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1 <?php
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2
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3 namespace Drupal\node;
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4
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5 use Drupal\Core\Entity\EntityInterface;
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6 use Drupal\Core\Entity\EntityViewBuilder;
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7
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8 /**
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9 * View builder handler for nodes.
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10 */
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11 class NodeViewBuilder extends EntityViewBuilder {
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12
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13 /**
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14 * {@inheritdoc}
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15 */
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16 public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
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17 /** @var \Drupal\node\NodeInterface[] $entities */
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18 if (empty($entities)) {
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19 return;
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20 }
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21
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22 parent::buildComponents($build, $entities, $displays, $view_mode);
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23
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24 foreach ($entities as $id => $entity) {
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25 $bundle = $entity->bundle();
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26 $display = $displays[$bundle];
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27
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28 if ($display->getComponent('links')) {
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29 $build[$id]['links'] = [
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30 '#lazy_builder' => [
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31 get_called_class() . '::renderLinks', [
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32 $entity->id(),
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33 $view_mode,
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34 $entity->language()->getId(),
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35 !empty($entity->in_preview),
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36 $entity->isDefaultRevision() ? NULL : $entity->getLoadedRevisionId(),
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37 ],
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38 ],
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39 ];
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40 }
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41
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42 // Add Language field text element to node render array.
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43 if ($display->getComponent('langcode')) {
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44 $build[$id]['langcode'] = [
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45 '#type' => 'item',
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46 '#title' => t('Language'),
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47 '#markup' => $entity->language()->getName(),
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48 '#prefix' => '<div id="field-language-display">',
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49 '#suffix' => '</div>',
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50 ];
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51 }
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52 }
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53 }
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54
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55 /**
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56 * {@inheritdoc}
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57 */
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58 protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
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59 $defaults = parent::getBuildDefaults($entity, $view_mode);
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60
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61 // Don't cache nodes that are in 'preview' mode.
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62 if (isset($defaults['#cache']) && isset($entity->in_preview)) {
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63 unset($defaults['#cache']);
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64 }
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65
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66 return $defaults;
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67 }
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68
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69 /**
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70 * #lazy_builder callback; builds a node's links.
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71 *
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72 * @param string $node_entity_id
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73 * The node entity ID.
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74 * @param string $view_mode
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75 * The view mode in which the node entity is being viewed.
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76 * @param string $langcode
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77 * The language in which the node entity is being viewed.
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78 * @param bool $is_in_preview
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79 * Whether the node is currently being previewed.
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80 * @param $revision_id
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81 * (optional) The identifier of the node revision to be loaded. If none
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82 * is provided, the default revision will be loaded.
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83 *
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84 * @return array
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85 * A renderable array representing the node links.
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86 */
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87 public static function renderLinks($node_entity_id, $view_mode, $langcode, $is_in_preview, $revision_id = NULL) {
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88 $links = [
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89 '#theme' => 'links__node',
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90 '#pre_render' => ['drupal_pre_render_links'],
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91 '#attributes' => ['class' => ['links', 'inline']],
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92 ];
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93
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94 if (!$is_in_preview) {
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95 $storage = \Drupal::entityTypeManager()->getStorage('node');
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96 /** @var \Drupal\node\NodeInterface $revision */
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97 $revision = !isset($revision_id) ? $storage->load($node_entity_id) : $storage->loadRevision($revision_id);
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98 $entity = $revision->getTranslation($langcode);
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99 $links['node'] = static::buildLinks($entity, $view_mode);
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100
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101 // Allow other modules to alter the node links.
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102 $hook_context = [
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103 'view_mode' => $view_mode,
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104 'langcode' => $langcode,
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105 ];
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106 \Drupal::moduleHandler()->alter('node_links', $links, $entity, $hook_context);
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107 }
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108 return $links;
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109 }
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110
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111 /**
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112 * Build the default links (Read more) for a node.
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113 *
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114 * @param \Drupal\node\NodeInterface $entity
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115 * The node object.
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116 * @param string $view_mode
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117 * A view mode identifier.
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118 *
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119 * @return array
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120 * An array that can be processed by drupal_pre_render_links().
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121 */
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122 protected static function buildLinks(NodeInterface $entity, $view_mode) {
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123 $links = [];
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124
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125 // Always display a read more link on teasers because we have no way
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126 // to know when a teaser view is different than a full view.
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127 if ($view_mode == 'teaser') {
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128 $node_title_stripped = strip_tags($entity->label());
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129 $links['node-readmore'] = [
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130 'title' => t('Read more<span class="visually-hidden"> about @title</span>', [
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131 '@title' => $node_title_stripped,
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132 ]),
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133 'url' => $entity->toUrl(),
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134 'language' => $entity->language(),
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135 'attributes' => [
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136 'rel' => 'tag',
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137 'title' => $node_title_stripped,
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138 ],
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139 ];
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140 }
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141
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142 return [
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143 '#theme' => 'links__node__node',
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144 '#links' => $links,
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145 '#attributes' => ['class' => ['links', 'inline']],
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146 ];
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147 }
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148
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149 }
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