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Commit	Line	Data
	1
	2	import wx
	3	import wx.html as wxhtml
	4
	5	#----------------------------------------------------------------------
	6
	7	BTN1 = wx.NewId()
	8	BTN2 = wx.NewId()
	9
	10	class TestPanel(wx.Panel):
	11	def __init__(self, parent, log):
	12	wx.Panel.__init__(self, parent, -1)
	13	self.log = log
	14
	15	sizer = wx.BoxSizer(wx.VERTICAL)
	16	html = wxhtml.HtmlWindow(self, -1)
	17	html.SetPage(overview)
	18	sizer.Add(html, 1, wx.EXPAND\|wx.ALL, 5)
	19
	20	btns = wx.BoxSizer(wx.HORIZONTAL)
	21	btns.Add((50, -1), 1, wx.EXPAND)
	22	btn1 = wx.Button(self, BTN1, "Find My Alter-ego") # don't save a ref to this one
	23	btns.Add(btn1)
	24	btns.Add((50, -1), 1, wx.EXPAND)
	25	self.btn2 = wx.Button(self, BTN2, "Find Myself")
	26	btns.Add(self.btn2)
	27	btns.Add((50, -1), 1, wx.EXPAND)
	28
	29	sizer.Add(btns, 0, wx.EXPAND\|wx.ALL, 15)
	30
	31	self.SetSizer(sizer)
	32	self.SetAutoLayout(True)
	33
	34	self.sizer = sizer # save it for testing later
	35
	36	self.Bind(wx.EVT_BUTTON, self.OnFindButton1, id=BTN1)
	37	self.Bind(wx.EVT_BUTTON, self.OnFindButton2, id=BTN2)
	38
	39
	40	def OnFindButton1(self, evt):
	41	win = self.FindWindowById(BTN1)
	42
	43	if win is None:
	44	self.log.write("***** OOPS! None returned...\n")
	45	return
	46
	47	className = win.__class__.__name__
	48
	49	if className in ["Button", "ButtonPtr"]:
	50	self.log.write("The types are the same! <grin>\n")
	51	else:
	52	self.log.write("Got %s, expected wxButton or wxButtonPtr\n" % className)
	53
	54
	55
	56	def OnFindButton2(self, evt):
	57	win = self.FindWindowById(BTN2)
	58
	59	if win is None:
	60	self.log.write("***** OOPS! None returned...\n")
	61	return
	62
	63	if win is self.btn2:
	64	self.log.write("The objects are the same! <grin>\n")
	65	else:
	66	self.log.write("The objects are NOT the same! <frown>\n")
	67
	68	win = evt.GetEventObject()
	69
	70	if win is None:
	71	self.log.write("***** OOPS! None returned...\n")
	72	return
	73
	74	if win is self.btn2:
	75	self.log.write("The objects are the same! <grin>\n")
	76	else:
	77	self.log.write("The objects are NOT the same! <frown>\n")
	78
	79	sizer = self.GetSizer()
	80
	81	if sizer is None:
	82	self.log.write("***** OOPS! None returned...\n")
	83	return
	84
	85	if sizer is self.sizer:
	86	self.log.write("The objects are the same! <grin>\n")
	87	else:
	88	self.log.write("The objects are NOT the same! <frown>\n")
	89
	90
	91	#----------------------------------------------------------------------
	92
	93	def runTest(frame, nb, log):
	94	win = TestPanel(nb, log)
	95	return win
	96
	97	#----------------------------------------------------------------------
	98
	99
	100	overview = """\
	101	<html><body>
	102	<h2>Original Object Return</h2>
	103
	104	<p>Several methods in wxWindows return pointers to base class objects,
	105	when in fact the actual object pointed to is of a derived type. Since
	106	SWIG isn't able to tell the actual type it just creates a new Python
	107	shadow object of the base type to wrap around the base type pointer
	108	and returns it.
	109
	110	<p>In wxPython prior to 2.3.0 this could cause annoying issues. For
	111	example if you called:
	112
	113	<pre>
	114
	115	myText = someWindow.FindWindowById(txtID)
	116	</pre>
	117
	118	expecting to get a wxTextCtrl you would actually get a wxWindow object
	119	instead. If you then try to call SetValue on that object you'll get
	120	an exception since there is no such method. This is the reason for
	121	the wxPyTypeCast hack that has been in wxPython for so long.
	122
	123	<p>Even with wxPyTypeCast there was the issue that the object returned
	124	was not the same one that was created in Python originally, but a new
	125	object of the same type that wraps the same C++ pointer. If the
	126	programmer has set additional attributes of that original object they
	127	will not exist in the new object.
	128
	129	<p>For a long time now I have wanted to do away with wxPyTypeCast and
	130	also find a way to return the original Python object from methods like
	131	FindWindowById. This project naturally divides into two phases:
	132
	133	<p><ol>
	134
	135	<li>Teach the wrapper methods how to return objects of the right type,
	136	and be able to then turn wxPyTypeCast in to a no-op.
	137
	138	<li>Be able to return the original Python shadow object if it still exists.
	139
	140	</ol>
	141
	142	<p>The first button below shows the first of these phases (<i>working</i>)
	143	and the second will show #2 (<i>working as of Python 2.3.2</i>)
	144
	145	</body></html>
	146	"""
	147
	148
	149
	150
	151	if __name__ == '__main__':
	152	import sys,os
	153	import run
	154	run.main(['', os.path.basename(sys.argv[0])])
	155