util: Break out common function to conditionally set gtk property

src/virtManager/error.py

@@ -22,14 +22,14 @@ import gtk.glade
 
 import logging
 
+import virtManager.util as util
+
 def safe_set_text(self, text):
-    try:
+    # pygtk < 2.10 doesn't support test property
-        # pygtk < 2.10 doesn't support test property
+    if not util.safe_set_prop(self, "text", text):
-        self.get_property("text")
-        self.set_property("text", text)
-    except TypeError:
         self.set_markup(text)
 
+
 class vmmErrorDialog (gtk.MessageDialog):
     def __init__ (self, parent=None, flags=0, typ=gtk.MESSAGE_INFO,
                   buttons=gtk.BUTTONS_NONE, message_format=None,

src/virtManager/util.py

@@ -261,3 +261,17 @@ def bind_escape_key_close(vmmobj):
             vmmobj.close()
 
     vmmobj.topwin.connect("key-press-event", close_on_escape)
+
+def safe_set_prop(self, prop, value):
+    """
+    Make sure a gtk property is supported, and set to value
+
+    Return True if property was sucessfully set, False otherwise
+    """
+
+    try:
+       self.get_property(prop)
+       self.set_property(prop, value)
+       return True
+    except TypeError:
+        return False