rework of update mechanism and noaction message support for faster clicks on modal

src/update.py

@@ -2,49 +2,40 @@ import lib.screenful as screenful
 
 class Update:
     def __init__(self):
-        self.message_queue = []
         self.model = None
         self.view = None
 
-    def update_model(self):
+    def update_model(self, msg):
+        # check if completely no action needed
+        if msg.no_action():
+            return
+        
+        # by default, no need to redraw entry
         entry_redraw = False
-        reset = False
+        
+        # check if we need to signal the data change
+        if msg.data_change():
+            screenful.changed()
+            entry_redraw = True
+            
+        # redraw of view can happen even if no data changed
+        entry_redraw |= msg.entry_redraw()
         
         # check if we need to reset the model
-        for msg in self.message_queue:
-            if msg.reset():
-                reset = True
-                break
+        reset = msg.reset()
         
         if reset:
             self.model.pre_reset()
             
-        # check if we need to signal the data change
-        # and for entry redraw
-        for msg in self.message_queue:
-            if msg.data_change():
-                screenful.changed()
-                entry_redraw = True
-                break
-            
-            if msg.entry_redraw():
-                entry_redraw = True
-            
-        # do update
-        for msg in self.message_queue:
-            msg.update_model(self.model)
-            msg.clear_args()
+        # actually run the update_model
+        msg.update_model(self.model)
+        msg.clear_args()
             
+        # post reset comes now
         if reset:
             self.model.post_reset()
 
         self.view.view(self.model, entry_redraw)
-        self.message_queue = []
-
-    def schedule(self, msg):
-        self.message_queue.append(msg)
-        # for now, directly clearing message queue
-        self.update_model()
     
     def set_model(self, model):
         self.model = model