@pmwcs/base/utils/emitter.js

PMWCS base module

export class EventEmitter {
  constructor () {
    this.events_ = {}
  }

  on (event, cb) {
    this.events_ = this.events_ || {}
    this.events_[event] = this.events_[event] || []
    this.events_[event].push(cb)
  }

  off (event, cb) {
    this.events_ = this.events_ || {}
    if (event in this.events_ === false) return
    this.events_[event].splice(this.events_[event].indexOf(cb), 1)
  }

  trigger (event, ...args) {
    this.events_ = this.events_ || {}
    if (event in this.events_ === false) return
    for (let i = 0; i < this.events_[event].length; i++) {
      this.events_[event][i].apply(
        this,
        args
      )
    }
  }
}

export class ArrayEmitter extends EventEmitter {
  constructor () {
    super()
    this.array = []
  }

  push (...items) {
    const rVal = this.array.push(...items)
    this.trigger('change')
    return rVal
  }

  empty () {
    this.array.length = 0
    this.trigger('change')
  }

  remove (item) {
    const index = this.array.indexOf(item)

    if (index > -1) {
      this.array.splice(index, 1)
      this.trigger('change')
      return true
    }
    return false
  }
}