Window positioning

[Carsten Haitzler]

On Wed, 3 Jan 2018 13:23:49 +0000 "Han, Guowei"
<Guowei.Han at johnsonoutdoors.com> said:

> We are running a multi process application. And GUI is act as a transparent
> top layer. All other process rendering by them self underneath. So its
> important for other process to place the window at right potion.

Then you want to probably use process to process buffer sharing (e.g. like a
nested wayland compositor), and maybe subsurfaces. Then you have a main process
that acts as a gateway for other processes and their buffers and input etc. and
this process manages your policies within its window and relative positioning
space.

Never rely on the system compositor for this. What if the system compositor
didn't have a rectangular screen but displays on a globe? Or a hemisphere? Or
it wrapped the display around a 3d bunny rabbit? What if it was a compositor
for a mobile-like UI where it decided every app window is to be "fullscreen"
and mutually exclusive to other apps, displaying only 1 at a time? Relying on
and demanding global positioning files in the face of implementing man common
UI policies you see today across many devices. Wayland (and xdg-shell) are
designed to be as agnostic as possible to the final display policy and thus
limit things like positioning to only be subsurface based (relative to main
surface).

> Sent from my iPhone
> 
> On Jan 3, 2018, at 2:58 AM, Kai-Uwe
> <ku.b-list at gmx.de<mailto:ku.b-list at gmx.de>> wrote:
> 
> 
> Maybe you are after a full screen application then. With that you should be
> able to decide about the positioning on the whole output.
> 
> Am 03.01.2018 um 02:37 schrieb Han, Guowei:
> Thanks Jasper. Do u know if there's a demo i can learn from? Currently i am
> creating a bigger surface bigger than screen size. and make subsurface so i
> can posion them as i want. Really don't think its a good way to do it.
> 
> Sent from my iPhone
> 
> On Jan 2, 2018, at 4:25 PM, Jasper St. Pierre
> <jstpierre at mecheye.net<mailto:jstpierre at mecheye.net>> wrote:
> 
> *EXTERNAL EMAIL*
> 
> Hi Han,
> 
> You cannot position surfaces absolutely using the traditional xdg-shell
> protocol. However, for embedded cases, there are protocols like ivi-shell
> which provide that functionality.
> 
> On Fri, Dec 29, 2017 at 10:09 AM, Han, Guowei
> <Guowei.Han at johnsonoutdoors.com<mailto:Guowei.Han at johnsonoutdoors.com>>
> wrote: Hi,
> 
> Wonder if there’s a way we can position window to anywhere we want using
> wayland or maybe weston?
> 
> Thanks,
> 
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> 
> --
>   Jasper
> 
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-- 
------------- Codito, ergo sum - "I code, therefore I am" --------------
Carsten Haitzler - raster at rasterman.com