Data info displayed in the status bar

Orange/widgets/data/owcorrelations.py

@@ -25,6 +25,7 @@
 from Orange.widgets.utils.itemmodels import DomainModel
 from Orange.widgets.utils.signals import Input, Output
 from Orange.widgets.utils.widgetpreview import WidgetPreview
+from Orange.widgets.utils.state_summary import format_summary_details
 from Orange.widgets.visualize.utils import VizRankDialogAttrPair
 from Orange.widgets.widget import OWWidget, AttributeList, Msg
 
@@ -292,6 +293,9 @@ def __init__(self):
         button_box = gui.hBox(self.mainArea)
         button_box.layout().addWidget(self.vizrank.button)
 
+        self.info.set_input_summary(self.info.NoInput)
+        self.info.set_output_summary(self.info.NoOutput)
+
     @staticmethod
     def sizeHint():
         return QSize(350, 400)
@@ -358,6 +362,10 @@ def set_data(self, data):
                     self.Warning.not_enough_vars()
                 else:
                     self.cont_data = SklImpute()(cont_data)
+            self.info.set_input_summary(len(data),
+                                        format_summary_details(data))
+        else:
+            self.info.set_input_summary(self.info.NoInput)
         self.set_feature_model()
         self.openContext(self.cont_data)
         self.apply()
@@ -380,8 +388,12 @@ def apply(self):
             self.commit()
 
     def commit(self):
+        self.Outputs.data.send(self.data)
+        summary = len(self.data) if self.data else self.info.NoOutput
+        details = format_summary_details(self.data) if self.data else ""
+        self.info.set_output_summary(summary, details)
+
         if self.data is None or self.cont_data is None:
-            self.Outputs.data.send(self.data)
             self.Outputs.features.send(None)
             self.Outputs.correlations.send(None)
             return
@@ -401,7 +413,6 @@ def commit(self):
         corr_table = Table(domain, x, metas=m)
         corr_table.name = "Correlations"
 
-        self.Outputs.data.send(self.data)
         # data has been imputed; send original attributes
         self.Outputs.features.send(AttributeList(
             [self.data.domain[name] for name, _ in self.selection]))

Orange/widgets/data/tests/test_owcorrelations.py

@@ -1,5 +1,5 @@
 # Test methods with long descriptive names can omit docstrings
-# pylint: disable=missing-docstring, protected-access
+# pylint: disable=missing-docstring, protected-access, unsubscriptable-object
 import time
 import unittest
 from unittest.mock import patch, Mock
@@ -19,6 +19,7 @@
 from Orange.widgets.tests.utils import simulate
 from Orange.widgets.visualize.owscatterplot import OWScatterPlot
 from Orange.widgets.widget import AttributeList
+from Orange.widgets.utils.state_summary import format_summary_details
 
 
 class TestOWCorrelations(WidgetTest):
@@ -301,6 +302,26 @@ def test_send_report(self):
         self.send_signal(self.widget.Inputs.data, None)
         self.widget.report_button.click()
 
+    def test_summary(self):
+        """Check if status bar is updated when data is received"""
+        data = Table("iris")
+        input_sum = self.widget.info.set_input_summary = Mock()
+        output_sum = self.widget.info.set_output_summary = Mock()
+
+        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, "")
+
 
 class TestCorrelationRank(WidgetTest):
     @classmethod