mobileCyberGamesApp/lib/pages/StartWindow.dart

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'OpenRoom.dart'; //创建房间
import 'dart:async';

class StartWindow extends StatefulWidget {
  @override
  StartWindowState createState() => StartWindowState();
}

class StartWindowState extends State<StartWindow> {
  int _num = 10;
  bool isNext = true;
  Timer timer;
 

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

    timer=Timer.periodic(Duration(seconds: 1), (timer){
        if(_num==0){
          Navigator.of(context).pop(false);
          timer.cancel();
        }
        else {
          setState(() {
           _num--; 
          });
        }
    });
  }

  @override
  Widget build(BuildContext context) {
    ScreenUtil.instance = ScreenUtil(width: 375, height: 667)..init(context);
    return GestureDetector(
      // onTap: () {
      //   Navigator.of(context).pop();
      // },
      child: WillPopScope(
        child: Scaffold(
          backgroundColor: Color(0xCC000000),
          body: Container(
            child: Center(
                child: Container(
              padding: EdgeInsets.only(top: 29, bottom: 21),
              width: ScreenUtil().setWidth(272),
              height: ScreenUtil().setWidth(319),
              decoration: BoxDecoration(
                  image: DecorationImage(
                image: AssetImage('images/img_kaishiyouxi.png'),
              )),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: <Widget>[
                  Text('点击确认开始游戏', style: TextStyle(color: Color(0xFFFDC372), fontSize: 20, fontWeight: FontWeight.w600)),
                  _centerContent(),
                  Container(
                    width: double.infinity,
                    margin: EdgeInsets.symmetric(horizontal: 42),
                    height: 44,
                    child: RaisedButton(
                      textTheme: ButtonTextTheme.primary,
                      child: Text('确认'),
                      onPressed: () {
                        timer.cancel();
                       Navigator.of(context).pop(true);
                      },
                    ),
                  )
                ],
              ),
            )),
          ),
        ),
        onWillPop: () {
          return Future.value(false);
        },
      ),
    );
  }

  Widget _centerContent() {
    return Container(
      width: ScreenUtil().setWidth(131),
      height: ScreenUtil().setWidth(131),
      decoration: BoxDecoration(
        borderRadius: BorderRadius.all(Radius.circular(100)),
        gradient: LinearGradient(
          colors: [Color(0xFFC18C4A), Color(0xFFE2AD5C)],
          begin: Alignment.topCenter,
          end: Alignment.bottomCenter,
        ),
      ),
      child: Center(
        child: Container(
          width: ScreenUtil().setWidth(80),
          height: ScreenUtil().setWidth(80),
          decoration: BoxDecoration(
            borderRadius: BorderRadius.all(Radius.circular(100)),
            color: Color(0xFFF5C271),
          ),
          child: Center(
            child: Container(
              width: ScreenUtil().setWidth(60),
              height: ScreenUtil().setWidth(60),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.all(Radius.circular(100)),
                gradient: LinearGradient(
                  colors: [Color(0xFFDF605C), Color(0xFFB34B48)],
                  begin: Alignment.topLeft,
                  end: Alignment.bottomRight,
                ),
              ),
              child: Center(
                child: Text(
                  '$_num',
                  style: TextStyle(color: Colors.white, fontSize: 32, fontWeight: FontWeight.w600),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}