Index: packages/charted/lib/charts/data_transformers/filter_transformer.dart |
diff --git a/packages/charted/lib/charts/data_transformers/filter_transformer.dart b/packages/charted/lib/charts/data_transformers/filter_transformer.dart |
index cc002eae1b1285454b6c6a3eb6c817673e677967..55b5b335f299b43733f19d00a4825d57567b3d1f 100644 |
--- a/packages/charted/lib/charts/data_transformers/filter_transformer.dart |
+++ b/packages/charted/lib/charts/data_transformers/filter_transformer.dart |
@@ -14,7 +14,7 @@ typedef bool FilterFunction(dynamic value); |
/// of data will be tested by passing the value at target column to the filter |
/// function. If filter function returns false, the row will be filtered out. |
/// This transformer does not modify the column part of the input ChartData. |
-class FilterTransformer extends ChangeNotifier |
+class FilterTransformer extends Observable |
implements ChartDataTransform, ChartData { |
final SubscriptionsDisposer _dataSubscriptions = new SubscriptionsDisposer(); |
List<ChartColumnSpec> columns; |