Gtk3 integration with ipython works.

IPython/lib/__init__.py

@@ -21,6 +21,7 b' from IPython.lib.inputhook import ('
     enable_tk, disable_tk,
     enable_glut, disable_glut,
     enable_pyglet, disable_pyglet,
+    enable_gtk3, disable_gtk3,
     set_inputhook, clear_inputhook,
     current_gui
 )

IPython/lib/inputhook.py

@@ -36,6 +36,7 b" GUI_TK = 'tk'"
 GUI_OSX = 'osx'
 GUI_GLUT = 'glut'
 GUI_PYGLET = 'pyglet'
+GUI_GTK3 = 'gtk3'
 GUI_NONE = 'none' # i.e. disable
 
 #-----------------------------------------------------------------------------
@@ -421,6 +422,33 b' class InputHookManager(object):'
         """
         self.clear_inputhook()
 
+    def enable_gtk3(self, app=None):
+        """Enable event loop integration with Gtk3 (gir bindings).
+
+        Parameters
+        ----------
+        app : ignored
+           Ignored, it's only a placeholder to keep the call signature of all
+           gui activation methods consistent, which simplifies the logic of
+           supporting magics.
+
+        Notes
+        -----
+        This methods sets the PyOS_InputHook for Gtk3, which allows
+        the Gtk3 to integrate with terminal based applications like
+        IPython.
+        """
+        from IPython.lib.inputhookgtk3 import inputhook_gtk3
+        self.set_inputhook(inputhook_gtk3)
+        self._current_gui = GUI_GTK
+
+    def disable_gtk3(self):
+        """Disable event loop integration with PyGTK.
+
+        This merely sets PyOS_InputHook to NULL.
+        """
+        self.clear_inputhook()
+
     def current_gui(self):
         """Return a string indicating the currently active GUI or None."""
         return self._current_gui
@@ -439,6 +467,8 b' enable_glut = inputhook_manager.enable_glut'
 disable_glut = inputhook_manager.disable_glut
 enable_pyglet = inputhook_manager.enable_pyglet
 disable_pyglet = inputhook_manager.disable_pyglet
+enable_gtk3 = inputhook_manager.enable_gtk3
+disable_gtk3 = inputhook_manager.disable_gtk3
 clear_inputhook = inputhook_manager.clear_inputhook
 set_inputhook = inputhook_manager.set_inputhook
 current_gui = inputhook_manager.current_gui
@@ -480,6 +510,7 b' def enable_gui(gui=None, app=None):'
             GUI_QT4: enable_qt4,
             GUI_GLUT: enable_glut,
             GUI_PYGLET: enable_pyglet,
+	    GUI_GTK3: enable_gtk3,
             }
     try:
         gui_hook = guis[gui]