vue2 - element弹框自定义指令 实现拖动、缩放

directive/dialogDrag.js

import Vue from "vue";
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 = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

        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;
        //双击(头部)效果不想要可以注释
        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;
            }
        }

        //拉伸(右下方)效果不想要可以注释
        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);//这里 由于elementUI的dialog控制居中的,所以水平拉伸效果是双倍
                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';
            };
            //拉伸结束
            document.onmouseup = function (e) {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        }

        //拉伸(右边)效果不想要可以注释
        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';
                    }
                }

            };
            //拉伸结束
            document.onmouseup = function (e) {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        }

        //拉伸(左边)效果不想要可以注释
        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';

                        }
                    }
                }

            };
            //拉伸结束
            document.onmouseup = function (e) {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        }

        // 拉伸(下边)效果不想要可以注释
        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) * 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;
            };
        }
    }
})

main.js

import dialogDrag from './directive/dialogDrag'

Vue.use(dialogDrag)
posted @ 2024-08-12 11:48  seekHelp  阅读(156)  评论(0编辑  收藏  举报