Source Code for Module _Framework.Disconnectable

 1  #Embedded file name: /Users/versonator/Hudson/live/Projects/AppLive/Resources/MIDI Remote Scripts/_Framework/Disconnectable.py 
 2  """ 
 3  Interface for items that adquire resources. 
 4  """ 
 5  from Util import find_if 
 6   
 7 -class Disconnectable(object): 
 8      """ 
 9      Represents an entity that holds connections to other objects that 
10      should be explicitly cleared to avoid object lifetime problems or 
11      leaking listeners. 
12      """ 
13   
14 -    def disconnect(self): 
15          pass 
16   
17   
18 -class CompoundDisconnectable(Disconnectable): 
19      """ 
20      Compound disconnectable. Collects other disconnectables and 
21      disconnects them recursively. 
22      """ 
23   
24 -    def __init__(self, *a, **k): 
25          super(CompoundDisconnectable, self).__init__(*a, **k) 
26          self._registered_disconnectables = [] 
27   
28 -    def register_disconnectable(self, slot): 
29          if slot not in self._registered_disconnectables: 
30              self._registered_disconnectables.append(slot) 
31          return slot 
32   
33 -    def unregister_disconnectable(self, slot): 
34          if slot in self._registered_disconnectables: 
35              self._registered_disconnectables.remove(slot) 
36   
37 -    def disconnect_disconnectable(self, slot): 
38          if slot in self._registered_disconnectables: 
39              self._registered_disconnectables.remove(slot) 
40              slot.disconnect() 
41   
42 -    def find_disconnectable(self, predicate): 
43          return find_if(predicate, self._registered_disconnectables) 
44   
45 -    def has_disconnectable(self, slot): 
46          return slot in self._registered_disconnectables 
47   
48 -    def disconnect(self): 
49          for slot in self._registered_disconnectables: 
50              slot.disconnect() 
51   
52          self._registered_disconnectables = [] 
53          super(CompoundDisconnectable, self).disconnect() 
54   
55   
56 -class disconnectable(object): 
57      """ 
58      Context manager that will disconnect the given disconnectable when 
59      the context is exited.  It returns the original disconnectable. 
60      """ 
61   
62 -    def __init__(self, managed = None, *a, **k): 
63          super(disconnectable, self).__init__(*a, **k) 
64          self._managed = managed 
65   
66 -    def __enter__(self): 
67          managed = self._managed 
68          return managed 
69   
70 -    def __exit__(self, *a, **k): 
71          if self._managed is not None: 
72              self._managed.disconnect() 
73