wxPython/src/_core_ex.py

   1 #----------------------------------------------------------------------------
   2
   3 # Use Python's bool constants if available, make some if not
   4 try:
   5     True
   6 except NameError:
   7     __builtins__.True = 1==1
   8     __builtins__.False = 1==0
   9     def bool(value): return not not value
  10     __builtins__.bool = bool
  11
  12
  13
  14 # workarounds for bad wxRTTI names
  15 __wxPyPtrTypeMap['wxGauge95']    = 'wxGauge'
  16 __wxPyPtrTypeMap['wxSlider95']   = 'wxSlider'
  17 __wxPyPtrTypeMap['wxStatusBar95']   = 'wxStatusBar'
  18
  19
  20 #----------------------------------------------------------------------------
  21 # Load version numbers from __version__...  Ensure that major and minor
  22 # versions are the same for both wxPython and wxWidgets.
  23
  24 from __version__ import *
  25 __version__ = VERSION_STRING
  26
  27 assert MAJOR_VERSION == _core_.MAJOR_VERSION, "wxPython/wxWidgets version mismatch"
  28 assert MINOR_VERSION == _core_.MINOR_VERSION, "wxPython/wxWidgets version mismatch"
  29 if RELEASE_VERSION != _core_.RELEASE_VERSION:
  30     import warnings
  31     warnings.warn("wxPython/wxWidgets release number mismatch")
  32
  33 #----------------------------------------------------------------------------
  34
  35 # Set wxPython's default string<-->unicode conversion encoding from
  36 # the locale, but only if Python's default hasn't been changed.  (We
  37 # assume that if the user has customized it already then that is the
  38 # encoding we need to use as well.)
  39 #
  40 # The encoding selected here is used when string or unicode objects
  41 # need to be converted in order to pass them to wxWidgets.  Please be
  42 # aware that the default encoding within the same locale may be
  43 # slightly different on different platforms.  For example, please see
  44 # http://www.alanwood.net/demos/charsetdiffs.html for differences
  45 # between the common latin/roman encodings.
  46
  47 default = _sys.getdefaultencoding()
  48 if default == 'ascii':
  49     import locale
  50     import codecs
  51     try:
  52         default = locale.getdefaultlocale()[1]
  53         codecs.lookup(default)
  54     except (ValueError, LookupError, TypeError):
  55         default = _sys.getdefaultencoding()
  56     del locale
  57     del codecs
  58 if default:
  59     wx.SetDefaultPyEncoding(default)
  60 del default
  61
  62 #----------------------------------------------------------------------------
  63
  64 class PyDeadObjectError(AttributeError):
  65     pass
  66
  67 class _wxPyDeadObject(object):
  68     """
  69     Instances of wx objects that are OOR capable will have their __class__
  70     changed to this class when the C++ object is deleted.  This should help
  71     prevent crashes due to referencing a bogus C++ pointer.
  72     """
  73     reprStr = "wxPython wrapper for DELETED %s object! (The C++ object no longer exists.)"
  74     attrStr = "The C++ part of the %s object has been deleted, attribute access no longer allowed."
  75
  76     def __repr__(self):
  77         if not hasattr(self, "_name"):
  78             self._name = "[unknown]"
  79         return self.reprStr % self._name
  80
  81     def __getattr__(self, *args):
  82         if not hasattr(self, "_name"):
  83             self._name = "[unknown]"
  84         raise PyDeadObjectError(self.attrStr % self._name)
  85
  86     def __nonzero__(self):
  87         return 0
  88
  89
  90
  91 class PyUnbornObjectError(AttributeError):
  92     pass
  93
  94 class _wxPyUnbornObject(object):
  95     """
  96     Some stock objects are created when the wx._core module is
  97     imported, but their C++ instance is not created until the wx.App
  98     object is created and initialized.  These object instances will
  99     temporarily have their __class__ changed to this class so an
 100     exception will be raised if they are used before the C++ instance
 101     is ready.
 102     """
 103
 104     reprStr = "wxPython wrapper for UNBORN object! (The C++ object is not initialized yet.)"
 105     attrStr = "The C++ part of this object has not been initialized, attribute access not allowed."
 106
 107     def __repr__(self):
 108         #if not hasattr(self, "_name"):
 109         #    self._name = "[unknown]"
 110         return self.reprStr #% self._name
 111
 112     def __getattr__(self, *args):
 113         #if not hasattr(self, "_name"):
 114         #    self._name = "[unknown]"
 115         raise PyUnbornObjectError(self.attrStr) # % self._name )
 116
 117     def __nonzero__(self):
 118         return 0
 119
 120
 121 #----------------------------------------------------------------------------
 122
 123 def CallAfter(callable, *args, **kw):
 124     """
 125     Call the specified function after the current and pending event
 126     handlers have been completed.  This is also good for making GUI
 127     method calls from non-GUI threads.  Any extra positional or
 128     keyword args are passed on to the callable when it is called.
