refactor(image-list): reuse AbstractElement state+ctrl

Guard against double call to init_visibile_columns

src/nrtk_explorer/app/transforms.py

@@ -391,7 +391,7 @@ def apply_ui(self):
             self._parameters_app.transform_apply_ui()
 
     def dataset_widget(self):
-        ImageList(self.server, self.on_scroll, self.on_hover)
+        ImageList(self.on_scroll, self.on_hover)
 
     # This is only used within when this module (file) is executed as an Standalone app.
     @property

src/nrtk_explorer/app/ui/image_list.py

@@ -68,11 +68,17 @@ def column_toggler(old_columns, new_columns):
     "original_detection_to_transformed_detection_score",
 ]
 
+visibile_columns_initialized = False
+
 
 def init_visibile_columns(state):
+    global visibile_columns_initialized
+    if visibile_columns_initialized:
+        return
     state.visible_columns = [col["name"] for col in COLUMNS]
     make_dependent_columns_handler(state, ORIGINAL_COLUMNS)
     make_dependent_columns_handler(state, TRANSFORM_COLUMNS)
+    visibile_columns_initialized = True
 
 
 class ImageWithSpinner(html.Div):
@@ -147,12 +153,8 @@ def update_pagination(self, **kwargs):
         else:
             self.state.pagination = {**old_pagination, "rowsPerPage": 0}  # show all rows
 
-    def __init__(self, server, on_scroll, on_hover, **kwargs):
+    def __init__(self, on_scroll, on_hover, **kwargs):
         super().__init__(classes="full-height", **kwargs)
-        self.server = server
-        self.state = server.state
-        self.ctrl = server.controller
-
         self.visible_ids = set()
         self.scroll_callback = on_scroll
         self.update_pagination()