On the age old issue of passing parameters to childwindow, I think it's rather confusing tha
t we have to rely on "trick" to do it.  See, for example:

http://wiki.wxpython.org/index.cgi/PythonCardTricks

where it was suggested that we use the rather unnatural and "magical" way of:

def on_Button1_mouseClick(self, event):
   self.childWin = model.ChildWindow(self, bar.Bar)
   self.childWin.dbNamePassedFromParent = self.databaseName
Instead of doing that, is there anything wrong if I pass down a CallBackFunction such as:

    def on_Button1_mouseClick(self, event):
        self.childWin = model.childWindow(self, tchild, SetInitParamFct=self.SetChildInitPar
am)
        pass
        
    def SetChildInitParam(self, childWindow):
         ...do what ever...
        pass

and then in childWindow, we allow an extra parameter:

def childWindow(parent, frameClass, filename=None, rsrc=None, SetInitParamFct=SetInitParam):
.....
    return frameClass(parent, rsrc.application.backgrounds[0], SetInitParamFct=SetInitParamF
ct)

and then invoke the call back function at the very end of the __init__ function of the Backg
round class:

class Background(Scriptable, wx.Frame, event.EventSource):

    def __init__(self, aParent, aBgRsrc, SetInitParamFct=SetInitParam):
         ....
          SetInitParamFct(self)
          return

Of course, I need a stub function somewhere in model.py in case the call back function was n
ot defined:

# Stub function for setting ChildWindow parameters

def SetInitParam(childWindow):

    pass

    
Does anybody know if there would be side-effects that I am not aware of?

With this approach, I don't need to remind myself how the event dispatcher works when I look
 at my own code few years down the road....



 
--
John Henry



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