diff core/modules/layout_builder/src/Section.php @ 14:1fec387a4317

Update Drupal core to 8.5.2 via Composer

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/layout_builder/src/Section.php	Mon Apr 23 09:46:53 2018 +0100
@@ -0,0 +1,341 @@
+<?php
+
+namespace Drupal\layout_builder;
+
+/**
+ * Provides a domain object for layout sections.
+ *
+ * A section consists of three parts:
+ * - The layout plugin ID for the layout applied to the section (for example,
+ *   'layout_onecol').
+ * - An array of settings for the layout plugin.
+ * - An array of components that can be rendered in the section.
+ *
+ * @internal
+ *   Layout Builder is currently experimental and should only be leveraged by
+ *   experimental modules and development releases of contributed modules.
+ *   See https://www.drupal.org/core/experimental for more information.
+ *
+ * @see \Drupal\Core\Layout\LayoutDefinition
+ * @see \Drupal\layout_builder\SectionComponent
+ *
+ * @todo Determine whether an interface will be provided for this in
+ *   https://www.drupal.org/project/drupal/issues/2930334.
+ */
+class Section {
+
+  /**
+   * The layout plugin ID.
+   *
+   * @var string
+   */
+  protected $layoutId;
+
+  /**
+   * The layout plugin settings.
+   *
+   * @var array
+   */
+  protected $layoutSettings = [];
+
+  /**
+   * An array of components, keyed by UUID.
+   *
+   * @var \Drupal\layout_builder\SectionComponent[]
+   */
+  protected $components = [];
+
+  /**
+   * Constructs a new Section.
+   *
+   * @param string $layout_id
+   *   The layout plugin ID.
+   * @param array $layout_settings
+   *   (optional) The layout plugin settings.
+   * @param \Drupal\layout_builder\SectionComponent[] $components
+   *   (optional) The components.
+   */
+  public function __construct($layout_id, array $layout_settings = [], array $components = []) {
+    $this->layoutId = $layout_id;
+    $this->layoutSettings = $layout_settings;
+    foreach ($components as $component) {
+      $this->setComponent($component);
+    }
+  }
+
+  /**
+   * Returns the renderable array for this section.
+   *
+   * @param \Drupal\Core\Plugin\Context\ContextInterface[] $contexts
+   *   An array of available contexts.
+   * @param bool $in_preview
+   *   TRUE if the section is being previewed, FALSE otherwise.
+   *
+   * @return array
+   *   A renderable array representing the content of the section.
+   */
+  public function toRenderArray(array $contexts = [], $in_preview = FALSE) {
+    $regions = [];
+    foreach ($this->getComponents() as $component) {
+      if ($output = $component->toRenderArray($contexts, $in_preview)) {
+        $regions[$component->getRegion()][$component->getUuid()] = $output;
+      }
+    }
+
+    return $this->getLayout()->build($regions);
+  }
+
+  /**
+   * Gets the layout plugin for this section.
+   *
+   * @return \Drupal\Core\Layout\LayoutInterface
+   *   The layout plugin.
+   */
+  public function getLayout() {
+    return $this->layoutPluginManager()->createInstance($this->getLayoutId(), $this->getLayoutSettings());
+  }
+
+  /**
+   * Gets the layout plugin ID for this section.
+   *
+   * @return string
+   *   The layout plugin ID.
+   *
+   * @internal
+   *   This method should only be used by code responsible for storing the data.
+   */
+  public function getLayoutId() {
+    return $this->layoutId;
+  }
+
+  /**
+   * Gets the layout plugin settings for this section.
+   *
+   * @return mixed[]
+   *   The layout plugin settings.
+   *
+   * @internal
+   *   This method should only be used by code responsible for storing the data.
+   */
+  public function getLayoutSettings() {
+    return $this->layoutSettings;
+  }
+
+  /**
+   * Sets the layout plugin settings for this section.
+   *
+   * @param mixed[] $layout_settings
+   *   The layout plugin settings.
+   *
+   * @return $this
+   */
+  public function setLayoutSettings(array $layout_settings) {
+    $this->layoutSettings = $layout_settings;
+    return $this;
+  }
+
+  /**
+   * Gets the default region.
+   *
+   * @return string
+   *   The machine-readable name of the default region.
+   */
+  public function getDefaultRegion() {
+    return $this->layoutPluginManager()->getDefinition($this->getLayoutId())->getDefaultRegion();
+  }
+
+  /**
+   * Returns the components of the section.
+   *
+   * @return \Drupal\layout_builder\SectionComponent[]
+   *   The components.
+   */
+  public function getComponents() {
+    return $this->components;
+  }
+
+  /**
+   * Gets the component for a given UUID.
+   *
+   * @param string $uuid
+   *   The UUID of the component to retrieve.
+   *
+   * @return \Drupal\layout_builder\SectionComponent
+   *   The component.
+   *
+   * @throws \InvalidArgumentException
+   *   Thrown when the expected UUID does not exist.
+   */
+  public function getComponent($uuid) {
+    if (!isset($this->components[$uuid])) {
+      throw new \InvalidArgumentException(sprintf('Invalid UUID "%s"', $uuid));
+    }
+
+    return $this->components[$uuid];
+  }
+
+  /**
+   * Helper method to set a component.
