silverstripe-cms/code/Model/SiteTreeFileFormFactoryExtension.php

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<?php
namespace SilverStripe\CMS\Model;
use SilverStripe\Assets\File;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\ReadonlyField;
use SilverStripe\Forms\Tab;
use SilverStripe\Forms\TabSet;
use SilverStripe\ORM\DataExtension;
use SilverStripe\ORM\FieldType\DBHTMLText;
/**
* Extension applied to {@see FileFormFactory} to decorate with a "Used on:" information area.
* Uses tracking provided by {@see SiteTreeFileExtension} to generate this.
*
* @property File $owner
*/
class SiteTreeFileFormFactoryExtension extends DataExtension
{
public function updateFormFields(FieldList $fields, $controller, $formName, $context)
{
// Create field
/** @var File|SiteTreeFileExtension $record */
$record = $context['Record'];
$usedOnField = ReadonlyField::create(
'BackLinkCount',
_t(__CLASS__.'.BACKLINKCOUNT', 'Used on:'),
$record->BackLinkTrackingCount() . ' ' . _t(__CLASS__.'.PAGES', 'page(s)')
)
->addExtraClass('cms-description-toggle');
// Add table
/** @var DBHTMLText $backlinkHTML */
$backlinkHTML = $record->BackLinkHTMLList();
if (trim($backlinkHTML->forTemplate())) {
$usedOnField->setDescription($backlinkHTML);
}
/** @var TabSet $tabset */
$tabset = $fields->fieldByName('Editor');
if ($tabset) {
// Add field to new tab
/** @var Tab $tab */
$tab = Tab::create('Usage', _t(__CLASS__.'.USAGE', 'Usage'), $usedOnField);
$tabset->push($tab);
}
}
}