Flutter – Banner Widget

Flutter Banner widget displays a message box diagonally on the corner of its child widget.

Syntax

The syntax of a Center widget to center other widget is

Banner(
  message: 'New Arrival',
  location: BannerLocation.topStart,
  child: someWidget,
)

The message to be displayed in the banner is specified via message property, and the location of the banner on the child widget is specified via location property.

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Example

In the following example, we create a Flutter Application with a Banner widget. Banner widget’s child is a Container widget with Text. We shall display the banner on the top left of the the child Container.

main.dart

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

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

  static const String _title = 'Flutter Tutorial';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Container(
        padding: const EdgeInsets.all(10),
        child: Banner(
          message: 'New Arrival',
          location: BannerLocation.topStart,
          child: Container(
            height: 200,
            width: 200,
            color: Colors.yellow,
            alignment: Alignment.center,
            child: const Text('Some Item'),
          ),
        ),
      )
    );
  }
}

Screenshot – iPhone Simulator

Screenshot – Android Emulator

Conclusion

In this Flutter Tutorial, we learned what Banner widget is, and how to use it in our Flutter application, with examples.