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import 'package:flutter/material.dart';
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import 'package:flutter_screenutil/screen_util.dart';
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import '../services/EventBus.dart';
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import '../components/dioFun.dart';
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//错误提示
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// This class (or a class which this class inherits from) is marked as '@immutable', but one or more of
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// This class (or a class that this class inherits from) is marked as '@immutable', but one or more of
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//
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// 原本是自定义一个导航栏，需要传递一个参数（标题）过来。
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// class NavWidget extends StatelessWidget {
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// String title; //
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// NavWidget(this.title);
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// 结果就提示了上面的错误。看了下有道翻译
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// 有道翻译：这个类(或该类继承自的一个类)被标记为“@不可变”，但是它的一个或多个实例字段不是final: NavWidget.title
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// 意为StatelessWidget是一个不可变的widget，申明的title也应为不可变的。所以我就加了个申明的关键字final。然后警告就没了
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//
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// 以下是修改后的代码，不再报错
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// class NavWidget extends StatelessWidget {
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// final String title; //
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// NavWidget(this.title);
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class CheckboxButtonItem extends StatefulWidget {
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final int index;
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CheckboxButtonItem(this.index); //I don't know what is this index for but I will put it in anyway
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@override
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_CheckboxButtonItemState createState() => _CheckboxButtonItemState();
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}
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class _CheckboxButtonItemState extends State<CheckboxButtonItem> {
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//try_setState(); //避免如下异常报错
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try_setState() {
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try {
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setState(() {});
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} catch (e) {
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print('setState(() {})异常：${e}');
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}
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}
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@override
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void initState() {
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//黑烟审核推送交警Checkbox改变事件
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eventBus.on<HycsDataAuditSfyc>().listen((event) {
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print(event.str);
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try_setState(); //避免如下异常报错
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});
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super.initState();
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}
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//自定义带说明图标按钮函数。点击说明文字有反应
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Widget _getCheckboxButton() {
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return Container(
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width: ScreenUtil().setWidth(330),
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height: ScreenUtil().setWidth(110),
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alignment: const Alignment(0, 1),
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decoration: BoxDecoration(
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border: Border.all(color: Colors.grey[600], width: 1),
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borderRadius: BorderRadius.circular(3),
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),
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child: FlatButton(
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padding: EdgeInsets.all(0),
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onPressed: !fh_hyc
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? null
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: () {
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tsjj = !tsjj;
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//黑烟审核推送交警Checkbox改变广播
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eventBus.fire(HycsDataAuditCheckboxButton('黑烟审核推送交警Checkbox已改变', tsjj));
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print('tsjj = $tsjj');
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setState(() {});
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},
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color: Colors.transparent,
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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crossAxisAlignment: CrossAxisAlignment.center,
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children: <Widget>[
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Text('同时推送交警',
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style: TextStyle(color: !fh_hyc || 1 == sfyc ? Colors.grey : null, fontSize: 12)),
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SizedBox(width: 1),
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!fh_hyc || 1 == sfyc
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? Icon(Icons.check_box_outline_blank, color: Colors.grey)
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: tsjj
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? Icon(Icons.check_box, color: Colors.blue)
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: Icon(Icons.check_box_outline_blank, color: Colors.black),
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],
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),
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),
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);
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}
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@override
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Widget build(BuildContext context) {
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return _getCheckboxButton();
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}
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}
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