quick frontend(app): added listener for selected widget

sat_frontends/quick_frontend/constants.py

@@ -98,6 +98,7 @@ class Const(constants.Const):
         "avatar",
         "nick",
         "presence",
+        "selected",
         "profilePlugged",
         "contactsFilled",
         "disconnect",

sat_frontends/quick_frontend/quick_app.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-
 # helper class for making a SAT frontend
 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
 
@@ -450,6 +449,8 @@ class QuickApp(object):
 
         Must be set by frontend
         """
+        if self._selected_widget == wid:
+            return
         self._selected_widget = wid
         try:
             onSelected = wid.onSelected
@@ -458,6 +459,8 @@ class QuickApp(object):
         else:
             onSelected()
 
+        self.callListeners("selected", wid)
+
     # backend state management
 
     @property
@@ -554,6 +557,8 @@ class QuickApp(object):
                 args: (entity, new_nick, profile)
             - presence: called when a presence is received
                 args: (entity, show, priority, statuses, profile)
+            - selected: called when a widget is selected
+                args: (selected_widget,)
             - notification: called when a new notification is emited
                 args: (entity, notification_data, profile)
             - notification_clear: called when notifications are cleared