vue+element 实现 tagsView 性能
胜利后示例
- vuex store 去存储浏览过的菜单；
目录构造
// 新建 tagsView.js
const tagsView = {
state: {visitedViews: [],
cachedViews: []},
mutations: {ADD_VISITED_VIEWS: (state, view) => {if (state.visitedViews.some(v => v.path === view.path)) return
state.visitedViews.push(Object.assign({}, view, {title: view.meta.title || 'no-name'}))
if (!view.meta.noCache) {state.cachedViews.push(view.name)
}
},
DEL_VISITED_VIEWS: (state, view) => {for (const [i, v] of state.visitedViews.entries()) {if (v.path === view.path) {state.visitedViews.splice(i, 1)
break
}
}
for (const i of state.cachedViews) {if (i === view.name) {const index = state.cachedViews.indexOf(i)
state.cachedViews.splice(index, 1)
break
}
}
},
DEL_OTHERS_VIEWS: (state, view) => {for (const [i, v] of state.visitedViews.entries()) {if (v.path === view.path) {state.visitedViews = state.visitedViews.slice(i, i + 1)
break
}
}
for (const i of state.cachedViews) {if (i === view.name) {const index = state.cachedViews.indexOf(i)
state.cachedViews = state.cachedViews.slice(index, i + 1)
break
}
}
},
DEL_ALL_VIEWS: (state) => {state.visitedViews = []
state.cachedViews = []}
},
actions: {addVisitedViews({ commit}, view) {commit('ADD_VISITED_VIEWS', view)
},
delVisitedViews({commit, state}, view) {return new Promise((resolve) => {commit('DEL_VISITED_VIEWS', view)
resolve([...state.visitedViews])
})
},
delOthersViews({commit, state}, view) {return new Promise((resolve) => {commit('DEL_OTHERS_VIEWS', view)
resolve([...state.visitedViews])
})
},
delAllViews({commit, state}) {return new Promise((resolve) => {commit('DEL_ALL_VIEWS')
resolve([...state.visitedViews])
})
}
}
}
export default tagsView- 文件夹 store 中 index.js 引入方才新建的 tagsView.js，并放入 modules 模块中去
import tagsView from './modules/tagsView'
// 后面 state，mutations，getters，actions... 省略
modules: {tagsView}
- 新建
tagsView文件夹（index.vue,scrollPane.vue）目录构造本人定，我是放在了 components 里的 common 文件夹；
//index.vue
<template>
<div class="tags-view-container">
<scroll-pane class="tags-view-wrapper" ref="scrollPane">
<router-link ref="tag" :class="isActive(tag)?'active':''" class="tags-view-item" :to="tag" @contextmenu.prevent.native="openMenu(tag,$event)" v-for="tag in Array.from(visitedViews)" :key="tag.path" >
{{tag.title}}
<span class="el-icon-close" @click.prevent.stop='closeSelectedTag(tag)'></span>
</router-link>
</scroll-pane>
<ul class='contextmenu' v-show="visible" :style="{left:left+'px',top:top+'px'}">
<li @click="closeSelectedTag(selectedTag)"> 敞开 </li>
<li @click="closeOthersTags"> 敞开其余 </li>
<li @click="closeAllTags"> 敞开所有 </li>
</ul>
</div>
</template>
<script>
// 留神文件门路
import ScrollPane from '@/components/common/TagsView/ScrollPane'
export default {
name: "tags-view",
components: {ScrollPane},
data(){
return{
visible: false,
top: 0,
left: 0,
selectedTag: {}}
},
computed:{visitedViews(){console.log('tabView')
console.log(this.$store.state.tagsView)
// console.log(this.$store.state)
return this.$store.state.tagsView.visitedViews
}
},
watch:{$route(){this.addViewTags()
this.moveToCurrentTag()},
visible(value) {if (value) {document.body.addEventListener('click', this.closeMenu)
} else {document.body.removeEventListener('click', this.closeMenu)
}
}
},
mounted() {this.addViewTags()
},
methods:{generateRoute(){// console.log(this.$route.name)
if (this.$route.path) {return this.$route}
return false
},
isActive(route) {return route.path === this.$route.path},
addViewTags() {const route = this.generateRoute()
// console.log(route)
if (!route) {return false}
this.$store.dispatch('addVisitedViews', route)
},
moveToCurrentTag() {
const tags = this.$refs.tag
this.$nextTick(() => {for (const tag of tags) {if (tag.to.path === this.$route.path) {this.$refs.scrollPane.moveToTarget(tag.$el)
break
}
}
})
},
