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blocklib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Block Class and Functions
*
* This file defines the {@link block_manager} class,
*
* @package core
* @subpackage block
* @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**#@+
* Default names for the block regions in the standard theme.
*/
define('BLOCK_POS_LEFT', 'side-pre');
define('BLOCK_POS_RIGHT', 'side-post');
/**#@-*/
define('BUI_CONTEXTS_FRONTPAGE_ONLY', 0);
define('BUI_CONTEXTS_FRONTPAGE_SUBS', 1);
define('BUI_CONTEXTS_ENTIRE_SITE', 2);
define('BUI_CONTEXTS_CURRENT', 0);
define('BUI_CONTEXTS_CURRENT_SUBS', 1);
// Position of "Add block" control, to be used in theme config as a value for $THEME->addblockposition:
// - default: as a fake block that is displayed in editing mode
// - flatnav: "Add block" item in the flat navigation drawer in editing mode
// - custom: none of the above, theme will take care of displaying the control.
define('BLOCK_ADDBLOCK_POSITION_DEFAULT', 0);
define('BLOCK_ADDBLOCK_POSITION_FLATNAV', 1);
define('BLOCK_ADDBLOCK_POSITION_CUSTOM', -1);
/**
* Exception thrown when someone tried to do something with a block that does
* not exist on a page.
*
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
*/
class block_not_on_page_exception extends moodle_exception {
/**
* Constructor
* @param int $instanceid the block instance id of the block that was looked for.
* @param object $page the current page.
*/
public function __construct($instanceid, $page) {
$a = new stdClass;
$a->instanceid = $instanceid;
$a->url = $page->url->out();
parent::__construct('blockdoesnotexistonpage', '', $page->url->out(), $a);
}
}
/**
* This class keeps track of the block that should appear on a moodle_page.
*
* The page to work with as passed to the constructor.
*
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
*/
class block_manager {
/**
* The UI normally only shows block weights between -MAX_WEIGHT and MAX_WEIGHT,
* although other weights are valid.
*/
const MAX_WEIGHT = 10;
/// Field declarations =========================================================
/**
* the moodle_page we are managing blocks for.
* @var moodle_page
*/
protected $page;
/** @var array region name => 1.*/
protected $regions = array();
/** @var string the region where new blocks are added.*/
protected $defaultregion = null;
/** @var array will be $DB->get_records('blocks') */
protected $allblocks = null;
/**
* @var array blocks that this user can add to this page. Will be a subset
* of $allblocks, but with array keys block->name. Access this via the
* {@link get_addable_blocks()} method to ensure it is lazy-loaded.
*/
protected $addableblocks = null;
/**
* Will be an array region-name => array(db rows loaded in load_blocks);
* @var array
*/
protected $birecordsbyregion = null;
/**
* array region-name => array(block objects); populated as necessary by
* the ensure_instances_exist method.
* @var array
*/
protected $blockinstances = array();
/**
* array region-name => array(block_contents objects) what actually needs to
* be displayed in each region.
* @var array
*/
protected $visibleblockcontent = array();
/**
* array region-name => array(block_contents objects) extra block-like things
* to be displayed in each region, before the real blocks.
* @var array
*/
protected $extracontent = array();
/**
* Used by the block move id, to track whether a block is currently being moved.
*
* When you click on the move icon of a block, first the page needs to reload with
* extra UI for choosing a new position for a particular block. In that situation
* this field holds the id of the block being moved.
*
* @var integer|null
*/
protected $movingblock = null;
/**
* Show only fake blocks
*/
protected $fakeblocksonly = false;
/// Constructor ================================================================
/**
* Constructor.
* @param object $page the moodle_page object object we are managing the blocks for,
* or a reasonable faxilimily. (See the comment at the top of this class
* and {@link http://en.wikipedia.org/wiki/Duck_typing})
*/
public function __construct($page) {
$this->page = $page;
}
/// Getter methods =============================================================
/**
* Get an array of all region names on this page where a block may appear
*
* @return array the internal names of the regions on this page where block may appear.
