D11250: Expose presentation via MPRIS to rich remote controllers

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added a reviewer: Okular.
Restricted Application added a project: Okular.
kossebau requested review of this revision.

REVISION SUMMARY
  When going into presentation mode, a D-Bus object is created that
  implements MPRIS spec and exposes control to the presentation.
  By that any existing MPRIS controllers can be used next to the existing
  direct control by Okular UI itself.
  This includes e.g.
  
  - keyboard mediakeys (Play/Pause, Stop, Next, Previous), as handled by Plasma mpris dataengine
  - KDE Connect MPris plugin
  
  Motivation:
  For giving a presentation and not having to stand next to the computer
  which runs Okular, one can use wireless input controllers.
  Sometimes though one would like more rich remote controllers, e.g.
  with a display showing notes for the current page, giving a preview
  of the next/previous page, or allowing to jump to a page directly
  without everyone following on the big screen the search in the pages list.
  Such a rich remote controller could be done e.g. by an app for a mobile,
  which then connects to Okular.
  Instead of writing a custom controller app and designing a custom protocol,
  another option is to use the MPRIS spec and map the concepts of the
  Okular document and its pages onto the MPRIS tracklist and tracks.
  After all the "media player" in MPRIS is an abstraction, and to a good
  degree it is possible to make the Okular presentation mode an
  instantiation of it.
  While the current version 2 of MPRIS seems done rather with typical
  music players or movie players in mind, a future version shall also
  take presentation shows more into the design.
  This initial patch already enables simple Play/Pause/Next/Previous
  remote control, which is handy for remote controlling via KDE Connect.
  
  Future patches should also implement tracklist support, so a controller
  is e.g. able to show the complete list of tracks^Wpages as thumbnails.

TEST PLAN
  Load a document, enter presentation mode and see Okular appear in the
  KDE Connect Multimedia Remote Control, following commands or updating
  the states.

REPOSITORY
  R223 Okular

BRANCH
  addmprisservice

REVISION DETAIL
  https://phabricator.kde.org/D11250

AFFECTED FILES
  CMakeLists.txt
  mpris2/dbusabstractadaptor.cpp
  mpris2/dbusabstractadaptor.h
  mpris2/mpris2service.cpp
  mpris2/mpris2service.h
  mpris2/mprismediaplayer2.cpp
  mpris2/mprismediaplayer2.h
  mpris2/mprismediaplayer2player.cpp
  mpris2/mprismediaplayer2player.h
  ui/presentationwidget.cpp
  ui/presentationwidget.h

To: kossebau, #okular
Cc: #kde_connect, michaelweghorn, ngraham, aacid
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