Added an option to make the expand icon transparent (stealth mode)

hidden/AppDelegate.swift

@@ -50,7 +50,8 @@ class AppDelegate: NSObject, NSApplicationDelegate{
             UserDefaults.Key.isAutoHide: true,
             UserDefaults.Key.numberOfSecondForAutoHide: 10.0,
             UserDefaults.Key.areSeparatorsHidden: false,
-            UserDefaults.Key.alwaysHiddenSectionEnabled: false
+            UserDefaults.Key.alwaysHiddenSectionEnabled: false,
+            UserDefaults.Key.useTransparentExpandIconEnabled: false
          ])
     }
 

hidden/Assets.xcassets/ic_expand_hidden.imageset/Contents.json

@@ -0,0 +1,24 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "ic_expand_hidden.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "template"
+  }
+}

hidden/Common/Assets.swift

@@ -9,18 +9,21 @@
 import AppKit
 
 struct Assets {
+    private static var expandIcon: String { Preferences.useTransparentExpandIconEnabled ? "ic_expand_hidden" : "ic_expand" }
+    private static var collapseIcon: String { "ic_collapse" }
+
     static var expandImage: NSImage? {
         if (Constant.isUsingLTRLanguage) {
-            return NSImage(named: NSImage.Name("ic_expand"))
+            return NSImage(named: NSImage.Name(expandIcon))
         } else {
-            return NSImage(named: NSImage.Name("ic_collapse"))
+            return NSImage(named: NSImage.Name(collapseIcon))
         }
     }
     static var collapseImage: NSImage? {
         if (Constant.isUsingLTRLanguage) {
-            return NSImage(named: NSImage.Name("ic_collapse"))
+            return NSImage(named: NSImage.Name(collapseIcon))
         } else {
-            return NSImage(named: NSImage.Name("ic_expand"))
+            return NSImage(named: NSImage.Name(expandIcon))
         }
     }
 }

hidden/Common/Preferences.swift

@@ -105,5 +105,16 @@ enum Preferences {
         }
     }
 
+    static var useTransparentExpandIconEnabled: Bool {
+        get {
+            UserDefaults.standard.bool(forKey: UserDefaults.Key.useTransparentExpandIconEnabled)
+        }
+
+        set {
+            UserDefaults.standard.set(newValue, forKey: UserDefaults.Key.useTransparentExpandIconEnabled)
+            NotificationCenter.default.post(Notification(name: .transparentExpandIconToggle))
+        }
+    }
+
 
 }

hidden/Extensions/Notification.Name+Extension.swift

@@ -12,4 +12,5 @@ extension Notification.Name {
 
     static let prefsChanged = Notification.Name("prefsChanged")
     static let alwayHideToggle = Notification.Name("alwayHideToggle")
+    static let transparentExpandIconToggle = Notification.Name("transparentExpandToggle")
 }

hidden/Extensions/UserDefault+Extension.swift

@@ -18,6 +18,7 @@ extension UserDefaults {
         static let areSeparatorsHidden = "areSeparatorsHidden"
         static let alwaysHiddenSectionEnabled = "alwaysHiddenSectionEnabled"
         static let useFullStatusBarOnExpandEnabled = "useFullStatusBarOnExpandEnabled"
+        static let useTransparentExpandIconEnabled = "useTransparentExpandIconEnabled"
     }
 
     open override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {

hidden/Features/Preferences/PreferencesViewController.swift

@@ -29,6 +29,7 @@ class PreferencesViewController: NSViewController {
     @IBOutlet weak var checkBoxKeepInDock: NSButton!
     @IBOutlet weak var checkBoxLogin: NSButton!
     @IBOutlet weak var checkBoxShowPreferences: NSButton!
+    @IBOutlet weak var checkBoxTransparentExpandIcon: NSButton!
     @IBOutlet weak var checkBoxShowAlwaysHiddenSection: NSButton!
 
     @IBOutlet weak var checkBoxUseFullStatusbar: NSButton!
@@ -83,6 +84,10 @@ class PreferencesViewController: NSViewController {
         Preferences.useFullStatusBarOnExpandEnabled = sender.state == .on
     }
 
+    @IBAction func useTransparentExpandIconChanged(_ sender: NSButton) {
+        Preferences.useTransparentExpandIconEnabled = sender.state == .on
+    }
+
 
     @IBAction func timePopupDidSelected(_ sender: NSPopUpButton) {
         let selectedIndex = sender.indexOfSelectedItem
@@ -155,6 +160,7 @@ class PreferencesViewController: NSViewController {
         checkBoxLogin.state = Preferences.isAutoStart ? .on : .off
         checkBoxAutoHide.state = Preferences.isAutoHide ? .on : .off
         checkBoxShowPreferences.state = Preferences.isShowPreference ? .on : .off
+        checkBoxTransparentExpandIcon.state = Preferences.useTransparentExpandIconEnabled ? .on : .off
         checkBoxShowAlwaysHiddenSection.state = Preferences.alwaysHiddenSectionEnabled ? .on : .off
         timePopup.selectItem(at: SelectedSecond.secondToPossition(seconds: Preferences.numberOfSecondForAutoHide))
     }

hidden/Features/StatusBar/StatusBarController.swift

@@ -66,6 +66,7 @@ class StatusBarController {
 
         setupUI()
         setupAlwayHideStatusBar()
+        setupTransparentExpandIcon()
         DispatchQueue.main.asyncAfter(deadline: .now() + 1, execute: {
             self.collapseMenuBar()
         })
@@ -254,4 +255,14 @@ extension StatusBarController {
             self.btnAlwaysHidden = nil
         }
     }
+
+    private func setupTransparentExpandIcon() {
+        NotificationCenter.default.addObserver(self, selector: #selector(toggleTransparentExpandIconIfNeeded), name: .transparentExpandIconToggle, object: nil)
+    }
+    @objc private func toggleTransparentExpandIconIfNeeded() {
+        guard self.isCollapsed else { return }
+        if let button = btnExpandCollapse.button {
+            button.image = Assets.expandImage
+        }
+    }
 }