在directive文件夹下新建el-drag-dialog.js文件
export default {
bind(el, binding, vnode, oldVnode) {
let resizeEvent = new CustomEvent('drag-resize',{detail:'尺寸变化',bubbles:false});
//初始化不最大化
el.fullscreen = false;
//弹框可拉伸最小宽高
let minWidth = 400;
let minHeight = 300;
//当前宽高
let nowWidth = minWidth;
let nowHight = minHeight;
//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');
let hasSetBodyHight = false;
//弹窗
const dragDom = el.querySelector('.el-dialog');
dragDom.className += ' el-drag-dialog';
//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);
//头部插入最大化最小化元素
let maxMin = document.createElement("button");
maxMin.className += ' el-dialog__headerbtn el-dialog__minmax';
maxMin.style.right = '40px';
maxMin.style.color = '#909399';
maxMin.title = el.fullscreen ? '还原' : '最大化';
maxMin.innerHTML = '<i class=' + (el.fullscreen ? '"el-icon-crop"' : '"el-icon-full-screen"') + ' onMouseOver="this.style.color=\'#409EFF\'" onMouseOut="this.style.color=\'inherit\'"></i>';
dialogHeaderEl.insertBefore(maxMin, dialogHeaderEl.childNodes[1]);
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;
let bodyHeight = 'auto';
function setMaxMin() {
if (el.fullscreen) {
let i = maxMin.querySelector('.el-icon-crop');
i.classList.remove('el-icon-crop');
i.classList.add('el-icon-full-screen');
maxMin.innerHTML = '<i class="el-icon-full-screen"></i>';
maxMin.title = '最大化';
dragDom.style.height = "auto";
dragDom.style.width = nowWidth + 'px';
dragDom.style.marginTop = nowMarginTop;
el.fullscreen = false;
dialogHeaderEl.style.cursor = 'move';
dialogHeaderEl.onmousedown = moveDown;
dragDom.querySelector('.el-dialog__body').style.height = bodyHeight;
hasSetBodyHight = false;
} else {
let i = maxMin.querySelector('.el-icon-full-screen');
i.classList.remove('el-icon-full-screen');
i.classList.add('el-icon-crop');
maxMin.title = '还原';
bodyHeight = dragDom.querySelector('.el-dialog__body').offsetHeight + 'px';
nowHight = dragDom.clientHeight;
nowWidth = dragDom.clientWidth;
nowMarginTop = dragDom.style.marginTop;
dragDom.style.left = 0;
dragDom.style.top = 0;
dragDom.style.height = "90VH";
dragDom.style.width = "100VW";
dragDom.style.marginTop = 0;
el.fullscreen = true;
dialogHeaderEl.style.cursor = 'initial';
dialogHeaderEl.onmousedown = null;
if (!hasSetBodyHight) {
let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight;
dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)';
hasSetBodyHight = true;
}
}
el.dispatchEvent(resizeEvent);
}
//点击放大缩小效果
maxMin.onclick = setMaxMin;
//双击头部效果
dialogHeaderEl.ondblclick = setMaxMin;
dragDom.onmousemove = function (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;
//判断点击的位置是不是为头部
if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) {
//如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown;
} else {
document.onmousemove = function (e) {
e.preventDefault(); // 移动时禁用默认事件
//左侧鼠标拖拽位置
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';
}
}
}
//右侧鼠标拖拽位置
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';
}
}
//底部鼠标拖拽位置
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';
}
}
};
//拉伸结束
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
el.dispatchEvent(resizeEvent);
};
}
}
}
}
}
在main.js文件中导入上面的指令文件
import elDragDialog from '@/directive/permission/el-drag-dialog'
Vue.directive('el-drag-dialog', elDragDialog);
//弹窗默认点击遮罩改为不关闭 为了防止和拖拽冲突,这句需要放在use ElementUI之前
ElementUI.Dialog.props.closeOnClickModal.default = false;
在组件中使用
<el-dialog title="导入" width="1000px" :visible.sync="open" append-to-body v-el-drag-dialog @close="close"></el-dialog>
最后效果实现了拖拽拉伸,窗口加上最大化还原
