function prepare_items()
{
// number of items per page
$per_page = 10;
// define column headers
$columns = $this->get_columns();
$hidden = array();
$sortable = $this->get_sortable_columns();
$this->_column_headers = array($columns, $hidden, $sortable);
// retrieve data
// TODO select data for current page only
$data = \Podlove\Model\Show::all();
// get current page
$current_page = $this->get_pagenum();
// get total items
$total_items = count($data);
// extrage page for current page only
$data = array_slice($data, ($current_page - 1) * $per_page, $per_page);
// add items to table
$this->items = $data;
// register pagination options & calculations
$this->set_pagination_args(array('total_items' => $total_items, 'per_page' => $per_page, 'total_pages' => ceil($total_items / $per_page)));
}
