def set_pixmap():
# The tricky part here is that the pixmap returned by
# NameWindowPixmap gets invalidated every time the window's
# viewable state changes. ("viewable" here is the X term that
# means "mapped, and all ancestors are also mapped".) But
# there is no X event that will tell you when a window's
# viewability changes! Instead we have to find all ancestors,
# and watch all of them for unmap and reparent events. But
# what about races? I hear you cry. By doing things in the
# exact order:
# 1) select for StructureNotify
# 2) QueryTree to get parent
# 3) repeat 1 & 2 up to the root
# 4) call NameWindowPixmap
# we are safe. (I think.)
listening = []
win = get_parent(self._window)
while win is not None and win.get_parent() is not None:
# We have to use a lowlevel function to manipulate the
# event selection here, because SubstructureRedirectMask
# does not roundtrip through the GDK event mask
# functions. So if we used them, here, we would clobber
# corral window selection masks, and those don't deserve
# clobbering. They are our friends! X is driving me
# slowly mad.
addXSelectInput(win, const["StructureNotifyMask"])
add_event_receiver(win, self)
listening.append(win)
win = get_parent(win)
handle = xcomposite_name_window_pixmap(self._window)
self._contents_handle = handle
# Don't save the listening set until after NameWindowPixmap
# has succeeded, to maintain our invariant:
self._listening_to = listening
def set_pixmap():
# The tricky part here is that the pixmap returned by
# NameWindowPixmap gets invalidated every time the window's
# viewable state changes. ("viewable" here is the X term that
# means "mapped, and all ancestors are also mapped".) But
# there is no X event that will tell you when a window's
# viewability changes! Instead we have to find all ancestors,
# and watch all of them for unmap and reparent events. But
# what about races? I hear you cry. By doing things in the
# exact order:
# 1) select for StructureNotify
# 2) QueryTree to get parent
# 3) repeat 1 & 2 up to the root
# 4) call NameWindowPixmap
# we are safe. (I think.)
listening = []
try:
win = get_parent(self._window)
while win is not None and win.get_parent() is not None:
# We have to use a lowlevel function to manipulate the
# event selection here, because SubstructureRedirectMask
# does not roundtrip through the GDK event mask
# functions. So if we used them, here, we would clobber
# corral window selection masks, and those don't deserve
# clobbering. They are our friends! X is driving me
# slowly mad.
addXSelectInput(win, const["StructureNotifyMask"])
add_event_receiver(win, self)
listening.append(win)
win = get_parent(win)
handle = xcomposite_name_window_pixmap(self._window)
except:
try:
self._cleanup_listening(listening)
except:
pass
raise
if handle is None:
log.warn(
"failed to name a window pixmap (expect an X error soon)",
type="pixmap")
self._cleanup_listening(listening)
else:
self._contents_handle = handle
# Don't save the listening set until after
# NameWindowPixmap has succeeded, to maintain our
# invariant:
self._listening_to = listening
def test_get_children_and_get_parent_and_reparent(self):
d2 = self.clone_display()
w1 = self.window(self.display)
w2 = self.window(d2)
gtk.gdk.flush()
assert not l.get_children(w1)
children = l.get_children(self.root())
xchildren = map(l.get_xwindow, children)
xwins = map(l.get_xwindow, [w1, w2])
# GDK creates an invisible child of the root window on each
# connection, so there are some windows we don't know about:
for known in xwins:
assert known in xchildren
assert l.get_parent(w1) == w1.get_parent()
w1.reparent(l.get_pywindow(w1, l.get_xwindow(w2)), 0, 0)
gtk.gdk.flush()
assert map(l.get_xwindow, l.get_children(w2)) == [l.get_xwindow(w1)]
assert l.get_parent(w1).xid == w2.xid
def test_get_parent_of_root(self):
assert l.get_parent(self.root()) is None
