3 // This file is part of Moodle - http://moodle.org/
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.
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.
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/>.
19 * Block Class and Functions
21 * This file defines the {@link block_manager} class,
25 * @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
26 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
29 defined('MOODLE_INTERNAL') || die();
32 * @deprecated since Moodle 2.0. No longer used.
34 define('BLOCK_MOVE_LEFT', 0x01);
35 define('BLOCK_MOVE_RIGHT', 0x02);
36 define('BLOCK_MOVE_UP', 0x04);
37 define('BLOCK_MOVE_DOWN', 0x08);
38 define('BLOCK_CONFIGURE', 0x10);
42 * Default names for the block regions in the standard theme.
44 define('BLOCK_POS_LEFT', 'side-pre');
45 define('BLOCK_POS_RIGHT', 'side-post');
49 * @deprecated since Moodle 2.0. No longer used.
51 define('BLOCKS_PINNED_TRUE',0);
52 define('BLOCKS_PINNED_FALSE',1);
53 define('BLOCKS_PINNED_BOTH',2);
56 define('BUI_CONTEXTS_FRONTPAGE_ONLY', 0);
57 define('BUI_CONTEXTS_FRONTPAGE_SUBS', 1);
58 define('BUI_CONTEXTS_ENTIRE_SITE', 2);
60 define('BUI_CONTEXTS_CURRENT', 0);
61 define('BUI_CONTEXTS_CURRENT_SUBS', 1);
64 * Exception thrown when someone tried to do something with a block that does
65 * not exist on a page.
67 * @copyright 2009 Tim Hunt
68 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
71 class block_not_on_page_exception extends moodle_exception {
74 * @param int $instanceid the block instance id of the block that was looked for.
75 * @param object $page the current page.
77 public function __construct($instanceid, $page) {
79 $a->instanceid = $instanceid;
80 $a->url = $page->url->out();
81 parent::__construct('blockdoesnotexistonpage', '', $page->url->out(), $a);
86 * This class keeps track of the block that should appear on a moodle_page.
88 * The page to work with as passed to the constructor.
90 * @copyright 2009 Tim Hunt
91 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
96 * The UI normally only shows block weights between -MAX_WEIGHT and MAX_WEIGHT,
97 * although other weights are valid.
99 const MAX_WEIGHT = 10;
101 /// Field declarations =========================================================
104 * the moodle_page we are managing blocks for.
109 /** @var array region name => 1.*/
110 protected $regions = array();
112 /** @var string the region where new blocks are added.*/
113 protected $defaultregion = null;
115 /** @var array will be $DB->get_records('blocks') */
116 protected $allblocks = null;
119 * @var array blocks that this user can add to this page. Will be a subset
120 * of $allblocks, but with array keys block->name. Access this via the
121 * {@link get_addable_blocks()} method to ensure it is lazy-loaded.
123 protected $addableblocks = null;
126 * Will be an array region-name => array(db rows loaded in load_blocks);
129 protected $birecordsbyregion = null;
132 * array region-name => array(block objects); populated as necessary by
133 * the ensure_instances_exist method.
136 protected $blockinstances = array();
139 * array region-name => array(block_contents objects) what actually needs to
140 * be displayed in each region.
143 protected $visibleblockcontent = array();
146 * array region-name => array(block_contents objects) extra block-like things
147 * to be displayed in each region, before the real blocks.
150 protected $extracontent = array();
153 * Used by the block move id, to track whether a block is currently being moved.
155 * When you click on the move icon of a block, first the page needs to reload with
156 * extra UI for choosing a new position for a particular block. In that situation
157 * this field holds the id of the block being moved.
161 protected $movingblock = null;
164 * Show only fake blocks
166 protected $fakeblocksonly = false;
168 /// Constructor ================================================================
172 * @param object $page the moodle_page object object we are managing the blocks for,
173 * or a reasonable faxilimily. (See the comment at the top of this class
174 * and {@link http://en.wikipedia.org/wiki/Duck_typing})
176 public function __construct($page) {
180 /// Getter methods =============================================================
183 * Get an array of all region names on this page where a block may appear
185 * @return array the internal names of the regions on this page where block may appear.
187 public function get_regions() {
188 if (is_null($this->defaultregion)) {
189 $this->page->initialise_theme_and_output();
191 return array_keys($this->regions);
195 * Get the region name of the region blocks are added to by default
197 * @return string the internal names of the region where new blocks are added
198 * by default, and where any blocks from an unrecognised region are shown.
199 * (Imagine that blocks were added with one theme selected, then you switched
200 * to a theme with different block positions.)
202 public function get_default_region() {
203 $this->page->initialise_theme_and_output();
204 return $this->defaultregion;
208 * The list of block types that may be added to this page.
210 * @return array block name => record from block table.
212 public function get_addable_blocks() {
213 $this->check_is_loaded();
215 if (!is_null($this->addableblocks)) {
216 return $this->addableblocks;
220 $this->addableblocks = array();
222 $allblocks = blocks_get_record();
223 if (empty($allblocks)) {
224 return $this->addableblocks;
227 $pageformat = $this->page->pagetype;
228 foreach($allblocks as $block) {
229 if ($block->visible &&
230 (block_method_result($block->name, 'instance_allow_multiple') || !$this->is_block_present($block->name)) &&
231 blocks_name_allowed_in_format($block->name, $pageformat) &&
232 block_method_result($block->name, 'user_can_addto', $this->page)) {
233 $this->addableblocks[$block->name] = $block;
237 return $this->addableblocks;
241 * Given a block name, find out of any of them are currently present in the page
243 * @param string $blockname - the basic name of a block (eg "navigation")
244 * @return boolean - is there one of these blocks in the current page?
246 public function is_block_present($blockname) {
247 if (empty($this->blockinstances)) {
251 foreach ($this->blockinstances as $region) {
252 foreach ($region as $instance) {
253 if (empty($instance->instance->blockname)) {
256 if ($instance->instance->blockname == $blockname) {
265 * Find out if a block type is known by the system
267 * @param string $blockname the name of the type of block.
268 * @param boolean $includeinvisible if false (default) only check 'visible' blocks, that is, blocks enabled by the admin.
269 * @return boolean true if this block in installed.
271 public function is_known_block_type($blockname, $includeinvisible = false) {
272 $blocks = $this->get_installed_blocks();
273 foreach ($blocks as $block) {
274 if ($block->name == $blockname && ($includeinvisible || $block->visible)) {
282 * Find out if a region exists on a page
284 * @param string $region a region name
285 * @return boolean true if this region exists on this page.
287 public function is_known_region($region) {
288 return array_key_exists($region, $this->regions);
292 * Get an array of all blocks within a given region
294 * @param string $region a block region that exists on this page.
295 * @return array of block instances.
297 public function get_blocks_for_region($region) {
298 $this->check_is_loaded();
299 $this->ensure_instances_exist($region);
300 return $this->blockinstances[$region];
304 * Returns an array of block content objects that exist in a region
306 * @param string $region a block region that exists on this page.
307 * @return array of block block_contents objects for all the blocks in a region.
309 public function get_content_for_region($region, $output) {
310 $this->check_is_loaded();
311 $this->ensure_content_created($region, $output);
312 return $this->visibleblockcontent[$region];
316 * Helper method used by get_content_for_region.
317 * @param string $region region name
318 * @param float $weight weight. May be fractional, since you may want to move a block
319 * between ones with weight 2 and 3, say ($weight would be 2.5).
320 * @return string URL for moving block $this->movingblock to this position.
322 protected function get_move_target_url($region, $weight) {
323 return new moodle_url($this->page->url, array('bui_moveid' => $this->movingblock,
324 'bui_newregion' => $region, 'bui_newweight' => $weight, 'sesskey' => sesskey()));
328 * Determine whether a region contains anything. (Either any real blocks, or
329 * the add new block UI.)
331 * (You may wonder why the $output parameter is required. Unfortunately,
332 * because of the way that blocks work, the only reliable way to find out
333 * if a block will be visible is to get the content for output, and to
334 * get the content, you need a renderer. Fortunately, this is not a
335 * performance problem, because we cache the output that is generated, and
336 * in almost every case where we call region_has_content, we are about to
337 * output the blocks anyway, so we are not doing wasted effort.)
