imobile_for_reactnative/utils/AppProgress.ts

iMobile for ReactNative，是SuperMap iMobile推出的一款基于React-Native框架的移动应用开发工具。基于该开发工具，用户可以使用JavaScript开发语言，开发出在Android和IOS操作系统下运行的原生移动GIS应用，入门门槛低，一次开发，处处运行。

/**
 * 管理下载，导入等进度
 * 通过唯一的 key 来区分任务
 */


const _progressList: Array<{key: string, progress: number, downloaded: boolean}> = []
const _progressListeners: Array<{key: string, onBegin(): void, onProgress(progers: number): void, onEnd(): void}> = []

// ******************** 添加并更新任务进度 ********************

function addProgress(key: string) {
  if(_progressList.some(item => (item.key === key && !item.downloaded))) {
    __DEV__ && console.error('id or key is dupiliacateed')
  } else {
    removeProgress(key)
    _progressList.push({key, progress: 0, downloaded: false})
    const listener = _progressListeners.find(item => item.key === key)
    listener && listener.onBegin()
  }
}

function updateProgress(key: string, progress: number) {
  const job = _progressList.find(item => item.key === key)
  if(job) {
    job.progress = progress
    const listener = _progressListeners.find(item => item.key === key)
    listener && listener.onProgress(progress)
  } else {
    __DEV__ && console.error('cannot find the progress')
  }
}

function onProgressEnd(key: string) {
  const job = _progressList.find(item => item.key === key)
  if(job) {
    job.downloaded = true
  }
  const listener = _progressListeners.find(item => item.key === key)
  listener && listener.onEnd()
}

function removeProgress(key: string) {
  const index =_progressList.findIndex(item => item.key === key)
  if(index > -1) {
    _progressList.splice(index, 1)
  }
}

// ******************** 监听任务进度变化 ********************

function addProgressListener(key: string, onBegin: () => void, onProgress: (progerss: number) => void, onEnd: () => void) {
  if(_progressListeners.some(item => item.key === key)) {
    __DEV__ && console.error('key is duplicated')
  } else {
    _progressListeners.push({onProgress, key, onEnd, onBegin})
  }
}

function removeProgressListener(key: string) {
  _progressListeners.splice(
    _progressListeners.findIndex(item => item.key === key),
    1
  )
}

function isInProgress(key: string): boolean {
  const job = _progressList.find(item => {
    return (item.key === key && !item.downloaded)
  })
  return job !== undefined
}

function isProgressEnd(key: string): boolean {
  const job = _progressList.find(item => item.key === key)
  return job ? job.downloaded : false
}

export default {
  addProgress,
  updateProgress,
  onProgressEnd,
  addProgressListener,
  removeProgressListener,
  isInProgress,
  isProgressEnd,
}