Sculpin\Contrib\ProxySourceCollection\ProxySourceCollectionDataProvider::beforeRunPost PHP Method

    public function beforeRunPost(SourceSetEvent $sourceSetEvent)
    {
        $anItemHasChanged = false;
        foreach ($this->collection as $item) {
            if ($item->hasChanged()) {
                $anItemHasChanged = true;
                $this->collection->init();
                break;
            }
        }
        if ($anItemHasChanged) {
            foreach ($sourceSetEvent->allSources() as $source) {
                if ($source->data()->get('use') && in_array($this->dataProviderName, $source->data()->get('use'))) {
                    $source->forceReprocess();
                }
            }
        }
        foreach ($this->collection as $item) {
            $item->data()->set('next_' . $this->dataSingularName, $item->nextItem());
            $item->data()->set('previous_' . $this->dataSingularName, $item->previousItem());
        }
    }