+
+ virtual bool IsEditable() const = 0;
+
+ virtual void Undo() = 0;
+ virtual void Redo() = 0;
+ virtual void SelectAll() = 0;
+
+ virtual bool CanCopy() const = 0;
+ virtual bool CanCut() const = 0;
+ virtual bool CanPaste() const = 0;
+ virtual bool CanUndo() const = 0;
+ virtual bool CanRedo() const = 0;
+
+ // may return value different from GetSelection() when the combobox
+ // dropdown is shown and the user selected, but not yet accepted, a value
+ // different from the old one in it
+ virtual int GetCurrentSelection() const { return GetSelection(); }
+
+ // redeclare inherited SetSelection() overload here as well to avoid
+ // virtual function hiding
+ virtual void SetSelection(int n) = 0;