import Vue from 'vue';
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// v-dialogDrag: 弹窗拖拽属性
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Vue.directive('dialogDrag', {
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bind(el, binding, vnode, oldVnode) {
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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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dialogHeaderEl.style.cssText += ';cursor:move;';
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dragDom.style.cssText += ';top:0px;';
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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 = (function() {
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if (window.document.currentStyle) {
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return (dom, attr) => dom.currentStyle[attr];
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} else {
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return (dom, attr) => getComputedStyle(dom, false)[attr];
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}
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})();
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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
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const disX = e.clientX - dialogHeaderEl.offsetLeft;
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const disY = e.clientY - dialogHeaderEl.offsetTop;
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const screenWidth = document.body.clientWidth; // body当前宽度
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const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)
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const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
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const dragDomheight = dragDom.offsetHeight; // 对话框高度
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const minDragDomLeft = dragDom.offsetLeft;
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const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
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const minDragDomTop = dragDom.offsetTop;
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const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight;
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// 获取到的值带px 正则匹配替换
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let styL = sty(dragDom, 'left');
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let styT = sty(dragDom, 'top');
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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 (styL.includes('%')) {
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// eslint-disable-next-line no-useless-escape
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styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100);
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// eslint-disable-next-line no-useless-escape
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styT = +document.body.clientHeight * (+styT.replace(/\%/g, '') / 100);
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} else {
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styL = +styL.replace(/\px/g, '');
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styT = +styT.replace(/\px/g, '');
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}
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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
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let left = e.clientX - disX;
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let top = e.clientY - disY;
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// 边界处理
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if (-left > minDragDomLeft) {
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left = -minDragDomLeft;
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} else if (left > maxDragDomLeft) {
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left = maxDragDomLeft;
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}
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if (-top > minDragDomTop) {
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top = -minDragDomTop;
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} else if (top > maxDragDomTop) {
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top = maxDragDomTop;
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}
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// 移动当前元素
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dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}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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return false;
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};
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}
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});
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