OWHeatMap: Show/hide information messages

Author: VesnaT

Orange/widgets/visualize/owheatmap.py

@@ -1295,8 +1295,12 @@ def enable(item, state):
             col_clust_msg = "Column clustering was disabled due to the " \
                             "input matrix being to big"
 
-        self.Information.row_clust(row_clust_msg)
-        self.Information.col_clust(col_clust_msg)
+        self.Information.row_clust.clear()
+        self.Information.col_clust.clear()
+        if row_clust_msg:
+            self.Information.row_clust(row_clust_msg)
+        if col_clust_msg:
+            self.Information.col_clust(col_clust_msg)
 
         self.sort_rows = sort_rows
         self.sort_columns = sort_cols

Orange/widgets/visualize/tests/test_owheatmap.py

@@ -1,6 +1,7 @@
 # Test methods with long descriptive names can omit docstrings
 # pylint: disable=missing-docstring
 from Orange.data import Table
+from Orange.preprocess import Continuize
 from Orange.widgets.visualize.owheatmap import OWHeatMap
 from Orange.widgets.tests.base import WidgetTest
 
@@ -10,6 +11,7 @@ def setUp(self):
         self.widget = self.create_widget(OWHeatMap)
         self.iris = Table("iris")
         self.housing = Table("housing")
+        self.titanic = Table("titanic")
 
     def test_input_data(self):
         """Check widget's data with data on the input"""
@@ -27,3 +29,12 @@ def test_error_message(self):
         self.assertTrue(self.widget.Error.active)
         self.send_signal("Data", self.iris)
         self.assertFalse(self.widget.Error.active)
+
+    def test_information_message(self):
+        self.widget.sort_rows = self.widget.OrderedClustering
+        continuizer = Continuize()
+        cont_titanic = continuizer(self.titanic)
+        self.send_signal("Data", cont_titanic)
+        self.assertTrue(self.widget.Information.active)
+        self.send_signal("Data", self.iris)
+        self.assertFalse(self.widget.Information.active)