+   *
+   * @param \Drupal\layout_builder\SectionComponent $component
+   *   The component.
+   *
+   * @return $this
+   */
+  protected function setComponent(SectionComponent $component) {
+    $this->components[$component->getUuid()] = $component;
+    return $this;
+  }
+
+  /**
+   * Removes a given component from a region.
+   *
+   * @param string $uuid
+   *   The UUID of the component to remove.
+   *
+   * @return $this
+   */
+  public function removeComponent($uuid) {
+    unset($this->components[$uuid]);
+    return $this;
+  }
+
+  /**
+   * Appends a component to the end of a region.
+   *
+   * @param \Drupal\layout_builder\SectionComponent $component
+   *   The component being appended.
+   *
+   * @return $this
+   */
+  public function appendComponent(SectionComponent $component) {
+    $component->setWeight($this->getNextHighestWeight($component->getRegion()));
+    $this->setComponent($component);
+    return $this;
+  }
+
+  /**
+   * Returns the next highest weight of the component in a region.
+   *
+   * @param string $region
+   *   The region name.
+   *
+   * @return int
+   *   A number higher than the highest weight of the component in the region.
+   */
+  protected function getNextHighestWeight($region) {
+    $components = $this->getComponentsByRegion($region);
+    $weights = array_map(function (SectionComponent $component) {
+      return $component->getWeight();
+    }, $components);
+    return $weights ? max($weights) + 1 : 0;
+  }
+
+  /**
+   * Gets the components for a specific region.
+   *
+   * @param string $region
+   *   The region name.
+   *
+   * @return \Drupal\layout_builder\SectionComponent[]
+   *   An array of components in the specified region, sorted by weight.
+   */
+  protected function getComponentsByRegion($region) {
+    $components = array_filter($this->getComponents(), function (SectionComponent $component) use ($region) {
+      return $component->getRegion() === $region;
+    });
+    uasort($components, function (SectionComponent $a, SectionComponent $b) {
+      return $a->getWeight() > $b->getWeight() ? 1 : -1;
+    });
+    return $components;
+  }
+
+  /**
+   * Inserts a component after a specified existing component.
+   *
+   * @param string $preceding_uuid
+   *   The UUID of the existing component to insert after.
+   * @param \Drupal\layout_builder\SectionComponent $component
+   *   The component being inserted.
+   *
+   * @return $this
+   *
+   * @throws \InvalidArgumentException
+   *   Thrown when the expected UUID does not exist.
+   */
+  public function insertAfterComponent($preceding_uuid, SectionComponent $component) {
+    // Find the delta of the specified UUID.
+    $uuids = array_keys($this->getComponentsByRegion($component->getRegion()));
+    $delta = array_search($preceding_uuid, $uuids, TRUE);
+    if ($delta === FALSE) {
+      throw new \InvalidArgumentException(sprintf('Invalid preceding UUID "%s"', $preceding_uuid));
+    }
+    return $this->insertComponent($delta + 1, $component);
+  }
+
+  /**
+   * Inserts a component at a specified delta.
+   *
+   * @param int $delta
+   *   The zero-based delta in which to insert the component.
+   * @param \Drupal\layout_builder\SectionComponent $new_component
+   *   The component being inserted.
+   *
+   * @return $this
+   *
+   * @throws \OutOfBoundsException
+   *   Thrown when the specified delta is invalid.
+   */
+  public function insertComponent($delta, SectionComponent $new_component) {
+    $components = $this->getComponentsByRegion($new_component->getRegion());
+    $count = count($components);
+    if ($delta > $count) {
+      throw new \OutOfBoundsException(sprintf('Invalid delta "%s" for the "%s" component', $delta, $new_component->getUuid()));
+    }
+
+    // If the delta is the end of the list, append the component instead.
+    if ($delta === $count) {
+      return $this->appendComponent($new_component);
+    }
+
+    // Find the weight of the component that exists at the specified delta.
+    $weight = array_values($components)[$delta]->getWeight();
+    $this->setComponent($new_component->setWeight($weight++));
+
+    // Increase the weight of every subsequent component.
+    foreach (array_slice($components, $delta) as $component) {
+      $component->setWeight($weight++);
+    }
+    return $this;
+  }
+
+  /**
+   * Wraps the layout plugin manager.
+   *
+   * @return \Drupal\Core\Layout\LayoutPluginManagerInterface
+   *   The layout plugin manager.
+   */
+  protected function layoutPluginManager() {
+    return \Drupal::service('plugin.manager.core.layout');
+  }
+
+  /**
+   * Returns an array representation of the section.
+   *
+   * @internal
+   *   This is intended for use by a storage mechanism for sections.
+   *
+   * @return array
+   *   An array representation of the section component.
+   */
+  public function toArray() {
+    return [
+      'layout_id' => $this->getLayoutId(),
+      'layout_settings' => $this->getLayoutSettings(),
+      'components' => array_map(function (SectionComponent $component) {
+        return $component->toArray();
+      }, $this->getComponents()),
+    ];
+  }
+
+}