利用vue自定义指令directive实现拖动elementUI的dialog

叁歲伎倆 2021-12-20 00:39 332阅读 0赞

<template>
            <el-dialog :visible.sync="testDialog" title="测试弹框拖拽" v-dialogDrag="{ x: transformX, y: transformY }" :close-on-click-modal="false" :append-to-body="true" :modal-append-to-body="true">
    
            </el-dialog>
    </template>
    <script>
        Vue.directive('dialogDrag', {
            bind(el, binding, vnode, oldVnode) {
                // 获取拖拽内容头部
                const dialogHeaderEl = el.querySelector('.el-dialog__header');
                const dragDom = el.querySelector('.el-dialog');
                dragDom.style.transform="translate("+binding.value.x+"px,"+binding.value.y+"px)";
                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);
                // 鼠标按下事件
                dialogHeaderEl.onmousedown = (e) => {
                    // 鼠标按下，计算当前元素距离可视区的距离 (鼠标点击位置距离可视窗口的距离)
                    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)+binding.value.x;
                        styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100)+binding.value.y;
                    } else {
                        styL = +sty.left.replace(/\px/g, '')+binding.value.x;
                        styT = +sty.top.replace(/\px/g, '')+binding.value.y;
                    };
                    // 鼠标拖拽事件
                    document.onmousemove = function (e) {
                        // 通过事件委托，计算移动的距离 （开始拖拽至结束拖拽的距离）
                        const l = e.clientX - disX;
                        const t = e.clientY - disY;
                        let finallyL = l + styL;
                        let finallyT = t + styT;
                        // 边界值判定 注意clientWidth scrollWidth区别 要减去之前的top left值
                        if (finallyL < 0) {顶部
                            finallyL = 0
                        } else if (finallyL > dragDom.offsetParent.clientWidth - dragDom.clientWidth) {///底部
                            finallyL = dragDom.offsetParent.clientWidth - dragDom.clientWidth
                        }
    
                        if (finallyT < 0) {顶部
                            finallyT = 0
                        } else if (finallyT > dragDom.offsetParent.clientHeight - dragDom.clientHeight) (///底部
                            finallyT = dragDom.offsetParent.clientHeight - dragDom.clientHeight
                        )
                        binding.value.x=finallyL;
                        binding.value.y=finallyT;
                        dragDom.style.transform="translate("+finallyL+"px,"+finallyT+"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;
                    };
                }
            }
        })
        export default {
            name: "testDialog",
            data(){
                return{
                    testDialog:true,
                    transformX:100,
                    transformY:200
                }
            },
            methods:{
                open:function () {
                    this.testDialog=true
                }
            }
        }
    </script>
    <style>
            .el-dialog{
                    margin: 0 !important;
                    /*transform: translate(366px, 140px);*/
            }
    </style>

网上实现的demo挺多的，这里主要是使用

transform: translate(x,y)来实现移动