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// @flow import type { Placement } from '../enums'; import type { ModifierArguments, Modifier, Rect, Offsets } from '../types'; import getBasePlacement from '../utils/getBasePlacement'; import { top, left, right, placements } from '../enums';
// eslint-disable-next-line import/no-unused-modules export type OffsetsFunction = ({ popper: Rect, reference: Rect, placement: Placement, }) => [?number, ?number];
type Offset = OffsetsFunction | [?number, ?number];
// eslint-disable-next-line import/no-unused-modules export type Options = { offset: Offset, };
export function distanceAndSkiddingToXY( placement: Placement, rects: { popper: Rect, reference: Rect }, offset: Offset ): Offsets { const basePlacement = getBasePlacement(placement); const invertDistance = [left, top].indexOf(basePlacement) >= 0 ? -1 : 1;
let [skidding, distance] = typeof offset === 'function' ? offset({ ...rects, placement, }) : offset;
skidding = skidding || 0; distance = (distance || 0) * invertDistance;
return [left, right].indexOf(basePlacement) >= 0 ? { x: distance, y: skidding } : { x: skidding, y: distance }; }
function offset({ state, options, name }: ModifierArguments<Options>) { const { offset = [0, 0] } = options;
const data = placements.reduce((acc, placement) => { acc[placement] = distanceAndSkiddingToXY(placement, state.rects, offset); return acc; }, {});
const { x, y } = data[state.placement];
if (state.modifiersData.popperOffsets != null) { state.modifiersData.popperOffsets.x += x; state.modifiersData.popperOffsets.y += y; }
state.modifiersData[name] = data; }
// eslint-disable-next-line import/no-unused-modules export type OffsetModifier = Modifier<'offset', Options>; export default ({ name: 'offset', enabled: true, phase: 'main', requires: ['popperOffsets'], fn: offset, }: OffsetModifier);
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