resource.class.php

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        return parent::delete_instance($resource);
    }


    /**
     * Display the file resource
     *
     * Displays a file resource embedded, in a frame, or in a popup.
     * Output depends on type of file resource.
     *
     * @param    CFG     global object
     */
    function display() {
        global $CFG, $THEME, $USER;

        require_once($CFG->libdir.'/filelib.php');

    /// Set up generic stuff first, including checking for access
        parent::display();

    /// Set up some shorthand variables
        $cm = $this->cm;
        $course = $this->course;
        $resource = $this->resource;

    /// Fetch parameters
        $inpopup = optional_param('inpopup', 0, PARAM_BOOL);
        $page    = optional_param('page', 0, PARAM_INT);
        $frameset= optional_param('frameset', '', PARAM_ALPHA);

    /// Init some variables
        $errorcode = 0;
        $buttontext = 0;
        $querystring = '';
        $resourcetype = '';
        $mimetype = mimeinfo("type", $resource->reference);
        $pagetitle = strip_tags($course->shortname.': '.format_string($resource->name));

        $formatoptions = new object();
        $formatoptions->noclean = true;

    /// Cache this per request
        static $items;

    /// Check for errors
        $errorcode = $this->check4errors($resource->reference, $course, $resource);

    /// If there are any error, show it instead of the resource page
        if ($errorcode) {
            if (!has_capability('moodle/course:activityvisibility', get_context_instance(CONTEXT_COURSE, $course->id))) {
            /// Resource not available page
                $errortext = get_string('resourcenotavailable','resource');
            } else {
            /// Depending of the error, show different messages and pages
                if ($errorcode ==1) {
                    $errortext = get_string('invalidfiletype','error', $resource->reference);
                } else if ($errorcode == 2) {
                    $errortext = get_string('filenotfound','error', $resource->reference);
                } else if ($errorcode == 3) {
                    $errortext = get_string('packagenotdeplyed','resource');
                } else if ($errorcode == 4) {
                    $errortext = get_string('packagechanged','resource');
                } else if ($errorcode == 5) {
                    $errortext = get_string('packagenotdeplyed','resource'); // no button though since from repository.
                }
            }
        /// Display the error and exit
            if ($inpopup) {
                print_header($pagetitle, $course->fullname.' : '.$resource->name);
            } else {
                $navigation = build_navigation($this->navlinks, $cm);
                print_header($pagetitle, $course->fullname, $navigation, "", "", true,
                        update_module_button($cm->id, $course->id, $this->strresource), navmenu($course, $cm));
            }
            print_simple_box_start('center', '60%');
            echo '<p align="center">'.$errortext.'</p>';
        /// If errors were 3 or 4 and isteacheredit(), show the deploy button
            if (has_capability('moodle/course:manageactivities', get_context_instance(CONTEXT_COURSE, $course->id)) && ($errorcode == 3 || $errorcode == 4)) {
                $link = 'type/ims/deploy.php';
                $options['courseid'] = $course->id;
                $options['cmid'] = $cm->id;
                $options['file'] = $resource->reference;
                $options['sesskey'] = $USER->sesskey;
                $options['inpopup'] = $inpopup;
                if ($errorcode == 3) {
                    $label = get_string ('deploy', 'resource');
                } else if ($errorcode == 4) {
                     $label = get_string ('redeploy', 'resource');
                }
                $method='post';
            /// Let's go with the button
                echo '<center>';
                print_single_button($link, $options, $label, $method);
                echo '</center>';
            }
            print_simple_box_end();
        /// Close button if inpopup
            if ($inpopup) {
                close_window_button();
            }

            print_footer();
            exit;
        }

    /// Load serialized IMS CP index to memory only once.
        if (empty($items)) {
            if (!$this->isrepository) {
                $resourcedir = $CFG->dataroot.'/'.$course->id.'/'.$CFG->moddata.'/resource/'.$resource->id;
            }
            else {
                $resourcedir = $CFG->repository . $resource->reference;
            }
            if (!$items = ims_load_serialized_file($resourcedir.'/moodle_inx.ser')) {
                error (get_string('errorreadingfile', 'error', 'moodle_inx.ser'));
            }
        }

    /// Check whether this is supposed to be a popup, but was called directly

        if (empty($frameset) && $resource->popup && !$inpopup) {    /// Make a page and a pop-up window
            $navigation = build_navigation($this->navlinks, $cm);

            print_header($pagetitle, $course->fullname, $navigation, "", "", true,
                    update_module_button($cm->id, $course->id, $this->strresource), navmenu($course, $cm));

            echo "\n<script type=\"text/javascript\">";
            echo "\n<!--\n";
            echo "openpopup('/mod/resource/view.php?inpopup=true&id={$cm->id}','resource{$resource->id}','{$resource->popup}');\n";
            echo "\n-->\n";
            echo '</script>';

            if (trim(strip_tags($resource->summary))) {
                print_simple_box(format_text($resource->summary, FORMAT_MOODLE, $formatoptions), "center");
            }

            $link = "<a href=\"$CFG->wwwroot/mod/resource/view.php?inpopup=true&amp;id={$cm->id}\" target=\"resource{$resource->id}\" onclick=\"return openpopup('/mod/resource/view.php?inpopup=true&amp;id={$cm->id}', 'resource{$resource->id}','{$resource->popup}');\">".format_string($resource->name,true)."</a>";

            echo "<p>&nbsp;</p>";
            echo '<p align="center">';
            print_string('popupresource', 'resource');
            echo '<br />';
            print_string('popupresourcelink', 'resource', $link);
            echo "</p>";

            print_footer($course);
            exit;
        }


    /// No frames or framesets anymore, except iframe. in print_ims, iframe filled.
    /// needs callback to this file to display table of contents in the iframe so
    /// $frameset = 'toc' leads to output of toc and blank or 'ims' produces the
    /// iframe.
        if (empty($frameset) || $frameset=='ims') {

