flutter_flutter/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.

import 'package:flutter/material.dart';

/// Flutter code sample for [Image.frameBuilder].

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(home: FrameBuilderExample());
  }
}

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

  @override
  @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(
                opacity: frame == null ? 0 : 1,
                duration: const Duration(seconds: 1),
                curve: Curves.easeOut,
                child: child,
              );
            },
      ),
    );
  }
}