339 * @param string $region a block region that exists on this page.
340 * @param object $output a core_renderer. normally the global $OUTPUT.
341 * @return boolean Whether there is anything in this region.
343 public function region_has_content($region, $output) {
345 if (!$this->is_known_region($region)) {
348 $this->check_is_loaded();
349 $this->ensure_content_created($region, $output);
350 // if ($this->page->user_is_editing() && $this->page->user_can_edit_blocks()) {
351 // Mark Nielsen's patch - part 1
352 if ($this->page->user_is_editing() && $this->page->user_can_edit_blocks() && $this->movingblock) {
353 // If editing is on, we need all the block regions visible, for the
357 return !empty($this->visibleblockcontent[$region]) || !empty($this->extracontent[$region]);
361 * Get an array of all of the installed blocks.
363 * @return array contents of the block table.
365 public function get_installed_blocks() {
367 if (is_null($this->allblocks)) {
368 $this->allblocks = $DB->get_records('block');
370 return $this->allblocks;
373 /// Setter methods =============================================================
376 * Add a region to a page
378 * @param string $region add a named region where blocks may appear on the
379 * current page. This is an internal name, like 'side-pre', not a string to
382 public function add_region($region) {
383 $this->check_not_yet_loaded();
384 $this->regions[$region] = 1;
388 * Add an array of regions
391 * @param array $regions this utility method calls add_region for each array element.
393 public function add_regions($regions) {
394 foreach ($regions as $region) {
395 $this->add_region($region);
400 * Set the default region for new blocks on the page
402 * @param string $defaultregion the internal names of the region where new
403 * blocks should be added by default, and where any blocks from an
404 * unrecognised region are shown.
406 public function set_default_region($defaultregion) {
407 $this->check_not_yet_loaded();
408 if ($defaultregion) {
409 $this->check_region_is_known($defaultregion);
411 $this->defaultregion = $defaultregion;
415 * Add something that looks like a block, but which isn't an actual block_instance,
418 * @param block_contents $bc the content of the block-like thing.
419 * @param string $region a block region that exists on this page.
421 public function add_fake_block($bc, $region) {
422 $this->page->initialise_theme_and_output();
423 if (!$this->is_known_region($region)) {
424 $region = $this->get_default_region();
426 if (array_key_exists($region, $this->visibleblockcontent)) {
427 throw new coding_exception('block_manager has already prepared the blocks in region ' .
428 $region . 'for output. It is too late to add a fake block.');
430 $this->extracontent[$region][] = $bc;
434 * When the block_manager class was created, the {@link add_fake_block()}
435 * was called add_pretend_block, which is inconsisted with
436 * {@link show_only_fake_blocks()}. To fix this inconsistency, this method
437 * was renamed to add_fake_block. Please update your code.
438 * @param block_contents $bc the content of the block-like thing.
439 * @param string $region a block region that exists on this page.
441 public function add_pretend_block($bc, $region) {
442 debugging(DEBUG_DEVELOPER, 'add_pretend_block has been renamed to add_fake_block. Please rename the method call in your code.');
443 $this->add_fake_block($bc, $region);
447 * Checks to see whether all of the blocks within the given region are docked
449 * @see region_uses_dock
450 * @param string $region
451 * @return bool True if all of the blocks within that region are docked
453 public function region_completely_docked($region, $output) {
454 if (!$this->page->theme->enable_dock) {
457 $this->check_is_loaded();
458 $this->ensure_content_created($region, $output);
459 foreach($this->visibleblockcontent[$region] as $instance) {
460 if (!empty($instance->content) && !get_user_preferences('docked_block_instance_'.$instance->blockinstanceid, 0)) {
468 * Checks to see whether any of the blocks within the given regions are docked
470 * @see region_completely_docked
471 * @param array|string $regions array of regions (or single region)
472 * @return bool True if any of the blocks within that region are docked
474 public function region_uses_dock($regions, $output) {
475 if (!$this->page->theme->enable_dock) {
478 $this->check_is_loaded();
479 foreach((array)$regions as $region) {
480 $this->ensure_content_created($region, $output);
481 foreach($this->visibleblockcontent[$region] as $instance) {
482 if(!empty($instance->content) && get_user_preferences('docked_block_instance_'.$instance->blockinstanceid, 0)) {
490 /// Actions ====================================================================
493 * This method actually loads the blocks for our page from the database.
495 * @param boolean|null $includeinvisible
496 * null (default) - load hidden blocks if $this->page->user_is_editing();
497 * true - load hidden blocks.
498 * false - don't load hidden blocks.
500 public function load_blocks($includeinvisible = null) {
503 if (!is_null($this->birecordsbyregion)) {
508 if ($CFG->version < 2009050619) {
509 // Upgrade/install not complete. Don't try too show any blocks.
510 $this->birecordsbyregion = array();
514 // Ensure we have been initialised.
515 if (is_null($this->defaultregion)) {
516 $this->page->initialise_theme_and_output();
517 // If there are still no block regions, then there are no blocks on this page.
518 if (empty($this->regions)) {
519 $this->birecordsbyregion = array();
524 // Check if we need to load normal blocks
525 if ($this->fakeblocksonly) {
526 $this->birecordsbyregion = $this->prepare_per_region_arrays();
530 if (is_null($includeinvisible)) {
531 $includeinvisible = $this->page->user_is_editing();
533 if ($includeinvisible) {
536 $visiblecheck = 'AND (bp.visible = 1 OR bp.visible IS NULL)';
539 $context = $this->page->context;
540 $contexttest = 'bi.parentcontextid = :contextid2';
541 $parentcontextparams = array();
542 $parentcontextids = get_parent_contexts($context);
543 if ($parentcontextids) {
544 list($parentcontexttest, $parentcontextparams) =
545 $DB->get_in_or_equal($parentcontextids, SQL_PARAMS_NAMED, 'parentcontext');
546 $contexttest = "($contexttest OR (bi.showinsubcontexts = 1 AND bi.parentcontextid $parentcontexttest))";
549 $pagetypepatterns = matching_page_type_patterns($this->page->pagetype);
550 list($pagetypepatterntest, $pagetypepatternparams) =
551 $DB->get_in_or_equal($pagetypepatterns, SQL_PARAMS_NAMED, 'pagetypepatterntest');
553 list($ccselect, $ccjoin) = context_instance_preload_sql('bi.id', CONTEXT_BLOCK, 'ctx');
556 'subpage1' => $this->page->subpage,
557 'subpage2' => $this->page->subpage,
558 'contextid1' => $context->id,
559 'contextid2' => $context->id,
560 'pagetype' => $this->page->pagetype,
562 if ($this->page->subpage === '') {
563 $params['subpage1'] = $DB->sql_empty();
564 $params['subpage2'] = $DB->sql_empty();
568 bp.id AS blockpositionid,
571 bi.showinsubcontexts,
576 COALESCE(bp.visible, 1) AS visible,
577 COALESCE(bp.region, bi.defaultregion) AS region,
578 COALESCE(bp.weight, bi.defaultweight) AS weight,
582 FROM {block_instances} bi
583 JOIN {block} b ON bi.blockname = b.name
584 LEFT JOIN {block_positions} bp ON bp.blockinstanceid = bi.id
585 AND bp.contextid = :contextid1
586 AND bp.pagetype = :pagetype
587 AND bp.subpage = :subpage1
592 AND bi.pagetypepattern $pagetypepatterntest
593 AND (bi.subpagepattern IS NULL OR bi.subpagepattern = :subpage2)
598 COALESCE(bp.region, bi.defaultregion),
599 COALESCE(bp.weight, bi.defaultweight),
601 $blockinstances = $DB->get_recordset_sql($sql, $params + $parentcontextparams + $pagetypepatternparams);
603 $this->birecordsbyregion = $this->prepare_per_region_arrays();
605 foreach ($blockinstances as $bi) {
606 context_instance_preload($bi);
607 if ($this->is_known_region($bi->region)) {
608 $this->birecordsbyregion[$bi->region][] = $bi;
614 // Pages don't necessarily have a defaultregion. The one time this can
615 // happen is when there are no theme block regions, but the script itself
616 // has a block region in the main content area.
