Re: master fe7c015b20: Support XFCE in wallpaper.el

[Stephen Berman <stephen.berman@gmx.net>]

On Mon, 26 Sep 2022 15:42:51 -0400 Stefan Kangas <stefankangas@gmail.com> wrote:

> Po Lu <luangruo@yahoo.com> writes:
>
>> The screen number should be the following part of the `display' frame
>> parameter:
>>
>>   1.1.1.1:0.5
>>             ^ screen number is 5
>>
>> if there is no period after the separator, then the screen number is 0.
>>
>> The currently active workspace can be obtained like so:
>>
>>   (x-window-property "_NET_CURRENT_DESKTOP" nil "CARDINAL" 0 nil t)
>>
>> if it fails by returning NULL, then you should fall back to:
>>
>>   (x-window-property "WIN_WORKSPACE" nil "CARDINAL" 0 nil t)
>>
>> and failing that, 0.
>>
>> The monitor name should also be easy to extract with
>> display-monitor-attributes-list, but if the source is anything other
>> than "XRandr", "XRandr 1.5" or "Gdk", you should fall back to using "0".
>
> Thanks, I've pushed a fix to master based on the above.  I very much
> appreciated the clear instructions above, which saved me a ton of time.
>
> I had to jump through extra hoops to get it to work also in the
> situation that Thierry described, however.  See commit b0289e7f6d and in
> particular bb9df76dc9.
>
> I installed XFCE on my machine to test the change and it works for me.
> If someone with XFCE could test that the change works for them, that
> would be welcome.

It does not work for me.  display-monitor-attributes-list identifies my
monitor as "HDMI2", which is of course not one of the stipulated
sources.  After commenting out

(if (and monitor (member source '("XRandr" "XRandr 1.5" "Gdk")))
    monitor
  "0")

in wallpaper--format-arg and using "HDMI2" for the monitor, then
wallpaper-default-set-function produces a command that does change the
wallpaper.

In case it matters, my xfconf-query version is 4.16.0.

Steve Berman