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"""GUI support for the IPython ZeroMQ kernel - GTK toolkit support.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010 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.txt, 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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# stdlib
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import sys
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# Third-party
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import gobject
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import gtk
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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class GTKEmbed(object):
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"""A class to embed a kernel into the GTK main event loop.
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"""
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def __init__(self, kernel):
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self.kernel = kernel
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# These two will later store the real gtk functions when we hijack them
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self.gtk_main = None
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self.gtk_main_quit = None
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def start(self):
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"""Starts the GTK main event loop and sets our kernel startup routine.
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"""
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# Register our function to initiate the kernel and start gtk
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gobject.idle_add(self._wire_kernel)
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gtk.main()
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def _wire_kernel(self):
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"""Initializes the kernel inside GTK.
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This is meant to run only once at startup, so it does its job and
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returns False to ensure it doesn't get run again by GTK.
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"""
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self.gtk_main, self.gtk_main_quit = self._hijack_gtk()
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gobject.timeout_add(int(1000*self.kernel._poll_interval),
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self.iterate_kernel)
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return False
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def iterate_kernel(self):
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"""Run one iteration of the kernel and return True.
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GTK timer functions must return True to be called again, so we make the
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call to :meth:`do_one_iteration` and then return True for GTK.
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"""
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self.kernel.do_one_iteration()
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return True
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def stop(self):
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# FIXME: this one isn't getting called because we have no reliable
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# kernel shutdown. We need to fix that: once the kernel has a
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# shutdown mechanism, it can call this.
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self.gtk_main_quit()
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sys.exit()
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def _hijack_gtk(self):
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"""Hijack a few key functions in GTK for IPython integration.
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Modifies pyGTK's main and main_quit with a dummy so user code does not
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block IPython. This allows us to use %run to run arbitrary pygtk
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scripts from a long-lived IPython session, and when they attempt to
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start or stop
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Returns
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-------
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The original functions that have been hijacked:
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- gtk.main
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- gtk.main_quit
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"""
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def dummy(*args, **kw):
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pass
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# save and trap main and main_quit from gtk
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orig_main, gtk.main = gtk.main, dummy
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orig_main_quit, gtk.main_quit = gtk.main_quit, dummy
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return orig_main, orig_main_quit
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