Re: Getting real size and position for arranged controls.

[Bruce Steers <bsteers4@xxxxxxxxx>]

On Sun, 26 Jan 2025, 16:00 Benoît Minisini, <
benoit.minisini@xxxxxxxxxxxxxxxx> wrote:

> Le 26/01/2025 à 16:19, Bruce Steers a écrit :
> >
> > Glad you figured it out Carlos :)
> >
> > I'll try to explain the wayland issue for anyone who's interested as
> > it's a rainy Sunday and I'm bored.....
> > The way to get your head around wayland is to think your application
> > window now opens in it's very own personal screen.
> > The compositor gives your program a space the size of your window.
> >
> > Unlike in X11 where your window is a smaller rectangle inside a larger
> > screen rectangle and the windows X and Y position can be moved to any
> > point inside the larger screen. Also Form.Move() works as expected.
> >
> > With Wayland your window is kind of fullscreen in it's own screen space.
> >  From the gambas programs view the screen is the size of your window and
> > the windows X and Y position is always 0, 0 (ish)
> > So GianLuigi is correct that there are wayland issues but i think they
> > are not really relevant to this suggested type of usage.
> > it's not quite as bad as "any code based on window position cannot work
> > in wayland"
> > In reality it ONLY negates code that wants to *move* the main window
> > inside the screen. that is not possible with wayland as explained.
> >
> > But for most code working "inside" the application area, for example...
> > ' find an objects position in the form using Form.ScreenX and
> > Control.ScreenX values...
> > Dim iXPos As Integer = hControl.ScreenX - hControl.Window.ScreenX
> >
> > There is no real difference in the outcome.
> > "for the most part" usage of ScreenX/ScreenY values work just as well
> > with wayland as X11, the difference/offset is handled internally.
> >
> > Only when it comes to top-level window movement or reading top-level
> > window positions () will you find Form.ScreenX/.ScreenY properties not
> > making sense in wayland as the "screen" as we know it is not the same.
> >
> > Otherwise it's probably code that will still work as expected :)
> >
> > I hope that made sense :)
> >
> > Respects
> > BruceS
> >
>
> It's a rather good presentation of the problem with windows coordinates
> in Wayland. I think there should be a Wayland page on the wiki with that
> kind of information.
>
> --
> Benoît Minisini.
>

I did add some info a while ago in the F.A.Q <http://F.AQ> on wiki.
https://gambaswiki.org/wiki/doc/faq#t13

But yes a full page dedicated to all the differences with wayland in detail
would be good.
I'll start something,
Where would you suggest to put the link to the page?

Respects
BruceS