examples/api/lib/widgets/image/image.frame_builder.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.

// Template: dev/snippets/config/templates/stateless_widget_material.tmpl
//
// Comment lines marked with "▼▼▼" and "▲▲▲" are used for authoring
// of samples, and may be ignored if you are just exploring the sample.

// Flutter code sample for Image.frameBuilder
//
//***************************************************************************
//* ▼▼▼▼▼▼▼▼ description ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)

// The following sample demonstrates how to use this builder to implement an
// image that fades in once it's been loaded.
//
// This sample contains a limited subset of the functionality that the
// [FadeInImage] widget provides out of the box.

//* ▲▲▲▲▲▲▲▲ description ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
//***************************************************************************

import 'package:flutter/material.dart';

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

/// This is the main application widget.
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

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

/// This is the stateless widget that the main application instantiates.
class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key? key}) : super(key: key);

  @override
//********************************************************************
//* ▼▼▼▼▼▼▼▼ code ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)

  @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/puffin.jpg',
        frameBuilder: (BuildContext context, Widget child, int? frame,
            bool wasSynchronouslyLoaded) {
          if (wasSynchronouslyLoaded) {
            return child;
          }
          return AnimatedOpacity(
            child: child,
            opacity: frame == null ? 0 : 1,
            duration: const Duration(seconds: 1),
            curve: Curves.easeOut,
          );
        },
      ),
    );
  }

//* ▲▲▲▲▲▲▲▲ code ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
//********************************************************************

}