def do_selection_request_event(self, event):
log("do_selection_request_event(%s)", event)
self._selection_request_events += 1
if not self._enabled or not self._can_receive:
gtk.Invisible.do_selection_request_event(self, event)
return
# Black magic: the superclass default handler for this signal
# implements all the hards parts of selection handling, occasionally
# calling back to the do_selection_get handler (below) to actually get
# the data to be sent. However, it only does this for targets that
# have been registered ahead of time; other targets fall through to a
# default implementation that cannot be overridden. So, we swoop in
# ahead of time and add whatever target was requested to the list of
# targets we want to handle!
#
# Special cases (magic targets defined by ICCCM):
# TIMESTAMP: the remote side has a different timeline than us, so
# sending TIMESTAMPS across the wire doesn't make any sense. We
# ignore TIMESTAMP requests, and let them fall through to GTK+'s
# default handler.
# TARGET: GTK+ has default handling for this, but we don't want to
# use it. Fortunately, if we tell GTK+ that we can handle TARGET
# requests, then it will pass them on to us rather than fall
# through to the default handler.
# MULTIPLE: Ugh. To handle this properly, we need to go out
# ourselves and fetch the magic property off the requesting window
# (with proper error trapping and all), and interpret its
# contents. Probably doable (FIXME), just a pain.
#
# Another special case is that if an app requests the contents of a
# clipboard that it currently owns, then GTK+ will short-circuit the
# normal logic and request the contents directly (i.e. it calls
# gtk_selection_invoke_handler) -- without giving us a chance to
# assert that we can handle the requested sort of target. Fortunately,
# Xpra never needs to request the clipboard when it owns it, so that's
# okay.
assert str(event.selection) == self._selection, "selection does not match: expected %s but got %s" % (event.selection, self._selection)
target = str(event.target)
if target == "TIMESTAMP":
pass
elif target == "MULTIPLE":
if not self.prop_get:
log("MULTIPLE for property '%s' not handled due to missing xpra.x11.gtk_x11 bindings", event.property)
gtk.Invisible.do_selection_request_event(self, event)
return
atoms = self.prop_get(event.window, event.property, ["multiple-conversion"])
log("MULTIPLE clipboard atoms: %r", atoms)
if atoms:
targets = atoms[::2]
for t in targets:
selection_add_target(self, self._selection, t, 0)
else:
log("target for %s: %r", self._selection, target)
selection_add_target(self, self._selection, target, 0)
log("do_selection_request_event(%s) target=%s, selection=%s", event, target, self._selection)
gtk.Invisible.do_selection_request_event(self, event)
def got_token(self,
targets,
target_data,
claim=True,
synchronous_client=False):
# We got the anti-token.
self.cancel_emit_token()
if not self._enabled:
return
self._got_token_events += 1
log(
"got token, selection=%s, targets=%s, target data=%s, claim=%s, can-receive=%s",
self._selection, targets, target_data, claim, self._can_receive)
if self._greedy_client or CLIPBOARD_GREEDY:
self._block_owner_change = True
#re-enable the flag via idle_add so events like do_owner_changed
#get a chance to run first.
glib.idle_add(self.remove_block)
if (CLIPBOARD_GREEDY or synchronous_client) and self._can_receive:
if targets:
for target in targets:
selection_add_target(self, self._selection, target, 0)
selection_owner_set(self, self._selection)
if target_data:
for text_target in TEXT_TARGETS:
if text_target in target_data:
text_data = target_data.get(text_target)
log("clipboard %s set to '%s'", self._selection,
repr_ellipsized(text_data))
set_clipboard_data(self._clipboard, text_data,
text_target)
if not claim:
log("token packet without claim, not setting the token flag")
#the other end is just telling us to send the token again next time something changes,
#not that they want to own the clipboard selection
return
self._have_token = True
if self._can_receive:
if not self._block_owner_change:
#if we don't claim the selection (can-receive=False),
#we will have to send the token back on owner-change!
self._block_owner_change = True
glib.idle_add(self.remove_block)
self.claim()
