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blocklib.php
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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 moodlecore
* @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
/**#@+
* @deprecated since Moodle 2.0. No longer used.
*/
define('BLOCK_MOVE_LEFT', 0x01);
define('BLOCK_MOVE_RIGHT', 0x02);
define('BLOCK_MOVE_UP', 0x04);
define('BLOCK_MOVE_DOWN', 0x08);
define('BLOCK_CONFIGURE', 0x10);
/**#@-*/
/**#@+
* Default names for the block regions in the standard theme.
*/
define('BLOCK_POS_LEFT', 'side-pre');
define('BLOCK_POS_RIGHT', 'side-post');
/**#@-*/
/**#@+
* @deprecated since Moodle 2.0. No longer used.
*/
define('BLOCKS_PINNED_TRUE',0);
define('BLOCKS_PINNED_FALSE',1);
define('BLOCKS_PINNED_BOTH',2);
/**#@-*/
/**
* 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 {
/**
* Contructor
* @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 =========================================================
/** @var moodle_page the moodle_page we aremanaging blocks for. */
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 acutally 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 cuurently being moved.
*
* Whe you click on the move icon of a block, first the page needs to reload with
* extra UI for chooseing 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;
/// Constructor ================================================================
/**
* Constructor.
* @param object $page the moodle_page object object we are managing the blocks for,
* or a reasonable faxilimily. (See the comment at the top of this classe
* and {@link http://en.wikipedia.org/wiki/Duck_typing})
*/
public function __construct($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;
}
$pageformat = $this->page->pagetype;
foreach($allblocks as $block) {
if ($block->visible &&
(block_method_result($block->name, 'instance_allow_multiple') || !$this->is_block_present($block->id)) &&
blocks_name_allowed_in_format($block->name, $pageformat) &&
block_method_result($block->name, 'user_can_addto', $this->page)) {
$this->addableblocks[$block->name] = $block;
}
}
return $this->addableblocks;
}
/**
* Find out if a block is present ? just a guess
* @todo Write this function and document
*/
public function is_block_present($blocktypeid) {
// TODO
}
/**
* Find out if a block type is known by the system
*
* @param string $blockname the name of ta 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 $region a region name
* @return boolean true if this retion exists on this page.
*/
public function is_known_region($region) {
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];
}
/**
* 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 $this->page->url->out(false, array('bui_moveid' => $this->movingblock,
'bui_newregion' => $region, 'bui_newweight' => $weight, 'sesskey' => sesskey()), false);
}
/**
* 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,
* becuase 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, becuase 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 object $output a moodle_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() && $this->page->user_can_edit_blocks()) {
// If editing is on, we need all the block regions visible, for the
// move blocks UI.
return true;
}
return !empty($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;
}
/// Setter methods =============================================================
/**
* Add a region to a page
*
* @param string $region add a named region where blocks may appear on the
* current page. This is an internal name, like 'side-pre', not a string to
* display in the UI.
*/
public function add_region($region) {
$this->check_not_yet_loaded();
$this->regions[$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) {
foreach ($regions as $region) {
$this->add_region($region);
}
}
/**
* 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 $region a block region that exists on this page.
