691 lines
22 KiB
Swift
691 lines
22 KiB
Swift
//
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// WebViewController.swift
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// NetNewsWire-iOS
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//
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// Created by Maurice Parker on 12/28/19.
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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 RSCore
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import Account
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import Articles
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import SafariServices
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protocol WebViewControllerDelegate: class {
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func webViewController(_: WebViewController, articleExtractorButtonStateDidUpdate: ArticleExtractorButtonState)
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}
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class WebViewController: UIViewController {
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private struct MessageName {
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static let imageWasClicked = "imageWasClicked"
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static let imageWasShown = "imageWasShown"
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}
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private var topShowBarsView: UIView!
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private var bottomShowBarsView: UIView!
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private var topShowBarsViewConstraint: NSLayoutConstraint!
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private var bottomShowBarsViewConstraint: NSLayoutConstraint!
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private var webView: WKWebView? {
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return view.subviews[0] as? WKWebView
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}
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private lazy var contextMenuInteraction = UIContextMenuInteraction(delegate: self)
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private var isFullScreenAvailable: Bool {
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return AppDefaults.articleFullscreenAvailable && traitCollection.userInterfaceIdiom == .phone && coordinator.isRootSplitCollapsed
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}
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private lazy var transition = ImageTransition(controller: self)
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private var clickedImageCompletion: (() -> Void)?
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private var articleExtractor: ArticleExtractor? = nil
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var extractedArticle: ExtractedArticle? {
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didSet {
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windowScrollY = 0
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}
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}
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var isShowingExtractedArticle = false
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var articleExtractorButtonState: ArticleExtractorButtonState = .off {
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didSet {
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delegate?.webViewController(self, articleExtractorButtonStateDidUpdate: articleExtractorButtonState)
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}
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}
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weak var coordinator: SceneCoordinator!
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weak var delegate: WebViewControllerDelegate?
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var article: Article? {
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didSet {
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stopArticleExtractor()
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if article?.webFeed?.isArticleExtractorAlwaysOn ?? false {
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startArticleExtractor()
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}
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if article != oldValue {
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windowScrollY = 0
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loadWebView()
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}
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}
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}
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let scrollPositionQueue = CoalescingQueue(name: "Article Scroll Position", interval: 0.3, maxInterval: 1.0)
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var windowScrollY = 0
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deinit {
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recycleWebView(webView)
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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(webFeedIconDidBecomeAvailable(_:)), name: .WebFeedIconDidBecomeAvailable, object: nil)
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NotificationCenter.default.addObserver(self, selector: #selector(avatarDidBecomeAvailable(_:)), name: .AvatarDidBecomeAvailable, object: nil)
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NotificationCenter.default.addObserver(self, selector: #selector(faviconDidBecomeAvailable(_:)), name: .FaviconDidBecomeAvailable, object: nil)
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// Configure the tap zones
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configureTopShowBarsView()
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configureBottomShowBarsView()
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loadWebView()
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}
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// MARK: Notifications
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@objc func webFeedIconDidBecomeAvailable(_ note: Notification) {
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reloadArticleImage()
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}
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@objc func avatarDidBecomeAvailable(_ note: Notification) {
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reloadArticleImage()
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}
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@objc func faviconDidBecomeAvailable(_ note: Notification) {
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reloadArticleImage()
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}
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// MARK: Actions
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@objc func showBars(_ sender: Any) {
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showBars()
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}
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// MARK: API
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func focus() {
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webView?.becomeFirstResponder()
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}
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func canScrollDown() -> Bool {
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guard let webView = webView else { return false }
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return webView.scrollView.contentOffset.y < finalScrollPosition()
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}
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func scrollPageDown() {
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guard let webView = webView else { return }
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let scrollToY: CGFloat = {
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let fullScroll = webView.scrollView.contentOffset.y + webView.scrollView.layoutMarginsGuide.layoutFrame.height
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let final = finalScrollPosition()
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return fullScroll < final ? fullScroll : final
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}()
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let convertedPoint = self.view.convert(CGPoint(x: 0, y: 0), to: webView.scrollView)
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let scrollToPoint = CGPoint(x: convertedPoint.x, y: scrollToY)
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webView.scrollView.setContentOffset(scrollToPoint, animated: true)
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}
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func hideClickedImage() {
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webView?.evaluateJavaScript("hideClickedImage();")
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}
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func showClickedImage(completion: @escaping () -> Void) {
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clickedImageCompletion = completion
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webView?.evaluateJavaScript("showClickedImage();")
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}
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func fullReload() {
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self.loadWebView()
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}
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func showBars() {
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AppDefaults.articleFullscreenEnabled = false
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coordinator.showStatusBar()
