wxPython/src/_app_ex.py

   1
   2 #----------------------------------------------------------------------
   3
   4 class PyOnDemandOutputWindow:
   5     """
   6     A class that can be used for redirecting Python's stdout and
   7     stderr streams.  It will do nothing until something is wrriten to
   8     the stream at which point it will create a Frame with a text area
   9     and write the text there.
  10     """
  11     def __init__(self, title = "wxPython: stdout/stderr"):
  12         self.frame  = None
  13         self.title  = title
  14         self.pos    = wx.DefaultPosition
  15         self.size   = (450, 300)
  16         self.parent = None
  17
  18     def SetParent(self, parent):
  19         """Set the window to be used as the popup Frame's parent."""
  20         self.parent = parent
  21
  22
  23     def CreateOutputWindow(self, st):
  24         self.frame = wx.Frame(self.parent, -1, self.title, self.pos, self.size,
  25                               style=wx.DEFAULT_FRAME_STYLE)
  26         self.text  = wx.TextCtrl(self.frame, -1, "",
  27                                  style=wx.TE_MULTILINE|wx.TE_READONLY)
  28         self.text.AppendText(st)
  29         self.frame.Show(True)
  30         self.frame.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
  31
  32
  33     def OnCloseWindow(self, event):
  34         if self.frame is not None:
  35             self.frame.Destroy()
  36         self.frame = None
  37         self.text  = None
  38
  39
  40     # These methods provide the file-like output behaviour.
  41     def write(self, text):
  42         """
  43         Create the output window if needed and write the string to it.
  44         If not called in the context of the gui thread then uses
  45         CallAfter to do the work there.
  46         """
  47         if self.frame is None:
  48             if not wx.Thread_IsMain():
  49                 wx.CallAfter(self.CreateOutputWindow, text)
  50             else:
  51                 self.CreateOutputWindow(text)
  52         else:
  53             if not wx.Thread_IsMain():
  54                 wx.CallAfter(self.text.AppendText, text)
  55             else:
  56                 self.text.AppendText(text)
  57
  58
  59     def close(self):
  60         if self.frame is not None:
  61             wx.CallAfter(self.frame.Close)
  62
  63
  64     def flush(self):
  65         pass
  66
  67
  68
  69 #----------------------------------------------------------------------
  70
  71 _defRedirect = (wx.Platform == '__WXMSW__' or wx.Platform == '__WXMAC__')
  72
  73 class App(wx.PyApp):
  74     """
  75     The ``wx.App`` class represents the application and is used to:
  76
  77       * bootstrap the wxPython system and initialize the underlying
  78         gui toolkit
  79       * set and get application-wide properties
  80       * implement the windowing system main message or event loop,
  81         and to dispatch events to window instances
  82       * etc.
  83
  84     Every application must have a ``wx.App`` instance, and all
  85     creation of UI objects should be delayed until after the
  86     ``wx.App`` object has been created in order to ensure that the gui
  87     platform and wxWidgets have been fully initialized.
  88
  89     Normally you would derive from this class and implement an
  90     ``OnInit`` method that creates a frame and then calls
  91     ``self.SetTopWindow(frame)``.
  92
  93     :see: `wx.PySimpleApp` for a simpler app class that can be used
  94            directly.
  95     """
  96
  97     outputWindowClass = PyOnDemandOutputWindow
  98
  99     def __init__(self, redirect=_defRedirect, filename=None,
 100                  useBestVisual=False, clearSigInt=True):
 101         """
 102         Construct a ``wx.App`` object.
 103
 104         :param redirect: Should ``sys.stdout`` and ``sys.stderr`` be
 105             redirected?  Defaults to True on Windows and Mac, False
 106             otherwise.  If `filename` is None then output will be
 107             redirected to a window that pops up as needed.  (You can
 108             control what kind of window is created for the output by
 109             resetting the class variable ``outputWindowClass`` to a
 110             class of your choosing.)
 111
 112         :param filename: The name of a file to redirect output to, if
 113             redirect is True.
