element技巧之element的dialog弹出框可拖拽、可拉伸、可全屏并处理边界问题

directives: {
        // v-dialogDrag: 弹窗拖拽+水平方向伸缩
        dialogDrag: {
            bind(el, binding, vnode, oldVnode) {
                let _this = this;
                //弹框可拉伸最小宽高
                let dialogTables = null;
                let minWidth = 820;

                let minHeight = 420;

                //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 .header-title-drag');


                //弹窗

                const dragDom = el.querySelector('.el-dialog');

                //获取当前dialog id
                const dialogID = el.id;

                //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 = "hidden";

                //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';

                dialogHeaderEl.style.cssText += ';cursor:move;';
                dragDom.style.cssText += ';top:0px;';

                // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
                const sty = (function() {
                    if (window.document.currentStyle) {
                        return (dom, attr) => dom.currentStyle[attr];
                    } else {
                        return (dom, attr) => getComputedStyle(dom, null)[attr];
                    }
                })();
                //拖拽边界优化
                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 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('%')) {
                        // eslint-disable-next-line no-useless-escape
                        styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100);
                        // eslint-disable-next-line no-useless-escape
                        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;
                    };
                    return false;
                };

                dialogHeaderEl.onmousedown = moveDown;

                //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) {

                                    if(dialogID =="dialog-detail"){
                                        dialogTables = document.getElementById('childTable')
                                    }
                                    if(dialogID =="dialog-error-detail"){
                                        dialogTables = document.getElementById('childErrorTable')
                                    }
                                    if(dialogID =="dialog-bill-detail"){
                                        dialogTables = document.getElementById('childBillTable')
                                    }
                                    // 往上拖拽

                                    if (clientY > e.clientY) {

                                        if (dragDom.clientHeight < minHeight) {

                                        } else {

                                            dragDom.style.height = elH - (clientY - e.clientY) * 2 + 'px';
                                            let  changeHeightSize = elH - (clientY - e.clientY) * 2;
                                            // dialogTables.style.height = (changeHeightSize - 109 - 25 - 32)*0.1522 + 'vh'
                                            dialogTables.style.height = (changeHeightSize - 84 - 25) + 'px'
                                        }

                                    }

                                    //往下拖拽

                                    if (clientY < e.clientY) {
                                        dragDom.style.height = elH + (e.clientY - clientY) * 2 + 'px';
                                        let  changeHeightSize = elH - (clientY - e.clientY) * 2;
                                        // dialogTables.style.height = (changeHeightSize - 109 - 25 - 32)*0.1522 + 'vh'
                                        dialogTables.style.height = (changeHeightSize - 84 - 25) + 'px'
                                    }

                                }

                            };

                            //拉伸结束

                            document.onmouseup = function (e) {

                                document.onmousemove = null;

                                document.onmouseup = null;

                            };

                        }

                    }

                }
            }
        }
    },

注意:使用方式

把上述新建插件放入vue文件中,然后将v-dialogDrag放入标签

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