自定义Flutter Tabbar

import 'dart:math';

import 'package:flutter/material.dart';

class UiTabBar extends StatefulWidget {
   
   
  UiTabBar({
   
   
    Key? key,
    this.width,
    this.height,
    this.padding = const EdgeInsets.symmetric(horizontal: 8),
    this.direction = Axis.horizontal,
    this.physics = const BouncingScrollPhysics(),
    this.style,
    this.unselectedStyle,
    required this.tabs,
    required this.currentIndex,
  }) : super(key: key);

  final List<UiTab> tabs;

  final Axis? direction;

  final double? height;

  final double? width;

  final EdgeInsets? padding;

  final TextStyle? style;

  final TextStyle? unselectedStyle;

  final ScrollPhysics physics;

  final int currentIndex;

  @override
  _UiTabBarState createState() => _UiTabBarState();
}

class _UiTabBarState extends State<UiTabBar> with TickerProviderStateMixin {
   
   
  ScrollController _scroll = ScrollController();
  late AnimationController _animation;
  late Point _size;

  @override
  void initState() {
   
   
    super