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<?php
namespace ipl\Stdlib;
use Evenement\EventEmitterTrait;
use InvalidArgumentException;
trait Events
{
use EventEmitterTrait {
EventEmitterTrait::on as private evenementUnvalidatedOn;
}
/** @var array */
protected $eventsEmittedOnce = [];
/**
* @param string $event
* @param array $arguments
*/
protected function emitOnce($event, array $arguments = [])
{
if (! isset($this->eventsEmittedOnce[$event])) {
$this->eventsEmittedOnce[$event] = true;
$this->emit($event, $arguments);
}
}
/**
* @param string $event
* @param callable $listener
* @return $this
*/
public function on($event, callable $listener)
{
$this->assertValidEvent($event);
$this->evenementUnvalidatedOn($event, $listener);
return $this;
}
protected function assertValidEvent($event)
{
if (! $this->isValidEvent($event)) {
throw new InvalidArgumentException("$event is not a valid event");
}
}
/**
* @param string $event
* @return bool
*/
public function isValidEvent($event)
{
return true;
}
}
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