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状态录制

本章你可以学习到
  • 通过 State 记录用户操作。
  • 通过 State 还原用户操作画面。
  • 在 React 中管理定时器与事件清理。

React 示例：模式切换 + 环视​

import { useEffect, useRef, useState } from 'react'
import { Five, Mode, parseWork } from '@realsee/five'

const workURL = 'https://vr-public.realsee-cdn.cn/release/static/image/release/five/work-sample/07bdc58f413bc5494f05c7cbb5cbdce4/work.json'

export default function FiveRecord() {
  const containerRef = useRef(null)
  const fiveRef = useRef(null)
  const [mode, setMode] = useState('Panorama')
  const timerRef = useRef(null)

  useEffect(() => {
    const five = new Five()
    fiveRef.current = five
    if (containerRef.current) five.appendTo(containerRef.current)
    fetch(workURL).then(r=>r.json()).then(json=>five.load(parseWork(json)))

    const onResize = () => five.refresh()
    const onState = (s) => setMode(s.mode)
    window.addEventListener('resize', onResize, false)
    five.on('stateChange', onState)

    return () => {
      window.clearInterval(timerRef.current)
      window.removeEventListener('resize', onResize, false)
      five.off('stateChange', onState)
      five.dispose()
    }
  }, [])

  const switchMode = (m) => fiveRef.current?.setState({ mode: m })
  const startLookAround = () => {
    window.clearInterval(timerRef.current)
    timerRef.current = window.setInterval(() => {
      const f = fiveRef.current
      if (!f) return
      f.setState({ longitude: f.state.longitude + Math.PI / 360 })
    }, 16)
  }
  const stopLookAround = () => window.clearInterval(timerRef.current)

  return (
    <div style={{ width: '100vw', height: '100vh' }}>
      <div ref={containerRef} style={{ width: '100%', height: '100%', overflow: 'hidden' }} />
      <div style={{ position: 'fixed', bottom: 16, left: 0, right: 0, display: 'flex', justifyContent: 'center', gap: 8 }}>
        <button className={mode==='Panorama'?'btn btn-primary':'btn btn-outline-primary'} onClick={()=>switchMode('Panorama')}>全景漫游</button>
        <button className={mode==='Floorplan'?'btn btn-primary':'btn btn-outline-primary'} onClick={()=>switchMode('Floorplan')}>空间总览</button>
      </div>
      <div style={{ position: 'fixed', top: 16, right: 16, display: 'flex', gap: 8 }}>
        <button className="btn btn-light" onClick={startLookAround}>开始环视</button>
        <button className="btn btn-light" onClick={stopLookAround}>停止环视</button>
      </div>
    </div>
  )
}