動機 しばらく書かないと、すぐ忘れてしまうので。 以前、以下のVoidCallbackの記事を書いたところ、忘れづらくなった感覚があったり、 Web上にあると、どこからでも参照出来るので便利であると感じています。 使用例 Flutter 2.0.1 で動作確認しました。 import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'ValueChanged Sample', theme: T
![Flutterの名前付きコールバック ValueChanged - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/f128d73e1fd9caca1d8971b7706982e02883c604/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9Rmx1dHRlciVFMyU4MSVBRSVFNSU5MCU4RCVFNSU4OSU4RCVFNCVCQiU5OCVFMyU4MSU4RCVFMyU4MiVCMyVFMyU4MyVCQyVFMyU4MyVBQiVFMyU4MyU5MCVFMyU4MyU4MyVFMyU4MiVBRiUyMFZhbHVlQ2hhbmdlZCZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9MzBhMTgzMDNiN2ZiOWM5MTc0YWFkMTRhNTRjZWRmMDI%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDB0b2RhLWF4aWF3b3JrcyZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTM2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9ZDAyN2Q1Mjc0MTE4MzFjYmNmYTBjNmFjYTYwNmMyYmY%26blend-x%3D142%26blend-y%3D436%26blend-mode%3Dnormal%26txt64%3DaW4gQXhpYSBXb3JrcyBMTEM%26txt-width%3D770%26txt-clip%3Dend%252Cellipsis%26txt-color%3D%2523212121%26txt-font%3DHiragino%2520Sans%2520W6%26txt-size%3D36%26txt-x%3D156%26txt-y%3D536%26s%3Dc45a7ce6e75552ac58228ecbee57b68c)