ColorFieldWidgetDefault.php

<?php

declare (strict_types=1);
namespace Drupal\color_field\Plugin\Field\FieldWidget;

use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Form\FormStateInterface;

/**
 * Plugin implementation of the color_widget default input widget.
 *
 * @FieldWidget(
 *   id = "color_field_widget_default",
 *   module = "color_field",
 *   label = @Translation("Color default"),
 *   field_types = {
 *     "color_field_type"
 *   }
 * )
 */
class ColorFieldWidgetDefault extends ColorFieldWidgetBase {
    
    /**
     * {@inheritdoc}
     */
    public function settingsForm(array $form, FormStateInterface $form_state) : array {
        $element = [];
        $element['placeholder_color'] = [
            '#type' => 'textfield',
            '#title' => $this->t('Color placeholder'),
            '#default_value' => $this->getSetting('placeholder_color'),
            '#description' => $this->t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
        ];
        $element['placeholder_opacity'] = [
            '#type' => 'textfield',
            '#title' => $this->t('Opacity placeholder'),
            '#default_value' => $this->getSetting('placeholder_opacity'),
            '#description' => $this->t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
        ];
        return $element;
    }
    
    /**
     * {@inheritdoc}
     */
    public function settingsSummary() : array {
        $summary = [];
        $placeholder_color = $this->getSetting('placeholder_color');
        $placeholder_opacity = $this->getSetting('placeholder_opacity');
        if (!empty($placeholder_color)) {
            $summary[] = $this->t('Color placeholder: @placeholder_color', [
                '@placeholder_color' => $placeholder_color,
            ]);
        }
        if (!empty($placeholder_opacity)) {
            $summary[] = $this->t('Opacity placeholder: @placeholder_opacity', [
                '@placeholder_opacity' => $placeholder_opacity,
            ]);
        }
        if (empty($summary)) {
            $summary[] = $this->t('No placeholder');
        }
        return $summary;
    }
    
    /**
     * {@inheritdoc}
     */
    public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) : array {
        $element = parent::formElement($items, $delta, $element, $form, $form_state);
        $element['color']['#placeholder'] = $this->getSetting('placeholder_color');
        if ($this->getFieldSetting('opacity')) {
            $element['opacity']['#placeholder'] = $this->getSetting('placeholder_opacity');
        }
        return $element;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function defaultSettings() : array {
        return [
            'placeholder_color' => '',
            'placeholder_opacity' => '',
        ] + parent::defaultSettings();
    }

}