byte_size_formatter

Description:

byte size formatter

byte_size_formatter #
A TextInputFormatter that limits input based on byte-size
import 'package:byte_size_formatter/byte_size_formatter.dart';

TextField(
decoration: InputDecoration(helperText: '4-byte max'),
inputFormatters: [
ByteSizeFormatter(
sizeInBytes: 4, // Limits text input to a string of 4-bytes or less
onTruncate: (TextEditingValue oldValue, TextEditingValue newValue, TextEditingValue finalValue) {
/// [oldValue] is the TextEditingValue before the truncated text was entered
/// [newValue] is the TextEditingValue after the truncated text was entered,
/// but before truncating
/// [finalValue] is the TextEditingValue after text is truncated
},
),
],
);
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ByteSizeFormatter #
Required

int sizeInBytes - Text will be truncated once it reaches this byte-size

Optional


void onTruncate(TextEditingValue oldValue, TextEditingValue newValue, TextEditingValue finalValue) - Callback that occurs when text is truncated


int maxBytesPerCharacter - Defaults to 4. Controls how many characters can be safely input before checking byte-size. Useful to improve performance if your text-field only accepts characters of a certain byte-size (for example, ASCII).


Example #
A quick demonstration can be found in the example directory. To run the example:
flutter run example/main.dart