Je ne pouvais pas faire fonctionner votre approche de changement de focus de manière fiable sous Kwin 4.x, mais les gestionnaires de fenêtres modernes conservent une _NET_ACTIVE_WINDOW
propriété sur la fenêtre racine que vous pouvez écouter pour les modifications.
Voici une implémentation Python de cela:
#!/usr/bin/python
from contextlib import contextmanager
import Xlib
import Xlib.display
disp = Xlib.display.Display()
root = disp.screen().root
NET_ACTIVE_WINDOW = disp.intern_atom('_NET_ACTIVE_WINDOW')
NET_WM_NAME = disp.intern_atom('_NET_WM_NAME') # UTF-8
WM_NAME = disp.intern_atom('WM_NAME') # Legacy encoding
last_seen = { 'xid': None, 'title': None }
@contextmanager
def window_obj(win_id):
"""Simplify dealing with BadWindow (make it either valid or None)"""
window_obj = None
if win_id:
try:
window_obj = disp.create_resource_object('window', win_id)
except Xlib.error.XError:
pass
yield window_obj
def get_active_window():
win_id = root.get_full_property(NET_ACTIVE_WINDOW,
Xlib.X.AnyPropertyType).value[0]
focus_changed = (win_id != last_seen['xid'])
if focus_changed:
with window_obj(last_seen['xid']) as old_win:
if old_win:
old_win.change_attributes(event_mask=Xlib.X.NoEventMask)
last_seen['xid'] = win_id
with window_obj(win_id) as new_win:
if new_win:
new_win.change_attributes(event_mask=Xlib.X.PropertyChangeMask)
return win_id, focus_changed
def _get_window_name_inner(win_obj):
"""Simplify dealing with _NET_WM_NAME (UTF-8) vs. WM_NAME (legacy)"""
for atom in (NET_WM_NAME, WM_NAME):
try:
window_name = win_obj.get_full_property(atom, 0)
except UnicodeDecodeError: # Apparently a Debian distro package bug
title = "<could not decode characters>"
else:
if window_name:
win_name = window_name.value
if isinstance(win_name, bytes):
# Apparently COMPOUND_TEXT is so arcane that this is how
# tools like xprop deal with receiving it these days
win_name = win_name.decode('latin1', 'replace')
return win_name
else:
title = "<unnamed window>"
return "{} (XID: {})".format(title, win_obj.id)
def get_window_name(win_id):
if not win_id:
last_seen['title'] = "<no window id>"
return last_seen['title']
title_changed = False
with window_obj(win_id) as wobj:
if wobj:
win_title = _get_window_name_inner(wobj)
title_changed = (win_title != last_seen['title'])
last_seen['title'] = win_title
return last_seen['title'], title_changed
def handle_xevent(event):
if event.type != Xlib.X.PropertyNotify:
return
changed = False
if event.atom == NET_ACTIVE_WINDOW:
if get_active_window()[1]:
changed = changed or get_window_name(last_seen['xid'])[1]
elif event.atom in (NET_WM_NAME, WM_NAME):
changed = changed or get_window_name(last_seen['xid'])[1]
if changed:
handle_change(last_seen)
def handle_change(new_state):
"""Replace this with whatever you want to actually do"""
print(new_state)
if __name__ == '__main__':
root.change_attributes(event_mask=Xlib.X.PropertyChangeMask)
get_window_name(get_active_window()[0])
handle_change(last_seen)
while True: # next_event() sleeps until we get an event
handle_xevent(disp.next_event())
La version la plus commentée que j'ai écrite comme exemple pour quelqu'un est dans cet esprit .
MISE À JOUR: Maintenant, il montre également la seconde moitié (écouter _NET_WM_NAME
) pour faire exactement ce qui a été demandé.
MISE À JOUR # 2: ... et la troisième partie: Revenir à WM_NAME
si quelque chose comme xterm n'a pas encore été défini _NET_WM_NAME
. (Ce dernier est UTF-8 codé alors que le premier est censé utiliser un caractère hérité de codage appelé texte composé mais, puisque personne ne semble savoir comment travailler avec elle, vous obtenez des programmes jeter tout flux d'octets qu'ils ont là - bas et xprop
juste en supposant ce sera ISO-8859-1.)