matplotlib navtoolbar 在 wx 2.9 (Mac OS X) 中无法实现

Question

以下代码在 wxPython 2.8.x、Python 2.5.4/2.6、Matplotlib 0.99.x 上运行时，按预期在框架顶部生成 matplotlib NavToolbar2。

不过，我最近转向了 Python 2.7 和 wxPython 2.9.1，试图支持 64 位的 OS X。正是在这种环境下，下面的代码会生成一个空工具栏：

我注意到在构建 matplotlib 时它说了一些关于 not wx 2.9 及更高版本需要 WxAgg，这可能是问题所在吗？到目前为止，我所尝试的只是将 FigureCanvasWxAgg 替换为 FigureCanvasWx，将 NavigationToolbar2WxAgg 替换为 NavigationToolbar2Wx。运气不好。

有什么想法吗？

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()

还有一件事......如果我用我自己的自定义导航工具栏类替换 NavigationToolbar2WxAgg （此线程上第一个答案的代码： 在 matplotlib 中添加新的导航模式），除非我删除 tb.Realize()，否则整个系统都会崩溃。

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
    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'

Answer 1

这看起来像是一个错误，但我不知道问题是否出在 matplotlib、wxPython 或 backend_wx.py 中。我修复它的方法是查看 backend_wx.py 源代码 工具栏并将其直接放在我的 wxPython 工具栏中。所以这对我有用：

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()

这是一个快速修复，但我猜有人必须为此提交一份错误报告。