Hallo,

As far as I understand, all objects must be on a page, per the PDF spec. 
They don't have to be visible on the page, and they will not be rendered 
if they are outside the bounds (i.e. off the page), but each page is 
rendered by itself.  Part of the reason the logic is in place is to ensure 
small devices which have limited resources (telephones, tablets, embedded 
devices, etc.) can still handle PDFs which are hundreds, or thousands of 
pages.  This way if someone goes to page 97 in a PDF, the software only 
has to read in objects which are associated with that page.  So I don't 
think this is a limitation of PDFBox, but rather a limitation of the PDF 
file format itself (and not so much of a limitation as it is a design 
decision).

However, I've never worked with layers specifically, so there could be 
some exception made for those objects.

---- 
Thanks,
Adam



From:
"Friedrich, Christian (EXT)" <[email protected]>
To:
"[email protected]" <[email protected]>
Date:
04/15/2011 01:41
Subject:
PDOptionalContentGroup and Layers



Hi,

currently I'm working on a tool for highlighting text in a PDF document. I 
mark different topics in the text with different colors. Therfore I want 
to use each one layer of the PDF for one color.
I managed to create the layers using the LayerUtility class. This works 
fine for single pages. But it is not useful for me that a layer always 
refers to only one page.I would like to define a layer for the entire 
document (or at least a collection of pages), so that the user can 
activate or deactivate a layer for the entrie document and not for each 
page individually.

Does PDFBox offer the functionality to create layers which do not only 
refer to one single page? If yes, which class provides it?

Thanks!



Regards
Christian Friedrich

Forschungszentrum Informatik
Externer Dienstleister der Siemens AG
Corporate Technology
CT T DE TC2
Otto-Hahn-Ring 6
81739 München, Deutschland
Tel.: +49 (89) 636-32801
mailto:[email protected]

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