ColorFieldItem.php

<?php


/**
 * @file
 * Contains Drupal\color_field\Plugin\Field\FieldType\ColorFieldItem.
 */
namespace Drupal\color_field\Plugin\Field\FieldType;

use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemBase;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\TypedData\DataDefinition;

/**
 * Plugin implementation of the 'color_field' field type.
 *
 * @FieldType(
 *   id = "color_field",
 *   label = @Translation("Color"),
 *   description = @Translation("Create and store Color value."),
 *   default_widget = "color_field_default",
 *   default_formatter = "color_field_text"
 * )
 */
class ColorFieldItem extends FieldItemBase {
    
    /**
     * {@inheritdoc}
     */
    public static function schema(FieldStorageDefinitionInterface $field_definition) {
        return array(
            'columns' => array(
                'color' => array(
                    'description' => 'The RGB hex values',
                    'type' => 'varchar',
                    'length' => 7,
                    'not null' => FALSE,
                ),
                'opacity' => array(
                    'description' => 'The opacity/alphavalue property',
                    'type' => 'float',
                    'size' => 'tiny',
                    'not null' => FALSE,
                ),
            ),
            'indexes' => array(
                'color' => array(
                    'color',
                ),
            ),
        );
    }
    
    /**
     * {@inheritdoc}
     */
    public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
        $properties['color'] = DataDefinition::create('string')->setLabel(t('Color'));
        $properties['opacity'] = DataDefinition::create('float')->setLabel(t('Opacity'));
        return $properties;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isEmpty() {
        $value = $this->get('color')
            ->getValue();
        return $value === NULL || $value === '';
    }
    
    /**
     * {@inheritdoc}
     */
    public function fieldSettingsForm(array $form, FormStateInterface $form_state) {
        $element = array();
        $element['opacity'] = array(
            '#type' => 'checkbox',
            '#title' => t('Record opacity'),
            '#default_value' => $this->getSetting('opacity'),
        );
        return $element;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
        return '';
    }

}