Issue #2975996 by mike82, Jaypan: Allow choosing the view mode for the Private...

Issue #2975996 by mike82, Jaypan: Allow choosing the view mode for the Private Message Messages formatter

config/schema/private_message.schema.yml

@@ -51,6 +51,9 @@ field.formatter.settings.private_message_thread_message_formatter:
     ajax_refresh_rate:
       type: integer
       label: 'The number of seconds between ajax checks for new messages'
+    view_mode:
+      type: string
+      label: 'The view mode used to render private messages'
 
 field.widget.settings.private_message_thread_member_widget:
   type: mapping

src/Plugin/Field/FieldFormatter/PrivateMessageThreadMessageFormatter.php

@@ -132,6 +132,7 @@ class PrivateMessageThreadMessageFormatter extends FormatterBase implements Cont
       'ajax_previous_load_count' => 5,
       'message_order' => 'asc',
       'ajax_refresh_rate' => 20,
+      'view_mode' => 'default',
     ] + parent::defaultSettings();
   }
 
@@ -142,7 +143,7 @@ class PrivateMessageThreadMessageFormatter extends FormatterBase implements Cont
     $summary = [];
     $settings = $this->getSettings();
 
-    $summary['thread_count'] = $this->t('Number of messages to show on load: @count', ['@count' => $settings['message_count']]);
+    $summary['message_count'] = $this->t('Number of threads to show on load: @count', ['@count' => $settings['message_count']]);
     $summary['ajax_previous_load_count'] = $this->t('Number of threads to show when clicking load previous: @count', ['@count' => $settings['ajax_previous_load_count']]);
     $summary['message_order'] = $this->t('Order of messages: @order', ['@order' => $this->translateKey('order', $settings['message_order'])]);
     if ($settings['ajax_refresh_rate']) {
@@ -152,6 +153,8 @@ class PrivateMessageThreadMessageFormatter extends FormatterBase implements Cont
       $summary['ajax_refresh_rate'] = $this->t('Ajax refresh rate: Ajax refresh disabled');
     }
 
+    $summary['view_mode'] = $this->t('Private Message View Mode: @view_mode', ['@view_mode' => $settings['view_mode']]);
+
     return $summary;
   }
 
@@ -191,6 +194,14 @@ class PrivateMessageThreadMessageFormatter extends FormatterBase implements Cont
       '#default_value' => $this->getSetting('message_order'),
     ];
 
+    $view_modes = \Drupal::entityManager()->getViewModeOptions('private_message', TRUE);
+    $element['view_mode'] = [
+      '#type' => 'select',
+      '#title' => $this->t('Private Message view mode'),
+      '#options' => $view_modes,
+      '#default_value' => $this->getSetting('view_mode'),
+    ];
+
     return $element;
   }
 
@@ -214,7 +225,7 @@ class PrivateMessageThreadMessageFormatter extends FormatterBase implements Cont
     $messages = array_slice($messages, -1 * $this->getSetting('message_count'));
 
     foreach ($messages as $message) {
-      $element[$message->id()] = $view_builder->view($message, 'full');
+      $element[$message->id()] = $view_builder->view($message, $this->getSetting('view_mode'));
     }
 
     if ($this->getSetting('message_order') == 'desc') {