protected override void OnMouseMove(MouseEventArgs e) {
     var selectionCmd = new TextSelectionCommand(textView, selectionView, caretView);
     var canExecuteSelection = selectionCmd.CanExecute(e);
     
     if (canExecuteSelection) {
         selectionCmd.Execute(e);
     }
 }
        protected override void OnKeyDown(KeyEventArgs e) {
            var removeTextCmd = new RemoveTextCommand(textView, caretView, selectionView);
            var caretMoveCmd = new CaretMoveCommand(caretView, textView);
            var selectionCmd = new TextSelectionCommand(textView, selectionView, caretView);
            var deselectionCmd = new TextDeselectionCommand(selectionView);

            if (removeTextCmd.CanExecute(e)) {
                ExecuteTextCommand(removeTextCmd, new UndoRemoveTextCommand(textView, caretView), e);
                deselectionCmd.Execute();
            } else if (caretMoveCmd.CanExecute(e)) {
                caretMoveCmd.Execute(e);
                deselectionCmd.Execute();
            } else if (selectionCmd.CanExecute(e)) {
                selectionCmd.Execute(e);
            }
        }
        protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e) {
            var selectionCmd = new TextSelectionCommand(textView, selectionView, caretView);

            if (selectionCmd.CanExecute(e)) {
                selectionCmd.Execute(e);
            }
        }