1 import wx
   2 
   3 # an observable calls callback functions when the data has
   4 # changed
   5 #o = Observable()
   6 #def func(data):
   7 # print "hello", data
   8 #o.addCallback(func)
   9 #o.set(1)
  10 # --| "hello", 1
  11 
  12 class Observable:
  13   def __init__(self, initialValue=None):
  14     self.data = initialValue
  15     self.callbacks = {}
  16 
  17   def addCallback(self, func):
  18     self.callbacks[func] = 1
  19 
  20   def delCallback(self, func):
  21     del self.callback[func]
  22 
  23   def _docallbacks(self):
  24     for func in self.callbacks:
  25       func(self.data)
  26 
  27   def set(self, data):
  28     self.data = data
  29     self._docallbacks()
  30 
  31   def get(self):
  32     return self.data
  33 
  34   def unset(self):
  35     self.data = None
  36 
  37 class Model:
  38   def __init__(self):
  39     self.myMoney = Observable(0)
  40 
  41   def addMoney(self, value):
  42     self.myMoney.set(self.myMoney.get() + value)
  43 
  44   def removeMoney(self, value):
  45     self.myMoney.set(self.myMoney.get() - value)
  46 
  47 
  48 class View(wx.Frame):
  49   def __init__(self, parent):
  50     wx.Frame.__init__(self, parent, -1, "Main View")
  51     sizer = wx.BoxSizer(wx.VERTICAL)
  52     text = wx.StaticText(self, -1, "My Money")
  53     ctrl = wx.TextCtrl(self, -1, "")
  54     sizer.Add(text, 0, wx.EXPAND|wx.ALL)
  55     sizer.Add(ctrl, 0, wx.EXPAND|wx.ALL)
  56     self.moneyCtrl = ctrl
  57     ctrl.SetEditable(False)
  58     self.SetSizer(sizer)
  59     self.moneyCtrl = ctrl
  60 
  61   def SetMoney(self, money):
  62     self.moneyCtrl.SetValue(str(money))
  63 
  64 class ChangerWidget(wx.Frame):
  65   def __init__(self, parent):
  66     wx.Frame.__init__(self, parent, -1, "Main View")
  67     sizer = wx.BoxSizer(wx.VERTICAL)
  68     self.add = wx.Button(self, -1, "Add Money")
  69     self.remove = wx.Button(self, -1, "Remove Money")
  70     sizer.Add(self.add, 0, wx.EXPAND|wx.ALL)
  71     sizer.Add(self.remove, 0, wx.EXPAND|wx.ALL)
  72     self.SetSizer(sizer)
  73 
  74 class Controller:
  75   def __init__(self, app):
  76     self.model = Model()
  77     self.view1 = View(None)
  78     self.view2 = ChangerWidget(self.view1)
  79     self.MoneyChanged(self.model.myMoney.get())
  80     self.view2.add.Bind(wx.EVT_BUTTON, self.AddMoney)
  81     self.view2.remove.Bind(wx.EVT_BUTTON, self.RemoveMoney)
  82 
  83     self.model.myMoney.addCallback(self.MoneyChanged)
  84     self.view1.Show()
  85     self.view2.Show()
  86 
  87   def AddMoney(self, evt):
  88     self.model.addMoney(10)
  89 
  90   def RemoveMoney(self, evt):
  91     self.model.removeMoney(10)
  92 
  93   def MoneyChanged(self, money):
  94     self.view1.SetMoney(money)
  95 
  96 
  97 app = wx.PySimpleApp()
  98 Controller(app)
  99 app.MainLoop()