85 lines
2.0 KiB
JavaScript
85 lines
2.0 KiB
JavaScript
import warning from 'warning'
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let scrollbarSize
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// Measure scrollbar width for padding body during modal show/hide
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const scrollbarMeasure = {
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position: 'absolute',
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top: '-9999px',
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width: '50px',
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height: '50px',
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overflow: 'scroll',
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}
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export function measureScrollbar (direction = 'vertical') {
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if (typeof document === 'undefined' || typeof window === 'undefined') {
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return 0
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}
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if (scrollbarSize) {
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return scrollbarSize
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}
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const scrollDiv = document.createElement('div')
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for (const scrollProp in scrollbarMeasure) {
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if (scrollbarMeasure.hasOwnProperty(scrollProp)) {
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scrollDiv.style[scrollProp] = scrollbarMeasure[scrollProp]
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}
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}
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document.body.appendChild(scrollDiv)
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let size = 0
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if (direction === 'vertical') {
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size = scrollDiv.offsetWidth - scrollDiv.clientWidth
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} else if (direction === 'horizontal') {
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size = scrollDiv.offsetHeight - scrollDiv.clientHeight
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}
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document.body.removeChild(scrollDiv)
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scrollbarSize = size
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return scrollbarSize
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}
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export function debounce (func, wait, immediate) {
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let timeout
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function debounceFunc () {
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const context = this
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const args = arguments
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// https://fb.me/react-event-pooling
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if (args[0] && args[0].persist) {
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args[0].persist()
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}
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const later = () => {
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timeout = null
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if (!immediate) {
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func.apply(context, args)
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}
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}
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const callNow = immediate && !timeout
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clearTimeout(timeout)
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timeout = setTimeout(later, wait)
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if (callNow) {
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func.apply(context, args)
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}
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}
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debounceFunc.cancel = function cancel () {
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if (timeout) {
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clearTimeout(timeout)
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timeout = null
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}
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}
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return debounceFunc
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}
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const warned = {}
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export function warningOnce (condition, format, args) {
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if (!warned[format]) {
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warning(condition, format, args)
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warned[format] = !condition
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}
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}
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export function remove (array, item) {
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const index = array.indexOf(item)
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const front = array.slice(0, index)
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const last = array.slice(index + 1, array.length)
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return front.concat(last)
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}
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