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2分钟教你实现环形/扇形菜单(基础版)
日期：2021-09-05 18:21:18 来源：脚本之家

前言

项目需要用到环形菜单，初略在网上找了一下，没有找到合适的，于是自己写了一个很简单的，后续再优化。

这个组件是基于react,但是原理都一样。

展开效果如下：

2分钟教你实现环形/扇形菜单(基础版)

实现

css(less)

@centerIconSize: 30px;

.flex(@justify: flex-start, @align: center) {
    justify-content: @justify;
    align-items: @align;
    display: flex;
}
.sector-menu-wrapper {
    position: relative;
    width: @centerIconSize;
    margin: auto;

    .center-icon {
        .flex(center);
        width: @centerIconSize;
        height: @centerIconSize;
        border-radius: 50%;
        background: rgba(0, 0, 0, 0.3);
        color: white;
        cursor: pointer;
    }

    .sector-item {
        position: absolute;
        .flex(center);
        width: @centerIconSize;
        height: @centerIconSize;
        border-radius: 50%;
        background: rgba(0, 0, 0, 0.3);
        cursor: pointer;
        color: white;
        top: 0;
        left: 0;
        transition: all linear 0.5s;
        transform: translate(0, 0);
        // display: none;
        visibility: hidden;
    }

    .sector-list {
        &.sector-list-active {
            transition: all linear 0.5s;
            .sector-item {
                .flex(center);
                transition: all linear 0.5s;
                transform: translate(0, 0);
                visibility: visible;

                &:first-child {
                    transform: translate(0, -@centerIconSize * 1.5);
                }
        
                &:nth-child(2) {
                    transform: translate(-@centerIconSize * 1.5, 0);
                }
        
                &:nth-child(3) {
                    transform: translate(0, @centerIconSize * 1.5);
                    
                }
            }
        }
    }
}

SectorMenu.js

import React from 'react';

export default class SectorMenu extends React.Component {
    state = {
        direction: 'left',
        sectorMenuVisible: false,
        centerIconSize: 30,
        sectorItemSize: 30,
    }

    /**
     * 显示环形菜单
     */
    showSectorMenu = () => {
        const { sectorMenuVisible } = this.state;
        this.setState({
            sectorMenuVisible: !sectorMenuVisible,
        })
    }

    onClickSectorMenuItem = (index) => {
        const { sectorMenuItemFunctions } = this.props;
        if (!sectorMenuItemFunctions || typeof(sectorMenuItemFunctions[index]) !== 'function') {
            return;
        }
        sectorMenuItemFunctions[index]();
    }

    getSectorJsx = () => {
        const { sectorMenuItems } = this.props;

        if (!sectorMenuItems || !Array.isArray(sectorMenuItems) || sectorMenuItems.length === 0) {
            return;
        }

        const styles = {};
        const {  sectorMenuVisible } = this.state;

        return sectorMenuItems.map((item, i) => {
            // const styles = {
            //     transform: translate(0, -centerIconSize * 2);
            // };

            return (<div
                className={`sector-item ${sectorMenuVisible && 'sector-item-active'}`}
                style={styles}
                onClick={() => this.onClickSectorMenuItem(i)}
                key={i}
            >
                {item}
            </div>)
        });
    }
    render() {
        const { sectorMenuVisible } = this.state;
        return (
            <div className="sector-menu-wrapper">
                <div className="center-icon" onClick={this.showSectorMenu}>
                    {
                        sectorMenuVisible ? 'x' : '···'
                    }
                </div>
                <div className={`sector-list ${sectorMenuVisible && 'sector-list-active'}`}>
                    {this.getSectorJsx()}
                </div>
            </div>
        )
    }
}

调用

<SectorMenu
    sectorMenuItems={['A1', 'A2', 'A3']}
    sectorMenuItemFunctions={[function () {console.log(0)}, function () {console.log(1)}, function () {console.log(2)}]}
/>

期望

本来是想写成灵活分布，在怎么计算位置这里稍稍卡了一下，项目时间紧，改天抽空优化一下