matplotlib navtoolbar doesn't realize in wx 2.9 (Mac OS X)

The following piece of code produces a matplotlib NavToolbar2 at the top of a frame as expected when run on wxPython 2.8.x, Python 2.5.4/2.6, Matplotlib 0.99.x.

However, I've recently moved to Python 2.7, and wxPython 2.9.1 in an attempt to support OS X in 64-bit. It's under this environment that the code below produces an empty toolbar:

I noticed when building matplotlib that it said something about not needing WxAgg for wx 2.9 and up, might this be the problem? All I've tried so far is to replace FigureCanvasWxAgg with FigureCanvasWx and NavigationToolbar2WxAgg with NavigationToolbar2Wx. No luck.

Any ideas what's going on?

import wx
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg, NavigationToolbar2WxAgg
import matplotlib as mpl

app = wx.PySimpleApp()
f = wx.Frame(None)
fig = mpl.figure.Figure()
p = FigureCanvasWxAgg(f, -1, fig)
tb = NavigationToolbar2WxAgg(fig.canvas)
f.SetToolBar(tb)
tb.Realize()
f.Show()
app.MainLoop()

One more thing... if I replace the NavigationToolbar2WxAgg with my own custom navtoolbar class (code at first answer on this thread: Add new navigate modes in matplotlib), the whole thing crashes unless I remove tb.Realize().

2011-05-25 08:21:18.354 Python[48013:60f] *** Assertion failure in -[NSToolbar _itemAtIndex:], /SourceCache/AppKit/AppKit-1038.35/Toolbar.subproj/NSToolbar.m:1227
2011-05-25 08:21:18.356 Python[48013:60f] An uncaught exception was raised
2011-05-25 08:21:18.356 Python[48013:60f] Invalid parameter not satisfying: index>=0 && index<[self _numberOfItems]
2011-05-25 08:21:18.358 Python[48013:60f] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: index>=0 && index<[self _numberOfItems]'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x00007fff868ef7b4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x00007fff83e9b0f3 objc_exception_throw + 45
    2   CoreFoundation                      0x00007fff868ef5d7 +[NSException raise:format:arguments:] + 103
    3   Foundation                          0x00007fff86d7c77e -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
    4   AppKit                              0x00007fff806f44a9 -[NSToolbar _itemAtIndex:] + 158
    5   AppKit                              0x00007fff806f3e94 -[NSToolbar _removeItemAtIndex:notifyDelegate:notifyView:notifyFamilyAndUpdateDefaults:] + 56
    6   libwx_osx_cocoau-2.9.1.0.0.dylib    0x0000000101aea2a6 _ZN9wxToolBar7RealizeEv + 1430
    7   _controls_.so                       0x00000001048d4b76 _wrap_ToolBarBase_Realize + 102
    8   .Python                             0x00000001000ca81a PyEval_EvalFrameEx + 23498
    9   .Python                             0x00000001000cc8c5 PyEval_EvalCodeEx + 1733
    10  .Python                             0x00000001000ca9bf PyEval_EvalFrameEx + 23919
    11  .Python                             0x00000001000cc8c5 PyEval_EvalCodeEx + 1733
    12  .Python                             0x00000001000cb0c8 PyEval_EvalFrameEx + 25720
    13  .Python                             0x00000001000cc8c5 PyEval_EvalCodeEx + 1733
    14  .Python                             0x00000001000ca9bf PyEval_EvalFrameEx + 23919
    15  .Python                             0x00000001000cb2a6 PyEval_EvalFrameEx + 26198
    16  .Python                             0x00000001000cb2a6 PyEval_EvalFrameEx + 26198
 开发者_JAVA百科   17  .Python                             0x00000001000cc8c5 PyEval_EvalCodeEx + 1733
    18  .Python                             0x00000001000ca9bf PyEval_EvalFrameEx + 23919
    19  .Python                             0x00000001000cb2a6 PyEval_EvalFrameEx + 26198
    20  .Python                             0x00000001000cc8c5 PyEval_EvalCodeEx + 1733
    21  .Python                             0x00000001000ccbc6 PyEval_EvalCode + 54
    22  .Python                             0x00000001000f0c7e PyRun_FileExFlags + 174
    23  .Python                             0x00000001000f1aa1 PyRun_SimpleFileExFlags + 817
    24  .Python                             0x00000001001093d9 Py_Main + 2825
    25  Python                              0x0000000100000f54 0x0 + 4294971220
)
terminate called after throwing an instance of 'NSException'

It seems like a bug, but I do not know if the problem lies in matplotlib, in wxPython or in the backend_wx.py. What I did to fix it is that I looked in the backend_wx.py source code for the Toolbar and put it directly in my wxPython toolbar. So this works for me:

import os
import wx
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg, NavigationToolbar2WxAgg
from matplotlib.backends.backend_wx import _load_bitmap
import matplotlib as mpl


app = wx.PySimpleApp()
f = wx.Frame(None)
fig = mpl.figure.Figure()
p = FigureCanvasWxAgg(f, -1, fig)

toolbar = NavigationToolbar2WxAgg(p)
toolbar.Hide()

#toolbar constants
TBFLAGS = (wx.TB_HORIZONTAL|wx.TB_TEXT)      
tsize = (24,24)
tb = f.CreateToolBar(TBFLAGS)

_NTB2_HOME = wx.NewId()
_NTB2_BACK = wx.NewId()
_NTB2_FORWARD = wx.NewId()
_NTB2_PAN = wx.NewId()
_NTB2_ZOOM = wx.NewId()
_NTB2_SAVE = wx.NewId()
_NTB2_SUBPLOT = wx.NewId()

tb.AddSimpleTool(_NTB2_HOME, _load_bitmap('home.png'), 'Home', 'Reset original view')
tb.AddSimpleTool(_NTB2_BACK, _load_bitmap('back.png'), 'Back', 'Back navigation view')
tb.AddSimpleTool(_NTB2_FORWARD, _load_bitmap('forward.png'), 'Forward', 'Forward navigation view')

tb.AddCheckTool(_NTB2_PAN, _load_bitmap('move.png'), shortHelp='Pan', longHelp='Pan with left, zoom with right')
tb.AddCheckTool(_NTB2_ZOOM, _load_bitmap('zoom_to_rect.png'), shortHelp='Zoom', longHelp='Zoom to rectangle')

tb.AddSeparator()
tb.AddSimpleTool(_NTB2_SUBPLOT, _load_bitmap('subplots.png'), 'Configure subplots', 'Configure subplot parameters')
tb.AddSimpleTool(_NTB2_SAVE, _load_bitmap('filesave.png'), 'Save', 'Save plot contents to file')

f.Bind(wx.EVT_TOOL, toolbar.home, id=_NTB2_HOME)
f.Bind(wx.EVT_TOOL, toolbar.forward, id=_NTB2_FORWARD)
f.Bind(wx.EVT_TOOL, toolbar.back, id=_NTB2_BACK)
f.Bind(wx.EVT_TOOL, toolbar.zoom, id=_NTB2_ZOOM)
f.Bind(wx.EVT_TOOL, toolbar.pan, id=_NTB2_PAN)
f.Bind(wx.EVT_TOOL, toolbar.configure_subplot, id=_NTB2_SUBPLOT)
f.Bind(wx.EVT_TOOL, toolbar.save, id=_NTB2_SAVE)

tb.Realize()  

tb.Realize()
f.Show()
app.MainLoop()

This is a quick fix, but some one has to file a bug report for it I guess.