bottomShowBarsViewConstraint?.constant = 0
navigationController?.setNavigationBarHidden(false, animated: true)
navigationController?.setToolbarHidden(false, animated: true)
configureContextMenuInteraction()
}
func hideBars() {
if isFullScreenAvailable {
AppDefaults.shared.articleFullscreenEnabled = true
coordinator.hideStatusBar()
topShowBarsViewConstraint?.constant = -44.0
bottomShowBarsViewConstraint?.constant = 44.0
navigationController?.setNavigationBarHidden(true, animated: true)
navigationController?.setToolbarHidden(true, animated: true)
configureContextMenuInteraction()
}
}
func toggleArticleExtractor() {
guard let article = article else {
return
}
guard articleExtractor?.state != .processing else {
stopArticleExtractor()
loadWebView()
return
}
guard !isShowingExtractedArticle else {
isShowingExtractedArticle = false
loadWebView()
articleExtractorButtonState = .off
return
}
if let articleExtractor = articleExtractor {
if article.preferredLink == articleExtractor.articleLink {
isShowingExtractedArticle = true
loadWebView()
articleExtractorButtonState = .on
}
} else {
startArticleExtractor()
}
}
func stopArticleExtractorIfProcessing() {
if articleExtractor?.state == .processing {
stopArticleExtractor()
}
}
func stopWebViewActivity() {
if let webView = webView {
stopMediaPlayback(webView)
cancelImageLoad(webView)
}
}
func showActivityDialog(popOverBarButtonItem: UIBarButtonItem? = nil) {
guard let url = article?.preferredURL else { return }
let activityViewController = UIActivityViewController(url: url, title: article?.title, applicationActivities: [FindInArticleActivity(), OpenInBrowserActivity()])
activityViewController.popoverPresentationController?.barButtonItem = popOverBarButtonItem
present(activityViewController, animated: true)
}
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func openInAppBrowser() {
guard let url = article?.preferredURL else { return }
if AppDefaults.shared.useSystemBrowser {
UIApplication.shared.open(url, options: [:])
} else {
let vc = SFSafariViewController(url: url)
present(vc, animated: true)
}
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}
}
// MARK: ArticleExtractorDelegate
extension WebViewController: ArticleExtractorDelegate {
func articleExtractionDidFail(with: Error) {
stopArticleExtractor()
articleExtractorButtonState = .error
loadWebView()
}
func articleExtractionDidComplete(extractedArticle: ExtractedArticle) {
if articleExtractor?.state != .cancelled {
self.extractedArticle = extractedArticle
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if let restoreWindowScrollY = restoreWindowScrollY {
windowScrollY = restoreWindowScrollY
}
isShowingExtractedArticle = true
loadWebView()
articleExtractorButtonState = .on
}
}
}
// MARK: UIContextMenuInteractionDelegate
extension WebViewController: UIContextMenuInteractionDelegate {
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
return UIContextMenuConfiguration(identifier: nil, previewProvider: contextMenuPreviewProvider) { [weak self] suggestedActions in
guard let self = self else { return nil }
var menus = [UIMenu]()
var navActions = [UIAction]()
if let action = self.prevArticleAction() {
navActions.append(action)
}
if let action = self.nextArticleAction() {
navActions.append(action)
}
if !navActions.isEmpty {
menus.append(UIMenu(title: "", options: .displayInline, children: navActions))
}
var toggleActions = [UIAction]()
if let action = self.toggleReadAction() {
toggleActions.append(action)
}
toggleActions.append(self.toggleStarredAction())
menus.append(UIMenu(title: "", options: .displayInline, children: toggleActions))
if let action = self.nextUnreadArticleAction() {
menus.append(UIMenu(title: "", options: .displayInline, children: [action]))
}
menus.append(UIMenu(title: "", options: .displayInline, children: [self.toggleArticleExtractorAction()]))
menus.append(UIMenu(title: "", options: .displayInline, children: [self.shareAction()]))
return UIMenu(title: "", children: menus)
}
}
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
coordinator.showBrowserForCurrentArticle()
}
}
// MARK: WKNavigationDelegate
extension WebViewController: WKNavigationDelegate {
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
for (index, view) in view.subviews.enumerated() {
