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login_mask.dart
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login_mask.dart
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// Flutter imports:
import 'package:flutter/services.dart';
class LoginMask extends TextInputFormatter {
final numberOfLetters = 2;
final maxCharacters = 8;
///Mask to match this regex "[A-Z]{2}[0-9]{5}"
///To use it add this mask to the inputFormatters in a TextField.
LoginMask();
@override
TextEditingValue formatEditUpdate(
TextEditingValue oldValue, TextEditingValue newValue) {
final int newTextLength = newValue.text.length;
final StringBuffer newText = StringBuffer();
if (newTextLength <= numberOfLetters &&
RegExp("[a-zA-Z]").hasMatch(newValue.text)) {
newText.write(newValue.text.toUpperCase());
}
if (newTextLength > numberOfLetters &&
RegExp("^[0-9]*\$")
.hasMatch(newValue.text.substring(2, newTextLength)) &&
newTextLength < maxCharacters) {
newText.write(newValue.text.toUpperCase());
} else if (newTextLength > numberOfLetters &&
newTextLength < maxCharacters) {
newText.write(newValue.text.substring(0, newTextLength - 1));
}
if (newTextLength >= maxCharacters) {
newText.write(newValue.text.substring(0, maxCharacters - 1));
}
return newValue.copyWith(
text: newText.toString(),
selection: TextSelection.collapsed(offset: newText.length),
);
}
}