Vue.js桌面端自定义滚动条组件之美化滚动条VScroll

props: {
 // 是否显示原生滚动条
 native: Boolean,
 // 是否自动隐藏滚动条
 autohide: Boolean,
 // 滚动条尺寸
 size: { type: [Number, String], default: '' },
 // 滚动条颜色
 color: String,
 // 滚动条层级
 zIndex: null
},

<!-- 设置原生滚动条 -->
<v-scroll native>
 <img src="https://cn.vuejs.org/images/logo.png" style="max-width:100%;" />
 <p>这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！</p>
</v-scroll>

<!-- 设置自定义参数 -->
<v-scroll autohide size="10" color="#f90" zIndex="2020">
 <img src="https://cn.vuejs.org/images/logo.png" style="max-width:100%;" />
 <p>这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！</p>
</v-scroll>

<!-- //VScroll 自定义滚动条模板 -->
<template>
 <div class="vui__scrollbar" ref="ref__box" @mouseenter="handleMouseEnter" @mouseleave="handleMouseLeave" v-resize="handleResize">
 <div :class="['vscroll__wrap', {native: native}]" ref="ref__wrap" @scroll="handleScroll">
 <div class="vscroll__view" v-resize="handleResize">
 <slot />
 </div>
 </div>
 <!-- //滚动条 -->
 <div :class="['vscroll__bar vertical', {ishide: !isShow}]" @mousedown="handleClickTrack($event, 0)" :style="{'width': parseInt(size)>=0 ? parseInt(size)+'px' : '', 'z-index': parseInt(zIndex)>=0 ? parseInt(zIndex) : ''}">
 <div class="vscroll__thumb" ref="ref__barY" :style="{'background': color, 'height': barHeight+'px'}" @mousedown="handleDragThumb($event, 0)"></div>
 </div>
 <div :class="['vscroll__bar horizontal', {ishide: !isShow}]" @mousedown="handleClickTrack($event, 1)" :style="{'height': parseInt(size)>=0 ? parseInt(size)+'px' : '', 'z-index': parseInt(zIndex)>=0 ? parseInt(zIndex) : ''}">
 <div class="vscroll__thumb" ref="ref__barX" :style="{'background': color, 'width': barWidth+'px'}" @mousedown="handleDragThumb($event, 1)"></div>
 </div>
 </div>
</template>

// 监听元素/DOM尺寸变化
directives: {
 'resize': {
 bind: function(el, binding) {
 let width = '', height = '';
 function get() {
 const elStyle = el.currentStyle ? el.currentStyle : document.defaultView.getComputedStyle(el, null);
 if (width !== elStyle.width || height !== elStyle.height) {
 binding.value({width, height});
 }
 width = elStyle.width;
 height = elStyle.height;
 }
 el.__vueReize__ = setInterval(get, 16);
 },
 unbind: function(el) {
 clearInterval(el.__vueReize__);
 }
 }
},

/**
 * @Desc vue.js自定义滚动条直接VScroll
 * @Time andy by 2020-11-30
 * @About Q：282310962 wx：xy190310
 */
<script>
 import domUtils from './utils/dom'
 export default {
 props: {
 // 是否显示原生滚动条
 native: Boolean,
 // 是否自动隐藏滚动条
 autohide: Boolean,
 // 滚动条尺寸
 size: { type: [Number, String], default: '' },
 // 滚动条颜色
 color: String,
 // 滚动条层级
 zIndex: null
 },
 data() {
 return {
 barWidth: 0, // 滚动条宽度
 barHeight: 0, // 滚动条高度
 ratioX: 1, // 滚动条水平偏移率
 ratioY: 1, // 滚动条垂直偏移率
 isTaped: false, // 鼠标光标是否按住滚动条
 isHover: false, // 鼠标光标是否悬停在滚动区
 isShow: !this.autohide, // 是否显示滚动条
 }
 },
 mounted() {
 this.$ref__box = this.$refs.ref__box
 this.$ref__wrap = this.$refs.ref__wrap
 this.$ref__barY = this.$refs.ref__barY
 this.$ref__barX = this.$refs.ref__barX
 this.$nextTick(this.updated)
 },
 // ...
 methods: {
 // 鼠标移入
 handleMouseEnter() {
 this.isHover = true
 this.isShow = true
 this.updated()
 },

