fix a number of issue with annotation

color_field.module

@@ -4,8 +4,6 @@
  * An color field with a custom color picker using the Field Types API.
  */
 
-use Drupal\Core\Entity\EntityInterface;
-
 /**
  * Implements hook_help().
  */
@@ -24,7 +22,6 @@ function color_field_help($path, $arg) {
  */
 function color_field_field_instance_settings_form($field, $instance) {
   $settings = $instance['settings'];
-
   $form['alfa'] = array(
     '#type' => 'checkbox',
     '#title' => t('Alfa'),

lib/Drupal/color_field/Plugin/Field/FieldType/ColorFieldType.php → lib/Drupal/color_field/Plugin/Field/FieldType/ColorFieldItem.php

@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Contains \Drupal\color_field\Plugin\Field\FieldType\ColorFieldType.
+ * Contains \Drupal\color_field\Plugin\Field\FieldType\ColorFieldItem.
  */
 
 namespace Drupal\color_field\Plugin\Field\FieldType;

lib/Drupal/color_field/Plugin/Field/FieldWidget/ColorFieldDefaultWidget.php

@@ -13,7 +13,7 @@ use Drupal\Core\Field\WidgetBase;
 /**
  * Plugin implementation of the 'color_field_default' widget.
  *
- * @Plugin(
+ * @FieldWidget(
  *   id = "color_field_default",
  *   module = "color_field",
  *   label = @Translation("Color field default"),
@@ -31,22 +31,13 @@ class ColorFieldDefaultWidget extends WidgetBase {
    * Implements \Drupal\field\Plugin\Type\Widget\WidgetInterface::formElement().
    */
   public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, array &$form_state) {
-    $element['rgb'] = $element + array(
-      '#type' => 'textfield',
-      '#maxlength' => 7,
+    $element['rgb'] = array(
       '#title' => t('Color Field'),
-      '#default_value' => isset($items[$delta]['rgb']) ? $items[$delta]['rgb'] : NULL,
-      //'#placeholder' => $this->getSetting('placeholder'),
-      '#required' => $element['#required'],
-    );
-    /*$element['alfa'] = $element + array(
       '#type' => 'textfield',
       '#maxlength' => 7,
-      '#title' => t('Color Field'),
-      '#default_value' => isset($items[$delta]['alfa']) ? $items[$delta]['alfa'] : NULL,
-      //'#placeholder' => $this->getSetting('placeholder'),
       '#required' => $element['#required'],
-    );*/
+      '#default_value' => isset($items[$delta]->rgb) ? $items[$delta]->rgb : NULL,
+    );
     return $element;
   }