Implement iOS progress view #2162

Multiplatform/Shared/MainApp.swift

@@ -19,6 +19,7 @@ struct MainApp: App {
 	#endif
 	
 	@StateObject private var sceneModel = SceneModel()
+	@StateObject private var refreshProgresModel = RefreshProgressModel()
 	@StateObject private var defaults = AppDefaults.shared
 	@State private var showSheet = false
 	
@@ -28,6 +29,7 @@ struct MainApp: App {
 			SceneNavigationView()
 				.frame(minWidth: 600, idealWidth: 1000, maxWidth: .infinity, minHeight: 600, idealHeight: 700, maxHeight: .infinity)
 				.environmentObject(sceneModel)
+				.environmentObject(refreshProgresModel)
 				.environmentObject(defaults)
 				.sheet(isPresented: $showSheet, onDismiss: { showSheet = false }) {
 					AddWebFeedView()
@@ -153,6 +155,7 @@ struct MainApp: App {
 		WindowGroup {
 			SceneNavigationView()
 				.environmentObject(sceneModel)
+				.environmentObject(refreshProgresModel)
 				.environmentObject(defaults)
 				.modifier(PreferredColorSchemeModifier(preferredColorScheme: defaults.userInterfaceColorPalette))
 		}

Multiplatform/Shared/Previews/PreviewProvider+RefreshProgressModel.swift

@@ -0,0 +1,29 @@
+//
+//  PreviewProvider+RefreshProgressModel.swift
+//  NetNewsWire
+//
+//  Created by Phil Viso on 7/3/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Account
+import Foundation
+import RSWeb
+import SwiftUI
+
+extension PreviewProvider {
+	
+	static func refreshProgressModel(lastRefreshDate: Date?,
+									 tasksCompleted: Int,
+									 totalTasks: Int) -> RefreshProgressModel {
+		return RefreshProgressModel { () -> Date? in
+			return lastRefreshDate
+		} combinedRefreshProgressProvider: { () -> CombinedRefreshProgress in
+			let progress = DownloadProgress(numberOfTasks: totalTasks)
+			progress.numberRemaining = totalTasks - tasksCompleted
+			
+			return CombinedRefreshProgress(downloadProgressArray: [progress])
+		}
+	}
+	
+}

Multiplatform/Shared/Sidebar/RefreshProgressModel.swift

@@ -0,0 +1,101 @@
+//
+//  RefreshProgressModel.swift
+//  NetNewsWire
+//
+//  Created by Phil Viso on 7/2/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Account
+import Combine
+import Foundation
+import SwiftUI
+
+class RefreshProgressModel: ObservableObject {
+	
+	enum State {
+		case refreshProgress(Float)
+		case lastRefreshDateText(String)
+		case none
+	}
+		
+	@Published var state = State.none
+	
+	private static var dateFormatter: RelativeDateTimeFormatter = {
+		let formatter = RelativeDateTimeFormatter()
+		formatter.dateTimeStyle = .named
+		
+		return formatter
+	}()
+		
+	private let lastRefreshDate: () -> Date?
+	private let combinedRefreshProgress: () -> CombinedRefreshProgress
+	
+	private static let lastRefreshDateTextUpdateInterval = 60
+	private static let lastRefreshDateTextRelativeDateFormattingThreshold = 60.0
+	
+	init(lastRefreshDateProvider: @escaping () -> Date?,
+		 combinedRefreshProgressProvider: @escaping () -> CombinedRefreshProgress) {
+		self.lastRefreshDate = lastRefreshDateProvider
+		self.combinedRefreshProgress = combinedRefreshProgressProvider
+		
+		updateState()
+		
+		observeRefreshProgress()
+		scheduleLastRefreshDateTextUpdate()
+	}
+	
+	// MARK: Observing account changes
+	
+	private func observeRefreshProgress() {
+		NotificationCenter.default.addObserver(self, selector: #selector(updateState), name: .AccountRefreshProgressDidChange, object: nil)
+	}
+	
+	// MARK: Refreshing state
+	
+	@objc private func updateState() {
+		let progress = combinedRefreshProgress()
+		
+		if !progress.isComplete {
+			let fractionCompleted = Float(progress.numberCompleted) / Float(progress.numberOfTasks)
+			self.state = .refreshProgress(fractionCompleted)
+		} else if let lastRefreshDate = self.lastRefreshDate() {
+			let text = localizedLastRefreshText(lastRefreshDate: lastRefreshDate)
+			self.state = .lastRefreshDateText(text)
+		} else {
+			self.state = .none
+		}
+	}
+	
+	private func scheduleLastRefreshDateTextUpdate() {
+		DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(Self.lastRefreshDateTextUpdateInterval)) {
+			self.updateState()
+			self.scheduleLastRefreshDateTextUpdate()
+		}
+	}
+	
+	private func localizedLastRefreshText(lastRefreshDate: Date) -> String {
+		let now = Date()
+		
+		if now > lastRefreshDate.addingTimeInterval(Self.lastRefreshDateTextRelativeDateFormattingThreshold) {
+			let localizedDate = Self.dateFormatter.localizedString(for: lastRefreshDate, relativeTo: now)
+			let formatString = NSLocalizedString("Updated %@", comment: "Updated") as NSString
+			
+			return NSString.localizedStringWithFormat(formatString, localizedDate) as String
+		} else {
+			return NSLocalizedString("Updated Just Now", comment: "Updated Just Now")
+		}
+	}
+		
+}
+
+extension RefreshProgressModel {
+	
+	convenience init() {
+		self.init(
+			lastRefreshDateProvider: { AccountManager.shared.lastArticleFetchEndTime },
+			combinedRefreshProgressProvider: { AccountManager.shared.combinedRefreshProgress }
+		)
+	}
+		
+}

