Refactoring

example/blue/lib/main.dart

@@ -60,7 +60,7 @@ class _MyHomePageState extends State<MyHomePage> {
   void _testPrint(PrinterBluetooth printer) async {
     printerManager.selectPrinter(printer);
 
-    Ticket ticket = Ticket(PaperSize.mm58);
+    final Ticket ticket = Ticket(PaperSize.mm58);
 
     ticket.text(
         'Regular: aA bB cC dD eE fF gG hH iI jJ kK lL mM nN oO pP qQ rR sS tT uU vV wW xX yY zZ');

lib/src/ticket.dart

@@ -18,11 +18,13 @@ import 'pos_column.dart';
 import 'pos_styles.dart';
 
 class Ticket {
-  Ticket(this._paperSize);
+  Ticket(this._paperSize) {
+    reset();
+  }
 
   List<int> bytes = [];
   PosCodeTable _codeTable;
-  PaperSize _paperSize;
+  final PaperSize _paperSize;
 
   /// Set global code table which will be used instead of the default printer's code table
   void setGlobalCodeTable(PosCodeTable codeTable) {
@@ -35,7 +37,7 @@ class Ticket {
   }
 
   double _colIndToPosition(int colInd) {
-    int width = PaperSize.width(_paperSize);
+    final int width = PaperSize.width(_paperSize);
     return colInd == 0 ? 0 : (width * colInd / 11 - 1);
   }