Changed to activate before opening window on macos.

src/platform_impl/macos/app_delegate.rs

@@ -39,6 +39,11 @@ lazy_static! {
     decl.add_class_method(sel!(new), new as extern "C" fn(&Class, Sel) -> id);
     decl.add_method(sel!(dealloc), dealloc as extern "C" fn(&Object, Sel));
 
+    decl.add_method(
+      sel!(applicationWillFinishLaunching:),
+      will_finish_launching as extern "C" fn(&Object, Sel, id),
+    );
+
     decl.add_method(
       sel!(applicationDidFinishLaunching:),
       did_finish_launching as extern "C" fn(&Object, Sel, id),
@@ -85,6 +90,12 @@ extern "C" fn dealloc(this: &Object, _: Sel) {
   }
 }
 
+extern "C" fn will_finish_launching(this: &Object, _: Sel, _: id) {
+  trace!("Triggered `applicationWillFinishLaunching`");
+  AppState::will_launch(this);
+  trace!("Completed `applicationWillFinishLaunching`");
+}
+
 extern "C" fn did_finish_launching(this: &Object, _: Sel, _: id) {
   trace!("Triggered `applicationDidFinishLaunching`");
   AppState::launched(this);

src/platform_impl/macos/app_state.rs

@@ -281,7 +281,16 @@ impl AppState {
     }
   }
 
+  pub fn will_launch(app_delegate: &Object) {
+    apply_activation_policy(app_delegate);
+  }
+
   pub fn launched(app_delegate: &Object) {
+    // In catalina, if we set the activation policy before the app is launched,
+    // We get a bug where the menu is not clickable.
+    // We have solved this problem by setting the activation policy to prohibited
+    // with `set_policy_to_prohibited` and then running `apply_activation_policy` again.
+    set_policy_to_prohibited();
     apply_activation_policy(app_delegate);
     unsafe {
       let ns_app = NSApp();
@@ -443,9 +452,6 @@ fn apply_activation_policy(app_delegate: &Object) {
   unsafe {
     use cocoa::appkit::NSApplicationActivationPolicy::*;
     let ns_app = NSApp();
-    // We need to delay setting the activation policy and activating the app
-    // until `applicationDidFinishLaunching` has been called. Otherwise the
-    // menu bar won't be interactable.
     let act_pol = get_aux_state_mut(app_delegate).activation_policy;
     ns_app.setActivationPolicy_(match act_pol {
       ActivationPolicy::Regular => NSApplicationActivationPolicyRegular,
@@ -454,3 +460,10 @@ fn apply_activation_policy(app_delegate: &Object) {
     });
   }
 }
+
+fn set_policy_to_prohibited() {
+  unsafe {
+    let ns_app = NSApp();
+    ns_app.setActivationPolicy_(cocoa::appkit::NSApplicationActivationPolicyProhibited);
+  }
+}