lib/outputrenderers.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * Classes for rendering HTML output for Moodle.
  20  *
  21  * Please see http://docs.moodle.org/en/Developement:How_Moodle_outputs_HTML
  22  * for an overview.
  23  *
  24  * @package    core
  25  * @subpackage lib
  26  * @copyright  2009 Tim Hunt
  27  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  28  */
  29
  30 defined('MOODLE_INTERNAL') || die();
  31
  32 /**
  33  * Simple base class for Moodle renderers.
  34  *
  35  * Tracks the xhtml_container_stack to use, which is passed in in the constructor.
  36  *
  37  * Also has methods to facilitate generating HTML output.
  38  *
  39  * @copyright 2009 Tim Hunt
  40  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  41  * @since     Moodle 2.0
  42  */
  43 class renderer_base {
  44     /** @var xhtml_container_stack the xhtml_container_stack to use. */
  45     protected $opencontainers;
  46     /** @var moodle_page the page we are rendering for. */
  47     protected $page;
  48     /** @var requested rendering target */
  49     protected $target;
  50
  51     /**
  52      * Constructor
  53      * @param moodle_page $page the page we are doing output for.
  54      * @param string $target one of rendering target constants
  55      */
  56     public function __construct(moodle_page $page, $target) {
  57         $this->opencontainers = $page->opencontainers;
  58         $this->page = $page;
  59         $this->target = $target;
  60     }
  61
  62     /**
  63      * Returns rendered widget.
  64      * @param renderable $widget instance with renderable interface
  65      * @return string
  66      */
  67     public function render(renderable $widget) {
  68         $rendermethod = 'render_'.get_class($widget);
  69         if (method_exists($this, $rendermethod)) {
  70             return $this->$rendermethod($widget);
  71         }
  72         throw new coding_exception('Can not render widget, renderer method ('.$rendermethod.') not found.');
  73     }
  74
  75     /**
  76      * Adds JS handlers needed for event execution for one html element id
  77      * @param component_action $actions
  78      * @param string $id
  79      * @return string id of element, either original submitted or random new if not supplied
  80      */
  81     public function add_action_handler(component_action $action, $id=null) {
  82         if (!$id) {
  83             $id = html_writer::random_id($action->event);
  84         }
  85         $this->page->requires->event_handler("#$id", $action->event, $action->jsfunction, $action->jsfunctionargs);
  86         return $id;
  87     }
  88
  89     /**
  90      * Have we started output yet?
  91      * @return boolean true if the header has been printed.
  92      */
  93     public function has_started() {
  94         return $this->page->state >= moodle_page::STATE_IN_BODY;
  95     }
  96
  97     /**
  98      * Given an array or space-separated list of classes, prepares and returns the HTML class attribute value
  99      * @param mixed $classes Space-separated string or array of classes
 100      * @return string HTML class attribute value
 101      */
 102     public static function prepare_classes($classes) {
 103         if (is_array($classes)) {
 104             return implode(' ', array_unique($classes));
 105         }
 106         return $classes;
 107     }
 108
 109     /**
 110      * Return the moodle_url for an image.
 111      * The exact image location and extension is determined
 112      * automatically by searching for gif|png|jpg|jpeg, please
 113      * note there can not be diferent images with the different
 114      * extension. The imagename is for historical reasons
 115      * a relative path name, it may be changed later for core
 116      * images. It is recommended to not use subdirectories
 117      * in plugin and theme pix directories.
 118      *
 119      * There are three types of images:
 120      * 1/ theme images  - stored in theme/mytheme/pix/,
 121      *                    use component 'theme'
 122      * 2/ core images   - stored in /pix/,
 123      *                    overridden via theme/mytheme/pix_core/
 124      * 3/ plugin images - stored in mod/mymodule/pix,
 125      *                    overridden via theme/mytheme/pix_plugins/mod/mymodule/,
 126      *                    example: pix_url('comment', 'mod_glossary')
 127      *
 128      * @param string $imagename the pathname of the image
 129      * @param string $component full plugin name (aka component) or 'theme'
 130      * @return moodle_url
 131      */
 132     public function pix_url($imagename, $component = 'moodle') {
 133         return $this->page->theme->pix_url($imagename, $component);
 134     }
 135 }
 136
 137
 138 /**
 139  * Basis for all plugin renderers.
 140  *
 141  * @author    Petr Skoda (skodak)
 142  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 143  * @since     Moodle 2.0
 144  */
 145 class plugin_renderer_base extends renderer_base {
 146     /**
 147      * A reference to the current general renderer probably {@see core_renderer}
 148      * @var renderer_base
 149      */
 150     protected $output;
 151
 152     /**
 153      * Constructor method, calls the parent constructor
 154      * @param moodle_page $page
 155      * @param string $target one of rendering target constants
 156      */
 157     public function __construct(moodle_page $page, $target) {
 158         $this->output = $page->get_renderer('core', null, $target);
 159         parent::__construct($page, $target);
 160     }
 161
 162     /**
 163      * Returns rendered widget.
 164      * @param renderable $widget instance with renderable interface
 165      * @return string
 166      */
 167     public function render(renderable $widget) {
 168         $rendermethod = 'render_'.get_class($widget);
 169         if (method_exists($this, $rendermethod)) {
 170             return $this->$rendermethod($widget);
 171         }
 172         // pass to core renderer if method not found here
 173         return $this->output->render($widget);
 174     }
 175
 176     /**
 177      * Magic method used to pass calls otherwise meant for the standard renderer
 178      * to it to ensure we don't go causing unnecessary grief.
 179      *
 180      * @param string $method
 181      * @param array $arguments
 182      * @return mixed
 183      */
 184     public function __call($method, $arguments) {
 185         if (method_exists('renderer_base', $method)) {
 186             throw new coding_exception('Protected method called against '.__CLASS__.' :: '.$method);
 187         }
 188         if (method_exists($this->output, $method)) {
 189             return call_user_func_array(array($this->output, $method), $arguments);
 190         } else {
 191             throw new coding_exception('Unknown method called against '.__CLASS__.' :: '.$method);
 192         }
 193     }
 194 }
 195
 196
 197 /**
 198  * The standard implementation of the core_renderer interface.
 199  *
 200  * @copyright 2009 Tim Hunt
 201  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 202  * @since     Moodle 2.0
 203  */
 204 class core_renderer extends renderer_base {
 205     /** @var string used in {@link header()}. */
 206     const PERFORMANCE_INFO_TOKEN = '%%PERFORMANCEINFO%%';
 207     /** @var string used in {@link header()}. */
 208     const END_HTML_TOKEN = '%%ENDHTML%%';
 209     /** @var string used in {@link header()}. */
 210     const MAIN_CONTENT_TOKEN = '[MAIN CONTENT GOES HERE]';
 211     /** @var string used to pass information from {@link doctype()} to {@link standard_head_html()}. */
 212     protected $contenttype;
 213     /** @var string used by {@link redirect_message()} method to communicate with {@link header()}. */
 214     protected $metarefreshtag = '';
 215
 216     /**
 217      * Get the DOCTYPE declaration that should be used with this page. Designed to
 218      * be called in theme layout.php files.
 219      * @return string the DOCTYPE declaration (and any XML prologue) that should be used.
 220      */
 221     public function doctype() {
 222         global $CFG;
 223
 224         $doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">' . "\n";
 225         $this->contenttype = 'text/html; charset=utf-8';
 226
 227         if (empty($CFG->xmlstrictheaders)) {
 228             return $doctype;
 229         }
 230
 231         // We want to serve the page with an XML content type, to force well-formedness errors to be reported.
 232         $prolog = '<?xml version="1.0" encoding="utf-8"?>' . "\n";
 233         if (isset($_SERVER['HTTP_ACCEPT']) && strpos($_SERVER['HTTP_ACCEPT'], 'application/xhtml+xml') !== false) {
 234             // Firefox and other browsers that can cope natively with XHTML.
 235             $this->contenttype = 'application/xhtml+xml; charset=utf-8';
 236
 237         } else if (preg_match('/MSIE.*Windows NT/', $_SERVER['HTTP_USER_AGENT'])) {
 238             // IE can't cope with application/xhtml+xml, but it will cope if we send application/xml with an XSL stylesheet.
 239             $this->contenttype = 'application/xml; charset=utf-8';
 240             $prolog .= '<?xml-stylesheet type="text/xsl" href="' . $CFG->httpswwwroot . '/lib/xhtml.xsl"?>' . "\n";
 241
 242         } else {
 243             $prolog = '';
 244         }
 245
 246         return $prolog . $doctype;
 247     }
 248
 249     /**
 250      * The attributes that should be added to the <html> tag. Designed to
 251      * be called in theme layout.php files.
 252      * @return string HTML fragment.
 253      */
 254     public function htmlattributes() {
 255         return get_html_lang(true) . ' xmlns="http://www.w3.org/1999/xhtml"';
 256     }
 257
 258     /**
 259      * The standard tags (meta tags, links to stylesheets and JavaScript, etc.)
 260      * that should be included in the <head> tag. Designed to be called in theme
 261      * layout.php files.
 262      * @return string HTML fragment.
 263      */
 264     public function standard_head_html() {
 265         global $CFG, $SESSION;
 266         $output = '';
 267         $output .= '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />' . "\n";
 268         $output .= '<meta name="keywords" content="moodle, ' . $this->page->title . '" />' . "\n";
 269         if (!$this->page->cacheable) {
 270             $output .= '<meta http-equiv="pragma" content="no-cache" />' . "\n";
 271             $output .= '<meta http-equiv="expires" content="0" />' . "\n";
 272         }
 273         // This is only set by the {@link redirect()} method
 274         $output .= $this->metarefreshtag;
 275
 276         // Check if a periodic refresh delay has been set and make sure we arn't
 277         // already meta refreshing
 278         if ($this->metarefreshtag=='' && $this->page->periodicrefreshdelay!==null) {
 279             $output .= '<meta http-equiv="refresh" content="'.$this->page->periodicrefreshdelay.';url='.$this->page->url->out().'" />';
 280         }
 281
 282         // flow player embedding support
 283         $this->page->requires->js_function_call('M.util.load_flowplayer');
 284
 285         $this->page->requires->js_function_call('setTimeout', array('fix_column_widths()', 20));
 286
 287         $focus = $this->page->focuscontrol;
 288         if (!empty($focus)) {
 289             if (preg_match("#forms\['([a-zA-Z0-9]+)'\].elements\['([a-zA-Z0-9]+)'\]#", $focus, $matches)) {
 290                 // This is a horrifically bad way to handle focus but it is passed in
 291                 // through messy formslib::moodleform
 292                 $this->page->requires->js_function_call('old_onload_focus', array($matches[1], $matches[2]));
 293             } else if (strpos($focus, '.')!==false) {
 294                 // Old style of focus, bad way to do it
 295                 debugging('This code is using the old style focus event, Please update this code to focus on an element id or the moodleform focus method.', DEBUG_DEVELOPER);
 296                 $this->page->requires->js_function_call('old_onload_focus', explode('.', $focus, 2));
 297             } else {
 298                 // Focus element with given id
 299                 $this->page->requires->js_function_call('focuscontrol', array($focus));
 300             }
 301         }
 302
 303         // Get the theme stylesheet - this has to be always first CSS, this loads also styles.css from all plugins;
 304         // any other custom CSS can not be overridden via themes and is highly discouraged
 305         $urls = $this->page->theme->css_urls($this->page);
 306         foreach ($urls as $url) {
 307             $this->page->requires->css_theme($url);
 308         }
 309
 310         // Get the theme javascript head and footer
 311         $jsurl = $this->page->theme->javascript_url(true);
 312         $this->page->requires->js($jsurl, true);
 313         $jsurl = $this->page->theme->javascript_url(false);
 314         $this->page->requires->js($jsurl);
 315
 316         // Perform a browser environment check for the flash version.  Should only run once per login session.
 317         if (!NO_MOODLE_COOKIES && isloggedin() && !empty($CFG->excludeoldflashclients) && empty($SESSION->flashversion)) {
 318             $this->page->requires->js('/lib/swfobject/swfobject.js');
 319             $this->page->requires->js_init_call('M.core_flashdetect.init');
 320         }
 321
 322         // Get any HTML from the page_requirements_manager.
 323         $output .= $this->page->requires->get_head_code($this->page, $this);
 324
 325         // List alternate versions.
 326         foreach ($this->page->alternateversions as $type => $alt) {
 327             $output .= html_writer::empty_tag('link', array('rel' => 'alternate',
 328                     'type' => $type, 'title' => $alt->title, 'href' => $alt->url));
 329         }
 330
 331         if (!empty($CFG->additionalhtmlhead)) {
 332             $output .= "\n".$CFG->additionalhtmlhead;
 333         }
 334
 335         return $output;
 336     }
 337
 338     /**
 339      * The standard tags (typically skip links) that should be output just inside
 340      * the start of the <body> tag. Designed to be called in theme layout.php files.
 341      * @return string HTML fragment.
