tableview: Automaticaly switch header sorting on/off

Orange/widgets/data/owtable.py

@@ -196,12 +196,6 @@ def _setup_table_view(self):
         else:
             view.setItemDelegate(TableDataDelegate(view))
 
-        # Enable/disable view sorting based on data's type
-        view.setSortingEnabled(is_sortable(data))
-        header = view.horizontalHeader()
-        header.setSectionsClickable(is_sortable(data))
-        header.setSortIndicatorShown(is_sortable(data))
-
         view.setModel(datamodel)
 
         vheader = view.verticalHeader()
@@ -393,15 +387,6 @@ def send_report(self):
         self.report_table(self.view)
 
 
-def is_sortable(table):
-    if isinstance(table, SqlTable):
-        return False
-    elif isinstance(table, Orange.data.Table):
-        return True
-    else:
-        return False
-
-
 if __name__ == "__main__":  # pragma: no cover
     WidgetPreview(OWTable).run(
         input_data=Table("iris"),

Orange/widgets/data/utils/tablesummary.py

@@ -93,15 +93,6 @@ def parts(density, col_dist):
         return Summary(n_instances, domain, X_part, Y_part, M_part)
 
 
-def is_sortable(table: Table) -> bool:
-    if isinstance(table, SqlTable):
-        return False
-    elif isinstance(table, Table):
-        return True
-    else:
-        return False
-
-
 def format_summary(summary: Union[ApproxSummary, Summary]) -> List[str]:
     def format_part(part: Optional[_ArrayStat]) -> str:
         if isinstance(part, DenseArray):

Orange/widgets/data/utils/tableview.py

@@ -1,18 +1,21 @@
 import sys
 from itertools import chain, starmap
-from typing import Sequence, Tuple, cast
+from typing import Sequence, Tuple, cast, Optional
 
 import numpy as np
 
 from AnyQt.QtCore import (
     Qt, QObject, QEvent, QSize, QAbstractProxyModel, QItemSelection,
-    QItemSelectionModel, QItemSelectionRange
+    QItemSelectionModel, QItemSelectionRange, QAbstractItemModel
 )
 from AnyQt.QtGui import QPainter
 from AnyQt.QtWidgets import (
     QStyle, QWidget, QStyleOptionHeader, QAbstractButton
 )
 
+import Orange.data
+import Orange.data.sql.table
+
 from Orange.widgets.data.utils.models import RichTableModel
 from Orange.widgets.utils.itemmodels import TableModel
 from Orange.widgets.utils.itemselectionmodel import (
@@ -99,13 +102,33 @@ def cornerButtonClicked(self):
             self.selectAll()
 
 
+def source_model(model: QAbstractItemModel) -> Optional[QAbstractItemModel]:
+    while isinstance(model, QAbstractProxyModel):
+        model = model.sourceModel()
+    return model
+
+
+def is_table_sortable(table):
+    if isinstance(table, Orange.data.sql.table.SqlTable):
+        return False
+    elif isinstance(table, Orange.data.Table):
+        return True
+    else:
+        return False
+
+
 class RichTableView(DataTableView):
     """
     The preferred table view for RichTableModel.
 
     Handles the display of variable's labels keys in top left corner.
     """
-    def setModel(self, model: RichTableModel):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        header = self.horizontalHeader()
+        header.setSortIndicator(-1, Qt.AscendingOrder)
+
+    def setModel(self, model: QAbstractItemModel):
         current = self.model()
         if current is not None:
             current.headerDataChanged.disconnect(self.__headerDataChanged)
@@ -117,6 +140,25 @@ def setModel(self, model: RichTableModel):
             sel_model = BlockSelectionModel(model, selectBlocks=not select_rows)
             self.setSelectionModel(sel_model)
 
+            sortable = self.isModelSortable(model)
+            self.setSortingEnabled(sortable)
+            header = self.horizontalHeader()
+            header.setSectionsClickable(sortable)
+            header.setSortIndicatorShown(sortable)
+
+    def isModelSortable(self, model: QAbstractItemModel) -> bool:
+        """
+        Should the `model` be sortable via the view header click.
+
+        This predicate is called when a model is set on the view and
+        enables/disables the model sorting and header section sort indicators.
+        """
+        model = source_model(model)
+        if isinstance(model, TableModel):
+            table = model.source
+            return is_table_sortable(table)
+        return False
+
     def __headerDataChanged(
             self,
             orientation: Qt.Orientation,

Orange/widgets/obsolete/owtable.py

@@ -259,11 +259,7 @@ def _setup_table_view(self, view, data):
         else:
             view.setItemDelegate(TableDataDelegate(view))
 
-        # Enable/disable view sorting based on data's type
-        view.setSortingEnabled(is_sortable(data))
         header = view.horizontalHeader()
-        header.setSectionsClickable(is_sortable(data))
-        header.setSortIndicatorShown(is_sortable(data))
         header.sortIndicatorChanged.connect(self.update_selection)
 
         view.setModel(datamodel)
@@ -526,15 +522,6 @@ def send_report(self):
         self.report_table(view)
 
 
-def is_sortable(table):
-    if isinstance(table, SqlTable):
-        return False
-    elif isinstance(table, Orange.data.Table):
-        return True
-    else:
-        return False
-
-
 if __name__ == "__main__":  # pragma: no cover
     WidgetPreview(OWDataTable).run(
         insert_dataset=[