添加点按涟漪效果 (Material Design)

当我们在开发遵循 Material Design 规范应用的时候,我们可能会需要为某个 widgets 的点击加入涟漪效果。

Flutter 提供了 InkWell widget 来实现这个功能。你可以通过以下步骤实现涟漪效果:

  1. 创建一个想要点击的 widget;

  2. InkWell widget 包裹它,并设置回调函数,就可以显示涟漪动画了。

dart
// The InkWell wraps the custom flat button widget.
InkWell(
  // When the user taps the button, show a snackbar.
  onTap: () {
    ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
      content: Text('Tap'),
    ));
  },
  child: const Padding(
    padding: EdgeInsets.all(12),
    child: Text('Flat Button'),
  ),
)

交互式样例

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

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    const title = 'InkWell Demo';

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

class MyHomePage extends StatelessWidget {
  final String title;

  const MyHomePage({super.key, required this.title});

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

class MyButton extends StatelessWidget {
  const MyButton({super.key});

  @override
  Widget build(BuildContext context) {
    // The InkWell wraps the custom flat button widget.
    return InkWell(
      // When the user taps the button, show a snackbar.
      onTap: () {
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
          content: Text('Tap'),
        ));
      },
      child: const Padding(
        padding: EdgeInsets.all(12),
        child: Text('Flat Button'),
      ),
    );
  }
}