def applied_scroll_offsets(self):
        """
        Return a :class:`.ScrollOffsets` instance that indicates the actual
        offset. This can be less than or equal to what's configured. E.g, when
        the cursor is completely at the top, the top offset will be zero rather
        than what's configured.
        """
        if self.displayed_lines[0] == 0:
            top = 0
        else:
            # Get row where the cursor is displayed.
            y = self.input_line_to_visible_line[self.ui_content.cursor_position.y]
            top = min(y, self.configured_scroll_offsets.top)

        return ScrollOffsets(
            top=top,
            bottom=min(self.ui_content.line_count - self.displayed_lines[-1] - 1,
                       self.configured_scroll_offsets.bottom),

            # For left/right, it probably doesn't make sense to return something.
            # (We would have to calculate the widths of all the lines and keep
            # double width characters in mind.)
            left=0, right=0)