lib/pagelib.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  * This file contains the moodle_page class. There is normally a single instance
  20  * of this class in the $PAGE global variable. This class is a central repository
  21  * of information about the page we are building up to send back to the user.
  22  *
  23  * @package    core
  24  * @subpackage lib
  25  * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
  26  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  27  */
  28
  29 defined('MOODLE_INTERNAL') || die();
  30
  31 /**
  32  * $PAGE is a central store of information about the current page we are
  33  * generating in response to the user's request.
  34  *
  35  * It does not do very much itself
  36  * except keep track of information, however, it serves as the access point to
  37  * some more significant components like $PAGE->theme, $PAGE->requires,
  38  * $PAGE->blocks, etc.
  39  *
  40  * @copyright 2009 Tim Hunt
  41  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  42  * @since Moodle 2.0
  43  *
  44  * @property-read string $activityname The type of activity we are in, for example 'forum' or 'quiz'.
  45  *      Will be null if this page is not within a module.
  46  * @property-read object $activityrecord The row from the activities own database table (for example
  47  *      the forum or quiz table) that this page belongs to. Will be null
  48  *      if this page is not within a module.
  49  * @property-read array $alternativeversions Mime type => object with ->url and ->title.
  50  * @property-read blocks_manager $blocks The blocks manager object for this page.
  51  * @property-read string $bodyclasses Returns a string to use within the class attribute on the body tag.
  52  * @property-read string $button The HTML to go where the Turn editing on button normally goes.
  53  * @property-read bool $cacheable Defaults to true. Set to false to stop the page being cached at all.
  54  * @property-read array $categories An array of all the categories the page course belongs to,
  55  *      starting with the immediately containing category, and working out to
  56  *      the top-level category. This may be the empty array if we are in the
  57  *      front page course.
  58  * @property-read mixed $category The category that the page course belongs to. If there isn't one returns null.
  59  * @property-read object $cm The course_module that this page belongs to. Will be null
  60  *      if this page is not within a module. This is a full cm object, as loaded
  61  *      by get_coursemodule_from_id or get_coursemodule_from_instance,
  62  *      so the extra modname and name fields are present.
  63  * @property-read object $context The main context to which this page belongs.
  64  * @property-read object $course The current course that we are inside - a row from the
  65  *      course table. (Also available as $COURSE global.) If we are not inside
  66  *      an actual course, this will be the site course.
  67  * @property-read string $devicetypeinuse The name of the device type in use
  68  * @property-read string $docspath The path to the Moodle docs for this page.
  69  * @property-read string $focuscontrol The id of the HTML element to be focused when the page has loaded.
  70  * @property-read bool $headerprinted
  71  * @property-read string $heading The main heading that should be displayed at the top of the <body>.
  72  * @property-read string $headingmenu The menu (or actions) to display in the heading
  73  * @property-read array $layout_options Returns arrays with options for layout file.
  74  * @property-read navbar $navbar Returns the navbar object used to display the navbar
  75  * @property-read global_navigation $navigation Returns the global navigation structure
  76  * @property-read xml_container_stack $opencontainers Tracks XHTML tags on this page that have been opened but not closed.
  77  *      mainly for internal use by the rendering code.
  78  * @property-read string $pagelayout The general type of page this is. For example 'normal', 'popup', 'home'.
  79  *      Allows the theme to display things differently, if it wishes to.
  80  * @property-read string $pagetype Returns the page type string, should be used as the id for the body tag in the theme.
  81  * @property-read int $periodicrefreshdelay The periodic refresh delay to use with meta refresh
  82  * @property-read page_requirements_manager $requires Tracks the JavaScript, CSS files, etc. required by this page.
  83  * @property-read settings_navigation $settingsnav
  84  * @property-read int $state One of the STATE_... constants
  85  * @property-read string $subpage The subpage identifier, if any.
  86  * @property-read theme_config $theme Returns the initialised theme for this page.
  87  * @property-read string $title The title that should go in the <head> section of the HTML of this page.
  88  * @property-read moodle_url $url The moodle url object for this page.
  89  */
  90 class moodle_page {
  91     /**#@+ Tracks the where we are in the generation of the page. */
  92     const STATE_BEFORE_HEADER = 0;
  93     const STATE_PRINTING_HEADER = 1;
  94     const STATE_IN_BODY = 2;
  95     const STATE_DONE = 3;
  96     /**#@-*/
  97
  98 /// Field declarations =========================================================
  99
 100     protected $_state = self::STATE_BEFORE_HEADER;
 101
 102     protected $_course = null;
 103
 104     /**
 105      * If this page belongs to a module, this is the cm_info module description object.
 106      * @var cm_info
 107      */
 108     protected $_cm = null;
 109
 110     /**
 111      * If $_cm is not null, then this will hold the corresponding row from the
 112      * modname table. For example, if $_cm->modname is 'quiz', this will be a
 113      * row from the quiz table.
 114      */
 115     protected $_module = null;
 116
 117     /**
 118      * The context that this page belongs to.
 119      */
 120     protected $_context = null;
 121
 122     /**
 123      * This holds any categories that $_course belongs to, starting with the
 124      * particular category it belongs to, and working out through any parent
 125      * categories to the top level. These are loaded progressively, if needed.
 126      * There are three states. $_categories = null initially when nothing is
 127      * loaded; $_categories = array($id => $cat, $parentid => null) when we have
 128      * loaded $_course->category, but not any parents; and a complete array once
 129      * everything is loaded.
 130      */
 131     protected $_categories = null;
 132
 133     protected $_bodyclasses = array();
 134
 135     protected $_title = '';
 136
 137     protected $_heading = '';
 138
 139     protected $_pagetype = null;
 140
 141     protected $_pagelayout = 'base';
 142
 143     /**
 144      * List of theme layout options, these are ignored by core.
 145      * To be used in individual theme layout files only.
 146      * @var array
 147      */
 148     protected $_layout_options = array();
 149
 150     protected $_subpage = '';
 151
 152     protected $_docspath = null;
 153
 154     /** @var string|null A legacy class that will be added to the body tag */
 155     protected $_legacyclass = null;
 156
 157     protected $_url = null;
 158
 159     protected $_alternateversions = array();
 160
 161     protected $_blocks = null;
 162
 163     protected $_requires = null;
 164
 165     protected $_blockseditingcap = 'moodle/site:manageblocks';
 166
 167     protected $_block_actions_done = false;
 168
 169     protected $_othereditingcaps = array();
 170
 171     protected $_cacheable = true;
 172
 173     protected $_focuscontrol = '';
 174
 175     protected $_button = '';
 176
 177     protected $_theme = null;
 178     /** @var global_navigation Contains the global navigation structure*/
 179     protected $_navigation = null;
 180     /** @var null|settings_navigation Contains the settings navigation structure*/
 181     protected $_settingsnav = null;
 182     /** @var null|navbar Contains the navbar structure*/
 183     protected $_navbar = null;
 184     /** @var string */
 185     protected $_headingmenu = null;
 186
 187     /**
 188      * Then the theme is initialised, we save the stack trace, for use in error messages.
 189      * @var array stack trace.
 190      */
 191     protected $_wherethemewasinitialised = null;
 192
 193     /** @var xhtml_container_stack tracks XHTML tags on this page that have been opened but not closed. */
 194     protected $_opencontainers;
 195
 196     /**
 197      * Sets the page to refresh after a given delay (in seconds) using meta refresh
 198      * in {@link standard_head_html()} in outputlib.php
 199      * If set to null(default) the page is not refreshed
 200      * @var int|null
 201      */
 202     protected $_periodicrefreshdelay = null;
 203
 204     /**
 205      * This is simply to improve backwards compatibility. If old code relies on
 206      * a page class that implements print_header, or complex logic in
 207      * user_allowed_editing then we stash an instance of that other class here,
 208      * and delegate to it in certain situations.
 209      */
 210     protected $_legacypageobject = null;
 211
 212     /**
 213      * Associative array of browser shortnames (as used by check_browser_version)
 214      * and their minimum required versions
 215      * @var array
 216      */
 217     protected $_legacybrowsers = array('MSIE' => 6.0);
 218
 219     /**
 220      * Is set to the name of the device type in use.
 221      * This will we worked out when it is first used.
 222      *
 223      * @var string
 224      */
 225     protected $_devicetypeinuse = null;
 226
 227     protected $_https_login_required = false;
 228
 229     protected $_popup_notification_allowed = true;
 230
 231 /// Magic getter methods =============================================================
 232 /// Due to the __get magic below, you normally do not call these as $PAGE->magic_get_x
 233 /// methods, but instead use the $PAGE->x syntax.
 234
 235     /**
 236      * Please do not call this method directly, use the ->state syntax. {@link __get()}.
