flutter_flutter/examples/api/lib/widgets/autocomplete/raw_autocomplete.0.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';

/// Flutter code sample for [RawAutocomplete].

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('RawAutocomplete Basic')),
        body: const Center(child: AutocompleteBasicExample()),
      ),
    );
  }
}

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

  static const List<String> _options = <String>['aardvark', 'bobcat', 'chameleon'];

  @override
  Widget build(BuildContext context) {
    return RawAutocomplete<String>(
      optionsBuilder: (TextEditingValue textEditingValue) {
        return _options.where((String option) {
          return option.contains(textEditingValue.text.toLowerCase());
        });
      },
      fieldViewBuilder:
          (
            BuildContext context,
            TextEditingController textEditingController,
            FocusNode focusNode,
            VoidCallback onFieldSubmitted,
          ) {
            return TextFormField(
              controller: textEditingController,
              focusNode: focusNode,
              onFieldSubmitted: (String value) {
                onFieldSubmitted();
              },
            );
          },
      optionsViewBuilder:
          (
            BuildContext context,
            AutocompleteOnSelected<String> onSelected,
            Iterable<String> options,
          ) {
            return Align(
              alignment: Alignment.topLeft,
              child: Material(
                elevation: 4.0,
                child: SizedBox(
                  height: 200.0,
                  child: ListView.builder(
                    padding: const EdgeInsets.all(8.0),
                    itemCount: options.length,
                    itemBuilder: (BuildContext context, int index) {
                      final String option = options.elementAt(index);
                      return GestureDetector(
                        onTap: () {
                          onSelected(option);
                        },
                        child: ListTile(title: Text(option)),
                      );
                    },
                  ),
                ),
              ),
            );
          },
    );
  }
}