react-reflex/src/lib/ReflexEvents.js

Flex layout component for advanced React web applications

///////////////////////////////////////////////////////////
// ReflexEvents
// By Philippe Leefsma
// December 2016
//
///////////////////////////////////////////////////////////
class ReflexEvents {

  constructor () {

    this._events = {}
  }

  /////////////////////////////////////////////////////////
  // Supports multiple events space-separated
  //
  /////////////////////////////////////////////////////////
  on (events, fct) {

    events.split(' ').forEach((event) => {

      this._events[event] = this._events[event]	|| []
      this._events[event].push(fct)
    })

    return this
  }

  /////////////////////////////////////////////////////////
  // Supports multiple events space-separated
  //
  /////////////////////////////////////////////////////////
  off (events, fct) {

    if (events == undefined) {

      this._events = {}
      return
    }

    events.split(' ').forEach((event) => {

      if (event in this._events === false)
        return;

      if (fct) {

        this._events[event].splice(
          this._events[event].indexOf(fct), 1)

      } else {

        this._events[event] = []
      }
    })

    return this
  }

  emit (event /* , args... */) {

    if(this._events[event] === undefined)
      return;

    var tmpArray = this._events[event].slice()

    for(var i = 0; i < tmpArray.length; ++i) {

      var result	= tmpArray[i].apply(this,
        Array.prototype.slice.call(arguments, 1))

      if(result !== undefined) {

        return result
      }
    }

    return undefined
  }
}

export default ReflexEvents