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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | import { useState } from 'react'; import useInterval from 'react-useinterval'; import difference from 'lodash/difference'; import values from 'lodash/values'; import { DROPDOWN_PALCEMENT_BL } from './constants'; function getDropDownCss(bindTo, placement) { if (!bindTo.current) return null; const rect = bindTo.current.getBoundingClientRect(); const top = rect.height + rect.top + 2; switch (placement) { case DROPDOWN_PALCEMENT_BL: return { left: rect.left, top, }; default: return { right: window.innerWidth - (rect.left + rect.width), top, }; } } export default (bindTo, placement) => { const defaultState = getDropDownCss(bindTo, placement); const [state, replaceState] = useState(defaultState); function observeChanges() { const nextState = getDropDownCss(bindTo, placement); const diff = difference(values(nextState), values(state)); if (diff.length) replaceState(nextState); } useInterval(observeChanges, 32); return state; }; |