import { debounce } from '@/utils'
  
  export default {
    data() {
      return {
        $_sidebarElm: null,
        $_resizeHandler: null
      }
    },
    mounted() {
      this.initListener()
    },
    activated() {
      if (!this.$_resizeHandler) {
        // avoid duplication init
        this.initListener()
      }
  
      // when keep-alive chart activated, auto resize
      this.resize()
    },
    beforeDestroy() {
      this.destroyListener()
    },
    deactivated() {
      this.destroyListener()
    },
    methods: {
      // use $_ for mixins properties
      // https://vuejs.org/v2/style-guide/index.html#Private-property-names-essential
      $_sidebarResizeHandler(e) {
        if (e.propertyName === 'width') {
          this.$_resizeHandler()
        }
      },
      initListener() {
        this.$_resizeHandler = debounce(() => {
          this.resize()
        }, 100)
        window.addEventListener('resize', this.$_resizeHandler)
  
        this.$_sidebarElm = document.getElementsByClassName('sidebar-container')[0]
        this.$_sidebarElm && this.$_sidebarElm.addEventListener('transitionend', this.$_sidebarResizeHandler)
      },
      destroyListener() {
        window.removeEventListener('resize', this.$_resizeHandler)
        this.$_resizeHandler = null
  
        this.$_sidebarElm && this.$_sidebarElm.removeEventListener('transitionend', this.$_sidebarResizeHandler)
      },
      resize() {
        const { chart } = this
        chart && chart.resize()
      }
    }
  }