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#!/usr/bin/env python
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# encoding: utf-8
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"""
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Inputhook management for GUI event loop integration.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2009 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import ctypes
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import sys
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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def _dummy_mainloop(*args, **kw):
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pass
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class InputHookManager(object):
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"""Manage PyOS_InputHook for different GUI toolkits.
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This class installs various hooks under ``PyOSInputHook`` to handle
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GUI event loop integration.
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"""
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def __init__(self):
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self.PYFUNC = ctypes.PYFUNCTYPE(ctypes.c_int)
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self._apps = {}
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self._reset()
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def _reset(self):
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self._callback_pyfunctype = None
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self._callback = None
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self._installed = False
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self._current_gui = None
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def _hijack_wx(self):
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"""Hijack the wx mainloop so a user calling it won't cause badness."""
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import wx
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if hasattr(wx, '_core_'): core = getattr(wx, '_core_')
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elif hasattr(wx, '_core'): core = getattr(wx, '_core')
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else: raise AttributeError('Could not find wx core module')
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orig_mainloop = core.PyApp_MainLoop
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core.PyApp_MainLoop = _dummy_mainloop
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return orig_mainloop
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def _hijack_qt4(self):
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"""Hijack the qt4 mainloop so a user calling it won't cause badness."""
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from PyQt4 import QtGui, QtCore
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orig_mainloop = QtGui.qApp.exec_
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QtGui.qApp.exec_ = _dummy_mainloop
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QtGui.QApplication.exec_ = _dummy_mainloop
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QtCore.QCoreApplication.exec_ = _dummy_mainloop
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return orig_mainloop
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def _hijack_gtk(self):
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"""Hijack the gtk mainloop so a user calling it won't cause badness."""
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import gtk
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orig_mainloop = gtk.main
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gtk.mainloop = _dummy_mainloop
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gtk.main = _dummy_mainloop
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return orig_mainloop
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def _hijack_tk(self):
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"""Hijack the tk mainloop so a user calling it won't cause badness."""
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import Tkinter
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Tkinter.Misc.mainloop = _dummy_mainloop
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Tkinter.mainloop = _dummy_mainloop
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def get_pyos_inputhook(self):
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"""Return the current PyOS_InputHook as a ctypes.c_void_p."""
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return ctypes.c_void_p.in_dll(ctypes.pythonapi,"PyOS_InputHook")
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def get_pyos_inputhook_as_func(self):
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"""Return the current PyOS_InputHook as a ctypes.PYFUNCYPE."""
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return self.PYFUNC.in_dll(ctypes.pythonapi,"PyOS_InputHook")
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def set_inputhook(self, callback):
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"""Set PyOS_InputHook to callback and return the previous one."""
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self._callback = callback
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self._callback_pyfunctype = self.PYFUNC(callback)
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pyos_inputhook_ptr = self.get_pyos_inputhook()
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original = self.get_pyos_inputhook_as_func()
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pyos_inputhook_ptr.value = \
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ctypes.cast(self._callback_pyfunctype, ctypes.c_void_p).value
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self._installed = True
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return original
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def clear_inputhook(self):
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"""Set PyOS_InputHook to NULL and return the previous one."""
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pyos_inputhook_ptr = self.get_pyos_inputhook()
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original = self.get_pyos_inputhook_as_func()
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pyos_inputhook_ptr.value = ctypes.c_void_p(None).value
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self._reset()
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return original
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def clear_app_refs(self, gui=None):
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"""Clear IPython's internal reference to an application instance.
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Whenever we create an app for a user on qt4 or wx, we hold a
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reference to the app. This is needed because in some cases bad things
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can happen if a user doesn't hold a reference themselves. This
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method is provided to clear the references we are holding.
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Parameters
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----------
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gui : None or str
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If None, clear all app references. If ('wx', 'qt4') clear
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the app for that toolkit. References are not held for gtk or tk
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as those toolkits don't have the notion of an app.
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"""
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if gui is None:
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self._apps = {}
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elif self._apps.has_key(gui):
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del self._apps[gui]
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def enable_wx(self, app=False):
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"""Enable event loop integration with wxPython.
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Parameters
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----------
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app : bool
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Create a running application object or not.
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Notes
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-----
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This methods sets the ``PyOS_InputHook`` for wxPython, which allows
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the wxPython to integrate with terminal based applications like
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IPython.
