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samples/animations/lib/src/misc/animated_switcher.dart
Eric Windmill 2999d738b8 Dart 3.9 / Flutter 3.35 [first LLM release] (#2714)
I got carried away with Gemini and basically rewrote CI and the release
process for the new LLM reality. This work was largely completed by
Gemini.

- Bump all SDK versions to the current beta (3.9.0-0)
- Run `flutter channel beta`
- Wrote `ci_script.dart` to replace the bash scripts
- Converted repository to pub workspace #2499 
- Added llm.md and release.md
- Added redirect for deprecated Samples Index

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I have added sample code updates to the [changelog].
- [x] I updated/added relevant documentation (doc comments with `///`).
2025-08-14 12:26:24 -07:00

71 lines
2.0 KiB
Dart

// Copyright 2020 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:math';
import 'package:flutter/material.dart';
Color generateColor() => Color(0xFFFFFFFF & Random().nextInt(0xFFFFFFFF));
Widget generateContainer(int keyCount) => Container(
key: ValueKey<int>(keyCount),
height: Random().nextDouble() * 200,
width: Random().nextDouble() * 200,
decoration: BoxDecoration(
color: generateColor(),
borderRadius: BorderRadius.circular(Random().nextDouble() * 100),
border: Border.all(
color: generateColor(),
width: Random().nextDouble() * 5,
),
),
);
class AnimatedSwitcherDemo extends StatefulWidget {
const AnimatedSwitcherDemo({super.key});
static String routeName = 'misc/animated_switcher';
@override
State<AnimatedSwitcherDemo> createState() => _AnimatedSwitcherDemoState();
}
class _AnimatedSwitcherDemoState extends State<AnimatedSwitcherDemo> {
late Widget container;
late int keyCount;
@override
void initState() {
super.initState();
keyCount = 0;
container = generateContainer(keyCount);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('AnimatedSwitcher'),
actions: [
TextButton(
onPressed: () =>
setState(() => container = generateContainer(++keyCount)),
child: const Text('Change Widget'),
),
],
),
body: Center(
// AnimatedSwitcher Widget is used to switch between different widgets
// with a given transition. You can change the transitions by using
// transitionBuilder property.
child: AnimatedSwitcher(
duration: const Duration(seconds: 1),
child: container,
transitionBuilder: (child, animation) =>
ScaleTransition(scale: animation, child: child),
),
),
);
}
}