23 lines
659 B
Dart
23 lines
659 B
Dart
import 'package:flutter/services.dart';
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class TextField4SpaceFormatter extends TextInputFormatter {
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@override
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TextEditingValue formatEditUpdate(
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TextEditingValue oldValue,
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TextEditingValue newValue,
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) {
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final text = newValue.text.replaceAll(' ', '');
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final buffer = StringBuffer();
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for (int i = 0; i < text.length; i++) {
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buffer.write(text[i]);
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if ((i + 1) % 4 == 0 && i + 1 != text.length) {
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buffer.write(' ');
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}
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}
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final formattedText = buffer.toString();
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return newValue.copyWith(
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text: formattedText,
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selection: TextSelection.collapsed(offset: formattedText.length),
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);
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}
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} |