How to get search form data in a ListView?


I'm using SugarCRM Community 6.5.20.

I'm extending a listview query for a custom module.

In the listview search form there is a multi-select dropdown, which I want to get its selected values everytime the listview is loaded.

I want to put a "if" condition to customize the query parameter only if the multi-select dropdown has certain option selected.

There is a way to get listview search fields and its selected values in the view.list.php?

Or the only way to get the data I need is through a Logic Hook?

There is my view.list.php with the custom query ($this->params):


class PP_Pedido_ProdutoViewList extends ViewList {
    function listViewProcess() {
        global $current_user;
        $this->params['custom_where'] = " AND pp_pedido_produto.status NOT IN ('f', 'c')";
        if (empty($_REQUEST['search_form_only']) || $_REQUEST['search_form_only'] == false) {
            $this->lv->setup($this->seed, 'include/ListView/ListViewGeneric.tpl', $this->where, $this->params);
            echo $this->lv->display();

Any help would be appreciated.