 237      * @return integer one of the STATE_... constants. You should not normally need
 238      * to use this in your code. It is intended for internal use by this class
 239      * and its friends like print_header, to check that everything is working as
 240      * expected. Also accessible as $PAGE->state.
 241      */
 242     protected function magic_get_state() {
 243         return $this->_state;
 244     }
 245
 246     /**
 247      * Please do not call this method directly, use the ->headerprinted syntax. {@link __get()}.
 248      * @return boolean has the header already been printed?
 249      */
 250     protected function magic_get_headerprinted() {
 251         return $this->_state >= self::STATE_IN_BODY;
 252     }
 253
 254     /**
 255      * Please do not call this method directly, use the ->course syntax. {@link __get()}.
 256      *
 257      * @global object
 258      * @return object the current course that we are inside - a row from the
 259      * course table. (Also available as $COURSE global.) If we are not inside
 260      * an actual course, this will be the site course.
 261      */
 262     protected function magic_get_course() {
 263         global $SITE;
 264         if (is_null($this->_course)) {
 265             return $SITE;
 266         }
 267         return $this->_course;
 268     }
 269
 270     /**
 271      * Please do not call this method directly, use the ->cm syntax. {@link __get()}.
 272      * @return object the course_module that this page belongs to. Will be null
 273      * if this page is not within a module. This is a full cm object, as loaded
 274      * by get_coursemodule_from_id or get_coursemodule_from_instance,
 275      * so the extra modname and name fields are present.
 276      * @return cm_info
 277      */
 278     protected function magic_get_cm() {
 279         return $this->_cm;
 280     }
 281
 282     /**
 283      * Please do not call this method directly, use the ->activityrecord syntax. {@link __get()}.
 284      * @return object the row from the activities own database table (for example
 285      * the forum or quiz table) that this page belongs to. Will be null
 286      * if this page is not within a module.
 287      */
 288     protected function magic_get_activityrecord() {
 289         if (is_null($this->_module) && !is_null($this->_cm)) {
 290             $this->load_activity_record();
 291         }
 292         return $this->_module;
 293     }
 294
 295     /**
 296      * Please do not call this method directly, use the ->activityname syntax. {@link __get()}.
 297      * @return string|null the The type of activity we are in, for example 'forum' or 'quiz'.
 298      * Will be null if this page is not within a module.
 299      */
 300     protected function magic_get_activityname() {
 301         if (is_null($this->_cm)) {
 302             return null;
 303         }
 304         return $this->_cm->modname;
 305     }
 306
 307     /**
 308      * Please do not call this method directly, use the ->category syntax. {@link __get()}.
 309      * @return mixed the category that the page course belongs to. If there isn't one
 310      * (that is, if this is the front page course) returns null.
 311      */
 312     protected function magic_get_category() {
 313         $this->ensure_category_loaded();
 314         if (!empty($this->_categories)) {
 315             return reset($this->_categories);
 316         } else {
 317             return null;
 318         }
 319     }
 320
 321     /**
 322      * Please do not call this method directly, use the ->categories syntax. {@link __get()}.
 323      * @return array an array of all the categories the page course belongs to,
 324      * starting with the immediately containing category, and working out to
 325      * the top-level category. This may be the empty array if we are in the
 326      * front page course.
 327      */
 328     protected function magic_get_categories() {
 329         $this->ensure_categories_loaded();
 330         return $this->_categories;
 331     }
 332
 333     /**
 334      * Please do not call this method directly, use the ->context syntax. {@link __get()}.
 335      * @return object the main context to which this page belongs.
 336      */
 337     protected function magic_get_context() {
 338         if (is_null($this->_context)) {
 339             if (CLI_SCRIPT or NO_MOODLE_COOKIES) {
 340                 // cli scripts work in system context, do not annoy devs with debug info
 341                 // very few scripts do not use cookies, we can safely use system as default context there
 342             } else {
 343                 debugging('Coding problem: $PAGE->context was not set. You may have forgotten '
 344                     .'to call require_login() or $PAGE->set_context(). The page may not display '
 345                     .'correctly as a result');
 346             }
 347             $this->_context = get_context_instance(CONTEXT_SYSTEM);
 348         }
 349         return $this->_context;
 350     }
 351
 352     /**
 353      * Please do not call this method directly, use the ->pagetype syntax. {@link __get()}.
 354      * @return string e.g. 'my-index' or 'mod-quiz-attempt'.
 355      */
 356     protected function magic_get_pagetype() {
 357         global $CFG;
 358         if (is_null($this->_pagetype) || isset($CFG->pagepath)) {
 359             $this->initialise_default_pagetype();
 360         }
 361         return $this->_pagetype;
 362     }
 363
 364     /**
 365      * Please do not call this method directly, use the ->pagetype syntax. {@link __get()}.
 366      * @return string The id to use on the body tag, uses {@link magic_get_pagetype()}.
 367      */
 368     protected function magic_get_bodyid() {
 369         return 'page-'.$this->pagetype;
 370     }
 371
 372     /**
 373      * Please do not call this method directly, use the ->pagelayout syntax. {@link __get()}.
 374      * @return string the general type of page this is. For example 'standard', 'popup', 'home'.
 375      *      Allows the theme to display things differently, if it wishes to.
 376      */
 377     protected function magic_get_pagelayout() {
 378         return $this->_pagelayout;
 379     }
 380
 381     /**
 382      * Please do not call this method directly, use the ->layout_tions syntax. {@link __get()}.
 383      * @return array returns arrys with options for layout file
 384      */
 385     protected function magic_get_layout_options() {
 386         return $this->_layout_options;
 387     }
 388
 389     /**
 390      * Please do not call this method directly, use the ->subpage syntax. {@link __get()}.
 391      * @return string|null The subpage identifier, if any.
 392      */
 393     protected function magic_get_subpage() {
 394         return $this->_subpage;
 395     }
 396
 397     /**
 398      * Please do not call this method directly, use the ->bodyclasses syntax. {@link __get()}.
 399      * @return string the class names to put on the body element in the HTML.
 400      */
 401     protected function magic_get_bodyclasses() {
 402         return implode(' ', array_keys($this->_bodyclasses));
 403     }
 404
 405     /**
 406      * Please do not call this method directly, use the ->title syntax. {@link __get()}.
 407      * @return string the title that should go in the <head> section of the HTML of this page.
 408      */
 409     protected function magic_get_title() {
 410         return $this->_title;
 411     }
 412
 413     /**
 414      * Please do not call this method directly, use the ->heading syntax. {@link __get()}.
 415      * @return string the main heading that should be displayed at the top of the <body>.
 416      */
 417     protected function magic_get_heading() {
 418         return $this->_heading;
 419     }
 420
 421     /**
 422      * Please do not call this method directly, use the ->heading syntax. {@link __get()}.
 423      * @return string The menu (or actions) to display in the heading
 424      */
 425     protected function magic_get_headingmenu() {
 426         return $this->_headingmenu;
 427     }
 428
 429     /**
 430      * Please do not call this method directly, use the ->docspath syntax. {@link __get()}.
 431      * @return string the path to the Moodle docs for this page.
 432      */
 433     protected function magic_get_docspath() {
 434         if (is_string($this->_docspath)) {
 435             return $this->_docspath;
 436         } else {
 437             return str_replace('-', '/', $this->pagetype);
 438         }
 439     }
 440
 441     /**
 442      * Please do not call this method directly, use the ->url syntax. {@link __get()}.
 443      * @return moodle_url the clean URL required to load the current page. (You
 444      * should normally use this in preference to $ME or $FULLME.)
 445      */
 446     protected function magic_get_url() {
 447         global $FULLME;
 448         if (is_null($this->_url)) {
 449             debugging('This page did not call $PAGE->set_url(...). Using '.s($FULLME), DEBUG_DEVELOPER);
 450             $this->_url = new moodle_url($FULLME);
 451             // Make sure the guessed URL cannot lead to dangerous redirects.
 452             $this->_url->remove_params('sesskey');
 453         }
 454         return new moodle_url($this->_url); // Return a clone for safety.
 455     }
 456
 457     /**
 458      * The list of alternate versions of this page.
 459      * @return array mime type => object with ->url and ->title.
 460      */
 461     protected function magic_get_alternateversions() {
 462         return $this->_alternateversions;
 463     }
 464
 465     /**
 466      * Please do not call this method directly, use the ->blocks syntax. {@link __get()}.
 467      * @return blocks_manager the blocks manager object for this page.
 468      */
 469     protected function magic_get_blocks() {
 470         global $CFG;
 471         if (is_null($this->_blocks)) {
 472             if (!empty($CFG->blockmanagerclass)) {
 473                 $classname = $CFG->blockmanagerclass;
 474             } else {
 475                 $classname = 'block_manager';
 476             }
 477             $this->_blocks = new $classname($this);
 478         }
 479         return $this->_blocks;
 480     }
 481
 482     /**
 483      * Please do not call this method directly, use the ->requires syntax. {@link __get()}.
