Put up the app window

Cargo.lock

@@ -864,6 +864,14 @@ dependencies = [
 [[package]]
 name = "falling-sand"
 version = "0.1.0"
+dependencies = [
+ "cairo-rs",
+ "gio",
+ "glib",
+ "glib-build-tools 0.17.10",
+ "gtk4",
+ "libadwaita",
+]
 
 [[package]]
 name = "fastrand"

falling-sand/Cargo.toml

@@ -6,3 +6,11 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+adw         = { version = "0.5", package = "libadwaita", features = [ "v1_4" ] }
+cairo-rs    = { version = "0.18" }
+gio         = { version = "0.18" }
+glib        = { version = "0.18" }
+gtk         = { version = "0.7", package = "gtk4", features = [ "v4_10" ] }
+
+[build-dependencies]
+glib-build-tools = "0.17"

falling-sand/src/main.rs

@@ -1,3 +1,51 @@
-fn main() {
+use cairo::Context;
-    println!("Hello, world!");
+use glib::Object;
+use gtk::{prelude::*, subclass::prelude::*};
+
+const WIDTH: i32 = 600;
+const HEIGHT: i32 = 600;
+
+#[derive(Debug, Default)]
+pub struct SandPrivate;
+
+#[glib::object_subclass]
+impl ObjectSubclass for SandPrivate {
+    const NAME: &'static str = "Sand";
+    type Type = Sand;
+    type ParentType = gtk::DrawingArea;
+}
+
+impl ObjectImpl for SandPrivate {}
+impl WidgetImpl for SandPrivate {}
+impl DrawingAreaImpl for SandPrivate {}
+
+glib::wrapper! {
+    pub struct Sand(ObjectSubclass<SandPrivate>) @extends gtk::DrawingArea, gtk::Widget;
+}
+
+impl Sand {
+    pub fn new() -> Self {
+        let s: Self = Object::builder().build();
+        s.set_width_request(WIDTH);
+        s.set_height_request(HEIGHT);
+
+        s
+    }
+}
+
+fn main() {
+    let app = gtk::Application::builder()
+        .application_id("com.luminescent-dreams.falling-sand")
+        .build();
+
+    app.connect_activate(move |app| {
+        let window = gtk::ApplicationWindow::new(app);
+        window.present();
+
+        let sand = Sand::new();
+
+        window.set_child(Some(&sand));
+    });
+
+    app.run();
 }