Add init_for_nsapp

README.md

@@ -20,6 +20,8 @@ let cut_item = file_menu.add_text_item("Cut", true);
 menu.init_for_hwnd(window.hwnd() as isize);
 #[cfg(target_os = "linux")]
 menu.init_for_gtk_window(&gtk_window);
+#[cfg(target_os = "macos")]
+menu.init_for_nsapp();
 ```
 Then listen for the events
 ```rs

examples/tao.rs

@@ -38,6 +38,11 @@ fn main() {
         menu_bar.init_for_gtk_window(window2.gtk_window());
     }
 
+    #[cfg(target_os = "macos")]
+    {
+        menu_bar.init_for_nsapp();
+    }
+
     let menu_channel = menu_event_receiver();
     let mut open_item_disabled = false;
     let mut counter = 0;

examples/winit.rs

@@ -31,6 +31,11 @@ fn main() {
         menu_bar.init_for_hwnd(_window2.hwnd() as _);
     }
 
+    #[cfg(target_os = "macos")]
+    {
+        menu_bar.init_for_nsapp();
+    }
+
     let menu_channel = menu_event_receiver();
     let mut open_item_disabled = false;
     let mut counter = 0;

src/lib.rs

@@ -40,6 +40,8 @@
 //! menu.init_for_hwnd(window.hwnd() as isize);
 //! #[cfg(target_os = "linux")]
 //! menu.init_for_gtk_window(&gtk_window);
+//! #[cfg(target_os = "macos")]
+//! menu.init_for_nsapp();
 //! ```
 //!
 //! # Processing menu events
@@ -118,6 +120,12 @@ impl Menu {
     pub fn init_for_hwnd(&self, hwnd: isize) {
         self.0.init_for_hwnd(hwnd)
     }
+
+    /// Adds this menu to NSApp.
+    #[cfg(target_os = "macos")]
+    pub fn init_for_nsapp(&self) {
+        self.0.init_for_nsapp()
+    }
 }
 
 #[derive(Clone)]

src/platform_impl/macos/mod.rs

@@ -23,10 +23,23 @@ impl Menu {
 
     pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
         let mut sub_menu = Submenu(Menu::new());
-        sub_menu.set_label(label);
+        sub_menu.set_label(label.as_ref());
         sub_menu.set_enabled(enabled);
+        let item = TextMenuItem::new(label, enabled, sel!(fireMenubarAction:));
+
+        unsafe {
+            item.ns_menu_item.setSubmenu_(sub_menu.0 .0);
+            self.0.addItem_(item.ns_menu_item);
+        }
+
         sub_menu
     }
+
+    pub fn init_for_nsapp(&self) {
+        unsafe {
+            NSApp().setMainMenu_(self.0);
+        }
+    }
 }
 
 #[derive(Debug, Clone)]