[Gambas-user] an observation on window placement with multiple screens

[Benoit Minisini]

Le 13/10/2022 à 17:44, Bruce Steers a écrit :
> 
> 
> On Thu, 13 Oct 2022 at 13:43, Benoit Minisini 
> <benoit.minisini at gambas-basic.org 
> <mailto:benoit.minisini at gambas-basic.org>> wrote:
> 
>     Le 13/10/2022 à 14:03, Bruce Steers a écrit :
>      > I want to handle it first hand, not after via save/restore a setting
>      > if i use Settings.Write(MyForm)
>      > It saves the window geometry and the screen number so i could
>     read the
>      > Form.Settings property but Benoit has stated this syntax may
>     change so
>      > it's not wise to use it.
>      > I've looked at the Screen class and there is no ID or Number
>     property to
>      > get data about the current screen.
>      >
>      > Can the Screens[] array Index be a reliable Id, so Screens[1] is
>     1 as
>      > the Form.Settings would save it?
>      >
>      > Can i tell what screen my open application is on?
>      > Then force other windows like Dialogs and Messages and widows
>     that have
>      > not had their position saved to be on the chosen screen?
>      >
>      > If not then i think gambas could really do with this feature.
>      > It was not my experience that all other applications behaved this
>     way.
>      > only some.
>      >
>      > Respects
>      > BruceS
>      >
> 
>     The problem are the following:
> 
>     - You can't directly specifiy the screen a window is. You can only
>     specify its position, and the screen is deduced from that position (all
>     screens making one sole big logical screen).
> 
>     - The window manager decides where a window appears. On X11, you can
>     suggest a position.
> 
>     - On Wayland, you can't specify a window position!
> 
>     So it's almost impossible to have a window opening intelligently
>     automatically in all cases. I will think a bit and see what I can do,
>     but I'm afraid that on Wayland we can't do anything.
> 
>     Regards,
> 
>     -- 
>     Benoît Minisini.
> 
> 
> I thought the "one big screen" was only relevant to virtual desktops not 
> physical displays/monitors?
> Virtual desktop positions is also pretty uncontrollable as you can get 
> window positions but they are relevant to the active window.
> So for an application that has a window on desktop 1 and 2 from desktop 
> 1 window positions for both windows are window 1 as normal and window 2 
> is it's position + screen width but if on desktop 2 window 2 is normal 
> and window 1 is position - screen width.
> That's a bit confusing but can be dealt with.
> 
> The problem though is you cannot re-open a window on another desktop as 
> you cannot set a screen position greater than a single screen width or 
> less than 0 so windows only ever open on the active desktop
> 
> So the problem here is not to do with virtual desktop screens as they in 
> fact do open windows on the relevant desktop.
> it's actual physical displays
> 
> Respects
> BruceS
> 

I don't see physical screens from the toolkits. I see only one big 
logical screen, with part of it associated with a screen number.

Regards,

-- 
Benoît Minisini.