1# This file is part of Xpra. 

2# Copyright (C) 2008, 2009 Nathaniel Smith <njs@pobox.com> 

3# Copyright (C) 2013-2020 Antoine Martin <antoine@xpra.org> 

4# Xpra is released under the terms of the GNU GPL v2, or, at your option, any 

5# later version. See the file COPYING for details. 

6 

7 

8from gi.repository import GObject 

9SIGNAL_RUN_LAST = GObject.SignalFlags.RUN_LAST 

10def n_arg_signal(n): 

11 return (SIGNAL_RUN_LAST, GObject.TYPE_NONE, (GObject.TYPE_PYOBJECT,) * n) 

12no_arg_signal = n_arg_signal(0) 

13one_arg_signal = n_arg_signal(1) 

14two_arg_signal = n_arg_signal(2) 

15 

16 

17class AutoPropGObjectMixin: 

18 """Mixin for automagic property support in GObjects. 

19 

20 Make sure this is the first entry on your parent list, so super().__init__ 

21 will work right.""" 

22 def __init__(self): 

23 self._gproperties = {} 

24 

25 def do_get_property(self, pspec): 

26 return self._gproperties.get(pspec.name) 

27 

28 def do_set_property(self, pspec, value): 

29 self._internal_set_property(pspec.name, value) 

30 

31 # Exposed for subclasses that wish to set readonly properties -- 

32 # .set_property (the public api) will fail, but the property can still be 

33 # modified via this method. 

34 def _internal_set_property(self, name, value): 

35 setter = "do_set_property_" + name.replace("-", "_") 

36 if hasattr(self, setter): 

37 getattr(self, setter)(name, value) 

38 else: 

39 self._gproperties[name] = value 

40 self.notify(name) 

41 

42 

43# Collects the results from signal handlers for a given signal into a list, 

44# ignoring all handlers that return None. (This filtering is useful because 

45# the intended use of this method is to "poll" all connected objects, so it's 

46# pretty useless to call a default do_* method... but even if such a method is 

47# not defined, a default implementation will still be called automatically, 

48# and that implementation simply returns None.) 

49def non_none_list_accumulator(_ihint, return_accu, handler_return): 

50 if return_accu is None: 

51 return_accu = [] 

52 if handler_return is not None: 

53 return_accu += [handler_return] 

54 return True, return_accu