本方式采用自定义指令实现
由于
- Vue3支持组件有多个根元素，当在组件上使用自定义指令时，它会始终应用于组件的根节点，和透传attributes类似
- el-dialog组件拥有多个根元素
因此不能直接将自定义指令直接绑定在el-dialog上，所以我们需要在el-dialog外层额外套一个盒子，并在此运用自定义指令
代码如下
<template>
<div class='dialogContainer' v-show="dialogVisible" v-resizer>
<el-dialog>...</el-dialog>
</div>
</template>
<script setup lang='ts'>
import {ref} from "vue"
const dialogVisible = ref(false);
const vResizer = {
updated: (el: any) => {
//弹框可拉伸最小宽高
let minWidth = 1000;
let minHeight = 300;
//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: any) => {
// 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 = 0;
let styT = 0;
// 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
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;
//拉伸(右下方)
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';
resizeEl.style.zIndex = '99';
//鼠标拉伸弹窗
resizeEl.onmousedown = (e) => {
// 记录初始x位置
let clientX = e.clientX;
// 鼠标按下，计算当前元素距离可视区的距离
let disX = e.clientX - resizeEl.offsetLeft;
let 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
let x = e.clientX - disX + (e.clientX - clientX);
let 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';
changeContentSize(dragDom)
};
//拉伸结束
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
//拉伸(左下方)
let resizeLB = document.createElement("div");
dragDom.appendChild(resizeLB);
//在弹窗右下角加上一个10-10px的控制块
resizeLB.style.cursor = 'nesw-resize';
resizeLB.style.position = 'absolute';
resizeLB.style.height = '10px';
resizeLB.style.width = '10px';
resizeLB.style.left = '0px';
resizeLB.style.bottom = '0px';
resizeLB.style.zIndex = '99';
//鼠标拉伸弹窗
resizeLB.onmousedown = (e) => {
// 记录初始x位置
let clientX = e.clientX;
// 鼠标按下，计算当前元素距离可视区的距离
let disX = e.clientX - resizeLB.offsetLeft;
let disY = e.clientY - resizeLB.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
let x = minWidth + clientX - e.clientX + disX - e.clientX;
let 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';
changeContentSize(dragDom)
};
//拉伸结束
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
//拉伸(右边)
let resizeElR = document.createElement("div");
dragDom.appendChild(resizeElR);
//在弹窗右下角加上一个10-10px的控制块
resizeElR.style.cursor = 'w-resize';
resizeElR.style.position = 'absolute';
resizeElR.style.height = '100%';
resizeElR.style.width = '10px';
resizeElR.style.right = '0px';
resizeElR.style.top = '0px';
//鼠标拉伸弹窗
resizeElR.onmousedown = (e) => {
let elW = dragDom.clientWidth;
let EloffsetLeft = dragDom.offsetLeft;
// 记录初始x位置
let clientX = e.clientX;
document.onmousemove = function (e) {
e.preventDefault(); // 移动时禁用默认事件
//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';
}
}
changeContentSize(dragDom)
};
//拉伸结束
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
//拉伸(左边)
let resizeElL = document.createElement("div");
dragDom.appendChild(resizeElL);
//在弹窗右下角加上一个10-10px的控制块
resizeElL.style.cursor = 'w-resize';
resizeElL.style.position = 'absolute';
resizeElL.style.height = '100%';
resizeElL.style.width = '10px';
resizeElL.style.left = '0px';
resizeElL.style.top = '0px';
//鼠标拉伸弹窗
resizeElL.onmousedown = (e) => {
let elW = dragDom.clientWidth;
let EloffsetLeft = dragDom.offsetLeft;
// 记录初始x位置
let clientX = e.clientX;
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';
}
}
}
changeContentSize(dragDom)
};
//拉伸结束
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
// 拉伸(下边)
let resizeElB = document.createElement("div");
dragDom.appendChild(resizeElB);
//在弹窗右下角加上一个10-10px的控制块
resizeElB.style.cursor = 'n-resize';
resizeElB.style.position = 'absolute';
resizeElB.style.height = '10px';
resizeElB.style.width = '100%';
resizeElB.style.left = '0px';
resizeElB.style.bottom = '0px';
//鼠标拉伸弹窗
resizeElB.onmousedown = (e) => {
let EloffsetTop = dragDom.offsetTop;
let ELscrollTop = el.scrollTop;
let clientY = e.clientY;
let elH = dragDom.clientHeight;
document.onmousemove = function (e) {
e.preventDefault(); // 移动时禁用默认事件
//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) + 'px';
}
}
//往下拖拽
if (clientY < e.clientY) {
dragDom.style.height = elH + (e.clientY - clientY) + 'px';
}
}
changeContentSize(dragDom)
};
//拉伸结束
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
}
}
</script>
