Move AppKit (macOS) backend to winit-appkit (#4248)

winit-appkit/src/menu.rs

@@ -0,0 +1,104 @@
+use objc2::rc::Retained;
+use objc2::runtime::Sel;
+use objc2::{sel, MainThreadMarker};
+use objc2_app_kit::{NSApplication, NSEventModifierFlags, NSMenu, NSMenuItem};
+use objc2_foundation::{ns_string, NSProcessInfo, NSString};
+
+struct KeyEquivalent<'a> {
+    key: &'a NSString,
+    masks: Option<NSEventModifierFlags>,
+}
+
+pub fn initialize(app: &NSApplication) {
+    let mtm = MainThreadMarker::from(app);
+    let menubar = NSMenu::new(mtm);
+    let app_menu_item = NSMenuItem::new(mtm);
+    menubar.addItem(&app_menu_item);
+
+    let app_menu = NSMenu::new(mtm);
+    let process_name = NSProcessInfo::processInfo().processName();
+
+    // About menu item
+    let about_item_title = ns_string!("About ").stringByAppendingString(&process_name);
+    let about_item =
+        menu_item(mtm, &about_item_title, Some(sel!(orderFrontStandardAboutPanel:)), None);
+
+    // Services menu item
+    let services_menu = NSMenu::new(mtm);
+    let services_item = menu_item(mtm, ns_string!("Services"), None, None);
+    services_item.setSubmenu(Some(&services_menu));
+
+    // Separator menu item
+    let sep_first = NSMenuItem::separatorItem(mtm);
+
+    // Hide application menu item
+    let hide_item_title = ns_string!("Hide ").stringByAppendingString(&process_name);
+    let hide_item = menu_item(
+        mtm,
+        &hide_item_title,
+        Some(sel!(hide:)),
+        Some(KeyEquivalent { key: ns_string!("h"), masks: None }),
+    );
+
+    // Hide other applications menu item
+    let hide_others_item_title = ns_string!("Hide Others");
+    let hide_others_item = menu_item(
+        mtm,
+        hide_others_item_title,
+        Some(sel!(hideOtherApplications:)),
+        Some(KeyEquivalent {
+            key: ns_string!("h"),
+            masks: Some(NSEventModifierFlags::Option | NSEventModifierFlags::Command),
+        }),
+    );
+
+    // Show applications menu item
+    let show_all_item_title = ns_string!("Show All");
+    let show_all_item =
+        menu_item(mtm, show_all_item_title, Some(sel!(unhideAllApplications:)), None);
+
+    // Separator menu item
+    let sep = NSMenuItem::separatorItem(mtm);
+
+    // Quit application menu item
+    let quit_item_title = ns_string!("Quit ").stringByAppendingString(&process_name);
+    let quit_item = menu_item(
+        mtm,
+        &quit_item_title,
+        Some(sel!(terminate:)),
+        Some(KeyEquivalent { key: ns_string!("q"), masks: None }),
+    );
+
+    app_menu.addItem(&about_item);
+    app_menu.addItem(&sep_first);
+    app_menu.addItem(&services_item);
+    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(Some(&app_menu));
+
+    unsafe { app.setServicesMenu(Some(&services_menu)) };
+    app.setMainMenu(Some(&menubar));
+}
+
+fn menu_item(
+    mtm: MainThreadMarker,
+    title: &NSString,
+    selector: Option<Sel>,
+    key_equivalent: Option<KeyEquivalent<'_>>,
+) -> Retained<NSMenuItem> {
+    let (key, masks) = match key_equivalent {
+        Some(ke) => (ke.key, ke.masks),
+        None => (ns_string!(""), None),
+    };
+    let item = unsafe {
+        NSMenuItem::initWithTitle_action_keyEquivalent(mtm.alloc(), title, selector, key)
+    };
+    if let Some(masks) = masks {
+        item.setKeyEquivalentModifierMask(masks)
+    }
+
+    item
+}