if index != 0, let oldWebView = view as? PreloadedWebView {
oldWebView.removeFromSuperview()
}
}
}
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
if navigationAction.navigationType == .linkActivated {
guard let url = navigationAction.request.url else {
decisionHandler(.allow)
return
}
let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
if components?.scheme == "http" || components?.scheme == "https" {
decisionHandler(.cancel)
if AppDefaults.shared.useSystemBrowser {
UIApplication.shared.open(url, options: [:])
} else {
UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { didOpen in
guard didOpen == false else {
return
}
let vc = SFSafariViewController(url: url)
self.present(vc, animated: true)
}
}
} else if components?.scheme == "mailto" {
decisionHandler(.cancel)
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guard let emailAddress = url.percentEncodedEmailAddress else {
return
}
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if UIApplication.shared.canOpenURL(emailAddress) {
UIApplication.shared.open(emailAddress, options: [.universalLinksOnly : false], completionHandler: nil)
} else {
let alert = UIAlertController(title: NSLocalizedString("Error", comment: "Error"), message: NSLocalizedString("This device cannot send emails.", comment: "This device cannot send emails."), preferredStyle: .alert)
alert.addAction(.init(title: NSLocalizedString("Dismiss", comment: "Dismiss"), style: .cancel, handler: nil))
self.present(alert, animated: true, completion: nil)
}
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} else if components?.scheme == "tel" {
decisionHandler(.cancel)
if UIApplication.shared.canOpenURL(url) {
UIApplication.shared.open(url, options: [.universalLinksOnly : false], completionHandler: nil)
}
} else {
decisionHandler(.allow)
}
} else {
decisionHandler(.allow)
}
}
func webViewWebContentProcessDidTerminate(_ webView: WKWebView) {
fullReload()
}
}
// MARK: WKUIDelegate
extension WebViewController: WKUIDelegate {
func webView(_ webView: WKWebView, contextMenuForElement elementInfo: WKContextMenuElementInfo, willCommitWithAnimator animator: UIContextMenuInteractionCommitAnimating) {
// We need to have at least an unimplemented WKUIDelegate assigned to the WKWebView. This makes the
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// link preview launch Safari when the link preview is tapped. In theory, you should be able to get
// the link from the elementInfo above and transition to SFSafariViewController instead of launching
// Safari. As the time of this writing, the link in elementInfo is always nil. ¯\_()_/¯
}
func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
guard let url = navigationAction.request.url else {
return nil
}
openURL(url)
return nil
}
}
// MARK: WKScriptMessageHandler
extension WebViewController: WKScriptMessageHandler {
func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
switch message.name {
case MessageName.imageWasShown:
clickedImageCompletion?()
case MessageName.imageWasClicked:
imageWasClicked(body: message.body as? String)
case MessageName.showFeedInspector:
if let webFeed = article?.webFeed {
coordinator.showFeedInspector(for: webFeed)
}
default:
return
}
}
}
// MARK: UIViewControllerTransitioningDelegate
extension WebViewController: UIViewControllerTransitioningDelegate {
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transition.presenting = true
return transition
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transition.presenting = false
return transition
}
}
// MARK:
extension WebViewController: UIScrollViewDelegate {
func scrollViewDidScroll(_ scrollView: UIScrollView) {
scrollPositionQueue.add(self, #selector(scrollPositionDidChange))
}
@objc func scrollPositionDidChange() {
webView?.evaluateJavaScript("window.scrollY") { (scrollY, error) in
guard error == nil else { return }
let javascriptScrollY = scrollY as? Int ?? 0
// I don't know why this value gets returned sometimes, but it is in error
guard javascriptScrollY != 33554432 else { return }
self.windowScrollY = javascriptScrollY
}
}
}
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// MARK: JSON
private struct ImageClickMessage: Codable {
let x: Float
let y: Float
let width: Float
let height: Float
let imageTitle: String?
