chamilo-lms/main/exercice/multiple_answer.class.php

<?php
/* For licensing terms, see /license.txt */

/**
 *	Class MultipleAnswer
 *
 *	This class allows to instantiate an object of type MULTIPLE_ANSWER (MULTIPLE CHOICE, MULTIPLE ANSWER),
 *	extending the class question
 *
 *	@author Eric Marguin
 *	@package chamilo.exercise
 **/
class MultipleAnswer extends Question
{
	static $typePicture = 'mcma.png';
	static $explanationLangVar = 'MultipleSelect';

	/**
	 * Constructor
	 */
	function MultipleAnswer()
    {
		parent::question();
		$this -> type = MULTIPLE_ANSWER;
		$this -> isContent = $this-> getIsContent();
	}

	/**
	 * function which redifines Question::createAnswersForm
	 * @param the formvalidator instance
	 * @param the answers number to display
	 */
	function createAnswersForm ($form)
    {

		$nb_answers = isset($_POST['nb_answers']) ? $_POST['nb_answers'] : 4;  // The previous default value was 2. See task #1759.
		$nb_answers += (isset($_POST['lessAnswers']) ? -1 : (isset($_POST['moreAnswers']) ? 1 : 0));

		$obj_ex = $_SESSION['objExercise'];

		$html='<table class="data_table">
					<tr>
						<th width="10px">
							'.get_lang('Number').'
						</th>
						<th width="10px">
							'.get_lang('True').'
						</th>
						<th width="50%">
							'.get_lang('Answer').'
						</th>';
				// show column comment when feedback is enable
                $html .='<th>
                            '.get_lang('Comment').'
                        </th>';
				$html .= '<th width="50px">
							'.get_lang('Weighting').'
						</th>
					</tr>';
		$form -> addElement ('label', get_lang('Answers').'<br /> <img src="../img/fill_field.png">', $html);

		$defaults = array();
		$correct = 0;
        $answer = false;
		if(!empty($this -> id))	{
			$answer = new Answer($this -> id);
			$answer -> read();
			if(count($answer->nbrAnswers)>0 && !$form->isSubmitted()) {
				$nb_answers = $answer->nbrAnswers;
			}
		}

		$form -> addElement('hidden', 'nb_answers');
		$boxes_names = array();

		if ($nb_answers < 1) {
			$nb_answers = 1;
			Display::display_normal_message(get_lang('YouHaveToCreateAtLeastOneAnswer'));
		}

		for ($i = 1 ; $i <= $nb_answers ; ++$i) {
			if(is_object($answer)) {
				$defaults['answer['.$i.']'] = $answer -> answer[$i];
				$defaults['comment['.$i.']'] = $answer -> comment[$i];
				$defaults['weighting['.$i.']'] = float_format($answer -> weighting[$i], 1);
				$defaults['correct['.$i.']'] = $answer -> correct[$i];
			} else {
				$defaults['answer[1]']  = get_lang('DefaultMultipleAnswer2');
				$defaults['comment[1]'] = get_lang('DefaultMultipleComment2');
				$defaults['correct[1]'] = true;
				$defaults['weighting[1]'] = 10;

				$defaults['answer[2]']  = get_lang('DefaultMultipleAnswer1');
				$defaults['comment[2]'] = get_lang('DefaultMultipleComment1');
				$defaults['correct[2]'] = false;
				$defaults['weighting[2]'] = -5;
			}
			$renderer = & $form->defaultRenderer();

            $renderer->setElementTemplate('<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>', 'correct['.$i.']');
            $renderer->setElementTemplate('<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>', 'counter['.$i.']');
            $renderer->setElementTemplate('<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>', 'answer['.$i.']');
            $renderer->setElementTemplate('<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>', 'comment['.$i.']');
            $renderer->setElementTemplate('<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>', 'weighting['.$i.']');

			$answer_number=$form->addElement('text', 'counter['.$i.']', null, 'value="'.$i.'"');
			$answer_number->freeze();