 342      */
 343     public function standard_top_of_body_html() {
 344         global $CFG;
 345         $output = $this->page->requires->get_top_of_body_code();
 346         if (!empty($CFG->additionalhtmltopofbody)) {
 347             $output .= "\n".$CFG->additionalhtmltopofbody;
 348         }
 349         return $output;
 350     }
 351
 352     /**
 353      * The standard tags (typically performance information and validation links,
 354      * if we are in developer debug mode) that should be output in the footer area
 355      * of the page. Designed to be called in theme layout.php files.
 356      * @return string HTML fragment.
 357      */
 358     public function standard_footer_html() {
 359         global $CFG, $SCRIPT;
 360
 361         // This function is normally called from a layout.php file in {@link header()}
 362         // but some of the content won't be known until later, so we return a placeholder
 363         // for now. This will be replaced with the real content in {@link footer()}.
 364         $output = self::PERFORMANCE_INFO_TOKEN;
 365         if ($this->page->legacythemeinuse) {
 366             // The legacy theme is in use print the notification
 367             $output .= html_writer::tag('div', get_string('legacythemeinuse'), array('class'=>'legacythemeinuse'));
 368         }
 369         if (!empty($CFG->debugpageinfo)) {
 370             $output .= '<div class="performanceinfo pageinfo">This page is: ' . $this->page->debug_summary() . '</div>';
 371         }
 372         if (debugging(null, DEBUG_DEVELOPER) and has_capability('moodle/site:config', get_context_instance(CONTEXT_SYSTEM))) {  // Only in developer mode
 373             // Add link to profiling report if necessary
 374             if (function_exists('profiling_is_running') && profiling_is_running()) {
 375                 $txt = get_string('profiledscript', 'admin');
 376                 $title = get_string('profiledscriptview', 'admin');
 377                 $url = $CFG->wwwroot . '/admin/report/profiling/index.php?script=' . urlencode($SCRIPT);
 378                 $link= '<a title="' . $title . '" href="' . $url . '">' . $txt . '</a>';
 379                 $output .= '<div class="profilingfooter">' . $link . '</div>';
 380             }
 381             $output .= '<div class="purgecaches"><a href="'.$CFG->wwwroot.'/admin/purgecaches.php?confirm=1&amp;sesskey='.sesskey().'">'.get_string('purgecaches', 'admin').'</a></div>';
 382         }
 383         if (!empty($CFG->debugvalidators)) {
 384             $output .= '<div class="validators"><ul>
 385               <li><a href="http://validator.w3.org/check?verbose=1&amp;ss=1&amp;uri=' . urlencode(qualified_me()) . '">Validate HTML</a></li>
 386               <li><a href="http://www.contentquality.com/mynewtester/cynthia.exe?rptmode=-1&amp;url1=' . urlencode(qualified_me()) . '">Section 508 Check</a></li>
 387               <li><a href="http://www.contentquality.com/mynewtester/cynthia.exe?rptmode=0&amp;warnp2n3e=1&amp;url1=' . urlencode(qualified_me()) . '">WCAG 1 (2,3) Check</a></li>
 388             </ul></div>';
 389         }
 390         if (!empty($CFG->additionalhtmlfooter)) {
 391             $output .= "\n".$CFG->additionalhtmlfooter;
 392         }
 393         return $output;
 394     }
 395
 396     /**
 397      * The standard tags (typically script tags that are not needed earlier) that
 398      * should be output after everything else, . Designed to be called in theme layout.php files.
 399      * @return string HTML fragment.
 400      */
 401     public function standard_end_of_body_html() {
 402         // This function is normally called from a layout.php file in {@link header()}
 403         // but some of the content won't be known until later, so we return a placeholder
 404         // for now. This will be replaced with the real content in {@link footer()}.
 405         return self::END_HTML_TOKEN;
 406     }
 407
 408     /**
 409      * Return the standard string that says whether you are logged in (and switched
 410      * roles/logged in as another user).
 411      * @return string HTML fragment.
 412      */
 413     public function login_info() {
 414         global $USER, $CFG, $DB, $SESSION;
 415
 416         if (during_initial_install()) {
 417             return '';
 418         }
 419
 420         $loginapge = ((string)$this->page->url === get_login_url());
 421         $course = $this->page->course;
 422
 423         if (session_is_loggedinas()) {
 424             $realuser = session_get_realuser();
 425             $fullname = fullname($realuser, true);
 426             $realuserinfo = " [<a href=\"$CFG->wwwroot/course/loginas.php?id=$course->id&amp;sesskey=".sesskey()."\">$fullname</a>] ";
 427         } else {
 428             $realuserinfo = '';
 429         }
 430
 431         $loginurl = get_login_url();
 432
 433         if (empty($course->id)) {
 434             // $course->id is not defined during installation
 435             return '';
 436         } else if (isloggedin()) {
 437             $context = get_context_instance(CONTEXT_COURSE, $course->id);
 438
 439             $fullname = fullname($USER, true);
 440             // Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
 441             $username = "<a href=\"$CFG->wwwroot/user/profile.php?id=$USER->id\">$fullname</a>";
 442             if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id'=>$USER->mnethostid))) {
 443                 $username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
 444             }
 445             if (isguestuser()) {
 446                 $loggedinas = $realuserinfo.get_string('loggedinasguest');
 447                 if (!$loginapge) {
 448                     $loggedinas .= " (<a href=\"$loginurl\">".get_string('login').'</a>)';
 449                 }
 450             } else if (is_role_switched($course->id)) { // Has switched roles
 451                 $rolename = '';
 452                 if ($role = $DB->get_record('role', array('id'=>$USER->access['rsw'][$context->path]))) {
 453                     $rolename = ': '.format_string($role->name);
 454                 }
 455                 $loggedinas = get_string('loggedinas', 'moodle', $username).$rolename.
 456                           " (<a href=\"$CFG->wwwroot/course/view.php?id=$course->id&amp;switchrole=0&amp;sesskey=".sesskey()."\">".get_string('switchrolereturn').'</a>)';
 457             } else {
 458                 $loggedinas = $realuserinfo.get_string('loggedinas', 'moodle', $username).' '.
 459                           " (<a href=\"$CFG->wwwroot/login/logout.php?sesskey=".sesskey()."\">".get_string('logout').'</a>)';
 460             }
 461         } else {
 462             $loggedinas = get_string('loggedinnot', 'moodle');
 463             if (!$loginapge) {
 464                 $loggedinas .= " (<a href=\"$loginurl\">".get_string('login').'</a>)';
 465             }
 466         }
 467
 468         $loggedinas = '<div class="logininfo">'.$loggedinas.'</div>';
 469
 470         if (isset($SESSION->justloggedin)) {
 471             unset($SESSION->justloggedin);
 472             if (!empty($CFG->displayloginfailures)) {
 473                 if (!isguestuser()) {
 474                     if ($count = count_login_failures($CFG->displayloginfailures, $USER->username, $USER->lastlogin)) {
 475                         $loggedinas .= '&nbsp;<div class="loginfailures">';
 476                         if (empty($count->accounts)) {
 477                             $loggedinas .= get_string('failedloginattempts', '', $count);
 478                         } else {
 479                             $loggedinas .= get_string('failedloginattemptsall', '', $count);
 480                         }
 481                         if (has_capability('coursereport/log:view', get_context_instance(CONTEXT_SYSTEM))) {
 482                             $loggedinas .= ' (<a href="'.$CFG->wwwroot.'/course/report/log/index.php'.
 483                                                  '?chooselog=1&amp;id=1&amp;modid=site_errors">'.get_string('logs').'</a>)';
 484                         }
 485                         $loggedinas .= '</div>';
 486                     }
 487                 }
 488             }
 489         }
 490
 491         return $loggedinas;
 492     }
 493
 494     /**
 495      * Return the 'back' link that normally appears in the footer.
 496      * @return string HTML fragment.
 497      */
 498     public function home_link() {
 499         global $CFG, $SITE;
 500
 501         if ($this->page->pagetype == 'site-index') {
 502             // Special case for site home page - please do not remove
 503             return '<div class="sitelink">' .
 504                    '<a title="Moodle" href="http://moodle.org/">' .
 505                    '<img style="width:100px;height:30px" src="' . $this->pix_url('moodlelogo') . '" alt="moodlelogo" /></a></div>';
 506
 507         } else if (!empty($CFG->target_release) && $CFG->target_release != $CFG->release) {
 508             // Special case for during install/upgrade.
 509             return '<div class="sitelink">'.
 510                    '<a title="Moodle" href="http://docs.moodle.org/en/Administrator_documentation" onclick="this.target=\'_blank\'">' .
 511                    '<img style="width:100px;height:30px" src="' . $this->pix_url('moodlelogo') . '" alt="moodlelogo" /></a></div>';
 512
 513         } else if ($this->page->course->id == $SITE->id || strpos($this->page->pagetype, 'course-view') === 0) {
 514             return '<div class="homelink"><a href="' . $CFG->wwwroot . '/">' .
 515                     get_string('home') . '</a></div>';
 516
 517         } else {
 518             return '<div class="homelink"><a href="' . $CFG->wwwroot . '/course/view.php?id=' . $this->page->course->id . '">' .
 519                     format_string($this->page->course->shortname) . '</a></div>';
 520         }
 521     }
 522
 523     /**
 524      * Redirects the user by any means possible given the current state
 525      *
 526      * This function should not be called directly, it should always be called using
 527      * the redirect function in lib/weblib.php
 528      *
 529      * The redirect function should really only be called before page output has started
 530      * however it will allow itself to be called during the state STATE_IN_BODY
 531      *
 532      * @param string $encodedurl The URL to send to encoded if required
 533      * @param string $message The message to display to the user if any
 534      * @param int $delay The delay before redirecting a user, if $message has been
 535      *         set this is a requirement and defaults to 3, set to 0 no delay
 536      * @param boolean $debugdisableredirect this redirect has been disabled for
 537      *         debugging purposes. Display a message that explains, and don't
 538      *         trigger the redirect.
 539      * @return string The HTML to display to the user before dying, may contain
 540      *         meta refresh, javascript refresh, and may have set header redirects
 541      */
 542     public function redirect_message($encodedurl, $message, $delay, $debugdisableredirect) {
 543         global $CFG;
 544         $url = str_replace('&amp;', '&', $encodedurl);
 545
 546         switch ($this->page->state) {
 547             case moodle_page::STATE_BEFORE_HEADER :
 548                 // No output yet it is safe to delivery the full arsenal of redirect methods
 549                 if (!$debugdisableredirect) {
 550                     // Don't use exactly the same time here, it can cause problems when both redirects fire at the same time.
 551                     $this->metarefreshtag = '<meta http-equiv="refresh" content="'. $delay .'; url='. $encodedurl .'" />'."\n";
 552                     $this->page->requires->js_function_call('document.location.replace', array($url), false, ($delay + 3));
 553                 }
 554                 $output = $this->header();
 555                 break;
 556             case moodle_page::STATE_PRINTING_HEADER :
 557                 // We should hopefully never get here
 558                 throw new coding_exception('You cannot redirect while printing the page header');
 559                 break;
 560             case moodle_page::STATE_IN_BODY :
 561                 // We really shouldn't be here but we can deal with this
 562                 debugging("You should really redirect before you start page output");
 563                 if (!$debugdisableredirect) {
 564                     $this->page->requires->js_function_call('document.location.replace', array($url), false, $delay);
 565                 }
 566                 $output = $this->opencontainers->pop_all_but_last();
 567                 break;
 568             case moodle_page::STATE_DONE :
 569                 // Too late to be calling redirect now
 570                 throw new coding_exception('You cannot redirect after the entire page has been generated');
 571                 break;
 572         }
 573         $output .= $this->notification($message, 'redirectmessage');
 574         $output .= '<div class="continuebutton">(<a href="'. $encodedurl .'">'. get_string('continue') .'</a>)</div>';
 575         if ($debugdisableredirect) {
 576             $output .= '<p><strong>Error output, so disabling automatic redirect.</strong></p>';
 577         }
 578         $output .= $this->footer();
 579         return $output;
 580     }
 581
 582     /**
 583      * Start output by sending the HTTP headers, and printing the HTML <head>
 584      * and the start of the <body>.
 585      *
 586      * To control what is printed, you should set properties on $PAGE. If you
 587      * are familiar with the old {@link print_header()} function from Moodle 1.9
 588      * you will find that there are properties on $PAGE that correspond to most
 589      * of the old parameters to could be passed to print_header.
 590      *
 591      * Not that, in due course, the remaining $navigation, $menu parameters here
 592      * will be replaced by more properties of $PAGE, but that is still to do.
 593      *
 594      * @return string HTML that you must output this, preferably immediately.
 595      */
 596     public function header() {
 597         global $USER, $CFG;
 598
 599         if (session_is_loggedinas()) {
 600             $this->page->add_body_class('userloggedinas');
 601         }
 602
 603         $this->page->set_state(moodle_page::STATE_PRINTING_HEADER);
 604
 605         // Find the appropriate page layout file, based on $this->page->pagelayout.
