vue图片放大缩小拖拽

1.封装可放大缩小拖拽组件
<template>
<div class="drag-outer"
ref="dragWrap"
:style="'width:'+imgWidth"
@mouseenter="isHover = true"
@mouseleave="isHover = isMousedown = false"
@mousemove="dragMousemove">
<div class="drag-inner"
ref="dragElement"
@mousedown="dragMousedown"
@mouseup.stop="isMousedown = false">
<slot></slot>
</div>
</div>
</template>

<script>
export default {
name: "index",
props: {
imgWidth: {
type:String,
default () {
return '400px'
}
},
scaleZoom: {
type: Object,
default () {
return {
max: 5,
min: 0.2
}
}
}
},
data() {
return {
isMousedown: false,
isHover: false,
moveStart: {},
translate: {x: 0, y: 0},
scale: 1
}
},
mounted() {
window.addEventListener('mousewheel',this.handleScroll,false)
},
methods: {
handleScroll(e) {
if (this.isHover) {
let speed = e.wheelDelta / 120
if (e.wheelDelta > 0 && this.scale < this.scaleZoom.max) {
this.scale += 0.2 * speed
this.$refs.dragElement.style.transform = `scale(${this.scale}) translate(${this.translate.x}px, ${this.translate.y}px)`
} else if (e.wheelDelta < 0 && this.scale > this.scaleZoom.min) {
this.scale += 0.2 * speed
this.$refs.dragElement.style.transform = `scale(${this.scale}) translate(${this.translate.x}px, ${this.translate.y}px)`
}
}
},
dragMousedown() {
this.moveStart.x = event.clientX
this.moveStart.y = event.clientY
this.isMousedown = true
},
dragMousemove() {
if (this.isMousedown) {
this.translate.x += (event.clientX - this.moveStart.x) / this.scale
this.translate.y += (event.clientY - this.moveStart.y) / this.scale
this.$refs.dragElement.style.transform = `scale(${this.scale}) translate(${this.translate.x}px, ${this.translate.y}px)`
this.moveStart.x = event.clientX
this.moveStart.y = event.clientY
}
}
}
}
</script>

<style lang="scss" scoped>
.drag-outer {
overflow: hidden;
height:500px; float: left;
display: flex;
background-color:#fff;
justify-content: center;
align-items: center;
.drag-inner {
transform-origin: center center;
display: flex;
justify-content: center;
align-items: center;
cursor: move;
user-select: none;
width:100%;
height:100%;
>* {
-webkit-user-drag: none;
user-drag: none;
}
img{object-fit:contain; width:100%; height:100%}
}
}
</style>

2.引用组件实现效果
<template>
<div>
<inc_imgsvg v-if="srcImg" :imgWidth="'100%'">
<img :src="srcImg" alt="">
</inc_imgsvg>
</div>
</template>

<script>
import inc_imgsvg from "@/components/customImg/index";
export default {
name: "index",
components: {inc_imgsvg},
data(){
return{
srcImg:'https://xxx.png'
}
}
}
</script>
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原文链接：https://blog.csdn.net/weixin_46054723/article/details/129261541