*/
public function get_regions() {
if (is_null($this->defaultregion)) {
$this->page->initialise_theme_and_output();
}
return array_keys($this->regions);
}
/**
* Get the region name of the region blocks are added to by default
*
* @return string the internal names of the region where new blocks are added
* by default, and where any blocks from an unrecognised region are shown.
* (Imagine that blocks were added with one theme selected, then you switched
* to a theme with different block positions.)
*/
public function get_default_region() {
$this->page->initialise_theme_and_output();
return $this->defaultregion;
}
/**
* The list of block types that may be added to this page.
*
* @return array block name => record from block table.
*/
public function get_addable_blocks() {
$this->check_is_loaded();
if (!is_null($this->addableblocks)) {
return $this->addableblocks;
}
// Lazy load.
$this->addableblocks = array();
$allblocks = blocks_get_record();
if (empty($allblocks)) {
return $this->addableblocks;
}
$unaddableblocks = self::get_undeletable_block_types();
$requiredbythemeblocks = $this->get_required_by_theme_block_types();
$pageformat = $this->page->pagetype;
foreach($allblocks as $block) {
if (!$bi = block_instance($block->name)) {
continue;
}
if ($block->visible && !in_array($block->name, $unaddableblocks) &&
!in_array($block->name, $requiredbythemeblocks) &&
($bi->instance_allow_multiple() || !$this->is_block_present($block->name)) &&
blocks_name_allowed_in_format($block->name, $pageformat) &&
$bi->user_can_addto($this->page)) {
$block->title = $bi->get_title();
$this->addableblocks[$block->name] = $block;
}
}
core_collator::asort_objects_by_property($this->addableblocks, 'title');
return $this->addableblocks;
}
/**
* Given a block name, find out of any of them are currently present in the page
* @param string $blockname - the basic name of a block (eg "navigation")
* @return boolean - is there one of these blocks in the current page?
*/
public function is_block_present($blockname) {
if (empty($this->blockinstances)) {
return false;
}
$requiredbythemeblocks = $this->get_required_by_theme_block_types();
foreach ($this->blockinstances as $region) {
foreach ($region as $instance) {
if (empty($instance->instance->blockname)) {
continue;
}
if ($instance->instance->blockname == $blockname) {
if ($instance->instance->requiredbytheme) {
if (!in_array($blockname, $requiredbythemeblocks)) {
continue;
}
}
return true;
}
}
}
return false;
}
/**
* Find out if a block type is known by the system
*
* @param string $blockname the name of the type of block.
* @param boolean $includeinvisible if false (default) only check 'visible' blocks, that is, blocks enabled by the admin.
* @return boolean true if this block in installed.
*/
public function is_known_block_type($blockname, $includeinvisible = false) {
$blocks = $this->get_installed_blocks();
foreach ($blocks as $block) {
if ($block->name == $blockname && ($includeinvisible || $block->visible)) {
return true;
}
}
return false;
}
/**
* Find out if a region exists on a page
*
* @param string $region a region name
* @return boolean true if this region exists on this page.
*/
public function is_known_region($region) {
if (empty($region)) {
return false;
}
return array_key_exists($region, $this->regions);
}
/**
* Get an array of all blocks within a given region
*
* @param string $region a block region that exists on this page.
* @return array of block instances.
*/
public function get_blocks_for_region($region) {
$this->check_is_loaded();
$this->ensure_instances_exist($region);
return $this->blockinstances[$region];
}
/**
* Returns an array of block content objects that exist in a region
*
* @param string $region a block region that exists on this page.
* @return array of block block_contents objects for all the blocks in a region.
