element-nice-ui/src/utils/resize-event.js

A Component Library for Vue.js.

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__ || []
    listeners.forEach(fn => fn())
  }
}

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)
}

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()
  }
}