frames.php
public function getBaseUrl()
    {
        if (is_integer($this->focus)) {
            $url = $this->frames[$this->focus]->getBaseUrl();
        } else {
            $url = $this->frameset->getBaseUrl();
        }

        return $url;
    }
public function getBaseUrl()
    {
        if (is_integer($this->focus)) {
            $url = $this->frames[$this->focus]->getBaseUrl();
        } else {
            $url = $this->frameset->getBaseUrl();
        }

        return $url;
    }
Page base URL.

@return SimpleUrl        Current url.