Add MacOS menu (#1583)

* feat: added MacOS menu

* fix: ran fmt

* extracted function into variable

* idiomatic formatting

* Set the default menu only during app startup

* Don't set the activation policy in the menu init

Co-authored-by: Artur Kovacs <kovacs.artur.barnabas@gmail.com>

CHANGELOG.md

@@ -24,6 +24,7 @@
 - On Windows, added `WindowExtWindows::set_enable` to allow creating modal popup windows.
 - On macOS, emit `RedrawRequested` events immediately while the window is being resized.
 - Implement `Default`, `Hash`, and `Eq` for `LogicalPosition`, `PhysicalPosition`, `LogicalSize`, and `PhysicalSize`.
+- On macOS, initialize the Menu Bar with minimal defaults.
 
 # 0.24.0 (2020-12-09)
 

src/platform_impl/macos/app_state.rs

@@ -25,6 +25,7 @@ use crate::{
     platform_impl::platform::{
         event::{EventProxy, EventWrapper},
         event_loop::{post_dummy_event, PanicInfo},
+        menu,
         observer::{CFRunLoopGetMain, CFRunLoopWakeUp, EventLoopWaker},
         util::{IdRef, Never},
         window::get_window_id,
@@ -274,6 +275,9 @@ impl AppState {
     pub fn launched() {
         HANDLER.set_ready();
         HANDLER.waker().start();
+        // The menubar initialization should be before the `NewEvents` event, to allow overriding
+        // of the default menu in the event
+        menu::initialize();
         HANDLER.set_in_callback(true);
         HANDLER.handle_nonuser_event(EventWrapper::StaticEvent(Event::NewEvents(
             StartCause::Init,

src/platform_impl/macos/menu.rs

@@ -0,0 +1,117 @@
+use cocoa::appkit::{
+    NSApp, NSApplication, NSApplicationActivationPolicyRegular, NSEventModifierFlags, NSMenu,
+    NSMenuItem,
+};
+use cocoa::base::{nil, selector};
+use cocoa::foundation::{NSAutoreleasePool, NSProcessInfo, NSString};
+use objc::{
+    rc::autoreleasepool,
+    runtime::{Object, Sel},
+};
+
+struct KeyEquivalent<'a> {
+    key: &'a str,
+    masks: Option<NSEventModifierFlags>,
+}
+
+pub fn initialize() {
+    autoreleasepool(|| unsafe {
+        let menubar = NSMenu::new(nil).autorelease();
+        let app_menu_item = NSMenuItem::new(nil).autorelease();
+        menubar.addItem_(app_menu_item);
+        let app = NSApp();
+        app.setMainMenu_(menubar);
+
+        let app_menu = NSMenu::new(nil);
+        let process_name = NSProcessInfo::processInfo(nil).processName();
+
+        // About menu item
+        let about_item_prefix = NSString::alloc(nil).init_str("About ");
+        let about_item_title = about_item_prefix.stringByAppendingString_(process_name);
+        let about_item = menu_item(
+            about_item_title,
+            selector("orderFrontStandardAboutPanel:"),
+            None,
+        );
+
+        // Seperator menu item
+        let sep_first = NSMenuItem::separatorItem(nil);
+
+        // Hide application menu item
+        let hide_item_prefix = NSString::alloc(nil).init_str("Hide ");
+        let hide_item_title = hide_item_prefix.stringByAppendingString_(process_name);
+        let hide_item = menu_item(
+            hide_item_title,
+            selector("hide:"),
+            Some(KeyEquivalent {
+                key: "h",
+                masks: None,
+            }),
+        );
+
+        // Hide other applications menu item
+        let hide_others_item_title = NSString::alloc(nil).init_str("Hide Others");
+        let hide_others_item = menu_item(
+            hide_others_item_title,
+            selector("hideOtherApplications:"),
+            Some(KeyEquivalent {
+                key: "h",
+                masks: Some(
+                    NSEventModifierFlags::NSAlternateKeyMask
+                        | NSEventModifierFlags::NSCommandKeyMask,
+                ),
+            }),
+        );
+
+        // Show applications menu item
+        let show_all_item_title = NSString::alloc(nil).init_str("Show All");
+        let show_all_item = menu_item(
+            show_all_item_title,
+            selector("unhideAllApplications:"),
+            None,
+        );
+
+        // Seperator menu item
+        let sep = NSMenuItem::separatorItem(nil);
+
+        // Quit application menu item
+        let quit_item_prefix = NSString::alloc(nil).init_str("Quit ");
+        let quit_item_title = quit_item_prefix.stringByAppendingString_(process_name);
+        let quit_item = menu_item(
+            quit_item_title,
+            selector("terminate:"),
+            Some(KeyEquivalent {
+                key: "q",
+                masks: None,
+            }),
+        );
+
+        app_menu.addItem_(about_item);
+        app_menu.addItem_(sep_first);
+        app_menu.addItem_(hide_item);
+        app_menu.addItem_(hide_others_item);
+        app_menu.addItem_(show_all_item);
+        app_menu.addItem_(sep);
+        app_menu.addItem_(quit_item);
+        app_menu_item.setSubmenu_(app_menu);
+    });
+}
+
+fn menu_item(
+    title: *mut Object,
+    selector: Sel,
+    key_equivalent: Option<KeyEquivalent<'_>>,
+) -> *mut Object {
+    unsafe {
+        let (key, masks) = match key_equivalent {
+            Some(ke) => (NSString::alloc(nil).init_str(ke.key), ke.masks),
+            None => (NSString::alloc(nil).init_str(""), None),
+        };
+        let item = NSMenuItem::alloc(nil).initWithTitle_action_keyEquivalent_(title, selector, key);
+        if let Some(masks) = masks {
+            item.setKeyEquivalentModifierMask_(masks)
+        }
+
+        item
+    }
+}

src/platform_impl/macos/mod.rs

@@ -7,6 +7,7 @@ mod app_state;
 mod event;
 mod event_loop;
 mod ffi;
+mod menu;
 mod monitor;
 mod observer;
 mod util;