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# coding: 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) 2008-2011 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 os
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import sys
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import warnings
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#-----------------------------------------------------------------------------
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# Constants
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#-----------------------------------------------------------------------------
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# Constants for identifying the GUI toolkits.
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GUI_WX = 'wx'
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GUI_QT = 'qt'
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GUI_QT4 = 'qt4'
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GUI_GTK = 'gtk'
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GUI_TK = 'tk'
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GUI_OSX = 'osx'
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GUI_GLUT = 'glut'
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GUI_PYGLET = 'pyglet'
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GUI_NONE = 'none' # i.e. disable
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#-----------------------------------------------------------------------------
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# Utilities
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#-----------------------------------------------------------------------------
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def _stdin_ready_posix():
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"""Return True if there's something to read on stdin (posix version)."""
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infds, outfds, erfds = select.select([sys.stdin],[],[],0)
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return bool(infds)
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def _stdin_ready_nt():
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"""Return True if there's something to read on stdin (nt version)."""
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return msvcrt.kbhit()
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def _stdin_ready_other():
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"""Return True, assuming there's something to read on stdin."""
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return True #
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def _ignore_CTRL_C_posix():
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"""Ignore CTRL+C (SIGINT)."""
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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def _allow_CTRL_C_posix():
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"""Take CTRL+C into account (SIGINT)."""
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signal.signal(signal.SIGINT, signal.default_int_handler)
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def _ignore_CTRL_C_other():
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"""Ignore CTRL+C (not implemented)."""
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pass
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def _allow_CTRL_C_other():
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"""Take CTRL+C into account (not implemented)."""
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pass
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if os.name == 'posix':
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import select
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import signal
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stdin_ready = _stdin_ready_posix
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ignore_CTRL_C = _ignore_CTRL_C_posix
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allow_CTRL_C = _allow_CTRL_C_posix
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elif os.name == 'nt':
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import msvcrt
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stdin_ready = _stdin_ready_nt
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ignore_CTRL_C = _ignore_CTRL_C_other
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allow_CTRL_C = _allow_CTRL_C_other
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else:
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stdin_ready = _stdin_ready_other
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ignore_CTRL_C = _ignore_CTRL_C_other
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allow_CTRL_C = _allow_CTRL_C_other
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#-----------------------------------------------------------------------------
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# Main InputHookManager class
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#-----------------------------------------------------------------------------
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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 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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# On platforms with 'readline' support, it's all too likely to
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# have a KeyboardInterrupt signal delivered *even before* an
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# initial ``try:`` clause in the callback can be executed, so
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# we need to disable CTRL+C in this situation.
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ignore_CTRL_C()
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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, app=None):
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"""Set PyOS_InputHook to NULL and return the previous one.
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Parameters
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----------
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app : optional, ignored
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This parameter is allowed only so that clear_inputhook() can be
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called with a similar interface as all the ``enable_*`` methods. But
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the actual value of the parameter is ignored. This uniform interface
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makes it easier to have user-level entry points in the main IPython
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app like :meth:`enable_gui`."""
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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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allow_CTRL_C()
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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=None):
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"""Enable event loop integration with wxPython.
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Parameters
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----------
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app : WX Application, optional.
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Running application to use. If not given, we probe WX for an
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existing application object, and create a new one if none is found.
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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 not given we probe for an existing one, and return it if
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found. If no existing app is found, we create an :class:`wx.App` as
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follows::
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import wx
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app = wx.App(redirect=False, clearSigInt=False)
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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 = GUI_WX
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import wx
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if app is None:
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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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app._in_event_loop = True
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self._apps[GUI_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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if self._apps.has_key(GUI_WX):
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self._apps[GUI_WX]._in_event_loop = False
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self.clear_inputhook()
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def enable_qt4(self, app=None):
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"""Enable event loop integration with PyQt4.
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Parameters
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----------
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app : Qt Application, optional.
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Running application to use. If not given, we probe Qt for an
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existing application object, and create a new one if none is found.
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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 not given we probe for an existing one, and return it if
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found. If no existing app is found, we create an :class:`QApplication`
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as follows::
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from PyQt4 import QtCore
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app = QtGui.QApplication(sys.argv)
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"""
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from IPython.lib.inputhookqt4 import create_inputhook_qt4
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app, inputhook_qt4 = create_inputhook_qt4(self, app)
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self.set_inputhook(inputhook_qt4)
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self._current_gui = GUI_QT4
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app._in_event_loop = True
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self._apps[GUI_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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if self._apps.has_key(GUI_QT4):
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self._apps[GUI_QT4]._in_event_loop = False
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self.clear_inputhook()
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def enable_gtk(self, app=None):
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"""Enable event loop integration with PyGTK.
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Parameters
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----------
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app : ignored
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Ignored, it's only a placeholder to keep the call signature of all
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gui activation methods consistent, which simplifies the logic of
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supporting magics.
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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 = 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 = GUI_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=None):
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"""Enable event loop integration with Tk.
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Parameters
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----------
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app : toplevel :class:`Tkinter.Tk` widget, optional.
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Running toplevel widget to use. If not given, we probe Tk for an
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existing one, and create a new one if none is found.
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Notes
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-----
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If you have already created a :class:`Tkinter.Tk` object, the only
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thing done by this method is to register with the
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:class:`InputHookManager`, since creating that object automatically
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sets ``PyOS_InputHook``.