let imageURL: String
}
// MARK: Private
private extension WebViewController {
func loadWebView(replaceExistingWebView: Bool = false) {
guard isViewLoaded else { return }
if !replaceExistingWebView, let webView = webView {
self.renderPage(webView)
return
}
coordinator.webViewProvider.dequeueWebView() { webView in
webView.ready {
// Add the webview
webView.translatesAutoresizingMaskIntoConstraints = false
self.view.insertSubview(webView, at: 0)
NSLayoutConstraint.activate([
self.view.leadingAnchor.constraint(equalTo: webView.leadingAnchor),
self.view.trailingAnchor.constraint(equalTo: webView.trailingAnchor),
self.view.topAnchor.constraint(equalTo: webView.topAnchor),
self.view.bottomAnchor.constraint(equalTo: webView.bottomAnchor)
])
// UISplitViewController reports the wrong size to WKWebView which can cause horizontal
// rubberbanding on the iPad. This interferes with our UIPageViewController preventing
// us from easily swiping between WKWebViews. This hack fixes that.
webView.scrollView.contentInset = UIEdgeInsets(top: 0, left: -1, bottom: 0, right: 0)
webView.scrollView.setZoomScale(1.0, animated: false)
self.view.setNeedsLayout()
self.view.layoutIfNeeded()
// Configure the webview
webView.navigationDelegate = self
webView.uiDelegate = self
webView.scrollView.delegate = self
self.configureContextMenuInteraction()
webView.configuration.userContentController.add(WrapperScriptMessageHandler(self), name: MessageName.imageWasClicked)
webView.configuration.userContentController.add(WrapperScriptMessageHandler(self), name: MessageName.imageWasShown)
webView.configuration.userContentController.add(WrapperScriptMessageHandler(self), name: MessageName.showFeedInspector)
self.renderPage(webView)
}
}
}
func renderPage(_ webView: PreloadedWebView?) {
guard let webView = webView else { return }
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let theme = ArticleThemesManager.shared.currentTheme
let rendering: ArticleRenderer.Rendering
if let articleExtractor = articleExtractor, articleExtractor.state == .processing {
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rendering = ArticleRenderer.loadingHTML(theme: theme)
} else if let articleExtractor = articleExtractor, articleExtractor.state == .failedToParse, let article = article {
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rendering = ArticleRenderer.articleHTML(article: article, theme: theme)
} else if let article = article, let extractedArticle = extractedArticle {
if isShowingExtractedArticle {
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rendering = ArticleRenderer.articleHTML(article: article, extractedArticle: extractedArticle, theme: theme)
} else {
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rendering = ArticleRenderer.articleHTML(article: article, theme: theme)
}
} else if let article = article {
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rendering = ArticleRenderer.articleHTML(article: article, theme: theme)
} else {
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rendering = ArticleRenderer.noSelectionHTML(theme: theme)
}
let substitutions = [
"title": rendering.title,
"baseURL": rendering.baseURL,
"style": rendering.style,
"body": rendering.html,
"windowScrollY": String(windowScrollY)
]
let html = try! MacroProcessor.renderedText(withTemplate: ArticleRenderer.page.html, substitutions: substitutions)
webView.loadHTMLString(html, baseURL: ArticleRenderer.page.baseURL)
}
func finalScrollPosition(scrollingUp: Bool) -> CGFloat {
guard let webView = webView else { return 0 }
if scrollingUp {
return -webView.scrollView.safeAreaInsets.top
} else {
return webView.scrollView.contentSize.height - webView.scrollView.bounds.height + webView.scrollView.safeAreaInsets.bottom
}
}
func startArticleExtractor() {
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guard articleExtractor == nil else { return }
if let link = article?.preferredLink, let extractor = ArticleExtractor(link) {
extractor.delegate = self
extractor.process()
articleExtractor = extractor
articleExtractorButtonState = .animated
}
