make signal registration more robust, and add a function to walk up the widget tree to find the top-level Window object

terminatorlib/container.py

@@ -6,7 +6,7 @@
 import gobject
 
 from config import Config
-from util import dbg
+from util import dbg, err
 
 # pylint: disable-msg=R0921
 class Container(object):
@@ -39,16 +39,29 @@ class Container(object):
                         signal['name'], widget))
             else:
                 dbg('Container:: registering signal for %s on %s' % (signal['name'], widget))
+                try:
                     gobject.signal_new(signal['name'],
                                        widget,
                                        signal['flags'],
                                        signal['return_type'],
                                         signal['param_types'])
+                except RuntimeError:
+                    err('Container:: registering signal for %s on %s failed' %
+                            (signal['name'], widget))
 
     def get_offspring(self):
         """Return a list of child widgets, if any"""
         return(self.children)
 
+    def get_top_window(self, startpoint):
+        """Return the Window instance this container belongs to"""
+        widget = startpoint
+        parent = widget.get_parent()
+        while parent:
+            widget = parent
+            parent = widget.get_parent()
+        return(widget)
+
     def split_horiz(self, widget):
         """Split this container horizontally"""
         return(self.split_axis(widget, True))