617 if (!empty($this->defaultregion)) {
618 $this->birecordsbyregion[$this->defaultregion] =
619 array_merge($this->birecordsbyregion[$this->defaultregion], $unknown);
624 * Add a block to the current page, or related pages. The block is added to
625 * context $this->page->contextid. If $pagetypepattern $subpagepattern
627 * @param string $blockname The type of block to add.
628 * @param string $region the block region on this page to add the block to.
629 * @param integer $weight determines the order where this block appears in the region.
630 * @param boolean $showinsubcontexts whether this block appears in subcontexts, or just the current context.
631 * @param string|null $pagetypepattern which page types this block should appear on. Defaults to just the current page type.
632 * @param string|null $subpagepattern which subpage this block should appear on. NULL = any (the default), otherwise only the specified subpage.
634 public function add_block($blockname, $region, $weight, $showinsubcontexts, $pagetypepattern = NULL, $subpagepattern = NULL) {
636 // Allow invisible blocks because this is used when adding default page blocks, which
637 // might include invisible ones if the user makes some default blocks invisible
638 $this->check_known_block_type($blockname, true);
639 $this->check_region_is_known($region);
641 if (empty($pagetypepattern)) {
642 $pagetypepattern = $this->page->pagetype;
645 $blockinstance = new stdClass;
646 $blockinstance->blockname = $blockname;
647 $blockinstance->parentcontextid = $this->page->context->id;
648 $blockinstance->showinsubcontexts = !empty($showinsubcontexts);
649 $blockinstance->pagetypepattern = $pagetypepattern;
650 $blockinstance->subpagepattern = $subpagepattern;
651 $blockinstance->defaultregion = $region;
652 $blockinstance->defaultweight = $weight;
653 $blockinstance->configdata = '';
654 $blockinstance->id = $DB->insert_record('block_instances', $blockinstance);
656 // Ensure the block context is created.
657 get_context_instance(CONTEXT_BLOCK, $blockinstance->id);
659 // If the new instance was created, allow it to do additional setup
660 if ($block = block_instance($blockname, $blockinstance)) {
661 $block->instance_create();
665 public function add_block_at_end_of_default_region($blockname) {
666 $defaulregion = $this->get_default_region();
668 $lastcurrentblock = end($this->birecordsbyregion[$defaulregion]);
669 if ($lastcurrentblock) {
670 $weight = $lastcurrentblock->weight + 1;
675 if ($this->page->subpage) {
676 $subpage = $this->page->subpage;
681 // Special case. Course view page type include the course format, but we
682 // want to add the block non-format-specifically.
683 $pagetypepattern = $this->page->pagetype;
684 if (strpos($pagetypepattern, 'course-view') === 0) {
685 $pagetypepattern = 'course-view-*';
688 // We should end using this for ALL the blocks, making always the 1st option
689 // the default one to be used. Until then, this is one hack to avoid the
690 // 'pagetypewarning' message on blocks initial edition (MDL-27829) caused by
691 // non-existing $pagetypepattern set. This way at least we guarantee one "valid"
692 // (the FIRST $pagetypepattern will be set)
694 // We are applying it to all blocks created in mod pages for now and only if the
695 // default pagetype is not one of the available options
696 if (preg_match('/^mod-.*-/', $pagetypepattern)) {
697 $pagetypelist = generate_page_type_patterns($this->page->pagetype, null, $this->page->context);
698 // Only go for the first if the pagetype is not a valid option
699 if (is_array($pagetypelist) && !array_key_exists($pagetypepattern, $pagetypelist)) {
700 $pagetypepattern = key($pagetypelist);
703 // Surely other pages like course-report will need this too, they just are not important
704 // enough now. This will be decided in the coming days. (MDL-27829, MDL-28150)
706 $this->add_block($blockname, $defaulregion, $weight, false, $pagetypepattern, $subpage);
710 * Convenience method, calls add_block repeatedly for all the blocks in $blocks.
712 * @param array $blocks array with array keys the region names, and values an array of block names.
713 * @param string $pagetypepattern optional. Passed to @see add_block()
714 * @param string $subpagepattern optional. Passed to @see add_block()
716 public function add_blocks($blocks, $pagetypepattern = NULL, $subpagepattern = NULL, $showinsubcontexts=false, $weight=0) {
717 $this->add_regions(array_keys($blocks));
718 foreach ($blocks as $region => $regionblocks) {
720 foreach ($regionblocks as $blockname) {
721 $this->add_block($blockname, $region, $weight, $showinsubcontexts, $pagetypepattern, $subpagepattern);
728 * Move a block to a new position on this page.
730 * If this block cannot appear on any other pages, then we change defaultposition/weight
731 * in the block_instances table. Otherwise we just set the position on this page.
733 * @param $blockinstanceid the block instance id.
734 * @param $newregion the new region name.
735 * @param $newweight the new weight.
737 public function reposition_block($blockinstanceid, $newregion, $newweight) {
740 $this->check_region_is_known($newregion);
741 $inst = $this->find_instance($blockinstanceid);
743 $bi = $inst->instance;
744 if ($bi->weight == $bi->defaultweight && $bi->region == $bi->defaultregion &&
745 !$bi->showinsubcontexts && strpos($bi->pagetypepattern, '*') === false &&
746 (!$this->page->subpage || $bi->subpagepattern)) {
748 // Set default position
749 $newbi = new stdClass;
750 $newbi->id = $bi->id;
751 $newbi->defaultregion = $newregion;
752 $newbi->defaultweight = $newweight;
753 $DB->update_record('block_instances', $newbi);
755 if ($bi->blockpositionid) {
757 $bp->id = $bi->blockpositionid;
758 $bp->region = $newregion;
759 $bp->weight = $newweight;
760 $DB->update_record('block_positions', $bp);
764 // Just set position on this page.
766 $bp->region = $newregion;
767 $bp->weight = $newweight;
769 if ($bi->blockpositionid) {
770 $bp->id = $bi->blockpositionid;
771 $DB->update_record('block_positions', $bp);
774 $bp->blockinstanceid = $bi->id;
775 $bp->contextid = $this->page->context->id;
776 $bp->pagetype = $this->page->pagetype;
777 if ($this->page->subpage) {
778 $bp->subpage = $this->page->subpage;
782 $bp->visible = $bi->visible;
783 $DB->insert_record('block_positions', $bp);
789 * Find a given block by its instance id
791 * @param integer $instanceid
794 public function find_instance($instanceid) {
795 foreach ($this->regions as $region => $notused) {
796 $this->ensure_instances_exist($region);
797 foreach($this->blockinstances[$region] as $instance) {
798 if ($instance->instance->id == $instanceid) {
803 throw new block_not_on_page_exception($instanceid, $this->page);
806 /// Inner workings =============================================================
809 * Check whether the page blocks have been loaded yet
811 * @return void Throws coding exception if already loaded
813 protected function check_not_yet_loaded() {
814 if (!is_null($this->birecordsbyregion)) {
815 throw new coding_exception('block_manager has already loaded the blocks, to it is too late to change things that might affect which blocks are visible.');
820 * Check whether the page blocks have been loaded yet
822 * Nearly identical to the above function {@link check_not_yet_loaded()} except different message
824 * @return void Throws coding exception if already loaded
826 protected function check_is_loaded() {
827 if (is_null($this->birecordsbyregion)) {
828 throw new coding_exception('block_manager has not yet loaded the blocks, to it is too soon to request the information you asked for.');
833 * Check if a block type is known and usable
835 * @param string $blockname The block type name to search for
836 * @param bool $includeinvisible Include disabled block types in the initial pass
837 * @return void Coding Exception thrown if unknown or not enabled
839 protected function check_known_block_type($blockname, $includeinvisible = false) {
840 if (!$this->is_known_block_type($blockname, $includeinvisible)) {
841 if ($this->is_known_block_type($blockname, true)) {
842 throw new coding_exception('Unknown block type ' . $blockname);
844 throw new coding_exception('Block type ' . $blockname . ' has been disabled by the administrator.');
850 * Check if a region is known by its name
852 * @param string $region
853 * @return void Coding Exception thrown if the region is not known
855 protected function check_region_is_known($region) {
856 if (!$this->is_known_region($region)) {
857 throw new coding_exception('Trying to reference an unknown block region ' . $region);
862 * Returns an array of region names as keys and nested arrays for values
864 * @return array an array where the array keys are the region names, and the array
865 * values are empty arrays.
