NetNewsWire/Multiplatform/iOS/Article/ArticleViewController.swift

164 lines
5.0 KiB
Swift

//
// ArticleViewController.swift
// Multiplatform iOS
//
// Created by Maurice Parker on 7/6/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import UIKit
import Combine
import WebKit
import Account
import Articles
import SafariServices
class ArticleViewController: UIViewController {
weak var sceneModel: SceneModel?
private var pageViewController: UIPageViewController!
private var currentWebViewController: WebViewController? {
return pageViewController?.viewControllers?.first as? WebViewController
}
var articles: [Article]? {
didSet {
currentArticle = articles?.first
}
}
var currentArticle: Article? {
didSet {
if let controller = currentWebViewController, controller.article != currentArticle {
controller.setArticle(currentArticle)
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)
}
}
}
}
private var cancellables = Set<AnyCancellable>()
override func viewDidLoad() {
super.viewDidLoad()
pageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: [:])
pageViewController.delegate = self
pageViewController.dataSource = self
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)
])
sceneModel?.timelineModel.selectedArticlesPublisher?.sink { [weak self] articles in
self?.articles = articles
}
.store(in: &cancellables)
let controller = createWebViewController(currentArticle, updateView: true)
self.pageViewController.setViewControllers([controller], direction: .forward, animated: false, completion: nil)
}
// MARK: API
func focus() {
currentWebViewController?.focus()
}
func canScrollDown() -> Bool {
return currentWebViewController?.canScrollDown() ?? false
}
func scrollPageDown() {
currentWebViewController?.scrollPageDown()
}
func stopArticleExtractorIfProcessing() {
currentWebViewController?.stopArticleExtractorIfProcessing()
}
}
// 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 = sceneModel?.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 = sceneModel?.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 }
// articleExtractorButton.buttonState = currentWebViewController?.articleExtractorButtonState ?? .off
previousViewControllers.compactMap({ $0 as? WebViewController }).forEach({ $0.stopWebViewActivity() })
}
}
// MARK: Private
private extension ArticleViewController {
func createWebViewController(_ article: Article?, updateView: Bool = true) -> WebViewController {
let controller = WebViewController()
controller.sceneModel = sceneModel
controller.delegate = self
controller.setArticle(article, updateView: updateView)
return controller
}
}
public extension Notification.Name {
static let FindInArticle = Notification.Name("FindInArticle")
static let EndFindInArticle = Notification.Name("EndFindInArticle")
}