Add shift-click menu

ScrollSwitcher/AppDelegate.swift

@@ -15,7 +15,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
     private var prefPanesSupport: Bundle!
     private var item: NSStatusItem!
     private var observation: NSKeyValueObservation?
-
+    
     func applicationDidFinishLaunching(_ aNotification: Notification) {
         
         // this is where _setSwipeScrollDirection is defined
@@ -24,7 +24,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         
         item = NSStatusBar.system.statusItem(withLength: NSStatusItem.squareLength)
         item.button!.target = self
-        item.button!.action = #selector(toggleScrollDirection)
+        item.button!.action = #selector(menuItemClicked)
         updateIcon()
         
         // update the icon when system prefs changes
@@ -35,9 +35,31 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         item.button!.image = Direction.current.image
     }
     
+    @objc private func menuItemClicked() {
+        if let event = NSApp.currentEvent, event.modifierFlags.contains(.shift) {
+            item.menu = createMenu()
+            item.button!.performClick(nil)
+        } else {
+            toggleScrollDirection()
+        }
+    }
+    
+    private func createMenu() -> NSMenu {
+        let menu = NSMenu()
+        menu.delegate = self
+        let state = Direction.current == .natural ? "On" : "Off"
+        let status = NSMenuItem(title: "Natural Scrolling: \(state)", action: nil, keyEquivalent: "")
+        menu.addItem(status)
+        let verb = Direction.current == .natural ? "Disable" : "Enable"
+        let toggleItem = NSMenuItem(title: "\(verb) Natural Scrolling", action: #selector(toggleScrollDirection), keyEquivalent: "")
+        menu.addItem(toggleItem)
+        menu.addItem(NSMenuItem.separator())
+        menu.addItem(withTitle: "Quit", action: #selector(NSApplication.terminate(_:)), keyEquivalent: "q")
+        return menu
+    }
+    
     @objc private func toggleScrollDirection() {
         setDirection(.current == Direction.natural ? .normal : .natural)
-        updateIcon()
     }
     
     private func setDirection(_ new: Direction) {
@@ -67,6 +89,13 @@ class AppDelegate: NSObject, NSApplicationDelegate {
 
 }
 
+extension AppDelegate: NSMenuDelegate {
+    func menuDidClose(_ menu: NSMenu) {
+        // remove the menu so the next time the item is clicked, it performs the primary action
+        item.menu = nil
+    }
+}
+
 enum Direction: Int, Equatable {
     case normal, natural