867 protected function prepare_per_region_arrays() {
869 foreach ($this->regions as $region => $notused) {
870 $result[$region] = array();
876 * Create a set of new block instance from a record array
878 * @param array $birecords An array of block instance records
879 * @return array An array of instantiated block_instance objects
881 protected function create_block_instances($birecords) {
883 foreach ($birecords as $record) {
884 if ($blockobject = block_instance($record->blockname, $record, $this->page)) {
885 $results[] = $blockobject;
892 * Create all the block instances for all the blocks that were loaded by
893 * load_blocks. This is used, for example, to ensure that all blocks get a
894 * chance to initialise themselves via the {@link block_base::specialize()}
895 * method, before any output is done.
897 public function create_all_block_instances() {
898 foreach ($this->get_regions() as $region) {
899 $this->ensure_instances_exist($region);
904 * Return an array of content objects from a set of block instances
906 * @param array $instances An array of block instances
907 * @param renderer_base The renderer to use.
908 * @param string $region the region name.
909 * @return array An array of block_content (and possibly block_move_target) objects.
911 protected function create_block_contents($instances, $output, $region) {
916 if ($this->movingblock) {
917 $first = reset($instances);
919 $lastweight = $first->instance->weight - 2;
922 $strmoveblockhere = get_string('moveblockhere', 'block');
925 foreach ($instances as $instance) {
926 $content = $instance->get_content_for_output($output);
927 if (empty($content)) {
931 if ($this->movingblock && $lastweight != $instance->instance->weight &&
932 $content->blockinstanceid != $this->movingblock && $lastblock != $this->movingblock) {
933 $results[] = new block_move_target($strmoveblockhere, $this->get_move_target_url($region, ($lastweight + $instance->instance->weight)/2));
936 if ($content->blockinstanceid == $this->movingblock) {
937 $content->add_class('beingmoved');
938 $content->annotation .= get_string('movingthisblockcancel', 'block',
939 html_writer::link($this->page->url, get_string('cancel')));
942 $results[] = $content;
943 $lastweight = $instance->instance->weight;
944 $lastblock = $instance->instance->id;
947 if ($this->movingblock && $lastblock != $this->movingblock) {
948 $results[] = new block_move_target($strmoveblockhere, $this->get_move_target_url($region, $lastweight + 1));
954 * Ensure block instances exist for a given region
956 * @param string $region Check for bi's with the instance with this name
958 protected function ensure_instances_exist($region) {
959 $this->check_region_is_known($region);
960 if (!array_key_exists($region, $this->blockinstances)) {
961 $this->blockinstances[$region] =
962 $this->create_block_instances($this->birecordsbyregion[$region]);
967 * Ensure that there is some content within the given region
969 * @param string $region The name of the region to check
971 protected function ensure_content_created($region, $output) {
972 $this->ensure_instances_exist($region);
973 if (!array_key_exists($region, $this->visibleblockcontent)) {
975 if (array_key_exists($region, $this->extracontent)) {
976 $contents = $this->extracontent[$region];
978 $contents = array_merge($contents, $this->create_block_contents($this->blockinstances[$region], $output, $region));
979 if ($region == $this->defaultregion) {
980 $addblockui = block_add_block_ui($this->page, $output);
982 $contents[] = $addblockui;
985 $this->visibleblockcontent[$region] = $contents;
989 /// Process actions from the URL ===============================================
992 * Get the appropriate list of editing icons for a block. This is used
993 * to set {@link block_contents::$controls} in {@link block_base::get_contents_for_output()}.
995 * @param $output The core_renderer to use when generating the output. (Need to get icon paths.)
996 * @return an array in the format for {@link block_contents::$controls}
998 public function edit_controls($block) {
1001 if (!isset($CFG->undeletableblocktypes) || (!is_array($CFG->undeletableblocktypes) && !is_string($CFG->undeletableblocktypes))) {
1002 $undeletableblocktypes = array('navigation','settings');
1003 } else if (is_string($CFG->undeletableblocktypes)) {
1004 $undeletableblocktypes = explode(',', $CFG->undeletableblocktypes);
1006 $undeletableblocktypes = $CFG->undeletableblocktypes;
1009 $controls = array();
1010 $actionurl = $this->page->url->out(false, array('sesskey'=> sesskey()));
1012 if ($this->page->user_can_edit_blocks()) {
1014 $controls[] = array('url' => $actionurl . '&bui_moveid=' . $block->instance->id,
1015 'icon' => 't/move', 'caption' => get_string('move'));
1018 if ($this->page->user_can_edit_blocks() || $block->user_can_edit()) {
1019 // Edit config icon - always show - needed for positioning UI.
1020 $controls[] = array('url' => $actionurl . '&bui_editid=' . $block->instance->id,
1021 'icon' => 't/edit', 'caption' => get_string('configuration'));
1024 if ($this->page->user_can_edit_blocks() && $block->user_can_edit() && $block->user_can_addto($this->page)) {
1025 if (!in_array($block->instance->blockname, $undeletableblocktypes)
1026 || !in_array($block->instance->pagetypepattern, array('*', 'site-index'))
1027 || $block->instance->parentcontextid != SITEID) {
1029 $controls[] = array('url' => $actionurl . '&bui_deleteid=' . $block->instance->id,
1030 'icon' => 't/delete', 'caption' => get_string('delete'));
1034 if ($this->page->user_can_edit_blocks() && $block->instance_can_be_hidden()) {
1036 if ($block->instance->visible) {
1037 $controls[] = array('url' => $actionurl . '&bui_hideid=' . $block->instance->id,
1038 'icon' => 't/hide', 'caption' => get_string('hide'));
1040 $controls[] = array('url' => $actionurl . '&bui_showid=' . $block->instance->id,
1041 'icon' => 't/show', 'caption' => get_string('show'));
1045 // Assign roles icon.
1046 if (has_capability('moodle/role:assign', $block->context)) {
1047 //TODO: please note it is sloppy to pass urls through page parameters!!
1048 // it is shortened because some web servers (e.g. IIS by default) give
1049 // a 'security' error if you try to pass a full URL as a GET parameter in another URL.
1050 $return = $this->page->url->out(false);
1051 $return = str_replace($CFG->wwwroot . '/', '', $return);
1053 $controls[] = array('url' => $CFG->wwwroot . '/' . $CFG->admin .
1054 '/roles/assign.php?contextid=' . $block->context->id . '&returnurl=' . urlencode($return),
1055 'icon' => 'i/roles', 'caption' => get_string('assignroles', 'role'));
1062 * Process any block actions that were specified in the URL.
1064 * @return boolean true if anything was done. False if not.
1066 public function process_url_actions() {
1067 if (!$this->page->user_is_editing()) {
1070 return $this->process_url_add() || $this->process_url_delete() ||
1071 $this->process_url_show_hide() || $this->process_url_edit() ||
1072 $this->process_url_move();
1076 * Handle adding a block.
1077 * @return boolean true if anything was done. False if not.
1079 public function process_url_add() {
1080 $blocktype = optional_param('bui_addblock', null, PARAM_PLUGIN);
1087 if (!$this->page->user_can_edit_blocks()) {
1088 throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('addblock'));
1091 if (!array_key_exists($blocktype, $this->get_addable_blocks())) {
1092 throw new moodle_exception('cannotaddthisblocktype', '', $this->page->url->out(), $blocktype);
1095 $this->add_block_at_end_of_default_region($blocktype);
1097 // If the page URL was a guess, it will contain the bui_... param, so we must make sure it is not there.
1098 $this->page->ensure_param_not_in_url('bui_addblock');
1104 * Handle deleting a block.
1105 * @return boolean true if anything was done. False if not.
