funAreaSelectPlus.js
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import React, { Component } from 'react';
import FunAreaSelect from "../funAreaSelect/funAreaSelect.js"
export default class FunAreaSelectPlus extends Component {
constructor() {
super();
this.state = {
id: new Date().getTime() + "waiceng",
disabled: "false",//判断是否可以移动 false是可以移动
circleRadius: 5,//圆半径
circleBorderWidth: 2,//圆边线的半径宽
circleBorderColor: "#28B1D9",//圆边线的颜色
circleInColor: "#28B1D9",//圆里里面的颜色
circleSelectColor: "#FFF",
lineColor: "#28B1D9",//线的颜色
lineWidth: 2,//线的宽度
areaColor: "rgba(40, 177, 217, 0.2)",//选中区域颜色
disabled: "false",//判断是否可以移动 false是可以移动
title: "",//文字的内容
titleColor: "#000",//文字的颜色
titleFont: "14px bold 黑体",//文字的字体
titleLineHeight: "",//文字的行高
position: [10, 10],//文字的位置
}
}
static getDerivedStateFromProps(props, state) {
var obj = {};
for (var key in props) {
if (props[key] && props[key] !== state[key]) {
if (typeof props[key] === "object") {
obj[key] = JSON.parse(JSON.stringify(props[key]))
} else {
obj[key] = props[key]
}
}
}
if (Object.keys(obj).length > 0) {
return obj;
} else {
return null
}
}
componentDidMount() {
let {list} = this.props;
if(list&&list.length>0){
this.selectIndex = list[list.length - 1].id;
}
this.selectArea();
}
clickIt(mode) {
let { list } = this.props;
var id = new Date().getTime()
if (!list||list.length === 0) {
list = []
list.push({
id: id,
mode: mode
})
this.selectIndex = id;
} else {
var boo = this[list[list.length - 1].id + list[list.length - 1].mode].isNull()//判断画布是否为空
if (boo) {//画布为空
this.props.err(false,"画布为空，请先绘制在添加。")
} else if (!list[list.length - 1].serviceData) {
this.props.err(false,"画布没有保存，请先绘制完成在添加")
} else {
list.push({
id: id,
mode: mode
})
this.selectIndex = id;//这个地方是用来判断当前点击或者添加的第几个，通过这个控制着list父子组件的同时赋值
}
}
this.props.change(list)
}
delete(){
this.props.delete(this.selectIndex,"发出删除指令")
}
change(val) {//保存后把最后一个放入这个list中储存，这样可以判断是否储存，点击的时候是否在点内
let { list } = this.props;
list = list.map(item=>{
if(item.id === this.selectIndex){
item.serviceData = JSON.parse(JSON.stringify(val));
}
return item
})
this.props.change(list)
}
selectArea() {//选中区域z-index应该增大放在最上面
let { id } = this.state;
var waiceng = document.getElementById(id);
waiceng.onclick = (e) => {
// let { list } = this.state;
let list = this.props.list//这里用里this.list因为有时候在change中setState不好使不能设置list怀疑是this指向问题但是打印出来没什么问题所以还没解决
var left = e.layerX
var top = e.layerY
this.indexflag = false;//这里是为了防止点击到重复的区域导致无法选区的情况
if(list){
for (var i = 0; i < list.length; i++) {
if (list[i].serviceData) {
var myRef = this[list[i].id + list[i].mode].state.id;//获取内部id
if (this.isInPolygon([left, top], JSON.parse(JSON.stringify(list[i].serviceData)), this[list[i].id + list[i].mode][myRef])) {//选中之后放在最上层
var id = this[list[i].id + list[i].mode][myRef].state.id
if (this.indexflag) {
document.getElementById(id).style.zIndex = 0
} else {
document.getElementById(id).style.zIndex = 99
this.selectIndex = list[i].id;
this.indexflag = true
}
} else {
var id = this[list[i].id + list[i].mode][myRef].state.id
document.getElementById(id).style.zIndex = 0
}
}
}
}
}
}
isInPolygon(point, vs, childEl) {//判断多边形是否在点内
var x = point[0], y = point[1];
var inside = false;
for (var i = 0, j = vs.length - 1; i < vs.length; j = i++) {
var xi = vs[i][0], yi = vs[i][1];
var xj = vs[j][0], yj = vs[j][1];
var intersect = ((yi > y) != (yj > y))
&& (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
if (intersect) inside = !inside;
}
if (!intersect) {
if (childEl.selectBox(point[0], point[1])) {
return true;
}
}
return inside;
}
render() {
let { id, disabled, circleRadius,
circleBorderWidth,
circleBorderColor,
circleInColor,
circleSelectColor,
lineColor,
lineWidth,
areaColor,
title,
titleColor,
titleFont,
titleLineHeight,
position } = this.state;
let {list} = this.props
return (
<div id={id} style={{ width: "100%", height: "100%", position: "relative" }}>
<button style={{ position: "absolute", right: "-70px", top: "0" }} onClick={() => this.clickIt("react")}>添加矩形</button>
<button style={{ position: "absolute", right: "-83px", top: "40px" }} onClick={() => this.clickIt("polygon")}>添加多边形</button>
<button style={{ position: "absolute", right: "-43px", top: "80px" }} onClick={() => this.delete()}>删除</button>
{
list&&list.map((item, index) => {
return <FunAreaSelect
disabled={disabled}
circleRadius={circleRadius}
circleBorderWidth={circleBorderWidth}
circleBorderColor={circleBorderColor}
circleSelectColor={circleSelectColor}
circleInColor={circleInColor}
lineColor={lineColor}
lineWidth={lineWidth}
areaColor={areaColor}
title={item.title?item.title:""}
titleColor={titleColor}
titleFont={titleFont}
titleLineHeight={titleLineHeight}
position={position} key={item.id} serviceData={item.serviceData}ref={(inst) => { this[item.id + item.mode] = inst }} mode={item.mode} change={(val) => this.change(val)}></FunAreaSelect>
})
}
</div>)
}
}