import ResizeObserver from 'resize-observer-polyfill';
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import { debounce } from 'throttle-debounce';
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const isServer = typeof window === 'undefined';
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/* istanbul ignore next */
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const resizeHandler = function(entries) {
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for (let 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 const addResizeListener = function(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(debounce(16, 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 const removeResizeListener = function(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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