preferred_size.0.dart 2.13 KB
Newer Older
1 2 3 4
// 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.

5
// Flutter code sample for [PreferredSize].
6 7 8 9 10 11

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
12
  const MyApp({super.key});
13 14 15 16 17 18 19 20 21 22 23 24 25

  static const String _title = 'Flutter Code Sample';

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

class AppBarContent extends StatelessWidget {
26
  const AppBarContent({super.key});
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.end,
      children: <Widget>[
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 10),
          child: Row(
            children: <Widget>[
              const Text(
                'PreferredSize Sample',
                style: TextStyle(color: Colors.white),
              ),
              const Spacer(),
              IconButton(
                icon: const Icon(
                  Icons.search,
                  size: 20,
                ),
                color: Colors.white,
                onPressed: () {},
              ),
              IconButton(
                icon: const Icon(
                  Icons.more_vert,
                  size: 20,
                ),
                color: Colors.white,
                onPressed: () {},
              ),
            ],
          ),
        ),
      ],
    );
  }
}

class MyStatelessWidget extends StatelessWidget {
67
  const MyStatelessWidget({super.key});
68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: PreferredSize(
        preferredSize: const Size.fromHeight(80.0),
        child: Container(
          decoration: const BoxDecoration(
            gradient: LinearGradient(
              colors: <Color>[Colors.blue, Colors.pink],
            ),
          ),
          child: const AppBarContent(),
        ),
      ),
      body: const Center(
        child: Text('Content'),
      ),
    );
  }
}