[ENH] Select Columns: Enable filtering of used features

Orange/widgets/data/owselectcolumns.py

@@ -169,13 +169,12 @@ def dropcompleted(action):
 
         box = gui.vBox(self.controlArea, "Features", addToLayout=False)
         self.used_attrs = VariablesListItemModel()
+        filter_edit, self.used_attrs_view = variables_filter(
+            parent=self, model=self.used_attrs,
+            accepted_type=(Orange.data.DiscreteVariable,
+                           Orange.data.ContinuousVariable))
         self.used_attrs.rowsInserted.connect(self.__used_attrs_changed)
         self.used_attrs.rowsRemoved.connect(self.__used_attrs_changed)
-        self.used_attrs_view = VariablesListItemView(
-            acceptedType=(Orange.data.DiscreteVariable,
-                          Orange.data.ContinuousVariable))
-
-        self.used_attrs_view.setModel(self.used_attrs)
         self.used_attrs_view.selectionModel().selectionChanged.connect(
             partial(update_on_change, self.used_attrs_view))
         self.used_attrs_view.dragDropActionDidComplete.connect(dropcompleted)
@@ -187,6 +186,7 @@ def dropcompleted(action):
         )
         self.enable_use_features_box()
         box.layout().addWidget(self.use_features_box)
+        box.layout().addWidget(filter_edit)
         box.layout().addWidget(self.used_attrs_view)
         layout.addWidget(box, 0, 2, 1, 1)
 

Orange/widgets/data/tests/test_owselectcolumns.py

@@ -1,7 +1,8 @@
 from unittest import TestCase
 from unittest.mock import Mock
 
-from AnyQt.QtCore import Qt
+from AnyQt.QtCore import QMimeData, QPoint, Qt
+from AnyQt.QtGui import QDragEnterEvent
 
 from Orange.data import Table, ContinuousVariable, DiscreteVariable, Domain
 from Orange.widgets.data.contexthandlers import \
@@ -346,3 +347,19 @@ def test_use_features_checked(self):
         self.assertFalse(widget.use_features_box.checkbox.isChecked())
         self.assertListEqual(out_features, AttributeList(attrs))
         self.assertControlsEnabled(True, True, True, widget)
+
+    def test_used_attrs_supported_types(self):
+        data = Table("zoo")
+        event = self._drag_enter_event(data.domain[:1])
+        self.widget.used_attrs_view.dragEnterEvent(event)
+        self.assertTrue(event.isAccepted())
+
+        event = self._drag_enter_event(data.domain.metas)
+        self.widget.used_attrs_view.dragEnterEvent(event)
+        self.assertFalse(event.isAccepted())
+
+    def _drag_enter_event(self, variables):
+        self.event_data = mime = QMimeData()
+        mime.setProperty("_items", variables)
+        return QDragEnterEvent(QPoint(0, 0), Qt.MoveAction, mime,
+                               Qt.NoButton, Qt.NoModifier)

Orange/widgets/utils/listfilter.py

@@ -169,7 +169,7 @@ def eventFilter(self, obj, event):
             return False
 
 
-def variables_filter(model, parent=None):
+def variables_filter(model, parent=None, accepted_type=Orange.data.Variable):
     """
     GUI components: ListView with a lineedit which works as a filter. One can write
     a variable name in a edit box and possible matches are then shown in a listview.
@@ -221,7 +221,7 @@ def update_completer_prefix():
 
     proxy = VariableFilterProxyModel()
     proxy.setSourceModel(model)
-    view = VariablesListItemView(acceptedType=Orange.data.Variable)
+    view = VariablesListItemView(acceptedType=accepted_type)
     view.setModel(proxy)
 
     model.dataChanged.connect(update_completer_model)