简介

保存chip主题的颜色，形状和文本样式

使用它配置chipTheme widget，或者为Theme widget小部件设置 ThemeData.chipTheme。

基本用法

创建ChipThemeData最简单的方法是使用copyWith您从得到一个ChipTheme.of，或创建一个全新的一个具有 ChipThemeData..fromDefaults

实例演示

import 'package:flutter/material.dart';

class ChipThemeDemo extends StatefulWidget {
  _ChipThemeDemoState createState() => _ChipThemeDemoState();
}

class _ChipThemeDemoState extends State<ChipThemeDemo> {
  Color _color = Colors.red;

  @override
  Widget build(BuildContext context) {
    return ChipTheme(
      data: ChipThemeData.fromDefaults(
        // brightness: Brightness.dark,
      labelStyle: TextStyle(fontSize: 15.0), 
      primaryColor: Colors.red,secondaryColor: Colors.red.shade800),
      child: ChoiceChip(
        padding: EdgeInsets.only(left: 100.0,right: 100.0,top: 10.0,bottom: 10.0),
        label: Text('down'),
        onSelected: (bool value) {
          setState(() {
            _color = value ? Colors.black : Colors.red;
          });
        },
        selected: _color == Colors.black,
      ),
    );
  }
}