Add auto complete. Close #24

lib/utils/debounce.dart

@@ -0,0 +1,28 @@
+import 'dart:async';
+import 'dart:ui';
+
+class Debounce {
+  final Duration delay;
+  VoidCallback? _action;
+  Timer? _timer;
+
+  Debounce({required this.delay});
+
+  void call(VoidCallback action) {
+    _action = action;
+    _timer?.cancel();
+    _timer = Timer(delay, _execute);
+  }
+
+  void _execute() {
+    if (_action != null) {
+      _action!();
+      _action = null;
+    }
+  }
+
+  void cancel() {
+    _timer?.cancel();
+    _action = null;
+  }
+}