关于前端:可拖拽流程图组件开发

成果

说在后面

因为本人有需要，想要一个能够自在拖拽排序的流程图组件，在网上没有找到适合的 demo，所以便本人动手做了这样一个雏形。

组件设计

首先须要设计好配置参数，而后就是讲配置参数融入到款式的设计解决上，最初是实现组件拖动并实时展现成果。

参数

整体参数

data 流程项参数

构造如下

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

性能

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;
}

拖拽性能

//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);// 展现的节点
    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;
},

// 挪动时实时展现成果
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();}
},

// 确定最终地位
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