 129
 130     :see: `wx.FutureCall`
 131     """
 132     app = wx.GetApp()
 133     assert app is not None, 'No wx.App created yet'
 134
 135     if not hasattr(app, "_CallAfterId"):
 136         app._CallAfterId = wx.NewEventType()
 137         app.Connect(-1, -1, app._CallAfterId,
 138                     lambda event: event.callable(*event.args, **event.kw) )
 139     evt = wx.PyEvent()
 140     evt.SetEventType(app._CallAfterId)
 141     evt.callable = callable
 142     evt.args = args
 143     evt.kw = kw
 144     wx.PostEvent(app, evt)
 145
 146 #----------------------------------------------------------------------------
 147
 148
 149 class FutureCall:
 150     """
 151     A convenience class for `wx.Timer`, that calls the given callable
 152     object once after the given amount of milliseconds, passing any
 153     positional or keyword args.  The return value of the callable is
 154     availbale after it has been run with the `GetResult` method.
 155
 156     If you don't need to get the return value or restart the timer
 157     then there is no need to hold a reference to this object.  It will
 158     hold a reference to itself while the timer is running (the timer
 159     has a reference to self.Notify) but the cycle will be broken when
 160     the timer completes, automatically cleaning up the wx.FutureCall
 161     object.
 162
 163     :see: `wx.CallAfter`
 164     """
 165     def __init__(self, millis, callable, *args, **kwargs):
 166         self.millis = millis
 167         self.callable = callable
 168         self.SetArgs(*args, **kwargs)
 169         self.runCount = 0
 170         self.running = False
 171         self.hasRun = False
 172         self.result = None
 173         self.timer = None
 174         self.Start()
 175
 176     def __del__(self):
 177         self.Stop()
 178
 179
 180     def Start(self, millis=None, *args, **kwargs):
 181         """
 182         (Re)start the timer
 183         """
 184         self.hasRun = False
 185         if millis is not None:
 186             self.millis = millis
 187         if args or kwargs:
 188             self.SetArgs(*args, **kwargs)
 189         self.Stop()
 190         self.timer = wx.PyTimer(self.Notify)
 191         self.timer.Start(self.millis, wx.TIMER_ONE_SHOT)
 192         self.running = True
 193     Restart = Start
 194
 195
 196     def Stop(self):
 197         """
 198         Stop and destroy the timer.
 199         """
 200         if self.timer is not None:
 201             self.timer.Stop()
 202             self.timer = None
 203
 204
 205     def GetInterval(self):
 206         if self.timer is not None:
 207             return self.timer.GetInterval()
 208         else:
 209             return 0
 210
 211
 212     def IsRunning(self):
 213         return self.timer is not None and self.timer.IsRunning()
 214
 215
 216     def SetArgs(self, *args, **kwargs):
 217         """
 218         (Re)set the args passed to the callable object.  This is
 219         useful in conjunction with Restart if you want to schedule a
 220         new call to the same callable object but with different
 221         parameters.
 222         """
 223         self.args = args
 224         self.kwargs = kwargs
 225
 226
 227     def HasRun(self):
 228         return self.hasRun
 229
 230     def GetResult(self):
 231         return self.result
 232
 233     def Notify(self):
 234         """
 235         The timer has expired so call the callable.
 236         """
 237         if self.callable and getattr(self.callable, 'im_self', True):
 238             self.runCount += 1
 239             self.running = False
 240             self.result = self.callable(*self.args, **self.kwargs)
 241         self.hasRun = True
 242         if not self.running:
 243             # if it wasn't restarted, then cleanup
 244             wx.CallAfter(self.Stop)
 245
 246
 247
 248 #----------------------------------------------------------------------------
 249 # Control which items in this module should be documented by epydoc.
 250 # We allow only classes and functions, which will help reduce the size
 251 # of the docs by filtering out the zillions of constants, EVT objects,
 252 # and etc that don't make much sense by themselves, but are instead
 253 # documented (or will be) as part of the classes/functions/methods
 254 # where they should be used.
 255
 256 class __DocFilter:
 257     """
 258     A filter for epydoc that only allows non-Ptr classes and
 259     fucntions, in order to reduce the clutter in the API docs.
 260     """
 261     def __init__(self, globals):
 262         self._globals = globals
 263
 264     def __call__(self, name):
 265         import types
 266         obj = self._globals.get(name, None)
 267         if type(obj) not in [type, types.ClassType, types.FunctionType, types.BuiltinFunctionType]:
 268             return False
 269         if name.startswith('_') or name.endswith('Ptr') or name.startswith('EVT'):
 270             return False
 271         return True
 272
 273 #----------------------------------------------------------------------------
 274 #----------------------------------------------------------------------------
 275
 276 # Import other modules in this package that should show up in the
 277 # "core" wx namespace
 278 from _gdi import *
 279 from _windows import *
 280 from _controls import *
 281 from _misc import *
 282
 283
 284 # Fixup the stock objects since they can't be used yet.  (They will be
 285 # restored in wx.PyApp.OnInit.)
 286 _core_._wxPyFixStockObjects()
 287
 288 #----------------------------------------------------------------------------
 289 #----------------------------------------------------------------------------