project init

.gitignore

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+deno.lock
+gtk-test

deno.json

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+{
+  "tasks": {
+    "dev": "deno run --watch  --allow-all  main.ts"
+  },
+  "imports": {
+    "@sigmasd/gtk": "jsr:@sigmasd/gtk@^0.60.0"
+  }
+}

main.ts

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+import {
+  Application,
+  ApplicationFlags,
+  ApplicationWindow,
+  Box,
+  Button,
+  Label,
+  Orientation,
+} from "@sigmasd/gtk/gtk4";
+
+const app = new Application("com.example.HelloWorld", ApplicationFlags.NONE);
+
+app.onActivate(() => {
+  const win = new ApplicationWindow(app);
+  win.setTitle("Hello World");
+  win.setDefaultSize(400, 300);
+
+  const box = new Box(Orientation.VERTICAL, 12);
+  box.setMarginTop(24);
+  box.setMarginBottom(24);
+  box.setMarginStart(24);
+  box.setMarginEnd(24);
+
+  const label = new Label("Hello, GTK! 👋");
+  box.append(label);
+
+  const button = new Button("Click Me!");
+  button.onClick(() => {
+    label.setText("Button clicked! 🎉");
+  });
+  box.append(button);
+
+  win.setChild(box);
+  win.present();
+});
+
+app.run([]);