}
func stopArticleExtractor() {
articleExtractor?.cancel()
articleExtractor = nil
isShowingExtractedArticle = false
articleExtractorButtonState = .off
}
func reloadArticleImage() {
guard let article = article else { return }
var components = URLComponents()
components.scheme = ArticleRenderer.imageIconScheme
components.path = article.articleID
if let imageSrc = components.string {
webView?.evaluateJavaScript("reloadArticleImage(\"\(imageSrc)\")")
}
}
func imageWasClicked(body: String?) {
guard let webView = webView,
let body = body,
let data = body.data(using: .utf8),
let clickMessage = try? JSONDecoder().decode(ImageClickMessage.self, from: data),
let range = clickMessage.imageURL.range(of: ";base64,")
else { return }
let base64Image = String(clickMessage.imageURL.suffix(from: range.upperBound))
if let imageData = Data(base64Encoded: base64Image), let image = UIImage(data: imageData) {
let y = CGFloat(clickMessage.y) + webView.safeAreaInsets.top
let rect = CGRect(x: CGFloat(clickMessage.x), y: y, width: CGFloat(clickMessage.width), height: CGFloat(clickMessage.height))
transition.originFrame = webView.convert(rect, to: nil)
if navigationController?.navigationBar.isHidden ?? false {
transition.maskFrame = webView.convert(webView.frame, to: nil)
} else {
transition.maskFrame = webView.convert(webView.safeAreaLayoutGuide.layoutFrame, to: nil)
}
transition.originImage = image
coordinator.showFullScreenImage(image: image, imageTitle: clickMessage.imageTitle, transitioningDelegate: self)
}
}
func stopMediaPlayback(_ webView: WKWebView) {
webView.evaluateJavaScript("stopMediaPlayback();")
}
func cancelImageLoad(_ webView: WKWebView) {
webView.evaluateJavaScript("cancelImageLoad();")
}
func configureTopShowBarsView() {
topShowBarsView = UIView()
topShowBarsView.backgroundColor = .clear
topShowBarsView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(topShowBarsView)
if AppDefaults.shared.articleFullscreenEnabled {
topShowBarsViewConstraint = view.topAnchor.constraint(equalTo: topShowBarsView.bottomAnchor, constant: -44.0)
} else {
topShowBarsViewConstraint = view.topAnchor.constraint(equalTo: topShowBarsView.bottomAnchor, constant: 0.0)
}
NSLayoutConstraint.activate([
topShowBarsViewConstraint,
view.leadingAnchor.constraint(equalTo: topShowBarsView.leadingAnchor),
view.trailingAnchor.constraint(equalTo: topShowBarsView.trailingAnchor),
topShowBarsView.heightAnchor.constraint(equalToConstant: 44.0)
])
topShowBarsView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(showBars(_:))))
}
func configureBottomShowBarsView() {
bottomShowBarsView = UIView()
topShowBarsView.backgroundColor = .clear
bottomShowBarsView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(bottomShowBarsView)
if AppDefaults.shared.articleFullscreenEnabled {
bottomShowBarsViewConstraint = view.bottomAnchor.constraint(equalTo: bottomShowBarsView.topAnchor, constant: 44.0)
} else {
bottomShowBarsViewConstraint = view.bottomAnchor.constraint(equalTo: bottomShowBarsView.topAnchor, constant: 0.0)
}
NSLayoutConstraint.activate([
bottomShowBarsViewConstraint,
view.leadingAnchor.constraint(equalTo: bottomShowBarsView.leadingAnchor),
view.trailingAnchor.constraint(equalTo: bottomShowBarsView.trailingAnchor),
bottomShowBarsView.heightAnchor.constraint(equalToConstant: 44.0)
])
bottomShowBarsView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(showBars(_:))))
}
func configureContextMenuInteraction() {
if isFullScreenAvailable {
if navigationController?.isNavigationBarHidden ?? false {
webView?.addInteraction(contextMenuInteraction)
} else {
webView?.removeInteraction(contextMenuInteraction)
}
}
}
func contextMenuPreviewProvider() -> UIViewController {
let previewProvider = UIStoryboard.main.instantiateController(ofType: ContextMenuPreviewViewController.self)
previewProvider.article = article
return previewProvider
}
func prevArticleAction() -> UIAction? {
guard coordinator.isPrevArticleAvailable else { return nil }
let title = NSLocalizedString("Previous Article", comment: "Previous Article")