*/
public function get_content_for_region($region, $output) {
$this->check_is_loaded();
$this->ensure_content_created($region, $output);
return $this->visibleblockcontent[$region];
}
/**
* Returns an array of block content objects for all the existings regions
*
* @param renderer_base $output the rendered to use
* @return array of block block_contents objects for all the blocks in all regions.
* @since Moodle 3.3
*/
public function get_content_for_all_regions($output) {
$contents = array();
$this->check_is_loaded();
foreach ($this->regions as $region => $val) {
$this->ensure_content_created($region, $output);
$contents[$region] = $this->visibleblockcontent[$region];
}
return $contents;
}
/**
* Helper method used by get_content_for_region.
* @param string $region region name
* @param float $weight weight. May be fractional, since you may want to move a block
* between ones with weight 2 and 3, say ($weight would be 2.5).
* @return string URL for moving block $this->movingblock to this position.
*/
protected function get_move_target_url($region, $weight) {
return new moodle_url($this->page->url, array('bui_moveid' => $this->movingblock,
'bui_newregion' => $region, 'bui_newweight' => $weight, 'sesskey' => sesskey()));
}
/**
* Determine whether a region contains anything. (Either any real blocks, or
* the add new block UI.)
*
* (You may wonder why the $output parameter is required. Unfortunately,
* because of the way that blocks work, the only reliable way to find out
* if a block will be visible is to get the content for output, and to
* get the content, you need a renderer. Fortunately, this is not a
* performance problem, because we cache the output that is generated, and
* in almost every case where we call region_has_content, we are about to
* output the blocks anyway, so we are not doing wasted effort.)
*
* @param string $region a block region that exists on this page.
* @param core_renderer $output a core_renderer. normally the global $OUTPUT.
* @return boolean Whether there is anything in this region.
*/
public function region_has_content($region, $output) {
if (!$this->is_known_region($region)) {
return false;
}
$this->check_is_loaded();
$this->ensure_content_created($region, $output);
// if ($this->page->user_is_editing() && $this->page->user_can_edit_blocks()) {
// Mark Nielsen's patch - part 1
if ($this->page->user_is_editing() && $this->page->user_can_edit_blocks() && $this->movingblock) {
// If editing is on, we need all the block regions visible, for the
// move blocks UI.
return true;
}
return !empty($this->visibleblockcontent[$region]) || !empty($this->extracontent[$region]);
}
/**
* Get an array of all of the installed blocks.
*
* @return array contents of the block table.
*/
public function get_installed_blocks() {
global $DB;
if (is_null($this->allblocks)) {
$this->allblocks = $DB->get_records('block');
}
return $this->allblocks;
}
/**
* @return array names of block types that must exist on every page with this theme.
*/
public function get_required_by_theme_block_types() {
$requiredbythemeblocks = false;
if (isset($this->page->theme->requiredblocks)) {
$requiredbythemeblocks = $this->page->theme->requiredblocks;
}
if ($requiredbythemeblocks === false) {
return array('navigation', 'settings');
} else if ($requiredbythemeblocks === '') {
return array();
} else if (is_string($requiredbythemeblocks)) {
return explode(',', $requiredbythemeblocks);
} else {
return $requiredbythemeblocks;
}
}
/**
* Make this block type undeletable and unaddable.
*
* @param mixed $blockidorname string or int
*/
public static function protect_block($blockidorname) {
global $DB;
$syscontext = context_system::instance();
require_capability('moodle/site:config', $syscontext);
$block = false;
if (is_int($blockidorname)) {
$block = $DB->get_record('block', array('id' => $blockidorname), 'id, name', MUST_EXIST);
} else {
$block = $DB->get_record('block', array('name' => $blockidorname), 'id, name', MUST_EXIST);
}
$undeletableblocktypes = self::get_undeletable_block_types();
if (!in_array($block->name, $undeletableblocktypes)) {
$undeletableblocktypes[] = $block->name;
set_config('undeletableblocktypes', implode(',', $undeletableblocktypes));
add_to_config_log('block_protect', "0", "1", $block->name);
}
}
/**
* Make this block type deletable and addable.