 606         $layoutfile = $this->page->theme->layout_file($this->page->pagelayout);
 607         // Render the layout using the layout file.
 608         $rendered = $this->render_page_layout($layoutfile);
 609
 610         // Slice the rendered output into header and footer.
 611         $cutpos = strpos($rendered, self::MAIN_CONTENT_TOKEN);
 612         if ($cutpos === false) {
 613             throw new coding_exception('page layout file ' . $layoutfile .
 614                     ' does not contain the string "' . self::MAIN_CONTENT_TOKEN . '".');
 615         }
 616         $header = substr($rendered, 0, $cutpos);
 617         $footer = substr($rendered, $cutpos + strlen(self::MAIN_CONTENT_TOKEN));
 618
 619         if (empty($this->contenttype)) {
 620             debugging('The page layout file did not call $OUTPUT->doctype()');
 621             $header = $this->doctype() . $header;
 622         }
 623
 624         send_headers($this->contenttype, $this->page->cacheable);
 625
 626         $this->opencontainers->push('header/footer', $footer);
 627         $this->page->set_state(moodle_page::STATE_IN_BODY);
 628
 629         return $header . $this->skip_link_target('maincontent');
 630     }
 631
 632     /**
 633      * Renders and outputs the page layout file.
 634      * @param string $layoutfile The name of the layout file
 635      * @return string HTML code
 636      */
 637     protected function render_page_layout($layoutfile) {
 638         global $CFG, $SITE, $USER;
 639         // The next lines are a bit tricky. The point is, here we are in a method
 640         // of a renderer class, and this object may, or may not, be the same as
 641         // the global $OUTPUT object. When rendering the page layout file, we want to use
 642         // this object. However, people writing Moodle code expect the current
 643         // renderer to be called $OUTPUT, not $this, so define a variable called
 644         // $OUTPUT pointing at $this. The same comment applies to $PAGE and $COURSE.
 645         $OUTPUT = $this;
 646         $PAGE = $this->page;
 647         $COURSE = $this->page->course;
 648
 649         ob_start();
 650         include($layoutfile);
 651         $rendered = ob_get_contents();
 652         ob_end_clean();
 653         return $rendered;
 654     }
 655
 656     /**
 657      * Outputs the page's footer
 658      * @return string HTML fragment
 659      */
 660     public function footer() {
 661         global $CFG, $DB;
 662
 663         $output = $this->container_end_all(true);
 664
 665         $footer = $this->opencontainers->pop('header/footer');
 666
 667         if (debugging() and $DB and $DB->is_transaction_started()) {
 668             // TODO: MDL-20625 print warning - transaction will be rolled back
 669         }
 670
 671         // Provide some performance info if required
 672         $performanceinfo = '';
 673         if (defined('MDL_PERF') || (!empty($CFG->perfdebug) and $CFG->perfdebug > 7)) {
 674             $perf = get_performance_info();
 675             if (defined('MDL_PERFTOLOG') && !function_exists('register_shutdown_function')) {
 676                 error_log("PERF: " . $perf['txt']);
 677             }
 678             if (defined('MDL_PERFTOFOOT') || debugging() || $CFG->perfdebug > 7) {
 679                 $performanceinfo = $perf['html'];
 680             }
 681         }
 682         $footer = str_replace(self::PERFORMANCE_INFO_TOKEN, $performanceinfo, $footer);
 683
 684         $footer = str_replace(self::END_HTML_TOKEN, $this->page->requires->get_end_code(), $footer);
 685
 686         $this->page->set_state(moodle_page::STATE_DONE);
 687
 688         return $output . $footer;
 689     }
 690
 691     /**
 692      * Close all but the last open container. This is useful in places like error
 693      * handling, where you want to close all the open containers (apart from <body>)
 694      * before outputting the error message.
 695      * @param bool $shouldbenone assert that the stack should be empty now - causes a
 696      *      developer debug warning if it isn't.
 697      * @return string the HTML required to close any open containers inside <body>.
 698      */
 699     public function container_end_all($shouldbenone = false) {
 700         return $this->opencontainers->pop_all_but_last($shouldbenone);
 701     }
 702
 703     /**
 704      * Returns lang menu or '', this method also checks forcing of languages in courses.
 705      * @return string
 706      */
 707     public function lang_menu() {
 708         global $CFG;
 709
 710         if (empty($CFG->langmenu)) {
 711             return '';
 712         }
 713
 714         if ($this->page->course != SITEID and !empty($this->page->course->lang)) {
 715             // do not show lang menu if language forced
 716             return '';
 717         }
 718
 719         $currlang = current_language();
 720         $langs = get_string_manager()->get_list_of_translations();
 721
 722         if (count($langs) < 2) {
 723             return '';
 724         }
 725
 726         $s = new single_select($this->page->url, 'lang', $langs, $currlang, null);
 727         $s->label = get_accesshide(get_string('language'));
 728         $s->class = 'langmenu';
 729         return $this->render($s);
 730     }
 731
 732     /**
 733      * Output the row of editing icons for a block, as defined by the controls array.
 734      * @param array $controls an array like {@link block_contents::$controls}.
 735      * @return HTML fragment.
 736      */
 737     public function block_controls($controls) {
 738         if (empty($controls)) {
 739             return '';
 740         }
 741         $controlshtml = array();
 742         foreach ($controls as $control) {
 743             $controlshtml[] = html_writer::tag('a',
 744                     html_writer::empty_tag('img',  array('src' => $this->pix_url($control['icon'])->out(false), 'alt' => $control['caption'])),
 745                     array('class' => 'icon','title' => $control['caption'], 'href' => $control['url']));
 746         }
 747         return html_writer::tag('div', implode('', $controlshtml), array('class' => 'commands'));
 748     }
 749
 750     /**
 751      * Prints a nice side block with an optional header.
 752      *
 753      * The content is described
 754      * by a {@link block_contents} object.
 755      *
 756      * <div id="inst{$instanceid}" class="block_{$blockname} block">
 757      *      <div class="header"></div>
 758      *      <div class="content">
 759      *          ...CONTENT...
 760      *          <div class="footer">
 761      *          </div>
 762      *      </div>
 763      *      <div class="annotation">
 764      *      </div>
 765      * </div>
 766      *
 767      * @param block_contents $bc HTML for the content
 768      * @param string $region the region the block is appearing in.
 769      * @return string the HTML to be output.
 770      */
 771     function block(block_contents $bc, $region) {
 772         $bc = clone($bc); // Avoid messing up the object passed in.
 773         if (empty($bc->blockinstanceid) || !strip_tags($bc->title)) {
 774             $bc->collapsible = block_contents::NOT_HIDEABLE;
 775         }
 776         if ($bc->collapsible == block_contents::HIDDEN) {
 777             $bc->add_class('hidden');
 778         }
 779         if (!empty($bc->controls)) {
 780             $bc->add_class('block_with_controls');
 781         }
 782
 783         $skiptitle = strip_tags($bc->title);
 784         if (empty($skiptitle)) {
 785             $output = '';
 786             $skipdest = '';
 787         } else {
 788             $output = html_writer::tag('a', get_string('skipa', 'access', $skiptitle), array('href' => '#sb-' . $bc->skipid, 'class' => 'skip-block'));
 789             $skipdest = html_writer::tag('span', '', array('id' => 'sb-' . $bc->skipid, 'class' => 'skip-block-to'));
 790         }
 791
 792         $output .= html_writer::start_tag('div', $bc->attributes);
 793
 794         $output .= $this->block_header($bc);
 795         $output .= $this->block_content($bc);
 796
 797         $output .= html_writer::end_tag('div');
 798
 799         $output .= $this->block_annotation($bc);
 800
 801         $output .= $skipdest;
 802
 803         $this->init_block_hider_js($bc);
 804         return $output;
 805     }
 806
 807     /**
 808      * Produces a header for a block
 809      *
 810      * @param block_contents $bc
 811      * @return string
 812      */
 813     protected function block_header(block_contents $bc) {
 814
 815         $title = '';
 816         if ($bc->title) {
 817             $title = html_writer::tag('h2', $bc->title, null);
 818         }
 819
 820         $controlshtml = $this->block_controls($bc->controls);
 821
 822         $output = '';
 823         if ($title || $controlshtml) {
 824             $output .= html_writer::tag('div', html_writer::tag('div', html_writer::tag('div', '', array('class'=>'block_action')). $title . $controlshtml, array('class' => 'title')), array('class' => 'header'));
 825         }
 826         return $output;
 827     }
 828
 829     /**
 830      * Produces the content area for a block
 831      *
 832      * @param block_contents $bc
 833      * @return string
 834      */
 835     protected function block_content(block_contents $bc) {
 836         $output = html_writer::start_tag('div', array('class' => 'content'));
 837         if (!$bc->title && !$this->block_controls($bc->controls)) {
 838             $output .= html_writer::tag('div', '', array('class'=>'block_action notitle'));
 839         }
 840         $output .= $bc->content;
 841         $output .= $this->block_footer($bc);
 842         $output .= html_writer::end_tag('div');
 843
 844         return $output;
 845     }
 846
 847     /**
 848      * Produces the footer for a block
 849      *
 850      * @param block_contents $bc
 851      * @return string
 852      */
 853     protected function block_footer(block_contents $bc) {
 854         $output = '';
 855         if ($bc->footer) {
 856             $output .= html_writer::tag('div', $bc->footer, array('class' => 'footer'));
 857         }
 858         return $output;
 859     }
 860
 861     /**
 862      * Produces the annotation for a block
 863      *
 864      * @param block_contents $bc
 865      * @return string
 866      */
 867     protected function block_annotation(block_contents $bc) {
 868         $output = '';
 869         if ($bc->annotation) {
 870             $output .= html_writer::tag('div', $bc->annotation, array('class' => 'blockannotation'));
 871         }
 872         return $output;
 873     }
 874
 875     /**
 876      * Calls the JS require function to hide a block.
 877      * @param block_contents $bc A block_contents object
 878      * @return void
 879      */
 880     protected function init_block_hider_js(block_contents $bc) {
 881         if (!empty($bc->attributes['id']) and $bc->collapsible != block_contents::NOT_HIDEABLE) {
 882             $config = new stdClass;
 883             $config->id = $bc->attributes['id'];
 884             $config->title = strip_tags($bc->title);
 885             $config->preference = 'block' . $bc->blockinstanceid . 'hidden';
 886             $config->tooltipVisible = get_string('hideblocka', 'access', $config->title);
 887             $config->tooltipHidden = get_string('showblocka', 'access', $config->title);
 888
 889             $this->page->requires->js_init_call('M.util.init_block_hider', array($config));
 890             user_preference_allow_ajax_update($config->preference, PARAM_BOOL);
 891         }
 892     }
 893
 894     /**
 895      * Render the contents of a block_list.
 896      * @param array $icons the icon for each item.
 897      * @param array $items the content of each item.
 898      * @return string HTML
 899      */
 900     public function list_block_contents($icons, $items) {
 901         $row = 0;
 902         $lis = array();
 903         foreach ($items as $key => $string) {
 904             $item = html_writer::start_tag('li', array('class' => 'r' . $row));
 905             if (!empty($icons[$key])) { //test if the content has an assigned icon
 906                 $item .= html_writer::tag('div', $icons[$key], array('class' => 'icon column c0'));
 907             }
 908             $item .= html_writer::tag('div', $string, array('class' => 'column c1'));
 909             $item .= html_writer::end_tag('li');
 910             $lis[] = $item;
 911             $row = 1 - $row; // Flip even/odd.
 912         }
 913         return html_writer::tag('ul', implode("\n", $lis), array('class' => 'unlist'));
 914     }
 915
 916     /**
 917      * Output all the blocks in a particular region.
 918      * @param string $region the name of a region on this page.
 919      * @return string the HTML to be output.
 920      */
 921     public function blocks_for_region($region) {
 922         $blockcontents = $this->page->blocks->get_content_for_region($region, $this);
 923
 924         $output = '';
 925         foreach ($blockcontents as $bc) {
 926             if ($bc instanceof block_contents) {
 927                 $output .= $this->block($bc, $region);
 928             } else if ($bc instanceof block_move_target) {
 929                 $output .= $this->block_move_target($bc);
 930             } else {
 931                 throw new coding_exception('Unexpected type of thing (' . get_class($bc) . ') found in list of block contents.');
 932             }
 933         }
 934         return $output;
 935     }
 936
 937     /**
 938      * Output a place where the block that is currently being moved can be dropped.
 939      * @param block_move_target $target with the necessary details.
 940      * @return string the HTML to be output.
