CtrlClickMessage class, will use later.

src/message/simple_messages.py

@@ -48,4 +48,24 @@ class ModalNotOkClose(Reset):
     def data_change(self):
         return False
         
+        
+# Special message to handle ctrl+click and click
+# overwrite update_model_noctrl and/or update_model_ctrl
+class CtrlClickMessage(ClickMessage):
+    def on_event(self, event):
+        super().on_event(event)
+        self.ctrl = event.ctrlKey
+    
+    def update_model(self, model):
+        if self.ctrl:
+            self.update_model_ctrl(model)
+        else:
+            self.update_model_noctrl(model)
+
+    def update_model_ctrl(self, model):
+        pass
+   
+    def update_model_noctrl(self, model):
+        pass
+