Vue 实现鼠标滚轮缩放图片并拖动

野性酷女 2023-09-24 13:16 65阅读 0赞

需求：实现鼠标滚轮上滚下滚缩放图片，单击不松开拖动图片

给图片添加一个盒子

// dom
    <div @mousewheel.prevent="rollImg" class="box">
         <img :src="src" class="img" ref="imgDiv" @mousedown="move" />
    </div>

methods中的代码：

// script
     // 拖动图片
    move(e) {
        // 阻止默认事件
        e.preventDefault();
        // 获取元素
        var boxDom = document.querySelector(".box");
        var img = document.querySelector(".img");
        var x = e.pageX - img.offsetLeft;
        var y = e.pageY - img.offsetTop;
        // 鼠标移动事件
        boxDom.addEventListener("mousemove", move);
        function move(e) {
            img.style.left = e.pageX - x + "px";
            img.style.top = e.pageY - y + "px";
        }
        // 鼠标抬起移除事件
        img.addEventListener("mouseup", function () {
             boxDom.removeEventListener("mousemove", move);
        });
        // 鼠标离开移除事件
        boxDom.addEventListener("mouseout", function () {
              boxDom.removeEventListener("mousemove", move);
        });
    },
    // 缩放图片
    rollImg(e) {
         let transform = this.$refs.imgDiv.style.transform
         let zoom = transform.indexOf("scale") != -1 ? +transform.split("(")[1].split(")")[0] : 1
         zoom += e.wheelDelta / 1200
         if (zoom > 0.1 && zoom < 5) {
               this.$refs.imgDiv.style.transform = "scale(" + zoom + ")"
         }
    },

CSS样式：

// css
    .box {
        position: relative;
        width: 100%;
        height: 360px;
        background-color: rgb(147, 145, 145);
        // 添加背景图片
        background-image: url(../../../assets/img/bg.png);
        background-position: 0 0;
        float: left;
        overflow: hidden;
    }
    
    .img {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        max-width: 923px;
        max-height: 460px;
        cursor: move;
    }

效果：

![f24edaabe5c64626b619c312c8200323.png][]

![6038dcb9e60a469797b8adf7e2bce71d.png][]

![dffef64ce15249bd88d1f598076319d9.png][]

[f24edaabe5c64626b619c312c8200323.png]: https://img-blog.csdnimg.cn/f24edaabe5c64626b619c312c8200323.png
[6038dcb9e60a469797b8adf7e2bce71d.png]: https://img-blog.csdnimg.cn/6038dcb9e60a469797b8adf7e2bce71d.png
[dffef64ce15249bd88d1f598076319d9.png]: https://img-blog.csdnimg.cn/dffef64ce15249bd88d1f598076319d9.png