vue3封装放大镜组件的实例代码
程序员文章站
2022-07-10 13:48:49
目录组件基础结构结尾有完整代码可直接复制使用目的:封装图片预览组件,实现鼠标悬停切换效果落地代码:
组件基础结构
功能实现
完整代码
...
组件基础结构
结尾有完整代码可直接复制使用
目的:封装图片预览组件,实现鼠标悬停切换效果
落地代码:
<template> <div class="goods-image"> <div class="middle"> <img :src="images[currindex]" alt=""> </div> <ul class="small"> <li v-for="(img,i) in images" :key="img" :class="{active:i===currindex}"> <img @mouseenter="currindex=i" :src="img" alt=""> </li> </ul> </div> </template> <script> import { ref } from 'vue' export default { name: 'goodsimage', props: { images: { type: array, default: () => [] } }, setup (props) { const currindex = ref(0) return { currindex } } } </script> <style scoped lang="less"> .goods-image { width: 480px; height: 400px; position: relative; display: flex; .middle { width: 400px; height: 400px; background: #f5f5f5; } .small { width: 80px; li { width: 68px; height: 68px; margin-left: 12px; margin-bottom: 15px; cursor: pointer; &:hover,&.active { border: 2px solid @xtxcolor; } } } } </style>
图片放大镜
目的:实现图片放大镜功能
步骤:
- 首先准备大图容器和遮罩容器
- 然后使用@vueuse/core的usemouseinelement方法获取基于元素的偏移量
- 计算出 遮罩容器定位与大容器背景定位 暴露出数据给模板使用
落地代码:
<template> <div class="goods-image"> + // 实现右侧大图布局效果(背景图放大4倍) + <div class="large" :style="[{backgroundimage:`url(${images[currindex]})`}]"></div> <div class="middle"> <img :src="images[currindex]" alt=""> + // 准备待移动的遮罩容器 + <div class="layer"></div> </div> <ul class="small"> <li v-for="(img,i) in images" :key="img" :class="{active:i===currindex}"> <img @mouseenter="currindex=i" :src="img" alt=""> </li> </ul> </div> </template> <script> import { ref } from 'vue' export default { name: 'goodsimage', props: { images: { type: array, default: () => [] } }, setup (props) { const currindex = ref(0) return { currindex } } } </script> <style scoped lang="less"> .goods-image { width: 480px; height: 400px; position: relative; display: flex; + z-index: 500; + // 右侧大图样式 + .large { + position: absolute; + top: 0; + left: 412px; + width: 400px; + height: 400px; + box-shadow: 0 0 10px rgba(0,0,0,0.1); + background-repeat: no-repeat; + background-size: 800px 800px; + background-color: #f8f8f8; + } .middle { width: 400px; height: 400px; background: #f5f5f5; + position: relative; + cursor: move; + // 遮罩样式 + .layer { + width: 200px; + height: 200px; + background: rgba(0,0,0,.2); + left: 0; + top: 0; + position: absolute; + } } .small { width: 80px; li { width: 68px; height: 68px; margin-left: 12px; margin-bottom: 15px; cursor: pointer; &:hover,&.active { border: 2px solid @xtxcolor; } } } } </style>
安装vueuse
npm i @vueuse/core@5.3.0
目前5.3.0版本相对稳定
vueuse提供的监听进入指定范围方法的基本使用
import { usemouseinelement } from '@vueuse/core' const { elementx, elementy, isoutside } = usemouseinelement(target)
方法的参数target表示被监听的dom对象;返回值elementx, elementy表示被监听的dom的左上角的位置信息left和top;isoutside表示是否在dom的范围内,true表示在范围之外。false表示范围内。
功能实现
<div v-if="isshow" class="large" :style="[{ backgroundimage: `url(${images[currindex]})` }, bgposition]"></div> <div class="middle" ref="target"> <img :src="images[currindex]" alt="" /> <div class="layer" v-if="isshow" :style="[position]"></div> </div> setup () { // 被监听的区域 const target = ref(null) // 控制遮罩层和预览图的显示和隐藏 const isshow = ref(false) // 定义遮罩的坐标 const position = reactive({ left: 0, top: 0 }) // 右侧预览大图的坐标 const bgposition = reactive({ backgroundpositionx: 0, backgroundpositiony: 0 }) return { position, bgposition, target, isshow } }
