refactor[ScrollBar]: use el-scrollbar (#646)

src/components/ScrollBar/index.vue

@@ -1,57 +0,0 @@
-<template>
-  <div class="scroll-container" ref="scrollContainer" @wheel.prevent="handleScroll" >
-    <div class="scroll-wrapper" ref="scrollWrapper" :style="{top: top + 'px'}">
-      <slot></slot>
-    </div>
-  </div>
-</template>
-
-<script>
-const delta = 15
-
-export default {
-  name: 'scrollBar',
-  data() {
-    return {
-      top: 0
-    }
-  },
-  methods: {
-    handleScroll(e) {
-      const eventDelta = e.wheelDelta || -e.deltaY * 3
-      const $container = this.$refs.scrollContainer
-      const $containerHeight = $container.offsetHeight
-      const $wrapper = this.$refs.scrollWrapper
-      const $wrapperHeight = $wrapper.offsetHeight
-      if (eventDelta > 0) {
-        this.top = Math.min(0, this.top + eventDelta)
-      } else {
-        if ($containerHeight - delta < $wrapperHeight) {
-          if (this.top < -($wrapperHeight - $containerHeight + delta)) {
-            this.top = this.top
-          } else {
-            this.top = Math.max(this.top + eventDelta, $containerHeight - $wrapperHeight - delta)
-          }
-        } else {
-          this.top = 0
-        }
-      }
-    }
-  }
-}
-</script>
-
-<style rel="stylesheet/scss" lang="scss" scoped>
-@import '../../styles/variables.scss';
-
-.scroll-container {
-  position: relative;
-  width: 100%;
-  height: 100%;
-  background-color: $menuBg;
-  .scroll-wrapper {
-    position: absolute;
-     width: 100%!important;
-  }
-}
-</style>