public function render()
{
parent::render();
$o = ZXmlUtil::renderArray(array(0 => 'grid', 1 => array('flex' => $this->flex, 'id' => $this->id)), true);
$o .= '<columns>';
for ($i = 0; $i < $this->columns; ++$i) {
$o .= ZXmlUtil::renderArray(array(0 => 'column', 1 => array('flex' => $this->flex)));
}
$o .= '</columns>';
$o .= '<rows>';
$childNum = 0;
foreach ($this->renderedChildren as $child) {
if (is_string($child) && trim($child) == '') {
continue;
}
if ($childNum == 0) {
$o .= '<row>';
}
$o .= $child;
if (++$childNum == $this->columns) {
$o .= '</row>';
$childNum = 0;
}
}
if ($childNum != 0) {
$o .= '</row>';
}
$o .= '</rows>';
$o .= '</grid>';
return $o;
}