Multiplatform/Shared/Sidebar/RefreshProgressView.swift

@@ -0,0 +1,57 @@
+//
+//  RefreshProgressView.swift
+//  NetNewsWire
+//
+//  Created by Phil Viso on 7/2/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import SwiftUI
+
+struct RefreshProgressView: View {
+	
+	@EnvironmentObject var refreshProgressModel: RefreshProgressModel
+	
+	@ViewBuilder var body: some View {
+		switch refreshProgressModel.state {
+		case .refreshProgress(let progress):
+			ProgressView(value: progress)
+				.frame(width: progressViewWidth())
+		case .lastRefreshDateText(let text):
+			Text(text)
+				.lineLimit(1)
+				.font(.caption)
+				.foregroundColor(.secondary)
+		case .none:
+			EmptyView()
+		}
+	}
+	
+	// MARK -
+	
+	private func progressViewWidth() -> CGFloat {
+		#if os(iOS)
+		return 100.0
+		#endif
+		
+		#if os(macOS)
+		return 40.0
+		#endif
+	}
+	
+}
+
+struct RefreshProgressView_Previews: PreviewProvider {
+	static var previews: some View {
+		Group {
+			RefreshProgressView()
+				.environmentObject(refreshProgressModel(lastRefreshDate: nil, tasksCompleted: 1, totalTasks: 2))
+				.previewDisplayName("Refresh in progress")
+						
+			RefreshProgressView()
+				.environmentObject(refreshProgressModel(lastRefreshDate: Date(timeIntervalSinceNow: -120.0), tasksCompleted: 0, totalTasks: 0))
+				.previewDisplayName("Last refreshed with date")
+		}
+		.previewLayout(.sizeThatFits)
+    }
+}

Multiplatform/Shared/Sidebar/SidebarToolbar.swift

@@ -43,10 +43,8 @@ struct SidebarToolbar: View {
 				}).help("Settings")
 				
 				Spacer()
-				
-				Text("Last updated")
-					.font(.caption)
-					.foregroundColor(.secondary)
+								
+				RefreshProgressView()
 				
 				Spacer()
 				
@@ -87,6 +85,19 @@ struct SidebarToolbar: View {
 
 struct SidebarToolbar_Previews: PreviewProvider {
     static var previews: some View {
-        SidebarToolbar()
+		Group {
+			SidebarToolbar()
+				.environmentObject(refreshProgressModel(lastRefreshDate: nil, tasksCompleted: 1, totalTasks: 2))
+				.previewDisplayName("Refresh in progress")
+			
+			SidebarToolbar()
+				.environmentObject(refreshProgressModel(lastRefreshDate: Date(timeIntervalSinceNow: -120.0), tasksCompleted: 0, totalTasks: 0))
+				.previewDisplayName("Last refreshed with date")
+						
+			SidebarToolbar()
+				.environmentObject(refreshProgressModel(lastRefreshDate: nil, tasksCompleted: 0, totalTasks: 0))
+				.previewDisplayName("Refresh progress hidden")
+		}
+		.previewLayout(.sizeThatFits)
     }
 }