how to set height of page size to auto?

[vonchristian]

Im using prawn to generate receipts and the height of the page is unknown because it depends on how many items a customer purchases.

[pointlessone]

Hi @vonchristian,

I'm afraid there's no way to set 'auto' for a page height. PDF's main use case is a paged documents.

As a workaround I can suggest you setting a really big height for your page, laying out everything you want to wit in, recording the amount of space it took, manipulate page object to reflect the size. I can't give you the exact instructions for how to do that of top of my head. I just ccan tell you that you probably would need to get pretty deep into PDF::Core guts.

[gettalong]

Just what I wanted to post 😄 - so here it goes:

You could probably use a a very large height for your document so that prawn doesn't automatically create a new one. And once you are finished with everything, use Prawn::Document#y to determine your current vertical position.

Then you can use Prawn::Document#page (a PDF::Core::Page object) to adjust the MediaBox for the page, something like:

require 'prawn'

Prawn::Document.generate("test.pdf", page_size: [100, 2000], margin: 10) do |doc|
  rand(100).times do
    doc.text("some text")
  end
  doc.page.dictionary.data[:MediaBox] = [0, doc.y - 10, 100, 2000]
end

[pointlessone]

@gettalong Thanks! It turned out much simpler than I anticipated. 😅

[pointlessone]

@vonchristian I will close this issue now. Feel free to reopen if you think this issue is not resolved for you.

[duarte171183]

Thank! in my case, i use class TicketPdf < Prawn::Document and the solution is self.page.dictionary.data[:MediaBox] = [0, self.y - 10, 350, 2000] in the method initialize.

[halo]

Thank you, works splendidly!

Any suggestions on how to determine the width (right-most x of the content)? In the examples above it has been hard-coded.

I don't think I can do this with PDF::Inspector in a simple way.