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         EVT_CLOSE(self.frame, 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         wx.PyApp.__init__(self)
 131
 132         if wx.Platform == "__WXMAC__":
 133             try:
 134                 import MacOS
 135                 if not MacOS.WMAvailable():
 136                     print """\
 137 This program needs access to the screen. Please run with 'pythonw',
 138 not 'python', and only when you are logged in on the main display of
 139 your Mac."""
 140                     _sys.exit(1)
 141             except SystemExit:
 142                 raise
 143             except:
 144                 pass
 145
 146         # This has to be done before OnInit
 147         self.SetUseBestVisual(useBestVisual)
 148
 149         # Set the default handler for SIGINT.  This fixes a problem
 150         # where if Ctrl-C is pressed in the console that started this
 151         # app then it will not appear to do anything, (not even send
 152         # KeyboardInterrupt???)  but will later segfault on exit.  By
 153         # setting the default handler then the app will exit, as
 154         # expected (depending on platform.)
 155         if clearSigInt:
 156             try:
 157                 import signal
 158                 signal.signal(signal.SIGINT, signal.SIG_DFL)
 159             except:
 160                 pass
 161
 162         # Save and redirect the stdio to a window?
 163         self.stdioWin = None
 164         self.saveStdio = (_sys.stdout, _sys.stderr)
 165         if redirect:
 166             self.RedirectStdio(filename)
 167
 168         # This finishes the initialization of wxWindows and then calls
 169         # the OnInit that should be present in the derived class
 170         self._BootstrapApp()
 171
 172
 173     def __del__(self):
 174         try:
 175             self.RestoreStdio()  # Just in case the MainLoop was overridden
 176         except:
 177             pass
 178
 179
 180     def SetTopWindow(self, frame):
 181         """Set the \"main\" top level window"""
 182         if self.stdioWin:
 183             self.stdioWin.SetParent(frame)
 184         wx.PyApp.SetTopWindow(self, frame)
 185
 186
 187     def MainLoop(self):
 188         """Execute the main GUI event loop"""
 189         wx.PyApp.MainLoop(self)
 190         self.RestoreStdio()
 191
 192
 193     def RedirectStdio(self, filename=None):
 194         """Redirect sys.stdout and sys.stderr to a file or a popup window."""
 195         if filename:
 196             _sys.stdout = _sys.stderr = open(filename, 'a')
 197         else:
 198             self.stdioWin = self.outputWindowClass()
 199             _sys.stdout = _sys.stderr = self.stdioWin
 200
 201
 202     def RestoreStdio(self):
 203         _sys.stdout, _sys.stderr = self.saveStdio
 204
 205
 206     def SetOutputWindowAttributes(self, title=None, pos=None, size=None):
 207         """
 208         Set the title, position and/or size of the output window if
 209         the stdio has been redirected.  This should be called before
 210         any output would cause the output window to be created.
 211         """
 212         if self.stdioWin:
 213             if title is not None:
 214                 self.stdioWin.title = title
 215             if pos is not None:
 216                 self.stdioWin.pos = pos
 217             if size is not None:
 218                 self.stdioWin.size = size
 219
 220
 221
 222
 223 # change from wx.PyApp_XX to wx.App_XX
 224 App_GetMacSupportPCMenuShortcuts = _core_.PyApp_GetMacSupportPCMenuShortcuts
 225 App_GetMacAboutMenuItemId        = _core_.PyApp_GetMacAboutMenuItemId
 226 App_GetMacPreferencesMenuItemId  = _core_.PyApp_GetMacPreferencesMenuItemId
 227 App_GetMacExitMenuItemId         = _core_.PyApp_GetMacExitMenuItemId
 228 App_GetMacHelpMenuTitleName      = _core_.PyApp_GetMacHelpMenuTitleName
 229 App_SetMacSupportPCMenuShortcuts = _core_.PyApp_SetMacSupportPCMenuShortcuts
 230 App_SetMacAboutMenuItemId        = _core_.PyApp_SetMacAboutMenuItemId
 231 App_SetMacPreferencesMenuItemId  = _core_.PyApp_SetMacPreferencesMenuItemId
 232 App_SetMacExitMenuItemId         = _core_.PyApp_SetMacExitMenuItemId
 233 App_SetMacHelpMenuTitleName      = _core_.PyApp_SetMacHelpMenuTitleName
 234 App_GetComCtl32Version           = _core_.PyApp_GetComCtl32Version
 235
 236 #----------------------------------------------------------------------------
 237
 238 class PySimpleApp(wx.App):
 239     """
 240     A simple application class.  You can just create one of these and
 241     then then make your top level windows later, and not have to worry
 242     about OnInit.  For example::
 243
 244         app = wx.PySimpleApp()
 245         frame = wx.Frame(None, title='Hello World')
 246         frame.Show()
 247         app.MainLoop()
 248
 249     :see: `wx.App`
 250     """
 251
 252     def __init__(self, redirect=False, filename=None,
 253                  useBestVisual=False, clearSigInt=True):
 254         """
 255         :see: `wx.App.__init__`
 256         """
 257         wx.App.__init__(self, redirect, filename, useBestVisual, clearSigInt)
 258
 259     def OnInit(self):
 260         return True
 261
 262
 263
 264 # Is anybody using this one?
 265 class PyWidgetTester(wx.App):
 266     def __init__(self, size = (250, 100)):
 267         self.size = size
 268         wx.App.__init__(self, 0)
 269
 270     def OnInit(self):
 271         self.frame = wx.Frame(None, -1, "Widget Tester", pos=(0,0), size=self.size)
 272         self.SetTopWindow(self.frame)
 273         return True
 274
 275     def SetWidget(self, widgetClass, *args, **kwargs):
 276         w = widgetClass(self.frame, *args, **kwargs)
 277         self.frame.Show(True)
 278
 279 #----------------------------------------------------------------------------
 280 # DO NOT hold any other references to this object.  This is how we
 281 # know when to cleanup system resources that wxWidgets is holding.  When
 282 # the sys module is unloaded, the refcount on sys.__wxPythonCleanup
 283 # goes to zero and it calls the wx.App_CleanUp function.
 284
 285 class __wxPyCleanup:
 286     def __init__(self):
 287         self.cleanup = _core_.App_CleanUp
 288     def __del__(self):
 289         self.cleanup()
 290
 291 _sys.__wxPythonCleanup = __wxPyCleanup()
 292
 293 ## # another possible solution, but it gets called too early...
 294 ## import atexit
 295 ## atexit.register(_core_.wxApp_CleanUp)
 296
 297
 298 #----------------------------------------------------------------------------