BeiJinSettleAccount/code/WebApp/vue/src/directives.js

import Vue from "vue";

// v-dialogDrag: 弹窗拖拽+水平方向伸缩
/*

*  使用方法

*  将以下代码复制到一个js文件中，然后在入口文件main.js中import引入即可；

*  给elementUI的dialog上加上 v-dialogDrag 指令就可以实现弹窗的全屏和拉伸了。

*  给dialog设置 :close-on-click-modal="false" , 禁止点击遮罩层关闭弹出层

*  如果是form表单，不要将提交等按钮放置el-form-item，以免在上下拉伸时被隐藏

*/
Vue.directive('dialogDrag', {
  bind(el, binding, vnode, oldVnode) {
    //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 = (() => {
        if (window.document.currentStyle) {
            return (dom, attr) => dom.currentStyle[attr];
        } else {
            return (dom, attr) => getComputedStyle(dom, false)[attr];
        }
    })()

    // // 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);
    dialogHeaderEl.onmousedown = (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 screenWidth = document.body.clientWidth; // body当前宽度
        const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)

        const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
        const dragDomheight = dragDom.offsetHeight; // 对话框高度

        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 = sty(dragDom, 'left');
        let styT = sty(dragDom, 'top');

        // 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 (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
            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;`;
        };

        document.onmouseup = function (e) {
            document.onmousemove = null;
            document.onmouseup = null;
        };
    }
    //双击头部全屏效果
    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;
          };
        }
      }
    }
  }
})