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topShowBarsViewConstraint?.constant = 0
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bottomShowBarsViewConstraint?.constant = 0
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navigationController?.setNavigationBarHidden(false, animated: true)
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navigationController?.setToolbarHidden(false, animated: true)
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configureContextMenuInteraction()
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}
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func hideBars() {
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if isFullScreenAvailable {
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AppDefaults.articleFullscreenEnabled = true
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coordinator.hideStatusBar()
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topShowBarsViewConstraint?.constant = -44.0
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bottomShowBarsViewConstraint?.constant = 44.0
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navigationController?.setNavigationBarHidden(true, animated: true)
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navigationController?.setToolbarHidden(true, animated: true)
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configureContextMenuInteraction()
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}
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}
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func toggleArticleExtractor() {
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guard let article = article else {
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return
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}
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guard articleExtractor?.state != .processing else {
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stopArticleExtractor()
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loadWebView()
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return
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}
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guard !isShowingExtractedArticle else {
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isShowingExtractedArticle = false
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loadWebView()
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articleExtractorButtonState = .off
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return
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}
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if let articleExtractor = articleExtractor {
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if article.preferredLink == articleExtractor.articleLink {
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isShowingExtractedArticle = true
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loadWebView()
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articleExtractorButtonState = .on
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}
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} else {
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startArticleExtractor()
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}
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}
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func stopArticleExtractorIfProcessing() {
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if articleExtractor?.state == .processing {
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stopArticleExtractor()
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}
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}
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func stopWebViewActivity() {
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if let webView = webView {
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stopMediaPlayback(webView)
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cancelImageLoad(webView)
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}
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}
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func showActivityDialog(popOverBarButtonItem: UIBarButtonItem? = nil) {
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guard let preferredLink = article?.preferredLink, let url = URL(string: preferredLink) else {
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return
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}
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let activityViewController = UIActivityViewController(url: url, title: article?.title, applicationActivities: [OpenInSafariActivity()])
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activityViewController.popoverPresentationController?.barButtonItem = popOverBarButtonItem
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present(activityViewController, animated: true)
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}
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}
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// MARK: ArticleExtractorDelegate
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extension WebViewController: ArticleExtractorDelegate {
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func articleExtractionDidFail(with: Error) {
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stopArticleExtractor()
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articleExtractorButtonState = .error
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loadWebView()
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}
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func articleExtractionDidComplete(extractedArticle: ExtractedArticle) {
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if articleExtractor?.state != .cancelled {
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self.extractedArticle = extractedArticle
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isShowingExtractedArticle = true
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loadWebView()
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articleExtractorButtonState = .on
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}
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}
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}
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// MARK: UIContextMenuInteractionDelegate
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extension WebViewController: UIContextMenuInteractionDelegate {
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func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
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return UIContextMenuConfiguration(identifier: nil, previewProvider: contextMenuPreviewProvider) { [weak self] suggestedActions in
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guard let self = self else { return nil }
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var actions = [UIAction]()
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if let action = self.prevArticleAction() {
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actions.append(action)
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}
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if let action = self.nextArticleAction() {
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actions.append(action)
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}
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if let action = self.toggleReadAction() {
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actions.append(action)
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}
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actions.append(self.toggleStarredAction())
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if let action = self.nextUnreadArticleAction() {
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actions.append(action)
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}
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actions.append(self.toggleArticleExtractorAction())
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actions.append(self.shareAction())
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return UIMenu(title: "", children: actions)
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}
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}
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func contextMenuInteraction(_ interaction: UIContextMenuInteraction, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
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coordinator.showBrowserForCurrentArticle()
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}
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}
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// MARK: WKNavigationDelegate
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extension WebViewController: WKNavigationDelegate {
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func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
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if navigationAction.navigationType == .linkActivated {
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guard let url = navigationAction.request.url else {
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decisionHandler(.allow)
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return
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}
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let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
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if components?.scheme == "http" || components?.scheme == "https" {
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decisionHandler(.cancel)
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// If the resource cannot be opened with an installed app, present the web view.
