/*
 * @Author: daidai
 * @Date: 2022-02-28 10:48:02
 * @LastEditors: Please set LastEditors
 * @LastEditTime: 2022-04-26 14:55:41
 * @FilePath: \web-pc\src\pages\big-screen\utils\drawMixin.js
 */
// 屏幕适配 mixin 函数

// * 默认缩放值
const scale = {
  width: '1',
  height: '1',
}

// * 设计稿尺寸（px）
const baseWidth = 1920
const baseHeight = 1080

// * 需保持的比例（默认1.77778）
const baseProportion = parseFloat((baseWidth / baseHeight).toFixed(5))

export default {
  data() {
    return {
      // * 定时函数
      drawTiming: null,
    }
  },
  computed: {
    isScale(){
      return this.$store.state.setting.isScale
    }
  },
  mounted () {
    if(!this.isScale){
      return
    }
    this.calcRate()
    window.addEventListener('resize', this.resize)
  },
  beforeDestroy () {
       window.removeEventListener('resize', this.resize)
  },
  methods: {
    calcRate () {
      const appRef = this.$refs["appRef"]
      if (!appRef) return 
      // 当前宽高比
      const currentRate = parseFloat((window.innerWidth / window.innerHeight).toFixed(5))
      if (appRef) {
        if (currentRate > baseProportion) {
          // 表示更宽
          scale.width = ((window.innerHeight * baseProportion) / baseWidth).toFixed(5)
          scale.height = (window.innerHeight / baseHeight).toFixed(5)
          appRef.style.transform = `scale(${scale.width}, ${scale.height}) translate(-50%, -50%)`
        } else {
          // 表示更高
          scale.height = ((window.innerWidth / baseProportion) / baseHeight).toFixed(5)
          scale.width = (window.innerWidth / baseWidth).toFixed(5)
          appRef.style.transform = `scale(${scale.width}, ${scale.height}) translate(-50%, -50%)`
        }
      }
    },
    resize () {
      if(!this.isScale){
        return
      }
      clearTimeout(this.drawTiming)
      this.drawTiming = setTimeout(() => {
        this.calcRate()
      }, 200)
    }
  },
}