flutter-template/lib/pages/home.dart

import 'dart:io';

import 'package:ctjt_flutter/common/states.dart';
import 'package:ctjt_flutter/common/styles.dart';
import 'package:ctjt_flutter/common/time.dart';
import 'package:ctjt_flutter/widget/button.dart';
import 'package:ctjt_flutter/widget/contact.dart';
import 'package:ctjt_flutter/widget/drawer.dart';
import 'package:ctjt_flutter/widget/title.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:provider/provider.dart';

// 首页
class HomePage extends StatefulWidget {
  HomePage({Key? key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  int tts = 0;

  @override
  void initState() {
    super.initState();

    // 初始化状态
    States.init(context);

    // 显示隐私协议
    Future.delayed(Duration(seconds: 1), () {
      var flag = Provider.of<AppVersion>(context, listen: false).showContact;
      if (flag) {
        Contact.showUserContactDialog(context);
      }
    });
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    Styles.initSize(); // 在首页中初始化公共样式变量的值
  }

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      // 响应Android返回按钮，需要在首页最外层包装此组件
      child: Scaffold(
          backgroundColor: Colors.white,
          appBar: PageHead(
            leadingType: LeadingType.Menu,
            title: Text("Test"),
          ),
          // 左侧边栏
          drawer: DrawerMenu(),
          body: Column(
            children: [
              TButton(
                  onPressed: () {
                    Navigator.pushNamed(context, '/remote_call');
                  },
                  child: Text("呼叫测试")),
            ],
          )),
      onWillPop: () {
        if (Navigator.canPop(context)) {
          print('返回了 -- 回退一层');
          Navigator.pop(context);
        } else {
          int ticks = TimeUtils.getDayNow();
          if (ticks - tts <= 2000) {
            print('返回了 -- 退出程序');
            exit(0);
          } else {
            print('返回了 -- 再按一次退出程序');
            tts = ticks;
            Fluttertoast.showToast(
                msg: "再按一次退出程序",
                toastLength: Toast.LENGTH_LONG,
                gravity: ToastGravity.CENTER,
                timeInSecForIosWeb: 1);
          }
        }
        return new Future.value(false);
      },
    );
  }
}