flutter_green/lib/pages/login/welcome_page.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_green/routes/Routes.dart';

/// 欢迎页面：登录、注册，忘记密码
class WelcomePage extends StatefulWidget {
  @override
  _WelcomePageState createState() => _WelcomePageState();
}

class _WelcomePageState extends State<WelcomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: AnnotatedRegion<SystemUiOverlayStyle>(
        value: SystemUiOverlayStyle.light,
        child: Container(
          width: double.infinity,
          height: double.infinity,
          decoration: BoxDecoration(
            image: DecorationImage(
              fit: BoxFit.fill,
              image: AssetImage("assets/images/background.jpg"),
            ),
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Expanded(
                flex: 3,
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Container(
                      width: 65,
                      height: 65,
                      margin: EdgeInsets.only(
                        left: 30,
                      ),
                      padding: EdgeInsets.all(10),
                      decoration: BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.circular(10),
                      ),
                      child: Image(
                        image: AssetImage("assets/images/leaf.jpg"),
                      ),
                    ),
                  ],
                ),
              ),
              Expanded(
                flex: 6,
                child: Container(
                  padding: EdgeInsets.symmetric(horizontal: 28),
                  child: Text(
                    "Everyone should live with a little more green",
                    overflow: TextOverflow.fade,
                    style: TextStyle(
                        color: Colors.white,
                        fontSize: 41,
                        fontWeight: FontWeight.bold),
                  ),
                ),
              ),
              Expanded(
                flex: 3,
                child: Container(
                  padding: EdgeInsets.symmetric(horizontal: 29),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.center,
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: <Widget>[
                      Expanded(
                        flex: 4,
                        child: GestureDetector(
                          onTap: nextScreen,
                          child: Container(
                            decoration: BoxDecoration(
                                color: Color(0xFf142e32).withOpacity(0.93),
                                borderRadius: BorderRadius.circular(20)),
                            width: double.infinity,
                            child: Center(
                              child: Text(
                                "Sign up",
                                style: TextStyle(
                                    color: Colors.white,
                                    fontSize: 30,
                                    fontWeight: FontWeight.bold),
                              ),
                            ),
                          ),
                        ),
                      ),
                      Expanded(
                        flex: 2,
                        child: Container(),
                      ),
                      Expanded(
                        flex: 4,
                        child: GestureDetector(
                          onTap: () {
                            Navigator.of(context).pushNamed(Routes.loginPage);
                          },
                          child: Container(
                            decoration: BoxDecoration(
                                color: Colors.white,
                                borderRadius: BorderRadius.circular(20)),
                            width: double.infinity,
                            child: Center(
                              child: Text(
                                "Sign in",
                                style: TextStyle(
                                    color: Color(0xFF265e59),
                                    fontSize: 30,
                                    fontWeight: FontWeight.bold),
                              ),
                            ),
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
              ),
              Expanded(
                flex: 2,
                child: Center(
                  child: GestureDetector(
                    onTap: nextScreen,
                    child: Text(
                      "Forgot password?",
                      style: TextStyle(
                          color: Colors.white,
                          fontSize: 22,
                          decoration: TextDecoration.underline),
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  nextScreen() {
    Navigator.of(context).pushNamed(Routes.homePage);
  }
}