2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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import ResizeObserver from 'resize-observer-polyfill';
const isServer = typeof window === 'undefined';
/* istanbul ignore next */
const resizeHandler = function(entries) {
for (let entry of entries) {
const listeners = entry.target.__resizeListeners__ || [];
if (listeners.length) {
listeners.forEach(fn => {
fn();
});
}
}
};
/* istanbul ignore next */
export const addResizeListener = function(element, fn) {
if (isServer) return;
if (!element.__resizeListeners__) {
element.__resizeListeners__ = [];
element.__ro__ = new ResizeObserver(resizeHandler);
element.__ro__.observe(element);
}
element.__resizeListeners__.push(fn);
};
/* istanbul ignore next */
export const removeResizeListener = function(element, fn) {
if (!element || !element.__resizeListeners__) return;
element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1);
if (!element.__resizeListeners__.length) {
element.__ro__.disconnect();
}
};
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