1107 public function process_url_delete() {
1108 $blockid = optional_param('bui_deleteid', null, PARAM_INTEGER);
1115 $block = $this->page->blocks->find_instance($blockid);
1117 if (!$block->user_can_edit() || !$this->page->user_can_edit_blocks() || !$block->user_can_addto($this->page)) {
1118 throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('deleteablock'));
1121 blocks_delete_instance($block->instance);
1123 // If the page URL was a guess, it will contain the bui_... param, so we must make sure it is not there.
1124 $this->page->ensure_param_not_in_url('bui_deleteid');
1130 * Handle showing or hiding a block.
1131 * @return boolean true if anything was done. False if not.
1133 public function process_url_show_hide() {
1134 if ($blockid = optional_param('bui_hideid', null, PARAM_INTEGER)) {
1136 } else if ($blockid = optional_param('bui_showid', null, PARAM_INTEGER)) {
1144 $block = $this->page->blocks->find_instance($blockid);
1146 if (!$this->page->user_can_edit_blocks()) {
1147 throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('hideshowblocks'));
1148 } else if (!$block->instance_can_be_hidden()) {
1152 blocks_set_visibility($block->instance, $this->page, $newvisibility);
1154 // If the page URL was a guses, it will contain the bui_... param, so we must make sure it is not there.
1155 $this->page->ensure_param_not_in_url('bui_hideid');
1156 $this->page->ensure_param_not_in_url('bui_showid');
1162 * Handle showing/processing the submission from the block editing form.
1163 * @return boolean true if the form was submitted and the new config saved. Does not
1164 * return if the editing form was displayed. False otherwise.
1166 public function process_url_edit() {
1167 global $CFG, $DB, $PAGE, $OUTPUT;
1169 $blockid = optional_param('bui_editid', null, PARAM_INTEGER);
1175 require_once($CFG->dirroot . '/blocks/edit_form.php');
1177 $block = $this->find_instance($blockid);
1179 if (!$block->user_can_edit() && !$this->page->user_can_edit_blocks()) {
1180 throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('editblock'));
1183 $editpage = new moodle_page();
1184 $editpage->set_pagelayout('admin');
1185 $editpage->set_course($this->page->course);
1186 //$editpage->set_context($block->context);
1187 $editpage->set_context($this->page->context);
1188 if ($this->page->cm) {
1189 $editpage->set_cm($this->page->cm);
1191 $editurlbase = str_replace($CFG->wwwroot . '/', '/', $this->page->url->out_omit_querystring());
1192 $editurlparams = $this->page->url->params();
1193 $editurlparams['bui_editid'] = $blockid;
1194 $editpage->set_url($editurlbase, $editurlparams);
1195 $editpage->set_block_actions_done();
1196 // At this point we are either going to redirect, or display the form, so
1197 // overwrite global $PAGE ready for this. (Formslib refers to it.)
1199 //some functions like MoodleQuickForm::addHelpButton use $OUTPUT so we need to replace that to
1200 $output = $editpage->get_renderer('core');
1203 $formfile = $CFG->dirroot . '/blocks/' . $block->name() . '/edit_form.php';
1204 if (is_readable($formfile)) {
1205 require_once($formfile);
1206 $classname = 'block_' . $block->name() . '_edit_form';
1207 if (!class_exists($classname)) {
1208 $classname = 'block_edit_form';
1211 $classname = 'block_edit_form';
1214 $mform = new $classname($editpage->url, $block, $this->page);
1215 $mform->set_data($block->instance);
1217 if ($mform->is_cancelled()) {
1218 redirect($this->page->url);
1220 } else if ($data = $mform->get_data()) {
1222 $bi->id = $block->instance->id;
1223 $bi->pagetypepattern = $data->bui_pagetypepattern;
1224 if (empty($data->bui_subpagepattern) || $data->bui_subpagepattern == '%@NULL@%') {
1225 $bi->subpagepattern = null;
1227 $bi->subpagepattern = $data->bui_subpagepattern;
1230 $parentcontext = get_context_instance_by_id($data->bui_parentcontextid);
1231 $systemcontext = get_context_instance(CONTEXT_SYSTEM);
1233 // Updating stickiness and contexts. See MDL-21375 for details.
1234 if (has_capability('moodle/site:manageblocks', $parentcontext)) { // Check permissions in destination
1235 // Explicitly set the context
1236 $bi->parentcontextid = $parentcontext->id;
1238 // Should the block be sticky
1239 if ($data->bui_contexts == BUI_CONTEXTS_ENTIRE_SITE or $data->bui_contexts == BUI_CONTEXTS_FRONTPAGE_SUBS) {
1240 $bi->showinsubcontexts = true;
1242 $bi->showinsubcontexts = false;
1245 // If the block wants to be system-wide, then explicitly set that
1246 if ($data->bui_contexts == BUI_CONTEXTS_ENTIRE_SITE) { // Only possible on a frontpage or system page
1247 $bi->parentcontextid = $systemcontext->id;
1249 } else { // The block doesn't want to be system-wide, so let's ensure that
1250 if ($parentcontext->id == $systemcontext->id) { // We need to move it to the front page
1251 $frontpagecontext = get_context_instance(CONTEXT_COURSE, SITEID);
1252 $bi->parentcontextid = $frontpagecontext->id;
1253 if ($data->bui_contexts == BUI_CONTEXTS_FRONTPAGE_ONLY) {
1254 // If the front page only is specified, the page type setting is ignored
1255 // as explicitely set to site-index
1256 $bi->pagetypepattern = 'site-index';
1262 $bits = explode('-', $bi->pagetypepattern);
1263 // hacks for some contexts
1264 if (($parentcontext->contextlevel == CONTEXT_COURSE) && ($parentcontext->instanceid != SITEID)) {
1265 // For course context
1266 // is page type pattern is mod-*, change showinsubcontext to 1
1267 if ($bits[0] == 'mod' || $bi->pagetypepattern == '*') {
1268 $bi->showinsubcontexts = 1;
1270 $bi->showinsubcontexts = 0;
1272 } else if ($parentcontext->contextlevel == CONTEXT_USER) {
1274 // subpagepattern should be null
1275 if ($bits[0] == 'user' or $bits[0] == 'my') {
1276 // we don't need subpagepattern in usercontext
1277 $bi->subpagepattern = null;
1281 $bi->defaultregion = $data->bui_defaultregion;
1282 $bi->defaultweight = $data->bui_defaultweight;
1283 $DB->update_record('block_instances', $bi);
1285 if (!empty($block->config)) {
1286 $config = clone($block->config);
1288 $config = new stdClass;
1290 foreach ($data as $configfield => $value) {
1291 if (strpos($configfield, 'config_') !== 0) {
1294 $field = substr($configfield, 7);
1295 $config->$field = $value;
1297 $block->instance_config_save($config);
1300 $bp->visible = $data->bui_visible;
1301 $bp->region = $data->bui_region;
1302 $bp->weight = $data->bui_weight;
1303 $needbprecord = !$data->bui_visible || $data->bui_region != $data->bui_defaultregion ||
1304 $data->bui_weight != $data->bui_defaultweight;
1306 if ($block->instance->blockpositionid && !$needbprecord) {
1307 $DB->delete_records('block_positions', array('id' => $block->instance->blockpositionid));
1309 } else if ($block->instance->blockpositionid && $needbprecord) {
1310 $bp->id = $block->instance->blockpositionid;
1311 $DB->update_record('block_positions', $bp);
1313 } else if ($needbprecord) {
1314 $bp->blockinstanceid = $block->instance->id;
1315 $bp->contextid = $this->page->context->id;
1316 $bp->pagetype = $this->page->pagetype;
1317 if ($this->page->subpage) {
1318 $bp->subpage = $this->page->subpage;
1322 $DB->insert_record('block_positions', $bp);
1325 redirect($this->page->url);
1328 $strheading = get_string('blockconfiga', 'moodle', $block->get_title());
1329 $editpage->set_title($strheading);
1330 $editpage->set_heading($strheading);
1331 $bits = explode('-', $this->page->pagetype);
1332 if ($bits[0] == 'tag' && !empty($this->page->subpage)) {
1333 // better navbar for tag pages
1334 $editpage->navbar->add(get_string('tags'), new moodle_url('/tag/'));
1335 $tag = tag_get('id', $this->page->subpage, '*');
1336 // tag search page doesn't have subpageid
1338 $editpage->navbar->add($tag->name, new moodle_url('/tag/index.php', array('id'=>$tag->id)));
1341 $editpage->navbar->add($block->get_title());
1342 $editpage->navbar->add(get_string('configuration'));
1343 echo $output->header();
1344 echo $output->heading($strheading, 2);
1346 echo $output->footer();
1352 * Handle showing/processing the submission from the block editing form.