 114
 115         :param useBestVisual: Should the app try to use the best
 116             available visual provided by the system (only relevant on
 117             systems that have more than one visual.)  This parameter
 118             must be used instead of calling `SetUseBestVisual` later
 119             on because it must be set before the underlying GUI
 120             toolkit is initialized.
 121
 122         :param clearSigInt: Should SIGINT be cleared?  This allows the
 123             app to terminate upon a Ctrl-C in the console like other
 124             GUI apps will.
 125
 126         :note: You should override OnInit to do applicaition
 127             initialization to ensure that the system, toolkit and
 128             wxWidgets are fully initialized.
 129         """
 130
 131         wx.PyApp.__init__(self)
 132
 133         # make sure we can create a GUI
 134         if not self.IsDisplayAvailable():
 135
 136             if wx.Platform == "__WXMAC__":
 137                 msg = """This program needs access to the screen.
 138 Please run with 'pythonw', not 'python', and only when you are logged
 139 in on the main display of your Mac."""
 140
 141             elif wx.Platform == "__WXGTK__":
 142                 msg ="Unable to access the X Display, is $DISPLAY set properly?"
 143
 144             else:
 145                 msg = "Unable to create GUI"
 146                 # TODO: more description is needed for wxMSW...
 147
 148             raise SystemExit(msg)
 149
 150         # This has to be done before OnInit
 151         self.SetUseBestVisual(useBestVisual)
 152
 153         # Set the default handler for SIGINT.  This fixes a problem
 154         # where if Ctrl-C is pressed in the console that started this
 155         # app then it will not appear to do anything, (not even send
 156         # KeyboardInterrupt???)  but will later segfault on exit.  By
 157         # setting the default handler then the app will exit, as
 158         # expected (depending on platform.)
 159         if clearSigInt:
 160             try:
 161                 import signal
 162                 signal.signal(signal.SIGINT, signal.SIG_DFL)
 163             except:
 164                 pass
 165
 166         # Save and redirect the stdio to a window?
 167         self.stdioWin = None
 168         self.saveStdio = (_sys.stdout, _sys.stderr)
 169         if redirect:
 170             self.RedirectStdio(filename)
 171
 172         # Use Python's install prefix as the default
 173         wx.StandardPaths.Get().SetInstallPrefix(_sys.prefix)
 174
 175         # This finishes the initialization of wxWindows and then calls
 176         # the OnInit that should be present in the derived class
 177         self._BootstrapApp()
 178
 179
 180     def OnPreInit(self):
 181         """
 182         Things that must be done after _BootstrapApp has done its
 183         thing, but would be nice if they were already done by the time
 184         that OnInit is called.
 185         """
 186         wx.StockGDI._initStockObjects()
 187
 188
 189     def __del__(self, destroy=wx.PyApp.__del__):
 190         self.RestoreStdio()  # Just in case the MainLoop was overridden
 191         destroy(self)
 192
 193     def Destroy(self):
 194         wx.PyApp.Destroy(self)
 195         self.thisown = 0
 196
 197     def SetTopWindow(self, frame):
 198         """Set the \"main\" top level window"""
 199         if self.stdioWin:
 200             self.stdioWin.SetParent(frame)
 201         wx.PyApp.SetTopWindow(self, frame)
 202
 203
 204     def MainLoop(self):
 205         """Execute the main GUI event loop"""
 206         wx.PyApp.MainLoop(self)
 207         self.RestoreStdio()
 208
 209
 210     def RedirectStdio(self, filename=None):
 211         """Redirect sys.stdout and sys.stderr to a file or a popup window."""
 212         if filename:
 213             _sys.stdout = _sys.stderr = open(filename, 'a')
 214         else:
 215             self.stdioWin = self.outputWindowClass()
 216             _sys.stdout = _sys.stderr = self.stdioWin
 217
 218
 219     def RestoreStdio(self):
 220         try:
 221             _sys.stdout, _sys.stderr = self.saveStdio
 222         except:
 223             pass
 224
 225
 226     def SetOutputWindowAttributes(self, title=None, pos=None, size=None):
 227         """
 228         Set the title, position and/or size of the output window if
 229         the stdio has been redirected.  This should be called before
 230         any output would cause the output window to be created.