 941      */
 942     public function block_move_target($target) {
 943         return html_writer::tag('a', html_writer::tag('span', $target->text, array('class' => 'accesshide')), array('href' => $target->url, 'class' => 'blockmovetarget'));
 944     }
 945
 946     /**
 947      * Renders a special html link with attached action
 948      *
 949      * @param string|moodle_url $url
 950      * @param string $text HTML fragment
 951      * @param component_action $action
 952      * @param array $attributes associative array of html link attributes + disabled
 953      * @return HTML fragment
 954      */
 955     public function action_link($url, $text, component_action $action = null, array $attributes=null) {
 956         if (!($url instanceof moodle_url)) {
 957             $url = new moodle_url($url);
 958         }
 959         $link = new action_link($url, $text, $action, $attributes);
 960
 961         return $this->render($link);
 962     }
 963
 964     /**
 965      * Implementation of action_link rendering
 966      * @param action_link $link
 967      * @return string HTML fragment
 968      */
 969     protected function render_action_link(action_link $link) {
 970         global $CFG;
 971
 972         // A disabled link is rendered as formatted text
 973         if (!empty($link->attributes['disabled'])) {
 974             // do not use div here due to nesting restriction in xhtml strict
 975             return html_writer::tag('span', $link->text, array('class'=>'currentlink'));
 976         }
 977
 978         $attributes = $link->attributes;
 979         unset($link->attributes['disabled']);
 980         $attributes['href'] = $link->url;
 981
 982         if ($link->actions) {
 983             if (empty($attributes['id'])) {
 984                 $id = html_writer::random_id('action_link');
 985                 $attributes['id'] = $id;
 986             } else {
 987                 $id = $attributes['id'];
 988             }
 989             foreach ($link->actions as $action) {
 990                 $this->add_action_handler($action, $id);
 991             }
 992         }
 993
 994         return html_writer::tag('a', $link->text, $attributes);
 995     }
 996
 997
 998     /**
 999      * Similar to action_link, image is used instead of the text
1000      *
1001      * @param string|moodle_url $url A string URL or moodel_url
1002      * @param pix_icon $pixicon
1003      * @param component_action $action
1004      * @param array $attributes associative array of html link attributes + disabled
1005      * @param bool $linktext show title next to image in link
1006      * @return string HTML fragment
1007      */
1008     public function action_icon($url, pix_icon $pixicon, component_action $action = null, array $attributes = null, $linktext=false) {
1009         if (!($url instanceof moodle_url)) {
1010             $url = new moodle_url($url);
1011         }
1012         $attributes = (array)$attributes;
1013
1014         if (empty($attributes['class'])) {
1015             // let ppl override the class via $options
1016             $attributes['class'] = 'action-icon';
1017         }
1018
1019         $icon = $this->render($pixicon);
1020
1021         if ($linktext) {
1022             $text = $pixicon->attributes['alt'];
1023         } else {
1024             $text = '';
1025         }
1026
1027         return $this->action_link($url, $text.$icon, $action, $attributes);
1028     }
1029
1030    /**
1031     * Print a message along with button choices for Continue/Cancel
1032     *
1033     * If a string or moodle_url is given instead of a single_button, method defaults to post.
1034     *
1035     * @param string $message The question to ask the user
1036     * @param single_button|moodle_url|string $continue The single_button component representing the Continue answer. Can also be a moodle_url or string URL
1037     * @param single_button|moodle_url|string $cancel The single_button component representing the Cancel answer. Can also be a moodle_url or string URL
1038     * @return string HTML fragment
1039     */
1040     public function confirm($message, $continue, $cancel) {
1041         if ($continue instanceof single_button) {
1042             // ok
1043         } else if (is_string($continue)) {
1044             $continue = new single_button(new moodle_url($continue), get_string('continue'), 'post');
1045         } else if ($continue instanceof moodle_url) {
1046             $continue = new single_button($continue, get_string('continue'), 'post');
1047         } else {
1048             throw new coding_exception('The continue param to $OUTPUT->confirm() must be either a URL (string/moodle_url) or a single_button instance.');
1049         }
1050
1051         if ($cancel instanceof single_button) {
1052             // ok
1053         } else if (is_string($cancel)) {
1054             $cancel = new single_button(new moodle_url($cancel), get_string('cancel'), 'get');
1055         } else if ($cancel instanceof moodle_url) {
1056             $cancel = new single_button($cancel, get_string('cancel'), 'get');
1057         } else {
1058             throw new coding_exception('The cancel param to $OUTPUT->confirm() must be either a URL (string/moodle_url) or a single_button instance.');
1059         }
1060
1061         $output = $this->box_start('generalbox', 'notice');
1062         $output .= html_writer::tag('p', $message);
1063         $output .= html_writer::tag('div', $this->render($continue) . $this->render($cancel), array('class' => 'buttons'));
1064         $output .= $this->box_end();
1065         return $output;
1066     }
1067
1068     /**
1069      * Returns a form with a single button.
1070      *
1071      * @param string|moodle_url $url
1072      * @param string $label button text
1073      * @param string $method get or post submit method
1074      * @param array $options associative array {disabled, title, etc.}
1075      * @return string HTML fragment
1076      */
1077     public function single_button($url, $label, $method='post', array $options=null) {
1078         if (!($url instanceof moodle_url)) {
1079             $url = new moodle_url($url);
1080         }
1081         $button = new single_button($url, $label, $method);
1082
1083         foreach ((array)$options as $key=>$value) {
1084             if (array_key_exists($key, $button)) {
1085                 $button->$key = $value;
1086             }
1087         }
1088
1089         return $this->render($button);
1090     }
1091
1092     /**
1093      * Internal implementation of single_button rendering
1094      * @param single_button $button
1095      * @return string HTML fragment
1096      */
1097     protected function render_single_button(single_button $button) {
1098         $attributes = array('type'     => 'submit',
1099                             'value'    => $button->label,
1100                             'disabled' => $button->disabled ? 'disabled' : null,
1101                             'title'    => $button->tooltip);
1102
1103         if ($button->actions) {
1104             $id = html_writer::random_id('single_button');
1105             $attributes['id'] = $id;
1106             foreach ($button->actions as $action) {
1107                 $this->add_action_handler($action, $id);
1108             }
1109         }
1110
1111         // first the input element
1112         $output = html_writer::empty_tag('input', $attributes);
1113
1114         // then hidden fields
1115         $params = $button->url->params();
1116         if ($button->method === 'post') {
1117             $params['sesskey'] = sesskey();
1118         }
1119         foreach ($params as $var => $val) {
1120             $output .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => $var, 'value' => $val));
1121         }
1122
1123         // then div wrapper for xhtml strictness
1124         $output = html_writer::tag('div', $output);
1125
1126         // now the form itself around it
1127         if ($button->method === 'get') {
1128             $url = $button->url->out_omit_querystring(true); // url without params, the anchor part allowed
1129         } else {
1130             $url = $button->url->out_omit_querystring();     // url without params, the anchor part not allowed
1131         }
1132         if ($url === '') {
1133             $url = '#'; // there has to be always some action
1134         }
1135         $attributes = array('method' => $button->method,
1136                             'action' => $url,
1137                             'id'     => $button->formid);
1138         $output = html_writer::tag('form', $output, $attributes);
1139
1140         // and finally one more wrapper with class
1141         return html_writer::tag('div', $output, array('class' => $button->class));
1142     }
1143
1144     /**
1145      * Returns a form with a single select widget.
1146      * @param moodle_url $url form action target, includes hidden fields
1147      * @param string $name name of selection field - the changing parameter in url
1148      * @param array $options list of options
1149      * @param string $selected selected element
1150      * @param array $nothing
1151      * @param string $formid
1152      * @return string HTML fragment
1153      */
1154     public function single_select($url, $name, array $options, $selected='', $nothing=array(''=>'choosedots'), $formid=null) {
1155         if (!($url instanceof moodle_url)) {
1156             $url = new moodle_url($url);
1157         }
1158         $select = new single_select($url, $name, $options, $selected, $nothing, $formid);
1159
1160         return $this->render($select);
1161     }
1162
1163     /**
1164      * Internal implementation of single_select rendering
1165      * @param single_select $select
1166      * @return string HTML fragment
1167      */
1168     protected function render_single_select(single_select $select) {
1169         $select = clone($select);
1170         if (empty($select->formid)) {
1171             $select->formid = html_writer::random_id('single_select_f');
1172         }
1173
1174         $output = '';
1175         $params = $select->url->params();
1176         if ($select->method === 'post') {
1177             $params['sesskey'] = sesskey();
1178         }
1179         foreach ($params as $name=>$value) {
1180             $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>$name, 'value'=>$value));
1181         }
1182
1183         if (empty($select->attributes['id'])) {
1184             $select->attributes['id'] = html_writer::random_id('single_select');
1185         }
1186
1187         if ($select->disabled) {
1188             $select->attributes['disabled'] = 'disabled';
1189         }
1190
1191         if ($select->tooltip) {
1192             $select->attributes['title'] = $select->tooltip;
1193         }
1194
1195         if ($select->label) {
1196             $output .= html_writer::label($select->label, $select->attributes['id']);
1197         }
1198
1199         if ($select->helpicon instanceof help_icon) {
1200             $output .= $this->render($select->helpicon);
1201         } else if ($select->helpicon instanceof old_help_icon) {
1202             $output .= $this->render($select->helpicon);
1203         }
1204
1205         $output .= html_writer::select($select->options, $select->name, $select->selected, $select->nothing, $select->attributes);
1206
1207         $go = html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('go')));
1208         $output .= html_writer::tag('noscript', html_writer::tag('div', $go), array('style'=>'inline'));
1209
1210         $nothing = empty($select->nothing) ? false : key($select->nothing);
1211         $this->page->requires->js_init_call('M.util.init_select_autosubmit', array($select->formid, $select->attributes['id'], $nothing));
1212
1213         // then div wrapper for xhtml strictness
1214         $output = html_writer::tag('div', $output);
1215
1216         // now the form itself around it
1217         if ($select->method === 'get') {
1218             $url = $select->url->out_omit_querystring(true); // url without params, the anchor part allowed
1219         } else {
1220             $url = $select->url->out_omit_querystring();     // url without params, the anchor part not allowed
1221         }
1222         $formattributes = array('method' => $select->method,
1223                                 'action' => $url,
1224                                 'id'     => $select->formid);
1225         $output = html_writer::tag('form', $output, $formattributes);
1226
1227         // and finally one more wrapper with class
1228         return html_writer::tag('div', $output, array('class' => $select->class));
1229     }
1230
1231     /**
1232      * Returns a form with a url select widget.
1233      * @param array $urls list of urls - array('/course/view.php?id=1'=>'Frontpage', ....)
1234      * @param string $selected selected element
1235      * @param array $nothing
1236      * @param string $formid
1237      * @return string HTML fragment
1238      */
1239     public function url_select(array $urls, $selected, $nothing=array(''=>'choosedots'), $formid=null) {
1240         $select = new url_select($urls, $selected, $nothing, $formid);
1241         return $this->render($select);
1242     }
1243
1244     /**
1245      * Internal implementation of url_select rendering
1246      * @param single_select $select
1247      * @return string HTML fragment
1248      */
1249     protected function render_url_select(url_select $select) {
1250         global $CFG;
1251
1252         $select = clone($select);
1253         if (empty($select->formid)) {
1254             $select->formid = html_writer::random_id('url_select_f');
1255         }
1256
1257         if (empty($select->attributes['id'])) {
1258             $select->attributes['id'] = html_writer::random_id('url_select');
1259         }
1260
1261         if ($select->disabled) {
1262             $select->attributes['disabled'] = 'disabled';
1263         }
1264
1265         if ($select->tooltip) {
1266             $select->attributes['title'] = $select->tooltip;
1267         }
1268
1269         $output = '';
1270
1271         if ($select->label) {
1272             $output .= html_writer::label($select->label, $select->attributes['id']);
1273         }
1274
1275         if ($select->helpicon instanceof help_icon) {
1276             $output .= $this->render($select->helpicon);
1277         } else if ($select->helpicon instanceof old_help_icon) {
1278             $output .= $this->render($select->helpicon);
1279         }
1280
1281         // For security reasons, the script course/jumpto.php requires URL starting with '/'. To keep
1282         // backward compatibility, we are removing heading $CFG->wwwroot from URLs here.
