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 * This file contains the parent class for moodle blocks, block_base.
23 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
29 * Block type of list. Contents of block should be set as an associative array in the content object as items ($this->content->items). Optionally include footer text in $this->content->footer.
31 define('BLOCK_TYPE_LIST', 1);
34 * Block type of text. Contents of block should be set to standard html text in the content object as items ($this->content->text). Optionally include footer text in $this->content->footer.
36 define('BLOCK_TYPE_TEXT', 2);
38 * Block type of tree. $this->content->items is a list of tree_item objects and $this->content->footer is a string.
40 define('BLOCK_TYPE_TREE', 3);
43 * Class for describing a moodle block, all Moodle blocks derive from this class
45 * @author Jon Papaioannou
51 * Internal var for storing/caching translated strings
57 * The title of the block to be displayed in the block title area.
63 * The type of content that this block creates. Currently support options - BLOCK_TYPE_LIST, BLOCK_TYPE_TEXT
64 * @var int $content_type
66 var $content_type = BLOCK_TYPE_TEXT
;
69 * An object to contain the information to be displayed in the block.
70 * @var stdObject $content
75 * A string generated by {@link _add_edit_controls()} to display block manipulation links when the user is in editing mode.
76 * @var string $edit_controls
78 var $edit_controls = NULL;
81 * The initialized instance of this block object.
82 * @var block $instance
87 * The page that this block is appearing on.
93 * This blocks's context.
96 public $context = NULL;
99 * An object containing the instance configuration information for the current instance of this block.
100 * @var stdObject $config
105 * How often the cronjob should run, 0 if not at all.
114 * Fake constructor to keep PHP5 happy
117 function __construct() {
122 * Function that can be overridden to do extra cleanup before
123 * the database tables are deleted. (Called once per block, not per instance!)
125 function before_delete() {
129 * Returns the block name, as present in the class name,
130 * the database, the block directory, etc etc.
135 // Returns the block name, as present in the class name,
136 // the database, the block directory, etc etc.
138 if ($myname === NULL) {
139 $myname = strtolower(get_class($this));
140 $myname = substr($myname, strpos($myname, '_') +
1);
146 * Parent class version of this function simply returns NULL
147 * This should be implemented by the derived class to return
148 * the content object.
152 function get_content() {
153 // This should be implemented by the derived class.
158 * Returns the class $title var value.
160 * Intentionally doesn't check if a title is set.
161 * This is already done in {@link _self_test()}
163 * @return string $this->title
165 function get_title() {
166 // Intentionally doesn't check if a title is set. This is already done in _self_test()
171 * Returns the class $content_type var value.
173 * Intentionally doesn't check if content_type is set.
174 * This is already done in {@link _self_test()}
176 * @return string $this->content_type
178 function get_content_type() {
179 // Intentionally doesn't check if a content_type is set. This is already done in _self_test()
180 return $this->content_type
;
184 * Returns true or false, depending on whether this block has any content to display
185 * and whether the user has permission to view the block
189 function is_empty() {
190 if ( !has_capability('moodle/block:view', $this->context
) ) {
194 $this->get_content();
195 return(empty($this->content
->text
) && empty($this->content
->footer
));
199 * First sets the current value of $this->content to NULL
200 * then calls the block's {@link get_content()} function
201 * to set its value back.
205 function refresh_content() {
206 // Nothing special here, depends on content()
207 $this->content
= NULL;
208 return $this->get_content();
212 * Return a block_contents object representing the full contents of this block.
214 * This internally calls ->get_content(), and then adds the editing controls etc.
216 * You probably should not override this method, but instead override
217 * {@link html_attributes()}, {@link formatted_contents()} or {@link get_content()},
218 * {@link hide_header()}, {@link (get_edit_controls)}, etc.
220 * @return block_contents a representation of the block, for rendering.
223 public function get_content_for_output($output) {
226 $bc = new block_contents($this->html_attributes());
228 $bc->blockinstanceid
= $this->instance
->id
;
229 $bc->blockpositionid
= $this->instance
->blockpositionid
;
231 if ($this->instance
->visible
) {
232 $bc->content
= $this->formatted_contents($output);
233 if (!empty($this->content
->footer
)) {
234 $bc->footer
= $this->content
->footer
;
237 $bc->add_class('invisible');
240 if (!$this->hide_header()) {
241 $bc->title
= $this->title
;
244 if ($this->page
->user_is_editing()) {
245 $bc->controls
= $this->page
->blocks
->edit_controls($this);
247 // we must not use is_empty on hidden blocks
248 if ($this->is_empty() && !$bc->controls
) {
253 if (empty($CFG->allowuserblockhiding
)
254 ||
(empty($bc->content
) && empty($bc->footer
))
255 ||
!$this->instance_can_be_collapsed()) {
256 $bc->collapsible
= block_contents
::NOT_HIDEABLE
;
257 } else if (get_user_preferences('block' . $bc->blockinstanceid
. 'hidden', false)) {
258 $bc->collapsible
= block_contents
::HIDDEN
;
260 $bc->collapsible
= block_contents
::VISIBLE
;
263 $bc->annotation
= ''; // TODO MDL-19398 need to work out what to say here.
269 * Convert the contents of the block to HTML.
271 * This is used by block base classes like block_list to convert the structured
272 * $this->content->list and $this->content->icons arrays to HTML. So, in most
273 * blocks, you probaby want to override the {@link get_contents()} method,
274 * which generates that structured representation of the contents.
276 * @param $output The core_renderer to use when generating the output.
277 * @return string the HTML that should appearn in the body of the block.
