Issue #2143653 by swentel, tstoeckler, yoroy | ifrik: Added Show default image on image field.

core/modules/image/src/Plugin/Field/FieldWidget/ImageWidget.php

@@ -10,6 +10,7 @@
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\file\Entity\File;
 use Drupal\file\Plugin\Field\FieldWidget\FileWidget;
 
 /**
@@ -135,6 +136,13 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
     $element['#alt_field'] = $field_settings['alt_field'];
     $element['#alt_field_required'] = $field_settings['alt_field_required'];
 
+    // Default image.
+    $default_image = $field_settings['default_image'];
+    if (empty($default_image['fid'])) {
+      $default_image = $this->fieldDefinition->getFieldStorageDefinition()->getSetting('default_image');
+    }
+    $element['#default_image'] = !empty($default_image['fid']) ? $default_image : array();
+
     return $element;
   }
 
@@ -177,6 +185,7 @@ public static function process($element, FormStateInterface $form_state, $form)
       }
 
       $element['preview'] = array(
+        '#weight' => -10,
         '#theme' => 'image_style',
         '#width' => $variables['width'],
         '#height' => $variables['height'],
@@ -195,6 +204,20 @@ public static function process($element, FormStateInterface $form_state, $form)
         '#value' => $variables['height'],
       );
     }
+    elseif (!empty($element['#default_image'])) {
+      $default_image = $element['#default_image'];
+      $file = File::load($default_image['fid']);
+      if (!empty($file)) {
+        $element['preview'] = array(
+          '#weight' => -10,
+          '#theme' => 'image_style',
+          '#width' => $default_image['width'],
+          '#height' => $default_image['height'],
+          '#style_name' => $element['#preview_image_style'],
+          '#uri' => $file->getFileUri(),
+        );
+      }
+    }
 
     // Add the additional alt and title fields.
     $element['alt'] = array(
@@ -204,7 +227,7 @@ public static function process($element, FormStateInterface $form_state, $form)
       '#description' => t('This text will be used by screen readers, search engines, or when the image cannot be loaded.'),
       // @see http://www.gawds.org/show.php?contentid=28
       '#maxlength' => 512,
-      '#weight' => -2,
+      '#weight' => -12,
       '#access' => (bool) $item['fids'] && $element['#alt_field'],
       '#element_validate' => $element['#alt_field_required'] == 1 ? array(array(get_called_class(), 'validateRequiredFields')) : array(),
     );
@@ -214,7 +237,7 @@ public static function process($element, FormStateInterface $form_state, $form)
       '#default_value' => isset($item['title']) ? $item['title'] : '',
       '#description' => t('The title is used as a tool tip when the user hovers the mouse over the image.'),
       '#maxlength' => 1024,
-      '#weight' => -1,
+      '#weight' => -11,
       '#access' => (bool) $item['fids'] && $element['#title_field'],
       '#element_validate' => $element['#title_field_required'] == 1 ? array(array(get_called_class(), 'validateRequiredFields')) : array(),
     );

core/modules/image/src/Tests/ImageFieldDefaultImagesTest.php

@@ -6,6 +6,7 @@
  */
 
 namespace Drupal\image\Tests;
+use Drupal\file\Entity\File;
 
 /**
  * Tests setting up default images both to the field and field instance.
@@ -245,6 +246,11 @@ public function testDefaultImages() {
       )
     );
 
+    // Confirm the default image is shown on the node form.
+    $file = File::load($default_images['instance_new']->id());
+    $this->drupalGet('node/add/article');
+    $this->assertRaw($file->getFilename());
+
     // Remove the instance default from articles.
     $instance->settings['default_image']['fid'] = 0;
     $instance->save();
@@ -282,6 +288,11 @@ public function testDefaultImages() {
     $non_image = $this->drupalGetTestFiles('text');
     $this->drupalPostForm(NULL, array('files[instance_settings_default_image_fid]' => drupal_realpath($non_image[0]->uri)), t("Upload"));
     $this->assertText(t('The specified file text-0.txt could not be uploaded. Only files with the following extensions are allowed: png gif jpg jpeg.'), 'Non-image file cannot be used as default image.');
+
+    // Confirm the default image is shown on the node form.
+    $file = File::load($default_images['field_new']->id());
+    $this->drupalGet('node/add/article');
+    $this->assertRaw($file->getFilename());
   }
 
   /**