【 Flutter 】Flutter を 基礎 から 学習 ( ウィジェット編 ) part84 Scrolling

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(home: new MyApp()));
}

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _State();
  }
}

class _State extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('テスト中です。'),
        ),
        body: GridView.builder(
          gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 3,
            mainAxisSpacing: 8,
            crossAxisSpacing: 16.0,
            childAspectRatio: 2,
          ),
          scrollDirection: Axis.vertical,
          primary: false,
          padding: const EdgeInsets.all(32.0),
          itemCount: 7, // ここを省略すると無限グリッドビューになります。
          itemBuilder: (context, index) {
            return box((index + 1).toString());
          },
        ),
      ),
    );
  }

  Container box(String text) {
    return Container(
      alignment: Alignment.center,
      width: 100,
      height: 100,
      color: Colors.green,
      child: Text(text),
    );
  }
}