Perfectly center window title

[tuurep]

With

*.text.justify: center

in a theme, the title isn't centered on the whole width of the titlebar, but offset by buttons on the bar, like so:

I found a good lead about how this could maybe be changed:

https://github.com/helloSystem/ISO/issues/145#issuecomment-781527843

On modifying Openbox, a starting point can be changing in openbox/framerender.c framerender_label to call RrPaint with self->width instead of self->label_width.

Only changing self->label_width to self->width comes close, but is basically one character half a character width too far to the right:

Adding a sort of arbitrary self->width - 10 (px?) looks like it's very close:

So, looks like it's possible, but a couple issues:

• How to get the right width with no hardcoded pixel values?
• Truncated titles don't look good, a portion of it goes 'under' the window control buttons:

(window title is downloads)

self->label_width:

self->width:

It does still truncate, as can be seen with a longer title:

[tuurep]

framerender_label:

https://github.com/tuurep/openbox/blob/adb85c538962c15b496b90e79781eb7254c798cf/openbox/framerender.c#L351

self is an ObFrame struct, see here:

https://github.com/tuurep/openbox/blob/adb85c538962c15b496b90e79781eb7254c798cf/openbox/frame.h#L82

[tuurep]

basically half a character width too far to the right

• How to get the right width with no hardcoded pixel values?

Look into this:

https://github.com/tuurep/openbox/blob/adb85c538962c15b496b90e79781eb7254c798cf/obrender/render.h#L399

[tuurep]

Have to also consider there can be buttons or an app icon on the left side.

Probably best to approach this by first getting the title perfectly centered and then thinking about the truncation as a separate problem.