1283         $urls = array();
1284         foreach ($select->urls as $k=>$v) {
1285             if (is_array($v)) {
1286                 // optgroup structure
1287                 foreach ($v as $optgrouptitle => $optgroupoptions) {
1288                     foreach ($optgroupoptions as $optionurl => $optiontitle) {
1289                         if (empty($optionurl)) {
1290                             $safeoptionurl = '';
1291                         } else if (strpos($optionurl, $CFG->wwwroot.'/') === 0) {
1292                             // debugging('URLs passed to url_select should be in local relative form - please fix the code.', DEBUG_DEVELOPER);
1293                             $safeoptionurl = str_replace($CFG->wwwroot, '', $optionurl);
1294                         } else if (strpos($optionurl, '/') !== 0) {
1295                             debugging("Invalid url_select urls parameter inside optgroup: url '$optionurl' is not local relative url!");
1296                             continue;
1297                         } else {
1298                             $safeoptionurl = $optionurl;
1299                         }
1300                         $urls[$k][$optgrouptitle][$safeoptionurl] = $optiontitle;
1301                     }
1302                 }
1303             } else {
1304                 // plain list structure
1305                 if (empty($k)) {
1306                     // nothing selected option
1307                 } else if (strpos($k, $CFG->wwwroot.'/') === 0) {
1308                     $k = str_replace($CFG->wwwroot, '', $k);
1309                 } else if (strpos($k, '/') !== 0) {
1310                     debugging("Invalid url_select urls parameter: url '$k' is not local relative url!");
1311                     continue;
1312                 }
1313                 $urls[$k] = $v;
1314             }
1315         }
1316         $selected = $select->selected;
1317         if (!empty($selected)) {
1318             if (strpos($select->selected, $CFG->wwwroot.'/') === 0) {
1319                 $selected = str_replace($CFG->wwwroot, '', $selected);
1320             } else if (strpos($selected, '/') !== 0) {
1321                 debugging("Invalid value of parameter 'selected': url '$selected' is not local relative url!");
1322             }
1323         }
1324
1325         $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'sesskey', 'value'=>sesskey()));
1326         $output .= html_writer::select($urls, 'jump', $selected, $select->nothing, $select->attributes);
1327
1328         if (!$select->showbutton) {
1329             $go = html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('go')));
1330             $output .= html_writer::tag('noscript', html_writer::tag('div', $go), array('style'=>'inline'));
1331             $nothing = empty($select->nothing) ? false : key($select->nothing);
1332             $output .= $this->page->requires->js_init_call('M.util.init_url_select', array($select->formid, $select->attributes['id'], $nothing));
1333         } else {
1334             $output .= html_writer::empty_tag('input', array('type'=>'submit', 'value'=>$select->showbutton));
1335         }
1336
1337         // then div wrapper for xhtml strictness
1338         $output = html_writer::tag('div', $output);
1339
1340         // now the form itself around it
1341         $formattributes = array('method' => 'post',
1342                                 'action' => new moodle_url('/course/jumpto.php'),
1343                                 'id'     => $select->formid);
1344         $output = html_writer::tag('form', $output, $formattributes);
1345
1346         // and finally one more wrapper with class
1347         return html_writer::tag('div', $output, array('class' => $select->class));
1348     }
1349
1350     /**
1351      * Returns a string containing a link to the user documentation.
1352      * Also contains an icon by default. Shown to teachers and admin only.
1353      * @param string $path The page link after doc root and language, no leading slash.
1354      * @param string $text The text to be displayed for the link
1355      * @return string
1356      */
1357     public function doc_link($path, $text = '') {
1358         global $CFG;
1359
1360         $icon = $this->pix_icon('docs', $text, 'moodle', array('class'=>'iconhelp'));
1361
1362         $url = new moodle_url(get_docs_url($path));
1363
1364         $attributes = array('href'=>$url);
1365         if (!empty($CFG->doctonewwindow)) {
1366             $attributes['id'] = $this->add_action_handler(new popup_action('click', $url));
1367         }
1368
1369         return html_writer::tag('a', $icon.$text, $attributes);
1370     }
1371
1372     /**
1373      * Render icon
1374      * @param string $pix short pix name
1375      * @param string $alt mandatory alt attribute
1376      * @param string $component standard compoennt name like 'moodle', 'mod_forum', etc.
1377      * @param array $attributes htm lattributes
1378      * @return string HTML fragment
1379      */
1380     public function pix_icon($pix, $alt, $component='moodle', array $attributes = null) {
1381         $icon = new pix_icon($pix, $alt, $component, $attributes);
1382         return $this->render($icon);
1383     }
1384
1385     /**
1386      * Render icon
1387      * @param pix_icon $icon
1388      * @return string HTML fragment
1389      */
1390     protected function render_pix_icon(pix_icon $icon) {
1391         $attributes = $icon->attributes;
1392         $attributes['src'] = $this->pix_url($icon->pix, $icon->component);
1393         return html_writer::empty_tag('img', $attributes);
1394     }
1395
1396     /**
1397      * Render emoticon
1398      * @param pix_emoticon $emoticon
1399      * @return string HTML fragment
1400      */
1401     protected function render_pix_emoticon(pix_emoticon $emoticon) {
1402         $attributes = $emoticon->attributes;
1403         $attributes['src'] = $this->pix_url($emoticon->pix, $emoticon->component);
1404         return html_writer::empty_tag('img', $attributes);
1405     }
1406
1407     /**
1408     * Produces the html that represents this rating in the UI
1409     * @param $page the page object on which this rating will appear
1410     */
1411     function render_rating(rating $rating) {
1412         global $CFG, $USER;
1413
1414         if ($rating->settings->aggregationmethod == RATING_AGGREGATE_NONE) {
1415             return null;//ratings are turned off
1416         }
1417
1418         $ratingmanager = new rating_manager();
1419         // Initialise the JavaScript so ratings can be done by AJAX.
1420         $ratingmanager->initialise_rating_javascript($this->page);
1421
1422         $strrate = get_string("rate", "rating");
1423         $ratinghtml = ''; //the string we'll return
1424
1425         // permissions check - can they view the aggregate?
1426         if ($rating->user_can_view_aggregate()) {
1427
1428             $aggregatelabel = $ratingmanager->get_aggregate_label($rating->settings->aggregationmethod);
1429             $aggregatestr   = $rating->get_aggregate_string();
1430
1431             $aggregatehtml  = html_writer::tag('span', $aggregatestr, array('id' => 'ratingaggregate'.$rating->itemid)).' ';
1432             $aggregatehtml .= html_writer::start_tag('span', array('id'=>"ratingcount{$rating->itemid}"));
1433             if ($rating->count > 0) {
1434                 $aggregatehtml .= "({$rating->count})";
1435             } else {
1436                 $aggregatehtml .= '-';
1437             }
1438             $aggregatehtml .= html_writer::end_tag('span').' ';
1439
1440             $ratinghtml .= html_writer::tag('span', $aggregatelabel, array('class'=>'rating-aggregate-label'));
1441             if ($rating->settings->permissions->viewall && $rating->settings->pluginpermissions->viewall) {
1442
1443                 $nonpopuplink = $rating->get_view_ratings_url();
1444                 $popuplink = $rating->get_view_ratings_url(true);
1445
1446                 $action = new popup_action('click', $popuplink, 'ratings', array('height' => 400, 'width' => 600));
1447                 $ratinghtml .= $this->action_link($nonpopuplink, $aggregatehtml, $action);
1448             } else {
1449                 $ratinghtml .= $aggregatehtml;
1450             }
1451         }
1452
1453         $formstart = null;
1454         // if the item doesn't belong to the current user, the user has permission to rate
1455         // and we're within the assessable period
1456         if ($rating->user_can_rate()) {
1457
1458             $rateurl = $rating->get_rate_url();
1459             $inputs = $rateurl->params();
1460
1461             //start the rating form
1462             $formattrs = array(
1463                 'id'     => "postrating{$rating->itemid}",
1464                 'class'  => 'postratingform',
1465                 'method' => 'post',
1466                 'action' => $rateurl->out_omit_querystring()
1467             );
1468             $formstart  = html_writer::start_tag('form', $formattrs);
1469             $formstart .= html_writer::start_tag('div', array('class' => 'ratingform'));
1470
1471             // add the hidden inputs
1472             foreach ($inputs as $name => $value) {
1473                 $attributes = array('type' => 'hidden', 'class' => 'ratinginput', 'name' => $name, 'value' => $value);
1474                 $formstart .= html_writer::empty_tag('input', $attributes);
1475             }
1476
1477             if (empty($ratinghtml)) {
1478                 $ratinghtml .= $strrate.': ';
1479             }
1480             $ratinghtml = $formstart.$ratinghtml;
1481
1482             $scalearray = array(RATING_UNSET_RATING => $strrate.'...') + $rating->settings->scale->scaleitems;
1483             $scaleattrs = array('class'=>'postratingmenu ratinginput','id'=>'menurating'.$rating->itemid);
1484             $ratinghtml .= html_writer::select($scalearray, 'rating', $rating->rating, false, $scaleattrs);
1485
1486             //output submit button
1487             $ratinghtml .= html_writer::start_tag('span', array('class'=>"ratingsubmit"));
1488
1489             $attributes = array('type' => 'submit', 'class' => 'postratingmenusubmit', 'id' => 'postratingsubmit'.$rating->itemid, 'value' => s(get_string('rate', 'rating')));
1490             $ratinghtml .= html_writer::empty_tag('input', $attributes);
1491
1492             if (!$rating->settings->scale->isnumeric) {
1493                 $ratinghtml .= $this->help_icon_scale($rating->settings->scale->courseid, $rating->settings->scale);
1494             }
1495             $ratinghtml .= html_writer::end_tag('span');
1496             $ratinghtml .= html_writer::end_tag('div');
1497             $ratinghtml .= html_writer::end_tag('form');
1498         }
1499
1500         return $ratinghtml;
1501     }
1502
1503     /*
1504      * Centered heading with attached help button (same title text)
1505      * and optional icon attached
1506      * @param string $text A heading text
1507      * @param string $helpidentifier The keyword that defines a help page
1508      * @param string $component component name
1509      * @param string|moodle_url $icon
1510      * @param string $iconalt icon alt text
1511      * @return string HTML fragment
1512      */
1513     public function heading_with_help($text, $helpidentifier, $component='moodle', $icon='', $iconalt='') {
1514         $image = '';
1515         if ($icon) {
1516             $image = $this->pix_icon($icon, $iconalt, $component, array('class'=>'icon'));
1517         }
1518
1519         $help = '';
1520         if ($helpidentifier) {
1521             $help = $this->help_icon($helpidentifier, $component);
1522         }
1523
1524         return $this->heading($image.$text.$help, 2, 'main help');
1525     }
1526
1527     /**
1528      * Print a help icon.
1529      *
1530      * @deprecated since Moodle 2.0
1531      * @param string $page The keyword that defines a help page
1532      * @param string $title A descriptive text for accessibility only
1533      * @param string $component component name
1534      * @param string|bool $linktext true means use $title as link text, string means link text value
1535      * @return string HTML fragment
1536      */
1537     public function old_help_icon($helpidentifier, $title, $component = 'moodle', $linktext = '') {
1538         debugging('The method old_help_icon() is deprecated, please fix the code and use help_icon() method instead', DEBUG_DEVELOPER);
1539         $icon = new old_help_icon($helpidentifier, $title, $component);
1540         if ($linktext === true) {
1541             $icon->linktext = $title;
1542         } else if (!empty($linktext)) {
1543             $icon->linktext = $linktext;
1544         }
1545         return $this->render($icon);
1546     }
1547
1548     /**
1549      * Implementation of user image rendering.
1550      * @param help_icon $helpicon
1551      * @return string HTML fragment
1552      */
1553     protected function render_old_help_icon(old_help_icon $helpicon) {
1554         global $CFG;
1555
1556         // first get the help image icon
1557         $src = $this->pix_url('help');
1558
1559         if (empty($helpicon->linktext)) {
1560             $alt = $helpicon->title;
1561         } else {
1562             $alt = get_string('helpwiththis');
1563         }
1564
1565         $attributes = array('src'=>$src, 'alt'=>$alt, 'class'=>'iconhelp');
1566         $output = html_writer::empty_tag('img', $attributes);
1567
1568         // add the link text if given
1569         if (!empty($helpicon->linktext)) {
1570             // the spacing has to be done through CSS
1571             $output .= $helpicon->linktext;
1572         }
1573
1574         // now create the link around it - we need https on loginhttps pages
1575         $url = new moodle_url($CFG->httpswwwroot.'/help.php', array('component' => $helpicon->component, 'identifier' => $helpicon->helpidentifier, 'lang'=>current_language()));
1576
1577         // note: this title is displayed only if JS is disabled, otherwise the link will have the new ajax tooltip
1578         $title = get_string('helpprefix2', '', trim($helpicon->title, ". \t"));
1579
1580         $attributes = array('href'=>$url, 'title'=>$title);
1581         $id = html_writer::random_id('helpicon');
1582         $attributes['id'] = $id;
1583         $output = html_writer::tag('a', $output, $attributes);
1584
1585         $this->page->requires->js_init_call('M.util.help_icon.add', array(array('id'=>$id, 'url'=>$url->out(false))));
1586
1587         // and finally span
1588         return html_writer::tag('span', $output, array('class' => 'helplink'));
1589     }
1590
1591     /**
1592      * Print a help icon.
1593      *
1594      * @param string $identifier The keyword that defines a help page
1595      * @param string $component component name
1596      * @param string|bool $linktext true means use $title as link text, string means link text value
1597      * @return string HTML fragment
1598      */
1599     public function help_icon($identifier, $component = 'moodle', $linktext = '') {
1600         $icon = new help_icon($identifier, $component);
1601         $icon->diag_strings();
1602         if ($linktext === true) {
1603             $icon->linktext = get_string($icon->identifier, $icon->component);
1604         } else if (!empty($linktext)) {
1605             $icon->linktext = $linktext;
1606         }
1607         return $this->render($icon);
1608     }
1609
1610     /**
1611      * Implementation of user image rendering.
