barcode method

List<int> barcode(Barcode barcode, { int? width, int? height, BarcodeFont? font, BarcodeText textPos = BarcodeText.below, PosAlign align = PosAlign.center, })

Print a barcode

width range and units are different depending on the printer model (some printers use 1..5). height range: 1 - 255. The units depend on the printer model. Width, height, font, text position settings are effective until performing of ESC @, reset or power-off.

Implementation

List<int> barcode(
  Barcode barcode, {
  int? width,
  int? height,
  BarcodeFont? font,
  BarcodeText textPos = BarcodeText.below,
  PosAlign align = PosAlign.center,
}) {
  List<int> bytes = [];
  // Set alignment
  bytes += setStyles(PosStyles().copyWith(align: align));

  // Set text position
  bytes += cBarcodeSelectPos.codeUnits + [textPos.value];

  // Set font
  if (font != null) {
    bytes += cBarcodeSelectFont.codeUnits + [font.value];
  }

  // Set width
  if (width != null && width >= 0) {
    bytes += cBarcodeSetW.codeUnits + [width];
  }
  // Set height
  if (height != null && height >= 1 && height <= 255) {
    bytes += cBarcodeSetH.codeUnits + [height];
  }

  // Print barcode
  final header = cBarcodePrint.codeUnits + [barcode.type.value];
  if (barcode.type.value <= 6) {
    // Function A
    bytes += header + barcode.data + [0];
  } else {
    // Function B
    bytes += header + [barcode.data.length] + barcode.data;
  }
  return bytes;
}