Dactyloidae iOS initial commit

mobile/ios/Client/Frontend/Browser/NightModeHelper.swift

@@ -0,0 +1,58 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import WebKit
+import Shared
+
+struct NightModePrefsKey {
+    static let NightModeButtonIsInMenu = PrefsKeys.KeyNightModeButtonIsInMenu
+    static let NightModeStatus = PrefsKeys.KeyNightModeStatus
+}
+
+class NightModeHelper: TabContentScript {
+    fileprivate weak var tab: Tab?
+
+    required init(tab: Tab) {
+        self.tab = tab
+        if let path = Bundle.main.path(forResource: "NightModeHelper", ofType: "js"), let source = try? NSString(contentsOfFile: path, encoding: String.Encoding.utf8.rawValue) as String {
+            let userScript = WKUserScript(source: source, injectionTime: WKUserScriptInjectionTime.atDocumentStart, forMainFrameOnly: true)
+            tab.webView!.configuration.userContentController.addUserScript(userScript)
+        }
+    }
+
+    static func name() -> String {
+        return "NightMode"
+    }
+
+    func scriptMessageHandlerName() -> String? {
+        return "NightMode"
+    }
+
+    func userContentController(_ userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {
+        // Do nothing.
+    }
+
+    static func toggle(_ prefs: Prefs, tabManager: TabManager) {
+        let isActive = prefs.boolForKey(NightModePrefsKey.NightModeStatus) ?? false
+        setNightMode(prefs, tabManager: tabManager, enabled: !isActive)
+    }
+    
+    static func setNightMode(_ prefs: Prefs, tabManager: TabManager, enabled: Bool) {
+        prefs.setBool(enabled, forKey: NightModePrefsKey.NightModeStatus)
+        for tab in tabManager.tabs {
+            tab.setNightMode(enabled)
+        }
+    }
+
+    static func isActivated(_ prefs: Prefs) -> Bool {
+        return prefs.boolForKey(NightModePrefsKey.NightModeStatus) ?? false
+    }
+}
+
+class NightModeAccessors {
+    static func isNightMode(_ prefs: Prefs) -> Bool {
+        return prefs.boolForKey(NightModePrefsKey.NightModeStatus) ?? false
+    }
+}