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Currency formatter #17

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Currency formatter #17

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48 changes: 35 additions & 13 deletions example/lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -41,9 +41,10 @@ class MyHomePage extends StatelessWidget {
padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
isDense: true,
labelText: 'Integer Number'),
border: OutlineInputBorder(),
isDense: true,
labelText: 'Integer Number',
),
keyboardType: TextInputType.number,
inputFormatters: [
LengthLimitingTextInputFormatter(15),
Expand All @@ -56,9 +57,10 @@ class MyHomePage extends StatelessWidget {
padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
isDense: true,
labelText: 'Decimal Number'),
border: OutlineInputBorder(),
isDense: true,
labelText: 'Decimal Number',
),
keyboardType: TextInputType.number,
inputFormatters: [
LengthLimitingTextInputFormatter(15),
Expand All @@ -71,9 +73,10 @@ class MyHomePage extends StatelessWidget {
padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
isDense: true,
labelText: 'Card Number'),
border: OutlineInputBorder(),
isDense: true,
labelText: 'Card Number',
),
keyboardType: TextInputType.number,
inputFormatters: [
LengthLimitingTextInputFormatter(19),
Expand All @@ -86,17 +89,36 @@ class MyHomePage extends StatelessWidget {
padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
isDense: true,
hintText: 'dd/MM/yyyy'),
border: OutlineInputBorder(),
isDense: true,
hintText: 'dd/MM/yyyy',
),
keyboardType: TextInputType.number,
inputFormatters: [
FilteringTextInputFormatter.allow(RegExp(r'\d+|-|/')),
DateInputFormatter(),
],
style: TextStyle(fontSize: 16.0, color: Colors.black),
),
)
),
Padding(
padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
isDense: true,
labelText: 'Currency Number Format',
),
keyboardType: TextInputType.number,
inputFormatters: [
CurrencyFormatter(
locale: 'de_DE', // locale of country
symbol: '€', // symbol beside value
),
],
style: TextStyle(fontSize: 16.0, color: Colors.black),
),
),
],
),
),
Expand Down
74 changes: 74 additions & 0 deletions lib/currency_formatter.dart
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Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
import 'dart:math';

import 'package:flutter/services.dart';
import 'package:intl/intl.dart';

class CurrencyFormatter extends TextInputFormatter {
CurrencyFormatter({
this.locale,
this.name,
this.symbol,
this.isGrouped = false,
});

final String? locale;
final String? name;
final String? symbol;
final bool isGrouped;

@override
TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
final isInserted = oldValue.text.length + 1 == newValue.text.length && newValue.text.startsWith(oldValue.text);
final isRemoved = oldValue.text.length - 1 == newValue.text.length && oldValue.text.startsWith(newValue.text);

if (!isInserted && !isRemoved) {
return oldValue;
}

final format = NumberFormat.currency(
locale: locale,
name: name,
symbol: symbol,
);

if (isGrouped) {
format.turnOffGrouping();
}

final isNegativeValue = newValue.text.startsWith('-');
var newText = newValue.text.replaceAll(RegExp('[^0-9]'), '');

if (isRemoved && !_lastCharacterIsDigit(oldValue.text)) {
final length = newText.length - 1;
newText = newText.substring(0, length > 0 ? length : 0);
}

if (newText.trim() == '') {
return newValue.copyWith(
text: isNegativeValue ? '-' : '',
selection: TextSelection.collapsed(offset: isNegativeValue ? 1 : 0),
);
} else if (newText == '00' || newText == '000') {
return TextEditingValue(
text: isNegativeValue ? '-' : '',
selection: TextSelection.collapsed(offset: isNegativeValue ? 1 : 0),
);
}

num newInt = int.parse(newText);
if (format.decimalDigits! > 0) {
newInt /= pow(10, format.decimalDigits!);
}

final newString = (isNegativeValue ? '-' : '') + format.format(newInt).trim();
return TextEditingValue(
text: newString,
selection: TextSelection.collapsed(offset: newString.length),
);
}

static bool _lastCharacterIsDigit(String text) {
final lastChar = text.substring(text.length - 1);
return RegExp('[0-9]').hasMatch(lastChar);
}
}
1 change: 1 addition & 0 deletions lib/pattern_formatter.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -2,3 +2,4 @@ library pattern_input_formatter;

export 'numeric_formatter.dart';
export 'date_formatter.dart';
export 'currency_formatter.dart';