1353 * @return boolean true if the form was submitted and the new config saved. Does not
1354 * return if the editing form was displayed. False otherwise.
1356 public function process_url_move() {
1357 global $CFG, $DB, $PAGE;
1359 $blockid = optional_param('bui_moveid', null, PARAM_INTEGER);
1366 $block = $this->find_instance($blockid);
1368 if (!$this->page->user_can_edit_blocks()) {
1369 throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('editblock'));
1372 $newregion = optional_param('bui_newregion', '', PARAM_ALPHANUMEXT);
1373 $newweight = optional_param('bui_newweight', null, PARAM_FLOAT);
1374 if (!$newregion || is_null($newweight)) {
1375 // Don't have a valid target position yet, must be just starting the move.
1376 $this->movingblock = $blockid;
1377 $this->page->ensure_param_not_in_url('bui_moveid');
1381 if (!$this->is_known_region($newregion)) {
1382 throw new moodle_exception('unknownblockregion', '', $this->page->url, $newregion);
1385 // Move this block. This may involve moving other nearby blocks.
1386 $blocks = $this->birecordsbyregion[$newregion];
1388 $maxweight = self::MAX_WEIGHT;
1389 $minweight = -self::MAX_WEIGHT;
1391 // Initialise the used weights and spareweights array with the default values
1392 $spareweights = array();
1393 $usedweights = array();
1394 for ($i = $minweight; $i <= $maxweight; $i++) {
1395 $spareweights[$i] = $i;
1396 $usedweights[$i] = array();
1399 // Check each block and sort out where we have used weights
1400 foreach ($blocks as $bi) {
1401 if ($bi->weight > $maxweight) {
1402 // If this statement is true then the blocks weight is more than the
1403 // current maximum. To ensure that we can get the best block position
1404 // we will initialise elements within the usedweights and spareweights
1405 // arrays between the blocks weight (which will then be the new max) and
1407 $parseweight = $bi->weight;
1408 while (!array_key_exists($parseweight, $usedweights)) {
1409 $usedweights[$parseweight] = array();
1410 $spareweights[$parseweight] = $parseweight;
1413 $maxweight = $bi->weight;
1414 } else if ($bi->weight < $minweight) {
1415 // As above except this time the blocks weight is LESS than the
1416 // the current minimum, so we will initialise the array from the
1417 // blocks weight (new minimum) to the current minimum
1418 $parseweight = $bi->weight;
1419 while (!array_key_exists($parseweight, $usedweights)) {
1420 $usedweights[$parseweight] = array();
1421 $spareweights[$parseweight] = $parseweight;
1424 $minweight = $bi->weight;
1426 if ($bi->id != $block->instance->id) {
1427 unset($spareweights[$bi->weight]);
1428 $usedweights[$bi->weight][] = $bi->id;
1432 // First we find the nearest gap in the list of weights.
1433 $bestdistance = max(abs($newweight - self::MAX_WEIGHT), abs($newweight + self::MAX_WEIGHT)) + 1;
1435 foreach ($spareweights as $spareweight) {
1436 if (abs($newweight - $spareweight) < $bestdistance) {
1437 $bestdistance = abs($newweight - $spareweight);
1438 $bestgap = $spareweight;
1442 // If there is no gap, we have to go outside -self::MAX_WEIGHT .. self::MAX_WEIGHT.
1443 if (is_null($bestgap)) {
1444 $bestgap = self::MAX_WEIGHT + 1;
1445 while (!empty($usedweights[$bestgap])) {
1450 // Now we know the gap we are aiming for, so move all the blocks along.
1451 if ($bestgap < $newweight) {
1452 $newweight = floor($newweight);
1453 for ($weight = $bestgap + 1; $weight <= $newweight; $weight++) {
1454 foreach ($usedweights[$weight] as $biid) {
1455 $this->reposition_block($biid, $newregion, $weight - 1);
1458 $this->reposition_block($block->instance->id, $newregion, $newweight);
1460 $newweight = ceil($newweight);
1461 for ($weight = $bestgap - 1; $weight >= $newweight; $weight--) {
1462 foreach ($usedweights[$weight] as $biid) {
1463 $this->reposition_block($biid, $newregion, $weight + 1);
1466 $this->reposition_block($block->instance->id, $newregion, $newweight);
1469 $this->page->ensure_param_not_in_url('bui_moveid');
1470 $this->page->ensure_param_not_in_url('bui_newregion');
1471 $this->page->ensure_param_not_in_url('bui_newweight');
1476 * Turns the display of normal blocks either on or off.
1478 * @param bool $setting
1480 public function show_only_fake_blocks($setting = true) {
1481 $this->fakeblocksonly = $setting;
1485 /// Helper functions for working with block classes ============================
1488 * Call a class method (one that does not require a block instance) on a block class.
1490 * @param string $blockname the name of the block.
1491 * @param string $method the method name.
1492 * @param array $param parameters to pass to the method.
1493 * @return mixed whatever the method returns.
1495 function block_method_result($blockname, $method, $param = NULL) {
1496 if(!block_load_class($blockname)) {
1499 return call_user_func(array('block_'.$blockname, $method), $param);
1503 * Creates a new instance of the specified block class.
1505 * @param string $blockname the name of the block.
1506 * @param $instance block_instances DB table row (optional).
1507 * @param moodle_page $page the page this block is appearing on.
1508 * @return block_base the requested block instance.
1510 function block_instance($blockname, $instance = NULL, $page = NULL) {
1511 if(!block_load_class($blockname)) {
1514 $classname = 'block_'.$blockname;
1515 $retval = new $classname;
1516 if($instance !== NULL) {
1517 if (is_null($page)) {
1521 $retval->_load_instance($instance, $page);
1527 * Load the block class for a particular type of block.
1529 * @param string $blockname the name of the block.
1530 * @return boolean success or failure.
1532 function block_load_class($blockname) {
1535 if(empty($blockname)) {
1539 $classname = 'block_'.$blockname;
1541 if(class_exists($classname)) {
1545 $blockpath = $CFG->dirroot.'/blocks/'.$blockname.'/block_'.$blockname.'.php';
1547 if (file_exists($blockpath)) {
1548 require_once($CFG->dirroot.'/blocks/moodleblock.class.php');
1549 include_once($blockpath);
1551 //debugging("$blockname code does not exist in $blockpath", DEBUG_DEVELOPER);
1555 return class_exists($classname);
1559 * Given a specific page type, return all the page type patterns that might
1562 * @param string $pagetype for example 'course-view-weeks' or 'mod-quiz-view'.
1563 * @return array an array of all the page type patterns that might match this page type.
1565 function matching_page_type_patterns($pagetype) {
1566 $patterns = array($pagetype);
1567 $bits = explode('-', $pagetype);
1568 if (count($bits) == 3 && $bits[0] == 'mod') {
1569 if ($bits[2] == 'view') {
1570 $patterns[] = 'mod-*-view';
1571 } else if ($bits[2] == 'index') {
1572 $patterns[] = 'mod-*-index';
1575 while (count($bits) > 0) {
1576 $patterns[] = implode('-', $bits) . '-*';
1584 * Given a specific page type, parent context and currect context, return all the page type patterns
1585 * that might be used by this block.
1587 * @param string $pagetype for example 'course-view-weeks' or 'mod-quiz-view'.
1588 * @param stdClass $parentcontext Block's parent context
1589 * @param stdClass $currentcontext Current context of block
1590 * @return array an array of all the page type patterns that might match this page type.
