ENH: Provides control on item enability and selectability for DataView

pyface/data_view/abstract_data_model.py

@@ -235,6 +235,44 @@ def get_value_type(self, row, column):
         """
         raise NotImplementedError()
 
+    def is_enabled(self, row, column):
+        """ Whether the item located at row and column is enabled.
+
+        The default method returns True.
+
+        Parameters
+        ----------
+        row : sequence of int
+            The indices of the row as a sequence from root to leaf.
+        column : sequence of int
+            The indices of the column as a sequence of length 0 or 1.
+
+        Returns
+        -------
+        can_set_value : bool
+            Whether or not the item is enabled.
+        """
+        return True
+
+    def is_selectable(self, row, column):
+        """ Whether the item located at row and column is selectable.
+
+        The default method returns True.
+
+        Parameters
+        ----------
+        row : sequence of int
+            The indices of the row as a sequence from root to leaf.
+        column : sequence of int
+            The indices of the column as a sequence of length 0 or 1.
+
+        Returns
+        -------
+        can_set_value : bool
+            Whether or not the item is selectable.
+        """
+        return True
+
     # Convenience methods
 
     def is_row_valid(self, row):

pyface/ui/qt4/data_view/data_view_item_model.py

@@ -142,14 +142,18 @@ def flags(self, index):
         row = self._to_row_index(index)
         column = self._to_column_index(index)
         value_type = self.model.get_value_type(row, column)
-        if row == () and column == ():
-            return Qt.ItemIsEnabled
-
-        flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable | Qt.ItemIsDragEnabled
-        if is_qt5 and not self.model.can_have_children(row):
-            flags |= Qt.ItemNeverHasChildren
 
+        flags = Qt.ItemIsDragEnabled
         try:
+            if self.model.is_enabled(row, column):
+                flags |= Qt.ItemIsEnabled
+
+            if self.model.is_selectable(row, column):
+                flags |= Qt.ItemIsSelectable
+
+            if is_qt5 and not self.model.can_have_children(row):
+                flags |= Qt.ItemNeverHasChildren
+
             if value_type:
                 if value_type.has_editor_value(self.model, row, column):
                     flags |= Qt.ItemIsEditable