Document Controls: adds dark mode button

App/Document Controls UI/DocumentControlViewController.swift

@@ -15,13 +15,14 @@ class DocumentControlViewController: UIViewController
     let navigationControlView = NavigationControlsView()
     let settingsView = DocumentControlView()
     let readabilityView = DocumentControlView()
+    let darkModeView = DocumentControlView()
     
     var observations: [NSKeyValueObservation] = []
     
     static public let preferredWidth = CGFloat(200.0)
     
-    convenience init() {
-        self.init(nibName: nil, bundle: nil)
+    init(darkModeEnabled: Bool) {
+        super.init(nibName: nil, bundle: nil)
         
         findOnPageControlView.label.text = "Find On Page"
         findOnPageControlView.imageView.image = UIImage(systemName: "magnifyingglass")
@@ -32,10 +33,20 @@ class DocumentControlViewController: UIViewController
         readabilityView.label.text = "Reader Mode"
         readabilityView.imageView.image = UIImage(systemName: "doc.richtext")
         
+        if darkModeEnabled {
+            darkModeView.label.text = "Disable Dark Mode"
+        } else {
+            darkModeView.label.text = "Enable Dark Mode"
+        }
+        
+        darkModeView.imageView.image = DarkModeControls.buttonImage(forDarkModeState: darkModeEnabled)
+        
         documentControlView.addArrangedSubview(navigationControlView)
         documentControlView.addArrangedSubview(fontSizeAdjustView)
         documentControlView.addArrangedSubview(findOnPageControlView)
+        documentControlView.addArrangedSubview(darkModeView)
         documentControlView.addArrangedSubview(readabilityView)
+        
         documentControlView.addArrangedSubview(settingsView)
         
         for (i, view) in documentControlView.arrangedSubviews.enumerated() {
@@ -43,6 +54,10 @@ class DocumentControlViewController: UIViewController
         }
     }
     
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
     override func loadView() {
         self.view = documentControlView
     }