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UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { didOpen in
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assert(Thread.isMainThread)
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guard didOpen == false else {
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return
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}
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let vc = SFSafariViewController(url: url)
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self.present(vc, animated: true)
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}
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} else {
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decisionHandler(.allow)
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}
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} else {
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decisionHandler(.allow)
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}
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}
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}
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// MARK: WKUIDelegate
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extension WebViewController: WKUIDelegate {
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func webView(_ webView: WKWebView, contextMenuForElement elementInfo: WKContextMenuElementInfo, willCommitWithAnimator animator: UIContextMenuInteractionCommitAnimating) {
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// 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 shoud be able to get
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// the link from the elementInfo above and transition to SFSafariViewController instead of launching
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// Safari. As the time of this writing, the link in elementInfo is always nil. ¯\_(ツ)_/¯
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}
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}
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// MARK: WKScriptMessageHandler
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extension WebViewController: WKScriptMessageHandler {
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func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
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switch message.name {
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case MessageName.imageWasShown:
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clickedImageCompletion?()
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case MessageName.imageWasClicked:
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imageWasClicked(body: message.body as? String)
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default:
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return
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}
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}
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}
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// MARK: UIViewControllerTransitioningDelegate
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extension WebViewController: UIViewControllerTransitioningDelegate {
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func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
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transition.presenting = true
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return transition
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}
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func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
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transition.presenting = false
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return transition
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}
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}
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// MARK:
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extension WebViewController: UIScrollViewDelegate {
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func scrollViewDidScroll(_ scrollView: UIScrollView) {
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scrollPositionQueue.add(self, #selector(scrollPositionDidChange))
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}
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@objc func scrollPositionDidChange() {
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webView?.evaluateJavaScript("window.scrollY") { (scrollY, _) in
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self.windowScrollY = scrollY as? Int ?? 0
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}
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}
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}
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// MARK: JSON
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private struct TemplateData: Codable {
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let style: String
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let body: String
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let title: String
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let baseURL: String
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}
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private struct ImageClickMessage: Codable {
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let x: Float
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let y: Float
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let width: Float
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let height: Float
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let imageTitle: String?
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let imageURL: String
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}
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// MARK: Private
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private extension WebViewController {
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func loadWebView() {
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guard isViewLoaded else { return }
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coordinator.webViewProvider.dequeueWebView() { webView in
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let webViewToRecycle = self.webView
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self.renderPage(webViewToRecycle)
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// Add the webview
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webView.translatesAutoresizingMaskIntoConstraints = false
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self.view.insertSubview(webView, at: 0)
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NSLayoutConstraint.activate([
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self.view.leadingAnchor.constraint(equalTo: webView.leadingAnchor),
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self.view.trailingAnchor.constraint(equalTo: webView.trailingAnchor),
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self.view.topAnchor.constraint(equalTo: webView.topAnchor),
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self.view.bottomAnchor.constraint(equalTo: webView.bottomAnchor)
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])
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// UISplitViewController reports the wrong size to WKWebView which can cause horizontal
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// rubberbanding on the iPad. This interferes with our UIPageViewController preventing
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// us from easily swiping between WKWebViews. This hack fixes that.
