<html><head></head><body><div>You just select PropertyNotify. It tells you which property has updated in the event (for example xprop -root -spy _NET_ACTIVE_WINDOW). </div> <div>One small note: check the actual value of the property since a window manager may set it to None if no window has focus. </div> <div>Regards Ingo </div> <div class="gmail_quote" >On Oct 15, 2016, at 20:16, Jack Bates <<a href="mailto:m7iwhf@nottheoilrig.com" target="_blank">m7iwhf@nottheoilrig.com</a>> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <pre class="blue">Thanks! Is there an event for _NET_ACTIVE_WINDOW, or should I continue to wait for FocusIn but then read _NET_ACTIVE_WINDOW? On 15/10/16 09:46 AM, Ingo Bürk wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> You're selecting FocusIn on the root window, but you won't really ever see it being triggered there. You'd need to select it on each top-level window and also keep track of new windows being mapped etc. If you have an at least somewhat EWMH compliant window manager I'd suggest you just watch _NET_ACTIVE_WINDOW on the root window instead. On 10/15/2016 05:25 PM, Jack Bates wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #ad7fa8; padding-left: 1ex;"> How do I get the *new* active window after a FocusInEvent? The following is my attempt, but I get the *old* active window instead. My goal is to automatically move the mouse to the new active window when I change active windows, say by pressing Alt-Tab or closing the old active window. <blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #8ae234; padding-left: 1ex;"> #!/usr/bin/env python3 import xcffib from xcffib.xproto import CW from xcffib.xproto import EventMask from xcffib.xproto import FocusInEvent conn = xcffib.connect() setup = conn.get_setup() for screen in setup.roots: conn.core.ChangeWindowAttributes( screen.root, CW.EventMask, [ EventMask.FocusChange, ], ) conn.flush() while True: event = conn.wait_for_event() if isinstance(event, FocusInEvent): reply = conn.core.GetInputFocus().reply() conn.core.WarpPointer( xcffib.XCB_NONE, reply.focus, xcffib.XCB_NONE, xcffib.XCB_NONE, xcffib.XCB_NONE, xcffib.XCB_NONE, 0, 0, ) conn.flush() </blockquote></blockquote></blockquote><hr> Xcb mailing list Xcb@lists.freedesktop.org <a href="https://lists.freedesktop.org/mailman/listinfo/xcb">https://lists.freedesktop.org/mailman/listinfo/xcb</a></pre></blockquote></div></body></html>