Merge pull request #2385 from astrofrog/fix-reference-data-update

glue/viewers/common/viewer.py

@@ -276,6 +276,12 @@ def remove_subset(self, subset):
     def _add_subset(self, message):
         self.add_subset(message.subset)
 
+    def _update_data_numerical(self, message):
+        # For some viewers, we might want to do additional things when the
+        # actual numerical values or shape of a dataset change, but by default
+        # we just pass this on to _update_data
+        self._update_data(message)
+
     def _update_data(self, message):
         if message.data in self._layer_artist_container:
             for layer_artist in self._layer_artist_container:
@@ -329,7 +335,7 @@ def register_to_hub(self, hub):
                       filter=self._has_data_or_subset)
 
         hub.subscribe(self, msg.NumericalDataChangedMessage,
-                      handler=self._update_data,
+                      handler=self._update_data_numerical,
                       filter=self._has_data_or_subset)
 
         hub.subscribe(self, msg.DataCollectionDeleteMessage,

glue/viewers/image/viewer.py

@@ -86,8 +86,8 @@ def add_data(self, data):
             self._set_wcs()
         return result
 
-    def _update_data(self, *args, **kwargs):
-        super()._update_data(*args, **kwargs)
+    def _update_data_numerical(self, *args, **kwargs):
+        super()._update_data_numerical(*args, **kwargs)
         self.state._reference_data_changed(force=True)
 
     def _on_slice_change(self, event=None):