[Libreoffice-ux-advise] [Bug 99513] Multi-page view options not available in Draw

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=99513

V Stuart Foote <vstuart.foote at utsa.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #6 from V Stuart Foote <vstuart.foote at utsa.edu> ---
(In reply to Gianfranco Cecconi from comment #5)
> ...
> The hybrid PDF+ODG option V Stuart Foote talks about is very interesting, I
> did not know about it. It is not clear from the help pages, however, how to
> tell LibreOffice to re-open the hybrid PDF to take advantage of that.
> Perhaps nothing is needed, and it's intentional.

That is correct a LibreOffice generated Hybrid PDF simply opens back to the
LibreOffice module that exported it.

LibreOffice can not edit PDF! All we do is import PDF into any one of the LO
modules with filters--Draw pages by default, Impress slides, or Writer text
documents [1].

The LibreOffice "Hybrid PDF" format is a non-standard PDF hack. Basically when
exporting to PDF we extend the PDF's container and embed a copy of the ODF
document archive. That can be an original spreadsheet from Calc, or a text
document from Writer, or a single page graphic from Draw. Or, even a Draw
document containing a multipage PDF import as you've found. Unfortunately no
Math formulas.

In all cases--the export to PDF is done with our normal filter process. The
only difference in the "Hybrid PDF" is appending the ODF archive (the document
is saved to tmp in the process and then exported). PDF parsers other than
LibreOffice will open the "Hybrid PDF", but ignore the extended ODF
archive--they don't know what to do with it.

But when LibreOffice again opens the "Hybrid PDF" archive it will detect the
included ODF archive and rather than flushing the PDF back though the import
filters will instead *reopen the ODF document* in the module as it was added.

The intent for the project was to provide the source ODF document with the
resulting PDF. Not to be able to directly edit the PDF but to allow the PDF to
be *regenerated* after changes are made to the ODF document.

The "problem" with the Hybrid PDF is that other programs *can* change the PDF
content--but would make no change to the contained ODF, and when a LibreOffice
user again opens the PDF they'd not see any changes made but only the original
ODF.

So, use with caution--if it works for you great, caveat emptor.

As to changing the Draw or Impress canvas to support a multipage/multislide
editing mode--it is not impossible, but would likely require a lot of dev
effort to refactor.  I simply don't believe it is necessary in the general use
case for LibreOffice. 

=-note-=
[1] To expose import filters other than to Draw, you need to set use of the
LibreOffice dialogs from Tools -> Options -> General: Open/Save dialogs.
Choosing the file type sets the import filter used when opening the PDF.

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