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图片叠加拖拽对比展示效果实现——Vue版

项目中遇见一个需求：2张图片按竖线分割，左右两侧分别展示对应图片，通过滚动条拖动对应展示图片区域；;
网上搜索了下，没有找到直接可用的组件，这里自己封装了一个次功能组件；后面会附上完整代码。，希望可以帮助到由此需求的小伙伴；

一、实现效果预览

二、HTML 部分

1. 组件包含：头部插槽、底部插槽、切换比较图片组

2. 代码示例

<template><div class="image-comparator"><!--  头部插槽  --><slot name="header"></slot><!--   切换对比图片  下一组、上一组 --><div class="prev" @click="prevFun"><i class="el-icon-arrow-left"></i></div><div class="next" @click="nextFun"><i class="el-icon-arrow-right"></i></div><!-- 核心标签代码   --><div class="container" @mouseenter="startDrag" @mousemove="onDrag" @mouseup="endDrag" @mouseleave="endDrag"><div class="image-wrapper":style="{ clipPath: `inset(0 ${100 - (dividerPosition / containerWidth * 100)}% 0 0)` }"><img src="https://fuss10.elemecdn.com/9/bb/e27858e973f5d7d3904835f46abbdjpeg.jpeg" class="image"/></div><div class="divider" :style="{ left: `${dividerPosition}px` }"></div><div class="image-wrapper" :style="{ clipPath: `inset(0 0 0 ${(dividerPosition / containerWidth * 100)}%)` }"><img src="https://fuss10.elemecdn.com/d/e6/c4d93a3805b3ce3f323f7974e6f78jpeg.jpeg" class="image"/></div></div><!--  底部插槽  --><slot name="footer"></slot></div>
</template>

三、JS 部分

1. 包含组件传参，左侧图片地址、右侧图片地址、事件处理等

2. JS 部分代码如下：

<script>export default {name: 'imageComparator',props: {leftImgUrl: {type: String,},rightImgUrl: {type: String,},},data() {return {containerWidth: 500,dividerPosition: 250,dragging: false,containerRect: null,};},methods: {updateContainerWidth() {this.containerWidth = this.$el.querySelector('.container').clientWidth;},startDrag(event) {this.dragging = true;this.containerRect = this.$el.querySelector('.container').getBoundingClientRect();},onDrag(event) {if (this.dragging && this.containerRect) {let newPosition = event.clientX - this.containerRect.left;if (newPosition < 0) newPosition = 0;if (newPosition > this.containerRect.width) newPosition = this.containerRect.width;this.dividerPosition = newPosition;}},endDrag() {this.dragging = false;this.containerRect = null;},prevFun() {this.$emit('prevFun');},nextFun() {this.$emit('nextFun');},},mounted() {this.updateContainerWidth();window.addEventListener('resize', this.updateContainerWidth);},beforeDestroy() {window.removeEventListener('resize', this.updateContainerWidth);},};</script>

四、 CSS 样式代码

<style scoped lang="less">
.image-comparator {width: 90%;/*max-width: 600px;*/margin: 0 auto;.container {position: relative;width: 100%;height: 600px;overflow: hidden;}.image-wrapper {position: absolute;top: 0;left: 0;width: 100%;height: 100%;overflow: hidden;}.image {width: 100%;height: 100%;object-fit: cover;}.divider {position: absolute;top: 0;bottom: 0;width: 2px;background-color: black;cursor: ew-resize;z-index: 10;}.prev, .next {position: absolute;top: 50%;transform: translateY(-50%);z-index: 100;cursor: pointer;font-size: 40px;color: white;background-color: rgba(0, 0, 0, 0.5);padding: 10px;border-radius: 50%;transition: all 0.3s ease;left: 10px;&:hover {background-color: rgba(0, 0, 0, 0.8);color: #0bf4cb;}&.next {right: 10px;left: auto;}}
}</style>

## 五、总结

本文着重介绍了Vue2 封装的图片分割展示组件，如果小伙伴项目是V3 可以自行修改Vue 组件即可，还有写组件传参地方，需要的话自行改为动态参数即可，这里父组件不做过多介绍，以免浪费小伙伴看代码时间；

六、完整使用示例

以下是一个完整的 代码示例

<template><div class="image-comparator"><!--  头部插槽  --><slot name="header"></slot><!--   切换对比图片  下一组、上一组 --><div class="prev" @click="prevFun"><i class="el-icon-arrow-left"></i></div><div class="next" @click="nextFun"><i class="el-icon-arrow-right"></i></div><!-- 核心标签代码   --><div class="container" @mouseenter="startDrag" @mousemove="onDrag" @mouseup="endDrag" @mouseleave="endDrag"><div class="image-wrapper":style="{ clipPath: `inset(0 ${100 - (dividerPosition / containerWidth * 100)}% 0 0)` }"><img src="https://fuss10.elemecdn.com/9/bb/e27858e973f5d7d3904835f46abbdjpeg.jpeg" class="image"/></div><div class="divider" :style="{ left: `${dividerPosition}px` }"></div><div class="image-wrapper" :style="{ clipPath: `inset(0 0 0 ${(dividerPosition / containerWidth * 100)}%)` }"><img src="https://fuss10.elemecdn.com/d/e6/c4d93a3805b3ce3f323f7974e6f78jpeg.jpeg" class="image"/></div></div><!--  底部插槽  --><slot name="footer"></slot></div>
</template><script>
export default {name: 'imageComparator',props: {leftImgUrl: {type: String,},rightImgUrl: {type: String,},},data() {return {containerWidth: 500,dividerPosition: 250,dragging: false,containerRect: null,};},methods: {updateContainerWidth() {this.containerWidth = this.$el.querySelector('.container').clientWidth;},startDrag(event) {this.dragging = true;this.containerRect = this.$el.querySelector('.container').getBoundingClientRect();},onDrag(event) {if (this.dragging && this.containerRect) {let newPosition = event.clientX - this.containerRect.left;if (newPosition < 0) newPosition = 0;if (newPosition > this.containerRect.width) newPosition = this.containerRect.width;this.dividerPosition = newPosition;}},endDrag() {this.dragging = false;this.containerRect = null;},prevFun() {this.$emit('prevFun');},nextFun() {this.$emit('nextFun');},},mounted() {this.updateContainerWidth();window.addEventListener('resize', this.updateContainerWidth);},beforeDestroy() {window.removeEventListener('resize', this.updateContainerWidth);},};
</script>
<style scoped lang="less">
.image-comparator {width: 90%;/*max-width: 600px;*/margin: 0 auto;.container {position: relative;width: 100%;height: 600px;overflow: hidden;}.image-wrapper {position: absolute;top: 0;left: 0;width: 100%;height: 100%;overflow: hidden;}.image {width: 100%;height: 100%;object-fit: cover;}.divider {position: absolute;top: 0;bottom: 0;width: 2px;background-color: black;cursor: ew-resize;z-index: 10;}.prev, .next {position: absolute;top: 50%;transform: translateY(-50%);z-index: 100;cursor: pointer;font-size: 40px;color: white;background-color: rgba(0, 0, 0, 0.5);padding: 10px;border-radius: 50%;transition: all 0.3s ease;left: 10px;&:hover {background-color: rgba(0, 0, 0, 0.8);color: #0bf4cb;}&.next {right: 10px;left: auto;}}
}</style>

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