backend, frontends: XMLUI refactoring:

- session_id is resent in result data if found in incoming data
    - list now use distinct labels and values (label is the one displayed, value is the one used for everything else)
    - misc refactoring

/!\ urwid SàtExt must be updated ! /!\

src/tools/xml_tools.py

@@ -219,7 +219,7 @@ class Field(object):
 class XMLUI(object):
     """This class is used to create a user interface (form/window/parameters/etc) using SàT XML"""
 
-    def __init__(self, panel_type, layout="vertical", title=None, submit_id=None):
+    def __init__(self, panel_type, layout="vertical", title=None, submit_id=None, session_id=None):
         """Init SàT XML Panel
         @param panel_type: one of
             - window (new window)
@@ -234,9 +234,10 @@ class XMLUI(object):
         @param title: title or default if None
         @param submit_id: callback id to call for panel_type we can submit (form, param)
         """
-        if not panel_type in ['window', 'form', 'param']:
-            error(_("Unknown panel type [%s]") % panel_type)
-            assert(False)
+        if panel_type not in ['window', 'form', 'param']:
+            raise exceptions.DataError(_("Unknown panel type [%s]") % panel_type)
+        if panel_type == 'form' and submit_id is None:
+            raise exceptions.DataError(_("form XMLUI need a submit_id"))
         self.type_ = panel_type
         impl = minidom.getDOMImplementation()
 
@@ -247,6 +248,8 @@ class XMLUI(object):
             top_element.setAttribute("title", title)
         if submit_id:
             top_element.setAttribute("submit", submit_id)
+        if session_id is not None:
+            top_element.setAttribute("session_id", session_id)
         self.parentTabsLayout = None  # used only we have 'tabs' layout
         self.currentCategory = None  # used only we have 'tabs' layout
         self.currentLayout = None
@@ -255,6 +258,12 @@ class XMLUI(object):
     def __del__(self):
         self.doc.unlink()
 
+    def setSessionId(self, session_id):
+        assert(session_id)
+        top_element = self.doc.documentElement
+        top_element.setAttribute("session_id", session_id)
+
+
     def _createLayout(self, layout, parent=None):
         """Create a layout element
         @param type: layout type (cf init doc)
@@ -415,7 +424,12 @@ class XMLUI(object):
         @param parent: multi-values element"""
         for option in options:
             opt = self.doc.createElement('option')
-            opt.setAttribute('value', option)
+            if isinstance(option, basestring):
+                value, label = option, option
+            elif isinstance(option, tuple):
+                value, label = option
+            opt.setAttribute('value', value)
+            opt.setAttribute('label', label)
             parent.appendChild(opt)
 
     # Advanced list