/**
* {@inheritdoc}
*/
public function preBuild(array &$build, ObjectInterface $context = NULL)
{
parent::preBuild($build, $context);
$layers = $this->getOption('layers', array());
$map_layers = $context->getObjects('layer');
// Only handle layers available in the map and configured in the control.
// Ensures maximum performance on client side while having maximum
// configuration flexibility.
$frontend_layers = array();
foreach ($map_layers as $map_layer) {
if (isset($layers[$map_layer->getMachineName()])) {
$frontend_layers[$map_layer->getMachineName()] = $map_layer->getMachineName();
}
}
// Don't name these "layers" otherwise Object::getJS() will delete the
// option from the JS array.
$this->setOption('frontend_layers', $frontend_layers);
}
