/**
* Renders the header cell content. The default implementation simply renders [[header]]. This method may be
* overridden to customize the rendering of the header cell.
*
* @return string the rendering result
*/
protected function renderHeaderCellContent()
{
if ($this->header !== null) {
return parent::renderHeaderCellContent();
}
$icon = $this->expandIcon;
$css = 'kv-expand-header-icon kv-state-collapsed';
if ($this->defaultHeaderState === GridView::ROW_EXPANDED) {
$icon = $this->collapseIcon;
$css = 'kv-expand-header-icon kv-state-expanded';
}
return "<div class='{$css}'>{$icon}</div>";
}