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"""
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self._current_gui = GUI_TK
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if app is None:
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import Tkinter
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app = Tkinter.Tk()
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app.withdraw()
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self._apps[GUI_TK] = app
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return app
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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 enable_glut(self, app=None):
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""" Enable event loop integration with GLUT.
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Parameters
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----------
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app : ignored
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Ignored, it's only a placeholder to keep the call signature of all
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gui activation methods consistent, which simplifies the logic of
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supporting magics.
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Notes
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-----
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This methods sets the PyOS_InputHook for GLUT, which allows the GLUT to
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integrate with terminal based applications like IPython. Due to GLUT
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limitations, it is currently not possible to start the event loop
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without first creating a window. You should thus not create another
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window but use instead the created one. See 'gui-glut.py' in the
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docs/examples/lib directory.
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The default screen mode is set to:
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glut.GLUT_DOUBLE | glut.GLUT_RGBA | glut.GLUT_DEPTH
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"""
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import OpenGL.GLUT as glut
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from IPython.lib.inputhookglut import glut_display_mode, \
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glut_close, glut_display, \
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glut_idle, inputhook_glut
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if not self._apps.has_key( GUI_GLUT ):
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glut.glutInit( sys.argv )
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glut.glutInitDisplayMode( glut_display_mode )
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# This is specific to freeglut
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if bool(glut.glutSetOption):
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glut.glutSetOption( glut.GLUT_ACTION_ON_WINDOW_CLOSE,
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glut.GLUT_ACTION_GLUTMAINLOOP_RETURNS )
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glut.glutCreateWindow( sys.argv[0] )
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glut.glutReshapeWindow( 1, 1 )
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glut.glutHideWindow( )
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glut.glutWMCloseFunc( glut_close )
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glut.glutDisplayFunc( glut_display )
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glut.glutIdleFunc( glut_idle )
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else:
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glut.glutWMCloseFunc( glut_close )
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glut.glutDisplayFunc( glut_display )
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glut.glutIdleFunc( glut_idle)
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self.set_inputhook( inputhook_glut )
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self._current_gui = GUI_GLUT
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self._apps[GUI_GLUT] = True
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def disable_glut(self):
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"""Disable event loop integration with glut.
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This sets PyOS_InputHook to NULL and set the display function to a
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dummy one and set the timer to a dummy timer that will be triggered
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very far in the future.
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"""
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import OpenGL.GLUT as glut
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from glut_support import glutMainLoopEvent
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glut.glutHideWindow() # This is an event to be processed below
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glutMainLoopEvent()
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self.clear_inputhook()
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def enable_pyglet(self, app=None):
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"""Enable event loop integration with pyglet.
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Parameters
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----------
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app : ignored
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Ignored, it's only a placeholder to keep the call signature of all
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gui activation methods consistent, which simplifies the logic of
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supporting magics.
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Notes
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-----
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This methods sets the ``PyOS_InputHook`` for pyglet, which allows
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pyglet to integrate with terminal based applications like
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IPython.
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"""
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import pyglet
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from IPython.lib.inputhookpyglet import inputhook_pyglet
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self.set_inputhook(inputhook_pyglet)
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self._current_gui = GUI_PYGLET
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return app
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def disable_pyglet(self):
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"""Disable event loop integration with pyglet.
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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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enable_glut = inputhook_manager.enable_glut
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disable_glut = inputhook_manager.disable_glut
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enable_pyglet = inputhook_manager.enable_pyglet
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disable_pyglet = inputhook_manager.disable_pyglet
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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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# Convenience function to switch amongst them
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def enable_gui(gui=None, app=None):
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"""Switch amongst GUI input hooks by name.
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This is just a utility wrapper around the methods of the InputHookManager
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object.
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Parameters
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----------
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gui : optional, string or None
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If None (or 'none'), clears input hook, otherwise it must be one
|
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|
of the recognized GUI names (see ``GUI_*`` constants in module).
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|
|
|
|
app : optional, existing application object.
|
|
|
For toolkits that have the concept of a global app, you can supply an
|
|
|
existing one. If not given, the toolkit will be probed for one, and if
|
|
|
none is found, a new one will be created. Note that GTK does not have
|
|
|
this concept, and passing an app if `gui`=="GTK" will raise an error.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
The output of the underlying gui switch routine, typically the actual
|
|
|
PyOS_InputHook wrapper object or the GUI toolkit app created, if there was
|
|
|
one.
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|
"""
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|
guis = {None: clear_inputhook,
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|
|
GUI_NONE: clear_inputhook,
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|
|
GUI_OSX: lambda app=False: None,
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|
|
GUI_TK: enable_tk,
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|
|
GUI_GTK: enable_gtk,
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|
|
GUI_WX: enable_wx,
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|
|
GUI_QT: enable_qt4, # qt3 not supported
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|
|
GUI_QT4: enable_qt4,
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|
|
GUI_GLUT: enable_glut,
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|
|
GUI_PYGLET: enable_pyglet,
|
|
|
}
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|
|
try:
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|
|
gui_hook = guis[gui]
|
|
|
except KeyError:
|
|
|
e = "Invalid GUI request %r, valid ones are:%s" % (gui, guis.keys())
|
|
|
raise ValueError(e)
|
|
|
return gui_hook(app)
|
|
|
|
|
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|