1592 function generate_page_type_patterns($pagetype, $parentcontext = null, $currentcontext = null) {
1595 $bits = explode('-', $pagetype);
1597 $core = get_core_subsystems();
1598 $plugins = get_plugin_types();
1600 //progressively strip pieces off the page type looking for a match
1601 $componentarray = null;
1602 for ($i = count($bits); $i > 0; $i--) {
1603 $possiblecomponentarray = array_slice($bits, 0, $i);
1604 $possiblecomponent = implode('', $possiblecomponentarray);
1606 // Check to see if the component is a core component
1607 if (array_key_exists($possiblecomponent, $core) && !empty($core[$possiblecomponent])) {
1608 $libfile = $CFG->dirroot.'/'.$core[$possiblecomponent].'/lib.php';
1609 if (file_exists($libfile)) {
1610 require_once($libfile);
1611 $function = $possiblecomponent.'_page_type_list';
1612 if (function_exists($function)) {
1613 if ($patterns = $function($pagetype, $parentcontext, $currentcontext)) {
1620 //check the plugin directory and look for a callback
1621 if (array_key_exists($possiblecomponent, $plugins) && !empty($plugins[$possiblecomponent])) {
1623 //We've found a plugin type. Look for a plugin name by getting the next section of page type
1624 if (count($bits) > $i) {
1625 $pluginname = $bits[$i];
1626 $directory = get_plugin_directory($possiblecomponent, $pluginname);
1627 if (!empty($directory)){
1628 $libfile = $directory.'/lib.php';
1629 if (file_exists($libfile)) {
1630 require_once($libfile);
1631 $function = $possiblecomponent.'_'.$pluginname.'_page_type_list';
1632 if (!function_exists($function)) {
1633 $function = $pluginname.'_page_type_list';
1635 if (function_exists($function)) {
1636 if ($patterns = $function($pagetype, $parentcontext, $currentcontext)) {
1644 //we'll only get to here if we still don't have any patterns
1645 //the plugin type may have a callback
1646 $directory = get_plugin_directory($possiblecomponent, null);
1647 if (!empty($directory)){
1648 $libfile = $directory.'/lib.php';
1649 if (file_exists($libfile)) {
1650 require_once($libfile);
1651 $function = $possiblecomponent.'_page_type_list';
1652 if (function_exists($function)) {
1653 if ($patterns = $function($pagetype, $parentcontext, $currentcontext)) {
1662 if (empty($patterns)) {
1663 $patterns = default_page_type_list($pagetype, $parentcontext, $currentcontext);
1670 * Generates a default page type list when a more appropriate callback cannot be decided upon.
1672 * @param string $pagetype
1673 * @param stdClass $parentcontext
1674 * @param stdClass $currentcontext
1677 function default_page_type_list($pagetype, $parentcontext = null, $currentcontext = null) {
1678 // Generate page type patterns based on current page type if
1679 // callbacks haven't been defined
1680 $patterns = array($pagetype => $pagetype);
1681 $bits = explode('-', $pagetype);
1682 while (count($bits) > 0) {
1683 $pattern = implode('-', $bits) . '-*';
1684 $pagetypestringname = 'page-'.str_replace('*', 'x', $pattern);
1685 // guessing page type description
1686 if (get_string_manager()->string_exists($pagetypestringname, 'pagetype')) {
1687 $patterns[$pattern] = get_string($pagetypestringname, 'pagetype');
1689 $patterns[$pattern] = $pattern;
1693 $patterns['*'] = get_string('page-x', 'pagetype');
1698 * Generates the page type list for the my moodle page
1700 * @param string $pagetype
1701 * @param stdClass $parentcontext
1702 * @param stdClass $currentcontext
1705 function my_page_type_list($pagetype, $parentcontext = null, $currentcontext = null) {
1706 return array('my-index' => 'my-index');
1710 * Generates the page type list for a module by either locating and using the modules callback
1711 * or by generating a default list.
1713 * @param string $pagetype
1714 * @param stdClass $parentcontext
1715 * @param stdClass $currentcontext
1718 function mod_page_type_list($pagetype, $parentcontext = null, $currentcontext = null) {
1719 $patterns = plugin_page_type_list($pagetype, $parentcontext, $currentcontext);
1720 if (empty($patterns)) {
1721 // if modules don't have callbacks
1722 // generate two default page type patterns for modules only
1723 $bits = explode('-', $pagetype);
1724 $patterns = array($pagetype => $pagetype);
1725 if ($bits[2] == 'view') {
1726 $patterns['mod-*-view'] = get_string('page-mod-x-view', 'pagetype');
1727 } else if ($bits[2] == 'index') {
1728 $patterns['mod-*-index'] = get_string('page-mod-x-index', 'pagetype');
1733 /// Functions update the blocks if required by the request parameters ==========
1736 * Return a {@link block_contents} representing the add a new block UI, if
1737 * this user is allowed to see it.
1739 * @return block_contents an appropriate block_contents, or null if the user
1740 * cannot add any blocks here.
1742 function block_add_block_ui($page, $output) {
1743 global $CFG, $OUTPUT;
1744 if (!$page->user_is_editing() || !$page->user_can_edit_blocks()) {
1748 $bc = new block_contents();
1749 $bc->title = get_string('addblock');
1750 $bc->add_class('block_adminblock');
1752 $missingblocks = $page->blocks->get_addable_blocks();
1753 if (empty($missingblocks)) {
1754 $bc->content = get_string('noblockstoaddhere');
1759 foreach ($missingblocks as $block) {
1760 $blockobject = block_instance($block->name);
1761 if ($blockobject !== false && $blockobject->user_can_addto($page)) {
1762 $menu[$block->name] = $blockobject->get_title();
1765 collatorlib::asort($menu);
1767 $actionurl = new moodle_url($page->url, array('sesskey'=>sesskey()));
1768 $select = new single_select($actionurl, 'bui_addblock', $menu, null, array(''=>get_string('adddots')), 'add_block');
1769 $bc->content = $OUTPUT->render($select);
1773 // Functions that have been deprecated by block_manager =======================
1776 * @deprecated since Moodle 2.0 - use $page->blocks->get_addable_blocks();
1778 * This function returns an array with the IDs of any blocks that you can add to your page.
1779 * Parameters are passed by reference for speed; they are not modified at all.
1781 * @param $page the page object.
1782 * @param $blockmanager Not used.
1783 * @return array of block type ids.
1785 function blocks_get_missing(&$page, &$blockmanager) {
1786 debugging('blocks_get_missing is deprecated. Please use $page->blocks->get_addable_blocks() instead.', DEBUG_DEVELOPER);
1787 $blocks = $page->blocks->get_addable_blocks();
1789 foreach ($blocks as $block) {
1790 $ids[] = $block->id;
1796 * Actually delete from the database any blocks that are currently on this page,
1797 * but which should not be there according to blocks_name_allowed_in_format.
1799 * @todo Write/Fix this function. Currently returns immediately
1802 function blocks_remove_inappropriate($course) {
1806 $blockmanager = blocks_get_by_page($page);
1808 if (empty($blockmanager)) {
1812 if (($pageformat = $page->pagetype) == NULL) {
1816 foreach($blockmanager as $region) {
1817 foreach($region as $instance) {
1818 $block = blocks_get_record($instance->blockid);
1819 if(!blocks_name_allowed_in_format($block->name, $pageformat)) {
1820 blocks_delete_instance($instance->instance);
1827 * Check that a given name is in a permittable format
1829 * @param string $name
1830 * @param string $pageformat
1833 function blocks_name_allowed_in_format($name, $pageformat) {
1836 $formats = block_method_result($name, 'applicable_formats');
1840 foreach ($formats as $format => $allowed) {
1841 $formatregex = '/^'.str_replace('*', '[^-]*', $format).'.*$/';
1842 $depth = substr_count($format, '-');
1843 if (preg_match($formatregex, $pageformat) && $depth > $maxdepth) {
1848 if ($accept === NULL) {
1849 $accept = !empty($formats['all']);
1855 * Delete a block, and associated data.
1857 * @param object $instance a row from the block_instances table
1858 * @param bool $nolongerused legacy parameter. Not used, but kept for backwards compatibility.
1859 * @param bool $skipblockstables for internal use only. Makes @see blocks_delete_all_for_context() more efficient.
