Filtered files in fluent (SS3)

FluentFileFilteredExtension.php

<?php

/**
 * Allow filtering files per locale
 */
class FluentFileFilteredExtension extends FluentFilteredExtension
{
    public function canViewInLocale($locale = null)
    {
        if ($this->isFolder()) {
            return true;
        }

        return parent::canViewInLocale($locale);
    }

    public function updateCMSFields(FieldList $fields)
    {
        // Don't add the filter checkboxes to folders
        if ($this->isFolder()) {
            return;
        }

        parent::updateCMSFields($fields);
    }

    public function augmentSQL(SQLQuery &$query, DataQuery &$dataQuery = null)
    {
        // Disable filtering on folders
        if ($this->isFolder()) {
            return;
        }

        // Generally disable filtering of files in the backend!
        if (!Fluent::is_frontend()) {
            return;
        }

        parent::augmentSQL($query, $dataQuery);
    }

    private function isFolder()
    {
        return $this->ownerBaseClass == 'Folder' || $this->owner instanceof Folder;
    }
}