original_string: protected function add_event_duration_elements($mform) {
          $group = [];
          $group[] = $mform->createElement('radio', 'duration', null, get_string('durationnone', 'calendar'), 0);
          $group[] = $mform->createElement('radio', 'duration', null, get_string('durationuntil', 'calendar'), 1);
          $group[] = $mform->createElement('date_time_selector', 'timedurationuntil', '');
          $group[] = $mform->createElement('radio', 'duration', null, get_string('durationminutes', 'calendar'), 2);
          $group[] = $mform->createElement('text', 'timedurationminutes', get_string('durationminutes', 'calendar'));
  
          $mform->addGroup($group, 'durationgroup', get_string('eventduration', 'calendar'), '<br />', false);
          $mform->setAdvanced('durationgroup');
  
          $mform->disabledIf('timedurationuntil',         'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[day]',    'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[month]',  'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[year]',   'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[hour]',   'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[minute]', 'duration', 'noteq', 1);
  
          $mform->setType('timedurationminutes', PARAM_INT);
          $mform->disabledIf('timedurationminutes', 'duration', 'noteq', 2);
  
          $mform->setDefault('duration', 0);
      }
code: protected function add_event_duration_elements($mform) {
          $group = [];
          $group[] = $mform->createElement('radio', 'duration', null, get_string('durationnone', 'calendar'), 0);
          $group[] = $mform->createElement('radio', 'duration', null, get_string('durationuntil', 'calendar'), 1);
          $group[] = $mform->createElement('date_time_selector', 'timedurationuntil', '');
          $group[] = $mform->createElement('radio', 'duration', null, get_string('durationminutes', 'calendar'), 2);
          $group[] = $mform->createElement('text', 'timedurationminutes', get_string('durationminutes', 'calendar'));
  
          $mform->addGroup($group, 'durationgroup', get_string('eventduration', 'calendar'), '<br />', false);
          $mform->setAdvanced('durationgroup');
  
          $mform->disabledIf('timedurationuntil',         'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[day]',    'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[month]',  'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[year]',   'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[hour]',   'duration', 'noteq', 1);
          $mform->disabledIf('timedurationuntil[minute]', 'duration', 'noteq', 1);
  
          $mform->setType('timedurationminutes', PARAM_INT);
          $mform->disabledIf('timedurationminutes', 'duration', 'noteq', 2);
  
          $mform->setDefault('duration', 0);
      }
code_tokens: protected function add_event_duration_elements ( $ mform ) { $ group = [ ] ; $ group [ ] = $ mform -> createElement ( 'radio' , 'duration' , null , get_string ( 'durationnone' , 'calendar' ) , 0 ) ; $ group [ ] = $ mform -> createElement ( 'radio' , 'duration' , null , get_string ( 'durationuntil' , 'calendar' ) , 1 ) ; $ group [ ] = $ mform -> createElement ( 'date_time_selector' , 'timedurationuntil' , '' ) ; $ group [ ] = $ mform -> createElement ( 'radio' , 'duration' , null , get_string ( 'durationminutes' , 'calendar' ) , 2 ) ; $ group [ ] = $ mform -> createElement ( 'text' , 'timedurationminutes' , get_string ( 'durationminutes' , 'calendar' ) ) ; $ mform -> addGroup ( $ group , 'durationgroup' , get_string ( 'eventduration' , 'calendar' ) , '<br />' , false ) ; $ mform -> setAdvanced ( 'durationgroup' ) ; $ mform -> disabledIf ( 'timedurationuntil' , 'duration' , 'noteq' , 1 ) ; $ mform -> disabledIf ( 'timedurationuntil[day]' , 'duration' , 'noteq' , 1 ) ; $ mform -> disabledIf ( 'timedurationuntil[month]' , 'duration' , 'noteq' , 1 ) ; $ mform -> disabledIf ( 'timedurationuntil[year]' , 'duration' , 'noteq' , 1 ) ; $ mform -> disabledIf ( 'timedurationuntil[hour]' , 'duration' , 'noteq' , 1 ) ; $ mform -> disabledIf ( 'timedurationuntil[minute]' , 'duration' , 'noteq' , 1 ) ; $ mform -> setType ( 'timedurationminutes' , PARAM_INT ) ; $ mform -> disabledIf ( 'timedurationminutes' , 'duration' , 'noteq' , 2 ) ; $ mform -> setDefault ( 'duration' , 0 ) ; }
docstring: Add the various elements to express the duration options available
  for an event.
  
  @param MoodleQuickForm $mform
docstring_tokens: Add the various elements to express the duration options available for an event .