protected function add_unit(ImsQtiWriter $body, $question)
{
switch ($question->options->showunits) {
case self::UNIT_TEXTBOX:
//Edit unit Editable text input element
$expected_length = 1;
foreach ($question->options->units as $unit) {
$expected_length = max($expected_length, strlen($unit->unit));
}
return $body->add_extendedTextInteraction(self::UNIT, $expected_length, 1, 1);
case self::UNIT_RADIO:
//Select units Choice radio element of 2 Units minimum
$result = $body->add_choiceInteraction(self::UNIT, 1, false);
foreach ($question->options->units as $unit) {
$choice = $result->add_simpleChoice($unit->unit);
$choice->add_span($unit->unit);
}
return $result;
case self::UNIT_READONLY:
//Display unit NON editable text of Unit No1
if (isset($question->options->units[0])) {
$result = $body->add_span($question->options->units[0]->unit);
} else {
$result = null;
}
return $result;
case self::UNIT_HIDE:
//No unit display Only numerical answer will be graded
//do nothing
return null;
}
}
