mobileCyberGamesApp/lib/pages/StartWindow.dart

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

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

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

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

    animationController = AnimationController(
      vsync: this,
      duration: Duration(seconds: 10),
    );
    animationController.repeat();
    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) {
    return GestureDetector(
      // onTap: () {
      //   Navigator.of(context).pop();
      // },
      child: WillPopScope(
        child: Scaffold(
          backgroundColor: Color(0xCC000000),
          body: Container(
            child: Center(
              child: Container(
                padding: EdgeInsets.only(top: 28, bottom: 30),
                width: 270,
                height: 334,
                decoration: BoxDecoration(
                  color: Color(0xE6293559),
                  border: Border.all(width: 1, color: PRIMARY_COLOR),
                  image: DecorationImage(image: AssetImage('images/img_guangmang.png'), fit: BoxFit.contain),
                ),
                child: Stack(
                  children: <Widget>[
                    Align(
                      alignment: Alignment.topCenter,
                      child: Text(
                        '点击确认开始游戏',
                        style: TextStyle(
                          color: PRIMARY_COLOR,
                          fontSize: 20,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ),
                    _centerContent(),
                    Align(
                      alignment: Alignment.bottomCenter,
                      child: Container(
                        padding: EdgeInsets.fromLTRB(25, 0, 25, 0),
                        width: double.infinity,
                        child: MaterialButton(
                          highlightElevation: 0,
                          height: 36,
                          color: PRIMARY_COLOR,
                          child: Text(
                            '确认',
                            style: TextStyle(
                              fontSize: 14,
                              fontWeight: FontWeight.bold,
                              color: Colors.white,
                            ),
                          ),
                          onPressed: () {
                            timer.cancel();
                            Navigator.of(context).pop(true);
                          },
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ),
        ),
        onWillPop: () {
          return Future.value(false);
        },
      ),
    );
  }

  Widget _centerContent() {
    return Stack(
      children: <Widget>[
        Center(
          child: Container(
            width: 128,
            height: 128,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.all(Radius.circular(100)),
              color: PRIMARY_COLOR,
              boxShadow: [
                BoxShadow(
                  color: Color(0xD41990F8),
                  offset: Offset.zero,
                  blurRadius: 17,
                ),
              ],
            ),
          ),
        ),
        Center(
          child: Container(
            width: 80,
            height: 80,
            decoration: BoxDecoration(
              color: Color(0xFF26D1FB),
              borderRadius: BorderRadius.all(Radius.circular(40)),
            ),
          ),
        ),
        Center(
          child: Container(
            width: 64,
            height: 64,
            decoration: BoxDecoration(
              color: Color(0xFF0E88CA),
              borderRadius: BorderRadius.all(Radius.circular(32)),
            ),
          ),
        ),
        Center(
          child: AnimatedBuilder(
            animation: animationController,
            child: Image.asset('images/spinner.png'),
            builder: (context, widget) {
              return Transform.rotate(
                angle: -animationController.value * 6.3,
                child: widget,
              );
            },
          ),
        ),
        Center(
          child: Text(
            '$_num',
            style: TextStyle(color: Colors.white, fontSize: 34, fontWeight: FontWeight.bold),
          ),
        ),
      ],
    );
  }
}