doctor_app_flutter/lib/widgets/auth/auth_header.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

import '../../config/size_config.dart';
import '../../lookups/auth_lookup.dart';

class AuthHeader extends StatelessWidget {
  var userType;
  AuthHeader(this.userType);

  @override
  Widget build(BuildContext context) {
    var screen = Container(
        margin: SizeConfig.isMobile
            ? null
            : EdgeInsetsDirectional.fromSTEB(SizeConfig.screenWidth * 0.30,
                SizeConfig.screenWidth * 0.1, 0, 0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                Container(
                  margin: SizeConfig.isMobile
                      ? EdgeInsetsDirectional.fromSTEB(0, 50, 0, 0)
                      : EdgeInsetsDirectional.fromSTEB(
                          SizeConfig.screenWidth * 0.13, 0, 0, 0),
                  child: buildImageLogo(),
                ),
                SizedBox(
                  height: 10,
                ),
                Container(
                  margin: SizeConfig.isMobile
                      ? null
                      : EdgeInsetsDirectional.fromSTEB(
                          SizeConfig.screenWidth * 0.13, 0, 0, 0),
                  child: buildTextUnderLogo(context),
                )
              ],
            ),
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: SizeConfig.isMobile
                  ? <Widget>[
                      SizedBox(
                        height: 10,
                      ),
                      buildWelText(),
                      buildDrSulText(context),
                    ]
                  : <Widget>[
                      SizedBox(
                        height: 10,
                      ),
                      Row(
                        mainAxisAlignment: MainAxisAlignment.start,
                        children: <Widget>[
                          buildWelText(),
                          buildDrSulText(context),
                        ],
                      ),
                    ],
            ),
            buildDrAppContainer(context)
          ],
        ));
    return screen;
  }

  Image buildImageLogo() {
    String img = 'assets/images/login_icon.png';
    if (userType == loginType.unknownUser) {
      img = 'assets/images/welcome_login_icon.png';
    }
    if (userType == loginType.verifyPassword) {
      img = 'assets/images/verified_icon.png';
    }

    return Image.asset(
      img,
      fit: BoxFit.cover,
      height: SizeConfig.isMobile ? null : SizeConfig.screenWidth * 0.09,
    );
  }

  Widget buildTextUnderLogo(context) {
    if (userType == loginType.knownUser || userType == loginType.unknownUser) {
      return Text(
        "LOGIN",
        style: TextStyle(
            fontSize: SizeConfig.isMobile ? 30 : SizeConfig.screenWidth * 0.035,
            fontWeight: FontWeight.w800),
      );
    } else {
      String text1;
      String text2;
      if (userType == loginType.changePassword) {
        text1 = 'Change';
        text2 = 'Password!';
      }
      if (userType == loginType.verifyPassword) {
        text1 = 'verify';
        text2 = 'Your Account!';
      }

      return Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          Text(
            text1,
            style: TextStyle(
                fontSize:
                    SizeConfig.isMobile ? 30 : SizeConfig.screenWidth * 0.035,
                fontWeight: FontWeight.w800),
          ),
          Text(
            text2,
            style: TextStyle(
                color: Theme.of(context).primaryColor,
                fontSize:
                    SizeConfig.isMobile ? 30 : SizeConfig.screenWidth * 0.035,
                fontWeight: FontWeight.w800),
          )
        ],
      );
    }
  }

  Container buildDrAppContainer(BuildContext context) {
    if (userType == loginType.changePassword  || userType == loginType.verifyPassword ) {
      return Container();
    }
    return Container(
      margin: SizeConfig.isMobile
          ? null
          : EdgeInsetsDirectional.fromSTEB(
              SizeConfig.screenWidth * 0.13, 0, 0, 0),
      child: Text(
        "Doctor App",
        style: TextStyle(
            fontSize: SizeConfig.isMobile ? 26 : SizeConfig.screenWidth * 0.030,
            fontWeight: FontWeight.w800,
            color: Theme.of(context).primaryColor),
      ),
    );
  }

  Text buildDrSulText(BuildContext context) {
    if (userType == loginType.changePassword  || userType == loginType.verifyPassword ) {
      return Text('');
    }
    return Text(
      'Dr Sulaiman Al Habib',
      style: TextStyle(
        fontWeight: FontWeight.w800,
        fontSize: SizeConfig.isMobile ? 24 : SizeConfig.screenWidth * 0.029,
        color: Theme.of(context).primaryColor,
      ),
    );
  }

  Widget buildWelText() {
    String text = 'Welcome to ';
    if (userType == loginType.unknownUser) {
      text = 'Welcome Back to ';
    }
    if (userType == loginType.changePassword  || userType == loginType.verifyPassword ) {
      return Text('');
    }
    return Text(
      text,
      style: TextStyle(
          fontSize: SizeConfig.isMobile ? 24 : SizeConfig.screenWidth * 0.029),
    );
  }
}