这篇文章将为大家详细讲解有关vue3如何封装放大镜组件,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
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
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" :></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>
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。
<div v-if="isShow" class="large" :></div> <div class="middle" ref="target"> <img :src="images[currIndex]" alt="" /> <div class="layer" v-if="isShow" :></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' })
<template> <div class="goods-image"> <div v-if="isShow" class="large" :></div> <div class="middle" ref="target"> <img :src="images[currIndex]" alt="" /> <div class="layer" v-if="isShow" :></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>
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