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