examples/api/lib/material/input_decorator/input_decoration.material_state.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.

/// Flutter code sample for [InputDecoration].

import 'package:flutter/material.dart';

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

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

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatelessWidget(),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return TextFormField(
      initialValue: 'abc',
      decoration: InputDecoration(
        prefixIcon: const Icon(Icons.person),
        prefixIconColor: MaterialStateColor.resolveWith((Set<MaterialState> states) {
          if (states.contains(MaterialState.focused)) {
            return Colors.green;
          } if (states.contains(MaterialState.error)) {
            return Colors.red;
          }
          return Colors.grey;
        }),
      ),
    );
  }
}