closeSelectedTag(view) {this.$store.dispatch('delVisitedViews', view).then((views) => {if (this.isActive(view)) {const latestView = views.slice(-1)[0]
if (latestView) {this.$router.push(latestView)
} else {this.$router.push('/')
}
}
})
},
closeOthersTags() {this.$router.push(this.selectedTag)
this.$store.dispatch('delOthersViews', this.selectedTag).then(() => {this.moveToCurrentTag()
})
},
closeAllTags() {this.$store.dispatch('delAllViews')
this.$router.push('/')
},
openMenu(tag, e) {
this.visible = true
this.selectedTag = tag
const offsetLeft = this.$el.getBoundingClientRect().left // container margin left
this.left = e.clientX - offsetLeft + 15 // 15: margin right
this.top = e.clientY
},
closeMenu() {this.visible = false}
}
}
</script>
<style scoped>
.tags-view-wrapper {
background: #fff;
height: 54px;
border-bottom: 1px solid #d8dce5;
box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);
}
.tags-view-item {
display: inline-block;
position: relative;
height: 30px;
line-height: 30px;
border: 1px solid #d8dce5;
color: #495060;
background: #fff;
padding: 0 8px;
font-size: 12px;
margin-left: 5px;
margin-top: 4px;
}
.tags-view-item:first-of-type {margin-left: 15px;}
.tags-view-item.active{
background-color: #42b983;
color: #fff;
border-color: #42b983;
}
.tags-view-item.active::before{
content: '';
background: #fff;
display: inline-block;
width: 8px;
height: 8px;
border-radius: 50%;
position: relative;
top: -1px;
margin-right: 2px;
}
.contextmenu {
margin: 0;
background: #fff;
z-index: 100;
position: absolute;
list-style-type: none;
padding: 5px 0;
border-radius: 4px;
font-size: 12px;
font-weight: 400;
color: #333;
box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);
}
.contextmenu li{
margin: 0;
padding: 7px 16px;
cursor: pointer;
}
.contextmenu li:hover{background: #eee;}
.tags-view-item .el-icon-close{
width: 16px;
height: 16px;
border-radius: 50%;
text-align: center;
transition: all .3s cubic-bezier(.645, .045, .355, 1);
transform-origin: 100% 50%;
}
.el-icon-close:before{transform: scale(.6);
display: inline-block;
}
</style>
//ScrollPane.vue
<template>
<div class="scroll-container" ref="scrollContainer" @wheel.prevent="handleScroll">
<div class="scroll-wrapper" ref="scrollWrapper" :style="{left: left +'px'}">
<slot></slot>
</div>
</div>
</template>
<script>
const padding = 15 // tag's padding
export default {
name: 'scrollPane',
data() {
return {left: 10}
},
methods: {handleScroll(e) {
const eventDelta = e.wheelDelta || -e.deltaY * 3//wheelDelta:-120;deltaY:-120
const $container = this.$refs.scrollContainer// 里面的 container
const $containerWidth = $container.offsetWidth// 里面的 container 的宽度
const $wrapper = this.$refs.scrollWrapper// 外面
const $wrapperWidth = $wrapper.offsetWidth// 外面的宽度
if (eventDelta > 0) {this.left = Math.min(0, this.left + eventDelta)//min() 办法可返回指定的数字中带有最低值的数字。} else {if ($containerWidth - padding < $wrapperWidth) {if (this.left < -($wrapperWidth - $containerWidth + padding)) {this.left = this.left} else {this.left = Math.max(this.left + eventDelta, $containerWidth - $wrapperWidth - padding)
}
} else {this.left = 0}
}
},
moveToTarget($target) {
const $container = this.$refs.scrollContainer
const $containerWidth = $container.offsetWidth
const $targetLeft = $target.offsetLeft
const $targetWidth = $target.offsetWidth
if ($targetLeft < -this.left) {
// tag in the left
this.left = -$targetLeft + padding
} else if ($targetLeft + padding > -this.left && $targetLeft + $targetWidth < -this.left + $containerWidth - padding) {
// tag in the current view
// eslint-disable-line
} else {
// tag in the right
this.left = -($targetLeft - ($containerWidth - $targetWidth) + padding)
}
}
}
}
</script>
<style scoped>
.scroll-container {
white-space: nowrap;
position: relative;
overflow: hidden;
width: 100%;
}
.scroll-wrapper {
position: absolute;
top: 8px;
}
</style>
注意事项：
- 留神文件引入的门路;
- router.js 路由要加上 meta,name。