From 874dfad08bf586398bef9c29dfd4b63079084c2c Mon Sep 17 00:00:00 2001
From: Paul Weidner <paul.weidner@gmail.com>
Date: Fri, 17 Jun 2022 16:04:14 -0700
Subject: [PATCH] Add asset_current_location field formatter.

---
 .../AssetCurrentLocationFormatter.php         | 109 ++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 modules/core/location/src/Plugin/Field/FieldFormatter/AssetCurrentLocationFormatter.php

diff --git a/modules/core/location/src/Plugin/Field/FieldFormatter/AssetCurrentLocationFormatter.php b/modules/core/location/src/Plugin/Field/FieldFormatter/AssetCurrentLocationFormatter.php
new file mode 100644
index 000000000..b4f8745af
--- /dev/null
+++ b/modules/core/location/src/Plugin/Field/FieldFormatter/AssetCurrentLocationFormatter.php
@@ -0,0 +1,109 @@
+<?php
+
+namespace Drupal\farm_location\Plugin\Field\FieldFormatter;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceLabelFormatter;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Field formatter for the current location asset field.
+ *
+ * @FieldFormatter(
+ *   id = "asset_current_location",
+ *   label = @Translation("Asset current location"),
+ *   description = @Translation("Display the label of the referenced entities."),
+ *   field_types = {
+ *     "entity_reference"
+ *   }
+ * )
+ */
+class AssetCurrentLocationFormatter extends EntityReferenceLabelFormatter {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    return [
+      'render_without_location' => FALSE,
+      'move_asset_button' => FALSE,
+    ] + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, FormStateInterface $form_state) {
+    $elements = parent::settingsForm($form, $form_state);
+    $elements['render_without_location'] = [
+      '#title' => $this->t('Render without location'),
+      '#description' => $this->t('Include this field when the asset has no current location.'),
+      '#type' => 'checkbox',
+      '#default_value' => $this->getSetting('render_without_location'),
+    ];
+    $elements['move_asset_button'] = [
+      '#title' => $this->t('Move asset button'),
+      '#description' => $this->t('Include a button to move the asset.'),
+      '#type' => 'checkbox',
+      '#default_value' => $this->getSetting('move_asset_button'),
+    ];
+    return $elements;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsSummary() {
+    $summary = parent::settingsSummary();
+    $summary[] = $this->getSetting('render_without_location') ? $this->t('Render without current location') : $this->t('Do not render without current location');
+    $summary[] = $this->getSetting('move_asset_button') ? $this->t('Include move asset button') : $this->t('No move asset button');
+    return $summary;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function viewElements(FieldItemListInterface $items, $langcode) {
+
+    // Build labels in parent.
+    $elements = parent::viewElements($items, $langcode);
+
+    // Get the asset.
+    $asset = $items->getEntity();
+
+    // If there are no current locations only render if configured to.
+    if (empty($elements) && !$this->getSetting('render_without_location')) {
+      return $elements;
+    }
+
+    // Add N/A if there are no current locations.
+    if (empty($elements)) {
+
+      // Render N/A if configured.
+      $elements[] = ['#markup' => 'N/A'];
+    }
+
+    // Add the move asset button if configured.
+    if ($this->getSetting('move_asset_button')) {
+
+      // Append a "Move asset" link.
+      $options = [
+        'query' => [
+          'asset' => $asset->id(),
+          'destination' => $asset->toUrl()->toString(),
+        ],
+      ];
+      $elements[] = [
+        '#type' => 'link',
+        '#title' => $this->t('Move asset'),
+        '#url' => Url::fromRoute('farm_location.asset_move_action_form', [], $options),
+        '#attributes' => [
+          'class' => ['button', 'button--small'],
+        ],
+      ];
+    }
+    return $elements;
+  }
+
+}