add custom event listener

From model to controller.

Author: annie-xd-wang

src/navigate/controller/controller.py

@@ -195,6 +195,7 @@ def __init__(
         self.view = view(root)
 
         # Sub Gui Controllers
+        self.event_listeners = {}
         #: AcquireBarController: Acquire Bar Sub-Controller.
         self.acquire_bar_controller = AcquireBarController(self.view.acqbar, self)
 
@@ -1295,9 +1296,22 @@ def update_event(self):
             elif event == "display_camera_parameters":
                 self.camera_setting_controller.update_camera_parameters_silent(*value)
 
+            elif event in self.event_listeners.keys():
+                try:
+                    self.event_listeners[event](value)
+                except Exception:
+                    print(f"*** unhandled event: {event}, {value}")
+
     def add_acquisition_mode(self, name, acquisition_obj):
         if name in self.plugin_acquisition_modes:
             print(f"*** plugin acquisition mode {name} exists, can't add another one!")
             return
         self.plugin_acquisition_modes[name] = acquisition_obj(name)
         self.acquire_bar_controller.add_mode(name)
+
+    def register_event_listener(self, event_name, event_handler):
+        self.event_listeners[event_name] = event_handler
+
+    def register_event_listeners(self, events):
+        for event_name, event_handler in events.items():
+            self.register_event_listener(event_name, event_handler)

src/navigate/controller/sub_controllers/plugins.py

@@ -217,12 +217,13 @@ def build_tab_window(self, plugin_name, frame, controller):
         frame: object
             navigate frame object
         controller: object
-            navigate controller
+            Controller Class
         """
         try:
             plugin_frame = frame(self.view.settings)
             self.view.settings.add(plugin_frame, text=plugin_name, sticky=tk.NSEW)
             plugin_controller = controller(plugin_frame, self.parent_controller)
+            self.parent_controller.register_event_listeners(getattr(plugin_controller, "custom_events", {}))
             controller_name = (
                 "__plugin" + "_".join(plugin_name.lower().split()) + "_controller"
             )
@@ -272,6 +273,7 @@ def func(*args, **kwargs):
             plugin_frame.grid(row=0, column=0, sticky=tk.NSEW, padx=10, pady=10)
 
             plugin_controller = controller(plugin_frame, self.parent_controller)
+            self.parent_controller.register_event_listeners(getattr(plugin_controller, "custom_events", {}))
 
             plugin_controller.popup = popup
             popup.deiconify()