*
* @param mixed $blockidorname string or int
*/
public static function unprotect_block($blockidorname) {
global $DB;
$syscontext = context_system::instance();
require_capability('moodle/site:config', $syscontext);
$block = false;
if (is_int($blockidorname)) {
$block = $DB->get_record('block', array('id' => $blockidorname), 'id, name', MUST_EXIST);
} else {
$block = $DB->get_record('block', array('name' => $blockidorname), 'id, name', MUST_EXIST);
}
$undeletableblocktypes = self::get_undeletable_block_types();
if (in_array($block->name, $undeletableblocktypes)) {
$undeletableblocktypes = array_diff($undeletableblocktypes, array($block->name));
set_config('undeletableblocktypes', implode(',', $undeletableblocktypes));
add_to_config_log('block_protect', "1", "0", $block->name);
}
}
/**
* Get the list of "protected" blocks via admin block manager ui.
*
* @return array names of block types that cannot be added or deleted. E.g. array('navigation','settings').
*/
public static function get_undeletable_block_types() {
global $CFG;
$undeletableblocks = false;
if (isset($CFG->undeletableblocktypes)) {
$undeletableblocks = $CFG->undeletableblocktypes;
}
if (empty($undeletableblocks)) {
return array();
} else if (is_string($undeletableblocks)) {
return explode(',', $undeletableblocks);
} else {
return $undeletableblocks;
}
}
/// Setter methods =============================================================
/**
* Add a region to a page
*
* @param string $region add a named region where blocks may appear on the current page.
* This is an internal name, like 'side-pre', not a string to display in the UI.
* @param bool $custom True if this is a custom block region, being added by the page rather than the theme layout.
*/
public function add_region($region, $custom = true) {
global $SESSION;
$this->check_not_yet_loaded();
if ($custom) {
if (array_key_exists($region, $this->regions)) {
// This here is EXACTLY why we should not be adding block regions into a page. It should
// ALWAYS be done in a theme layout.
debugging('A custom region conflicts with a block region in the theme.', DEBUG_DEVELOPER);
}
// We need to register this custom region against the page type being used.
// This allows us to check, when performing block actions, that unrecognised regions can be worked with.
$type = $this->page->pagetype;
if (!isset($SESSION->custom_block_regions)) {
$SESSION->custom_block_regions = array($type => array($region));
} else if (!isset($SESSION->custom_block_regions[$type])) {
$SESSION->custom_block_regions[$type] = array($region);
} else if (!in_array($region, $SESSION->custom_block_regions[$type])) {
$SESSION->custom_block_regions[$type][] = $region;
}
}
$this->regions[$region] = 1;
}
/**
* Add an array of regions
* @see add_region()
*
* @param array $regions this utility method calls add_region for each array element.
*/
public function add_regions($regions, $custom = true) {
foreach ($regions as $region) {
$this->add_region($region, $custom);
}
}
/**
* Finds custom block regions associated with a page type and registers them with this block manager.
*
* @param string $pagetype
*/
public function add_custom_regions_for_pagetype($pagetype) {
global $SESSION;
if (isset($SESSION->custom_block_regions[$pagetype])) {
foreach ($SESSION->custom_block_regions[$pagetype] as $customregion) {
$this->add_region($customregion, false);
}
}
}
/**
* Set the default region for new blocks on the page
*
* @param string $defaultregion the internal names of the region where new
* blocks should be added by default, and where any blocks from an
* unrecognised region are shown.
*/
public function set_default_region($defaultregion) {
$this->check_not_yet_loaded();
if ($defaultregion) {
$this->check_region_is_known($defaultregion);
}
$this->defaultregion = $defaultregion;
}
/**
* Add something that looks like a block, but which isn't an actual block_instance,
* to this page.
*
* @param block_contents $bc the content of the block-like thing.
