Form constructor.
array $form: An associative array containing the structure of the form.
array $form_state: An associative array containing the current state of the form.
array The form structure.
Overrides ConfigurableActionInterface::form
public function form(array $form, array &$form_state) {
$form['message'] = array(
'#type' => 'textarea',
'#title' => t('Message'),
'#default_value' => $this->configuration['message'],
'#required' => TRUE,
'#rows' => '8',
'#description' => t('The message to be displayed to the current user. You may include placeholders like [node:title], [user:name], and [comment:body] to represent data that will be different each time message is sent. Not all placeholders will be available in all contexts.'),
);
return $form;
}