Initial commit: Penyerahan final Source code Tugas Akhir

lib/screens/checkout/components/cardnumber.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+class CardNumberInputFormatter extends TextInputFormatter {
+  @override
+  TextEditingValue formatEditUpdate(
+      TextEditingValue oldValue, TextEditingValue newValue) {
+    var text = newValue.text;
+
+    if (newValue.selection.baseOffset == 0) {
+      return newValue;
+    }
+
+    var buffer = new StringBuffer();
+    for (int i = 0; i < text.length; i++) {
+      buffer.write(text[i]);
+      var nonZeroIndex = i + 1;
+      if (nonZeroIndex % 4 == 0 && nonZeroIndex != text.length) {
+        buffer.write('  '); // Add double spaces.
+      }
+    }
+
+    var string = buffer.toString();
+    return newValue.copyWith(
+        text: string,
+        selection: new TextSelection.collapsed(offset: string.length));
+  }
+}