        /// Conditional argument to pass to IMS JavaScript. Need to be global to retrieve it from our custom javascript! :-(
            global $jsarg;
            $jsarg = 'false';
            if (!empty($this->parameters->navigationmenu)) {
                $jsarg = 'true';
            }
        /// Define $CFG->javascript to use our custom javascript. Save the original one to add it from ours. Global too! :-(
            global $standard_javascript;
            $standard_javascript = $CFG->javascript;  // Save original javascript file
            $CFG->javascript = $CFG->dirroot.'/mod/resource/type/ims/javascript.php';  //Use our custom IMS javascript code

        /// moodle header
            if ($resource->popup) {
                //print_header($pagetitle, $course->fullname.' : '.$resource->name);
                print_header();
            } else {
                $navigation = build_navigation($this->navlinks, $cm);
                print_header($pagetitle, $course->fullname, $navigation, "", "", true, update_module_button($cm->id, $course->id, $this->strresource), navmenu($course, $cm, "parent"));
            }
        /// content - this produces everything else
            $this->print_ims($cm, $course, $items, $resource, $page);

            print_footer('empty');

        /// log it.
            add_to_log($course->id, "resource", "view", "view.php?id={$cm->id}", $resource->id, $cm->id);
            exit;
        }

        if ($frameset == 'toc') {
            print_header();
            $this->print_toc($items, $resource, $page);
            echo '</div></div></body></html>';
            exit;
        }
    }

/// Function print_ims prints nearly the whole page. Stupid name subject to change :-)
    function print_ims($cm, $course, $items, $resource, $page) {
        global $CFG;

    /// Set the correct contentframe id based on $this->parameters->navigationmenu
        if (!empty($this->parameters->navigationmenu)) {
            $contentframe = 'ims-contentframe';
        } else {
            $contentframe = 'ims-contentframe-no-nav';
        }

    /// Calculate the file.php correct url
        if (!$this->isrepository) {
            require_once($CFG->libdir.'/filelib.php');
            $fileurl = get_file_url($course->id.'/'.$CFG->moddata.'/resource/'.$resource->id);
        }
        else {
            $fileurl = $CFG->repositorywebroot . $resource->reference;
        }


    /// Calculate the view.php correct url
        $viewurl = "view.php?id={$cm->id}&amp;type={$resource->type}&amp;frameset=toc&amp;page=";


    /// Decide what to show (full toc, partial toc or package file)
        $fullurl = '';
        if (empty($page) && !empty($this->parameters->tableofcontents)) {
        /// Full toc contents
            $fullurl = $viewurl.$page;
        } else {
            if (empty($page)) {
            /// If no page and no toc, set page 1 unless skipping submenus, in which case fast forward:
                $page = 1;
                if (!empty($this->parameters->skipsubmenus)) {
                    while (empty($items[$page]->href) && !empty($items[$page])) {
                        $page++;
                    }
                }
            }
            if (empty($items[$page]->href)) {
            /// The page hasn't href, then partial toc contents
                $fullurl = $viewurl.$page;
            } else {
            /// The page has href, then its own file contents
            /// but considering if it seems to be an external url or a internal one
                if (strpos($items[$page]->href, '//') !== false) {
                /// External URL
                    $fullurl = $items[$page]->href;
                } else {
                /// Internal URL, use file.php
                    $fullurl = $fileurl.'/'.$items[$page]->href;
                }
            }
        }

    /// print navigation buttons if needed
        if (!empty($this->parameters->navigationbuttons)) {
            $this->print_nav($items, $resource, $page);
        }

        echo '<div id="ims-containerdiv">';
    /// adds side navigation bar if needed. must also adjust width of iframe to accomodate
        if (!empty($this->parameters->navigationmenu)) {
            echo "<div id=\"ims-menudiv\">"; $this->print_navmenu($items, $resource, $page); echo "</div>";
        }

    /// prints iframe filled with $fullurl
        echo "<iframe id=\"".$contentframe."\" name=\"".$contentframe."\" src=\"{$fullurl}\" title=\"".get_string('modulename','resource')."\">Your browser does not support inline frames or is currently configured not to display inline frames. Content can be viewed at {$fullurl}</iframe>"; //Content frame
        echo '</div>';
    }

/// Prints TOC
    function print_toc($items, $resource, $page) {
        $table = new stdClass;
        if (empty($page)) {
            $table->head[] = '<b>'.$resource->name.'</b>';
        } else {
            $table->head[] = '<b>'.$items[$page]->title.'</b>';
        }
        $table->data[] = array(ims_generate_toc ($items, $resource, $page));
        $table->width = '60%';
        print_table($table);
    }

/// Prints side navigation menu. This is just the full TOC with no surround.
    function print_navmenu($items, $resource, $page=0) {
        echo ims_generate_toc ($items, $resource, 0, $page);
    }

/// Prints navigation bar at the top of the page.
    function print_nav($items, $resource, $page) {
        echo '<div class="ims-nav-bar" id="ims-nav-bar">';
    /// Prev button
        echo ims_get_prev_nav_button ($items, $this, $page);
    /// Up button
        echo ims_get_up_nav_button ($items, $this, $page);
    /// Next button
        echo ims_get_next_nav_button ($items, $this, $page);
    /// Main TOC button
        echo ims_get_toc_nav_button ($items, $this, $page);
    /// Footer
        echo '</div>';
    }


    function setup_preprocessing(&$defaults){

        if (!isset($defaults['popup'])) {
            // use form defaults