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