react 手写树形渲染组件

css

.tree {
  width: 100vw;
  text-align: left;
  position: relative;

}

.tree-item {
  height: 45px;
  line-height: 45px;
  display: flex;
  align-items: center;
  justify-content: space-evenly;
}

.tree-item-onOff {
  width: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  display: contents;
}

.tree-item-onOff image {
  width: 9px;
  height: 5px;
  display: block;
  transition: 0.4s;
}

.tree-item-onOff-closed {
  transform: rotate(-90deg);
}

.tree-item-onOff-open {
  transform: rotate(0deg);
}

.tree-item-name {
  width: calc(100% - 40px);
  display: flex;
  align-items: center;
  padding-left: 10px;
}

.name {
  /* width: calc(100% - 50px); */
  width: 80%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.img {
  width: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.img image {
  width: 15px;
  height: 10px;
  display: block;
}

.tree-item-name-select {
  background: #ECF7FA;
  color: #0079FE;
}

.tree-item-name-select2 {
  color: #0079FE;
}

.img-yuan {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid #0079FE;
  right: 30px;
  position: absolute;
}

.img-yuan-Choice{
  background:  #0079FE;
}

import React from 'react';
import Tree from './Tree '
 const Index = () =>{


     const [treeData2, setTreeData] = React.useState(  [
         {
             name: 'node1',
             id: 1,
             children: [
                 { name: 'node1-1', id: 3 },
                 {
                     name: 'node1-2',
                     id: 4,
                     children: [
                         { name: 'node1-2-1', id: 5 },
                         { name: 'node1-2-2', id: 6 },
                         {
                             name: 'node1-2',
                             id: 4,
                             children: [
                                 { name: 'node1-2-1', id: 5 },
                                 { name: 'node1-2-2', id: 6 },
                             ],
                         },
                     ],
                 },
                 {
                     name: 'node1-2',
                     id: 4,
                     children: [
                         { name: 'node1-2-1', id: 5 },
                         { name: 'node1-2-2', id: 6 },
                         {
                             name: 'node1-2',
                             id: 4,
                             children: [
                                 { name: 'node1-2-1', id: 5 },
                                 { name: 'node1-2-2', id: 6 },
                             ],
                         },
                     ],
                 },
             ],
         },
         { name: 'node2', id: 2 },
     ]);
     const handleEventFromChild = (eventData) => {
         const treeData = [...treeData2];

         // 取消所有选中
         const chooseToCancel =(data)=> {
             // 遍历数组
             data.forEach((item) => {
                 // 如果当前项有children属性
                 if (item.children && Array.isArray(item.children)) {
                     item.selectItem = false
                     // 对当前项的children递归调用此函数
                     chooseToCancel(item.children);
                 }else{
                     item.selectItem = false
                 }
             });
         }
         chooseToCancel(treeData);


         // 选中点击这个
         const choiceItem = (data) => {
             // 遍历数组
             data.forEach((item) => {
                 if (item.children && Array.isArray(item.children)) {
                     if(item.id === eventData.id){
                         item.selectItem = true
                     }
                     // 对当前项的children递归调用此函数
                     choiceItem(item.children);
                 }else{
                     console.log(item.id,'item.id2222')
                     if(item.id === eventData.id){
                         item.selectItem = true
                     }
                 }
             });
         }
         choiceItem(treeData);

         setTreeData(()=>[...treeData])
         // 在这里处理从递归组件传递上来的事件数据
     };

     // 点击节点展开
     const clickOpenItem = (eventData) =>{
         const treeData = [...treeData2];
         // 递归节点展开
         const openItem =(data) => {
             // 遍历数组
             data.forEach((item) => {
                 if (item.children && Array.isArray(item.children)) {
                     if(item.id === eventData.id){
                         item.open = !item.open
                     }
                     // 对当前项的children递归调用此函数
                     openItem(item.children);
                 }else{
                     if(item.id === eventData.id){
                         item.open = !item.open
                     }
                 }

             });
         }
         openItem(treeData);

         setTreeData(()=>[...treeData])
     }

    return (
        <div style={{width: '100%', height: '50vh',overflow: 'auto'}}>
                <Tree treeData={treeData2} level={1} onEvent={handleEventFromChild} onOpenItem={clickOpenItem}/>
        </div>
    )

}
export default Index

树形组件 Tree.js

import React from 'react';

const Treediv = props => {
  const { treeData, level = 0,onEvent,onOpenItem } = props

  // 选中当前
  const handleClick = (eventData) => {
    // 处理事件逻辑...
    onEvent(eventData); // 通过回调将事件数据传递给父组件
  };

  // 展开节点事件
  const handleOpenItem = (eventData) => {
    // 处理事件逻辑...
    onOpenItem(eventData); // 通过回调将事件数据传递给父组件
  };

  const [selectKey, setSelectKey] = React.useState('');


  const jsw = (w, d) => {
    return (w - 2) * d;
  };

  return (
      treeData.map((itemTree, indexItem) => (
      <div
        className="tree"
        key={itemTree.id}
        style={{
          width: `calc(100vw - ${
            level >= 3 ? level * 10 + jsw(level, 10) : level * 10
          }px)`,
          paddingLeft: `${level * 10}px`,
        }}
      >
        <div className="tree-item tree-item-select">
          {itemTree.children && itemTree.children.length > 0 ? (
            <div
              className="tree-item-onOff"
              onClick={() => {
                handleOpenItem(itemTree)
              }}
            >
              {itemTree.open}
              <img
                src={new URL('./assets/u1490.svg', import.meta.url).href}
                className={
                  itemTree.open
                    ? 'tree-item-onOff-open'
                    : 'tree-item-onOff-closed'
                }
              />
            </div>
          ) : (
            <div className="tree-item-onOff"></div>
          )}

          <div
            className={`tree-item-name ${
              selectKey == itemTree.id ? 'tree-item-name-select' : ''
            }`}
            style={{
              width: `calc(100vw - ${level * 10}px)`,
              paddingRight: `${level >= 3 ? level * 10 + jsw(level, 10) : level * 10}px`,
            }}
            onClick={() =>{
              handleClick(itemTree)
            } }
          >
            <div className="name">{itemTree.name}</div>
            <div className={`img-yuan ${ itemTree.selectItem && "img-yuan-Choice"}`}
                 style={{
                   marginRight: `${ level * 10}px`,
                 }}
            >
              {itemTree.selectItem}
              {/* <img src="./assets/icon/u435.svg" /> */}
            </div>
          </div>
        </div>
        {itemTree.children && itemTree.open && itemTree.children.length > 0 && (
          <Treediv treeData={itemTree.children} level={level + 1} onEvent={onEvent}  onOpenItem={onOpenItem}/>
        )}
      </div>
    ))
  );
};
export default Treediv

svg 三角形

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