*/
public function add_pretend_block($bc, $region) {
$this->page->initialise_theme_and_output();
$this->check_region_is_known($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 pretend block.');
}
$this->extracontent[$region][] = $bc;
}
/// 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)) {
$this->birecordsbyregion = array();
return;
}
}
if (is_null($includeinvisible)) {
$includeinvisible = $this->page->user_is_editing();
}
if ($includeinvisible) {
$visiblecheck = '';
} else {
$visiblecheck = 'AND (bp.visible = 1 OR bp.visible IS NULL)';
}
$context = $this->page->context;
$contexttest = 'bi.parentcontextid = :contextid2';
$parentcontextparams = array();
$parentcontextids = get_parent_contexts($context);
if ($parentcontextids) {
list($parentcontexttest, $parentcontextparams) =
$DB->get_in_or_equal($parentcontextids, SQL_PARAMS_NAMED, 'parentcontext0000');
$contexttest = "($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, 'pagetypepatterntest0000');
$params = array(
'subpage1' => $this->page->subpage,
'subpage2' => $this->page->subpage,
'contextid1' => $context->id,
'contextid2' => $context->id,
'pagetype' => $this->page->pagetype,
'contextblock' => CONTEXT_BLOCK,
);
$sql = "SELECT
bi.id,
bp.id AS blockpositionid,
bi.blockname,
bi.parentcontextid,
bi.showinsubcontexts,
bi.pagetypepattern,
bi.subpagepattern,
bi.defaultregion,
bi.defaultweight,
COALESCE(bp.visible, 1) AS visible,
COALESCE(bp.region, bi.defaultregion) AS region,
COALESCE(bp.weight, bi.defaultweight) AS weight,
bi.configdata,
ctx.id AS ctxid,
ctx.path AS ctxpath,
ctx.depth AS ctxdepth,
ctx.contextlevel AS ctxlevel
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
JOIN {context} ctx ON ctx.contextlevel = :contextblock
AND ctx.instanceid = bi.id
WHERE
$contexttest
AND bi.pagetypepattern $pagetypepatterntest
AND (bi.subpagepattern IS NULL OR bi.subpagepattern = :subpage2)
$visiblecheck
AND b.visible = 1
ORDER BY
COALESCE(bp.region, bi.defaultregion),
COALESCE(bp.weight, bi.defaultweight),
bi.id";
$blockinstances = $DB->get_recordset_sql($sql, $params + $parentcontextparams + $pagetypepatternparams);
$this->birecordsbyregion = $this->prepare_per_region_arrays();
$unknown = array();
foreach ($blockinstances as $bi) {
$bi = make_context_subobj($bi);
if ($this->is_known_region($bi->region)) {
$this->birecordsbyregion[$bi->region][] = $bi;
} else {
$unknown[] = $bi;
}
}
// Pages don't necessarily have a defaultregion. The one time this can
// happen is when there are no theme block regions, but the script itself
// has a block region in the main content area.
if (!empty($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;
$this->check_known_block_type($blockname);
$this->check_region_is_known($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->id = $DB->insert_record('block_instances', $blockinstance);
// Ensure the block context is created.
get_context_instance(CONTEXT_BLOCK, $blockinstance->id);
// If the new instance was created, allow it to do additional setup
if ($block = block_instance($blockname, $blockinstance)) {
$block->instance_create();
}
}
public function add_block_at_end_of_default_region($blockname) {
$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-*';
}
$this->add_block($blockname, $defaulregion, $weight, false, $pagetypepattern, $subpage);
}
/**
* Convenience method, calls add_block repeatedly for all the blocks in $blocks.
*
* @param array $blocks array with array keys the region names, and values an array of block names.
* @param string $pagetypepattern optional. Passed to @see add_block()
* @param string $subpagepattern optional. Passed to @see add_block()
*/
public function add_blocks($blocks, $pagetypepattern = NULL, $subpagepattern = NULL, $showinsubcontexts=false, $weight=0) {
$this->add_regions(array_keys($blocks));
foreach ($blocks as $region => $regionblocks) {
$weight = 0;
foreach ($regionblocks as $blockname) {
$this->add_block($blockname, $region, $weight, $showinsubcontexts, $pagetypepattern, $subpagepattern);
$weight += 1;
}
}
}
/**
* 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 postition 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;
$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 $instanceid
* @return object
*/
public function find_instance($instanceid) {
foreach ($this->regions as $region => $notused) {
$this->ensure_instances_exist($region);
foreach($this->blockinstances[$region] as $instance) {
if ($instance->instance->id == $instanceid) {
return $instance;
}
}
}
throw new block_not_on_page_exception($instanceid, $this->page);
}
/// Inner workings =============================================================
/**
* Check whether the page blocks have been loaded yet
*
* @return void Throws coding exception if already loaded
*/
protected function check_not_yet_loaded() {
if (!is_null($this->birecordsbyregion)) {
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.');
}
}
/**
* Check whether the page blocks have been loaded yet
*
* Nearly identical to the above function {@link check_not_yet_loaded()} except different message
*
* @return void Throws coding exception if already loaded
*/
protected function check_is_loaded() {
if (is_null($this->birecordsbyregion)) {
throw new coding_exception('block_manager has not yet loaded the blocks, to it is too soon to request the information you asked for.');
}
}
/**
* Check if a block type is known and usable
*
* @param string $blockname The block type name to search for
* @param bool $includeinvisible Include disabled block types in the intial pass
* @return void Coding Exception thrown if unknown or not enabled
*/
protected function check_known_block_type($blockname, $includeinvisible = false) {
if (!$this->is_known_block_type($blockname, $includeinvisible)) {
if ($this->is_known_block_type($blockname, true)) {
throw new coding_exception('Unknown block type ' . $blockname);
} else {
throw new coding_exception('Block type ' . $blockname . ' has been disabled by the administrator.');
}
}
}
/**
* Check if a region is known by its name
*
* @param string $region
* @return void Coding Exception thrown if the region is not known
*/
protected function check_region_is_known($region) {
if (!$this->is_known_region($region)) {
throw new coding_exception('Trying to reference an unknown block region ' . $region);
}
}
/**
* Returns an array of region names as keys and nested arrays for values
*
* @return array an array where the array keys are the region names, and the array
* values are empty arrays.