* @param string $region a block region that exists on this page.
*/
public function add_fake_block($bc, $region) {
$this->page->initialise_theme_and_output();
if (!$this->is_known_region($region)) {
$region = $this->get_default_region();
}
if (array_key_exists($region, $this->visibleblockcontent)) {
throw new coding_exception('block_manager has already prepared the blocks in region ' .
$region . 'for output. It is too late to add a fake block.');
}
if (!isset($bc->attributes['data-block'])) {
$bc->attributes['data-block'] = '_fake';
}
$bc->attributes['class'] .= ' block_fake';
$this->extracontent[$region][] = $bc;
}
/**
* Checks to see whether all of the blocks within the given region are docked
*
* @see region_uses_dock
* @param string $region
* @return bool True if all of the blocks within that region are docked
*/
public function region_completely_docked($region, $output) {
global $CFG;
// If theme doesn't allow docking or allowblockstodock is not set, then return.
if (!$this->page->theme->enable_dock || empty($CFG->allowblockstodock)) {
return false;
}
// Do not dock the region when the user attemps to move a block.
if ($this->movingblock) {
return false;
}
// Block regions should not be docked during editing when all the blocks are hidden.
if ($this->page->user_is_editing() && $this->page->user_can_edit_blocks()) {
return false;
}
$this->check_is_loaded();
$this->ensure_content_created($region, $output);
if (!$this->region_has_content($region, $output)) {
// If the region has no content then nothing is docked at all of course.
return false;
}
foreach ($this->visibleblockcontent[$region] as $instance) {
if (!get_user_preferences('docked_block_instance_'.$instance->blockinstanceid, 0)) {
return false;
}
}
return true;
}
/**
* Checks to see whether any of the blocks within the given regions are docked
*
* @see region_completely_docked
* @param array|string $regions array of regions (or single region)
* @return bool True if any of the blocks within that region are docked
*/
public function region_uses_dock($regions, $output) {
if (!$this->page->theme->enable_dock) {
return false;
}
$this->check_is_loaded();
foreach((array)$regions as $region) {
$this->ensure_content_created($region, $output);
foreach($this->visibleblockcontent[$region] as $instance) {
if(!empty($instance->content) && get_user_preferences('docked_block_instance_'.$instance->blockinstanceid, 0)) {
return true;
}
}
}
return false;
}
/// Actions ====================================================================
/**
* This method actually loads the blocks for our page from the database.
*
* @param boolean|null $includeinvisible
* null (default) - load hidden blocks if $this->page->user_is_editing();
* true - load hidden blocks.
* false - don't load hidden blocks.
*/
public function load_blocks($includeinvisible = null) {
global $DB, $CFG;
if (!is_null($this->birecordsbyregion)) {
// Already done.
return;
}
if ($CFG->version < 2009050619) {
// Upgrade/install not complete. Don't try too show any blocks.
$this->birecordsbyregion = array();
return;
}
// Ensure we have been initialised.
if (is_null($this->defaultregion)) {
$this->page->initialise_theme_and_output();
// If there are still no block regions, then there are no blocks on this page.
if (empty($this->regions)) {
$this->birecordsbyregion = array();
return;
}
}
// Check if we need to load normal blocks
if ($this->fakeblocksonly) {
$this->birecordsbyregion = $this->prepare_per_region_arrays();
return;
}
// Exclude auto created blocks if they are not undeletable in this theme.
$requiredbytheme = $this->get_required_by_theme_block_types();
$requiredbythemecheck = '';
$requiredbythemeparams = array();
$requiredbythemenotparams = array();
if (!empty($requiredbytheme)) {
list($testsql, $requiredbythemeparams) = $DB->get_in_or_equal($requiredbytheme, SQL_PARAMS_NAMED, 'requiredbytheme');
list($testnotsql, $requiredbythemenotparams) = $DB->get_in_or_equal($requiredbytheme, SQL_PARAMS_NAMED,
'notrequiredbytheme', false);
$requiredbythemecheck = 'AND ((bi.blockname ' . $testsql . ' AND bi.requiredbytheme = 1) OR ' .