1861 function blocks_delete_instance($instance, $nolongerused = false, $skipblockstables = false) {
1864 if ($block = block_instance($instance->blockname, $instance)) {
1865 $block->instance_delete();
1867 delete_context(CONTEXT_BLOCK, $instance->id);
1869 if (!$skipblockstables) {
1870 $DB->delete_records('block_positions', array('blockinstanceid' => $instance->id));
1871 $DB->delete_records('block_instances', array('id' => $instance->id));
1872 $DB->delete_records_list('user_preferences', 'name', array('block'.$instance->id.'hidden','docked_block_instance_'.$instance->id));
1877 * Delete all the blocks that belong to a particular context.
1879 * @param int $contextid the context id.
1881 function blocks_delete_all_for_context($contextid) {
1883 $instances = $DB->get_recordset('block_instances', array('parentcontextid' => $contextid));
1884 foreach ($instances as $instance) {
1885 blocks_delete_instance($instance, true);
1887 $instances->close();
1888 $DB->delete_records('block_instances', array('parentcontextid' => $contextid));
1889 $DB->delete_records('block_positions', array('contextid' => $contextid));
1893 * Set a block to be visible or hidden on a particular page.
1895 * @param object $instance a row from the block_instances, preferably LEFT JOINed with the
1896 * block_positions table as return by block_manager.
1897 * @param moodle_page $page the back to set the visibility with respect to.
1898 * @param integer $newvisibility 1 for visible, 0 for hidden.
1900 function blocks_set_visibility($instance, $page, $newvisibility) {
1902 if (!empty($instance->blockpositionid)) {
1903 // Already have local information on this page.
1904 $DB->set_field('block_positions', 'visible', $newvisibility, array('id' => $instance->blockpositionid));
1908 // Create a new block_positions record.
1910 $bp->blockinstanceid = $instance->id;
1911 $bp->contextid = $page->context->id;
1912 $bp->pagetype = $page->pagetype;
1913 if ($page->subpage) {
1914 $bp->subpage = $page->subpage;
1916 $bp->visible = $newvisibility;
1917 $bp->region = $instance->defaultregion;
1918 $bp->weight = $instance->defaultweight;
1919 $DB->insert_record('block_positions', $bp);
1923 * @deprecated since 2.0
1924 * Delete all the blocks from a particular page.
1926 * @param string $pagetype the page type.
1927 * @param integer $pageid the page id.
1928 * @return bool success or failure.
1930 function blocks_delete_all_on_page($pagetype, $pageid) {
1933 debugging('Call to deprecated function blocks_delete_all_on_page. ' .
1934 'This function cannot work any more. Doing nothing. ' .
1935 'Please update your code to use a block_manager method $PAGE->blocks->....', DEBUG_DEVELOPER);
1940 * Dispite what this function is called, it seems to be mostly used to populate
1941 * the default blocks when a new course (or whatever) is created.
1943 * @deprecated since 2.0
1945 * @param object $page the page to add default blocks to.
1946 * @return boolean success or failure.
1948 function blocks_repopulate_page($page) {
1951 debugging('Call to deprecated function blocks_repopulate_page. ' .
1952 'Use a more specific method like blocks_add_default_course_blocks, ' .
1953 'or just call $PAGE->blocks->add_blocks()', DEBUG_DEVELOPER);
1955 /// If the site override has been defined, it is the only valid one.
1956 if (!empty($CFG->defaultblocks_override)) {
1957 $blocknames = $CFG->defaultblocks_override;
1959 $blocknames = $page->blocks_get_default();
1962 $blocks = blocks_parse_default_blocks_list($blocknames);
1963 $page->blocks->add_blocks($blocks);
1969 * Get the block record for a particular blockid - that is, a particular type os block.
1971 * @param $int blockid block type id. If null, an array of all block types is returned.
1972 * @param bool $notusedanymore No longer used.
1973 * @return array|object row from block table, or all rows.
1975 function blocks_get_record($blockid = NULL, $notusedanymore = false) {
1977 $blocks = $PAGE->blocks->get_installed_blocks();
1978 if ($blockid === NULL) {
1980 } else if (isset($blocks[$blockid])) {
1981 return $blocks[$blockid];
1988 * Find a given block by its blockid within a provide array
1990 * @param int $blockid
1991 * @param array $blocksarray
1992 * @return bool|object Instance if found else false
1994 function blocks_find_block($blockid, $blocksarray) {
1995 if (empty($blocksarray)) {
1998 foreach($blocksarray as $blockgroup) {
1999 if (empty($blockgroup)) {
2002 foreach($blockgroup as $instance) {
2003 if($instance->blockid == $blockid) {
2011 // Functions for programatically adding default blocks to pages ================
2014 * Parse a list of default blocks. See config-dist for a description of the format.
2016 * @param string $blocksstr
2019 function blocks_parse_default_blocks_list($blocksstr) {
2021 $bits = explode(':', $blocksstr);
2022 if (!empty($bits)) {
2023 $leftbits = trim(array_shift($bits));
2024 if ($leftbits != '') {
2025 $blocks[BLOCK_POS_LEFT] = explode(',', $leftbits);
2028 if (!empty($bits)) {
2029 $rightbits =trim(array_shift($bits));
2030 if ($rightbits != '') {
2031 $blocks[BLOCK_POS_RIGHT] = explode(',', $rightbits);
2038 * @return array the blocks that should be added to the site course by default.
2040 function blocks_get_default_site_course_blocks() {
2043 if (!empty($CFG->defaultblocks_site)) {
2044 return blocks_parse_default_blocks_list($CFG->defaultblocks_site);
2047 BLOCK_POS_LEFT => array('site_main_menu'),
2048 BLOCK_POS_RIGHT => array('course_summary', 'calendar_month')
2054 * Add the default blocks to a course.
2056 * @param object $course a course object.
2058 function blocks_add_default_course_blocks($course) {
2061 if (!empty($CFG->defaultblocks_override)) {
2062 $blocknames = blocks_parse_default_blocks_list($CFG->defaultblocks_override);
2064 } else if ($course->id == SITEID) {
2065 $blocknames = blocks_get_default_site_course_blocks();
2068 $defaultblocks = 'defaultblocks_' . $course->format;
2069 if (!empty($CFG->$defaultblocks)) {
2070 $blocknames = blocks_parse_default_blocks_list($CFG->$defaultblocks);
2073 $formatconfig = $CFG->dirroot.'/course/format/'.$course->format.'/config.php';
2074 $format = array(); // initialize array in external file
2075 if (is_readable($formatconfig)) {
2076 include($formatconfig);
2078 if (!empty($format['defaultblocks'])) {
2079 $blocknames = blocks_parse_default_blocks_list($format['defaultblocks']);
2081 } else if (!empty($CFG->defaultblocks)){
2082 $blocknames = blocks_parse_default_blocks_list($CFG->defaultblocks);
2085 $blocknames = array(
2086 BLOCK_POS_LEFT => array(),
2087 BLOCK_POS_RIGHT => array('search_forums', 'news_items', 'calendar_upcoming', 'recent_activity')
2093 if ($course->id == SITEID) {
2094 $pagetypepattern = 'site-index';
2096 $pagetypepattern = 'course-view-*';
2098 $page = new moodle_page();
2099 $page->set_course($course);
2100 $page->blocks->add_blocks($blocknames, $pagetypepattern);
2104 * Add the default system-context blocks. E.g. the admin tree.
2106 function blocks_add_default_system_blocks() {
2109 $page = new moodle_page();
2110 $page->set_context(get_context_instance(CONTEXT_SYSTEM));
2111 $page->blocks->add_blocks(array(BLOCK_POS_LEFT => array('navigation', 'settings')), '*', null, true);
2112 $page->blocks->add_blocks(array(BLOCK_POS_LEFT => array('admin_bookmarks')), 'admin-*', null, null, 2);
2114 if ($defaultmypage = $DB->get_record('my_pages', array('userid'=>null, 'name'=>'__default', 'private'=>1))) {
2115 $subpagepattern = $defaultmypage->id;
2117 $subpagepattern = null;
2120 $page->blocks->add_blocks(array(BLOCK_POS_RIGHT => array('private_files', 'online_users'), 'content' => array('course_overview')), 'my-index', $subpagepattern, false);