From 109dfd6cd5a839644a184ab816951bfce4dd0c6b Mon Sep 17 00:00:00 2001
From: Giao Ho <joutvhu@gmail.com>
Date: Sat, 22 Apr 2023 20:09:11 +0700
Subject: [PATCH] Allow disable fix number.

---
 CHANGELOG.md                               | 17 ++++----
 lib/src/filter.dart                        | 43 ++++++++++---------
 lib/src/formatter.dart                     |  5 +++
 pubspec.yaml                               |  2 +-
 test/number_text_input_formatter_test.dart | 48 ++++++++++++++++++++++
 5 files changed, 88 insertions(+), 27 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4bb14fd..b9e7b06 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,17 +1,20 @@
-## 1.0.0
+## 1.0.0+4
 
-- Initial library
-- Support NumberTextInputFormatter, CurrencyTextInputFormatter and PercentageTextInputFormatter.
+- Allow disable fix number.
 
-## 1.0.0+1
+## 1.0.0+3
 
-- Check isNotEmpty before insert prefix or suffix.
+- Fix maxDecimal issue.
 
 ## 1.0.0+2
 
 - Fix maxValue issue.
 
+## 1.0.0+1
 
-## 1.0.0+3
+- Check isNotEmpty before insert prefix or suffix.
 
-- Fix maxDecimal issue.
+## 1.0.0
+
+- Initial library
+- Support NumberTextInputFormatter, CurrencyTextInputFormatter and PercentageTextInputFormatter.
diff --git a/lib/src/filter.dart b/lib/src/filter.dart
index 56a08f6..6c99a45 100644
--- a/lib/src/filter.dart
+++ b/lib/src/filter.dart
@@ -75,7 +75,6 @@ class TextNumberFilter {
 
   TextValueEditor filter() {
     editor.forEach(filterNext, filterComplete);
-    afterFilter();
     return editor;
   }
 
@@ -118,9 +117,20 @@ class TextNumberFilter {
       state.remove(startPosition, length);
     }
 
-    if (hasNumber && integerDigits == 0) {
-      integerDigits = 1;
-      state.prefix('0');
+    insertIntegerDigits();
+
+    if (editor.isNotEmpty) {
+      if (decimalPoint != null) {
+        if (decimalDigits == 0) {
+          insertDecimalDigits();
+        }
+      } else {
+        if (hasDecimalPoint) {
+          insertDecimalPoint();
+        }
+      }
+
+      groupDigits();
     }
   }
 
@@ -174,8 +184,10 @@ class TextNumberFilter {
         if (!allowing && startPosition < state.index) {
           state.remove(startPosition, state.index);
         }
-        state.prefix('0');
-        integerDigits = 1;
+        if (options.fixNumber) {
+          state.prefix('0');
+          integerDigits = 1;
+        }
         allowing = true;
         startPosition = state.index;
       }
@@ -254,25 +266,18 @@ class TextNumberFilter {
     return allow;
   }
 
-  void afterFilter() {
-    if (editor.isNotEmpty) {
-      if (decimalPoint != null) {
-        if (decimalDigits == 0) {
-          insertDecimalDigits();
-        }
-      } else {
-        if (hasDecimalPoint) {
-          insertDecimalPoint();
-        }
+  void insertIntegerDigits() {
+    if ((decimalPoint != null || hasNumber) && integerDigits == 0) {
+      if (!removing && options.fixNumber) {
+        integerDigits = 1;
+        editor.prefix('0');
       }
-
-      groupDigits();
     }
   }
 
   void insertDecimalDigits() {
     decimalPoint ??= editor.length - 1;
-    if (!removing) {
+    if (!removing && (options.fixNumber || options.insertDecimalDigits)) {
       decimalDigits = options.decimalDigits ?? 1;
       editor.suffix('0' * decimalDigits);
     }
diff --git a/lib/src/formatter.dart b/lib/src/formatter.dart
index e1db974..cb2e54e 100644
--- a/lib/src/formatter.dart
+++ b/lib/src/formatter.dart
@@ -31,6 +31,10 @@ class NumberTextInputFormatter extends TextInputFormatter {
   /// Allow input of negative numbers?
   final bool allowNegative;
 
+  /// Insert 0 before the decimal point if the number starts with a decimal point
+  /// Insert 0 after the decimal point if the number ends with a decimal point
+  final bool fixNumber;
+
   /// Automatically insert decimal point.
   final bool insertDecimalPoint;
 
@@ -57,6 +61,7 @@ class NumberTextInputFormatter extends TextInputFormatter {
     this.groupSeparator = ',',
     this.allowNegative = false,
     this.overrideDecimalPoint = false,
+    this.fixNumber = true,
     this.insertDecimalPoint = false,
     this.insertDecimalDigits = false,
   })  : assert(integerDigits == null || integerDigits > 0),
diff --git a/pubspec.yaml b/pubspec.yaml
index 3759e71..9084402 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: number_text_input_formatter
 description: Number Text Input Formatter for Flutter
-version: 1.0.0+3
+version: 1.0.0+4
 
 homepage: https://github.com/joutvhu/number_text_input_formatter
 repository: https://github.com/joutvhu/number_text_input_formatter.git
diff --git a/test/number_text_input_formatter_test.dart b/test/number_text_input_formatter_test.dart
index efd2834..0202116 100644
--- a/test/number_text_input_formatter_test.dart
+++ b/test/number_text_input_formatter_test.dart
@@ -755,6 +755,22 @@ void main() {
     expect(result.text, '804583.60');
   });
 
+  test('override_decimal_point_10', () {
+    var result = NumberTextInputFormatter(
+      integerDigits: 2,
+      decimalDigits: 2,
+      insertDecimalPoint: true,
+    ).formatEditUpdate(
+      const TextEditingValue(
+        text: '',
+      ),
+      const TextEditingValue(
+        text: '58',
+      ),
+    );
+    expect(result.text, '0.58');
+  });
+
   test('filter_other_decimal_point_1', () {
     var result = NumberTextInputFormatter(
       integerDigits: 13,
@@ -787,6 +803,38 @@ void main() {
     expect(result.text, '3.66');
   });
 
+  test('filter_fix_number_1', () {
+    var result = NumberTextInputFormatter(
+      integerDigits: 12,
+      groupDigits: 3,
+      fixNumber: false
+    ).formatEditUpdate(
+      const TextEditingValue(
+        text: '11',
+      ),
+      const TextEditingValue(
+        text: '11.',
+      ),
+    );
+    expect(result.text, '11.');
+  });
+
+  test('filter_fix_number_2', () {
+    var result = NumberTextInputFormatter(
+        integerDigits: 12,
+        groupDigits: 3,
+        fixNumber: false
+    ).formatEditUpdate(
+      const TextEditingValue(
+        text: '11',
+      ),
+      const TextEditingValue(
+        text: '.11',
+      ),
+    );
+    expect(result.text, '.11');
+  });
+
   test('currency_text_input_formatter_1', () {
     var result = CurrencyTextInputFormatter(
       prefix: '\$'