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<?php
namespace Illuminate\View\Concerns;
use Closure;
use Illuminate\Contracts\View\View as ViewContract;
use Illuminate\Support\Str;
trait ManagesEvents
{
/**
* Register a view creator event.
*
* @param array|string $views
* @param \Closure|string $callback
* @return array
*/
public function creator($views, $callback)
{
$creators = [];
foreach ((array) $views as $view) {
$creators[] = $this->addViewEvent($view, $callback, 'creating: ');
}
return $creators;
}
/**
* Register multiple view composers via an array.
*
* @param array $composers
* @return array
*/
public function composers(array $composers)
{
$registered = [];
foreach ($composers as $callback => $views) {
$registered = array_merge($registered, $this->composer($views, $callback));
}
return $registered;
}
/**
* Register a view composer event.
*
* @param array|string $views
* @param \Closure|string $callback
* @return array
*/
public function composer($views, $callback)
{
$composers = [];
foreach ((array) $views as $view) {
$composers[] = $this->addViewEvent($view, $callback);
}
return $composers;
}
/**
* Add an event for a given view.
*
* @param string $view
* @param \Closure|string $callback
* @param string $prefix
* @return \Closure|null
*/
protected function addViewEvent($view, $callback, $prefix = 'composing: ')
{
$view = $this->normalizeName($view);
if ($callback instanceof Closure) {
$this->addEventListener($prefix.$view, $callback);
return $callback;
} elseif (is_string($callback)) {
return $this->addClassEvent($view, $callback, $prefix);
}
}
/**
* Register a class based view composer.
*
* @param string $view
* @param string $class
* @param string $prefix
* @return \Closure
*/
protected function addClassEvent($view, $class, $prefix)
{
$name = $prefix.$view;
// When registering a class based view "composer", we will simply resolve the
// classes from the application IoC container then call the compose method
// on the instance. This allows for convenient, testable view composers.
$callback = $this->buildClassEventCallback(
$class, $prefix
);
$this->addEventListener($name, $callback);
return $callback;
}
/**
* Build a class based container callback Closure.
*
* @param string $class
* @param string $prefix
* @return \Closure
*/
protected function buildClassEventCallback($class, $prefix)
{
[$class, $method] = $this->parseClassEvent($class, $prefix);
// Once we have the class and method name, we can build the Closure to resolve
// the instance out of the IoC container and call the method on it with the
// given arguments that are passed to the Closure as the composer's data.
return function () use ($class, $method) {
return $this->container->make($class)->{$method}(...func_get_args());
};
}
/**
* Parse a class based composer name.
*
* @param string $class
* @param string $prefix
* @return array
*/
protected function parseClassEvent($class, $prefix)
{
return Str::parseCallback($class, $this->classEventMethodForPrefix($prefix));
}
/**
* Determine the class event method based on the given prefix.
*
* @param string $prefix
* @return string
*/
protected function classEventMethodForPrefix($prefix)
{
return str_contains($prefix, 'composing') ? 'compose' : 'create';
}
/**
* Add a listener to the event dispatcher.
*
* @param string $name
* @param \Closure $callback
* @return void
*/
protected function addEventListener($name, $callback)
{
if (str_contains($name, '*')) {
$callback = function ($name, array $data) use ($callback) {
return $callback($data[0]);
};
}
$this->events->listen($name, $callback);
}
/**
* Call the composer for a given view.
*
* @param \Illuminate\Contracts\View\View $view
* @return void
*/
public function callComposer(ViewContract $view)
{
$this->events->dispatch('composing: '.$view->name(), [$view]);
}
/**
* Call the creator for a given view.
*
* @param \Illuminate\Contracts\View\View $view
* @return void
*/
public function callCreator(ViewContract $view)
{
$this->events->dispatch('creating: '.$view->name(), [$view]);
}
}
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