Issue #3183616: Invert List of Year from recent to older in the Year Views dropdown

year_views/config/schema/year_views.schema.yml

@@ -5,3 +5,12 @@ views.filter.year_field:
     reduce_duplicates:
       type: boolean
       label: 'Reduce duplicate'
+    year_from:
+      type: string
+      label: 'Start year'
+    year_to:
+      type: string
+      label: 'End year'
+    sort_order:
+      type: string
+      label: 'Sort order'

year_views/src/Plugin/views/filter/YearField.php

@@ -24,6 +24,12 @@ class YearField extends ManyToOne {
 
     // Set the options based on extra settings.
     $range = range($this->calculateYear($this->options['year_from']), $this->calculateYear($this->options['year_to']));
+
+    // Reverse the sort order if needed.
+    if ($this->options['sort_order'] == 'desc') {
+      $range = array_reverse($range, TRUE);
+    }
+
     $this->valueOptions = array_combine($range, $range);
   }
 
@@ -64,6 +70,7 @@ class YearField extends ManyToOne {
     $options = parent::defineOptions();
     $options['year_from'] = ['default' => '-30 years'];
     $options['year_to'] = ['default' => '+15 years'];
+    $options['sort_order'] = ['default' => 'asc'];
 
     return $options;
   }
@@ -85,7 +92,7 @@ class YearField extends ManyToOne {
 
     $form['year_from'] = [
       '#type' => 'textfield',
-      '#title' => $this->t('From Year'),
+      '#title' => $this->t('From year'),
       '#required' => TRUE,
       '#default_value' => $this->options['year_from'],
       '#description' => $this->t("Enter a starting year"),
@@ -94,12 +101,24 @@ class YearField extends ManyToOne {
 
     $form['year_to'] = [
       '#type' => 'textfield',
-      '#title' => $this->t('To Year'),
+      '#title' => $this->t('To year'),
       '#required' => TRUE,
       '#default_value' => $this->options['year_to'],
       '#description' => $this->t("Enter an end year."),
       '#weight' => 2,
     ];
+
+    $form['sort_order'] = [
+      '#type' => 'radios',
+      '#title' => $this->t('Sort order'),
+      '#required' => TRUE,
+      '#default_value' => $this->options['sort_order'],
+      '#options' => [
+        'asc' => $this->t('Ascending'),
+        'desc' => $this->t('Descending'),
+      ],
+      '#weight' => 2,
+    ];
   }
 
 }