/library/DeferredCommand.py

 1from Timer import Timer
 2
 3deferredCommands = []
 4timerIsActive = False
 5
 6class DeferredCommand:
 7    def add(self, cmd):
 8        global deferredCommands
 9
10        deferredCommands.append(cmd)
11        self.maybeSetDeferredCommandTimer()
12    
13    def flushDeferredCommands(self):
14        global deferredCommands
15        
16        for i in range(len(deferredCommands)):
17            current = deferredCommands[0]
18            del deferredCommands[0]
19            
20            if current == None:
21                return
22            else:
23                current.execute()
24
25    def maybeSetDeferredCommandTimer(self):
26        global timerIsActive, deferredCommands
27        
28        if (not timerIsActive) and (not len(deferredCommands)==0):
29            Timer(1, self)
30            timerIsActive = True
31            
32    def onTimer(self):
33        global timerIsActive
34
35        self.flushDeferredCommands()
36        timerIsActive = False
37        self.maybeSetDeferredCommandTimer()
38
39