1612      * @param help_icon $helpicon
1613      * @return string HTML fragment
1614      */
1615     protected function render_help_icon(help_icon $helpicon) {
1616         global $CFG;
1617
1618         // first get the help image icon
1619         $src = $this->pix_url('help');
1620
1621         $title = get_string($helpicon->identifier, $helpicon->component);
1622
1623         if (empty($helpicon->linktext)) {
1624             $alt = $title;
1625         } else {
1626             $alt = get_string('helpwiththis');
1627         }
1628
1629         $attributes = array('src'=>$src, 'alt'=>$alt, 'class'=>'iconhelp');
1630         $output = html_writer::empty_tag('img', $attributes);
1631
1632         // add the link text if given
1633         if (!empty($helpicon->linktext)) {
1634             // the spacing has to be done through CSS
1635             $output .= $helpicon->linktext;
1636         }
1637
1638         // now create the link around it - we need https on loginhttps pages
1639         $url = new moodle_url($CFG->httpswwwroot.'/help.php', array('component' => $helpicon->component, 'identifier' => $helpicon->identifier, 'lang'=>current_language()));
1640
1641         // note: this title is displayed only if JS is disabled, otherwise the link will have the new ajax tooltip
1642         $title = get_string('helpprefix2', '', trim($title, ". \t"));
1643
1644         $attributes = array('href'=>$url, 'title'=>$title);
1645         $id = html_writer::random_id('helpicon');
1646         $attributes['id'] = $id;
1647         $output = html_writer::tag('a', $output, $attributes);
1648
1649         $this->page->requires->js_init_call('M.util.help_icon.add', array(array('id'=>$id, 'url'=>$url->out(false))));
1650
1651         // and finally span
1652         return html_writer::tag('span', $output, array('class' => 'helplink'));
1653     }
1654
1655     /**
1656      * Print scale help icon.
1657      *
1658      * @param int $courseid
1659      * @param object $scale instance
1660      * @return string  HTML fragment
1661      */
1662     public function help_icon_scale($courseid, stdClass $scale) {
1663         global $CFG;
1664
1665         $title = get_string('helpprefix2', '', $scale->name) .' ('.get_string('newwindow').')';
1666
1667         $icon = $this->pix_icon('help', get_string('scales'), 'moodle', array('class'=>'iconhelp'));
1668
1669         $scaleid = abs($scale->id);
1670
1671         $link = new moodle_url('/course/scales.php', array('id' => $courseid, 'list' => true, 'scaleid' => $scaleid));
1672         $action = new popup_action('click', $link, 'ratingscale');
1673
1674         return html_writer::tag('span', $this->action_link($link, $icon, $action), array('class' => 'helplink'));
1675     }
1676
1677     /**
1678      * Creates and returns a spacer image with optional line break.
1679      *
1680      * @param array $attributes
1681      * @param boo spacer
1682      * @return string HTML fragment
1683      */
1684     public function spacer(array $attributes = null, $br = false) {
1685         $attributes = (array)$attributes;
1686         if (empty($attributes['width'])) {
1687             $attributes['width'] = 1;
1688         }
1689         if (empty($attributes['height'])) {
1690             $attributes['height'] = 1;
1691         }
1692         $attributes['class'] = 'spacer';
1693
1694         $output = $this->pix_icon('spacer', '', 'moodle', $attributes);
1695
1696         if (!empty($br)) {
1697             $output .= '<br />';
1698         }
1699
1700         return $output;
1701     }
1702
1703     /**
1704      * Print the specified user's avatar.
1705      *
1706      * User avatar may be obtained in two ways:
1707      * <pre>
1708      * // Option 1: (shortcut for simple cases, preferred way)
1709      * // $user has come from the DB and has fields id, picture, imagealt, firstname and lastname
1710      * $OUTPUT->user_picture($user, array('popup'=>true));
1711      *
1712      * // Option 2:
1713      * $userpic = new user_picture($user);
1714      * // Set properties of $userpic
1715      * $userpic->popup = true;
1716      * $OUTPUT->render($userpic);
1717      * </pre>
1718      *
1719      * @param object Object with at least fields id, picture, imagealt, firstname, lastname
1720      *     If any of these are missing, the database is queried. Avoid this
1721      *     if at all possible, particularly for reports. It is very bad for performance.
1722      * @param array $options associative array with user picture options, used only if not a user_picture object,
1723      *     options are:
1724      *     - courseid=$this->page->course->id (course id of user profile in link)
1725      *     - size=35 (size of image)
1726      *     - link=true (make image clickable - the link leads to user profile)
1727      *     - popup=false (open in popup)
1728      *     - alttext=true (add image alt attribute)
1729      *     - class = image class attribute (default 'userpicture')
1730      * @return string HTML fragment
1731      */
1732     public function user_picture(stdClass $user, array $options = null) {
1733         $userpicture = new user_picture($user);
1734         foreach ((array)$options as $key=>$value) {
1735             if (array_key_exists($key, $userpicture)) {
1736                 $userpicture->$key = $value;
1737             }
1738         }
1739         return $this->render($userpicture);
1740     }
1741
1742     /**
1743      * Internal implementation of user image rendering.
1744      * @param user_picture $userpicture
1745      * @return string
1746      */
1747     protected function render_user_picture(user_picture $userpicture) {
1748         global $CFG, $DB;
1749
1750         $user = $userpicture->user;
1751
1752         if ($userpicture->alttext) {
1753             if (!empty($user->imagealt)) {
1754                 $alt = $user->imagealt;
1755             } else {
1756                 $alt = get_string('pictureof', '', fullname($user));
1757             }
1758         } else {
1759             $alt = '';
1760         }
1761
1762         if (empty($userpicture->size)) {
1763             $file = 'f2';
1764             $size = 35;
1765         } else if ($userpicture->size === true or $userpicture->size == 1) {
1766             $file = 'f1';
1767             $size = 100;
1768         } else if ($userpicture->size >= 50) {
1769             $file = 'f1';
1770             $size = $userpicture->size;
1771         } else {
1772             $file = 'f2';
1773             $size = $userpicture->size;
1774         }
1775
1776         $class = $userpicture->class;
1777
1778         if ($user->picture == 1) {
1779             $usercontext = get_context_instance(CONTEXT_USER, $user->id);
1780             $src = moodle_url::make_pluginfile_url($usercontext->id, 'user', 'icon', NULL, '/', $file);
1781
1782         } else if ($user->picture == 2) {
1783             //TODO: gravatar user icon support
1784
1785         } else { // Print default user pictures (use theme version if available)
1786             $class .= ' defaultuserpic';
1787             $src = $this->pix_url('u/' . $file);
1788         }
1789
1790         $attributes = array('src'=>$src, 'alt'=>$alt, 'title'=>$alt, 'class'=>$class, 'width'=>$size, 'height'=>$size);
1791
1792         // get the image html output fisrt
1793         $output = html_writer::empty_tag('img', $attributes);;
1794
1795         // then wrap it in link if needed
1796         if (!$userpicture->link) {
1797             return $output;
1798         }
1799
1800         if (empty($userpicture->courseid)) {
1801             $courseid = $this->page->course->id;
1802         } else {
1803             $courseid = $userpicture->courseid;
1804         }
1805
1806         if ($courseid == SITEID) {
1807             $url = new moodle_url('/user/profile.php', array('id' => $user->id));
1808         } else {
1809             $url = new moodle_url('/user/view.php', array('id' => $user->id, 'course' => $courseid));
1810         }
1811
1812         $attributes = array('href'=>$url);
1813
1814         if ($userpicture->popup) {
1815             $id = html_writer::random_id('userpicture');
1816             $attributes['id'] = $id;
1817             $this->add_action_handler(new popup_action('click', $url), $id);
1818         }
1819
1820         return html_writer::tag('a', $output, $attributes);
1821     }
1822
1823     /**
1824      * Internal implementation of file tree viewer items rendering.
1825      * @param array $dir
1826      * @return string
1827      */
1828     public function htmllize_file_tree($dir) {
1829         if (empty($dir['subdirs']) and empty($dir['files'])) {
1830             return '';
1831         }
1832         $result = '<ul>';
1833         foreach ($dir['subdirs'] as $subdir) {
1834             $result .= '<li>'.s($subdir['dirname']).' '.$this->htmllize_file_tree($subdir).'</li>';
1835         }
1836         foreach ($dir['files'] as $file) {
1837             $filename = $file->get_filename();
1838             $result .= '<li><span>'.html_writer::link($file->fileurl, $filename).'</span></li>';
1839         }
1840         $result .= '</ul>';
1841
1842         return $result;
1843     }
1844     /**
1845      * Print the file picker
1846      *
1847      * <pre>
1848      * $OUTPUT->file_picker($options);
1849      * </pre>
1850      *
1851      * @param array $options associative array with file manager options
1852      *   options are:
1853      *       maxbytes=>-1,
1854      *       itemid=>0,
1855      *       client_id=>uniqid(),
1856      *       acepted_types=>'*',
1857      *       return_types=>FILE_INTERNAL,
1858      *       context=>$PAGE->context
1859      * @return string HTML fragment
1860      */
1861     public function file_picker($options) {
1862         $fp = new file_picker($options);
1863         return $this->render($fp);
1864     }
1865     /**
1866      * Internal implementation of file picker rendering.
1867      * @param file_picker $fp
1868      * @return string
1869      */
1870     public function render_file_picker(file_picker $fp) {
1871         global $CFG, $OUTPUT, $USER;
1872         $options = $fp->options;
1873         $client_id = $options->client_id;
1874         $strsaved = get_string('filesaved', 'repository');
1875         $straddfile = get_string('openpicker', 'repository');
1876         $strloading  = get_string('loading', 'repository');
1877         $icon_progress = $OUTPUT->pix_icon('i/loading_small', $strloading).'';
1878
1879         $currentfile = $options->currentfile;
1880         if (empty($currentfile)) {
1881             $currentfile = get_string('nofilesattached', 'repository');
1882         }
1883         if ($options->maxbytes) {
1884             $size = $options->maxbytes;
1885         } else {
1886             $size = get_max_upload_file_size();
1887         }
1888         if ($size == -1) {
1889             $maxsize = '';
1890         } else {
1891             $maxsize = get_string('maxfilesize', 'moodle', display_size($size));
1892         }
1893         if ($options->buttonname) {
1894             $buttonname = ' name="' . $options->buttonname . '"';
1895         } else {
1896             $buttonname = '';
1897         }
1898         $html = <<<EOD
1899 <div class="filemanager-loading mdl-align" id='filepicker-loading-{$client_id}'>
1900 $icon_progress
1901 </div>
1902 <div id="filepicker-wrapper-{$client_id}" class="mdl-left" style="display:none">
1903     <div>
1904         <input type="button" id="filepicker-button-{$client_id}" value="{$straddfile}"{$buttonname}/>
1905         <span> $maxsize </span>
1906     </div>
1907 EOD;
1908         if ($options->env != 'url') {
1909             $html .= <<<EOD
1910     <div id="file_info_{$client_id}" class="mdl-left filepicker-filelist">$currentfile</div>
1911 EOD;
1912         }
1913         $html .= '</div>';
1914         return $html;
1915     }
1916
1917     /**
1918      * Prints the 'Update this Modulename' button that appears on module pages.
1919      *
1920      * @param string $cmid the course_module id.
1921      * @param string $modulename the module name, eg. "forum", "quiz" or "workshop"
1922      * @return string the HTML for the button, if this user has permission to edit it, else an empty string.
1923      */
1924     public function update_module_button($cmid, $modulename) {
1925         global $CFG;
1926         if (has_capability('moodle/course:manageactivities', get_context_instance(CONTEXT_MODULE, $cmid))) {
1927             $modulename = get_string('modulename', $modulename);
1928             $string = get_string('updatethis', '', $modulename);
1929             $url = new moodle_url("$CFG->wwwroot/course/mod.php", array('update' => $cmid, 'return' => true, 'sesskey' => sesskey()));
1930             return $this->single_button($url, $string);
1931         } else {
1932             return '';
1933         }
1934     }
1935
1936     /**
1937      * Prints a "Turn editing on/off" button in a form.
1938      * @param moodle_url $url The URL + params to send through when clicking the button
1939      * @return string HTML the button
1940      */
1941     public function edit_button(moodle_url $url) {
1942
1943         $url->param('sesskey', sesskey());
1944         if ($this->page->user_is_editing()) {
1945             $url->param('edit', 'off');
1946             $editstring = get_string('turneditingoff');
1947         } else {
1948             $url->param('edit', 'on');
1949             $editstring = get_string('turneditingon');
1950         }
1951
1952         return $this->single_button($url, $editstring);
1953     }
1954
1955     /**
1956      * Prints a simple button to close a window
1957      *
1958      * @param string $text The lang string for the button's label (already output from get_string())
1959      * @return string html fragment
1960      */
1961     public function close_window_button($text='') {
1962         if (empty($text)) {
1963             $text = get_string('closewindow');
1964         }
1965         $button = new single_button(new moodle_url('#'), $text, 'get');
1966         $button->add_action(new component_action('click', 'close_window'));
1967
1968         return $this->container($this->render($button), 'closewindow');
1969     }
1970
1971     /**
1972      * Output an error message. By default wraps the error message in <span class="error">.
