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這篇文章將為大家詳細講解有關vue3如何封裝放大鏡組件,小編覺得挺實用的,因此分享給大家做個參考,希望大家閱讀完這篇文章后可以有所收獲。
結尾有完整代碼可直接復制使用
目的:封裝圖片預覽組件,實現鼠標懸停切換效果
落地代碼:
<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>
圖片放大鏡
步驟:
首先準備大圖容器和遮罩容器
然后使用@vueuse/core的useMouseInElement方法獲取基于元素的偏移量
計算出 遮罩容器定位與大容器背景定位 暴露出數據給模板使用
落地代碼:
<template> <div class="goods-image"> + // 實現右側大圖布局效果(背景圖放大4倍) + <div class="large" :></div> <div class="middle"> <img :src="images[currIndex]" alt=""> + // 準備待移動的遮罩容器 + <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; + // 右側大圖樣式 + .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; + // 遮罩樣式 + .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版本相對穩定
vueuse提供的監聽進入指定范圍方法的基本使用
import { useMouseInElement } from '@vueuse/core' const { elementX, elementY, isOutside } = useMouseInElement(target)
方法的參數target表示被監聽的DOM對象;返回值elementX, elementY表示被監聽的DOM的左上角的位置信息left和top;isOutside表示是否在DOM的范圍內,true表示在范圍之外。false表示范圍內。
<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 () { // 被監聽的區域 const target = ref(null) // 控制遮罩層和預覽圖的顯示和隱藏 const isShow = ref(false) // 定義遮罩的坐標 const position = reactive({ left: 0, top: 0 }) // 右側預覽大圖的坐標 const bgPosition = reactive({ backgroundPositionX: 0, backgroundPositionY: 0 }) return { position, bgPosition, target, isShow } }
const { elementX, elementY, isOutside } = useMouseInElement(target) // 基于偵聽器偵聽值的變化 watch([elementX, elementY, isOutside], () => { // 通過標志位控制顯示和隱藏 isShow.value = !isOutside.value if (isOutside.value) return // X方向坐標范圍控制 if (elementX.value < 100) { // 左側 position.left = 0 } else if (elementX.value > 300) { // 右側 position.left = 200 } else { // 中間 position.left = elementX.value - 100 } // Y方向坐標范圍控制 if (elementY.value < 100) { position.top = 0 } else if (elementY.value > 300) { position.top = 200 } else { position.top = elementY.value - 100 } // 計算預覽大圖的移動的距離 bgPosition.backgroundPositionX = -position.left * 2 + 'px' bgPosition.backgroundPositionY = -position.top * 2 + 'px' // 計算遮罩層的位置 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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