 484      * @return page_requirements_manager tracks the JavaScript, CSS files, etc. required by this page.
 485      */
 486     protected function magic_get_requires() {
 487         global $CFG;
 488         if (is_null($this->_requires)) {
 489             $this->_requires = new page_requirements_manager();
 490         }
 491         return $this->_requires;
 492     }
 493
 494     /**
 495      * Please do not call this method directly, use the ->cacheable syntax. {@link __get()}.
 496      * @return boolean can this page be cached by the user's browser.
 497      */
 498     protected function magic_get_cacheable() {
 499         return $this->_cacheable;
 500     }
 501
 502     /**
 503      * Please do not call this method directly, use the ->focuscontrol syntax. {@link __get()}.
 504      * @return string the id of the HTML element to be focused when the page has loaded.
 505      */
 506     protected function magic_get_focuscontrol() {
 507         return $this->_focuscontrol;
 508     }
 509
 510     /**
 511      * Please do not call this method directly, use the ->button syntax. {@link __get()}.
 512      * @return string the HTML to go where the Turn editing on button normally goes.
 513      */
 514     protected function magic_get_button() {
 515         return $this->_button;
 516     }
 517
 518     /**
 519      * Please do not call this method directly, use the ->theme syntax. {@link __get()}.
 520      * @return theme_config the initialised theme for this page.
 521      */
 522     protected function magic_get_theme() {
 523         if (is_null($this->_theme)) {
 524             $this->initialise_theme_and_output();
 525         }
 526         return $this->_theme;
 527     }
 528
 529     /**
 530      * Please do not call this method directly, use the ->devicetypeinuse syntax. {@link __get()}.
 531      *
 532      * @return string The device type being used.
 533      */
 534     protected function magic_get_devicetypeinuse() {
 535         if (empty($this->_devicetypeinuse)) {
 536             $this->_devicetypeinuse = get_user_device_type();
 537         }
 538         return $this->_devicetypeinuse;
 539     }
 540
 541     /**
 542      * Please do not call this method directly, use the ->legacythemeinuse syntax. {@link __get()}.
 543      * @deprecated since 2.1
 544      * @return bool
 545      */
 546     protected function magic_get_legacythemeinuse() {
 547         debugging('$PAGE->legacythemeinuse is a deprecated property - please use $PAGE->devicetypeinuse and check if it is equal to legacy.', DEBUG_DEVELOPER);
 548         return ($this->devicetypeinuse == 'legacy');
 549     }
 550
 551     /**
 552      * Please do not call this method directly use the ->periodicrefreshdelay syntax
 553      * {@link __get()}
 554      * @return int The periodic refresh delay to use with meta refresh
 555      */
 556     protected function magic_get_periodicrefreshdelay() {
 557         return $this->_periodicrefreshdelay;
 558     }
 559
 560     /**
 561      * Please do not call this method directly use the ->opencontainers syntax. {@link __get()}
 562      * @return xhtml_container_stack tracks XHTML tags on this page that have been opened but not closed.
 563      *      mainly for internal use by the rendering code.
 564      */
 565     protected function magic_get_opencontainers() {
 566         if (is_null($this->_opencontainers)) {
 567             $this->_opencontainers = new xhtml_container_stack();
 568         }
 569         return $this->_opencontainers;
 570     }
 571
 572     /**
 573      * Return the navigation object
 574      * @return global_navigation
 575      */
 576     protected function magic_get_navigation() {
 577         if ($this->_navigation === null) {
 578             $this->_navigation = new global_navigation($this);
 579         }
 580         return $this->_navigation;
 581     }
 582
 583     /**
 584      * Return a navbar object
 585      * @return navbar
 586      */
 587     protected function magic_get_navbar() {
 588         if ($this->_navbar === null) {
 589             $this->_navbar = new navbar($this);
 590         }
 591         return $this->_navbar;
 592     }
 593
 594     /**
 595      * Returns the settings navigation object
 596      * @return settings_navigation
 597      */
 598     protected function magic_get_settingsnav() {
 599         if ($this->_settingsnav === null) {
 600             $this->_settingsnav = new settings_navigation($this);
 601             $this->_settingsnav->initialise();
 602         }
 603         return $this->_settingsnav;
 604     }
 605
 606     /**
 607      * PHP overloading magic to make the $PAGE->course syntax work by redirecting
 608      * it to the corresponding $PAGE->magic_get_course() method if there is one, and
 609      * throwing an exception if not.
 610      *
 611      * @param $name string property name
 612      * @return mixed
 613      */
 614     public function __get($name) {
 615         $getmethod = 'magic_get_' . $name;
 616         if (method_exists($this, $getmethod)) {
 617             return $this->$getmethod();
 618         } else {
 619             throw new coding_exception('Unknown property ' . $name . ' of $PAGE.');
 620         }
 621     }
 622
 623     /**
 624      * PHP overloading magic which prevents the $PAGE->context = $context; syntax
 625      *
 626      * @param $name string property name
 627      * @param $name mixed value
 628      * @return void, throws exception if field not defined in page class
 629      */
 630     public function __set($name, $value) {
 631         if (method_exists($this, 'set_' . $name)) {
 632             throw new coding_exception('Invalid attempt to modify page object', "Use \$PAGE->set_$name() instead.");
 633         } else {
 634             throw new coding_exception('Invalid attempt to modify page object', "Unknown property $name");
 635         }
 636     }
 637
 638 /// Other information getting methods ==========================================
 639
 640     /**
 641      * Returns instance of page renderer
 642      * @param string $component name such as 'core', 'mod_forum' or 'qtype_multichoice'.
 643      * @param string $subtype optional subtype such as 'news' resulting to 'mod_forum_news'
 644      * @param string $target one of rendering target constants
 645      * @return renderer_base
 646      */
 647     public function get_renderer($component, $subtype = null, $target = null) {
 648         return $this->magic_get_theme()->get_renderer($this, $component, $subtype, $target);
 649     }
 650
 651     /**
 652      * Checks to see if there are any items on the navbar object
 653      * @return bool true if there are, false if not
 654      */
 655     public function has_navbar() {
 656         if ($this->_navbar === null) {
 657             $this->_navbar = new navbar($this);
 658         }
 659         return $this->_navbar->has_items();
 660     }
 661
 662     /**
 663      * @return boolean should the current user see this page in editing mode.
 664      * That is, are they allowed to edit this page, and are they currently in
 665      * editing mode.
 666      */
 667     public function user_is_editing() {
 668         global $USER;
 669         return !empty($USER->editing) && $this->user_allowed_editing();
 670     }
 671
 672     /**
 673      * @return boolean does the user have permission to edit blocks on this page.
 674      */
 675     public function user_can_edit_blocks() {
 676         return has_capability($this->_blockseditingcap, $this->_context);
 677     }
 678
 679     /**
 680      * @return boolean does the user have permission to see this page in editing mode.
 681      */
 682     public function user_allowed_editing() {
 683         if ($this->_legacypageobject) {
 684             return $this->_legacypageobject->user_allowed_editing();
 685         }
 686         return has_any_capability($this->all_editing_caps(), $this->_context);
 687     }
 688
 689     /**
 690      * @return string a description of this page. Normally displayed in the footer in
 691      * developer debug mode.
 692      */
 693     public function debug_summary() {
 694         $summary = '';
 695         $summary .= 'General type: ' . $this->pagelayout . '. ';
 696         if (!during_initial_install()) {
 697             $summary .= 'Context ' . print_context_name($this->_context) . ' (context id ' . $this->_context->id . '). ';
 698         }
 699         $summary .= 'Page type ' . $this->pagetype .  '. ';
 700         if ($this->subpage) {
 701             'Sub-page ' . $this->subpage .  '. ';
 702         }
 703         return $summary;
 704     }
 705
 706 /// Setter methods =============================================================
 707
 708     /**
 709      * Set the state. The state must be one of that STATE_... constants, and
 710      * the state is only allowed to advance one step at a time.
 711      * @param integer $state the new state.
 712      */
 713     public function set_state($state) {
 714         if ($state != $this->_state + 1 || $state > self::STATE_DONE) {
 715             throw new coding_exception('Invalid state passed to moodle_page::set_state. We are in state ' .
 716                     $this->_state . ' and state ' . $state . ' was requested.');
 717         }
 718
 719         if ($state == self::STATE_PRINTING_HEADER) {
 720             $this->starting_output();
 721         }
 722
 723         $this->_state = $state;
 724     }
 725
 726     /**
 727      * Set the current course. This sets both $PAGE->course and $COURSE. It also
 728      * sets the right theme and locale.
