From 2bf7a72abaa638c74f73c6b9fc5d40e80177783e Mon Sep 17 00:00:00 2001
From: Gianluca Bettega <gian_bettega@hotmail.com>
Date: Tue, 4 Jun 2024 09:50:37 -0300
Subject: [PATCH] 4.10.0

---
 CHANGELOG.md                      |  3 +++
 lib/currency_textfield.dart       | 27 +++++++++++++++------------
 pubspec.yaml                      |  2 +-
 test/currency_textfield_test.dart |  6 ++++--
 4 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f91f398..c458283 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## [4.10.0] - 2024-06-04
+- Added `showZeroValue` parameter: now you can define if the controller will show the 0 value.[19](https://github.com/IsaiasSantana/currency_textfield/issues/19)
+
 ## [4.9.1] - 2024-06-02
 - Fixed a bug that caused minus sign to not disappear when the value of the controller is 0.[18](https://github.com/IsaiasSantana/currency_textfield/issues/18).
 - Removed unnecessary call to the listener.
diff --git a/lib/currency_textfield.dart b/lib/currency_textfield.dart
index 08ccbfe..232840b 100644
--- a/lib/currency_textfield.dart
+++ b/lib/currency_textfield.dart
@@ -53,12 +53,16 @@ import 'dart:math';
 /// `startWithSeparator` lets you define if the controller starts with decimals activated.
 ///
 /// Default `true`
+/// 
+/// `showZeroValue` lets you define if the controller will show the 0 value.
+///
+/// Default `false`
 ///
 class CurrencyTextFieldController extends TextEditingController {
   final int _maxDigits, _numberOfDecimals;
   final String _decimalSymbol, _thousandSymbol, _currencySeparator;
   final bool _currencyOnLeft, _enableNegative, _resetSeparator;
-  final bool _allowZeroValue;
+  final bool _showZeroValue;
   final RegExp _onlyNumbersRegex = RegExp(r'[^\d]');
   late String _currencySymbol, _symbolSeparator;
 
@@ -110,7 +114,7 @@ class CurrencyTextFieldController extends TextEditingController {
     bool enableNegative = true,
     double? maxValue,
     bool startWithSeparator = true,
-    bool allowZeroValue = false,
+    bool showZeroValue = false,
   })  : assert(thousandSymbol != decimalSymbol,
             "thousandSymbol must be different from decimalSymbol."),
         assert(numberOfDecimals >= 0,
@@ -126,7 +130,7 @@ class CurrencyTextFieldController extends TextEditingController {
         _maxValue = maxValue,
         _startWithSeparator = startWithSeparator,
         _resetSeparator = !startWithSeparator,
-        _allowZeroValue = allowZeroValue {
+        _showZeroValue = showZeroValue {
     _changeSymbol();
     forceValue(initDoubleValue: initDoubleValue, initIntValue: initIntValue);
     addListener(_listener);
@@ -138,7 +142,7 @@ class CurrencyTextFieldController extends TextEditingController {
       return;
     }
 
-    if (!_allowZeroValue && text.isEmpty) {
+    if (text.isEmpty) {
       _zeroValue(resetText: false);
       return;
     }
@@ -163,7 +167,7 @@ class CurrencyTextFieldController extends TextEditingController {
       }
     }
 
-    if (!_allowZeroValue && (double.tryParse(clearText) ?? 0.0) == 0.0) {
+    if ((double.tryParse(clearText) ?? 0.0) == 0.0) {
       _zeroValue();
       return;
     }
@@ -260,8 +264,8 @@ class CurrencyTextFieldController extends TextEditingController {
   }
 
   void _changeText() {
-    if (_value == 0) {
-      _previewsText = _allowZeroValue ? _composeCurrency(_applyMaskTo(value: _value)) : '';
+    if (_value == 0 && !_showZeroValue) {
+      _previewsText = '';
     } else {
       _previewsText = _composeCurrency(_applyMaskTo(value: _value));
     }
@@ -283,12 +287,11 @@ class CurrencyTextFieldController extends TextEditingController {
   void _zeroValue({bool resetText = true}) {
     _value = 0;
     _isNegative = false;
-    _previewsText = '';
 
-    if (resetText) {
-      _previewsText = _allowZeroValue ? '0' : '';
-      text = _previewsText;
-      _setSelectionBy(offset: 0);
+    if (resetText || _showZeroValue) {
+      _changeText();
+    } else {
+      _previewsText = '';
     }
 
     if (_resetSeparator && _startWithSeparator) {
diff --git a/pubspec.yaml b/pubspec.yaml
index 1a6c65c..3628e9f 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: currency_textfield
 description: A flutter package that implements a Controller for currency text input.
-version: 4.9.1
+version: 4.10.0
 homepage: https://github.com/IsaiasSantana/currency_textfield
 environment:
   sdk: '>=3.0.0 <4.0.0'
diff --git a/test/currency_textfield_test.dart b/test/currency_textfield_test.dart
index de5e7e1..0845c97 100644
--- a/test/currency_textfield_test.dart
+++ b/test/currency_textfield_test.dart
@@ -182,14 +182,16 @@ void main() {
   });
 
   test('test_allowZeroValue_shoulDisplayZeroValueFormatted', () {
-    final controller = CurrencyTextFieldController(initIntValue: 0, allowZeroValue: true);
+    final controller = CurrencyTextFieldController(initIntValue: 0, showZeroValue: true);
 
     expect(controller.text, "R\$ 0,00");
   });
 
     test('test_allowZeroValue_whithoutInitialValue_shoulDisplayEmptyString', () {
-    final controller = CurrencyTextFieldController(allowZeroValue: true);
+    final controller = CurrencyTextFieldController(showZeroValue: true);
+    final controller2 = CurrencyTextFieldController(initIntValue: 0);
 
     expect(controller.text, '');
+    expect(controller2.text, '');
   });
 }