element-ui 中 Dialog 弹框拖动
借用网上样例，网上样例不支持在浏览器可见范围内拖动，在结合vue-element-admin中弹框拖动的模块合并更改的。
问题：与容器的 position: absolute 冲突
export default {
bind(el, binding, vnode) {
//element-ui弹框拖动效果：双击表头全屏，可拖动（区域限制在可视化区域），可拉取宽高
const dialogHeaderEl = el.querySelector(".el-dialog__header");
const dragDom = el.querySelector(".el-dialog");
dialogHeaderEl.style.cssText += ";cursor:move;";
dragDom.style.cssText += ";top:0px;";
dialogHeaderEl.onselectstart = new Function("return false");
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;
// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
const getStyle = (function () {
if (window.document.currentStyle) {
return (dom, attr) => dom.currentStyle[attr];
} else {
return (dom, attr) => getComputedStyle(dom, false)[attr];
}
})();
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;
const dragDomWidth = dragDom.offsetWidth;
const dragDomHeight = dragDom.offsetHeight;
const screenWidth = document.body.clientWidth;
const screenHeight = document.body.clientHeight;
console.log(document);
const minDragDomLeft = dragDom.offsetLeft;
const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
const minDragDomTop = dragDom.offsetTop;
const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomHeight;
// 获取到的值带px 正则匹配替换
let styL = getStyle(dragDom, "left");
let styT = getStyle(dragDom, "top");
if (styL.includes("%")) {
styL = +document.body.clientWidth * (+styL.replace(/\%/g, "") / 100);
styT = +document.body.clientHeight * (+styT.replace(/\%/g, "") / 100);
} else {
styL = +styL.replace(/\px/g, "");
styT = +styT.replace(/\px/g, "");
}
document.onmousemove = function (e) {
// 通过事件委托，计算移动的距离
let left = e.clientX - disX;
let top = e.clientY - disY;
//---------边界处理（可视化区域）----------------------------------------------------------------------------------------------------------//
if (-left > minDragDomLeft) {
left = -minDragDomLeft;
} else if (left > maxDragDomLeft) {
left = maxDragDomLeft;
}
if (-top > minDragDomTop) {
top = -minDragDomTop;
} else if (top > maxDragDomTop) {
top = maxDragDomTop;
}
//--------------------------------------------------------------------------------------------------------------------------------------------//
// 移动当前元素
dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`;
// emit onDrag event
vnode.child.$emit("dragDialog");
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
};
dialogHeaderEl.onmousedown = moveDown;
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 > document.documentElement.clientHeight
? document.documentElement.clientHeight
: 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;
};
}
};
};
},
};
import drag from './drag'
//用法，需要使用页面路径引入：import elDragDialog from '@/directive/el-dragDialog'
//页面注册命令： directives: { elDragDialog }
//模块化单独引用，禁止改动
//不全局引用
const install = function(Vue) {
Vue.directive('el-drag-dialog', drag)
}
if (window.Vue) {
window['el-drag-dialog'] = drag
Vue.use(install); // eslint-disable-line
}
drag.install = install
export default drag
