1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
// 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 [Image.loadingBuilder].
void main() => runApp(const LoadingBuilderExampleApp());
class LoadingBuilderExampleApp extends StatelessWidget {
const LoadingBuilderExampleApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: LoadingBuilderExample(),
);
}
}
class LoadingBuilderExample extends StatelessWidget {
const LoadingBuilderExample({super.key});
@override
Widget build(BuildContext context) {
return DecoratedBox(
decoration: BoxDecoration(
color: Colors.white,
border: Border.all(),
borderRadius: BorderRadius.circular(20),
),
child: Image.network(
'https://flutter.github.io/assets-for-api-docs/assets/widgets/falcon.jpg',
loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) {
if (loadingProgress == null) {
return child;
}
return Center(
child: CircularProgressIndicator(
value: loadingProgress.expectedTotalBytes != null
? loadingProgress.cumulativeBytesLoaded / loadingProgress.expectedTotalBytes!
: null,
),
);
},
),
);
}
}