Getting display/workspace dimensions in a GNOME Shell extension

Question

I'm on Ubuntu 22.04 LTS using GNOME Shell 42.9. I've writen an extension that will position and resize a window based on its title, but I want to position the window in the horizontal center of the display (currently using hard-coded coordinates). I therefore need to know the dimensions of the display/workspace where the window lives.

I've looked through the available libraries listed in docs/reference/shell/urlmap.js (GNOME Shell source), and with its references to display, Meta seems to be where I want to be, but I'm not seeing an obvious function/class that would provide this information.

Can any Extension-knowledgeable soul out there point me in the right direction?

Answer 1

I'm going to answer my question using the approach I discovered (there are likely others)...

By using the window-created callback:

global.display.connect('window-created', this._onWindowCreated.bind(this));

A display argument is provided to the specified callback function. This display argument provides a method for retrieving the geometry of a given monitor:

display.get_monitor_geometry(0);

Using this, I'm able to retrieve the width and height of the specified monitor where the new window exists, and this let's me get it centered on the screen. \o/