liangchengyou / wow_english

  import 'package:flutter/material.dart';

  import 'package:flutter_screenutil/flutter_screenutil.dart';

  import 'package:wow_english/common/extension/string_extension.dart';

  
  class WEAppBar extends StatelessWidget implements PreferredSizeWidget {
    final String? titleText;
    final bool? centerTitle;
    final VoidCallback? onBack;
    final Color? backgroundColor;
    final PreferredSizeWidget? bottom;

    final Widget? leading;

    final double? leadingWidth;

    final List<Widget>? actions;

    const WEAppBar({this.titleText,
      this.centerTitle = true,
      this.onBack,
      this.backgroundColor,
      this.bottom,
      this.leading,
      this.leadingWidth,
      this.actions,
      super.key});

  
    @override
    Widget build(BuildContext context) {
      return AppBar(
        centerTitle: centerTitle,

        title: Text(
          titleText ?? '',
          style: TextStyle(
            fontSize: 25.sp,
            color: const Color(0xFF333333),
            fontWeight: FontWeight.w700,

          ),
        ),

        leadingWidth: leadingWidth,

        leading: leading ??
            GestureDetector(

              onTap: () {
                if (onBack == null) {
                  Navigator.pop(context);
                } else {
                  onBack!();
                }
              },

              child: Container(
                alignment: Alignment.center,
                child: Image.asset(
                  'back_around'.assetPng,
                  height: 40.h,
                  width: 40.w,
                ),
              ),
            ),
        backgroundColor: backgroundColor ?? Colors.white,
        actions: actions ?? [],

      );
    }
  
    @override
    // TODO: implement preferredSize

    Size get preferredSize =>
        Size.fromHeight(kToolbarHeight +
            (bottom == null ? 0.0 : bottom!.preferredSize.height));

  }