silverstripe-framework/ORM/Versioning/VersionedGridFieldDetailForm.php

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<?php
namespace SilverStripe\ORM\Versioning;
use SilverStripe\Control\RequestHandler;
use SilverStripe\Core\Extension;
use SilverStripe\Forms\GridField\GridField;
use SilverStripe\ORM\DataObject;
/**
* Extends {@see GridFieldDetailForm}
*/
class VersionedGridFieldDetailForm extends Extension {
/**
* @param string $class
* @param GridField $gridField
* @param DataObject $record
* @param RequestHandler $requestHandler
*/
public function updateItemRequestClass(&$class, $gridField, $record, $requestHandler) {
// Conditionally use a versioned item handler
if($record && $record->has_extension('SilverStripe\ORM\Versioning\Versioned')) {
$class = 'SilverStripe\ORM\Versioning\VersionedGridFieldItemRequest';
}
}
}