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webView.scrollView.contentInset = UIEdgeInsets(top: 0, left: -1, bottom: 0, right: 0)
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webView.scrollView.setZoomScale(1.0, animated: false)
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self.view.setNeedsLayout()
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self.view.layoutIfNeeded()
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// Configure the webview
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webView.navigationDelegate = self
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webView.uiDelegate = self
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webView.scrollView.delegate = self
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self.configureContextMenuInteraction()
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webView.configuration.userContentController.add(WrapperScriptMessageHandler(self), name: MessageName.imageWasClicked)
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webView.configuration.userContentController.add(WrapperScriptMessageHandler(self), name: MessageName.imageWasShown)
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self.renderPage(webView)
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DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
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self.recycleWebView(webViewToRecycle)
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}
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}
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}
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func recycleWebView(_ webView: WKWebView?) {
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guard let webView = webView else { return }
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webView.removeFromSuperview()
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stopMediaPlayback(webView)
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cancelImageLoad(webView)
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webView.navigationDelegate = nil
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webView.uiDelegate = nil
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webView.scrollView.delegate = nil
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webView.configuration.userContentController.removeScriptMessageHandler(forName: MessageName.imageWasClicked)
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webView.configuration.userContentController.removeScriptMessageHandler(forName: MessageName.imageWasShown)
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webView.interactions.removeAll()
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coordinator.webViewProvider.enqueueWebView(webView)
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}
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func renderPage(_ webView: WKWebView?) {
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guard let webView = webView else { return }
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let style = ArticleStylesManager.shared.currentStyle
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let rendering: ArticleRenderer.Rendering
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if let articleExtractor = articleExtractor, articleExtractor.state == .processing {
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rendering = ArticleRenderer.loadingHTML(style: style)
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} else if let articleExtractor = articleExtractor, articleExtractor.state == .failedToParse, let article = article {
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rendering = ArticleRenderer.articleHTML(article: article, style: style)
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} else if let article = article, let extractedArticle = extractedArticle {
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if isShowingExtractedArticle {
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rendering = ArticleRenderer.articleHTML(article: article, extractedArticle: extractedArticle, style: style)
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} else {
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rendering = ArticleRenderer.articleHTML(article: article, style: style)
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}
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} else if let article = article {
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rendering = ArticleRenderer.articleHTML(article: article, style: style)
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} else {
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rendering = ArticleRenderer.noSelectionHTML(style: style)
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}
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let templateData = TemplateData(style: rendering.style, body: rendering.html, title: rendering.title, baseURL: rendering.baseURL)
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let encoder = JSONEncoder()
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var render = "error();"
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if let data = try? encoder.encode(templateData) {
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let json = String(data: data, encoding: .utf8)!
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render = "render(\(json), \(windowScrollY));"
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}
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windowScrollY = 0
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webView.evaluateJavaScript(render)
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}
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func finalScrollPosition() -> CGFloat {
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guard let webView = webView else { return 0 }
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return webView.scrollView.contentSize.height - webView.scrollView.bounds.height + webView.scrollView.safeAreaInsets.bottom
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}
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func startArticleExtractor() {
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if let link = article?.preferredLink, let extractor = ArticleExtractor(link) {
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extractor.delegate = self
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extractor.process()
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articleExtractor = extractor
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articleExtractorButtonState = .animated
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}
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}
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func stopArticleExtractor() {
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articleExtractor?.cancel()
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articleExtractor = nil
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isShowingExtractedArticle = false
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articleExtractorButtonState = .off
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}
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func reloadArticleImage() {
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guard let article = article else { return }
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var components = URLComponents()
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components.scheme = ArticleRenderer.imageIconScheme
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components.path = article.articleID
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if let imageSrc = components.string {
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webView?.evaluateJavaScript("reloadArticleImage(\"\(imageSrc)\")")
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}
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}
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func imageWasClicked(body: String?) {
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guard let webView = webView,
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let body = body,
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let data = body.data(using: .utf8),
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let clickMessage = try? JSONDecoder().decode(ImageClickMessage.self, from: data),
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let range = clickMessage.imageURL.range(of: ";base64,")
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else { return }
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let base64Image = String(clickMessage.imageURL.suffix(from: range.upperBound))
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if let imageData = Data(base64Encoded: base64Image), let image = UIImage(data: imageData) {
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let y = CGFloat(clickMessage.y) + webView.safeAreaInsets.top
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let rect = CGRect(x: CGFloat(clickMessage.x), y: y, width: CGFloat(clickMessage.width), height: CGFloat(clickMessage.height))
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transition.originFrame = webView.convert(rect, to: nil)
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if navigationController?.navigationBar.isHidden ?? false {
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transition.maskFrame = webView.convert(webView.frame, to: nil)
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} else {
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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.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.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()
|
|
}
|
|
}
|
|
|
|
}
|