<template>
  <div ref="resize" class="resize">
    <div ref="resizeHandle" class="handle-resize" />
    <slot />
  </div>
</template>
<script>
export default {
  name: 'ResizeBox',
  props: {
    resizeConf: {
      type: Object,
      default: () => ({
        width: 280, // 初始寬度
        widthRange: [100, 500] // 寬度范圍
      })
    }
  },
  mounted() {
    this.dragControllerDiv(this.$refs.resize, this.$refs.resizeHandle)
  },
  methods: {
    dragControllerDiv: function(resizeBox, resizeHandle) {
      resizeBox.style.width = this.resizeConf.width + 'px'
      // 鼠標(biāo)按下事件
      resizeHandle.onmousedown = e => {
        const resizeWidth = resizeBox.offsetWidth
        const startX = e.clientX // 水平坐標(biāo)
        // 鼠標(biāo)拖動(dòng)事件
        document.onmousemove = ev => {
          const moveX = ev.clientX
          const moveLen = resizeWidth + (moveX - startX)
          if (this.resizeConf.widthRange[0] <= moveLen && this.resizeConf.widthRange[1] >= moveLen) {
            resizeBox.style.width = moveLen + 'px'
          }
        }
        // 鼠標(biāo)松開事件
        document.onmouseup = function() {
          document.onmousemove = null
          document.onmouseup = null
        }
      }
    }
  }
}
</script>
<style lang="scss" scoped>
.resize {
  background: #fbfbfb;
  position: relative;
  word-wrap: break-word;
  .handle-resize {
    cursor: col-resize;
    position: absolute;
    right: -2px;
    width: 6px;
    height: 50px;
    border-left: 2px solid #c5c5c5;
    border-right: 2px solid #c5c5c5;
    top: calc(50% - 25px);
  }
}
</style>
 

<template>
  <div class="container sa-flex">
    <ResizeBox :resize-conf="resizeConf">
      我是左邊我是左邊我是左邊我是左邊我是左邊我是左邊我是左邊我是左邊我是左邊我是左邊
    </ResizeBox>
    <div class="right sa-flex-1">
      我是右邊我是右邊我是右邊我是右邊我是右邊我是右邊我是右邊我是右邊我是右邊我是右邊
    </div>
  </div>
</template>
<script>
import ResizeBox from './ResizeBox.vue'
export default {
  components: {
    ResizeBox
  },
  data() {
    return {
      resizeConf: {
        width: 280, // 初始寬度
        widthRange: [100, 500] // 寬度范圍
      }
    }
  }
}
</script>
<style lang="scss">
.sa-flex {
  display: flex;
  flex-wrap: no-wrap
}
.sa-flex-1 {
  flex:1
}
.container {
  min-height: 600px;
  background: #eee;
}
</style>