1 files changed, 11 insertions, 8 deletions
diff --git a/addons/gtkwidgettypefilter.py b/addons/gtkwidgettypefilter.py
index 4ffecb5..67b1e27 100644
--- a/addons/gtkwidgettypefilter.py
+++ b/addons/gtkwidgettypefilter.py
@@ -30,7 +30,7 @@ class GtkWidgetTypeFilter(EventFilter):
     text = TStringProperty("")
     strokes = TArrayProperty([])
 
-    def __init__(self, object_id, text=None, strokes=None):
+    def __init__(self, object_id=None, text=None, strokes=None):
         """Constructor
         @param next_state default EventFilter param, passed on to EventFilter
         @param object_id object tree-ish identifier
@@ -40,19 +40,22 @@ class GtkWidgetTypeFilter(EventFilter):
         At least one of text or strokes must be supplied
         """
         super(GtkWidgetTypeFilter, self).__init__()
-        self.object_id = object_id
-        self.text = text
-        self._captext = ""
-        self.strokes = strokes
-        self._capstrokes = []
-        self._widget = None
-        self._handler_id = None
+        if object_id:
+            self.object_id = object_id
+        if text:
+            self.text = text
+        if strokes:
+            self.strokes = strokes
 
     def install_handlers(self, callback, **kwargs):
         """install handlers
         @param callback default EventFilter callback arg
         """
         super(GtkWidgetTypeFilter, self).install_handlers(callback, **kwargs)
+        self._captext = ""
+        self._capstrokes = []
+        self._widget = None
+        self._handler_id = None
         logger.debug("~~~GtkWidgetTypeFilter install")
         activity = ObjectStore().activity
         if activity is None: