可拖拽流程图组件开发

效果

说在前面

因为自己有需求，想要一个可以自由拖拽排序的流程图组件，在网上没有找到合适的demo，所以便自己动手做了这样一个雏形。

组件设计

首先需要设计好配置参数，然后就是讲配置参数融入到样式的设计处理上，最后是实现组件拖动并实时展示效果。

参数

整体参数

参数	描述
title	标题（String）
dragAble	是否可拖拽（Boolean）
width	图标最小宽度（number）
radius	是否圆角（Boolean）
data	流程项（Array）

data流程项参数

结构如下

[
    {
        icon:require('@/assets/logo.png'),//图标
        text:'准备'//文字
    },
    {
        icon:require('@/assets/1.png'),
        text:'开始'
    },
]

功能

监听鼠标事件

//是否可拖拽
if(this.chartData.dragAble){
    window.addEventListener('mouseup',this.handleMouseup);
    window.addEventListener('mouseover',this.handleMouseover);
}

初始化数据

//初始化数据
initData(){
    let data = this.vChartDataList;
    let res = [],flag = true,temp = [];
    for(let i = 1; i <= data.length; i++){
        data[i - 1].id = 'item' + '-' + res.length + '-' + (i - 1);
        if(flag) temp.push(data[i - 1]);
        else temp.unshift(data[i - 1]);
        if(i % this.itemNum == 0 || i == data.length){
            res.push([...temp]);
            temp = [];
            flag = !flag;
        }
    }
    this.chartDataList = res;
}

拖拽功能

//item点击事件
itemClick(index1,index,id,item){
    if(!this.chartData.dragAble) return;
    this.selectedItem = {...item};
    this.selectedItem.opacity = '0.5';
    let num = parseInt(id.split('-')[2]);
    let dom = document.getElementById('moveDiv');
    let dom1 = document.getElementById(id);//展示的节点
    let d = document.getElementById('chartContent');
    d.style.border="dashed 1px blue";
    // this.vChartDataList.splice(num,1);
    this.oldInd = num;
    this.initData();
    this.operateDom = dom;//记录操作的节点
    this.operateDomNum = num;
    this.startX = dom1.offsetLeft;
    this.startY = dom1.offsetTop;
    dom.style.visibility = 'inherit';
    dom.style.position = 'fixed';
    dom.style.left = dom1.offsetLeft;
    dom.style.top = dom1.offsetTop;
},

//移动时实时展示效果
handleMouseover(event){
    if(this.vChartDataList.length < this.chartData.data.length){
        this.vChartDataList.unshift({...this.chartData.data[0]});
    }
    if(this.operateDom != null){
        const w = this.operateDom.offsetWidth,h = this.operateDom.offsetHeight;
        let x = event.pageX,y = event.pageY;
        this.operateDom.style.position = 'fixed';
        this.operateDom.style.opacity = '0.5';
        this.operateDom.style.left = x - w / 2 + 'px';
        this.operateDom.style.top = y - h / 2 + 'px';
        let {tx,ty} = this.getItemCoords(x,y);
        let oldInd = this.oldInd;
        if(oldInd >= 0){
            this.vChartDataList.splice(oldInd,1);
            this.initData();
        }
        let nty = (parseInt(ty) % 2 == 0 ? parseInt(tx) : this.itemNum - parseInt(tx));
        nty = Math.min(nty,this.itemNum);
        nty = Math.max(nty,0);
        oldInd = parseInt(ty) * this.itemNum + nty;
        oldInd = Math.min(this.chartData.data.length - 1,oldInd);
        oldInd = Math.max(0,oldInd);
        this.oldInd = oldInd;
        if(oldInd < 0) return;
        this.vChartDataList.splice(oldInd,0,{...this.selectedItem});
        this.initData();
    }
},

//确定最终位置
handleMouseup(event){
    const chartContent = document.getElementById('chartContent');
    const dom = document.getElementById('moveDiv');
    const w = chartContent.offsetWidth,
        h = chartContent.offsetHeight,
        l = chartContent.offsetLeft,
        t = chartContent.offsetTop;
    const x = event.pageX,y = event.pageY;
    dom.style.visibility = 'hidden';
    // if(x > l && x < (l + w) && y > t && y < (t + h)){
        
    // }else{ 
        
    // }
    if(this.vChartDataList[this.oldInd]) this.vChartDataList[this.oldInd].opacity = 1;
    chartContent.style.border='none';
    this.operateDom = null;
    this.operateDomNum = null;
    this.oldInd = null;
},

代码

Gitee地址：https://gitee.com/zheng_yongtao/jyeontu-component-warehouse

预览地址

http://jyeontu.xyz/JYeontuComponents/#/flowChartView