Configurable barcode

[ebruchez]

The barcode feature is currently only supported with PDF templates. Also, the barcode only supports encoding the document id. This issue addresses the following improvements:

• support the barcode in automatic PDF mode
• configurable
  • value
    • via an expression which has access to form data and metadata
    • similar to oxf.fr.detail.pdf.filename
  • position
  • orientation
  • size

Suggested properties:

• oxf.fr.detail.pdf.barcode.value: XPath expression
• oxf.fr.detail.pdf.barcode.position
  • something like top/right/bottom/left as in CSS?
  • in what units?
• oxf.fr.detail.pdf.barcode.orientation: horizontal | vertical
• oxf.fr.detail.pdf.barcode.scale: xs:double

We do have a barcode processor which can generate an image. This would have to be reworked a bit (there is a version 2.1 from 2010 available), and the image must be accessible from oxf:xhtml-to-pdf, either via an added <img> or via CSS.

Another option, which might be better: use iText to embed the barcode in both PDF modes.

Tasks:

• evaluate if can use iText barcode in both modes
  • see also this SO question
• figure out where to run the XPath expression
  • must be in the context of the form data, so in XForms
  • probably output value as a hidden <span> in the HTML so it is accessible by the PDF processors
• figure out how to hook up position, orientation and scale
  • maybe <span class="fr-barcode fr-barcode-vertical" style="left: 100px; bottom: 50px; width: 500px">
  • OR via iText
• allow setting the text below the barcode as well
• support for PDF template for consistency
• doc
• enable by default on at least one demo form (Enable barcode by default for demo purposes #1008)
• remove old barcode processor if unused

+1 from customer

[avernet]

+1 from customer to make the value encoded by the barcode configurable