Returns a LayoutSlice pointing to layout objects of type `LayoutClass`

def filter(self, *LayoutClasses, **kwargs):
        """
        Returns a LayoutSlice pointing to layout objects of type `LayoutClass`
        """
        self._check_layout()
        max_level = kwargs.pop('max_level', 0)
        greedy = kwargs.pop('greedy', False)
        filtered_layout_objects = self.layout.get_layout_objects(LayoutClasses, max_level=max_level, greedy=greedy)

        return LayoutSlice(self.layout, filtered_layout_objects)