ProcessAvailableActionsViewHelper.php

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<?php
namespace TYPO3\CMS\Extensionmanager\ViewHelpers;

class ProcessAvailableActionsViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Link\ActionViewHelper {

    const SIGNAL_ProcessActions = 'processActions';

    protected $signalSlotDispatcher;

    public function render($extension) {
        $html = $this->renderChildren();
        $actions = preg_split('#\\n\\s*#s', trim($html));

        $actions = $this->emitProcessActionsSignal($extension, $actions);

        return implode(' ', $actions);
    }

    protected function emitProcessActionsSignal($extension, array $actions) {
        $this->signalSlotDispatcher->dispatch(
            __CLASS__,
            static::SIGNAL_ProcessActions,
            array(
                $extension,
                &$actions,
            )
        );
        return $actions;
    }

}