' (bi.blockname ' . $testnotsql . ' AND bi.requiredbytheme = 0))';
} else {
$requiredbythemecheck = 'AND (bi.requiredbytheme = 0)';
}
if (is_null($includeinvisible)) {
$includeinvisible = $this->page->user_is_editing();
}
if ($includeinvisible) {
$visiblecheck = '';
} else {
$visiblecheck = 'AND (bp.visible = 1 OR bp.visible IS NULL) AND (bs.visible = 1 OR bs.visible IS NULL)';
}
$context = $this->page->context;
$contexttest = 'bi.parentcontextid IN (:contextid2, :contextid3)';
$parentcontextparams = array();
$parentcontextids = $context->get_parent_context_ids();
if ($parentcontextids) {
list($parentcontexttest, $parentcontextparams) =
$DB->get_in_or_equal($parentcontextids, SQL_PARAMS_NAMED, 'parentcontext');
$contexttest = "($contexttest OR (bi.showinsubcontexts = 1 AND bi.parentcontextid $parentcontexttest))";
}
$pagetypepatterns = matching_page_type_patterns($this->page->pagetype);
list($pagetypepatterntest, $pagetypepatternparams) =
$DB->get_in_or_equal($pagetypepatterns, SQL_PARAMS_NAMED, 'pagetypepatterntest');
$ccselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
$ccjoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = bi.id AND ctx.contextlevel = :contextlevel)";
$systemcontext = context_system::instance();
$params = array(
'contextlevel' => CONTEXT_BLOCK,
'subpage1' => $this->page->subpage,
'subpage2' => $this->page->subpage,
'subpage3' => $this->page->subpage,
'contextid1' => $context->id,
'contextid2' => $context->id,
'contextid3' => $systemcontext->id,
'contextid4' => $systemcontext->id,
'pagetype' => $this->page->pagetype,
'pagetype2' => $this->page->pagetype,
);
if ($this->page->subpage === '') {
$params['subpage1'] = '';
$params['subpage2'] = '';
$params['subpage3'] = '';
}
$sql = "SELECT
bi.id,
COALESCE(bp.id, bs.id) AS blockpositionid,
bi.blockname,
bi.parentcontextid,
bi.showinsubcontexts,
bi.pagetypepattern,
bi.requiredbytheme,
bi.subpagepattern,
bi.defaultregion,
bi.defaultweight,
COALESCE(bp.visible, bs.visible, 1) AS visible,
COALESCE(bp.region, bs.region, bi.defaultregion) AS region,
COALESCE(bp.weight, bs.weight, bi.defaultweight) AS weight,
bi.configdata
$ccselect
FROM {block_instances} bi
JOIN {block} b ON bi.blockname = b.name
LEFT JOIN {block_positions} bp ON bp.blockinstanceid = bi.id
AND bp.contextid = :contextid1
AND bp.pagetype = :pagetype
AND bp.subpage = :subpage1
LEFT JOIN {block_positions} bs ON bs.blockinstanceid = bi.id
AND bs.contextid = :contextid4
AND bs.pagetype = :pagetype2
AND bs.subpage = :subpage3
$ccjoin
WHERE
$contexttest
AND bi.pagetypepattern $pagetypepatterntest
AND (bi.subpagepattern IS NULL OR bi.subpagepattern = :subpage2)
$visiblecheck
AND b.visible = 1
$requiredbythemecheck
ORDER BY
COALESCE(bp.region, bs.region, bi.defaultregion),
COALESCE(bp.weight, bs.weight, bi.defaultweight),
bi.id";
$allparams = $params + $parentcontextparams + $pagetypepatternparams + $requiredbythemeparams + $requiredbythemenotparams;
$blockinstances = $DB->get_recordset_sql($sql, $allparams);
$this->birecordsbyregion = $this->prepare_per_region_arrays();
$unknown = array();
foreach ($blockinstances as $bi) {
context_helper::preload_from_record($bi);
if ($this->is_known_region($bi->region)) {
$this->birecordsbyregion[$bi->region][] = $bi;
} else {
$unknown[] = $bi;
}
}
$blockinstances->close();
// Pages don't necessarily have a defaultregion. The one time this can
// happen is when there are no theme block regions, but the script itself
// has a block region in the main content area.