 729      *
 730      * Normally you don't need to call this function yourself, require_login will
 731      * call it for you if you pass a $course to it. You can use this function
 732      * on pages that do need to call require_login().
 733      *
 734      * Sets $PAGE->context to the course context, if it is not already set.
 735      *
 736      * @param object the course to set as the global course.
 737      */
 738     public function set_course($course) {
 739         global $COURSE, $PAGE;
 740
 741         if (empty($course->id)) {
 742             throw new coding_exception('$course passed to moodle_page::set_course does not look like a proper course object.');
 743         }
 744
 745         $this->ensure_theme_not_set();
 746
 747         if (!empty($this->_course->id) && $this->_course->id != $course->id) {
 748             $this->_categories = null;
 749         }
 750
 751         $this->_course = clone($course);
 752
 753         if ($this === $PAGE) {
 754             $COURSE = $this->_course;
 755             moodle_setlocale();
 756         }
 757
 758         if (!$this->_context) {
 759             $this->set_context(get_context_instance(CONTEXT_COURSE, $this->_course->id));
 760         }
 761     }
 762
 763     /**
 764      * Set the main context to which this page belongs.
 765      * @param object $context a context object, normally obtained with get_context_instance.
 766      */
 767     public function set_context($context) {
 768         if ($context === null) {
 769             // extremely ugly hack which sets context to some value in order to prevent warnings,
 770             // use only for core error handling!!!!
 771             if (!$this->_context) {
 772                 $this->_context = get_context_instance(CONTEXT_SYSTEM);
 773             }
 774             return;
 775         }
 776
 777         // ideally we should set context only once
 778         if (isset($this->_context)) {
 779             if ($context->id == $this->_context->id) {
 780                 // fine - no change needed
 781             } else if ($this->_context->contextlevel == CONTEXT_SYSTEM or $this->_context->contextlevel == CONTEXT_COURSE) {
 782                 // hmm - not ideal, but it might produce too many warnings due to the design of require_login
 783             } else if ($this->_context->contextlevel == CONTEXT_MODULE and $this->_context->id == get_parent_contextid($context)) {
 784                 // hmm - most probably somebody did require_login() and after that set the block context
 785             } else {
 786                 // we do not want devs to do weird switching of context levels on the fly,
 787                 // because we might have used the context already such as in text filter in page title
 788                 debugging('Coding problem: unsupported modification of PAGE->context from '.$this->_context->contextlevel.' to '.$context->contextlevel);
 789             }
 790         }
 791
 792         $this->_context = $context;
 793     }
 794
 795     /**
 796      * The course module that this page belongs to (if it does belong to one).
 797      *
 798      * @param stdClass|cm_info $cm a record from course_modules table or cm_info from get_fast_modinfo().
 799      * @param stdClass $course
 800      * @param stdClass $module
 801      * @return void
 802      */
 803     public function set_cm($cm, $course = null, $module = null) {
 804         global $DB;
 805
 806         if (!isset($cm->id) || !isset($cm->course)) {
 807             throw new coding_exception('Invalid $cm parameter for $PAGE object, it has to be instance of cm_info or record from the course_modules table.');
 808         }
 809
 810         if (!$this->_course || $this->_course->id != $cm->course) {
 811             if (!$course) {
 812                 $course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
 813             }
 814             if ($course->id != $cm->course) {
 815                 throw new coding_exception('The course you passed to $PAGE->set_cm does not correspond to the $cm.');
 816             }
 817             $this->set_course($course);
 818         }
 819
 820         // make sure we have a $cm from get_fast_modinfo as this contains activity access details
 821         if (!($cm instanceof cm_info)) {
 822             $modinfo = get_fast_modinfo($this->_course);
 823             $cm = $modinfo->get_cm($cm->id);
 824         }
 825         $this->_cm = $cm;
 826
 827         // unfortunately the context setting is a mess, let's try to work around some common block problems and show some debug messages
 828         if (empty($this->_context) or $this->_context->contextlevel != CONTEXT_BLOCK) {
 829             $context = get_context_instance(CONTEXT_MODULE, $cm->id);
 830             $this->set_context($context);
 831         }
 832
 833         if ($module) {
 834             $this->set_activity_record($module);
 835         }
 836     }
 837
 838     /**
 839      * @param $module a row from the main database table for the module that this
 840      * page belongs to. For example, if ->cm is a forum, then you can pass the
 841      * corresponding row from the forum table here if you have it (saves a database
 842      * query sometimes).
 843      */
 844     public function set_activity_record($module) {
 845         if (is_null($this->_cm)) {
 846             throw new coding_exception('You cannot call $PAGE->set_activity_record until after $PAGE->cm has been set.');
 847         }
 848         if ($module->id != $this->_cm->instance || $module->course != $this->_course->id) {
 849             throw new coding_exception('The activity record your are trying to set does not seem to correspond to the cm that has been set.');
 850         }
 851         $this->_module = $module;
 852     }
 853
 854     /**
 855      * @param string $pagetype e.g. 'my-index' or 'mod-quiz-attempt'. Normally
 856      * you do not need to set this manually, it is automatically created from the
 857      * script name. However, on some pages this is overridden. For example, the
 858      * page type for course/view.php includes the course format, for example
 859      * 'course-view-weeks'. This gets used as the id attribute on <body> and
 860      * also for determining which blocks are displayed.
 861      */
 862     public function set_pagetype($pagetype) {
 863         $this->_pagetype = $pagetype;
 864     }
 865
 866     /**
 867      * @param string $pagelayout the page layout this is. For example 'popup', 'home'.
 868      * This properly defaults to 'base', so you only need to call this function if
 869      * you want something different. The exact range of supported layouts is specified
 870      * in the standard theme.
 871      */
 872     public function set_pagelayout($pagelayout) {
 873         /**
 874          * Uncomment this to debug theme pagelayout issues like missing blocks.
 875          *
 876          * if (!empty($this->_wherethemewasinitialised) && $pagelayout != $this->_pagelayout) {
 877          *     debugging('Page layout has already been set and cannot be changed.', DEBUG_DEVELOPER);
 878          * }
 879          */
 880         $this->_pagelayout = $pagelayout;
 881     }
 882
 883     /**
 884      * If context->id and pagetype are not enough to uniquely identify this page,
 885      * then you can set a subpage id as well. For example, the tags page sets
 886      * @param string $subpage an arbitrary identifier that, along with context->id
 887      *      and pagetype, uniquely identifies this page.
 888      */
 889     public function set_subpage($subpage) {
 890         if (empty($subpage)) {
 891             $this->_subpage = '';
 892         } else {
 893             $this->_subpage = $subpage;
 894         }
 895     }
 896
 897     /**
 898      * @param string $class add this class name ot the class attribute on the body tag.
 899      */
 900     public function add_body_class($class) {
 901         if ($this->_state > self::STATE_BEFORE_HEADER) {
 902             throw new coding_exception('Cannot call moodle_page::add_body_class after output has been started.');
 903         }
 904         $this->_bodyclasses[$class] = 1;
 905     }
 906
 907     /**
 908      * @param array $classes this utility method calls add_body_class for each array element.
 909      */
 910     public function add_body_classes($classes) {
 911         foreach ($classes as $class) {
 912             $this->add_body_class($class);
 913         }
 914     }
 915
 916     /**
 917      * @param string $title the title that should go in the <head> section of the HTML of this page.
 918      */
 919     public function set_title($title) {
 920         $title = format_string($title);
 921         $title = str_replace('"', '&quot;', $title);
 922         $this->_title = $title;
 923     }
 924
 925     /**
 926      * @param string $heading the main heading that should be displayed at the top of the <body>.
 927      */
 928     public function set_heading($heading) {
 929         $this->_heading = format_string($heading);
 930     }
 931
 932     /**
 933      * @param string $menu The menu/content to show in the heading
 934      */
 935     public function set_headingmenu($menu) {
 936         $this->_headingmenu = $menu;
 937     }
 938
 939     /**
 940      * Set the course category this page belongs to manually. This automatically
 941      * sets $PAGE->course to be the site course. You cannot use this method if
 942      * you have already set $PAGE->course - in that case, the category must be
 943      * the one that the course belongs to. This also automatically sets the
 944      * page context to the category context.
 945      * @param integer $categoryid The id of the category to set.
 946      */
 947     public function set_category_by_id($categoryid) {
 948         global $SITE, $DB;
 949         if (!is_null($this->_course)) {
 950             throw new coding_exception('Attempt to manually set the course category when the course has been set. This is not allowed.');
 951         }
 952         if (is_array($this->_categories)) {
 953             throw new coding_exception('Course category has already been set. You are not allowed to change it.');
 954         }
 955         $this->ensure_theme_not_set();
 956         $this->set_course($SITE);
 957         $this->load_category($categoryid);
 958         $this->set_context(get_context_instance(CONTEXT_COURSECAT, $categoryid));
 959     }
 960
 961     /**
 962      * Set a different path to use for the 'Moodle docs for this page' link.
