Vue.directive("el-dialog-drag", {
bind: (el, binding) => {
//弹框可拉伸最小宽高
let minWidth = 400;
let minHeight = 300;
//初始非全屏
let isFullScreen = false;
//当前宽高
let nowWidth = 0;
let nowHight = 0;
//当前顶部高度
let nowMarginTop = 0;
//获取弹框头部（这部分可双击全屏）
const dialogHeaderEl = el.querySelector(".el-dialog__header");
//弹窗
const dragDom = el.querySelector(".el-dialog");
//给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；
dragDom.style.overflow = "auto";
//清除选择头部文字效果
dialogHeaderEl.onselectstart = new Function(" return false");
//头部加上可拖动cursor
dialogHeaderEl.style.cursor = "move";
// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);
let moveDown = 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;
// 获取到的值带px 正则匹配替换
let styL, styT;
// 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
if (sty.left.includes(" % ")) {
styL = +document.body.clientWidth * (+sty.left.replace(/%/g, "") / 100);
styT = +document.body.clientHeight * (+sty.top.replace(/%/g, "") / 100);
} else {
styL = +sty.left.replace(/\px/g, "");
styT = +sty.top.replace(/\px/g, "");
}
document.onmousemove = function(e) {
// 通过事件委托，计算移动的距离
const l = e.clientX - disX;
const t = e.clientY - disY;
// 移动当前元素
dragDom.style.left = ${l + styL}px;
dragDom.style.top = ${t + styT}px;
//将此时的位置传出去
//binding.value({x:e.pageX,y:e.pageY})
};
document.onmouseup = function(e) {
document.onmousemove = null;
document.onmouseup = null;
};
};
dialogHeaderEl.onmousedown = moveDown;
// //双击头部效果
// dialogHeaderEl.ondblclick = (e) => {
// if (isFullScreen == false) {
// nowHight = dragDom.clientHeight;
// nowWidth = dragDom.clientWidth;
// nowMarginTop = dragDom.style.marginTop;
// dragDom.style.left = 0;
// dragDom.style.top = 0;
// dragDom.style.height = '100VH';
// dragDom.style.width = '100VW';
// dragDom.style.marginTop = 0;
// isFullScreen = true;
// dialogHeaderEl.style.cursor = 'initial';
// dialogHeaderEl.onmousedown = null;
// } else {
// dragDom.style.height = 'auto';
// dragDom.style.width = nowWidth + 'px';
// dragDom.style.marginTop = nowMarginTop;
// isFullScreen = false;
// dialogHeaderEl.style.cursor = 'move';
// dialogHeaderEl.onmousedown = moveDown;
// }
// }
//拉伸
let resizeEl = document.createElement("div");
dragDom.appendChild(resizeEl);
//在弹窗右下角加上一个10-10px的控制块
resizeEl.style.cursor = "se-resize";
resizeEl.style.position = "absolute";
resizeEl.style.height = "10px";
resizeEl.style.width = "10px";
resizeEl.style.right = "0px";
resizeEl.style.bottom = "0px";
//鼠标拉伸弹窗
resizeEl.onmousedown = e => {
// 记录初始x位置
const clientX = e.clientX;
// 鼠标按下，计算当前元素距离可视区的距离
const disX = e.clientX - resizeEl.offsetLeft;
const disY = e.clientY - resizeEl.offsetTop;
document.onmousemove = function(e) {
e.preventDefault(); // 移动时禁用默认事件
// 通过事件委托，计算移动的距离
const x = e.clientX - disX + (e.clientX - clientX); //这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
const y = e.clientY - disY;
//比较是否小于最小宽高
dragDom.style.width = x > minWidth ? ${x}px : minWidth + "px";
dragDom.style.height = y > minHeight ? ${y}px : minHeight + "px";
};
//拉伸结束
document.onmouseup = function(e) {
document.onmousemove = null;
document.onmouseup = null;
};
};
}
});
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