OnScrollEvent OnScrollEvent # Bases: Event['ScrollableControl'] direction # direction: ScrollDirection | None = None event_type # event_type: ScrollType max_scroll_extent # max_scroll_extent: float min_scroll_extent # min_scroll_extent: float overscroll # overscroll: float | None = None pixels # pixels: float scroll_delta # scroll_delta: float | None = None velocity # velocity: float | None = None viewport_dimension # viewport_dimension: float