Notes from "New OSD in Plasma 2"

[Martin Graesslin]

On Saturday 18 January 2014 12:53:10 Martin Klapetek wrote:
> On Sat, Jan 18, 2014 at 12:25 PM, Martin Graesslin 
<mgraesslin at kde.org>wrote:
> > On Monday 13 January 2014 18:46:28 Martin Klapetek wrote:
> > > Hey all,
> > > 
> > > following are the notes from the "New OSD in Plasma 2" discussion we had
> > > here at the Plasma sprint.
> > > 
> > > The basic idea is that the shell should provide a way for certain apps
> > > to
> > > display a short passive transient notification. That includes things
> > > like
> > > when user changes brightness, volume, changes the keyboard layout,
> > 
> > virtual
> > 
> > > desktop or activity and possibly few others.
> > > 
> > > This would be handled over DBus with custom QML files doing the
> > 
> > rendering.
> > 
> > > The flow is as follows: user changes volume - kmix sends a dbus signal -
> > > plasma has a slot handling that signal - plasma loads the QML file for
> > > rendering and puts it on screen with special window class - kwin gives
> > > it
> > > extra love cause of the win class.
> > 
> > I had some thought on the "KWin gives it extra love" and how we can
> > identify
> > the window. The preferred way on my side would be a window type and there
> > is
> > one existing type which we might reuse: _NET_WM_WINDOW_TYPE_NOTIFICATION
> > [1].
> > We have complete support for it in KWin and KWindowsystem as
> > NET::Notification
> > in NET::WindowTypes enum. KWin recognizes the notification and does
> > nothing
> > with it [2]. To be more precise KWin does not support the window type for
> > managed windows, only for override redirect windows. That's easy to
> > change,
> > though.
> 
> Who should do the positioning? Plasma or KWin?

I don't care, but I would say Plasma. I think that simplifies it given that you 
have to set x/y anyway.

> Truth is you don't need to know the /exact/ brightness or volume level in
> fullscreen video, you simply fiddle with it until it suits you. In this
> case it's maybe not as much about showing the exact percentage, but about
> providing visual feedback that you hit the correct keys and that they are
> working - I can imagine cases where users will press it couple times more
> to actually check if the brightness controls do work.

The main problem I used to have is when powerdevil changes the brightness, 
especially when e.g. a TV is connected to the system. Kind of useless then.

> 
> Changing the layer order would be easy afterwards right? I guess we could
> try your proposal and see how it works in practice.

Yes, that would be very easy.

Cheers
Martin
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