 963      * By default, it uses the pagetype, which is normally the same as the
 964      * script name. So, for example, for mod/quiz/attempt.php, pagetype is
 965      * mod-quiz-attempt, and so docspath is mod/quiz/attempt.
 966      * @param string $path the path to use at the end of the moodle docs URL.
 967      */
 968     public function set_docs_path($path) {
 969         $this->_docspath = $path;
 970     }
 971
 972     /**
 973      * You should call this method from every page to set the cleaned-up URL
 974      * that should be used to return to this page. Used, for example, by the
 975      * blocks editing UI to know where to return the user after an action.
 976      * For example, course/view.php does:
 977      *      $id = optional_param('id', 0, PARAM_INT);
 978      *      $PAGE->set_url('/course/view.php', array('id' => $id));
 979      * @param moodle_url|string $url URL relative to $CFG->wwwroot or {@link moodle_url} instance
 980      * @param array $params parameters to add to the URL
 981      */
 982     public function set_url($url, array $params = null) {
 983         global $CFG;
 984
 985         if (is_string($url)) {
 986             if (strpos($url, 'http') === 0) {
 987                 // ok
 988             } else if (strpos($url, '/') === 0) {
 989                 // we have to use httpswwwroot here, because of loginhttps pages
 990                 $url = $CFG->httpswwwroot . $url;
 991             } else {
 992                 throw new coding_exception('Invalid parameter $url, has to be full url or in shortened form starting with /.');
 993             }
 994         }
 995
 996         $this->_url = new moodle_url($url, $params);
 997
 998         $fullurl = $this->_url->out_omit_querystring();
 999         if (strpos($fullurl, "$CFG->httpswwwroot/") !== 0) {
1000             debugging('Most probably incorrect set_page() url argument, it does not match the httpswwwroot!');
1001         }
1002         $shorturl = str_replace("$CFG->httpswwwroot/", '', $fullurl);
1003
1004         if (is_null($this->_pagetype)) {
1005             $this->initialise_default_pagetype($shorturl);
1006         }
1007         if (!is_null($this->_legacypageobject)) {
1008             $this->_legacypageobject->set_url($url, $params);
1009         }
1010     }
1011
1012     /**
1013      * Make sure page URL does not contain the given URL parameter.
1014      *
1015      * This should not be necessary if the script has called set_url properly.
1016      * However, in some situations like the block editing actions; when the URL
1017      * has been guessed, it will contain dangerous block-related actions.
1018      * Therefore, the blocks code calls this function to clean up such parameters
1019      * before doing any redirect.
1020      *
1021      * @param string $param the name of the parameter to make sure is not in the
1022      * page URL.
1023      */
1024     public function ensure_param_not_in_url($param) {
1025         $discard = $this->url; // Make sure $this->url is lazy-loaded;
1026         $this->_url->remove_params($param);
1027     }
1028
1029     /**
1030      * There can be alternate versions of some pages (for example an RSS feed version).
1031      * If such other version exist, call this method, and a link to the alternate
1032      * version will be included in the <head> of the page.
1033      *
1034      * @param $title The title to give the alternate version.
1035      * @param $url The URL of the alternate version.
1036      * @param $mimetype The mime-type of the alternate version.
1037      */
1038     public function add_alternate_version($title, $url, $mimetype) {
1039         if ($this->_state > self::STATE_BEFORE_HEADER) {
1040             throw new coding_exception('Cannot call moodle_page::add_alternate_version after output has been started.');
1041         }
1042         $alt = new stdClass;
1043         $alt->title = $title;
1044         $alt->url = $url;
1045         $this->_alternateversions[$mimetype] = $alt;
1046     }
1047
1048     /**
1049      * Specify a form control should be focused when the page has loaded.
1050      *
1051      * @param string $controlid the id of the HTML element to be focused.
1052      */
1053     public function set_focuscontrol($controlid) {
1054         $this->_focuscontrol = $controlid;
1055     }
1056
1057     /**
1058      * Specify a fragment of HTML that goes where the 'Turn editing on' button normally goes.
1059      *
1060      * @param string $html the HTML to display there.
1061      */
1062     public function set_button($html) {
1063         $this->_button = $html;
1064     }
1065
1066     /**
1067      * Set the capability that allows users to edit blocks on this page. Normally
1068      * the default of 'moodle/site:manageblocks' is used, but a few pages like
1069      * the My Moodle page need to use a different capability like 'moodle/my:manageblocks'.
1070      * @param string $capability a capability.
1071      */
1072     public function set_blocks_editing_capability($capability) {
1073         $this->_blockseditingcap = $capability;
1074     }
1075
1076     /**
1077      * Some pages let you turn editing on for reasons other than editing blocks.
1078      * If that is the case, you can pass other capabilities that let the user
1079      * edit this page here.
1080      * @param string|array $capability either a capability, or an array of capabilities.
1081      */
1082     public function set_other_editing_capability($capability) {
1083         if (is_array($capability)) {
1084             $this->_othereditingcaps = array_unique($this->_othereditingcaps + $capability);
1085         } else {
1086             $this->_othereditingcaps[] = $capability;
1087         }
1088     }
1089
1090     /**
1091      * @return boolean $cacheable can this page be cached by the user's browser.
1092      */
1093     public function set_cacheable($cacheable) {
1094         $this->_cacheable = $cacheable;
1095     }
1096
1097     /**
1098      * Sets the page to periodically refresh
1099      *
1100      * This function must be called before $OUTPUT->header has been called or
1101      * a coding exception will be thrown.
1102      *
1103      * @param int $delay Sets the delay before refreshing the page, if set to null
1104      *                    refresh is cancelled
1105      */
1106     public function set_periodic_refresh_delay($delay=null) {
1107         if ($this->_state > self::STATE_BEFORE_HEADER) {
1108             throw new coding_exception('You cannot set a periodic refresh delay after the header has been printed');
1109         }
1110         if ($delay===null) {
1111             $this->_periodicrefreshdelay = null;
1112         } else if (is_int($delay)) {
1113             $this->_periodicrefreshdelay = $delay;
1114         }
1115     }
1116
1117     /**
1118      * Force this page to use a particular theme.
1119      *
1120      * Please use this cautiously. It is only intended to be used by the themes selector admin page.
1121      *
1122      * @param $themename the name of the theme to use.
1123      */
1124     public function force_theme($themename) {
1125         $this->ensure_theme_not_set();
1126         $this->_theme = theme_config::load($themename);
1127     }
1128
1129     /**
1130      * This function indicates that current page requires the https
1131      * when $CFG->loginhttps enabled.
1132      *
1133      * By using this function properly, we can ensure 100% https-ized pages
1134      * at our entire discretion (login, forgot_password, change_password)
1135      * @return void
1136      */
1137     public function https_required() {
1138         global $CFG;
1139
1140         if (!is_null($this->_url)) {
1141             throw new coding_exception('https_required() must be used before setting page url!');
1142         }
1143
1144         $this->ensure_theme_not_set();
1145
1146         $this->_https_login_required = true;
1147
1148         if (!empty($CFG->loginhttps)) {
1149             $CFG->httpswwwroot = str_replace('http:', 'https:', $CFG->wwwroot);
1150         } else {
1151             $CFG->httpswwwroot = $CFG->wwwroot;
1152         }
1153     }
1154
1155     /**
1156      * Makes sure that page previously marked with https_required()
1157      * is really using https://, if not it redirects to https://
1158      *
1159      * @return void (may redirect to https://self)
1160      */
1161     public function verify_https_required() {
1162         global $CFG, $FULLME;
1163
1164         if (is_null($this->_url)) {
1165             throw new coding_exception('verify_https_required() must be called after setting page url!');
1166         }
1167
1168         if (!$this->_https_login_required) {
1169             throw new coding_exception('verify_https_required() must be called only after https_required()!');
1170         }
1171
1172         if (empty($CFG->loginhttps)) {
1173             // https not required, so stop checking
1174             return;
1175         }
1176
1177         if (strpos($this->_url, 'https://')) {
1178             // detect if incorrect PAGE->set_url() used, it is recommended to use root-relative paths there
1179             throw new coding_exception('Invalid page url specified, it must start with https:// for pages that set https_required()!');
1180         }
1181
1182         if (!empty($CFG->sslproxy)) {
1183             // it does not make much sense to use sslproxy and loginhttps at the same time
1184             return;
1185         }
1186
1187         // now the real test and redirect!
1188         if (strpos($FULLME, 'https:') !== 0) {
1189             // this may lead to infinite redirect on misconfigured sites, in that case use $CFG->loginhttps=0; in /config.php
1190             redirect($this->_url);
1191         }
1192     }
1193
1194 /// Initialisation methods =====================================================
1195 /// These set various things up in a default way.
