@scrolia/react-native/dist/hooks/content/functions/length.mjs

A headless scrollbar component

import { tryPlugin } from "../../../functions/plugin.mjs";

const setLengthFn = ({ axis, disabled, animated, plugins, hvTrack, hvThumb, total, view, viewOffset, scrollbarLength, setScrollbarLength }) => {
	return () => {
		const _total = total.current;
		const _view = view.current;
		const _viewOffset = viewOffset.current;
		const scrollbarLengthNext = _view / _total * _view;
		let result;
		for (const plugin of plugins) {
			if (!plugin.onSetLength) continue;
			result = tryPlugin(plugin, plugin.onSetLength, {
				axis,
				isDisabled: disabled,
				isAnimated: animated,
				isDefined: hvTrack && hvThumb,
				total: _total,
				view: _view,
				viewOffset: _viewOffset,
				scrollbarLengthPrev: scrollbarLength,
				scrollbarLengthNext: result?.scrollbarLength ?? scrollbarLengthNext
			}) ?? result;
		}
		let length;
		if (result?.scrollbarLength) length = result.scrollbarLength;
		else length = scrollbarLengthNext;
		if (_view >= _total) setScrollbarLength(0);
		else setScrollbarLength(length);
	};
};

export { setLengthFn };
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