return UIAction(title: title, image: AppAssets.prevArticleImage) { [weak self] action in
self?.coordinator.selectPrevArticle()
}
}
func nextArticleAction() -> UIAction? {
guard coordinator.isNextArticleAvailable else { return nil }
let title = NSLocalizedString("Next Article", comment: "Next Article")
return UIAction(title: title, image: AppAssets.nextArticleImage) { [weak self] action in
self?.coordinator.selectNextArticle()
}
}
func toggleReadAction() -> UIAction? {
guard let article = article, !article.status.read || article.isAvailableToMarkUnread else { return nil }
let title = article.status.read ? NSLocalizedString("Mark as Unread", comment: "Mark as Unread") : NSLocalizedString("Mark as Read", comment: "Mark as Read")
let readImage = article.status.read ? AppAssets.circleClosedImage : AppAssets.circleOpenImage
return UIAction(title: title, image: readImage) { [weak self] action in
self?.coordinator.toggleReadForCurrentArticle()
}
}
func toggleStarredAction() -> UIAction {
let starred = article?.status.starred ?? false
let title = starred ? NSLocalizedString("Mark as Unstarred", comment: "Mark as Unstarred") : NSLocalizedString("Mark as Starred", comment: "Mark as Starred")
let starredImage = starred ? AppAssets.starOpenImage : AppAssets.starClosedImage
return UIAction(title: title, image: starredImage) { [weak self] action in
self?.coordinator.toggleStarredForCurrentArticle()
}
}
func nextUnreadArticleAction() -> UIAction? {
guard coordinator.isAnyUnreadAvailable else { return nil }
let title = NSLocalizedString("Next Unread Article", comment: "Next Unread Article")
return UIAction(title: title, image: AppAssets.nextUnreadArticleImage) { [weak self] action in
self?.coordinator.selectNextUnread()
}
}
func toggleArticleExtractorAction() -> UIAction {
let extracted = articleExtractorButtonState == .on
let title = extracted ? NSLocalizedString("Show Feed Article", comment: "Show Feed Article") : NSLocalizedString("Show Reader View", comment: "Show Reader View")
let extractorImage = extracted ? AppAssets.articleExtractorOffSF : AppAssets.articleExtractorOnSF
return UIAction(title: title, image: extractorImage) { [weak self] action in
self?.toggleArticleExtractor()
}
}
func shareAction() -> UIAction {
let title = NSLocalizedString("Share", comment: "Share")
return UIAction(title: title, image: AppAssets.shareImage) { [weak self] action in
self?.showActivityDialog()
}
}
// If the resource cannot be opened with an installed app, present the web view.
func openURL(_ url: URL) {
UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { didOpen in
assert(Thread.isMainThread)
guard didOpen == false else {
return
}
let vc = SFSafariViewController(url: url)
self.present(vc, animated: true)
}
}
}
// MARK: Find in Article
private struct FindInArticleOptions: Codable {
var text: String
var caseSensitive = false
var regex = false
}
internal struct FindInArticleState: Codable {
struct WebViewClientRect: Codable {
let x: Double
let y: Double
let width: Double
let height: Double
}
struct FindInArticleResult: Codable {
let rects: [WebViewClientRect]
let bounds: WebViewClientRect
let index: UInt
let matchGroups: [String]
}
let index: UInt?
let results: [FindInArticleResult]
let count: UInt
}
extension WebViewController {
func searchText(_ searchText: String, completionHandler: @escaping (FindInArticleState) -> Void) {
guard let json = try? JSONEncoder().encode(FindInArticleOptions(text: searchText)) else {
return
}
let encoded = json.base64EncodedString()
webView?.evaluateJavaScript("updateFind(\"\(encoded)\")") {
(result, error) in
guard error == nil,
let b64 = result as? String,
let rawData = Data(base64Encoded: b64),
let findState = try? JSONDecoder().decode(FindInArticleState.self, from: rawData) else {
return
}
completionHandler(findState)
}
}
func endSearch() {
webView?.evaluateJavaScript("endFind()")
}
func selectNextSearchResult() {
webView?.evaluateJavaScript("selectNextResult()")
}
func selectPreviousSearchResult() {
webView?.evaluateJavaScript("selectPreviousResult()")
}
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}