1196
1197     /**
1198      * This method is called when the page first moves out of the STATE_BEFORE_HEADER
1199      * state. This is our last change to initialise things.
1200      */
1201     protected function starting_output() {
1202         global $CFG;
1203
1204         if (!during_initial_install()) {
1205             $this->blocks->load_blocks();
1206             if (empty($this->_block_actions_done)) {
1207                 $this->_block_actions_done = true;
1208                 if ($this->blocks->process_url_actions($this)) {
1209                     redirect($this->url->out(false));
1210                 }
1211             }
1212             $this->blocks->create_all_block_instances();
1213         }
1214
1215         // If maintenance mode is on, change the page header.
1216         if (!empty($CFG->maintenance_enabled)) {
1217             $this->set_button('<a href="' . $CFG->wwwroot . '/' . $CFG->admin .
1218                     '/settings.php?section=maintenancemode">' . get_string('maintenancemode', 'admin') .
1219                     '</a> ' . $this->button);
1220
1221             $title = $this->title;
1222             if ($title) {
1223                 $title .= ' - ';
1224             }
1225             $this->set_title($title . get_string('maintenancemode', 'admin'));
1226         } else {
1227             // Show the messaging popup if there are messages
1228             message_popup_window();
1229         }
1230
1231         $this->initialise_standard_body_classes();
1232     }
1233
1234     /**
1235      * Method for use by Moodle core to set up the theme. Do not
1236      * use this in your own code.
1237      *
1238      * Make sure the right theme for this page is loaded. Tell our
1239      * blocks_manager about the theme block regions, and then, if
1240      * we are $PAGE, set up the global $OUTPUT.
1241      */
1242     public function initialise_theme_and_output() {
1243         global $OUTPUT, $PAGE, $SITE;
1244
1245         if (!empty($this->_wherethemewasinitialised)) {
1246             return;
1247         }
1248
1249         if (!during_initial_install()) {
1250             // detect PAGE->context mess
1251             $this->magic_get_context();
1252         }
1253
1254         if (!$this->_course && !during_initial_install()) {
1255             $this->set_course($SITE);
1256         }
1257
1258         if (is_null($this->_theme)) {
1259             $themename = $this->resolve_theme();
1260             $this->_theme = theme_config::load($themename);
1261             $this->_layout_options = $this->_theme->pagelayout_options($this->pagelayout);
1262         }
1263
1264         $this->_theme->setup_blocks($this->pagelayout, $this->blocks);
1265
1266         if ($this === $PAGE) {
1267             $OUTPUT = $this->get_renderer('core');
1268         }
1269
1270         $this->_wherethemewasinitialised = debug_backtrace();
1271     }
1272
1273     /**
1274      * Work out the theme this page should use.
1275      *
1276      * This depends on numerous $CFG settings, and the properties of this page.
1277      *
1278      * @return string the name of the theme that should be used on this page.
1279      */
1280     protected function resolve_theme() {
1281         global $CFG, $USER, $SESSION;
1282
1283         if (empty($CFG->themeorder)) {
1284             $themeorder = array('course', 'category', 'session', 'user', 'site');
1285         } else {
1286             $themeorder = $CFG->themeorder;
1287             // Just in case, make sure we always use the site theme if nothing else matched.
1288             $themeorder[] = 'site';
1289         }
1290
1291         $mnetpeertheme = '';
1292         if (isloggedin() and isset($CFG->mnet_localhost_id) and $USER->mnethostid != $CFG->mnet_localhost_id) {
1293             require_once($CFG->dirroot.'/mnet/peer.php');
1294             $mnetpeer = new mnet_peer();
1295             $mnetpeer->set_id($USER->mnethostid);
1296             if ($mnetpeer->force_theme == 1 && $mnetpeer->theme != '') {
1297                 $mnetpeertheme = $mnetpeer->theme;
1298             }
1299         }
1300
1301         foreach ($themeorder as $themetype) {
1302             switch ($themetype) {
1303                 case 'course':
1304                     if (!empty($CFG->allowcoursethemes) && !empty($this->_course->theme) && $this->devicetypeinuse == 'default') {
1305                         return $this->_course->theme;
1306                     }
1307
1308                 case 'category':
1309                     if (!empty($CFG->allowcategorythemes) && $this->devicetypeinuse == 'default') {
1310                         $categories = $this->categories;
1311                         foreach ($categories as $category) {
1312                             if (!empty($category->theme)) {
1313                                 return $category->theme;
1314                             }
1315                         }
1316                     }
1317
1318                 case 'session':
1319                     if (!empty($SESSION->theme)) {
1320                         return $SESSION->theme;
1321                     }
1322
1323                 case 'user':
1324                     if (!empty($CFG->allowuserthemes) && !empty($USER->theme) && $this->devicetypeinuse == 'default') {
1325                         if ($mnetpeertheme) {
1326                             return $mnetpeertheme;
1327                         } else {
1328                             return $USER->theme;
1329                         }
1330                     }
1331
1332                 case 'site':
1333                     if ($mnetpeertheme) {
1334                         return $mnetpeertheme;
1335                     }
1336                     // First try for the device the user is using.
1337                     $devicetheme = get_selected_theme_for_device_type($this->devicetypeinuse);
1338                     if (!empty($devicetheme)) {
1339                         return $devicetheme;
1340                     }
1341                     // Next try for the default device (as a fallback)
1342                     $devicetheme = get_selected_theme_for_device_type('default');
1343                     if (!empty($devicetheme)) {
1344                         return $devicetheme;
1345                     }
1346                     // The default device theme isn't set up - use the overall default theme.
1347                     return theme_config::DEFAULT_THEME;
1348             }
1349         }
1350     }
1351
1352
1353     /**
1354      * Sets ->pagetype from the script name. For example, if the script that was
1355      * run is mod/quiz/view.php, ->pagetype will be set to 'mod-quiz-view'.
1356      * @param string $script the path to the script that should be used to
1357      * initialise ->pagetype. If not passed the $SCRIPT global will be used.
1358      * If legacy code has set $CFG->pagepath that will be used instead, and a
1359      * developer warning issued.
1360      */
1361     protected function initialise_default_pagetype($script = null) {
1362         global $CFG, $SCRIPT;
1363
1364         if (isset($CFG->pagepath)) {
1365             debugging('Some code appears to have set $CFG->pagepath. That was a horrible deprecated thing. ' .
1366                     'Don\'t do it! Try calling $PAGE->set_pagetype() instead.');
1367             $script = $CFG->pagepath;
1368             unset($CFG->pagepath);
1369         }
1370
1371         if (is_null($script)) {
1372             $script = ltrim($SCRIPT, '/');
1373             $len = strlen($CFG->admin);
1374             if (substr($script, 0, $len) == $CFG->admin) {
1375                 $script = 'admin' . substr($script, $len);
1376             }
1377         }
1378
1379         $path = str_replace('.php', '', $script);
1380         if (substr($path, -1) == '/') {
1381             $path .= 'index';
1382         }
1383
1384         if (empty($path) || $path == 'index') {
1385             $this->_pagetype = 'site-index';
1386         } else {
1387             $this->_pagetype = str_replace('/', '-', $path);
1388         }
1389     }
1390
1391     protected function initialise_standard_body_classes() {
1392         global $CFG, $USER;
1393
1394         $pagetype = $this->pagetype;
1395         if ($pagetype == 'site-index') {
1396             $this->_legacyclass = 'course';
1397         } else if (substr($pagetype, 0, 6) == 'admin-') {
1398             $this->_legacyclass = 'admin';
1399         }
1400         $this->add_body_class($this->_legacyclass);
1401
1402         $pathbits = explode('-', trim($pagetype));
1403         for ($i=1;$i<count($pathbits);$i++) {
1404             $this->add_body_class('path-'.join('-',array_slice($pathbits, 0, $i)));
1405         }
1406
1407         $this->add_body_classes(get_browser_version_classes());
1408         $this->add_body_class('dir-' . get_string('thisdirection', 'langconfig'));
1409         $this->add_body_class('lang-' . current_language());
1410         $this->add_body_class('yui-skin-sam'); // Make YUI happy, if it is used.
1411         $this->add_body_class('yui3-skin-sam'); // Make YUI3 happy, if it is used.
