quick_frontend: add a method getWidget to return a widget without creating it if it doesn't exist

frontends/src/quick_frontend/quick_widgets.py

@@ -93,6 +93,21 @@ class QuickWidgetsManager(object):
         else:
             return widgets_map.itervalues()
 
+    def getWidget(self, class_, target, profile):
+        """Get a widget without creating it if it doesn't exist.
+
+        @param class_(class): class of the widget to create
+        @param target: target depending of the widget, usually a JID instance
+        @param profile (unicode): %(doc_profile)s
+        @return: a class_ instance or None if the widget doesn't exist
+        """
+        class_ = self.getRealClass(class_)
+        hash_ = class_.getWidgetHash(target, profile)
+        try:
+            return self._widgets[class_.__name__][hash_]
+        except KeyError:
+            return None
+
     def getOrCreateWidget(self, class_, target, *args, **kwargs):
         """Get an existing widget or create a new one when necessary