pointerScroll method Null safety
- double delta
Changes the scrolling position based on a pointer signal from current value to delta without animation and without checking if new value is in range, taking min/max scroll extent into account.
Any active animation is canceled. If the user is currently scrolling, that action is canceled.
This method dispatches the start/update/end sequence of scrolling notifications.
// TODO(YeungKC): Support trackpad scroll, https://github.com/flutter/flutter/issues/23604. void pointerScroll(double delta);