43 lines
1.1 KiB
JavaScript
43 lines
1.1 KiB
JavaScript
import ResizeObserver from 'resize-observer-polyfill'
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const isServer = typeof window === 'undefined'
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/* istanbul ignore next */
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function resizeHandler(entries) {
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for (const entry of entries) {
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const listeners = entry.target.__resizeListeners__ || []
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if (listeners.length) {
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listeners.forEach((fn) => {
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fn()
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})
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}
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}
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}
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/* istanbul ignore next */
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export function addResizeListener(element, fn) {
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if (isServer) return
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if (!element.__resizeListeners__) {
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element.__resizeListeners__ = []
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element.__ro__ = new ResizeObserver(resizeHandler)
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element.__ro__.observe(element)
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}
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element.__resizeListeners__.push(fn)
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}
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/* istanbul ignore next */
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export function removeResizeListener(element, fn) {
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if (!element || !element.__resizeListeners__) return
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element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1)
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if (!element.__resizeListeners__.length) {
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element.__ro__.disconnect()
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}
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}
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export function triggerWindowResize() {
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const event = document.createEvent('HTMLEvents')
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event.initEvent('resize', true, true)
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;(event).eventType = 'message'
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window.dispatchEvent(event)
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}
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