.vular-studio .x-handle{
 width: 3px;
 cursor: w-resize;
 z-index: 10;
}

.vular-studio .y-handle{
 height: 3px;
 cursor: s-resize;
 z-index: 10;
}

<template>
 <div class="bottom-area" :style="{height:height + 'px'}">
 <YHandle @heightChange="heightChange"></YHandle>
 <div class="bottom-inner">
  <slot></slot>
 </div>
 </div>
</template>

<script>
import YHandle from './YHandle.vue'
export default {
 name: 'BottomArea',
 components:{
 YHandle,
 },
 data () {
 return {
  height:220,
 }
 },
 methods: {
 heightChange(movement){
  this.height += movement
  if(this.height < 30){
  this.height = 30
  }
  if(this.height > 600){
  this.height = 600
  }
 },
 },
}
</script>

<template>
 <div class="y-handle"
 @mousedown="mouseDown"
 ></div>
</template>

<script>
export default {
 name: 'YHandle',
 data () {
 return {
  lastY:''
 }
 },

 created () {
 document.addEventListener('mouseup', this.mouseUp)
 },

 destroyed() {
 document.removeEventListener('mouseup', this.mouseUp)
 },


 methods: {
 mouseDown(event){
  document.addEventListener('mousemove', this.mouseMove)
  this.lastY = event.screenY
 },
 mouseMove(event){
  console.log('move')
  this.$emit('heightChange', this.lastY - event.screenY)
  this.lastY = event.screenY
 },
 mouseUp(event){
  this.lastY = ''
  document.removeEventListener('mousemove', this.mouseMove)
 },
 },
}
</script>