 // 鼠标移出
 handleMouseLeave() {
 this.isHover = false
 this.isShow = false
 },

 // 拖动滚动条
 handleDragThumb(e, index) {
 let _this = this
 this.isTaped = true
 let c = {}
 // 阻止默认事件
 domUtils.isIE() ? (e.returnValue = false, e.cancelBubble = true) : (e.stopPropagation(), e.preventDefault())
 document.onselectstart = () => false

 if(index == 0) {
 c.dragY = true
 c.clientY = e.clientY
 }else {
 c.dragX = true
 c.clientX = e.clientX
 }

 domUtils.on(document, 'mousemove', function(evt) {
 if(_this.isTaped) {
 if(c.dragY) {
 _this.$ref__wrap.scrollTop += (evt.clientY - c.clientY) * _this.ratioY
 _this.$ref__barY.style.transform = `translateY(${_this.$ref__wrap.scrollTop / _this.ratioY}px)`
 c.clientY = evt.clientY
 }
 if(c.dragX) {
 _this.$ref__wrap.scrollLeft += (evt.clientX - c.clientX) * _this.ratioX
 _this.$ref__barX.style.transform = `translateX(${_this.$ref__wrap.scrollLeft / _this.ratioX}px)`
 c.clientX = evt.clientX
 }
 }
 })
 domUtils.on(document, 'mouseup', function() {
 _this.isTaped = false
 
 document.onmouseup = null;
 document.onselectstart = null
 })
 },

 // 点击滚动槽
 handleClickTrack(e, index) {
 console.log(index)
 },

 // 更新滚动区
 updated() {
 if(this.native) return

 // 垂直滚动条
 if(this.$ref__wrap.scrollHeight > this.$ref__wrap.offsetHeight) {
 this.barHeight = this.$ref__box.offsetHeight **2 / this.$ref__wrap.scrollHeight
 this.ratioY = (this.$ref__wrap.scrollHeight - this.$ref__box.offsetHeight) / (this.$ref__box.offsetHeight - this.barHeight)
 this.$ref__barY.style.transform = `translateY(${this.$ref__wrap.scrollTop / this.ratioY}px)`
 }else {
 this.barHeight = 0
 this.$ref__barY.style.transform = ''
 this.$ref__wrap.style.marginRight = ''
 }

 // 水平滚动条
 ...
 },

 // 滚动区元素/DOM尺寸改变
 handleResize() {
 // 更新滚动条状态
 },

 // ...
 }
 }
</script>

<p>
 <span class="vs__btn" @click="handleScrollTo('top')">滚动至顶部</span>
 <span class="vs__btn" @click="handleScrollTo('bottom')">滚动至底部</span>
 <span class="vs__btn" @click="handleScrollTo(150)">滚动至150px</span>
</p>

<v-scroll ref="vscrollRef">
 <img src="https://cn.vuejs.org/images/logo.png" style="height:180px;" />
 <p><img src="https://cn.vuejs.org/images/logo.png" style="height:350px;" /></p>
 <p>这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！</p>
</v-scroll>

// 滚动到指定位置
handleScrollTo(val) {
 this.$refs.vscrollRef.scrollTo(val);
},

<v-scroll @scroll="handleScroll">
 <img src="https://cn.vuejs.org/images/logo.png" style="height:180px;margin-right:10px;" />
 <br />
 <p><img src="https://cn.vuejs.org/images/logo.png" style="height:250px;" /></p>
 <p>这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！这里是内容信息！</p>
</v-scroll>

// 监听滚动事件
handleScroll(e) {
 this.scrollTop = e.target.scrollTop
 // 判断滚动状态
 if(e.target.scrollTop == 0) {
 this.scrollStatus = '到达顶部'
 } else if(e.target.scrollTop + e.target.offsetHeight >= e.target.scrollHeight) {
 this.scrollStatus = '到达底部'
 }else {
 this.scrollStatus = '滚动中....'
 }
},