TabBar(
             indicator: ColorTabIndicator(Colors.blue),
             labelColor: Colors.black,
             tabs: [
               Tab(text: "Tab0"),
               Tab(text: "Tab1"),
             ],
             controller: tabController,
           )

  ///if linkedParentTabBarView is true and current tabbarview over scroll,
  ///it will check whether ancestor tabbarView can be scroll
  ///then scroll ancestor tabbarView
  final bool linkWithAncestor;
  
  
  ExtendedTabBarView(
   children: <Widget>[
   List("Tab000"),
   List("Tab001"),
   List("Tab002"),
   List("Tab003"),
   ],
   controller: tabController2,
   linkWithAncestor: true,
   )

  /// cache page count
  /// default is 0.
  /// if cacheExtent is 1, it has two pages in cache
  /// null is infinity, it will cache all pages
  final int cacheExtent;
  
  ExtendedTabBarView(
   children: <Widget>[
   List("Tab000"),
   List("Tab001"),
   List("Tab002"),
   List("Tab003"),
   ],
   controller: tabController2,
   linkWithAncestor: true,
   cacheExtent: 1,
   )