 231         """
 232         if self.stdioWin:
 233             if title is not None:
 234                 self.stdioWin.title = title
 235             if pos is not None:
 236                 self.stdioWin.pos = pos
 237             if size is not None:
 238                 self.stdioWin.size = size
 239
 240
 241
 242
 243 # change from wx.PyApp_XX to wx.App_XX
 244 App_GetMacSupportPCMenuShortcuts = _core_.PyApp_GetMacSupportPCMenuShortcuts
 245 App_GetMacAboutMenuItemId        = _core_.PyApp_GetMacAboutMenuItemId
 246 App_GetMacPreferencesMenuItemId  = _core_.PyApp_GetMacPreferencesMenuItemId
 247 App_GetMacExitMenuItemId         = _core_.PyApp_GetMacExitMenuItemId
 248 App_GetMacHelpMenuTitleName      = _core_.PyApp_GetMacHelpMenuTitleName
 249 App_SetMacSupportPCMenuShortcuts = _core_.PyApp_SetMacSupportPCMenuShortcuts
 250 App_SetMacAboutMenuItemId        = _core_.PyApp_SetMacAboutMenuItemId
 251 App_SetMacPreferencesMenuItemId  = _core_.PyApp_SetMacPreferencesMenuItemId
 252 App_SetMacExitMenuItemId         = _core_.PyApp_SetMacExitMenuItemId
 253 App_SetMacHelpMenuTitleName      = _core_.PyApp_SetMacHelpMenuTitleName
 254 App_GetComCtl32Version           = _core_.PyApp_GetComCtl32Version
 255
 256 #----------------------------------------------------------------------------
 257
 258 class PySimpleApp(wx.App):
 259     """
 260     A simple application class.  You can just create one of these and
 261     then then make your top level windows later, and not have to worry
 262     about OnInit.  For example::
 263
 264         app = wx.PySimpleApp()
 265         frame = wx.Frame(None, title='Hello World')
 266         frame.Show()
 267         app.MainLoop()
 268
 269     :see: `wx.App`
 270     """
 271
 272     def __init__(self, redirect=False, filename=None,
 273                  useBestVisual=False, clearSigInt=True):
 274         """
 275         :see: `wx.App.__init__`
 276         """
 277         wx.App.__init__(self, redirect, filename, useBestVisual, clearSigInt)
 278
 279     def OnInit(self):
 280         return True
 281
 282
 283
 284 # Is anybody using this one?
 285 class PyWidgetTester(wx.App):
 286     def __init__(self, size = (250, 100)):
 287         self.size = size
 288         wx.App.__init__(self, 0)
 289
 290     def OnInit(self):
 291         self.frame = wx.Frame(None, -1, "Widget Tester", pos=(0,0), size=self.size)
 292         self.SetTopWindow(self.frame)
 293         return True
 294
 295     def SetWidget(self, widgetClass, *args, **kwargs):
 296         w = widgetClass(self.frame, *args, **kwargs)
 297         self.frame.Show(True)
 298
 299 #----------------------------------------------------------------------------
 300 # DO NOT hold any other references to this object.  This is how we
 301 # know when to cleanup system resources that wxWidgets is holding.  When
 302 # the sys module is unloaded, the refcount on sys.__wxPythonCleanup
 303 # goes to zero and it calls the wx.App_CleanUp function.
 304
 305 class __wxPyCleanup:
 306     def __init__(self):
 307         self.cleanup = _core_.App_CleanUp
 308     def __del__(self):
 309         self.cleanup()
 310
 311 _sys.__wxPythonCleanup = __wxPyCleanup()
 312
 313 ## # another possible solution, but it gets called too early...
 314 ## import atexit
 315 ## atexit.register(_core_.wxApp_CleanUp)
 316
 317
 318 #----------------------------------------------------------------------------