/**
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* v-dialogDrag 弹窗拖拽
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* Copyright (c) 2019 jcdm
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*/
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export default {
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bind(el, binding, vnode, oldVnode) {
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const value = binding.value
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if (value == false) return
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// 获取拖拽内容头部
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const dialogHeaderEl = el.querySelector('.el-dialog__header');
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const dragDom = el.querySelector('.el-dialog');
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dialogHeaderEl.style.cursor = 'move';
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// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
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const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);
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dragDom.style.position = 'absolute';
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dragDom.style.marginTop = 0;
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let width = dragDom.style.width;
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if (width.includes('%')) {
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width = +document.body.clientWidth * (+width.replace(/\%/g, '') / 100);
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} else {
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width = +width.replace(/\px/g, '');
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}
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dragDom.style.left = `${(document.body.clientWidth - width) / 2}px`;
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// 鼠标按下事件
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dialogHeaderEl.onmousedown = (e) => {
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// 鼠标按下，计算当前元素距离可视区的距离 (鼠标点击位置距离可视窗口的距离)
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const disX = e.clientX - dialogHeaderEl.offsetLeft;
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const disY = e.clientY - dialogHeaderEl.offsetTop;
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// 获取到的值带px 正则匹配替换
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let styL, styT;
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// 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
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if (sty.left.includes('%')) {
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styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100);
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styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100);
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} else {
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styL = +sty.left.replace(/\px/g, '');
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styT = +sty.top.replace(/\px/g, '');
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};
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// 鼠标拖拽事件
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document.onmousemove = function (e) {
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// 通过事件委托，计算移动的距离 （开始拖拽至结束拖拽的距离）
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const l = e.clientX - disX;
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const t = e.clientY - disY;
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let finallyL = l + styL
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let finallyT = t + styT
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// 移动当前元素
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dragDom.style.left = `${finallyL}px`;
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dragDom.style.top = `${finallyT}px`;
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};
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document.onmouseup = function (e) {
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document.onmousemove = null;
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document.onmouseup = null;
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};
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}
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}
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};
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