if (!empty($this->defaultregion)) {
$this->birecordsbyregion[$this->defaultregion] =
array_merge($this->birecordsbyregion[$this->defaultregion], $unknown);
}
}
/**
* Add a block to the current page, or related pages. The block is added to
* context $this->page->contextid. If $pagetypepattern $subpagepattern
*
* @param string $blockname The type of block to add.
* @param string $region the block region on this page to add the block to.
* @param integer $weight determines the order where this block appears in the region.
* @param boolean $showinsubcontexts whether this block appears in subcontexts, or just the current context.
* @param string|null $pagetypepattern which page types this block should appear on. Defaults to just the current page type.
* @param string|null $subpagepattern which subpage this block should appear on. NULL = any (the default), otherwise only the specified subpage.
*/
public function add_block($blockname, $region, $weight, $showinsubcontexts, $pagetypepattern = NULL, $subpagepattern = NULL) {
global $DB;
// Allow invisible blocks because this is used when adding default page blocks, which
// might include invisible ones if the user makes some default blocks invisible
$this->check_known_block_type($blockname, true);
$this->check_region_is_known($region);
if (empty($pagetypepattern)) {
$pagetypepattern = $this->page->pagetype;
}
$blockinstance = new stdClass;
$blockinstance->blockname = $blockname;
$blockinstance->parentcontextid = $this->page->context->id;
$blockinstance->showinsubcontexts = !empty($showinsubcontexts);
$blockinstance->pagetypepattern = $pagetypepattern;
$blockinstance->subpagepattern = $subpagepattern;
$blockinstance->defaultregion = $region;
$blockinstance->defaultweight = $weight;
$blockinstance->configdata = '';
$blockinstance->timecreated = time();
$blockinstance->timemodified = $blockinstance->timecreated;
$blockinstance->id = $DB->insert_record('block_instances', $blockinstance);
// Ensure the block context is created.
context_block::instance($blockinstance->id);
// If the new instance was created, allow it to do additional setup
if ($block = block_instance($blockname, $blockinstance)) {
$block->instance_create();
}
}
public function add_block_at_end_of_default_region($blockname) {
if (empty($this->birecordsbyregion)) {
// No blocks or block regions exist yet.
return;
}
$defaulregion = $this->get_default_region();
$lastcurrentblock = end($this->birecordsbyregion[$defaulregion]);
if ($lastcurrentblock) {
$weight = $lastcurrentblock->weight + 1;
} else {
$weight = 0;
}
if ($this->page->subpage) {
$subpage = $this->page->subpage;
} else {
$subpage = null;
}
// Special case. Course view page type include the course format, but we
// want to add the block non-format-specifically.
