[ENH] OWSelectColumns: Data info displayed in the status bar

Orange/widgets/data/owselectcolumns.py

@@ -14,6 +14,7 @@
 from Orange.widgets.settings import ContextSetting, Setting
 from Orange.widgets.utils.listfilter import VariablesListItemView, slices, variables_filter
 from Orange.widgets.utils.widgetpreview import WidgetPreview
+from Orange.widgets.utils.state_summary import format_summary_details
 from Orange.widgets.widget import Input, Output, AttributeList, Msg
 from Orange.data.table import Table
 from Orange.widgets.utils import vartype
@@ -266,6 +267,9 @@ def dropcompleted(action):
         self.output_data = None
         self.original_completer_items = []
 
+        self.info.set_input_summary(self.info.NoInput)
+        self.info.set_output_summary(self.info.NoOutput)
+
         self.resize(600, 600)
 
     @property
@@ -343,11 +347,13 @@ def set_data(self, data=None):
             self.class_attrs[:] = classes
             self.meta_attrs[:] = metas
             self.available_attrs[:] = available
+            self.info.set_input_summary(len(data), format_summary_details(data))
         else:
             self.used_attrs[:] = []
             self.class_attrs[:] = []
             self.meta_attrs[:] = []
             self.available_attrs[:] = []
+            self.info.set_input_summary(self.info.NoInput)
 
     def update_domain_role_hints(self):
         """ Update the domain hints to be stored in the widgets settings.
@@ -522,10 +528,13 @@ def commit(self):
             self.output_data = newdata
             self.Outputs.data.send(newdata)
             self.Outputs.features.send(AttributeList(attributes))
+            self.info.set_output_summary(len(newdata),
+                                         format_summary_details(newdata))
         else:
             self.output_data = None
             self.Outputs.data.send(None)
             self.Outputs.features.send(None)
+            self.info.set_output_summary(self.info.NoOutput)
 
     def reset(self):
         self.enable_used_attrs()

Orange/widgets/data/tests/test_owselectcolumns.py

@@ -1,3 +1,4 @@
+# pylint: disable=unsubscriptable-object
 from unittest import TestCase
 from unittest.mock import Mock
 
@@ -9,6 +10,7 @@
     SelectAttributesDomainContextHandler
 from Orange.widgets.settings import ContextSetting
 from Orange.widgets.utils import vartype
+from Orange.widgets.utils.state_summary import format_summary_details
 from Orange.widgets.tests.base import WidgetTest
 from Orange.widgets.data.owselectcolumns \
     import OWSelectAttributes, VariablesListItemModel
@@ -386,3 +388,23 @@ def test_move_rows(self):
             d1.domain.attributes,
             data.domain.attributes
         )
+
+    def test_summary(self):
+        """Check if status bar is updated when data is received"""
+        input_sum = self.widget.info.set_input_summary = Mock()
+        output_sum = self.widget.info.set_output_summary = Mock()
+
+        data = Table("iris")
+        self.send_signal(self.widget.Inputs.data, data)
+        input_sum.assert_called_with(len(data), format_summary_details(data))
+        output = self.get_output(self.widget.Outputs.data)
+        output_sum.assert_called_with(len(output),
+                                      format_summary_details(output))
+
+        input_sum.reset_mock()
+        output_sum.reset_mock()
+        self.send_signal(self.widget.Inputs.data, None)
+        input_sum.assert_called_once()
+        self.assertEqual(input_sum.call_args[0][0].brief, "")
+        output_sum.assert_called_once()
+        self.assertEqual(output_sum.call_args[0][0].brief, "")