			$form->addElement('checkbox', 'correct['.$i.']', null, null, 'class="checkbox" style="margin-left: 0em;"');
			$boxes_names[] = 'correct['.$i.']';

			$form->addElement('html_editor', 'answer['.$i.']',null, array(), array('ToolbarSet' => 'TestProposedAnswer', 'Width' => '100%', 'Height' => '100'));
			$form->addRule('answer['.$i.']', get_lang('ThisFieldIsRequired'), 'required');

				$form->addElement('html_editor', 'comment['.$i.']',null, array(), array('ToolbarSet' => 'TestProposedAnswer', 'Width' => '100%', 'Height' => '100'));

			$form->addElement('text', 'weighting['.$i.']',null, array('class' => "span1", 'value' => '0'));
			$form -> addElement ('html', '</tr>');
		}
		$form -> addElement ('html', '</table>');
		$form -> addElement ('html', '<br />');

		$form -> add_multiple_required_rule ($boxes_names , get_lang('ChooseAtLeastOneCheckbox') , 'multiple_required');

		global $text, $class;
		if ($obj_ex->edit_exercise_in_lp == true) {
			// setting the save button here and not in the question class.php
			$form->addElement('style_submit_button', 'lessAnswers', get_lang('LessAnswer'),'class="btn minus"');
			$form->addElement('style_submit_button', 'moreAnswers', get_lang('PlusAnswer'),'class="btn plus"');
			$form->addElement('style_submit_button','submitQuestion',$text, 'class="'.$class.'"');
		}

		$renderer->setElementTemplate('{element}&nbsp;','lessAnswers');
		$renderer->setElementTemplate('{element}&nbsp;','submitQuestion');
		$renderer->setElementTemplate('{element}&nbsp;','moreAnswers');
		$form -> addElement ('html', '</div></div>');

		$defaults['correct'] = $correct;

		if (!empty($this -> id)) {
			$form -> setDefaults($defaults);
		} else {
			if ($this -> isContent == 1) {
				$form -> setDefaults($defaults);
			}
		}
		$form->setConstants(array('nb_answers' => $nb_answers));
	}


	/**
	 * abstract function which creates the form to create / edit the answers of the question
	 * @param the formvalidator instance
	 * @param the answers number to display
	 */
	function processAnswersCreation($form) {

		$questionWeighting = $nbrGoodAnswers = 0;
		$objAnswer  = new Answer($this->id);
		$nb_answers = $form->getSubmitValue('nb_answers');

		for($i=1 ; $i <= $nb_answers ; $i++) {
        	$answer = trim($form -> getSubmitValue('answer['.$i.']'));
            $comment = trim($form -> getSubmitValue('comment['.$i.']'));
            $weighting = trim($form -> getSubmitValue('weighting['.$i.']'));
            $goodAnswer = trim($form -> getSubmitValue('correct['.$i.']'));

			if ($goodAnswer) {
    			$weighting = abs($weighting);
			} else {
				$weighting = abs($weighting);
				$weighting = -$weighting;
			}
    		if($weighting > 0) {
                $questionWeighting += $weighting;
            }
        	$objAnswer -> createAnswer($answer,$goodAnswer,$comment,$weighting,$i);
        }

    	// saves the answers into the data base
        $objAnswer -> save();

        // sets the total weighting of the question
        $this->updateWeighting($questionWeighting);
        $this->save();
	}

	function return_header($feedback_type = null, $counter = null, $score = null)
    {
	    $header = parent::return_header($feedback_type, $counter, $score);
	    $header .= '<table class="'.$this->question_table_class .'">
			<tr>
				<th>'.get_lang("Choice").'</th>
				<th>'. get_lang("ExpectedChoice").'</th>
				<th>'. get_lang("Answer").'</th>';
        $header .= '<th>'.get_lang("Comment").'</th>';
        $header .= '</tr>';
        return $header;
	}


}