Flutter tabbar indicator size

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The `indicatorSize` property in Flutter’s `TabBar` widget is used to define the size of the tab indicator. It can be customized to have either a fixed width or a tab’s label size.

To change the size of the tab indicator in the `TabBar`, you need to set the `indicatorSize` property of `TabBar` to one of the available options: `TabBarIndicatorSize.tab` or `TabBarIndicatorSize.label`.

Here’s an example of how to use `indicatorSize` with both options:

“`dart
import ‘package:flutter/material.dart’;

class MyTabBar extends StatelessWidget {
@override
Widget build(BuildContext context) {
return DefaultTabController(
length: 3,
child: Scaffold(
appBar: AppBar(
title: Text(‘TabBar Indicator Size’),
bottom: TabBar(
indicatorSize: TabBarIndicatorSize.tab, // Fixed width tab indicator
tabs: [
Tab(child: Text(‘Tab 1’)),
Tab(child: Text(‘Tab 2’)),
Tab(child: Text(‘Tab 3’)),
],
),
),
body: TabBarView(
children: [
Container(
color: Colors.red,
),
Container(
color: Colors.green,
),
Container(
color: Colors.blue,
),
],
),
),
);
}
}
“`

In this example, the `indicatorSize` property is set to `TabBarIndicatorSize.tab`, which means the tab indicator will have a fixed width equal to the width of the tab itself.

If you want the tab indicator to have the same width as the tab’s label, you can set the `indicatorSize` property to `TabBarIndicatorSize.label`:

“`dart
TabBar(
indicatorSize: TabBarIndicatorSize.label, // Tab label width tab indicator
tabs: [
Tab(child: Text(‘Tab 1’)),
Tab(child: Text(‘Tab 2’)),
Tab(child: Text(‘Tab 3’)),
],
)
“`

This will make the tab indicator width expand to the width of the tab label.

Remember to import the necessary Flutter packages and wrap the `TabBar` widget inside an `AppBar` widget with a `Scaffold` widget. The `TabBarView` widget is used to define the contents of each tab.

Please note that the complete HTML structure with ``, ``, and `` tags cannot be included in a single `div` element. Nonetheless, you can use this HTML snippet as part of an HTML document within appropriate tags.

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