1973      * If the error message is blank, nothing is output.
1974      * @param string $message the error message.
1975      * @return string the HTML to output.
1976      */
1977     public function error_text($message) {
1978         if (empty($message)) {
1979             return '';
1980         }
1981         return html_writer::tag('span', $message, array('class' => 'error'));
1982     }
1983
1984     /**
1985      * Do not call this function directly.
1986      *
1987      * To terminate the current script with a fatal error, call the {@link print_error}
1988      * function, or throw an exception. Doing either of those things will then call this
1989      * function to display the error, before terminating the execution.
1990      *
1991      * @param string $message The message to output
1992      * @param string $moreinfourl URL where more info can be found about the error
1993      * @param string $link Link for the Continue button
1994      * @param array $backtrace The execution backtrace
1995      * @param string $debuginfo Debugging information
1996      * @return string the HTML to output.
1997      */
1998     public function fatal_error($message, $moreinfourl, $link, $backtrace, $debuginfo = null) {
1999         global $CFG;
2000
2001         $output = '';
2002         $obbuffer = '';
2003
2004         if ($this->has_started()) {
2005             // we can not always recover properly here, we have problems with output buffering,
2006             // html tables, etc.
2007             $output .= $this->opencontainers->pop_all_but_last();
2008
2009         } else {
2010             // It is really bad if library code throws exception when output buffering is on,
2011             // because the buffered text would be printed before our start of page.
2012             // NOTE: this hack might be behave unexpectedly in case output buffering is enabled in PHP.ini
2013             error_reporting(0); // disable notices from gzip compression, etc.
2014             while (ob_get_level() > 0) {
2015                 $buff = ob_get_clean();
2016                 if ($buff === false) {
2017                     break;
2018                 }
2019                 $obbuffer .= $buff;
2020             }
2021             error_reporting($CFG->debug);
2022
2023             // Header not yet printed
2024             if (isset($_SERVER['SERVER_PROTOCOL'])) {
2025                 // server protocol should be always present, because this render
2026                 // can not be used from command line or when outputting custom XML
2027                 @header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
2028             }
2029             $this->page->set_context(null); // ugly hack - make sure page context is set to something, we do not want bogus warnings here
2030             $this->page->set_url('/'); // no url
2031             //$this->page->set_pagelayout('base'); //TODO: MDL-20676 blocks on error pages are weird, unfortunately it somehow detect the pagelayout from URL :-(
2032             $this->page->set_title(get_string('error'));
2033             $this->page->set_heading($this->page->course->fullname);
2034             $output .= $this->header();
2035         }
2036
2037         $message = '<p class="errormessage">' . $message . '</p>'.
2038                 '<p class="errorcode"><a href="' . $moreinfourl . '">' .
2039                 get_string('moreinformation') . '</a></p>';
2040         $output .= $this->box($message, 'errorbox');
2041
2042         if (debugging('', DEBUG_DEVELOPER)) {
2043             if (!empty($debuginfo)) {
2044                 $debuginfo = s($debuginfo); // removes all nasty JS
2045                 $debuginfo = str_replace("\n", '<br />', $debuginfo); // keep newlines
2046                 $output .= $this->notification('<strong>Debug info:</strong> '.$debuginfo, 'notifytiny');
2047             }
2048             if (!empty($backtrace)) {
2049                 $output .= $this->notification('<strong>Stack trace:</strong> '.format_backtrace($backtrace), 'notifytiny');
2050             }
2051             if ($obbuffer !== '' ) {
2052                 $output .= $this->notification('<strong>Output buffer:</strong> '.s($obbuffer), 'notifytiny');
2053             }
2054         }
2055
2056         if (!empty($link)) {
2057             $output .= $this->continue_button($link);
2058         }
2059
2060         $output .= $this->footer();
2061
2062         // Padding to encourage IE to display our error page, rather than its own.
2063         $output .= str_repeat(' ', 512);
2064
2065         return $output;
2066     }
2067
2068     /**
2069      * Output a notification (that is, a status message about something that has
2070      * just happened).
2071      *
2072      * @param string $message the message to print out
2073      * @param string $classes normally 'notifyproblem' or 'notifysuccess'.
2074      * @return string the HTML to output.
2075      */
2076     public function notification($message, $classes = 'notifyproblem') {
2077         return html_writer::tag('div', clean_text($message), array('class' => renderer_base::prepare_classes($classes)));
2078     }
2079
2080     /**
2081      * Print a continue button that goes to a particular URL.
2082      *
2083      * @param string|moodle_url $url The url the button goes to.
2084      * @return string the HTML to output.
2085      */
2086     public function continue_button($url) {
2087         if (!($url instanceof moodle_url)) {
2088             $url = new moodle_url($url);
2089         }
2090         $button = new single_button($url, get_string('continue'), 'get');
2091         $button->class = 'continuebutton';
2092
2093         return $this->render($button);
2094     }
2095
2096     /**
2097      * Prints a single paging bar to provide access to other pages  (usually in a search)
2098      *
2099      * @param int $totalcount The total number of entries available to be paged through
2100      * @param int $page The page you are currently viewing
2101      * @param int $perpage The number of entries that should be shown per page
2102      * @param string|moodle_url $baseurl url of the current page, the $pagevar parameter is added
2103      * @param string $pagevar name of page parameter that holds the page number
2104      * @return string the HTML to output.
2105      */
2106     public function paging_bar($totalcount, $page, $perpage, $baseurl, $pagevar = 'page') {
2107         $pb = new paging_bar($totalcount, $page, $perpage, $baseurl, $pagevar);
2108         return $this->render($pb);
2109     }
2110
2111     /**
2112      * Internal implementation of paging bar rendering.
2113      * @param paging_bar $pagingbar
2114      * @return string
2115      */
2116     protected function render_paging_bar(paging_bar $pagingbar) {
2117         $output = '';
2118         $pagingbar = clone($pagingbar);
2119         $pagingbar->prepare($this, $this->page, $this->target);
2120
2121         if ($pagingbar->totalcount > $pagingbar->perpage) {
2122             $output .= get_string('page') . ':';
2123
2124             if (!empty($pagingbar->previouslink)) {
2125                 $output .= '&#160;(' . $pagingbar->previouslink . ')&#160;';
2126             }
2127
2128             if (!empty($pagingbar->firstlink)) {
2129                 $output .= '&#160;' . $pagingbar->firstlink . '&#160;...';
2130             }
2131
2132             foreach ($pagingbar->pagelinks as $link) {
2133                 $output .= "&#160;&#160;$link";
2134             }
2135
2136             if (!empty($pagingbar->lastlink)) {
2137                 $output .= '&#160;...' . $pagingbar->lastlink . '&#160;';
2138             }
2139
2140             if (!empty($pagingbar->nextlink)) {
2141                 $output .= '&#160;&#160;(' . $pagingbar->nextlink . ')';
2142             }
2143         }
2144
2145         return html_writer::tag('div', $output, array('class' => 'paging'));
2146     }
2147
2148     /**
2149      * Output the place a skip link goes to.
2150      * @param string $id The target name from the corresponding $PAGE->requires->skip_link_to($target) call.
2151      * @return string the HTML to output.
2152      */
2153     public function skip_link_target($id = null) {
2154         return html_writer::tag('span', '', array('id' => $id));
2155     }
2156
2157     /**
2158      * Outputs a heading
2159      * @param string $text The text of the heading
2160      * @param int $level The level of importance of the heading. Defaulting to 2
2161      * @param string $classes A space-separated list of CSS classes
2162      * @param string $id An optional ID
2163      * @return string the HTML to output.
2164      */
2165     public function heading($text, $level = 2, $classes = 'main', $id = null) {
2166         $level = (integer) $level;
2167         if ($level < 1 or $level > 6) {
2168             throw new coding_exception('Heading level must be an integer between 1 and 6.');
2169         }
2170         return html_writer::tag('h' . $level, $text, array('id' => $id, 'class' => renderer_base::prepare_classes($classes)));
2171     }
2172
2173     /**
2174      * Outputs a box.
2175      * @param string $contents The contents of the box
2176      * @param string $classes A space-separated list of CSS classes
2177      * @param string $id An optional ID
2178      * @return string the HTML to output.
2179      */
2180     public function box($contents, $classes = 'generalbox', $id = null) {
2181         return $this->box_start($classes, $id) . $contents . $this->box_end();
2182     }
2183
2184     /**
2185      * Outputs the opening section of a box.
2186      * @param string $classes A space-separated list of CSS classes
2187      * @param string $id An optional ID
2188      * @return string the HTML to output.
2189      */
2190     public function box_start($classes = 'generalbox', $id = null) {
2191         $this->opencontainers->push('box', html_writer::end_tag('div'));
2192         return html_writer::start_tag('div', array('id' => $id,
2193                 'class' => 'box ' . renderer_base::prepare_classes($classes)));
2194     }
2195
2196     /**
2197      * Outputs the closing section of a box.
2198      * @return string the HTML to output.
2199      */
2200     public function box_end() {
2201         return $this->opencontainers->pop('box');
2202     }
2203
2204     /**
2205      * Outputs a container.
2206      * @param string $contents The contents of the box
2207      * @param string $classes A space-separated list of CSS classes
2208      * @param string $id An optional ID
2209      * @return string the HTML to output.
2210      */
2211     public function container($contents, $classes = null, $id = null) {
2212         return $this->container_start($classes, $id) . $contents . $this->container_end();
2213     }
2214
2215     /**
2216      * Outputs the opening section of a container.
2217      * @param string $classes A space-separated list of CSS classes
2218      * @param string $id An optional ID
2219      * @return string the HTML to output.
2220      */
2221     public function container_start($classes = null, $id = null) {
2222         $this->opencontainers->push('container', html_writer::end_tag('div'));
2223         return html_writer::start_tag('div', array('id' => $id,
2224                 'class' => renderer_base::prepare_classes($classes)));
2225     }
2226
2227     /**
2228      * Outputs the closing section of a container.
2229      * @return string the HTML to output.
2230      */
2231     public function container_end() {
2232         return $this->opencontainers->pop('container');
2233     }
2234
2235     /**
2236      * Make nested HTML lists out of the items
2237      *
2238      * The resulting list will look something like this:
2239      *
2240      * <pre>
2241      * <<ul>>
2242      * <<li>><div class='tree_item parent'>(item contents)</div>
2243      *      <<ul>
2244      *      <<li>><div class='tree_item'>(item contents)</div><</li>>
2245      *      <</ul>>
2246      * <</li>>
2247      * <</ul>>
2248      * </pre>
2249      *
2250      * @param array[]tree_item $items
2251      * @param array[string]string $attrs html attributes passed to the top of
2252      * the list
2253      * @return string HTML
2254      */
2255     function tree_block_contents($items, $attrs=array()) {
2256         // exit if empty, we don't want an empty ul element
2257         if (empty($items)) {
2258             return '';
2259         }
2260         // array of nested li elements
2261         $lis = array();
2262         foreach ($items as $item) {
2263             // this applies to the li item which contains all child lists too
2264             $content = $item->content($this);
2265             $liclasses = array($item->get_css_type());
2266             if (!$item->forceopen || (!$item->forceopen && $item->collapse) || ($item->children->count()==0  && $item->nodetype==navigation_node::NODETYPE_BRANCH)) {
2267                 $liclasses[] = 'collapsed';
2268             }
2269             if ($item->isactive === true) {
2270                 $liclasses[] = 'current_branch';
2271             }
2272             $liattr = array('class'=>join(' ',$liclasses));
2273             // class attribute on the div item which only contains the item content
2274             $divclasses = array('tree_item');
2275             if ($item->children->count()>0  || $item->nodetype==navigation_node::NODETYPE_BRANCH) {
2276                 $divclasses[] = 'branch';
2277             } else {
2278                 $divclasses[] = 'leaf';
2279             }
2280             if (!empty($item->classes) && count($item->classes)>0) {
2281                 $divclasses[] = join(' ', $item->classes);
2282             }
2283             $divattr = array('class'=>join(' ', $divclasses));
2284             if (!empty($item->id)) {
2285                 $divattr['id'] = $item->id;
2286             }
2287             $content = html_writer::tag('p', $content, $divattr) . $this->tree_block_contents($item->children);
2288             if (!empty($item->preceedwithhr) && $item->preceedwithhr===true) {
2289                 $content = html_writer::empty_tag('hr') . $content;
2290             }
2291             $content = html_writer::tag('li', $content, $liattr);
2292             $lis[] = $content;
2293         }
2294         return html_writer::tag('ul', implode("\n", $lis), $attrs);
2295     }
2296
2297     /**
2298      * Return the navbar content so that it can be echoed out by the layout
2299      * @return string XHTML navbar
2300      */
2301     public function navbar() {
2302         $items = $this->page->navbar->get_items();
2303
2304         $htmlblocks = array();
2305         // Iterate the navarray and display each node
2306         $itemcount = count($items);
2307         $separator = get_separator();
2308         for ($i=0;$i < $itemcount;$i++) {
2309             $item = $items[$i];
2310             $item->hideicon = true;
2311             if ($i===0) {
2312                 $content = html_writer::tag('li', $this->render($item));
2313             } else {
2314                 $content = html_writer::tag('li', $separator.$this->render($item));
2315             }
2316             $htmlblocks[] = $content;
2317         }
2318
2319         //accessibility: heading for navbar list  (MDL-20446)
2320         $navbarcontent = html_writer::tag('span', get_string('pagepath'), array('class'=>'accesshide'));
2321         $navbarcontent .= html_writer::tag('ul', join('', $htmlblocks));
2322         // XHTML
2323         return $navbarcontent;
2324     }
2325
2326     protected function render_navigation_node(navigation_node $item) {
2327         $content = $item->get_content();
2328         $title = $item->get_title();
2329         if ($item->icon instanceof renderable && !$item->hideicon) {
2330             $icon = $this->render($item->icon);
2331             $content = $icon.$content; // use CSS for spacing of icons
2332         }
2333         if ($item->helpbutton !== null) {
2334             $content = trim($item->helpbutton).html_writer::tag('span', $content, array('class'=>'clearhelpbutton', 'tabindex'=>'0'));
2335         }
2336         if ($content === '') {
2337             return '';
2338         }
2339         if ($item->action instanceof action_link) {
2340             $link = $item->action;
2341             if ($item->hidden) {
2342                 $link->add_class('dimmed');
2343             }
2344             $link->text = $content.$link->text; // add help icon
2345             $content = $this->render($link);
2346         } else if ($item->action instanceof moodle_url) {
2347             $attributes = array();
2348             if ($title !== '') {
2349                 $attributes['title'] = $title;
2350             }
2351             if ($item->hidden) {
2352                 $attributes['class'] = 'dimmed_text';
2353             }
2354             $content = html_writer::link($item->action, $content, $attributes);
2355
2356         } else if (is_string($item->action) || empty($item->action)) {
2357             $attributes = array('tabindex'=>'0'); //add tab support to span but still maintain character stream sequence.
