silverstripe-framework/src/Forms/SingleLookupField.php

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<?php
namespace SilverStripe\Forms;
use SilverStripe\Core\Convert;
use SilverStripe\ORM\DataObjectInterface;
use SilverStripe\ORM\Map;
use SilverStripe\ORM\FieldType\DBField;
/**
* Read-only complement of {@link DropdownField}.
*
* Shows the "human value" of the dropdown field for the currently selected
* value.
*/
class SingleLookupField extends SingleSelectField
{
/**
* @var bool
*/
protected $readonly = true;
/**
* @return mixed|null
*/
protected function valueToLabel()
{
$value = $this->value;
$source = $this->getSource();
$source = ($source instanceof Map) ? $source->toArray() : $source;
if (array_key_exists($value, $source)) {
return $source[$value];
}
return null;
}
/**
* Ignore validation as the field is readonly
*
* @param Validator $validator
* @return bool
*/
public function validate($validator)
{
return true;
}
/**
* Stubbed so invalid data doesn't save into the DB
*
* @param DataObjectInterface $record DataObject to save data into
*/
public function saveInto(DataObjectInterface $record)
{
}
/**
* @return SingleLookupField
*/
public function performReadonlyTransformation()
{
$clone = clone $this;
return $clone;
}
/**
* @return bool
*/
public function getHasEmptyDefault()
{
return false;
}
/**
* @return string
*/
public function Type()
{
return 'single-lookup readonly';
}
/**
* Note: we need to transform value in here becaue React fields do not use Field() to display value
*
* @return mixed
*/
public function Value()
{
$label = $this->valueToLabel();
if (!is_null($label)) {
return $label;
}
return $value;
}
/**
* @return string
*/
public function getTemplate()
{
// this field uses the same default template as LookupField
return parent::getTemplate() ?: LookupField::class;
}
/**
* Returns a readonly span containing the correct value.
*
* @param array $properties
*
* @return string
*/
public function Field($properties = [])
{
$label = $this->valueToLabel();
if (!is_null($label)) {
$attrValue = Convert::raw2xml($label);
$inputValue = $this->value;
} else {
$attrValue = '<i>(' . _t('SilverStripe\\Forms\\FormField.NONE', 'none') . ')</i>';
$inputValue = '';
}
$properties = array_merge($properties, array(
'AttrValue' => DBField::create_field('HTMLFragment', $attrValue),
'InputValue' => $inputValue
));
return parent::Field($properties);
}
}