Window manager capabilities
lazarus / 66-Unix

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MarkMLl · 2022-07-04 12:55

Following on from a comment which touched on different DPI settings
etc., is there any way of getting a complete list of exported
capabilities and hints from the current window manager (aka desktop
environment)?

I'm aware of e.g. https://specifications.freedesktop.org/wm-spec/wm-
spec-latest.html but I know that there are additional things like font
metrics which are passed from the WM: I don't know /how/ they're
passed but I've seen a program's layout behave grossly differently on
different WMs (refused to minimise beyond a certain point) which the
developers involved attributed to a missing hint or metric.

Of course, they couldn't agree who should be fixing it...

MarkMLl

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codic124 · 2022-09-05 19:27

Font metrics are usually not passed on from the WM at all, although
they might be from other parts of a desktop environment. If by
minimize you mean resize/shrink, it is because the programs set a
minimum size (eg via the ICCCM property WM_NORMAL_HINTS) which wms
might choose to honor in different ways.

(assuming x11, of course)

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MarkMLl · 2022-09-05 19:57

See https://github.com/Ultimaker/Cura/issues/10988 and https://forums.
raspberrypi.com/viewtopic.php?p=1946554&sid=fe3368394b4b90e14aacb0ee61
fe43c4#p1946554

The app (Cura) was behaving differently depending on the X11 WM
running on the computer, and the developers implicated QFontMetrics.

Therefore there /are/ metrics passed by the WM, but I don't know the
mechanism: I suspect ICCCM-related.

MarkMLl