mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-08-26 12:36:07 +02:00
246 lines
6.3 KiB
PHP
246 lines
6.3 KiB
PHP
<?php
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/**
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* Dropdown field, created from a <select> tag.
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*
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* <b>Setting a $has_one relation</b>
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*
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* Using here an example of an art gallery, with Exhibition pages,
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* each of which has a Gallery they belong to. The Gallery class is also user-defined.
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* <code>
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* static $has_one = array(
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* 'Gallery' => 'Gallery',
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* );
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*
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* public function getCMSFields() {
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* $fields = parent::getCMSFields();
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* $galleries = DataObject::get('Gallery');
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* if ($galleries) {
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* $galleries = $galleries->toDropdownMap('ID', 'Title', '(Select one)', true);
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* }
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* $fields->addFieldToTab('Root.Content', new DropdownField('GalleryID', 'Gallery', $galleries), 'Content');
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* </code>
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*
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* As you see, you need to put "GalleryID", rather than "Gallery" here.
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*
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* <b>Populate with Array</b>
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*
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* Example model defintion:
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* <code>
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* class MyObject extends DataObject {
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* static $db = array(
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* 'Country' => "Varchar(100)"
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* );
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* }
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* </code>
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*
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* Exampe instantiation:
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* <code>
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* new DropdownField(
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* 'Country',
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* 'Country',
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* array(
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* 'NZ' => 'New Zealand',
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* 'US' => 'United States'
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* 'GEM'=> 'Germany'
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* )
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* );
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* </code>
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*
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* <b>Populate with Enum-Values</b>
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*
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* You can automatically create a map of possible values from an {@link Enum} database column.
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*
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* Example model definition:
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* <code>
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* class MyObject extends DataObject {
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* static $db = array(
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* 'Country' => "Enum('New Zealand,United States,Germany','New Zealand')"
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* );
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* }
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* </code>
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*
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* Field construction:
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* <code>
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* new DropdownField(
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* 'Country',
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* 'Country',
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* singleton('MyObject')->dbObject('Country')->enumValues()
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* );
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* </code>
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*
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* @see CheckboxSetField for multiple selections through checkboxes instead.
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* @see ListboxField for a single <select> box (with single or multiple selections).
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* @see TreeDropdownField for a rich and customizeable UI that can visualize a tree of selectable elements
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*
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* @package forms
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* @subpackage fields-basic
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*/
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class DropdownField extends FormField {
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protected $template = 'DropdownField';
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/**
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* @var boolean $source Associative or numeric array of all dropdown items,
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* with array key as the submitted field value, and the array value as a
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* natural language description shown in the interface element.
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*/
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protected $source;
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/**
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* @var boolean $isSelected Determines if the field was selected
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* at the time it was rendered, so if {@link $value} matches on of the array
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* values specified in {@link $source}
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*/
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protected $isSelected;
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/**
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* @var boolean $hasEmptyDefault Show the first <option> element as
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* empty (not having a value), with an optional label defined through
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* {@link $emptyString}. By default, the <select> element will be
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* rendered with the first option from {@link $source} selected.
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*/
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protected $hasEmptyDefault = false;
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/**
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* @var string $emptyString The title shown for an empty default selection,
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* e.g. "Select...".
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*/
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protected $emptyString = '';
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/**
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* Creates a new dropdown field.
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* @param $name The field name
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* @param $title The field title
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* @param $source An map of the dropdown items
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* @param $value The current value
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* @param $form The parent form
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* @param $emptyString mixed Add an empty selection on to of the {@link $source}-Array
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* (can also be boolean, which results in an empty string)
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* Argument is deprecated in 2.3, please use {@link setHasEmptyDefault()} and {@link setEmptyString()} instead.
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*/
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function __construct($name, $title = null, $source = array(), $value = "", $form = null, $emptyString = null) {
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$this->setSource($source);
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if($emptyString) $this->setHasEmptyDefault(true);
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if(is_string($emptyString)) $this->setEmptyString($emptyString);
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parent::__construct($name, ($title===null) ? $name : $title, $value, $form);
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}
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function Field($properties = array()) {
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$source = $this->getSource();
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$options = array();
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if($source) {
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// SQLMap needs this to add an empty value to the options
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if(is_object($source) && $this->emptyString) {
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$options[] = new ArrayData(array(
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'Value' => $this->emptyString,
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'Title' => '',
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));
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}
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foreach($source as $value => $title) {
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$selected = false;
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if($value === '' && ($this->value === '' || $this->value === null)) {
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$selected = true;
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} else {
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// check against value, fallback to a type check comparison when !value
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$selected = ($value) ? $value == $this->value : $value === $this->value;
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$this->isSelected = $selected;
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}
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$options[] = new ArrayData(array(
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'Title' => $title,
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'Value' => $value,
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'Selected' => $selected,
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));
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}
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}
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$properties = array_merge($properties, array('Options' => new ArrayList($options)));
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return $this->customise($properties)->renderWith($this->getTemplate());
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}
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function getAttributes() {
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return array_merge(
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parent::getAttributes(),
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array('type' => null)
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);
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}
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/**
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* @return boolean
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*/
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function isSelected() {
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return $this->isSelected;
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}
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/**
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* Gets the source array including any empty default values.
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*
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* @return array
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*/
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function getSource() {
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if(is_array($this->source) && $this->getHasEmptyDefault()) {
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return array(""=>$this->emptyString) + (array)$this->source;
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} else {
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return $this->source;
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}
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}
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/**
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* @param array $source
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*/
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function setSource($source) {
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$this->source = $source;
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}
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/**
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* @param boolean $bool
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*/
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function setHasEmptyDefault($bool) {
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$this->hasEmptyDefault = $bool;
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}
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/**
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* @return boolean
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*/
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function getHasEmptyDefault() {
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return $this->hasEmptyDefault;
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}
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/**
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* Set the default selection label, e.g. "select...".
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* Defaults to an empty string. Automatically sets
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* {@link $hasEmptyDefault} to true.
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*
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* @param string $str
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*/
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function setEmptyString($str) {
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$this->setHasEmptyDefault(true);
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$this->emptyString = $str;
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}
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/**
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* @return string
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*/
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function getEmptyString() {
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return $this->emptyString;
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}
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function performReadonlyTransformation() {
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$field = new LookupField($this->name, $this->title, $this->source);
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$field->setValue($this->value);
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$field->setForm($this->form);
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$field->setReadonly(true);
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return $field;
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}
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/**
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* Set form being disabled
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*/
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function setDisabled($disabled = true) {
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$this->disabled = $disabled;
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}
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} |