ChoiceChip 选择小条

和Chip组件类似的样式，有一些选择的属性。可以指定选中时的颜色、阴影色和选择事件。

相关组件

Chip ActionChip InputChip FilterChip RawChip

ChoiceChip的普通表现如下

【selectedColor】: 选中时颜色 【Color】
【selectedShadowColor】: 选中时阴影颜色 【Color】
【onSelected】: 选中事件 【Fuction(bool)】
其他属性同Chip组件，无右侧组件。

import 'package:flutter/material.dart';
class CustomChoiceChip extends StatefulWidget {
  @override
  _CustomChoiceChipState createState() => _CustomChoiceChipState();
}
class _CustomChoiceChipState extends State<CustomChoiceChip> {
  bool _select = false;
  @override
  Widget build(BuildContext context) {
    return ChoiceChip(
      selected: _select,
      padding: EdgeInsets.all(5),
      labelPadding: EdgeInsets.all(5),
      label: Text(
        _select ?
        "You are selected it." :
        "This is a ChoiceChip.",
        style: TextStyle(fontSize: 16),
      ),
      backgroundColor: Colors.grey.withAlpha(66),
      avatar: Image.asset("assets/images/icon_head.png"),
      selectedColor: Colors.orangeAccent.withAlpha(44),
      selectedShadowColor: Colors.blue,
      shadowColor: Colors.orangeAccent,
      elevation: 3,
      onSelected: (value) => setState(() => _select = value),
    );
  }
}