Flutter: Creating an Auto-Resize TextField

Last updated on October 6, 2022 A Goodman Loading... One comment

In Flutter, you can create an auto-resize (as needed) TextField (or TextFormField) in one of the following ways:

  • Set the maxlines argument to null. The text field can expand forever if a lot of text is entered.
  • Set minLines to 1 and maxLines to N (a positive integer). The text field will automatically expand or shrink based on the length of the entered text. It will stop expanding and start scrolling if it reaches N lines.

The example below will demonstrate the second approach.

Example Preview:

The code:

// kindacode.com
// main.dart
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      // hide debug banner
      debugShowCheckedModeBanner: false,
      title: 'KindaCode.com',
      theme: ThemeData(
        // enable Material 3
        useMaterial3: true,
        primarySwatch: Colors.blue,
      ),
      home: const KindaCodeDemo(),
    );
  }
}

class KindaCodeDemo extends StatelessWidget {
  const KindaCodeDemo({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('KindaCode.com'),
      ),
      body: const Padding(
        padding: EdgeInsets.all(30),
        child: Center(
          // implement the text field
          child: TextField(
            minLines: 1,
            maxLines: 10,
            style: TextStyle(fontSize: 20),
            decoration: InputDecoration(border: OutlineInputBorder()),
          ),
        ),
      ),
    );
  }
}

Further reading:

You can also take a tour around our Flutter topic page and Dart topic page to see the latest tutorials and examples.

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Ahmet
Ahmet
1 year ago

“maxLines: null” it also happens with

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