[SOLVED] Re: Openbox and multiple screens.

[peter@easthope.ca]

Hello Davidson,  thanks for the reply.

    From: davidson <davidson@freevolt.org>
    Date: Mon, 18 Apr 2022 23:07:28 +0000 (UTC)
>  $ man 7 X
> ...
> ... -geometry WIDTHxHEIGHT+XOFF+YOFF ...

This line in ~/.config/openbox/autostart starts firefox without recognition of geometry.
(sleep 3s && firefox -geometry 800x600+1000+20 ) &

https://linux.die.net/man/1/firefox doesn't mention geometry but 
suggested this.
(sleep 3s && xterm -e firefox -height 480 -width 640 ) &
Good, that works.

Google and a bit of luck led to this page
http://openbox.org/wiki/Help:Configuration#Applications 
and the link to this. 
http://openbox.org/wiki/Help:Applications

This command with a click on the target window is critical to 
identification of a window.
obxprop | grep "^_OB_APP"

This stanza puts the firefox window at the upper left of the right 
screen.
<application class="Firefox-esr">
  <position> <x>1300</x> <y>0</y> </position>
</application>

A window with these properties 
_OB_APP_GROUP_CLASS(UTF8_STRING) = 
_OB_APP_GROUP_NAME(UTF8_STRING) = 
_OB_APP_CLASS(UTF8_STRING) = 
_OB_APP_NAME(UTF8_STRING) = 
_OB_APP_ROLE(UTF8_STRING) = 
stumped me until recognizing that this stanza provides a default 
(matches any window) case.
<application class="*">
  <position> <x>10</x> <y>10</y> </position>
</application>

For now this is the complete applications stanza in 
/home/me/.config/openbox/rc.xml.

<applications>
# Default window location at the upper left of display coordinates.
<application class="*">
  <position> <x>10</x> <y>10</y> </position>
</application>

<application class="Firefox-esr">
  <position> <x>1300</x> <y>0</y> </position>
</application>

</applications>

There might be a way to include window height and width in rc.xml but 
I'm content to leave them in /home/me/.config/openbox/autostart for 
now.

    From: davidson <davidson@freevolt.org>
    Date: Mon, 18 Apr 2022 23:07:28 +0000 (UTC)
> As for which screen, see the section titled "DISPLAY NAMES" in the
> same manual.

Here display :0 spans the two screens.  One display coordinate system 
can be used directly as above.

Thanks again,                     ... P.

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