Open program in the center of the window at launch

controller/MainController.py

@@ -65,7 +65,7 @@ class MainController:
         => Event launched when a check for available updates is requested.
         """
         # TODO write the function
-        print("on_check_for_update")
+        self.show_information_dialog(self.get_config('app_name'), "Oupss, this functionality isn't available yet!\nTry it again later.")
 
     def on_about(self) -> None:
         """
@@ -102,11 +102,22 @@ class MainController:
             [function for controller]
         => Ask a question to the user and block until he answers with yes or no.
 
-        * :title: ->
-        * :message: ->
-        * :icon: -> 
+        * :title: -> Title of the dialogue.
+        * :message: -> Message of the dialogue.
+        * :icon: -> Icon of the dialogue
         """
         return self.__view.show_question_dialog(title, message, icon)
+
+    def show_information_dialog(self, title: str='title', message: str='informations!', icon: str='info') -> bool:
+        """
+            [function for controller]
+        => Display a pop-up information dialog to the user.
+
+        * :title: -> Title of the dialogue.
+        * :message: -> Message of the dialogue.
+        * :icon: -> Icon of the dialogue
+        """
+        return self.__view.show_information_dialog(title, message, icon)
     # END Controller methods
 
     # START Controller events