import 'package:flutter/material.dart';

void main() => runApp(const AutocompleteExampleApp());

class AutocompleteExampleApp extends StatelessWidget {
  const AutocompleteExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: Center(
          child: AutocompleteExample())));
  }
}

class AutocompleteExample extends StatefulWidget {
  const AutocompleteExample({super.key});

  @override
  AutocompleteExampleState createState() => AutocompleteExampleState();
}

class AutocompleteExampleState extends State<AutocompleteExample> {
  final TextEditingController _textEditingController = TextEditingController();
  final FocusNode _focusNode = FocusNode();
  int index = 0;

  @override
  void initState() {
    super.initState();
    _textEditingController.addListener(() {
      print('called $index');
      index++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return RawAutocomplete<String>(
      textEditingController: _textEditingController,
      focusNode: _focusNode,
      optionsBuilder: (TextEditingValue textEditingValue) => ['aardvark', 'bobcat', 'chameleon'],
      fieldViewBuilder: (BuildContext context, TextEditingController textEditingController, FocusNode focusNode, VoidCallback onFieldSubmitted) => TextField(
        controller: textEditingController,
        focusNode: focusNode),
      optionsViewBuilder: (BuildContext context, AutocompleteOnSelected<String> onSelected, Iterable<String> options) => Align(
        alignment: Alignment.topLeft,
        child: Material(
          child: ListView.builder(
            itemCount: options.length,
            itemBuilder: (BuildContext context, int index) {
              final String option = options.elementAt(index);
              return GestureDetector(
                onTap: () {
                  onSelected(option);
                },
                child: ListTile(
                  title: Text(option)));
            }))));
  }
}