How do I disable a Button in Flutter

0 votes

I'm just starting to get the hang of Flutter, but I'm having trouble figuring out how to set the enabled state of a button.

From the docs, it says to set onPressed to null to disable a button, and give it a value to enable it. This is fine if the button continues to be in the same state for the lifecycle.

I get the impression I need to create a custom Stateful widget that will allow me to update the button's enabled state (or onPressed callback) somehow.

So my question is how would I do that? This seems like a pretty straightforward requirement, but I can't find anything in the docs on how to do it.

Thanks.

Mar 9, 2023 in Android by sarit
• 1,830 points
12,477 views

1 answer to this question.

0 votes

To disable a button in Flutter, you can set the onPressed property to null, which will prevent the button from being pressed. To enable the button, you can set the onPressed property to a non-null value.

To dynamically enable or disable a button based on some condition, you can use a StatefulWidget. Here's an example:

import 'package:flutter/material.dart';

class MyButton extends StatefulWidget {
  @override
  _MyButtonState createState() => _MyButtonState();
}

class _MyButtonState extends State<MyButton> {
  bool _isEnabled = true;

  void _toggleEnabled() {
    setState(() {
      _isEnabled = !_isEnabled;
    });
  }

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: _isEnabled ? _toggleEnabled : null,
      child: Text('My Button'),
    );
  }
}

In this example, we have a MyButton widget that has a boolean _isEnabled property that determines whether the button is enabled or disabled. The _toggleEnabled method toggles the _isEnabled property, and calls setState to rebuild the widget with the new value.

In the build method, we use the _isEnabled property to conditionally set the onPressed property of the ElevatedButton. If _isEnabled is true, we set the onPressed property to _toggleEnabled, which will enable the button and toggle the _isEnabled property when the button is pressed. If _isEnabled is false, we set the onPressed property to null, which will disable the button.

You can use this MyButton widget in your app like any other widget:

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: MyButton(),
        ),
      ),
    );
  }
}

This example is just one way to enable/disable a button dynamically. There are many other ways to achieve the same result depending on your specific use case.

To know more about Flutter, join our Flutter Course today.

answered Mar 10, 2023 by vinayak

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