added callback for updating event dropdown

wazp/callbacks/events.py

@@ -1,5 +1,3 @@
-from typing import Optional
-
 import dash
 from dash import Input, Output
 
@@ -23,17 +21,15 @@ def get_callbacks(app: dash.Dash) -> None:
     )
     def update_events_video_select(
         app_storage: dict,
-    ) -> tuple[list, Optional[str]]:
+    ) -> tuple[list, str]:
         """Update the video selection dropdown with the videos defined in
         the project configuration file.
 
         Parameters
         ----------
         app_storage : dict
-            dictionary with the following keys and values:
-            - 'config': a dict with the project configuration parameters
-            - 'metadata_fields': a dict with a set of attributes
-            - 'video_paths': a dict storing paths to the video files
+            data held in temporary memory storage,
+            accessible to all tabs in the app
 
         Returns
         -------
@@ -45,10 +41,49 @@ def update_events_video_select(
             Currently selected video name
         """
 
-        options = []
         if "video_paths" in app_storage:
             options = [
                 {"label": v, "value": v} for v in app_storage["video_paths"]
             ]
-        value = options[0]["value"] if options else None
-        return options, value
+            value = options[0]["value"]
+            return options, value
+        else:
+            return dash.no_update, dash.no_update
+
+    @app.callback(
+        [
+            Output("event-select", "options"),
+            Output("event-select", "value"),
+        ],
+        Input("session-storage", "data"),
+    )
+    def update_event_select_options(
+        app_storage: dict,
+    ) -> tuple[list, str]:
+        """Update the options of the event select dropdown with
+        the event tags defined in the project configuration file.
+
+        Parameters
+        ----------
+        app_storage : dict
+            data held in temporary memory storage,
+            accessible to all tabs in the app
+
+        Returns
+        -------
+        options : list
+            list of dictionaries with the following keys and values:
+            - 'label': event tag
+            - 'value': event tag
+        value : str
+            Currently selected event tag
+        """
+        if "config" in app_storage.keys():
+            # Get ROI names from stored config
+            config = app_storage["config"]
+            event_tags = config["event_tags"]
+            options = [{"label": t, "value": t} for t in event_tags]
+            value = event_tags[0]
+            return options, value
+        else:
+            return dash.no_update, dash.no_update