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.
 100     """
 101     app = wx.GetApp()
 102     assert app, 'No wxApp created yet'
 103
 104     global _wxPyCallAfterId
 105     if _wxPyCallAfterId is None:
 106         _wxPyCallAfterId = wx.NewEventType()
 107         app.Connect(-1, -1, _wxPyCallAfterId,
 108               lambda event: event.callable(*event.args, **event.kw) )
 109     evt = wx.PyEvent()
 110     evt.SetEventType(_wxPyCallAfterId)
 111     evt.callable = callable
 112     evt.args = args
 113     evt.kw = kw
 114     wx.PostEvent(app, evt)
 115
 116
 117 #----------------------------------------------------------------------------
 118
 119
 120 class FutureCall:
 121     """
 122     A convenience class for wx.Timer, that calls the given callable
 123     object once after the given amount of milliseconds, passing any
 124     positional or keyword args.  The return value of the callable is
 125     availbale after it has been run with the GetResult method.
 126
 127     If you don't need to get the return value or restart the timer
 128     then there is no need to hold a reference to this object.  It will
 129     hold a reference to itself while the timer is running (the timer
 130     has a reference to self.Notify) but the cycle will be broken when
 131     the timer completes, automatically cleaning up the wx.FutureCall
 132     object.
 133     """
 134     def __init__(self, millis, callable, *args, **kwargs):
 135         self.millis = millis
 136         self.callable = callable
 137         self.SetArgs(*args, **kwargs)
 138         self.runCount = 0
 139         self.running = False
 140         self.hasRun = False
 141         self.result = None
 142         self.timer = None
 143         self.Start()
 144
 145     def __del__(self):
 146         self.Stop()
 147
 148
 149     def Start(self, millis=None, *args, **kwargs):
 150         """
 151         (Re)start the timer
 152         """
 153         self.hasRun = False
 154         if millis is not None:
 155             self.millis = millis
 156         if args or kwargs:
 157             self.SetArgs(*args, **kwargs)
 158         self.Stop()
 159         self.timer = wx.PyTimer(self.Notify)
 160         self.timer.Start(self.millis, wx.TIMER_ONE_SHOT)
 161         self.running = True
 162     Restart = Start
 163
 164
 165     def Stop(self):
 166         """
 167         Stop and destroy the timer.
 168         """
 169         if self.timer is not None:
 170             self.timer.Stop()
 171             self.timer = None
 172
 173
 174     def GetInterval(self):
 175         if self.timer is not None:
 176             return self.timer.GetInterval()
 177         else:
 178             return 0
 179
 180
 181     def IsRunning(self):
 182         return self.timer is not None and self.timer.IsRunning()
 183
 184
 185     def SetArgs(self, *args, **kwargs):
 186         """
 187         (Re)set the args passed to the callable object.  This is
 188         useful in conjunction with Restart if you want to schedule a
 189         new call to the same callable object but with different
 190         parameters.
 191         """
 192         self.args = args
 193         self.kwargs = kwargs
 194
 195
 196     def HasRun(self):
 197         return self.hasRun
 198
 199     def GetResult(self):
 200         return self.result
 201
 202     def Notify(self):
 203         """
 204         The timer has expired so call the callable.
 205         """
 206         if self.callable and getattr(self.callable, 'im_self', True):
 207             self.runCount += 1
 208             self.running = False
 209             self.result = self.callable(*self.args, **self.kwargs)
 210         self.hasRun = True
 211         if not self.running:
 212             # if it wasn't restarted, then cleanup
 213             wx.CallAfter(self.Stop)
 214
 215
 216 #----------------------------------------------------------------------------
 217 #----------------------------------------------------------------------------
 218
 219 # Import other modules in this package that should show up in the
 220 # "core" wx namespace
 221 from gdi import *
 222 from windows import *
 223 from controls import *
 224 from misc import *
 225
 226
 227 # Fixup the stock objects since they can't be used yet.  (They will be
 228 # restored in wx.PyApp.OnInit.)
 229 _core._wxPyFixStockObjects()
 230
 231 #----------------------------------------------------------------------------
 232 #----------------------------------------------------------------------------