/**
* Display the icon for whether this question can only be seen if the previous
* one has been answered.
*
* @param structure $structure object containing the structure of the quiz.
* @param int $slot the first slot on the page we are outputting.
* @return string HTML to output.
*/
public function question_dependency_icon($structure, $slot)
{
$a = array('thisq' => $structure->get_displayed_number_for_slot($slot), 'previousq' => $structure->get_displayed_number_for_slot(max($slot - 1, 1)));
if ($structure->is_question_dependent_on_previous_slot($slot)) {
$title = get_string('questiondependencyremove', 'quiz', $a);
$image = $this->pix_icon('t/locked', get_string('questiondependsonprevious', 'quiz'), 'moodle', array('title' => ''));
$action = 'removedependency';
} else {
$title = get_string('questiondependencyadd', 'quiz', $a);
$image = $this->pix_icon('t/unlocked', get_string('questiondependencyfree', 'quiz'), 'moodle', array('title' => ''));
$action = 'adddependency';
}
// Disable the link if quiz has attempts.
$disabled = null;
if (!$structure->can_be_edited()) {
$disabled = 'disabled';
}
$extraclass = '';
if (!$structure->can_question_depend_on_previous_slot($slot)) {
$extraclass = ' question_dependency_cannot_depend';
}
return html_writer::span($this->action_link('#', $image, null, array('title' => $title, 'class' => 'cm-edit-action', 'disabled' => $disabled, 'data-action' => $action)), 'question_dependency_wrapper' . $extraclass);
}
