Proyectos de Subversion Moodle

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1 efrain 1
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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/**
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 * Question type class for the drag-and-drop onto image question type.
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 *
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 * @package    qtype_ddimageortext
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 * @copyright  2009 The Open University
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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defined('MOODLE_INTERNAL') || die();
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require_once($CFG->libdir . '/questionlib.php');
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require_once($CFG->dirroot . '/question/engine/lib.php');
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require_once($CFG->dirroot . '/question/format/xml/format.php');
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require_once($CFG->dirroot . '/question/type/gapselect/questiontypebase.php');
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/**
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 * The drag-and-drop onto image question type class.
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 *
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 * @copyright  2009 The Open University
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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class qtype_ddtoimage_base extends question_type {
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    /**
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     * Returns the choice group key.
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     *
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     * @return string
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     */
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    protected function choice_group_key() {
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        return 'draggroup';
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    }
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    public function get_question_options($question) {
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        global $DB;
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        $dbprefix = 'qtype_'.$this->name();
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        $question->options = $DB->get_record($dbprefix,
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                array('questionid' => $question->id), '*', MUST_EXIST);
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        $question->options->drags = $DB->get_records($dbprefix.'_drags',
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                array('questionid' => $question->id), 'no ASC', '*');
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        $question->options->drops = $DB->get_records($dbprefix.'_drops',
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                array('questionid' => $question->id), 'no ASC', '*');
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        parent::get_question_options($question);
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    }
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    protected function initialise_question_instance(question_definition $question, $questiondata) {
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        parent::initialise_question_instance($question, $questiondata);
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        $question->shufflechoices = $questiondata->options->shuffleanswers;
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        $this->initialise_combined_feedback($question, $questiondata, true);
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        $question->choices = array();
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        $choiceindexmap = array();
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        // Store the choices in arrays by group.
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        // This code is weird. The first choice in each group gets key 1 in the
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        // $question->choices[$choice->choice_group()] array, and the others get
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        // key $choice->no. Therefore you need to think carefully whether you
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        // are using the key, or $choice->no. This is presumably a mistake, but
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        // one that is now essentially un-fixable, since many questions of this
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        // type have been attempted, and theys keys get stored in the attempt data.
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        foreach ($questiondata->options->drags as $dragdata) {
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            $choice = $this->make_choice($dragdata);
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            if (array_key_exists($choice->choice_group(), $question->choices)) {
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                $question->choices[$choice->choice_group()][$dragdata->no] = $choice;
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            } else {
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                $question->choices[$choice->choice_group()][1] = $choice;
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            }
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            end($question->choices[$choice->choice_group()]);
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            $choiceindexmap[$dragdata->no] = array($choice->choice_group(),
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                    key($question->choices[$choice->choice_group()]));
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        }
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        $question->places = array();
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        $question->rightchoices = array();
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        $i = 1;
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        foreach ($questiondata->options->drops as $dropdata) {
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            list($group, $choiceindex) = $choiceindexmap[$dropdata->choice];
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            $dropdata->group = $group;
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            $question->places[$dropdata->no] = $this->make_place($dropdata);
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            $question->rightchoices[$dropdata->no] = $choiceindex;
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        }
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    }
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    /**
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     * Convert files into text output in the given format.
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     * This method is copied from qformat_default as a quick fix, as the method there is
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     * protected.
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     * @param array $files
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     * @param int $indent Number of spaces to indent
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     * @return string $string
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     */
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    public function write_files($files, $indent) {
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        if (empty($files)) {
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            return '';
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        }
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        $string = '';
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        foreach ($files as $file) {
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            if ($file->is_directory()) {
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                continue;
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            }
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            $string .= str_repeat('  ', $indent);
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            $string .= '<file name="' . $file->get_filename() . '" encoding="base64">';
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            $string .= base64_encode($file->get_content());
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            $string .= "</file>\n";
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        }
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        return $string;
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    }
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    public function get_possible_responses($questiondata) {
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        $question = $this->make_question($questiondata);
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        $parts = array();
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        foreach ($question->places as $placeno => $place) {
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            $choices = array();
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            foreach ($question->choices[$place->group] as $i => $choice) {
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                $correct = $question->rightchoices[$placeno] == $i;
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                $choices[$choice->no] = new question_possible_response($choice->summarise(), $correct ? 1 : 0);
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            }
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            $choices[null] = question_possible_response::no_response();
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            $parts[$placeno] = $choices;
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        }
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        return $parts;
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    }
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    public function get_random_guess_score($questiondata) {
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        $question = $this->make_question($questiondata);
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        return $question->get_random_guess_score();
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    }
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    public function delete_question($questionid, $contextid) {
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        global $DB;
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        $DB->delete_records('qtype_'.$this->name(), array('questionid' => $questionid));
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        $DB->delete_records('qtype_'.$this->name().'_drags', array('questionid' => $questionid));
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        $DB->delete_records('qtype_'.$this->name().'_drops', array('questionid' => $questionid));
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        return parent::delete_question($questionid, $contextid);
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    }
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}