Initial widget work

• Latest data is saved out to JSON at various points.
• Technote on widget usage.
• Widget target added.

Multiplatform/Shared/MainApp.swift

@@ -16,6 +16,7 @@ struct MainApp: App {
 	#endif
 	#if os(iOS)
 	@UIApplicationDelegateAdaptor(AppDelegate.self) private var delegate
+	@Environment(\.scenePhase) private var scenePhase
 	#endif
 	
 	@StateObject private var defaults = AppDefaults.shared
@@ -86,6 +87,11 @@ struct MainApp: App {
 			SceneNavigationView()
 				.environmentObject(defaults)
 				.modifier(PreferredColorSchemeModifier(preferredColorScheme: defaults.userInterfaceColorPalette))
+				.onReceive(NotificationCenter.default.publisher(for: UIApplication.didEnterBackgroundNotification)) { _ in
+					print("didEnterBackgroundNotification")
+					appDelegate.refreshWidgetData()
+				}
+				
 		}
 		.commands {
 			CommandGroup(after: .newItem, addition: {
@@ -131,6 +137,18 @@ struct MainApp: App {
 					.keyboardShortcut(.rightArrow, modifiers: [.command])
 			})
 		}
+		.onChange(of: scenePhase, perform: { newPhase in
+			switch newPhase {
+			case .active:
+				print("active")
+			case .inactive:
+				print("inactive")
+			case .background:
+				print("background")
+			@unknown default:
+				print("unknown")
+			}
+		})
 		#endif
 	}
 }

Multiplatform/Shared/Widget Data/WidgetData.swift

@@ -0,0 +1,28 @@
+//
+//  WidgetData.swift
+//  NetNewsWire
+//
+//  Created by Stuart Breckenridge on 10/7/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+
+struct WidgetData: Codable {
+
+	let currentUnreadCount: Int
+	let currentTodayCount: Int
+	let latestArticles: [LatestArticle]
+	let lastUpdateTime: Date
+
+}
+
+struct LatestArticle: Codable {
+
+	let feedTitle: String
+	let articleTitle: String?
+	let articleSummary: String?
+	let feedIcon: Data? // Base64 encoded image data
+	let pubDate: String
+
+}