tools (common/data_objects): new OnClick class

OnClick is used to specify what do to when clicking on element.
For now it only handles target URL.

src/tools/common/data_objects.py

@@ -195,3 +195,17 @@ class Identities(object):
 
     def __contains__(self, jid_str):
         return jid_str in self.identities
+
+
+class OnClick(object):
+    """Class to handle clickable elements targets"""
+
+    def __init__(self, url=None):
+        self.url = url
+
+    def formatUrl(self, item):
+        """Use an item to format URL
+
+        item will be formatted using "item=item" in format()
+        """
+        return self.url.format(item=item)