huixiang_app/lib/community/community_view/class_title_tab.dart

import 'package:flutter/material.dart';
import 'package:huixiang/generated/l10n.dart';
import 'package:huixiang/retrofit/data/category_select_list.dart';
import 'package:huixiang/retrofit/data/goods_category.dart';
import 'package:huixiang/utils/font_weight.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:huixiang/view_widget/my_tab.dart';

class ClassTitleTab extends StatefulWidget {
  final List<CategorySelectList> classSelectList;
  final Function notifyClassSelectList;

  ClassTitleTab(this.classSelectList,this.notifyClassSelectList);

  @override
  State<StatefulWidget> createState() {
    return _ClassTitleTab();
  }
}

class _ClassTitleTab extends State<ClassTitleTab>
    with SingleTickerProviderStateMixin,AutomaticKeepAliveClientMixin {
 TabController tabController;

  @override
  void initState() {
    super.initState();
    if (widget.classSelectList != null && widget.classSelectList.length > 0)
      tabController = TabController(length: widget.classSelectList.length, vsync: this );
  }

  @override
  Widget build(BuildContext context) {
    return Container(
          alignment: Alignment.centerLeft,
          child: DefaultTabController(
            length:widget.classSelectList == null
                ? 0
                : widget.classSelectList.length,
            child: TabBar(
                isScrollable: true,
                //可滚动
                indicatorColor: Color(0xff39B54A),
                labelColor: Color(0xff32A060),
                labelStyle: TextStyle(
                  fontSize: 14.sp,
                  fontWeight: FontWeight.bold,
                ),
                unselectedLabelStyle: TextStyle(
                  fontSize: 14.sp,
                  fontWeight: MyFontWeight.regular,
                ),
                controller: tabController,
                //未选中文字颜色
                unselectedLabelColor: Color(0xff4D4D4D),
                indicatorSize: TabBarIndicatorSize.label,
                onTap: (index){
                  widget.notifyClassSelectList(index);
                },
                //指示器与文字等宽
                tabs:widget.classSelectList == null
                ? []
                    : widget.classSelectList
                .map((e) => MyTab(text: e.name))
                .toList(),
              ),
            ),
          );
  }

 @override
 bool get wantKeepAlive => true;
}