293 lines
7.3 KiB
PHP
293 lines
7.3 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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* $field = new DropdownField('GalleryID', 'Gallery', Gallery::get()->map('ID', 'Title'));
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* $field->setEmptyString('(Select one)');
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* $fields->addFieldToTab('Root.Content', $field, '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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* Example 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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* <b>Disabling individual items</b>
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*
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* Individual items can be disabled by feeding their array keys to setDisabledItems.
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*
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* <code>
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* $DrDownField->setDisabledItems( array( 'US', 'GEM' ) );
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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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/**
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* @var Array $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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* @var array $disabledItems The keys for items that should be disabled (greyed out) in the dropdown
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*/
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protected $disabledItems = array();
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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 $source}-Array (can also be boolean, which
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* results in an empty string). Argument is deprecated in 3.1, please use
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* {@link setEmptyString()} and/or {@link setHasEmptyDefault(true)} instead.
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*/
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public function __construct($name, $title=null, $source=array(), $value='', $form=null, $emptyString=null) {
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$this->setSource($source);
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if($emptyString === true) {
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Deprecation::notice('3.1',
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'Please use setHasEmptyDefault(true) instead of passing a boolean true $emptyString argument',
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Deprecation::SCOPE_GLOBAL);
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}
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if(is_string($emptyString)) {
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Deprecation::notice('3.1', 'Please use setEmptyString() instead of passing a string emptyString argument.',
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Deprecation::SCOPE_GLOBAL);
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}
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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, $form);
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}
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public function Field($properties = array()) {
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$source = $this->getSource();
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$options = array();
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if ($this->getHasEmptyDefault()) {
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$selected = ($this->value === '' || $this->value === null);
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$disabled = (in_array('', $this->disabledItems, true)) ? 'disabled' : false;
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$options[] = new ArrayData(array(
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'Value' => '',
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'Title' => $this->getEmptyString(),
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'Selected' => $selected,
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'Disabled' => $disabled
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));
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}
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if ($source) {
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foreach($source as $value => $title) {
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// check against value, fallback to a type check comparison when !value
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$selected = ($value) ? ($value == $this->value) : ($value === $this->value);
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$disabled = (in_array($value, $this->disabledItems, true)) ? 'disabled' : false;
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$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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'Disabled' => $disabled,
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));
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}
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}
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$properties = array_merge($properties, array(
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'Options' => new ArrayList($options)
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));
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return parent::Field($properties);
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}
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/**
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* Mark certain elements as disabled, regardless of the
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* {@link setDisabled()} settings.
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*
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* @param array $items Collection of array keys, as defined in the $source array
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*/
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public function setDisabledItems($items) {
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$this->disabledItems = $items;
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return $this;
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}
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/**
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* @return array
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*/
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public function getDisabledItems() {
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return $this->disabledItems;
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}
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/**
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* @return array
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*/
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public function getAttributes() {
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return array_merge(
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parent::getAttributes(),
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array(
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'type' => null,
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'value' => null
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)
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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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public 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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public function getSource() {
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return $this->source;
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}
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/**
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* @param array $source
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*/
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public function setSource($source) {
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$this->source = $source;
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return $this;
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}
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/**
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* @param boolean $bool
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*/
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public function setHasEmptyDefault($bool) {
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$this->hasEmptyDefault = $bool;
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return $this;
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}
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/**
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* @return boolean
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*/
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public 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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*
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* Defaults to an empty string. Automatically sets {@link $hasEmptyDefault}
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* to true.
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*
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* @param string $str
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*/
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public function setEmptyString($str) {
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$this->setHasEmptyDefault(true);
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$this->emptyString = $str;
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return $this;
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}
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/**
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* @return string
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*/
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public function getEmptyString() {
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return $this->emptyString;
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}
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/**
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* @return LookupField
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*/
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public function performReadonlyTransformation() {
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$field = $this->castedCopy('LookupField');
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$field->setSource($this->getSource());
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$field->setReadonly(true);
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return $field;
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}
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}
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