const { elementx, elementy, isoutside } = usemouseinelement(target) // 基于侦听器侦听值的变化 watch([elementx, elementy, isoutside], () => { // 通过标志位控制显示和隐藏 isshow.value = !isoutside.value if (isoutside.value) return // x方向坐标范围控制 if (elementx.value < 100) { // 左侧 position.left = 0 } else if (elementx.value > 300) { // 右侧 position.left = 200 } else { // 中间 position.left = elementx.value - 100 } // y方向坐标范围控制 if (elementy.value < 100) { position.top = 0 } else if (elementy.value > 300) { position.top = 200 } else { position.top = elementy.value - 100 } // 计算预览大图的移动的距离 bgposition.backgroundpositionx = -position.left * 2 + 'px' bgposition.backgroundpositiony = -position.top * 2 + 'px' // 计算遮罩层的位置 position.left = position.left + 'px' position.top = position.top + 'px' })
完整代码
<template> <div class="goods-image"> <div v-if="isshow" class="large" :style="[{ backgroundimage: `url(${images[currindex]})` }, bgposition]"></div> <div class="middle" ref="target"> <img :src="images[currindex]" alt="" /> <div class="layer" v-if="isshow" :style="[position]"></div> </div> <ul class="small"> <li v-for="(img, i) in images" :key="img" :class="{ active: i === currindex }"> <img @mouseenter="currindex = i" :src="img" alt="" /> </li> </ul> </div> </template> <script> import { ref, watch, reactive } from 'vue' import { usemouseinelement } from '@vueuse/core' export default { name: 'goodsimage', props: { images: { type: array, default: () => [] } }, setup (props) { const currindex = ref(0) const target = ref(null) const isshow = ref(false) const position = reactive({ left: 0, top: 0 }) const bgposition = reactive({ backgroundpositionx: 0, backgroundpositiony: 0 }) const { elementx, elementy, isoutside } = usemouseinelement(target) watch([elementx, elementy, isoutside], () => { isshow.value = !isoutside.value if (isoutside.value) return if (elementx.value <= 100) { position.left = 0 } else if (elementx.value >= 300) { position.left = 200 } else { position.left = elementx.value - 100 } if (elementy.value <= 100) { position.top = 0 } else if (elementy.value >= 300) { position.top = 200 } else { position.top = elementy.value - 100 } bgposition.backgroundpositionx = -position.left * 2 + 'px' bgposition.backgroundpositiony = -position.top * 2 + 'px' position.left += 'px' position.top += 'px' }) return { currindex, target, isshow, position, bgposition } } } </script> <style scoped lang="less"> .goods-image { width: 480px; height: 400px; position: relative; display: flex; z-index: 500; .large { position: absolute; top: 0; left: 412px; width: 400px; height: 400px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); background-repeat: no-repeat; background-size: 800px 800px; background-color: #f8f8f8; } .middle { width: 400px; height: 400px; background: #f5f5f5; position: relative; cursor: move; .layer { width: 200px; height: 200px; background: rgba(0,0,0,.2); left: 0; top: 0; position: absolute; } } .small { width: 80px; li { width: 68px; height: 68px; margin-left: 12px; margin-bottom: 15px; cursor: pointer; &:hover, &.active { border: 2px solid @xtxcolor; } } } } </style>
总结
到此这篇关于vue3封装放大镜组件的文章就介绍到这了,更多相关vue3封装放大镜组件内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持!