Move Application:: hide_application, hide_others and set_menu to Mac platform extension

druid-shell/src/application.rs

@@ -170,28 +170,6 @@ impl Application {
         self.backend_app.quit()
     }
 
-    // TODO: do these three go in some kind of PlatformExt trait?
-    /// Hide the application this window belongs to. (cmd+H)
-    pub fn hide(&self) {
-        #[cfg(target_os = "macos")]
-        self.backend_app.hide()
-    }
-
-    /// Hide all other applications. (cmd+opt+H)
-    pub fn hide_others(&self) {
-        #[cfg(target_os = "macos")]
-        self.backend_app.hide_others()
-    }
-
-    /// Sets the global application menu, on platforms where there is one.
-    ///
-    /// On platforms with no global application menu, this has no effect.
-    #[allow(unused_variables)]
-    pub fn set_menu(&self, menu: crate::Menu) {
-        #[cfg(target_os = "macos")]
-        self.backend_app.set_menu(menu.into_inner());
-    }
-
     /// Returns a handle to the system clipboard.
     pub fn clipboard(&self) -> Clipboard {
         self.backend_app.clipboard().into()

druid-shell/src/backend/mac/application.rs

@@ -32,7 +32,6 @@ use crate::application::AppHandler;
 
 use super::clipboard::Clipboard;
 use super::error::Error;
-use super::menu::Menu;
 use super::util;
 
 static APP_HANDLER_IVAR: &str = "druidAppHandler";
@@ -102,28 +101,6 @@ impl Application {
         }
     }
 
-    /// Hide the application this window belongs to. (cmd+H)
-    pub fn hide(&self) {
-        unsafe {
-            let () = msg_send![self.ns_app, hide: nil];
-        }
-    }
-
-    /// Hide all other applications. (cmd+opt+H)
-    pub fn hide_others(&self) {
-        unsafe {
-            let workspace = class!(NSWorkspace);
-            let shared: id = msg_send![workspace, sharedWorkspace];
-            let () = msg_send![shared, hideOtherApplications];
-        }
-    }
-
-    pub fn set_menu(&self, menu: Menu) {
-        unsafe {
-            NSApp().setMainMenu_(menu.menu);
-        }
-    }
-
     pub fn clipboard(&self) -> Clipboard {
         Clipboard
     }
@@ -142,6 +119,28 @@ impl Application {
     }
 }
 
+impl crate::platform::mac::MacApplicationExt for crate::Application {
+    fn hide(&self) {
+        unsafe {
+            let () = msg_send![self.backend_app.ns_app, hide: nil];
+        }
+    }
+
+    fn hide_others(&self) {
+        unsafe {
+            let workspace = class!(NSWorkspace);
+            let shared: id = msg_send![workspace, sharedWorkspace];
+            let () = msg_send![shared, hideOtherApplications];
+        }
+    }
+
+    fn set_menu(&self, menu: crate::Menu) {
+        unsafe {
+            NSApp().setMainMenu_(menu.0.menu);
+        }
+    }
+}
+
 struct DelegateState {
     handler: Option<Box<dyn AppHandler>>,
 }

druid-shell/src/menu.rs

@@ -25,7 +25,7 @@ use crate::hotkey::HotKey;
 /// Currently, a menu and its items cannot be changed once created. If you need
 /// to change anything about a menu (for instance, disabling or selecting items)
 /// you need to create a new menu with the desired properties.
-pub struct Menu(backend::Menu);
+pub struct Menu(pub(crate) backend::Menu);
 
 impl Menu {
     /// Create a new empty window or application menu.

druid-shell/src/platform/mac.rs

@@ -0,0 +1,40 @@
+// Copyright 2021 The Druid Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! macOS specific extensions.
+
+/// macOS specific extensions to [`Application`]
+///
+/// [`Application`]: crate::Application
+pub trait MacApplicationExt {
+    /// Hide the application this window belongs to. (cmd+H)
+    fn hide(&self);
+
+    /// Hide all other applications. (cmd+opt+H)
+    fn hide_others(&self);
+
+    /// Sets the global application menu, on platforms where there is one.
+    ///
+    /// On platforms with no global application menu, this has no effect.
+    fn set_menu(&self, menu: crate::Menu);
+}
+
+#[cfg(test)]
+mod test {
+    use crate::Application;
+
+    use super::*;
+    use static_assertions as sa;
+    sa::assert_impl_all!(Application: MacApplicationExt);
+}

druid-shell/src/platform/mod.rs

@@ -16,3 +16,6 @@
 
 #[cfg(any(doc, target_os = "linux"))]
 pub mod linux;
+
+#[cfg(any(doc, target_os = "macos"))]
+pub mod mac;

druid/src/command.rs

@@ -183,10 +183,18 @@ pub mod sys {
     /// Quit the running application. This command is handled by the druid library.
     pub const QUIT_APP: Selector = Selector::new("druid-builtin.quit-app");
 
-    /// Hide the application. (mac only?)
+    /// Hide the application. (mac only)
+    #[cfg_attr(
+        not(target_os = "macos"),
+        deprecated = "HIDE_APPLICATION is only supported on macOS"
+    )]
     pub const HIDE_APPLICATION: Selector = Selector::new("druid-builtin.menu-hide-application");
 
-    /// Hide all other applications. (mac only?)
+    /// Hide all other applications. (mac only)
+    #[cfg_attr(
+        not(target_os = "macos"),
+        deprecated = "HIDE_OTHERS is only supported on macOS"
+    )]
     pub const HIDE_OTHERS: Selector = Selector::new("druid-builtin.menu-hide-others");
 
     /// The selector for a command to create a new window.

druid/src/win_handler.rs

@@ -474,6 +474,8 @@ impl<T: Data> Inner<T> {
 
         #[cfg(target_os = "macos")]
         {
+            use druid_shell::platform::mac::MacApplicationExt;
+
             let windows = &mut self.windows;
             let window = self.menu_window.and_then(|w| windows.get_mut(w));
             if let Some(window) = window {
@@ -652,7 +654,9 @@ impl<T: Data> AppState<T> {
         match cmd.target() {
             // these are handled the same no matter where they come from
             _ if cmd.is(sys_cmd::QUIT_APP) => self.quit(),
+            #[cfg(target_os = "macos")]
             _ if cmd.is(sys_cmd::HIDE_APPLICATION) => self.hide_app(),
+            #[cfg(target_os = "macos")]
             _ if cmd.is(sys_cmd::HIDE_OTHERS) => self.hide_others(),
             _ if cmd.is(sys_cmd::NEW_WINDOW) => {
                 if let Err(e) = self.new_window(cmd) {
@@ -835,14 +839,16 @@ impl<T: Data> AppState<T> {
         self.inner.borrow().app.quit()
     }
 
+    #[cfg(target_os = "macos")]
     fn hide_app(&self) {
-        #[cfg(target_os = "macos")]
+        use druid_shell::platform::mac::MacApplicationExt;
         self.inner.borrow().app.hide()
     }
 
+    #[cfg(target_os = "macos")]
     fn hide_others(&mut self) {
-        #[cfg(target_os = "macos")]
-        self.inner.borrow().app.hide_others()
+        use druid_shell::platform::mac::MacApplicationExt;
+        self.inner.borrow().app.hide_others();
     }
 
     pub(crate) fn build_native_window(