wxPython/tests/test_evtHandler.py

   1
   2 import wx
   3
   4
   5 # This class is just an experiment to see how easy it would be to
   6 # handle simulating transfer of ownership of object to a 'parent'
   7 # object, and then automatically calling Destroy on those when the
   8 # parent is destroyed.  Conclusion: It's not too hard at all. Now,
   9 # what should I do with it...
  10 class DestroyWrapper(object):
  11     def __init__(self):
  12         import weakref
  13         self.items = weakref.WeakValueDictionary()
  14
  15     def AddItem(self, obj):
  16         self.items[len(self.items)+1] = obj
  17
  18     def __del__(self):
  19         for item in self.items.values():
  20             item.Destroy()
  21
  22
  23
  24
  25
  26 class MyEvtHandler(wx.EvtHandler):
  27     instCount = 0
  28
  29     def __init__(self):
  30         wx.EvtHandler.__init__(self)
  31         MyEvtHandler.instCount += 1
  32         self.cnt = MyEvtHandler.instCount
  33         self.Bind(wx.EVT_CHECKBOX, self.OnCheckBox)
  34
  35     def __del__(self):
  36         print "%02d: deleted" % self.cnt
  37
  38     def OnCheckBox(self, evt):
  39         print "%02d: %s" % (self.cnt, evt.IsChecked())
  40         evt.Skip()
  41
  42
  43
  44 class MyFrame(wx.Frame):
  45     def __init__(self):
  46         wx.Frame.__init__(self, None, title="wx.EvtHandler Test")
  47         p = wx.Panel(self)
  48
  49         pushBtn = wx.Button(p, -1, "Push EvtHandler", (20,20))
  50         popBtn  = wx.Button(p, -1, "Pop EvtHandler", (20,60))
  51
  52         checkBox = wx.CheckBox(p, -1, "Test EvtHandler", (200, 25))
  53
  54         self.Bind(wx.EVT_BUTTON, self.OnPushBtn, pushBtn)
  55         self.Bind(wx.EVT_BUTTON, self.OnPopBtn, popBtn)
  56
  57 ##        self.dw = DestroyWrapper()
  58
  59
  60     def OnPushBtn(self, evt):
  61         eh = MyEvtHandler()
  62         self.PushEventHandler(eh)
  63 ##        self.dw.AddItem(eh)
  64         print "%02d: pushed" % eh.cnt
  65
  66
  67     def OnPopBtn(self, evt):
  68         eh = self.GetEventHandler()
  69         if eh.this == self.this:
  70             print "All already popped!"
  71         else:
  72             eh = self.PopEventHandler()
  73             print "%02d: popped( %s )" % (eh.cnt, eh.__class__)
  74             eh.Destroy()
  75
  76
  77
  78 app = wx.App(False)
  79 frm = MyFrame()
  80 frm.Show()
  81 app.MainLoop()