Add fullscreen keyboard listener

lib/ui/common/fullscreen_keyboard_listener.dart

@@ -0,0 +1,39 @@
+import 'package:wonders/common_libs.dart';
+
+class FullScreenKeyboardListener extends StatefulWidget {
+  const FullScreenKeyboardListener({super.key, required this.child, this.onKeyDown, this.onKeyUp});
+  final Widget child;
+  final bool Function(KeyDownEvent event)? onKeyDown;
+  final bool Function(KeyUpEvent event)? onKeyUp;
+
+  @override
+  State<FullScreenKeyboardListener> createState() => _FullScreenKeyboardListenerState();
+}
+
+class _FullScreenKeyboardListenerState extends State<FullScreenKeyboardListener> {
+  @override
+  void initState() {
+    super.initState();
+    ServicesBinding.instance.keyboard.addHandler(_handleKey);
+  }
+
+  @override
+  void dispose() {
+    ServicesBinding.instance.keyboard.removeHandler(_handleKey);
+    super.dispose();
+  }
+
+  bool _handleKey(KeyEvent event) {
+    bool result = false;
+    if (event is KeyDownEvent && widget.onKeyDown != null) {
+      result = widget.onKeyDown!.call(event);
+    }
+    if (event is KeyUpEvent && widget.onKeyUp != null) {
+      result = widget.onKeyUp!.call(event);
+    }
+    return result;
+  }
+
+  @override
+  Widget build(BuildContext context) => widget.child;
+}