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

Orange/widgets/data/owdatainfo.py

@@ -4,6 +4,7 @@
 
 from Orange.widgets import widget, gui
 from Orange.widgets.utils.widgetpreview import WidgetPreview
+from Orange.widgets.utils.state_summary import format_summary_details
 from Orange.widgets.widget import Input
 from Orange.data.table import Table
 from Orange.data import StringVariable, DiscreteVariable, ContinuousVariable
@@ -42,6 +43,8 @@ def __init__(self):
                           addSpace=False and box != "Meta Attributes")
             gui.label(bo, self, "%%(%s)s" % name)
 
+        self.info.set_input_summary(self.info.NoInput)
+
         # ensure the widget has some decent minimum width.
         self.targets = "Categorical outcome with 123 values"
         self.layout().activate()
@@ -56,7 +59,9 @@ def __init__(self):
     def data(self, data):
         if data is None:
             self._clear_fields()
+            self.info.set_input_summary(self.info.NoInput)
         else:
+            self.info.set_input_summary(len(data), format_summary_details(data))
             self._set_fields(data)
             self._set_report(data)
 

Orange/widgets/data/tests/test_owdatainfo.py

@@ -1,8 +1,11 @@
 # Test methods with long descriptive names can omit docstrings
-# pylint: disable=missing-docstring
+# pylint: disable=missing-docstring,unsubscriptable-object
+from unittest.mock import Mock
+
 from Orange.data import Table
 from Orange.widgets.data.owdatainfo import OWDataInfo
 from Orange.widgets.tests.base import WidgetTest
+from Orange.widgets.utils.state_summary import format_summary_details
 
 
 class TestOWDataInfo(WidgetTest):
@@ -25,3 +28,14 @@ def test_data_attributes(self):
         data = Table("iris")
         data.attributes = {"att 1": 1, "att 2": True, "att 3": 3}
         self.send_signal(self.widget.Inputs.data, data)
+
+    def test_summary(self):
+        """Check if the status bar is updated when data is received"""
+        data = Table("iris")
+        input_sum = self.widget.info.set_input_summary = Mock()
+        self.send_signal(self.widget.Inputs.data, data)
+        input_sum.assert_called_with(len(data), format_summary_details(data))
+        input_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, "")