1412         $this->add_body_class($this->url_to_class_name($CFG->wwwroot));
1413
1414         $this->add_body_class('pagelayout-' . $this->_pagelayout); // extra class describing current page layout
1415
1416         if (!during_initial_install()) {
1417             $this->add_body_class('course-' . $this->_course->id);
1418             $this->add_body_class('context-' . $this->_context->id);
1419         }
1420
1421         if (!empty($this->_cm)) {
1422             $this->add_body_class('cmid-' . $this->_cm->id);
1423         }
1424
1425         if (!empty($CFG->allowcategorythemes)) {
1426             $this->ensure_category_loaded();
1427             foreach ($this->_categories as $catid => $notused) {
1428                 $this->add_body_class('category-' . $catid);
1429             }
1430         } else {
1431             $catid = 0;
1432             if (is_array($this->_categories)) {
1433                 $catids = array_keys($this->_categories);
1434                 $catid = reset($catids);
1435             } else if (!empty($this->_course->category)) {
1436                 $catid = $this->_course->category;
1437             }
1438             if ($catid) {
1439                 $this->add_body_class('category-' . $catid);
1440             }
1441         }
1442
1443         if (!isloggedin()) {
1444             $this->add_body_class('notloggedin');
1445         }
1446
1447         if (!empty($USER->editing)) {
1448             $this->add_body_class('editing');
1449             if (optional_param('bui_moveid', false, PARAM_INT)) {
1450                $this->add_body_class('blocks-moving');
1451         }
1452         }
1453
1454         if (!empty($CFG->blocksdrag)) {
1455             $this->add_body_class('drag');
1456         }
1457
1458         if ($this->_devicetypeinuse != 'default') {
1459             $this->add_body_class($this->_devicetypeinuse . 'theme');
1460         }
1461     }
1462
1463     protected function load_activity_record() {
1464         global $DB;
1465         if (is_null($this->_cm)) {
1466             return;
1467         }
1468         $this->_module = $DB->get_record($this->_cm->modname, array('id' => $this->_cm->instance));
1469     }
1470
1471     protected function ensure_category_loaded() {
1472         if (is_array($this->_categories)) {
1473             return; // Already done.
1474         }
1475         if (is_null($this->_course)) {
1476             throw new coding_exception('Attempt to get the course category for this page before the course was set.');
1477         }
1478         if ($this->_course->category == 0) {
1479             $this->_categories = array();
1480         } else {
1481             $this->load_category($this->_course->category);
1482         }
1483     }
1484
1485     protected function load_category($categoryid) {
1486         global $DB;
1487         $category = $DB->get_record('course_categories', array('id' => $categoryid));
1488         if (!$category) {
1489             throw new moodle_exception('unknowncategory');
1490         }
1491         $this->_categories[$category->id] = $category;
1492         $parentcategoryids = explode('/', trim($category->path, '/'));
1493         array_pop($parentcategoryids);
1494         foreach (array_reverse($parentcategoryids) as $catid) {
1495             $this->_categories[$catid] = null;
1496         }
1497     }
1498
1499     protected function ensure_categories_loaded() {
1500         global $DB;
1501         $this->ensure_category_loaded();
1502         if (!is_null(end($this->_categories))) {
1503             return; // Already done.
1504         }
1505         $idstoload = array_keys($this->_categories);
1506         array_shift($idstoload);
1507         $categories = $DB->get_records_list('course_categories', 'id', $idstoload);
1508         foreach ($idstoload as $catid) {
1509             $this->_categories[$catid] = $categories[$catid];
1510         }
1511     }
1512
1513     protected function ensure_theme_not_set() {
1514         if (!is_null($this->_theme)) {
1515             throw new coding_exception('The theme has already been set up for this page ready for output. ' .
1516                     'Therefore, you can no longer change the theme, or anything that might affect what ' .
1517                     'the current theme is, for example, the course.',
1518                     'Stack trace when the theme was set up: ' . format_backtrace($this->_wherethemewasinitialised));
1519         }
1520     }
1521
1522     protected function url_to_class_name($url) {
1523         $bits = parse_url($url);
1524         $class = str_replace('.', '-', $bits['host']);
1525         if (!empty($bits['port'])) {
1526             $class .= '--' . $bits['port'];
1527         }
1528         if (!empty($bits['path'])) {
1529             $path = trim($bits['path'], '/');
1530             if ($path) {
1531                 $class .= '--' . str_replace('/', '-', $path);
1532             }
1533         }
1534         return $class;
1535     }
1536
1537     protected function all_editing_caps() {
1538         $caps = $this->_othereditingcaps;
1539         $caps[] = $this->_blockseditingcap;
1540         return $caps;
1541     }
1542
1543 /// Deprecated fields and methods for backwards compatibility ==================
1544
1545     /**
1546      * @deprecated since Moodle 2.0 - use $PAGE->pagetype instead.
1547      * @return string page type.
1548      */
1549     public function get_type() {
1550         debugging('Call to deprecated method moodle_page::get_type. Please use $PAGE->pagetype instead.');
1551         return $this->get_pagetype();
1552     }
1553
1554     /**
1555      * @deprecated since Moodle 2.0 - use $PAGE->pagetype instead.
1556      * @return string this is what page_id_and_class used to return via the $getclass parameter.
1557      */
1558     function get_format_name() {
1559         return $this->get_pagetype();
1560     }
1561
1562     /**
1563      * @deprecated since Moodle 2.0 - use $PAGE->course instead.
1564      * @return object course.
1565      */
1566     public function get_courserecord() {
1567         debugging('Call to deprecated method moodle_page::get_courserecord. Please use $PAGE->course instead.');
1568         return $this->get_course();
1569     }
1570
1571     /**
1572      * @deprecated since Moodle 2.0
1573      * @return string this is what page_id_and_class used to return via the $getclass parameter.
1574      */
1575     public function get_legacyclass() {
1576         if (is_null($this->_legacyclass)) {
1577             $this->initialise_standard_body_classes();
1578         }
1579         debugging('Call to deprecated method moodle_page::get_legacyclass.');
1580         return $this->_legacyclass;
1581     }
1582
1583     /**
1584      * @deprecated since Moodle 2.0 - use $PAGE->blocks->get_regions() instead
1585      * @return string the places on this page where blocks can go.
1586      */
1587     function blocks_get_positions() {
1588         debugging('Call to deprecated method moodle_page::blocks_get_positions. Use $PAGE->blocks->get_regions() instead.');
1589         return $this->blocks->get_regions();
1590     }
1591
1592     /**
1593      * @deprecated since Moodle 2.0 - use $PAGE->blocks->get_default_region() instead
1594      * @return string the default place for blocks on this page.
1595      */
1596     function blocks_default_position() {
1597         debugging('Call to deprecated method moodle_page::blocks_default_position. Use $PAGE->blocks->get_default_region() instead.');
1598         return $this->blocks->get_default_region();
1599     }
1600
1601     /**
1602      * @deprecated since Moodle 2.0 - no longer used.
1603      */
1604     function blocks_get_default() {
1605         debugging('Call to deprecated method moodle_page::blocks_get_default. This method has no function any more.');
1606     }
1607
1608     /**
1609      * @deprecated since Moodle 2.0 - no longer used.
1610      */
1611     function blocks_move_position(&$instance, $move) {
1612         debugging('Call to deprecated method moodle_page::blocks_move_position. This method has no function any more.');
1613     }
1614
1615     /**
1616      * @deprecated since Moodle 2.0 - use $this->url->params() instead.
1617      * @return array URL parameters for this page.
1618      */
1619     function url_get_parameters() {
1620         debugging('Call to deprecated method moodle_page::url_get_parameters. Use $this->url->params() instead.');
1621         return $this->url->params();
1622     }
1623
1624     /**
1625      * @deprecated since Moodle 2.0 - use $this->url->params() instead.
1626      * @return string URL for this page without parameters.
1627      */
1628     function url_get_path() {
1629         debugging('Call to deprecated method moodle_page::url_get_path. Use $this->url->out() instead.');
1630         return $this->url->out();
1631     }
1632
1633     /**
1634      * @deprecated since Moodle 2.0 - use $this->url->out() instead.
1635      * @return string full URL for this page.
1636      */
1637     function url_get_full($extraparams = array()) {
1638         debugging('Call to deprecated method moodle_page::url_get_full. Use $this->url->out() instead.');
1639         return $this->url->out(true, $extraparams);
1640     }
1641
1642     /**
1643      * @deprecated since Moodle 2.0 - just a backwards compatibility hook.
1644      */
1645     function set_legacy_page_object($pageobject) {
1646         return $this->_legacypageobject = $pageobject;
1647     }
1648
1649     /**
1650      * @deprecated since Moodle 2.0 - page objects should no longer be doing print_header.
1651      * @param $_,...
1652      */
1653     function print_header($_) {
1654         if (is_null($this->_legacypageobject)) {
1655             throw new coding_exception('You have called print_header on $PAGE when there is not a legacy page class present.');
1656         }
1657         debugging('You should not longer be doing print_header via a page class.', DEBUG_DEVELOPER);
1658         $args = func_get_args();
1659         call_user_func_array(array($this->_legacypageobject, 'print_header'), $args);
1660     }
1661
1662     /**
1663      * @deprecated since Moodle 2.0
1664      * @return the 'page id'. This concept no longer exists.