2358             if ($title !== '') {
2359                 $attributes['title'] = $title;
2360             }
2361             if ($item->hidden) {
2362                 $attributes['class'] = 'dimmed_text';
2363             }
2364             $content = html_writer::tag('span', $content, $attributes);
2365         }
2366         return $content;
2367     }
2368
2369     /**
2370      * Accessibility: Right arrow-like character is
2371      * used in the breadcrumb trail, course navigation menu
2372      * (previous/next activity), calendar, and search forum block.
2373      * If the theme does not set characters, appropriate defaults
2374      * are set automatically. Please DO NOT
2375      * use &lt; &gt; &raquo; - these are confusing for blind users.
2376      * @return string
2377      */
2378     public function rarrow() {
2379         return $this->page->theme->rarrow;
2380     }
2381
2382     /**
2383      * Accessibility: Right arrow-like character is
2384      * used in the breadcrumb trail, course navigation menu
2385      * (previous/next activity), calendar, and search forum block.
2386      * If the theme does not set characters, appropriate defaults
2387      * are set automatically. Please DO NOT
2388      * use &lt; &gt; &raquo; - these are confusing for blind users.
2389      * @return string
2390      */
2391     public function larrow() {
2392         return $this->page->theme->larrow;
2393     }
2394
2395     /**
2396      * Returns the custom menu if one has been set
2397      *
2398      * A custom menu can be configured by browsing to
2399      *    Settings: Administration > Appearance > Themes > Theme settings
2400      * and then configuring the custommenu config setting as described.
2401      *
2402      * @return string
2403      */
2404     public function custom_menu() {
2405         global $CFG;
2406         if (empty($CFG->custommenuitems)) {
2407             return '';
2408         }
2409         $custommenu = new custom_menu();
2410         return $this->render_custom_menu($custommenu);
2411     }
2412
2413     /**
2414      * Renders a custom menu object (located in outputcomponents.php)
2415      *
2416      * The custom menu this method produces makes use of the YUI3 menunav widget
2417      * and requires very specific html elements and classes.
2418      *
2419      * @staticvar int $menucount
2420      * @param custom_menu $menu
2421      * @return string
2422      */
2423     protected function render_custom_menu(custom_menu $menu) {
2424         static $menucount = 0;
2425         // If the menu has no children return an empty string
2426         if (!$menu->has_children()) {
2427             return '';
2428         }
2429         // Increment the menu count. This is used for ID's that get worked with
2430         // in JavaScript as is essential
2431         $menucount++;
2432         // Initialise this custom menu
2433         $this->page->requires->js_init_call('M.core_custom_menu.init', array('custom_menu_'.$menucount));
2434         // Build the root nodes as required by YUI
2435         $content = html_writer::start_tag('div', array('id'=>'custom_menu_'.$menucount, 'class'=>'yui3-menu yui3-menu-horizontal javascript-disabled'));
2436         $content .= html_writer::start_tag('div', array('class'=>'yui3-menu-content'));
2437         $content .= html_writer::start_tag('ul');
2438         // Render each child
2439         foreach ($menu->get_children() as $item) {
2440             $content .= $this->render_custom_menu_item($item);
2441         }
2442         // Close the open tags
2443         $content .= html_writer::end_tag('ul');
2444         $content .= html_writer::end_tag('div');
2445         $content .= html_writer::end_tag('div');
2446         // Return the custom menu
2447         return $content;
2448     }
2449
2450     /**
2451      * Renders a custom menu node as part of a submenu
2452      *
2453      * The custom menu this method produces makes use of the YUI3 menunav widget
2454      * and requires very specific html elements and classes.
2455      *
2456      * @see render_custom_menu()
2457      *
2458      * @staticvar int $submenucount
2459      * @param custom_menu_item $menunode
2460      * @return string
2461      */
2462     protected function render_custom_menu_item(custom_menu_item $menunode) {
2463         // Required to ensure we get unique trackable id's
2464         static $submenucount = 0;
2465         if ($menunode->has_children()) {
2466             // If the child has menus render it as a sub menu
2467             $submenucount++;
2468             $content = html_writer::start_tag('li');
2469             if ($menunode->get_url() !== null) {
2470                 $url = $menunode->get_url();
2471             } else {
2472                 $url = '#cm_submenu_'.$submenucount;
2473             }
2474             $content .= html_writer::link($url, $menunode->get_text(), array('class'=>'yui3-menu-label', 'title'=>$menunode->get_title()));
2475             $content .= html_writer::start_tag('div', array('id'=>'cm_submenu_'.$submenucount, 'class'=>'yui3-menu custom_menu_submenu'));
2476             $content .= html_writer::start_tag('div', array('class'=>'yui3-menu-content'));
2477             $content .= html_writer::start_tag('ul');
2478             foreach ($menunode->get_children() as $menunode) {
2479                 $content .= $this->render_custom_menu_item($menunode);
2480             }
2481             $content .= html_writer::end_tag('ul');
2482             $content .= html_writer::end_tag('div');
2483             $content .= html_writer::end_tag('div');
2484             $content .= html_writer::end_tag('li');
2485         } else {
2486             // The node doesn't have children so produce a final menuitem
2487             $content = html_writer::start_tag('li', array('class'=>'yui3-menuitem'));
2488             if ($menunode->get_url() !== null) {
2489                 $url = $menunode->get_url();
2490             } else {
2491                 $url = '#';
2492             }
2493             $content .= html_writer::link($url, $menunode->get_text(), array('class'=>'yui3-menuitem-content', 'title'=>$menunode->get_title()));
2494             $content .= html_writer::end_tag('li');
2495         }
2496         // Return the sub menu
2497         return $content;
2498     }
2499 }
2500
2501
2502 /// RENDERERS
2503
2504 /**
2505  * A renderer that generates output for command-line scripts.
2506  *
2507  * The implementation of this renderer is probably incomplete.
2508  *
2509  * @copyright 2009 Tim Hunt
2510  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
2511  * @since     Moodle 2.0
2512  */
2513 class core_renderer_cli extends core_renderer {
2514     /**
2515      * Returns the page header.
2516      * @return string HTML fragment
2517      */
2518     public function header() {
2519         return $this->page->heading . "\n";
2520     }
2521
2522     /**
2523      * Returns a template fragment representing a Heading.
2524      * @param string $text The text of the heading
2525      * @param int $level The level of importance of the heading
2526      * @param string $classes A space-separated list of CSS classes
2527      * @param string $id An optional ID
2528      * @return string A template fragment for a heading
2529      */
2530     public function heading($text, $level = 2, $classes = 'main', $id = null) {
2531         $text .= "\n";
2532         switch ($level) {
2533             case 1:
2534                 return '=>' . $text;
2535             case 2:
2536                 return '-->' . $text;
2537             default:
2538                 return $text;
2539         }
2540     }
2541
2542     /**
2543      * Returns a template fragment representing a fatal error.
2544      * @param string $message The message to output
2545      * @param string $moreinfourl URL where more info can be found about the error
2546      * @param string $link Link for the Continue button
2547      * @param array $backtrace The execution backtrace
2548      * @param string $debuginfo Debugging information
2549      * @return string A template fragment for a fatal error
2550      */
2551     public function fatal_error($message, $moreinfourl, $link, $backtrace, $debuginfo = null) {
2552         $output = "!!! $message !!!\n";
2553
2554         if (debugging('', DEBUG_DEVELOPER)) {
2555             if (!empty($debuginfo)) {
2556                 $output .= $this->notification($debuginfo, 'notifytiny');
2557             }
2558             if (!empty($backtrace)) {
2559                 $output .= $this->notification('Stack trace: ' . format_backtrace($backtrace, true), 'notifytiny');
2560             }
2561         }
2562
2563         return $output;
2564     }
2565
2566     /**
2567      * Returns a template fragment representing a notification.
2568      * @param string $message The message to include
2569      * @param string $classes A space-separated list of CSS classes
2570      * @return string A template fragment for a notification
2571      */
2572     public function notification($message, $classes = 'notifyproblem') {
2573         $message = clean_text($message);
2574         if ($classes === 'notifysuccess') {
2575             return "++ $message ++\n";
2576         }
2577         return "!! $message !!\n";
2578     }
2579 }
2580
2581
2582 /**
2583  * A renderer that generates output for ajax scripts.
2584  *
2585  * This renderer prevents accidental sends back only json
2586  * encoded error messages, all other output is ignored.
2587  *
2588  * @copyright 2010 Petr Skoda
2589  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
2590  * @since     Moodle 2.0
2591  */
2592 class core_renderer_ajax extends core_renderer {
2593     /**
2594      * Returns a template fragment representing a fatal error.
2595      * @param string $message The message to output
2596      * @param string $moreinfourl URL where more info can be found about the error
2597      * @param string $link Link for the Continue button
2598      * @param array $backtrace The execution backtrace
2599      * @param string $debuginfo Debugging information
2600      * @return string A template fragment for a fatal error
2601      */
2602     public function fatal_error($message, $moreinfourl, $link, $backtrace, $debuginfo = null) {
2603         global $CFG;
2604
2605         $this->page->set_context(null); // ugly hack - make sure page context is set to something, we do not want bogus warnings here
2606
2607         $e = new stdClass();
2608         $e->error      = $message;
2609         $e->stacktrace = NULL;
2610         $e->debuginfo  = NULL;
2611         $e->reproductionlink = NULL;
2612         if (!empty($CFG->debug) and $CFG->debug >= DEBUG_DEVELOPER) {
2613             $e->reproductionlink = $link;
2614             if (!empty($debuginfo)) {
2615                 $e->debuginfo = $debuginfo;
2616             }
2617             if (!empty($backtrace)) {
2618                 $e->stacktrace = format_backtrace($backtrace, true);
2619             }
2620         }
2621         $this->header();
2622         return json_encode($e);
2623     }
2624
2625     public function notification($message, $classes = 'notifyproblem') {
2626     }
2627
2628     public function redirect_message($encodedurl, $message, $delay, $debugdisableredirect) {
2629     }
2630
2631     public function header() {
2632         // unfortunately YUI iframe upload does not support application/json
2633         if (!empty($_FILES)) {
2634             @header('Content-type: text/plain; charset=utf-8');
2635         } else {
2636             @header('Content-type: application/json; charset=utf-8');
2637         }
2638
2639         /// Headers to make it not cacheable and json
2640         @header('Cache-Control: no-store, no-cache, must-revalidate');
2641         @header('Cache-Control: post-check=0, pre-check=0', false);
2642         @header('Pragma: no-cache');
2643         @header('Expires: Mon, 20 Aug 1969 09:23:00 GMT');
2644         @header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
2645         @header('Accept-Ranges: none');
2646     }
2647
2648     public function footer() {
2649     }
2650
2651     public function heading($text, $level = 2, $classes = 'main', $id = null) {
2652     }
2653 }
2654