flutter tabBar example

tabbar.dart

import 'dart:math';

import 'package:flutter/material.dart';

const height = 80.0;
const gradientBreakPoint = .9;
const tabBarLen = 10;
void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: DefaultTabController(
        length: tabBarLen,
        initialIndex: 1,
        child: Column(
          children: [
            Container(
              color: Colors.green,
              height: height,
              child: SingleChildScrollView(
                child: TabBar(
                  labelColor: Colors.white,
                  physics: const BouncingScrollPhysics(),
                  unselectedLabelColor: Colors.black,
                  indicatorSize: TabBarIndicatorSize.tab,
                  isScrollable: true,
                  indicator: const BoxDecoration(
                    gradient: LinearGradient(
                      colors: [
                        Colors.transparent,
                        Colors.transparent,
                        Colors.white,
                        Colors.white,
                      ],
                      begin: Alignment.topCenter,
                      end: Alignment.bottomCenter,
                      stops: [
                        0,
                        gradientBreakPoint,
                        gradientBreakPoint,
                        height
                      ],
                    ),
                  ),
                  tabs: List.generate(
                    tabBarLen,
                    (index) => SizedBox(
                      height: height,
                      child: Center(child: Text("hm" + "m" * (index))),
                    ),
                  ),
                ),
              ),
            ),
            Expanded(
              child: TabBarView(
                  children: List.generate(
                tabBarLen,
                (index) => Center(child: Text(index.toString())),
              )),
            )
          ],
        ),
      ),
    );
  }
}