[Libreoffice-bugs] [Bug 124505] Slide show using "All displays" presents a single slide show across all displays

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=124505

--- Comment #3 from AtesComp <atescomp at gmail.com> ---
@xiscofauli: Thanks for looking at this.  Yes and No.

The current documentation of the existing function says it "spans all
displays".  Originally, I believe it meant to present the slideshow
independently on each display (I could be wrong).  It attempts to span--display
a section of the slideshow on each display.  It should do like you are
suggesting: honor the actual monitor position.  Maybe it doesn't handle top to
bottom so well.  I didn't test that configuration.

However, as an enhancement, maybe two features should be implemented as
separate use cases:

1. Display as a single presentation spanning across all displays using the DE's
display manager settings to determine the placement of each section.  This
would probably be a significant undertaking as it requires finding/calculating
the overall virtual screen size, determine each monitor's pixel coverage based
on top to bottom and left to right orientation, sectional calculations to
determine what portion displays where while dealing with gaps (offsets) between
displays, and other issues.  It would be desirable to optionally hold one
display as the "presenter's display" (primary display, if there is a primary
display? or user selection) similar to the other options (see note below).

2. Display as multiple presentations on each individual display.  This should
be relatively simple to implement as it replicates the presentation on each
display.  It would also be desirable to optionally hold one display as the
"presenter's display".

NOTE: The other options select the displays a bit differently--Impress asks
which display is the "presentation display" as opposed to which display is the
"presenter's display" with the clock and notes.  Maybe it should ask for both
the "presenter's display" and the presentation display as per the above
options.

So maybe the UI should have:

--------------------
Multiple Displays:

[ ] Span presentation across displays

Presenter's Display:  Auto (selecting the main display or first display)
                      None
                      Display 1
                      ... (list all other displays)

Presentation Display: All (minus the presenter's display if selected;
                           this might be the only option if Span is on)
                      Auto (selecting the next--or first--display)
                      Display whatever
                      ... (list all other displays)
--------------------

Of course, if the DE has setup a "unified display" for multiple monitors, then
Impress should probably honor the setting as a single display.  This would be
like option 2 above (no span) with no "presenter's display".

One of the issues with using the system as currently implemented, is that when
you have a row of displays (say 3 or more) and a standard presentation, the
presentation is centered and the outer left and right portions are just black,
dead space (as it should be).  But, I also lose the presenter's display (I
might as well not use the "all" option).  With a rectangular array of monitors
and a presenter's display, this option could potentially be awesome.

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