scale_transition.0.dart 1.6 KB
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// 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';

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/// Flutter code sample for [ScaleTransition].
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void main() => runApp(const ScaleTransitionExampleApp());
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class ScaleTransitionExampleApp extends StatelessWidget {
  const ScaleTransitionExampleApp({super.key});
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  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
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      home: ScaleTransitionExample(),
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    );
  }
}

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class ScaleTransitionExample extends StatefulWidget {
  const ScaleTransitionExample({super.key});
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  @override
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  State<ScaleTransitionExample> createState() => _ScaleTransitionExampleState();
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}

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/// [AnimationController]s can be created with `vsync: this` because of
/// [TickerProviderStateMixin].
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class _ScaleTransitionExampleState extends State<ScaleTransitionExample> with TickerProviderStateMixin {
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  late final AnimationController _controller = AnimationController(
    duration: const Duration(seconds: 2),
    vsync: this,
  )..repeat(reverse: true);
  late final Animation<double> _animation = CurvedAnimation(
    parent: _controller,
    curve: Curves.fastOutSlowIn,
  );

  @override
  void dispose() {
    _controller.dispose();
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    super.dispose();
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  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: ScaleTransition(
          scale: _animation,
          child: const Padding(
            padding: EdgeInsets.all(8.0),
            child: FlutterLogo(size: 150.0),
          ),
        ),
      ),
    );
  }
}