Events     

import { Events } from 'quasar'
Events.$on('app:visibility', state => {
  console.log('App became', state)
})

import { Events } from 'quasar'
Events.$on('some-event', (param1, param2) => {
  //...
})

import { Events } from 'quasar'
// Unregistering an event:
Events.$off('event-name')
// 'event-name' does no longer has any callbacks
// Unregistering a specific callback for an event:
let callback = function(...) {...}
Events.$on('event-name', callback)
Events.$off('event-name', callback)
// 'event-name' still exists (if other callbacks are registered to this event),
// but does not contain the above callback anymore

import { Events } from 'quasar'
let callback = function(...) {...}
Events.$once('event-name', callback)
// callback will be triggered only once

import { Events } from 'quasar'
Events.$emit('event-name')
// All callbacks associated with 'event-name' will be triggered
// in the order that they were registered.
// Trigger with parameters (as many as you want):
Events.$emit('event-name', {
  status: 10,
  message: 'wow',
  {obj: true}
)
// The parameters will be used when calling all registered
// callbacks for 'event-name' --> callback({status: 10, message: 'wow',...});