scrollDirectionHandler function

void scrollDirectionHandler({ required ValueChanged<bool> function, required ScrollController scrollController, })

Handles the scroll direction and triggers a callback function based on the scroll direction.

This function monitors the scroll direction of the provided ScrollController. If the user scrolls down (reverse), it triggers the callback function with true. If the user scrolls up (forward), it triggers the callback function with false.

[function] - A callback function that takes a boolean value indicating the scroll direction. [scrollController] - The ScrollController that monitors the scroll position.

Example:

ScrollController _scrollController = ScrollController();
scrollDirectionHandler(
  function: (isScrollingDown) {
    if (isScrollingDown) {
      print('Scrolling down');
    } else {
      print('Scrolling up');
    }
  },
  scrollController: _scrollController,
);

Implementation

void scrollDirectionHandler({required ValueChanged<bool> function, required ScrollController scrollController}) {
  if (scrollController.position.userScrollDirection == ScrollDirection.reverse) {
    function(true);
  }
  if (scrollController.position.userScrollDirection == ScrollDirection.forward) {
    function(false);
  }
}