# 点击波纹
# 一、效果图
# 二、使用方式
el-dialog 元素使用 v-el-drag-dialog 指令
<el-dialog
v-el-drag-dialog
:custom-class="className"
:width="`${width}px`"
:fullscreen="fullscreen"
top="10vh"
:visible.sync="dialogVisible"
:title="title"
>
<slot />
<template slot="footer">
<slot name="footer" class="dialog-footer" />
</template>
</el-dialog>
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# 三、代码
export default {
bind(el, binding, vnode) {
const dialogHeaderEl = el.querySelector(".el-dialog__header");
const dragDom = el.querySelector(".el-dialog");
dialogHeaderEl.style.cssText += ";cursor:move;";
dragDom.style.cssText += ";top:0px;";
// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
const getStyle = (function () {
if (window.document.currentStyle) {
return (dom, attr) => dom.currentStyle[attr];
} else {
return (dom, attr) => getComputedStyle(dom, false)[attr];
}
})();
dialogHeaderEl.onmousedown = (e) => {
// 鼠标按下,计算当前元素距离可视区的距离
const disX = e.clientX - dialogHeaderEl.offsetLeft;
const disY = e.clientY - dialogHeaderEl.offsetTop;
const dragDomWidth = dragDom.offsetWidth;
const dragDomHeight = dragDom.offsetHeight;
const screenWidth = document.body.clientWidth;
const screenHeight = document.body.clientHeight;
const minDragDomLeft = dragDom.offsetLeft;
const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
const minDragDomTop = dragDom.offsetTop;
const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomHeight;
// 获取到的值带px 正则匹配替换
let styL = getStyle(dragDom, "left");
let styT = getStyle(dragDom, "top");
if (styL.includes("%")) {
styL = +document.body.clientWidth * (+styL.replace(/\%/g, "") / 100);
styT = +document.body.clientHeight * (+styT.replace(/\%/g, "") / 100);
} else {
styL = +styL.replace(/\px/g, "");
styT = +styT.replace(/\px/g, "");
}
document.onmousemove = function (e) {
// 通过事件委托,计算移动的距离
let left = e.clientX - disX;
let top = e.clientY - disY;
// 边界处理
if (-left > minDragDomLeft) {
left = -minDragDomLeft;
} else if (left > maxDragDomLeft) {
left = maxDragDomLeft;
}
if (-top > minDragDomTop) {
top = -minDragDomTop;
} else if (top > maxDragDomTop) {
top = maxDragDomTop;
}
// 移动当前元素
dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`;
// emit onDrag event
vnode.child.$emit("dragDialog");
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
};
},
};
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← 点击波纹