public function SettingTrait::previousValue in Fasttoggle 8.2

Move to the previous setting value and save it.

(Allows some widget to implement forward and back buttons if desired).

Parameters

string $attribute: The name of the particular attribute being toggled.

Return value

mixed The array key for the new value.

File

src/Plugin/Setting/SettingTrait.php, line 211

Fasttoggle Object List of Values Setting

Class

SettingTrait

Abstract interface for settings.

Namespace

Drupal\fasttoggle\Plugin\Setting

Code

public function previousValue($instance) {
  $values = $this
    ->getValueList();
  $current = $this
    ->get_value($instance);
  $previousKey = NULL;
  $newKey = NULL;
  foreach (array_keys($values) as $key) {
    if ($key == $current) {
      if (isNull($previousKey)) {

        // Return the last key.
        end($values);
        $this
          ->set_value($instance, current($values));
      }
      else {
        $newKey = $previousKey;
      }
    }
  }

  // If not found use the default.
  if (isNull($newKey)) {
    $newKey = $this
      ->getDefault();
  }
  $this
    ->set_value($instance, $newKey);
  return $this;
}