*/
protected function prepare_per_region_arrays() {
$result = array();
foreach ($this->regions as $region => $notused) {
$result[$region] = array();
}
return $result;
}
/**
* Create a set of new block instance from a record array
*
* @param array $birecords An array of block instance records
* @return array An array of instantiated block_instance objects
*/
protected function create_block_instances($birecords) {
$results = array();
foreach ($birecords as $record) {
if ($blockobject = block_instance($record->blockname, $record, $this->page)) {
$results[] = $blockobject;
}
}
return $results;
}
/**
* Create all the bock instances for all the blocks that were loaded by
* load_blocks. This is used, for example, to ensure that all blocks get a
* chance to initialise themselves via the {@link block_base::specialize()}
* method, before any output is done.
*/
public function create_all_block_instances() {
foreach ($this->get_regions() as $region) {
$this->ensure_instances_exist($region);
}
}
/**
* Return an array of content objects from a set of block instances
*
* @param array $instances An array of block instances
* @param moodle_renderer_base The renderer to use.
* @param string $region the region name.
* @return array An array of block_content (and possibly block_move_target) objects.
*/
protected function create_block_contents($instances, $output, $region) {
$results = array();
$lastweight = 0;
$lastblock = 0;
if ($this->movingblock) {
$first = reset($instances);
if ($first) {
$lastweight = $first->instance->weight - 2;
}
$strmoveblockhere = get_string('moveblockhere', 'block');
}
foreach ($instances as $instance) {
$content = $instance->get_content_for_output($output);
if (empty($content)) {
continue;
}
if ($this->movingblock && $lastweight != $instance->instance->weight &&
$content->blockinstanceid != $this->movingblock && $lastblock != $this->movingblock) {
$bmt = new block_move_target();
$bmt->text = $strmoveblockhere;
$bmt->url = $this->get_move_target_url($region, ($lastweight + $instance->instance->weight)/2);
$results[] = $bmt;
}
if ($content->blockinstanceid == $this->movingblock) {
$content->add_class('beingmoved');
$content->annotation .= get_string('movingthisblockcancel', 'block',
$output->link($this->page->url, get_string('cancel')));
}
$results[] = $content;
$lastweight = $instance->instance->weight;
$lastblock = $instance->instance->id;
}
if ($this->movingblock && $lastblock != $this->movingblock) {
$bmt = new block_move_target();
$bmt->text = $strmoveblockhere;
$bmt->url = $this->get_move_target_url($region, $lastweight + 1);
$results[] = $bmt;
}
return $results;
}
/**
* Ensure block instances exist for a given region
*
* @param string $region Check for bi's with the instance with this name
*/
protected function ensure_instances_exist($region) {
$this->check_region_is_known($region);
if (!array_key_exists($region, $this->blockinstances)) {
$this->blockinstances[$region] =
$this->create_block_instances($this->birecordsbyregion[$region]);
}
}
/**
* Ensure that there is some content within the given region
*
* @param string $region The name of the region to check
*/
protected function ensure_content_created($region, $output) {
$this->ensure_instances_exist($region);
if (!array_key_exists($region, $this->visibleblockcontent)) {
$contents = array();
if (array_key_exists($region, $this->extracontent)) {
$contents = $this->extracontent[$region];
}
$contents = array_merge($contents, $this->create_block_contents($this->blockinstances[$region], $output, $region));
if ($region == $this->defaultregion) {
$addblockui = block_add_block_ui($this->page, $output);
if ($addblockui) {
$contents[] = $addblockui;
}
}
$this->visibleblockcontent[$region] = $contents;
}
}
/// Process actions from the URL ===============================================
/**
* Get the appropriate list of editing icons for a block. This is used
* to set {@link block_contents::$controls} in {@link block_base::get_contents_for_output()}.
