Vue多布局模式实现方法详细讲解
目录
- 1、目标效果
- 2、原理分析
1、目标效果
源码地址:multipal-layout-demo: vue2实现多布局+暗黑模式
默认布局:头部宽度100%,侧边栏、内容区
顶部布局:头部宽度100%,内容区
侧边栏布局:侧边栏高度100%,头部、内容区
2、原理分析
(1)vuex文件
import Vue from "vue"import Vuex from "vuex"Vue.use(Vuex)export default new Vuex.Store({ state: { // 暗黑模式 isDark: false, // 布局类型 layoutType: "default" }, mutations: { // 修改暗黑模式 set_is_dark(state, val) { state.isDark = val }, // 修改布局类型 set_layout_type(state, val) { state.layoutType = val } }, actions: { }, modules: { }})
(2)布局缩略图如何实现?用div + css 手动实现布局样式
父组件传递一个布局类型数组,遍历此组件;用一个变量保存索引值,点击不同的布局类型项时切换索引并在vuex修改当前选中的布局类型
将缩略图封装成组件:Thumbnail.vue
<template> <!-- 缩略图 --> <div><div v-for="(item, index) in layouts" @click="changeCheck(item, index)"> <template v-if="item.type == "default""><div :style="{ background: isDark ? "black" : "#fff" }"></div><div :style="{ background: isDark ? "black" : "#fff" }"></div> </template> <template v-if="item.type == "top""><div :style="{ background: isDark ? "black" : "#fff" }"></div> </template> <template v-if="item.type == "slide""><div></div><div :style="{ background: isDark ? "black" : "#fff" }"></div> </template> <i v-show="checked == index"></i></div> </div></template><script>import { mapState } from "vuex"export default { props: {// 布局类型数组layouts: { type: Array, default: () => []} }, data() {return { // 当前选中值 checked: 0,} }, computed: {// 获取是否是暗黑模式,从而缩略图实现暗黑效果...mapState(["isDark"]) }, methods: {// 切换选中值changeCheck(item, index) { this.checked = index this.$store.commit("set_layout_type", item.type)} }}</script><style lang="less" scoped>.thumbnail { display: flex; width: 100%; .layout {position: relative;width: 50px;height: 50px;border: 1px solid gray;overflow: hidden;background: #f0f0f0;border-radius: 5px;cursor: pointer;.top { position: absolute; left: 0; top: 0; width: 100%; height: 25%;}.left { position: absolute; left: 0; top: 0; bottom: 0; width: 25%; height: 100%;}.el-icon-check { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); font-size: 20px;} }}</style>
(3)建立多个不同类型的布局文件:
侧边栏布局 :src/views/layout/SlideLayout.vue
<template> <!-- 侧边栏布局 --> <div> <Sliderbar></Sliderbar> <Header></Header> <div> <router-view /> </div> </div></template><script>import Sliderbar from "@/components/Sliderbar.vue"import Header from "@/components/Header.vue"export default { components: { Header, Sliderbar, },}</script><style lang="less" scoped></style>
默认布局布局:src/views/layout/DefaultLayout.vue
<template> <!-- 默认布局 --> <div> <Header></Header> <Sliderbar></Sliderbar> <div> <router-view /> </div> </div></template><script>import Header from "@/components/Header.vue"import Sliderbar from "@/components/Sliderbar.vue"export default { components: { Header, Sliderbar },}</script><style lang="less" scoped></style>
顶部布局:src/views/layout/TopLayout.vue
<template> <!-- 顶栏布局 --> <div> <Header></Header> <div> <router-view /> </div> </div></template><script>import Header from "@/components/Header.vue"export default { components: { Header, },}</script><style lang="less" scoped></style>
(4)首页组件 Home.vue,Home.vue下面渲染二级路由
<template> <!-- vuex获取选中的布局类型 --> <div><defaultLayout v-show="layoutType == "default""></defaultLayout><slideLayout v-show="layoutType == "slide""></slideLayout><topLayout v-show="layoutType == "top""></topLayout> </div></template><script>import defaultLayout from "./layout/DefaultLayout.vue"import slideLayout from "./layout/SlideLayout.vue"import topLayout from "./layout/TopLayout.vue"import { mapState } from "vuex"export default { components: { defaultLayout, slideLayout, topLayout }, computed: {...mapState(["layoutType"]) },}</script><style lang="less" scoped></style>
(5)暗黑模式、布局类型变量都是保存在vuex中,因为多个组件之间进行数据通信比较方便!通过mapState取出vuex数据,然后通过computed接受mapState值,但如果想要直接修改mapState中的值则会报以下的错误:
computed property "isDark" was assigned to but it has no setter.
这是因为computed为只读的。不能直接修改computed的数据,要想修改则使用set
computed: { ...mapState(["isDark"]), // computed property "isDark" was assigned to but it has no setter. 这是因为computed为只读的。不能直接修改computed的数据,要想修改则使用set darkMode: { get() {return this.isDark }, set(val) {this.$store.commit("set_is_dark", val)// 获取html根元素标签let html = document.documentElementif (val) { // html添加class="dark"选择器 html.classList.add("dark")} else { // html移除class="dark"选择器 html.classList.remove("dark")} } } },
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