Aileonzlc · January 23, 2024 04:10 · Jan 5, 2018
diff --git a/MenuBarOptionKeyListener.swift b/MenuBarOptionKeyListener.swift
@@ -0,0 +1,47 @@
+class AppDeleatate: NSObject, NSApplicationDelegate {
+  fileprivate var optionalMenuItems = [NSMenuItem]()
+  //...
+
+  func applicationDidFinishLaunching(_ aNotification: Notification) {
+        //...
+        let specialItem = NSMenuItem(title: MenuBarItemLabelText.specialItem, action: #selector(doNeatAction), keyEquivalent: "")
+        specialItem.isHidden = true
+
+        optionalMenuItems.append(specialItem)
+        //...
+  }
+}
+
+//MARK: NSMenuDelegate + Option key shows additional menu items
+extension AppDelegate: NSMenuDelegate {
+
+    func menuWillOpen(_ menu: NSMenu) {
+        if menuObserver == nil {
+            menuObserver = CFRunLoopObserverCreateWithHandler(nil, CFRunLoopActivity.beforeWaiting.rawValue, true, 0, { (observer, activity) in
+                self.menuRecievedEvents()
+            })
+
+            CFRunLoopAddObserver(CFRunLoopGetCurrent(), menuObserver, CFRunLoopMode.commonModes)
+        }
+    }
+
+    func menuDidClose(_ menu: NSMenu) {
+        guard menuObserver != nil else {
+            return
+        }
+        CFRunLoopObserverInvalidate(menuObserver)
+        menuObserver = nil
+    }
+
+    /// Will update the active menu. Used to update for events such as `OPTION` key presses.
+    fileprivate func menuRecievedEvents() {
+        // Get global modifier key flags
+        let event = CGEvent(source: nil)
+        let flags: CGEventFlags = event!.flags
+        let optionKeyIsPressed = CGEventFlags(rawValue: flags.rawValue & CGEventFlags.maskAlternate.rawValue) == CGEventFlags.maskAlternate
+
+        for item in optionalMenuItems {
+            item.isHidden = !optionKeyIsPressed
+        }
+    }
+}