From 925757ff5b1490759fbf453fe80fc930fcd2aa9e Mon Sep 17 00:00:00 2001
From: Gianluca Bettega <gian_bettega@hotmail.com>
Date: Wed, 26 Jun 2024 22:30:50 -0300
Subject: [PATCH] 4.12.0 - min value

---
 CHANGELOG.md                      |  3 +++
 lib/currency_textfield.dart       | 31 +++++++++++++++++++++++++++++++
 pubspec.yaml                      |  2 +-
 test/currency_textfield_test.dart | 22 ++++++++++++++++++++++
 4 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21866b3..d101c34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## [4.12.0] - 2024-06-26
+- Added `minValue` property to the controller. Now it is possible to define the minimum value the user is allowed to input. Everything lower than that will be forced to the minimum value.
+
 ## [4.11.0] - 2024-06-07
 - Added `forceCursorToEnd` parameter: now you can define if the controller will always force the user to input the numbers on the end of the string.
 - Fixed If enableNegative + showZeroValue properties are true, then negative #s cannot be entered! [22](https://github.com/IsaiasSantana/currency_textfield/issues/22).
diff --git a/lib/currency_textfield.dart b/lib/currency_textfield.dart
index 6f12651..438fc33 100644
--- a/lib/currency_textfield.dart
+++ b/lib/currency_textfield.dart
@@ -50,6 +50,10 @@ import 'dart:math';
 ///
 /// Default: `null`
 ///
+/// `minValue` lets you define the minimum allowed value of the controller.
+///
+/// Default: `null`
+///
 /// `startWithSeparator` lets you define if the controller starts with decimals activated.
 ///
 /// Default: `true`
@@ -76,6 +80,7 @@ class CurrencyTextFieldController extends TextEditingController {
   String _previewsText = '';
   double _value = 0.0;
   double? _maxValue;
+  double? _minValue;
   bool _isNegative = false;
   late bool _startWithSeparator;
 
@@ -120,6 +125,7 @@ class CurrencyTextFieldController extends TextEditingController {
     bool currencyOnLeft = true,
     bool enableNegative = true,
     double? maxValue,
+    double? minValue,
     bool startWithSeparator = true,
     bool showZeroValue = false,
     bool forceCursorToEnd = true,
@@ -136,6 +142,7 @@ class CurrencyTextFieldController extends TextEditingController {
         _currencyOnLeft = currencyOnLeft,
         _enableNegative = enableNegative,
         _maxValue = maxValue,
+        _minValue = minValue,
         _startWithSeparator = startWithSeparator,
         _resetSeparator = !startWithSeparator,
         _showZeroValue = showZeroValue,
@@ -228,6 +235,8 @@ class CurrencyTextFieldController extends TextEditingController {
   }
 
   void _updateValue() {
+    _checkMinValue();
+
     if (_value < 0) {
       if (!_enableNegative) {
         _value = _value * -1;
@@ -251,6 +260,15 @@ class CurrencyTextFieldController extends TextEditingController {
     }
   }
 
+  ///function to check if the value is lower than minValue.
+  void _checkMinValue() {
+    if (_minValue != null) {
+      if (_value < _minValue!) {
+        _value = _minValue!;
+      }
+    }
+  }
+
   ///function to replace current maxValue.
   void replaceMaxValue(double newMaxvalue, {bool resetValue = false}) {
     _maxValue = newMaxvalue;
@@ -264,6 +282,19 @@ class CurrencyTextFieldController extends TextEditingController {
     _changeText();
   }
 
+  ///function to replace current minValue.
+  void replaceMinValue(double newMinvalue, {bool resetValue = false}) {
+    _minValue = newMinvalue;
+
+    if (resetValue) {
+      _value = 0;
+    } else {
+      _checkMinValue();
+    }
+
+    _changeText();
+  }
+
   ///check if the value is negative.
   bool checkNegative() {
     if (_enableNegative) {
diff --git a/pubspec.yaml b/pubspec.yaml
index a588c24..0971bcb 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: 4.11.0
+version: 4.12.0
 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 f702e10..8df2c89 100644
--- a/test/currency_textfield_test.dart
+++ b/test/currency_textfield_test.dart
@@ -205,4 +205,26 @@ void main() {
     controller.text = "R\$ 7,00-";
     expect(controller.text, "R\$ 7,00");
   });
+
+  test('minValue', () {
+    final controller =
+        CurrencyTextFieldController(initDoubleValue: 300, minValue: 200);
+    final controller2 =
+        CurrencyTextFieldController(initDoubleValue: 100, minValue: 200);
+
+    controller.forceValue(initDoubleValue: 100);
+    expect(controller.textWithoutCurrencySymbol, '200,00');
+    expect(controller2.textWithoutCurrencySymbol, '200,00');
+  });
+
+  test('replace_minValue', () {
+    final controller =
+        CurrencyTextFieldController(initDoubleValue: 300, minValue: 200);
+
+    controller.forceValue(initDoubleValue: 100);
+    expect(controller.textWithoutCurrencySymbol, '200,00');
+    controller.replaceMinValue(0);
+    controller.forceValue(initDoubleValue: 50);
+    expect(controller.textWithoutCurrencySymbol, '50,00');
+  });
 }