wrap_example.dart

wrap_example.dart

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: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Wrap(
          spacing: 16,
          runSpacing: 16,
          children: [
            View(
              title: "Pteranodon",
            ),
            View(
              title: "Cobra",
            ),
            View(
              title: "Mountain Gorilla",
            ),
            View(
              title: "Giraffe",
            ),
            View(
              title: "blue whale",
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

class View extends StatelessWidget {
  const View({Key key, this.title}) : super(key: key);

  final String title;
  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        border: Border.all(color: Colors.black45, width: 1),
        borderRadius: BorderRadius.circular(8.0),
      ),
      child: Padding(
        padding: const EdgeInsets.all(8.0),
        // POINT: IntrinsicWidthをつかう
        child: IntrinsicWidth(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(title),
              Row(
                mainAxisSize: MainAxisSize.max,
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Icon(Icons.edit),
                  Icon(Icons.delete),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}