| 1 | // Copyright 2014 The Flutter Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | import 'package:flutter/material.dart'; |
| 6 | |
| 7 | /// Flutter code sample for [Image.loadingBuilder]. |
| 8 | |
| 9 | void main() => runApp(const LoadingBuilderExampleApp()); |
| 10 | |
| 11 | class LoadingBuilderExampleApp extends StatelessWidget { |
| 12 | const LoadingBuilderExampleApp({super.key}); |
| 13 | |
| 14 | @override |
| 15 | Widget build(BuildContext context) { |
| 16 | return const MaterialApp( |
| 17 | home: LoadingBuilderExample(), |
| 18 | ); |
| 19 | } |
| 20 | } |
| 21 | |
| 22 | class LoadingBuilderExample extends StatelessWidget { |
| 23 | const LoadingBuilderExample({super.key}); |
| 24 | |
| 25 | @override |
| 26 | Widget build(BuildContext context) { |
| 27 | return DecoratedBox( |
| 28 | decoration: BoxDecoration( |
| 29 | color: Colors.white, |
| 30 | border: Border.all(), |
| 31 | borderRadius: BorderRadius.circular(20), |
| 32 | ), |
| 33 | child: Image.network( |
| 34 | 'https://flutter.github.io/assets-for-api-docs/assets/widgets/falcon.jpg', |
| 35 | loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { |
| 36 | if (loadingProgress == null) { |
| 37 | return child; |
| 38 | } |
| 39 | return Center( |
| 40 | child: CircularProgressIndicator( |
| 41 | value: loadingProgress.expectedTotalBytes != null |
| 42 | ? loadingProgress.cumulativeBytesLoaded / loadingProgress.expectedTotalBytes! |
| 43 | : null, |
| 44 | ), |
| 45 | ); |
| 46 | }, |
| 47 | ), |
| 48 | ); |
| 49 | } |
| 50 | } |
| 51 |