*
* @param $output The core_renderer to use when generating the output. (Need to get icon paths.)
* @return an array in the format for {@link block_contents::$controls}
*/
public function edit_controls($block) {
global $CFG;
if (!isset($CFG->undeletableblocktypes) || (!is_array($CFG->undeletableblocktypes) && !is_string($CFG->undeletableblocktypes))) {
$CFG->undeletableblocktypes = array('global_navigation_tree','settings_navigation_tree');
} else if (is_string($CFG->undeletableblocktypes)) {
$CFG->undeletableblocktypes = explode(',', $CFG->undeletableblocktypes);
}
$controls = array();
$actionurl = $this->page->url->out(false, array('sesskey'=> sesskey()), false);
// Assign roles icon.
if (has_capability('moodle/role:assign', $block->context)) {
$controls[] = array('url' => $CFG->wwwroot . '/' . $CFG->admin .
'/roles/assign.php?contextid=' . $block->context->id . '&returnurl=' . urlencode($this->page->url->out_returnurl()),
'icon' => 'i/roles', 'caption' => get_string('assignroles', 'role'));
}
if ($this->page->user_can_edit_blocks()) {
// Show/hide icon.
if ($block->instance->visible) {
$controls[] = array('url' => $actionurl . '&bui_hideid=' . $block->instance->id,
'icon' => 't/hide', 'caption' => get_string('hide'));
} else {
$controls[] = array('url' => $actionurl . '&bui_showid=' . $block->instance->id,
'icon' => 't/show', 'caption' => get_string('show'));
}
}
if ($this->page->user_can_edit_blocks() || $block->user_can_edit()) {
// Edit config icon - always show - needed for positioning UI.
$controls[] = array('url' => $actionurl . '&bui_editid=' . $block->instance->id,
'icon' => 't/edit', 'caption' => get_string('configuration'));
}
if ($this->page->user_can_edit_blocks() && $block->user_can_edit() && $block->user_can_addto($this->page)) {
if (!in_array($block->instance->blockname, $CFG->undeletableblocktypes)) {
// Delete icon.
$controls[] = array('url' => $actionurl . '&bui_deleteid=' . $block->instance->id,
'icon' => 't/delete', 'caption' => get_string('delete'));
}
}
if ($this->page->user_can_edit_blocks()) {
// Move icon.
$controls[] = array('url' => $actionurl . '&bui_moveid=' . $block->instance->id,
'icon' => 't/move', 'caption' => get_string('move'));
}
return $controls;
}
/**
* Process any block actions that were specified in the URL.
*
* This can only be done given a valid $page object.
*
* @param moodle_page $page the page to add blocks to.
* @return boolean true if anything was done. False if not.
*/
public function process_url_actions() {
if (!$this->page->user_is_editing()) {
return false;
}
return $this->process_url_add() || $this->process_url_delete() ||
$this->process_url_show_hide() || $this->process_url_edit() ||
$this->process_url_move();
}
/**
* Handle adding a block.
* @return boolean true if anything was done. False if not.
*/
public function process_url_add() {
$blocktype = optional_param('bui_addblock', null, PARAM_SAFEDIR);
if (!$blocktype) {
return false;
}
confirm_sesskey();
if (!$this->page->user_can_edit_blocks()) {
throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('addblock'));
}
if (!array_key_exists($blocktype, $this->get_addable_blocks())) {
throw new moodle_exception('cannotaddthisblocktype', '', $this->page->url->out(), $blocktype);
}
$this->add_block_at_end_of_default_region($blocktype);
// If the page URL was a guses, it will contain the bui_... param, so we must make sure it is not there.
$this->page->ensure_param_not_in_url('bui_addblock');
return true;
}
/**
* Handle deleting a block.
* @return boolean true if anything was done. False if not.
*/
public function process_url_delete() {
$blockid = optional_param('bui_deleteid', null, PARAM_INTEGER);
if (!$blockid) {
return false;
}
confirm_sesskey();
$block = $this->page->blocks->find_instance($blockid);
if (!$block->user_can_edit() || !$this->page->user_can_edit_blocks() || !$block->user_can_addto($this->page)) {
throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('deleteablock'));
}
blocks_delete_instance($block->instance);
// If the page URL was a guses, it will contain the bui_... param, so we must make sure it is not there.