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If ``app`` is True, we create an :class:`wx.App` as follows::
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import wx
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app = wx.App(redirect=False, clearSigInt=False)
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Both options this constructor are important for things to work
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properly in an interactive context.
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But, we first check to see if an application has already been
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created. If so, we simply return that instance.
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"""
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from IPython.lib.inputhookwx import inputhook_wx
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self.set_inputhook(inputhook_wx)
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self._current_gui = 'wx'
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self._hijack_wx()
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if app:
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import wx
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app = wx.GetApp()
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if app is None:
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app = wx.App(redirect=False, clearSigInt=False)
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self._apps['wx'] = app
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return app
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def disable_wx(self):
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"""Disable event loop integration with wxPython.
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This merely sets PyOS_InputHook to NULL.
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"""
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self.clear_inputhook()
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def enable_qt4(self, app=False):
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"""Enable event loop integration with PyQt4.
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Parameters
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----------
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app : bool
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Create a running application object or not.
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Notes
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-----
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This methods sets the PyOS_InputHook for PyQt4, which allows
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the PyQt4 to integrate with terminal based applications like
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IPython.
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If ``app`` is True, we create an :class:`QApplication` as follows::
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from PyQt4 import QtCore
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app = QtGui.QApplication(sys.argv)
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But, we first check to see if an application has already been
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created. If so, we simply return that instance.
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"""
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from PyQt4 import QtCore
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# PyQt4 has had this since 4.3.1. In version 4.2, PyOS_InputHook
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# was set when QtCore was imported, but if it ever got removed,
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# you couldn't reset it. For earlier versions we can
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# probably implement a ctypes version.
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try:
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QtCore.pyqtRestoreInputHook()
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except AttributeError:
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pass
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self._current_gui = 'qt4'
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self._hijack_qt4()
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if app:
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from PyQt4 import QtGui
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app = QtGui.QApplication.instance()
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if app is None:
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app = QtGui.QApplication(sys.argv)
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self._apps['qt4'] = app
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return app
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def disable_qt4(self):
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"""Disable event loop integration with PyQt4.
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This merely sets PyOS_InputHook to NULL.
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"""
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self.clear_inputhook()
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def enable_gtk(self, app=False):
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"""Enable event loop integration with PyGTK.
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Parameters
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----------
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app : bool
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Create a running application object or not. Because gtk does't
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have an app class, this does nothing.
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Notes
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-----
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This methods sets the PyOS_InputHook for PyGTK, which allows
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the PyGTK to integrate with terminal based applications like
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IPython.
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"""
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import gtk
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try:
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gtk.set_interactive(True)
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self._current_gui = 'gtk'
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except AttributeError:
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# For older versions of gtk, use our own ctypes version
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from IPython.lib.inputhookgtk import inputhook_gtk
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self.set_inputhook(inputhook_gtk)
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self._current_gui = 'gtk'
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self._hijack_gtk()
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def disable_gtk(self):
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"""Disable event loop integration with PyGTK.
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This merely sets PyOS_InputHook to NULL.
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"""
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self.clear_inputhook()
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def enable_tk(self, app=False):
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"""Enable event loop integration with Tk.
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Parameters
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----------
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app : bool
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Create a running application object or not.
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Notes
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-----
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Currently this is a no-op as creating a :class:`Tkinter.Tk` object
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sets ``PyOS_InputHook``.
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"""
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self._current_gui = 'tk'
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self._hijack_tk()
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def disable_tk(self):
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"""Disable event loop integration with Tkinter.
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This merely sets PyOS_InputHook to NULL.
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"""
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self.clear_inputhook()
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def current_gui(self):
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"""Return a string indicating the currently active GUI or None."""
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return self._current_gui
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inputhook_manager = InputHookManager()
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enable_wx = inputhook_manager.enable_wx
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disable_wx = inputhook_manager.disable_wx
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enable_qt4 = inputhook_manager.enable_qt4
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disable_qt4 = inputhook_manager.disable_qt4
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enable_gtk = inputhook_manager.enable_gtk
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disable_gtk = inputhook_manager.disable_gtk
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enable_tk = inputhook_manager.enable_tk
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disable_tk = inputhook_manager.disable_tk
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clear_inputhook = inputhook_manager.clear_inputhook
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set_inputhook = inputhook_manager.set_inputhook
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current_gui = inputhook_manager.current_gui
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clear_app_refs = inputhook_manager.clear_app_refs
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