refactor: use dict to store widgets

multi_user/__init__.py

@@ -19,7 +19,7 @@
 bl_info = {
     "name": "Multi-User",
     "author": "Swann Martinez",
-    "version": (0, 1, 0),
+    "version": (0, 1, 1),
     "description": "Enable real-time collaborative workflow inside blender",
     "blender": (2, 82, 0),
     "location": "3D View > Sidebar > Multi-User tab",

multi_user/delayable.py

@@ -307,6 +307,9 @@ class SessionUserSync(Timer):
             for index, user in enumerate(ui_users):
                 if user.username not in session_users.keys():
                     ui_users.remove(index)
+                    renderer.remove_widget(f"{user}_cam")
+                    renderer.remove_widget(f"{user}_select")
+                    renderer.remove_widget(f"{user}_name")
                     break
 
             for user in session_users:
@@ -315,9 +318,9 @@ class SessionUserSync(Timer):
                     new_key.name = user
                     new_key.username = user
                     if user != self.settings.username:
-                        renderer.add_widget(UserFrustumWidget(user))
+                        renderer.add_widget(f"{user}_cam", UserFrustumWidget(user))
-                        renderer.add_widget(UserSelectionWidget(user))
+                        renderer.add_widget(f"{user}_select", UserSelectionWidget(user))
-                        renderer.add_widget(UserNameWidget(user))
+                        renderer.add_widget(f"{user}_name", UserNameWidget(user))
 
 
 class MainThreadExecutor(Timer):

multi_user/operators.py

@@ -107,9 +107,6 @@ def on_connection_end():
         bpy.app.handlers.depsgraph_update_post.remove(
             depsgraph_evaluation)
 
-    renderer.clear_widgets()
-    refresh_3d_view()
-
     # Step 3: remove file handled
     logger = logging.getLogger()
     for handler in logger.handlers:
@@ -268,8 +265,6 @@ class SessionStartOperator(bpy.types.Operator):
 
         bpy.ops.session.apply_armature_operator()
 
-        renderer.add_widget(SessionStatusWidget())
-
         self.report(
             {'INFO'},
             f"connecting to tcp://{settings.ip}:{settings.port}")
@@ -742,6 +737,7 @@ def depsgraph_evaluation(scene):
 
 def register():
     from bpy.utils import register_class
+
     for cls in classes:
         register_class(cls)
 

multi_user/presence.py

@@ -191,12 +191,20 @@ def get_view_matrix() -> list:
 
 
 class Widget(object):
-    draw_type = 'POST_VIEW'
+    """ Base class to define an interface element
+    """
+    draw_type: str = 'POST_VIEW'  # Draw event type
 
     def poll(self) -> bool:
+        """Test if the widget can be drawn or not 
+
+        :return: bool
+        """
         return True
 
     def draw(self):
+        """How to draw the widget
+        """
         raise NotImplementedError()
 
 
@@ -376,11 +384,12 @@ class UserNameWidget(Widget):
 class SessionStatusWidget(Widget):
     draw_type = 'POST_PIXEL'
 
-    def __init__(self):
+    @property
-        self.settings = bpy.context.window_manager.session
+    def settings(self):
+        return getattr(bpy.context.window_manager, 'session', None)
 
     def poll(self):
-        return self.settings.presence_show_session_status and \
+        return self.settings and self.settings.presence_show_session_status and \
             self.settings.enable_presence
 
     def draw(self):
@@ -403,13 +412,16 @@ class DrawFactory(object):
     def __init__(self):
         self.post_view_handle = None
         self.post_pixel_handle = None
-        self.widgets = []
+        self.widgets = {}
 
-    def add_widget(self, widget: Widget):
+    def add_widget(self, name:str, widget: Widget):
-        self.widgets.append(widget)
+        self.widgets[name] = widget
 
-    def remove_widget(self, widget):
+    def remove_widget(self,  name: str):
-        self.widgets.remove(widget)
+        if name in self.widgets:
+            del self.widgets[name]
+        else:
+            logging.info("Widget {name} not existing")
 
     def clear_widgets(self):
         self.widgets.clear()
@@ -441,7 +453,7 @@ class DrawFactory(object):
 
     def post_view_callback(self):
         try:
-            for widget in self.widgets:
+            for widget in self.widgets.values():
                 if widget.draw_type == 'POST_VIEW' and widget.poll():
                     widget.draw()
         except Exception as e:
@@ -450,7 +462,7 @@ class DrawFactory(object):
 
     def post_pixel_callback(self):
         try:
-            for widget in self.widgets:
+            for widget in self.widgets.values():
                 if widget.draw_type == 'POST_PIXEL' and widget.poll():
                     widget.draw()
         except Exception as e:
@@ -465,6 +477,10 @@ this.renderer = DrawFactory()
 def register():
     this.renderer.register_handlers()
 
+    renderer.add_widget("session_status", SessionStatusWidget())
+
 
 def unregister():
     this.renderer.unregister_handlers()
+    
+    this.renderer.clear_widgets()