$pagetypepattern = $this->page->pagetype;
if (strpos($pagetypepattern, 'course-view') === 0) {
$pagetypepattern = 'course-view-*';
}
// We should end using this for ALL the blocks, making always the 1st option
// the default one to be used. Until then, this is one hack to avoid the
// 'pagetypewarning' message on blocks initial edition (MDL-27829) caused by
// non-existing $pagetypepattern set. This way at least we guarantee one "valid"
// (the FIRST $pagetypepattern will be set)
// We are applying it to all blocks created in mod pages for now and only if the
// default pagetype is not one of the available options
if (preg_match('/^mod-.*-/', $pagetypepattern)) {
$pagetypelist = generate_page_type_patterns($this->page->pagetype, null, $this->page->context);
// Only go for the first if the pagetype is not a valid option
if (is_array($pagetypelist) && !array_key_exists($pagetypepattern, $pagetypelist)) {
$pagetypepattern = key($pagetypelist);
}
}
// Surely other pages like course-report will need this too, they just are not important
// enough now. This will be decided in the coming days. (MDL-27829, MDL-28150)
$this->add_block($blockname, $defaulregion, $weight, false, $pagetypepattern, $subpage);
}
/**
* Convenience method, calls add_block repeatedly for all the blocks in $blocks. Optionally, a starting weight
* can be used to decide the starting point that blocks are added in the region, the weight is passed to {@link add_block}
* and incremented by the position of the block in the $blocks array
*
* @param array $blocks array with array keys the region names, and values an array of block names.
* @param string $pagetypepattern optional. Passed to {@link add_block()}
* @param string $subpagepattern optional. Passed to {@link add_block()}
* @param boolean $showinsubcontexts optional. Passed to {@link add_block()}
* @param integer $weight optional. Determines the starting point that the blocks are added in the region.
*/
public function add_blocks($blocks, $pagetypepattern = NULL, $subpagepattern = NULL, $showinsubcontexts=false, $weight=0) {
$initialweight = $weight;
$this->add_regions(array_keys($blocks), false);
foreach ($blocks as $region => $regionblocks) {
foreach ($regionblocks as $offset => $blockname) {
$weight = $initialweight + $offset;
$this->add_block($blockname, $region, $weight, $showinsubcontexts, $pagetypepattern, $subpagepattern);
}
}
}
/**
* Move a block to a new position on this page.
*
* If this block cannot appear on any other pages, then we change defaultposition/weight
* in the block_instances table. Otherwise we just set the position on this page.
*
* @param $blockinstanceid the block instance id.
* @param $newregion the new region name.
* @param $newweight the new weight.
*/
public function reposition_block($blockinstanceid, $newregion, $newweight) {
global $DB;
$this->check_region_is_known($newregion);
$inst = $this->find_instance($blockinstanceid);
$bi = $inst->instance;
if ($bi->weight == $bi->defaultweight && $bi->region == $bi->defaultregion &&
!$bi->showinsubcontexts && strpos($bi->pagetypepattern, '*') === false &&
(!$this->page->subpage || $bi->subpagepattern)) {
// Set default position
$newbi = new stdClass;
$newbi->id = $bi->id;
$newbi->defaultregion = $newregion;
$newbi->defaultweight = $newweight;
$newbi->timemodified = time();
$DB->update_record('block_instances', $newbi);
if ($bi->blockpositionid) {
$bp = new stdClass;
$bp->id = $bi->blockpositionid;
$bp->region = $newregion;
$bp->weight = $newweight;
$DB->update_record('block_positions', $bp);
}
} else {
// Just set position on this page.
$bp = new stdClass;
$bp->region = $newregion;
$bp->weight = $newweight;
if ($bi->blockpositionid) {
$bp->id = $bi->blockpositionid;
$DB->update_record('block_positions', $bp);
} else {
$bp->blockinstanceid = $bi->id;
$bp->contextid = $this->page->context->id;
$bp->pagetype = $this->page->pagetype;
if ($this->page->subpage) {
$bp->subpage = $this->page->subpage;
} else {
$bp->subpage = '';
}
$bp->visible = $bi->visible;
$DB->insert_record('block_positions', $bp);
}
}
}
/**
* Find a given block by its instance id
*
* @param integer $instanceid
* @return block_base
*/
public function find_instance($instanceid) {
foreach ($this->regions as $region => $notused) {
$this->ensure_instances_exist($region);
foreach($this->blockinstances[$region] as $instance) {
if ($instance->instance->id == $instanceid) {