復(fù)制以下代碼就可使用
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import Vue from 'vue';
/*
* 使用方法
* 將以下代碼復(fù)制到一個(gè)js文件中，然后在入口文件main.js中import引入即可；
* 給elementUI的dialog上加上 v-dialogDrag 指令就可以實(shí)現(xiàn)彈窗的全屏和拉伸了。
* 給dialog設(shè)置 :close-on-click-modal="false" , 禁止點(diǎn)擊遮罩層關(guān)閉彈出層
* 如果是form表單，不要將提交等按鈕放置el-form-item，以免在上下拉伸時(shí)被隱藏
*/
// v-dialogDrag: 彈窗拖拽+水平方向伸縮
Vue.directive('dialogDrag', {
bind(el, binding, vnode, oldVnode) {
//彈框可拉伸最小寬高
let minWidth = 400;
let minHeight = 300;
//初始非全屏
let isFullScreen = false;
//當(dāng)前寬高
let nowWidth = 0;
let nowHight = 0;
//當(dāng)前頂部高度
let nowMarginTop = 0;
//獲取彈框頭部（這部分可雙擊全屏）
const dialogHeaderEl = el.querySelector('.el-dialog__header');
//彈窗
const dragDom = el.querySelector('.el-dialog');
//給彈窗加上overflow auto；不然縮小時(shí)框內(nèi)的標(biāo)簽可能超出dialog；
dragDom.style.overflow = "auto";
//清除選擇頭部文字效果
//dialogHeaderEl.onselectstart = new Function("return false");
//頭部加上可拖動(dòng)cursor
dialogHeaderEl.style.cursor = 'move';
// 獲取原有屬性 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) => {
// 鼠標(biāo)按下，計(jì)算當(dāng)前元素距離可視區(qū)的距離
const disX = e.clientX - dialogHeaderEl.offsetLeft;
const disY = e.clientY - dialogHeaderEl.offsetTop;
// 獲取到的值帶px 正則匹配替換
let styL, styT;
// 注意在ie中 第一次獲取到的值為組件自帶50% 移動(dòng)之后賦值為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) {
// 通過事件委托，計(jì)算移動(dòng)的距離
const l = e.clientX - disX;
const t = e.clientY - disY;
// 移動(dòng)當(dāng)前元素
dragDom.style.left = `${l + styL}px`;
dragDom.style.top = `${t + styT}px`;
//將此時(shí)的位置傳出去
//binding.value({x:e.pageX,y:e.pageY})
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
dialogHeaderEl.onmousedown = moveDown;
//雙擊頭部全屏效果
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;
}
}
dragDom.onmousemove = function (e) {
let moveE = e;
if (e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10 || dragDom.offsetLeft + 10 > e.clientX) {
dragDom.style.cursor = 'w-resize';
} else if (el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) {
dragDom.style.cursor = 's-resize';
} else {
dragDom.style.cursor = 'default';
dragDom.onmousedown = null;
}
dragDom.onmousedown = (e) => {
const clientX = e.clientX;
const clientY = e.clientY;
let elW = dragDom.clientWidth;
let elH = dragDom.clientHeight;
let EloffsetLeft = dragDom.offsetLeft;
let EloffsetTop = dragDom.offsetTop;
dragDom.style.userSelect = 'none';
let ELscrollTop = el.scrollTop;
//判斷點(diǎn)擊的位置是不是為頭部
if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) {
//如果是頭部在此就不做任何動(dòng)作，以上有綁定dialogHeaderEl.onmousedown = moveDown;
}else{
document.onmousemove = function (e) {
e.preventDefault(); // 移動(dòng)時(shí)禁用默認(rèn)事件
//左側(cè)鼠標(biāo)拖拽位置
if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {
//往左拖拽
if (clientX > e.clientX) {
dragDom.style.width = elW + (clientX - e.clientX) * 2 + 'px';
}
//往右拖拽
if (clientX < e.clientX) {
if(dragDom.clientWidth < minWidth){
}else{
dragDom.style.width = elW - (e.clientX - clientX) * 2 + 'px';
}
}
}
//右側(cè)鼠標(biāo)拖拽位置
if (clientX > EloffsetLeft + elW - 10 && clientX < EloffsetLeft + elW) {
//往左拖拽
if (clientX > e.clientX) {
if (dragDom.clientWidth < minWidth) {
} else {
dragDom.style.width = elW - (clientX - e.clientX) * 2 + 'px';
}
}
//往右拖拽
if (clientX < e.clientX) {
dragDom.style.width = elW + (e.clientX - clientX) * 2 + 'px';
}
}
//底部鼠標(biāo)拖拽位置
if (ELscrollTop + clientY > EloffsetTop + elH - 20 && ELscrollTop + clientY < EloffsetTop + elH) {
//往上拖拽
if (clientY > e.clientY) {
if (dragDom.clientHeight < minHeight) {
} else {
dragDom.style.height = elH - (clientY - e.clientY) * 2 + 'px';
}
}
//往下拖拽
if (clientY < e.clientY) {
dragDom.style.height = elH + (e.clientY - clientY) * 2 + 'px';
}
}
};
//拉伸結(jié)束
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
}
}
}
})
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