1 | import ResizeObserver from 'resize-observer-polyfill';
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2 | import { debounce } from 'throttle-debounce';
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3 |
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4 | const isServer = typeof window === 'undefined';
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5 |
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6 |
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7 | const resizeHandler = function(entries) {
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8 | for (let entry of entries) {
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9 | const listeners = entry.target.__resizeListeners__ || [];
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10 | if (listeners.length) {
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11 | listeners.forEach(fn => {
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12 | fn();
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13 | });
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14 | }
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15 | }
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16 | };
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17 |
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18 |
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19 | export const addResizeListener = function(element, fn) {
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20 | if (isServer) return;
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21 | if (!element.__resizeListeners__) {
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22 | element.__resizeListeners__ = [];
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23 | element.__ro__ = new ResizeObserver(debounce(16, resizeHandler));
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24 | element.__ro__.observe(element);
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25 | }
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26 | element.__resizeListeners__.push(fn);
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27 | };
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28 |
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29 |
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30 | export const removeResizeListener = function(element, fn) {
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31 | if (!element || !element.__resizeListeners__) return;
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32 | element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1);
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33 | if (!element.__resizeListeners__.length) {
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34 | element.__ro__.disconnect();
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35 | }
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36 | };
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