[Mindwrapper] proposed changes in presenters

[Donnal W. <don...@ya...>]

This is just to give everyone a heads up that I intend to make
significant changes in how references are used by presenters in the
near future. The current way that component presenters (like
TextField and SpinButton) work is that they accept a single 'ref'
argument to be the model (from the abstraction layer) for that
presenter.

The proposed change is to allow all presenters (both components and
composites) to accept a list of references, the FIRST of which will
act as the model for the presenter. Other references in the list
will form the arguments for event handlers, so that it will be
easier to write event handlers. The prototype for this technique: 

        ...
        wx.EVT_XXX(self, self.GetId(), self._onEvent)

    def _onEvent(self, event):
        self.OnEvent(*self._ref)
        event.Skip()

    def OnEvent(self, model, arg1, arg2):
        # this method overridden to do something
        #   with model and other arguments

An alternative would be to pass the event to OnEvent() as well:

    def _onEvent(self, event):
        self.OnEvent(event, *self._ref)
        event.Skip()

    def OnEvent(self, event, model, arg1, arg2):
        # this method overridden to do something
        #   with model, arguments and event


Regards,

=====
Donnal Walter
Arkansas Children's Hospital