How does tilda manage to set positions for multiple (extended) displays correctly?

[nspiller]

Hi,

the seamless looks of tilda are truly awesome. That's why I am trying to find a way to set the location of my tilda windows automatically depending on the monitor setup I am using.

I wrote a script that determines – via xrandr – which display is currently primary and writes the corresponding show_on_monitor, x_pos, y_pos, max_width and max_height in the tilda config to send tilda to a certain location on the primary screen – for example 10 % from the top and 20 % from the left.

This works great for a single monitor, but my current setup is laptop screen on the left (secondary) and big screen on the right (primary). The max_width and max_height are correct for me, but the x_pos and y_pos are apparently determined from the top left corner of the laptop (secondary) screen. The show_on_monitor setting has no effect on the origin of the coordinate system.

How does tilda know, that there is a secondary monitor to the left and that is has to take the relative position of that one into account?

Best, Nico

[nspiller]

I figured it out, the information was also given in xrandr for the primary display:

DP1 connected primary 2560x1440+1920+0 (normal left inverted right x axis y axis) 597mm x 336mm

In order to set the right coordinate system on the primary display, I had to use 2560 + 1920 for x_pos and 1440 + 0 for y_pos

I was using Cinnamon 3.6.7 (Gtk 3.18.9-1ubuntu3.3).