if (!class_exists('WP_List_Table'))

public function no_items()
{
    _e('Unfortunately there are no ingredients available :(', 'wp-my-recipe');
}
/**
 * Prepare the items for the table to process
 *
 * @return Void
 */
public function prepare_items($search = NULL)
{
    $data = $this->table_data($search);
    $columns = $this->get_columns();
    $hidden = $this->get_hidden_columns();
    $sortable = $this->get_sortable_columns();
    $perPage = 1;
    $currentPage = $this->get_pagenum();
    if (!is_null($data))
    {
        $totalItems = count($data);
        $data = array_slice($data, (($currentPage - 1) * $perPage) , $perPage);
    }
    else
    {
        $totalItems = 0;
    }
    $this->set_pagination_args(array(
        'total_items' => $totalItems,
        'per_page' => $perPage
    ));
    $this->_column_headers = array(
        $columns,
        $hidden,
        $sortable
    );
    $this->items = $this->table_data($search);
}
/**
 * Override the parent columns method. Defines the columns to use in your listing table
 *
 * @return Array
 */
public function get_columns()
{
    $columns = array(
        'cb' => '<input type="checkbox" />', // to display the checkbox.
        'id' => 'ID',
        'name' => __('Ingredient name', 'wp-my-recipe') ,
        'kcalories' => __('Kilocalories per 100 ml/mg', 'wp-my-recipe') ,
        'reference' => __('Reference value', 'wp-my-recipe')
    );
    return $columns;
}
/**
 * Define which columns are hidden
 *
 * @return Array
 */
public function get_hidden_columns()
{
    return array(
        'id'
    );
}
/**
 * Define the sortable columns
 *
 * @return Array
 */
public function get_sortable_columns()
{
    return array(
        'name' => array(
            'name',
            false
        ) ,
        'kcalories' => array(
            'kcalories',
            false
        ) ,
        'reference' => array(
            'reference',
            false
        ) ,
    );
}
/**
 * Get the table data
 *
 * @return Array
 */
function table_data($search = NULL)
{

    //todo add real search
    if ($search != NULL)
    {
        $search = trim($search);
        $data = array(
            ['id' => 'dummyData',
            'name' => $search,
            'kcalories' => 'dummyData',
            'reference' => 'dummyData']
        );
    }
    else
    {
        $data = s_getAllIngredients();
    }

    return $data;
}
/**
 * Define what data to show on each column of the table
 *
 * @param  Array $item        Data
 * @param  String $column_name - Current column name
 *
 * @return Mixed
 */
public function column_default($item, $column_name)
{
    switch ($column_name)
    {
        case 'id':
        case 'name':
        case 'kcalories':
        case 'reference':
            return $item[$column_name];
        default:
            return print_r($item, true);
    }
}
// /**
//  * Allows you to sort the data by the variables set in the $_GET
//  *
//  * @return Mixed
//  */
private function sort_data($a, $b)
{

    // Set defaults
    $orderby = 'name';
    $order = 'asc';
    // If orderby is set, use this as the sort column
    if (!empty($_GET['orderby']))
    {
        $orderby = $_GET['orderby'];
    }
    // If order is set use this as the order
    if (!empty($_GET['order']))
    {
        $order = $_GET['order'];
    }
    $result = strcmp($a[$orderby], $b[$orderby]);
    if ($order === 'asc')
    {
        return $result;
    }
    return -$result;

}

protected function column_cb($item)
{
    return sprintf('<label class="screen-reader-text" for="ingredient_' . $item['id'] . '">' . sprintf(__('Select %s') , $item['name']) . '</label>' . "<input type='checkbox' name='ingredient[]' id='ingredient_{$item['id']}' value='{$item['id']}' />");
}