NetNewsWire/Multiplatform/Shared/SceneModel.swift

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Swift
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//
// SceneModel.swift
// NetNewsWire
//
// Created by Maurice Parker on 6/28/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import Foundation
import Combine
import Account
import Articles
import RSCore
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final class SceneModel: ObservableObject {
@Published var markAllAsReadButtonState: Bool?
@Published var nextUnreadButtonState: Bool?
@Published var readButtonState: Bool?
@Published var starButtonState: Bool?
@Published var extractorButtonState: ArticleExtractorButtonState?
@Published var openInBrowserButtonState: Bool?
@Published var shareButtonState: Bool?
@Published var accountErrorMessage = ""
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var selectedArticles: [Article] {
timelineModel.selectedArticles
}
private var refreshProgressModel: RefreshProgressModel? = nil
private var articleIconSchemeHandler: ArticleIconSchemeHandler? = nil
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private(set) var webViewProvider: WebViewProvider? = nil
private(set) var sidebarModel = SidebarModel()
private(set) var timelineModel = TimelineModel()
private var selectedArticlesCancellable: AnyCancellable?
// MARK: Initialization API
/// Prepares the SceneModel to be used in the views
func startup() {
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sidebarModel.delegate = self
timelineModel.delegate = self
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self.articleIconSchemeHandler = ArticleIconSchemeHandler(sceneModel: self)
self.webViewProvider = WebViewProvider(articleIconSchemeHandler: self.articleIconSchemeHandler!)
NotificationCenter.default.addObserver(self, selector: #selector(statusesDidChange(_:)), name: .StatusesDidChange, object: nil)
selectedArticlesCancellable = timelineModel.$selectedArticles.sink { [weak self] articles in
self?.updateArticleButtonsState(articles: articles)
}
}
// MARK: Article Management API
func toggleReadStatusForSelectedArticles() {
timelineModel.toggleReadStatusForSelectedArticles()
}
func toggleStarredStatusForSelectedArticles() {
timelineModel.toggleStarredStatusForSelectedArticles()
}
/// Retrieves the article before the given article in the Timeline
func findPrevArticle(_ article: Article) -> Article? {
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return timelineModel.findPrevArticle(article)
}
/// Retrieves the article after the given article in the Timeline
func findNextArticle(_ article: Article) -> Article? {
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return timelineModel.findNextArticle(article)
}
/// Returns the article with the given articleID
func articleFor(_ articleID: String) -> Article? {
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return timelineModel.articleFor(articleID)
}
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}
// MARK: SidebarModelDelegate
extension SceneModel: SidebarModelDelegate {
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func unreadCount(for feed: Feed) -> Int {
// TODO: Get the count from the timeline if Feed is the current timeline
return feed.unreadCount
}
}
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// MARK: TimelineModelDelegate
extension SceneModel: TimelineModelDelegate {
func timelineRequestedWebFeedSelection(_: TimelineModel, webFeed: WebFeed) {
}
}
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// MARK: Private
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private extension SceneModel {
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// MARK: Notifications
@objc func statusesDidChange(_ note: Notification) {
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guard let articleIDs = note.userInfo?[Account.UserInfoKey.articleIDs] as? Set<String> else {
return
}
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let selectedArticleIDs = timelineModel.selectedArticles.map { $0.articleID }
if !articleIDs.intersection(selectedArticleIDs).isEmpty {
updateArticleButtonsState(articles: timelineModel.selectedArticles)
}
}
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// MARK: Button State Updates
func updateArticleButtonsState(articles: [Article]) {
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guard !articles.isEmpty else {
readButtonState = nil
starButtonState = nil
return
}
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if articles.anyArticleIsUnread() {
readButtonState = true
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} else if articles.anyArticleIsReadAndCanMarkUnread() {
readButtonState = false
} else {
readButtonState = nil
}
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if articles.anyArticleIsUnstarred() {
starButtonState = false
} else {
starButtonState = true
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}
if articles.count == 1, articles.first?.preferredLink != nil {
openInBrowserButtonState = true
shareButtonState = true
} else {
openInBrowserButtonState = nil
shareButtonState = nil
}
}
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}