Source Code for Module rats.test.test_sig

 1  #!/usr/bin/env python 
 2  """ 
 3  File:    signal.py 
 4  Author:  Thiago Marcos P. Santos 
 5  Created: August 28, 2008 
 6   
 7  Purpose: A signal/slot implementation 
 8  Source: http://code.activestate.com/recipes/576477/ 
 9   
10  A Signal calls all the callbacks registered in its slots whenever it state  
11  changes.  
12  """ 
13  from rats import sig 
14  import unittest 
15   
16  VERBOSE = False 
17   
18 -class Test_Signal_Slot(unittest.TestCase): 
19      """ 
20      Tests the signal/slot pattern. 
21      """ 
22 -    def test_sig(self): 
23          class Model(object): 
24              def __init__(self, value): 
25                  self._value = value 
26                  self.changed = sig.Signal() 
27   
28              def set_value(self, value): 
29                  self._value = value 
30                  self.changed() # Emit signal 
31   
32              def get_value(self): 
33                  return self._value 
34   
35          class View(object): 
36              def __init__(self, model, test): 
37                  self.model = model 
38                  self.test = test 
39                  model.changed.connect(self.model_changed) 
40   
41              def model_changed(self): 
42                  self.new_value = self.model.get_value() 
43                  if VERBOSE: 
44                      print("New value : %d" % (self.new_value)) 
45   
46          # create a model and 3 listeners: 
47          model = Model(10) 
48          view1 = View(model, self) 
49          view2 = View(model, self) 
50          view3 = View(model, self) 
51          # trigger one signal: 
52          model.set_value(20) 
53          # delete one listener: 
54          del view1 
55          model.set_value(30) 
56          # To disconnect :  
57          model.changed.disconnect(view2.model_changed) 
58          model.set_value(15) 
59          if view2.new_value == 15: 
60              self.fail("view2 slot should not have been triggered.") 
61          # remove all listeners: 
62          model.changed.clear()  
63          model.set_value(40) 
64          if view3.new_value == 40: 
65              self.fail("view3 slot should not have been triggered.") 
66