@mantine/core/esm/components/ScrollArea/utils/get-scroll-position-from-pointer.mjs

React components library focused on usability, accessibility and developer experience

'use client';
import { getThumbSize } from './get-thumb-size.mjs';
import { linearScale } from './linear-scale.mjs';

function getScrollPositionFromPointer(pointerPos, pointerOffset, sizes, dir = "ltr") {
  const thumbSizePx = getThumbSize(sizes);
  const thumbCenter = thumbSizePx / 2;
  const offset = pointerOffset || thumbCenter;
  const thumbOffsetFromEnd = thumbSizePx - offset;
  const minPointerPos = sizes.scrollbar.paddingStart + offset;
  const maxPointerPos = sizes.scrollbar.size - sizes.scrollbar.paddingEnd - thumbOffsetFromEnd;
  const maxScrollPos = sizes.content - sizes.viewport;
  const scrollRange = dir === "ltr" ? [0, maxScrollPos] : [maxScrollPos * -1, 0];
  const interpolate = linearScale([minPointerPos, maxPointerPos], scrollRange);
  return interpolate(pointerPos);
}

export { getScrollPositionFromPointer };
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