How to Use IndexedStack Widget In Flutter?

The application is built by settling how the widgets interact with one another. It suggests that the basis of your application is a widget.

Nearly everything in Flutter is a widget, including layout models. The widgets are where you will find the images, icons, and text in a Flutter application. The rows, columns, and grids that arrange, constrain, and align the evident widgets are examples of non-visible extra widgets.

In this article, we will Explore IndexedStack Widget In Flutter.

Here is the constructor of the IndexStack widget.

IndexedStack(
{Key? key,
AlignmentGeometry alignment=AlignmentDirectional.topStart,
TextDirection? textDirection,
StackFit sizing = StackFit.loose,
int? index = 0,
List children = const []}
)

alignment: The non-positioned and partially-positioned children in the stack are aligned using these attributes.

text direction: These properties are used to determine alignment based on the text direction.

sizing: The non-positioned children in the stack are sized using these properties.

index: These attributes are used to display the child’s index.

children: The List uses these properties.

An IndexedStack is a stack in which its index only allows for the display of one component at a time.

a stack that displays a single child from a group of children. It is the child with the specified index who is being shown.

How to construct a custom navigation bar in flutter is demonstrated in the below demo. It demonstrates how a Flutter mobile application development company will use the IndexedStack widget to create a custom navigation bar.

Let’s see a full example of an IndexStack widget.

import 'package:flutter/material.dart';
void main() => runApp(const MaterialApp(home: IndexStackDemo()));
class IndexStackDemo extends StatefulWidget {
  const IndexStackDemo({Key? key}) : super(key: key);
  @override
  _IndexStackDemoState createState() => _IndexStackDemoState();
}
class _IndexStackDemoState extends State {
  int index = 0;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Indexed Stack Demo'),
      ),
      body: Padding(
        child: Column(
          children: [_stackedContainers(), _navigationButtons()],
        ),
        padding: const EdgeInsets.all(5.0),
      ),
    );
  }
  Widget _stackedContainers() {
    return Expanded(
      child: IndexedStack(
        index: index,
        children: const [
          Center(
            child: Icon(
              Icons.home,
              size: 100,
            ),
          ),
          Center(
            child: Icon(
              Icons.list,
              size: 100,
            ),
          ),
          Center(
            child: Icon(
              Icons.settings,
              size: 100,
            ),
          ),
        ],
      ),
    );
  }
  Widget _navigationButtons() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        ElevatedButton(
          child: const Text(
            'Home',
            style: TextStyle(fontSize: 16.0, color: Colors.white),
          ),
          onPressed: () {
            setState(() {
              index = 0;
            });
          },
        ),
        ElevatedButton(
          child: const Text(
            'List',
            style: TextStyle(fontSize: 16.0, color: Colors.white),
          ),
          onPressed: () {
            setState(() {
              index = 1;
            });
          },
        ),
        ElevatedButton(
          child: const Text(
            'Settings',
            style: TextStyle(fontSize: 16.0, color: Colors.white),
          ),
          onPressed: () {
            setState(() {
              index = 2;
            });
          },
        ),
      ],
    );
  }
}

Output:

Conclusion:

Today our Flutter experts has given a basic explanation of the IndexedStack Widget’s fundamental structure in the article; you are free to change the code as you see fit. This was a brief introduction from my end to the IndexedStack Widget On User Interaction, which utilizes Flutter to function.