2001-05-17 18:47:09 -04:00
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from wxPython.wx import *
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from wxPython.html import *
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#----------------------------------------------------------------------
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BTN1 = wxNewId()
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BTN2 = wxNewId()
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class TestPanel(wxPanel):
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def __init__(self, parent, log):
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wxPanel.__init__(self, parent, -1)
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self.log = log
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sizer = wxBoxSizer(wxVERTICAL)
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html = wxHtmlWindow(self, -1)
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html.SetPage(overview)
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sizer.Add(html, 1, wxEXPAND|wxALL, 5)
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btns = wxBoxSizer(wxHORIZONTAL)
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btns.Add(50, -1, 1, wxEXPAND)
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btn1 = wxButton(self, BTN1, "Find My Alter-ego") # don't save a ref to this one
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btns.Add(btn1)
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btns.Add(50, -1, 1, wxEXPAND)
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self.btn2 = wxButton(self, BTN2, "Find Myself")
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btns.Add(self.btn2)
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btns.Add(50, -1, 1, wxEXPAND)
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2001-05-18 17:59:59 -04:00
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sizer.Add(btns, 0, wxEXPAND|wxLEFT|wxRIGHT|wxBOTTOM, 25)
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2001-05-17 18:47:09 -04:00
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self.SetSizer(sizer)
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self.SetAutoLayout(true)
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EVT_BUTTON(self, BTN1, self.OnFindButton1)
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EVT_BUTTON(self, BTN2, self.OnFindButton2)
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def OnFindButton1(self, evt):
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win = self.FindWindowById(BTN1)
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if win is None:
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self.log.write("***** OOPS! None returned...\n")
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return
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className = win.__class__.__name__
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if className in ["wxButton", "wxButtonPtr"]:
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self.log.write("The types are the same! <grin>\n")
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else:
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self.log.write("Got %s, expected wxButton or wxButtonPtr\n" % className)
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def OnFindButton2(self, evt):
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win = self.FindWindowById(BTN2)
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if win is None:
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self.log.write("***** OOPS! None returned...\n")
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return
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if win is self.btn2:
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self.log.write("The objects are the same! <grin>\n")
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else:
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self.log.write("The objects are NOT the same! <frown>\n")
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#----------------------------------------------------------------------
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def runTest(frame, nb, log):
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win = TestPanel(nb, log)
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return win
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#----------------------------------------------------------------------
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overview = """\
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<html><body>
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<h2>Original Object Return</h2>
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<p>Several methods in wxWindows return pointers to base class objects,
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when in fact the actual object pointed to is of a derived type. Since
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SWIG isn't able to tell the actual type it just creates a new Python
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shadow object of the base type to wrap around the base type pointer
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and returns it.
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<p>In wxPython this can cause annoying issues. For example if you
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call:
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<pre>
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myText = someWindow.FindWindowById(txtID)
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</pre>
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expecting to get a wxTextCtrl you will actually get a wxWindow object
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instead. If you then try to call SetValue on that object you'll get
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an exception since there is no such method. This is the reason for
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the wxPyTypeCast hack that has been in wxPython for so long.
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<p>Even with wxPyTypeCast there is the issue that the object returned
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is not the same one that was created in Python originally, but a new
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object of the same type that wraps the same C++ pointer. If the
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programmer has set additional attributes of that original object they
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will not exist in the new object.
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<p>For a long time now I have wanted to do away with wxPyTypeCast and
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also find a way to return the original Python object from methods like
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FindWindowById. This project naturally divides into two phases:
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<p><ol>
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<li>Teach the wrapper methods how to return objects of the right type,
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and be able to then turn wxPyTypeCast in to a no-op.
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<li>Be able to return the original Python shadow object if it still exists.
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</ol>
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<p>The first button below shows the first of these phases (<i>working</i>)
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and the second will show #2 (<i>not yet working.</i>)
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</body></html>
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"""
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