scaffold: Cargo.toml, module stubs, layer-shell window (step 1+2)

src/main.rs

@@ -0,0 +1,47 @@
+mod bar;
+mod notifications;
+mod theme;
+
+use gtk4::prelude::*;
+use gtk4_layer_shell::{Edge, Layer, LayerShell};
+use relm4::prelude::*;
+
+struct App;
+
+#[relm4::component]
+impl SimpleComponent for App {
+    type Init = ();
+    type Input = ();
+    type Output = ();
+
+    view! {
+        gtk::ApplicationWindow {
+            set_title: Some("aster"),
+            set_default_height: 32,
+        }
+    }
+
+    fn init(
+        _: Self::Init,
+        root: Self::Root,
+        _sender: ComponentSender<Self>,
+    ) -> ComponentParts<Self> {
+        root.init_layer_shell();
+        root.set_layer(Layer::Top);
+        root.set_anchor(Edge::Top, true);
+        root.set_anchor(Edge::Left, true);
+        root.set_anchor(Edge::Right, true);
+        root.set_exclusive_zone(32);
+
+        let model = App;
+        let widgets = view_output!();
+        ComponentParts { model, widgets }
+    }
+
+    fn update(&mut self, _: Self::Input, _: ComponentSender<Self>) {}
+}
+
+fn main() {
+    let app = RelmApp::new("sh.breadway.aster");
+    app.run::<App>(());
+}