printLines static method

Future<bool> printLines(List<String> lines, { String fontFamily = 'Siemreap', double fontSize = 20, FontWeight fontWeight = FontWeight.normal, double lineSpacing = 1.5, })

Print multiple lines of text.

Prints a list of text lines with the specified formatting.

• lines: List of text lines to print
• fontFamily: Font family to use
• fontSize: Font size in points
• fontWeight: Font weight (normal, bold, etc.)
• lineSpacing: Spacing between lines

Returns true if printing was successful.

Implementation

static Future<bool> printLines(
  List<String> lines, {
  String fontFamily = 'Siemreap',
  double fontSize = 20,
  FontWeight fontWeight = FontWeight.normal,
  double lineSpacing = 1.5,
}) async {
  if (lines.isEmpty) return true;

  // Combine lines with newlines and proper spacing
  final text = lines.join('\n');

  // Check if we can print directly using ASCII
  if (TextFormatter.isAsciiPrintable(text)) {
    return await printText(text);
  } else {
    // We need to render as image if text contains non-ASCII characters
    // This implementation would create an image with the text and print it
    try {
      final directory = await getTemporaryDirectory();
      final tempPath =
          '${directory.path}/lines_${DateTime.now().millisecondsSinceEpoch}.png';

      // Create recorder and canvas
      final recorder = PictureRecorder();
      final canvas = Canvas(recorder);

      // Calculate total height
      double totalHeight = 0;
      List<TextPainter> painters = [];

      for (String line in lines) {
        final textSpan = TextSpan(
          text: line,
          style: TextStyle(
            fontFamily: fontFamily,
            fontSize: fontSize,
            fontWeight: fontWeight,
            color: Colors.black,
          ),
        );

        final textPainter = TextPainter(
          text: textSpan,
          textDirection: TextDirection.ltr,
        );

        textPainter.layout(maxWidth: 576);
        painters.add(textPainter);
        totalHeight += textPainter.height * lineSpacing;
      }

      // Draw white background
      canvas.drawRect(
        Rect.fromLTWH(0, 0, 576, totalHeight),
        Paint()..color = Colors.white,
      );

      // Draw text lines
      double yPos = 0;
      for (TextPainter painter in painters) {
        painter.paint(canvas, Offset(0, yPos));
        yPos += painter.height * lineSpacing;
      }

      // Convert to image
      final picture = recorder.endRecording();
      final img = await picture.toImage(576, totalHeight.ceil());
      final byteData = await img.toByteData(format: ImageByteFormat.png);
      final buffer = byteData!.buffer.asUint8List();

      // Save to temp file
      await File(tempPath).writeAsBytes(buffer);

      // Print the image
      return await PrinterCore.printImage(tempPath);
    } catch (e) {
      print('Error printing lines: $e');
      return false;
    }
  }
}