From 17d0d1318ac26cf0a2b5b554af718688047d7f5b 2014-07-26 15:47:16
From: John Stowers <john.stowers@gmail.com>
Date: 2014-07-26 15:47:16
Subject: [PATCH] add gtk3 support to ipython kernel

---

diff --git a/IPython/kernel/zmq/eventloops.py b/IPython/kernel/zmq/eventloops.py
index 3e195a3..9609ca3 100644
--- a/IPython/kernel/zmq/eventloops.py
+++ b/IPython/kernel/zmq/eventloops.py
@@ -154,6 +154,14 @@ def loop_gtk(kernel):
     gtk_kernel.start()
 
 
+def loop_gtk3(kernel):
+    """Start the kernel, coordinating with the GTK event loop"""
+    from .gui.gtk3embed import GTKEmbed
+
+    gtk_kernel = GTKEmbed(kernel)
+    gtk_kernel.start()
+
+
 def loop_cocoa(kernel):
     """Start the kernel, coordinating with the Cocoa CFRunLoop event loop
     via the matplotlib MacOSX backend.
@@ -233,6 +241,7 @@ loop_map = {
     'wx' : loop_wx,
     'tk' : loop_tk,
     'gtk': loop_gtk,
+    'gtk3': loop_gtk3,
     None : None,
 }
 
diff --git a/IPython/kernel/zmq/gui/gtk3embed.py b/IPython/kernel/zmq/gui/gtk3embed.py
new file mode 100644
index 0000000..8488550
--- /dev/null
+++ b/IPython/kernel/zmq/gui/gtk3embed.py
@@ -0,0 +1,85 @@
+"""GUI support for the IPython ZeroMQ kernel - GTK toolkit support.
+"""
+#-----------------------------------------------------------------------------
+#  Copyright (C) 2010-2011  The IPython Development Team
+#
+#  Distributed under the terms of the BSD License.  The full license is in
+#  the file COPYING.txt, distributed as part of this software.
+#-----------------------------------------------------------------------------
+
+#-----------------------------------------------------------------------------
+# Imports
+#-----------------------------------------------------------------------------
+# stdlib
+import sys
+
+# Third-party
+from gi.repository import GObject, Gtk
+
+#-----------------------------------------------------------------------------
+# Classes and functions
+#-----------------------------------------------------------------------------
+
+class GTKEmbed(object):
+    """A class to embed a kernel into the GTK main event loop.
+    """
+    def __init__(self, kernel):
+        self.kernel = kernel
+        # These two will later store the real gtk functions when we hijack them
+        self.gtk_main = None
+        self.gtk_main_quit = None
+
+    def start(self):
+        """Starts the GTK main event loop and sets our kernel startup routine.
+        """
+        # Register our function to initiate the kernel and start gtk
+        GObject.idle_add(self._wire_kernel)
+        Gtk.main()
+
+    def _wire_kernel(self):
+        """Initializes the kernel inside GTK.
+        
+        This is meant to run only once at startup, so it does its job and
+        returns False to ensure it doesn't get run again by GTK.
+        """
+        self.gtk_main, self.gtk_main_quit = self._hijack_gtk()
+        GObject.timeout_add(int(1000*self.kernel._poll_interval),
+                            self.iterate_kernel)
+        return False
+        
+    def iterate_kernel(self):
+        """Run one iteration of the kernel and return True.
+
+        GTK timer functions must return True to be called again, so we make the
+        call to :meth:`do_one_iteration` and then return True for GTK.
+        """
+        self.kernel.do_one_iteration()
+        return True
+
+    def stop(self):
+        # FIXME: this one isn't getting called because we have no reliable
+        # kernel shutdown.  We need to fix that: once the kernel has a
+        # shutdown mechanism, it can call this.
+        self.gtk_main_quit()
+        sys.exit()
+
+    def _hijack_gtk(self):
+        """Hijack a few key functions in GTK for IPython integration.
+
+        Modifies pyGTK's main and main_quit with a dummy so user code does not
+        block IPython.  This allows us to use %run to run arbitrary pygtk
+        scripts from a long-lived IPython session, and when they attempt to
+        start or stop
+
+        Returns
+        -------
+        The original functions that have been hijacked:
+        - Gtk.main
+        - Gtk.main_quit
+        """
+        def dummy(*args, **kw):
+            pass
+        # save and trap main and main_quit from gtk
+        orig_main, Gtk.main = Gtk.main, dummy
+        orig_main_quit, Gtk.main_quit = Gtk.main_quit, dummy
+        return orig_main, orig_main_quit