Flutter ElevatedButton – onLongPress

Flutter ElevatedButton onLongPress

To perform an action when the Flutter ElevatedButton is long pressed, assign the callback function to onLongPress property of this ElevatedButton.

Syntax

ElevatedButton(
  onPressed: () {},
  onLongPress: () {
    //executes when the button is long pressed
  },
  child: const Text('Submit'),
),

Example

Flutter Application with ElevatedButton widget 'Submit'. onLongPress callback is set to display a SnackBar when this button is long pressed.

main.dart

import 'package:flutter/material.dart';

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

/// main application widget
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Application';

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

/// stateful widget that the main application instantiates
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

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

/// private State class that goes with MyStatefulWidget
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    final ButtonStyle style =
    ElevatedButton.styleFrom(textStyle: const TextStyle(fontSize: 20));

    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          ElevatedButton(
            style: style,
            onPressed: () {},
            onLongPress: () {
              ScaffoldMessenger.of(context).showSnackBar(
                  const SnackBar(content: Text('You long pressed Submit button.')));
            },
            child: const Text('Submit'),
          ),
        ],
      ),
    );
  }
}

Output