Flutter学习 — 添加Material触摸水波效果

效果图一：

点击按钮出现灰色水波纹特效

效果图二：

显示底部弹出框

代码+注释：

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final title = 'InkWell Demo';

    return new MaterialApp(
      title: title,
      home: new MyHomePage(title: title),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final String title;

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

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(title),
      ),
      body: new Center(child: new MyButton()),
    );
  }
}

class MyButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // The InkWell Wraps our custom flat button Widget
    /// InkWell 有水波纹, GestureDetector 没有水波纹
    return new InkWell(
      // When the user taps the button, show a snackbar
      // 当用户点击按钮时，显示 snackbar
      onTap: () {
        Scaffold.of(context).showSnackBar(new SnackBar(
          content: new Text('Tap'),
        ));
      },
      child: new Container(
        padding: new EdgeInsets.all(12.0),
        child: new Text('Flat Button'),
      ),
    );
  }
}

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更多原理请参考谷歌官网：添加Material触摸水波效果