add gui methods and behaviour decorators

synergine2/simulation.py

         """
         raise NotImplementedError()
 
-    def action(self, data) -> [Event]:
+    def action(self, data) -> typing.List[Event]:
         """
         Method called in main process
         Return events will be give to terminals
     def action(self, data):
         step = self.get_step(data)
         return step.get_events()
+
+
+def disable_when(
+    predicate: typing.Callable[[Config, Simulation], bool],
+):
+    def decorator(func) -> typing.Any:
+        def wrapper(self, *args, **kwargs):
+            if predicate(self.config, self.simulation):
+                return False
+            return func(self, *args, **kwargs)
+        return wrapper
+    return decorator
+
+
+def config_value(parameter_to_resolve: str):
+    def predicate(
+        config: Config,
+        simulation: Simulation,
+    ):
+        return bool(config.resolve(parameter_to_resolve, False))
+    return predicate

synergine2_cocos2d/gui.py

 
 import pyglet
 import time
+
+from cocos.collision_model import AARectShape
 from pyglet.window import mouse
 
 import cocos
         self.wdrag_start_point = (0, 0)
         self.elastic_box = None  # type: MinMaxRect
         self.elastic_box_wminmax = 0, 0, 0, 0
-        self.selection = {}  # type: typing.List[Actor]
+        self.selection = {}  # type: typing.Dict[Actor, AARectShape]
         self.screen_mouse = (0, 0)
         self.world_mouse = (0, 0)
         self.sleft = None
             print("begin drag selection: drag_selecting, drag_moving",
                   self.drag_selecting, self.drag_moving)
 
-        else:
+        elif self.can_move(under_mouse_unique):
             # want drag move
             if under_mouse_unique in self.selection:
                 # want to move current selection
                 self.selection.clear()
                 self.selection_add(under_mouse_unique)
             self.begin_drag_move()
+    
+    def can_move(self, selected) -> bool:
+        return True
 
     def begin_drag_move(self):
         # begin drag move