1665      */
1666     function get_id() {
1667         debugging('Call to deprecated method moodle_page::get_id(). It should not be necessary any more.', DEBUG_DEVELOPER);
1668         if (!is_null($this->_legacypageobject)) {
1669             return $this->_legacypageobject->get_id();
1670         }
1671         return 0;
1672     }
1673
1674     /**
1675      * @deprecated since Moodle 2.0
1676      * @return the 'page id'. This concept no longer exists.
1677      */
1678     function get_pageid() {
1679         debugging('Call to deprecated method moodle_page::get_pageid(). It should not be necessary any more.', DEBUG_DEVELOPER);
1680         if (!is_null($this->_legacypageobject)) {
1681             return $this->_legacypageobject->get_id();
1682         }
1683         return 0;
1684     }
1685
1686     /**
1687      * @deprecated since Moodle 2.0 - user $PAGE->cm instead.
1688      * @return $this->cm;
1689      */
1690     function get_modulerecord() {
1691         return $this->cm;
1692     }
1693
1694     public function has_set_url() {
1695         return ($this->_url!==null);
1696     }
1697
1698     public function set_block_actions_done($setting = true) {
1699         $this->_block_actions_done = $setting;
1700     }
1701
1702     /**
1703      * Are popup notifications allowed on this page?
1704      * Popup notifications may be disallowed in situations such as while upgrading or completing a quiz
1705      * @return boolean true if popup notifications may be displayed
1706      */
1707     public function get_popup_notification_allowed() {
1708         return $this->_popup_notification_allowed;
1709     }
1710
1711     /**
1712      * Allow or disallow popup notifications on this page. Popups are allowed by default.
1713      * @param boolean true if notifications are allowed. False if not allowed. They are allowed by default.
1714      * @return null
1715      */
1716     public function set_popup_notification_allowed($allowed) {
1717         $this->_popup_notification_allowed = $allowed;
1718     }
1719 }
1720
1721 /**
1722  * @deprecated since Moodle 2.0
1723  * Not needed any more.
1724  * @param $path the folder path
1725  * @return array an array of page types.
1726  */
1727 function page_import_types($path) {
1728     global $CFG;
1729     debugging('Call to deprecated function page_import_types.', DEBUG_DEVELOPER);
1730 }
1731
1732 /**
1733  * @deprecated since Moodle 2.0
1734  * Do not use this any more. The global $PAGE is automatically created for you.
1735  * If you need custom behaviour, you should just set properties of that object.
1736  * @param integer $instance legacy page instance id.
1737  * @return the global $PAGE object.
1738  */
1739 function page_create_instance($instance) {
1740     global $PAGE;
1741     return page_create_object($PAGE->pagetype, $instance);
1742 }
1743
1744 /**
1745  * @deprecated since Moodle 2.0
1746  * Do not use this any more. The global $PAGE is automatically created for you.
1747  * If you need custom behaviour, you should just set properties of that object.
1748  */
1749 function page_create_object($type, $id = NULL) {
1750     global $CFG, $PAGE, $SITE, $ME;
1751     debugging('Call to deprecated function page_create_object.', DEBUG_DEVELOPER);
1752
1753     $data = new stdClass;
1754     $data->pagetype = $type;
1755     $data->pageid = $id;
1756
1757     $classname = page_map_class($type);
1758     if (!$classname) {
1759         return $PAGE;
1760     }
1761     $legacypage = new $classname;
1762     $legacypage->init_quick($data);
1763
1764     $course = $PAGE->course;
1765     if ($course->id != $SITE->id) {
1766         $legacypage->set_course($course);
1767     } else {
1768         try {
1769             $category = $PAGE->category;
1770         } catch (coding_exception $e) {
1771             // Was not set before, so no need to try to set it again.
1772             $category = false;
1773         }
1774         if ($category) {
1775             $legacypage->set_category_by_id($category->id);
1776         } else {
1777             $legacypage->set_course($SITE);
1778         }
1779     }
1780
1781     $legacypage->set_pagetype($type);
1782
1783     $legacypage->set_url($ME);
1784     $PAGE->set_url(str_replace($CFG->wwwroot . '/', '', $legacypage->url_get_full()));
1785
1786     $PAGE->set_pagetype($type);
1787     $PAGE->set_legacy_page_object($legacypage);
1788     return $PAGE;
1789 }
1790
1791 /**
1792  * @deprecated since Moodle 2.0
1793  * You should not be writing page subclasses any more. Just set properties on the
1794  * global $PAGE object to control its behaviour.
1795  */
1796 function page_map_class($type, $classname = NULL) {
1797     global $CFG;
1798
1799     static $mappings = array(
1800         PAGE_COURSE_VIEW => 'page_course',
1801     );
1802
1803     if (!empty($type) && !empty($classname)) {
1804         $mappings[$type] = $classname;
1805     }
1806
1807     if (!isset($mappings[$type])) {
1808         debugging('Page class mapping requested for unknown type: '.$type);
1809         return null;
1810     } else if (empty($classname) && !class_exists($mappings[$type])) {
1811         debugging('Page class mapping for id "'.$type.'" exists but class "'.$mappings[$type].'" is not defined');
1812         return null;
1813     }
1814
1815     return $mappings[$type];
1816 }
1817
1818 /**
1819  * @deprecated since Moodle 2.0
1820  * Parent class from which all Moodle page classes derive
1821  *
1822  * @package    core
1823  * @subpackage lib
1824  * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
1825  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1826  */
1827 class page_base extends moodle_page {
1828     /**
1829      * The numeric identifier of the page being described.
1830      * @var int $id
1831      */
1832     var $id             = NULL;
1833
1834 /// Class Functions
1835
1836     // HTML OUTPUT SECTION
1837
1838     // SELF-REPORTING SECTION
1839
1840     // Simple stuff, do not override this.
1841     function get_id() {
1842         return $this->id;
1843     }
1844
1845     // Initialize the data members of the parent class
1846     function init_quick($data) {
1847         $this->id   = $data->pageid;
1848     }
1849
1850     function init_full() {
1851     }
1852 }
1853
1854 /**
1855  * @deprecated since Moodle 2.0
1856  * Class that models the behavior of a moodle course.
1857  * Although this does nothing, this class declaration should be left for now
1858  * since there may be legacy class doing class page_... extends page_course
1859  *
1860  * @package    core
1861  * @subpackage lib
1862  * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
1863  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1864  */
1865 class page_course extends page_base {
1866 }
1867
1868 /**
1869  * @deprecated since Moodle 2.0
1870  * Class that models the common parts of all activity modules
1871  *
1872  * @package    core
1873  * @subpackage lib
1874  * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
1875  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1876  */
1877 class page_generic_activity extends page_base {
1878     // Although this function is deprecated, it should be left here because
1879     // people upgrading legacy code need to copy it. See
1880     // http://docs.moodle.org/dev/Migrating_your_code_to_the_2.0_rendering_API
1881     function print_header($title, $morenavlinks = NULL, $bodytags = '', $meta = '') {
1882         global $USER, $CFG, $PAGE, $OUTPUT;
1883
1884         $this->init_full();
1885         $replacements = array(
1886             '%fullname%' => format_string($this->activityrecord->name)
1887         );
1888         foreach ($replacements as $search => $replace) {
1889             $title = str_replace($search, $replace, $title);
1890         }
1891
1892         $buttons = '<table><tr><td>'.$OUTPUT->update_module_button($this->modulerecord->id, $this->activityname).'</td>';
1893         if ($this->user_allowed_editing()) {
1894             $buttons .= '<td><form method="get" action="view.php"><div>'.
1895                 '<input type="hidden" name="id" value="'.$this->modulerecord->id.'" />'.
1896                 '<input type="hidden" name="edit" value="'.($this->user_is_editing()?'off':'on').'" />'.
1897                 '<input type="submit" value="'.get_string($this->user_is_editing()?'blockseditoff':'blocksediton').'" /></div></form></td>';
1898         }
1899         $buttons .= '</tr></table>';
1900
1901         if (!empty($morenavlinks) && is_array($morenavlinks)) {
1902             foreach ($morenavlinks as $navitem) {
1903                 if (is_array($navitem) && array_key_exists('name', $navitem)) {
1904                     $link = null;
1905                     if (array_key_exists('link', $navitem)) {
1906                         $link = $navitem['link'];
1907                     }
1908                     $PAGE->navbar->add($navitem['name'], $link);
1909                 }
1910             }
1911         }
1912
1913         $PAGE->set_title($title);
1914         $PAGE->set_heading($this->course->fullname);
1915         $PAGE->set_button($buttons);
1916         echo $OUTPUT->header();
1917     }
1918 }