Simplify new navigator window

src/dialogs/preferences.rs

@@ -59,10 +59,8 @@ impl Preferences {
                         if let Some(path) = file.get_path() {
                             this.music_library_path_row.set_subtitle(Some(path.to_str().unwrap()));
 
-                            let context = glib::MainContext::default();
-                            let backend = this.backend.clone();
-                            context.spawn_local(async move {
-                                backend.set_music_library_path(path).await.unwrap();
+                            spawn!(@clone this, async move {
+                                this.backend.set_music_library_path(path).await.unwrap();
                             });
                         }
                     }
@@ -87,13 +85,10 @@ impl Preferences {
         login_button.connect_clicked(clone!(@strong this => move |_| {
             let window = NavigatorWindow::new(this.backend.clone());
             window.set_transient_for(&this.window);
-            window.show();
 
-            let context = glib::MainContext::default();
-            let clone = this.clone();
-            context.spawn_local(async move {
-                if let Some(data) = window.navigator.replace::<_, _, LoginDialog>(()).await {
-                    clone.login_row.set_subtitle(Some(&data.username));
+            spawn!(@clone this, async move {
+                if let Some(data) = replace!(window.navigator, LoginDialog).await {
+                    this.login_row.set_subtitle(Some(&data.username));
                 }
             });
         }));

src/macros.rs

@@ -23,6 +23,31 @@ macro_rules! push {
     };
 }
 
+/// Simplification for replacing the current navigator screen.
+///
+/// This macro can be invoked in two forms.
+///
+/// 1. To replace with screens without an input value:
+///
+/// ```
+/// let result = replace!(navigator, ScreenType).await;
+/// ```
+///
+/// 2. To replace with screens with an input value:
+///
+/// ```
+/// let result = replace!(navigator, ScreenType, input).await;
+/// ```
+#[macro_export]
+macro_rules! replace {
+    ($navigator:expr, $screen:ty) => {
+        $navigator.replace::<_, _, $screen>(())
+    };
+    ($navigator:expr, $screen:ty, $input:ident) => {
+        $navigator.replace::<_, _, $screen>($input)
+    };
+}
+
 /// Spawn a future on the GLib MainContext.
 ///
 /// This can be invoked in the following forms:

src/widgets/new_navigator_window.rs

@@ -11,7 +11,7 @@ pub struct NavigatorWindow {
 }
 
 impl NavigatorWindow {
-    /// Create a new navigator window.
+    /// Create a new navigator window and show it.
     pub fn new(backend: Rc<Backend>) -> Rc<Self> {
         let window = libadwaita::Window::new();
         window.set_default_size(600, 424);
@@ -25,6 +25,8 @@ impl NavigatorWindow {
             this.window.close();
         }));
 
+        this.window.show();
+
         this
     }