D11021: [Media contoller] Add simple volume control

[Radek Hušek]

Pitel added a comment.


  The idea crossed my mind but I rarely use expanded version of the applet and there are two problems to deal with:
  
  - Where exactly to place the slider (I am bad at designing UI).
  - What should upper bound of slider be -- usually 1 is good option but mpris does not prevent apps from using larger volumes and there is not "getMaxVolume" method / property. It might be possible to just hardcode 1 as max but care would be needed not to mess the volume up if it was set to (say) 1.5 by other means. (And the user experience would be somewhat inconsistent, but I am not sure how many apps really uses volume > 1.)
  
  So I decided to keep it simple at first try.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D11021

To: Pitel, #plasma
Cc: nicolasfella, plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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