280 protected function formatted_contents($output) {
281 $this->get_content();
282 $this->get_required_javascript();
283 if (!empty($this->content
->text
)) {
284 return $this->content
->text
;
291 * Tests if this block has been implemented correctly.
292 * Also, $errors isn't used right now
297 function _self_test() {
298 // Tests if this block has been implemented correctly.
299 // Also, $errors isn't used right now
303 if ($this->get_title() === NULL) {
304 $errors[] = 'title_not_set';
307 if (!in_array($this->get_content_type(), array(BLOCK_TYPE_LIST
, BLOCK_TYPE_TEXT
, BLOCK_TYPE_TREE
))) {
308 $errors[] = 'invalid_content_type';
311 //following selftest was not working when roles&capabilities were used from block
312 /* if ($this->get_content() === NULL) {
313 $errors[] = 'content_not_set';
316 $formats = $this->applicable_formats();
317 if (empty($formats) ||
array_sum($formats) === 0) {
318 $errors[] = 'no_formats';
322 $width = $this->preferred_width();
323 if (!is_int($width) ||
$width <= 0) {
324 $errors[] = 'invalid_width';
331 * Subclasses should override this and return true if the
332 * subclass block has a config_global.html file.
336 function has_config() {
341 * Default behavior: save all variables as $CFG properties
342 * You don't need to override this if you 're satisfied with the above
347 function config_save($data) {
348 foreach ($data as $name => $value) {
349 set_config($name, $value);
355 * Which page types this block may appear on.
357 * The information returned here is processed by the
358 * {@link blocks_name_allowed_in_format()} function. Look there if you need
359 * to know exactly how this works.
361 * Default case: everything except mod and tag.
363 * @return array page-type prefix => true/false.
365 function applicable_formats() {
366 // Default case: the block can be used in courses and site index, but not in activities
367 return array('all' => true, 'mod' => false, 'tag' => false);
372 * Default return is false - header will be shown
375 function hide_header() {
380 * Return any HTML attributes that you want added to the outer <div> that
381 * of the block when it is output.
383 * Because of the way certain JS events are wired it is a good idea to ensure
384 * that the default values here still get set.
385 * I found the easiest way to do this and still set anything you want is to
386 * override it within your block in the following way
389 * function html_attributes() {
390 * $attributes = parent::html_attributes();
391 * $attributes['class'] .= ' mynewclass';
392 * return $attributes;
396 * @return array attribute name => value.
398 function html_attributes() {
400 'id' => 'inst' . $this->instance
->id
,
401 'class' => 'block_' . $this->name(). ' block'
403 if ($this->instance_can_be_docked() && get_user_preferences('docked_block_instance_'.$this->instance
->id
, 0)) {
404 $attributes['class'] .= ' dock_on_load';
410 * Set up a particular instance of this class given data from the block_insances
411 * table and the current page. (See {@link block_manager::load_blocks()}.)
413 * @param stdClass $instance data from block_insances, block_positions, etc.
414 * @param moodle_page $the page this block is on.
416 function _load_instance($instance, $page) {
417 if (!empty($instance->configdata
)) {
418 $this->config
= unserialize(base64_decode($instance->configdata
));
420 $this->instance
= $instance;
421 $this->context
= context_block
::instance($instance->id
);
423 $this->specialization();
426 function get_required_javascript() {
427 if ($this->instance_can_be_docked() && !$this->hide_header()) {
428 $this->page
->requires
->js_init_call('M.core_dock.init_genericblock', array($this->instance
->id
));
429 user_preference_allow_ajax_update('docked_block_instance_'.$this->instance
->id
, PARAM_INT
);
434 * This function is called on your subclass right after an instance is loaded
435 * Use this function to act on instance data just after it's loaded and before anything else is done
436 * For instance: if your block will have different title's depending on location (site, course, blog, etc)
438 function specialization() {
439 // Just to make sure that this method exists.
443 * Is each block of this type going to have instance-specific configuration?
444 * Normally, this setting is controlled by {@link instance_allow_multiple()}: if multiple
445 * instances are allowed, then each will surely need its own configuration. However, in some
446 * cases it may be necessary to provide instance configuration to blocks that do not want to
447 * allow multiple instances. In that case, make this function return true.
448 * I stress again that this makes a difference ONLY if {@link instance_allow_multiple()} returns false.
451 function instance_allow_config() {
456 * Are you going to allow multiple instances of each block?
457 * If yes, then it is assumed that the block WILL USE per-instance configuration
460 function instance_allow_multiple() {
461 // Are you going to allow multiple instances of each block?
462 // If yes, then it is assumed that the block WILL USE per-instance configuration
467 * Default behavior: print the config_instance.html file
468 * You don't need to override this if you're satisfied with the above
470 * @deprecated since Moodle 2.0.
471 * @return boolean whether anything was done. Blocks should use edit_form.php.
473 function instance_config_print() {
474 global $CFG, $DB, $OUTPUT;
475 // Default behavior: print the config_instance.html file
476 // You don't need to override this if you're satisfied with the above
477 if (!$this->instance_allow_multiple() && !$this->instance_allow_config()) {
481 if (is_file($CFG->dirroot
.'/blocks/'. $this->name() .'/config_instance.html')) {
482 echo $OUTPUT->box_start('generalbox boxaligncenter blockconfiginstance');
483 include($CFG->dirroot
.'/blocks/'. $this->name() .'/config_instance.html');
484 echo $OUTPUT->box_end();
486 notice(get_string('blockconfigbad'), str_replace('blockaction=', 'dummy=', qualified_me()));
493 * Serialize and store config data
495 function instance_config_save($data, $nolongerused = false) {
497 $DB->set_field('block_instances', 'configdata', base64_encode(serialize($data)),
498 array('id' => $this->instance
->id
));
502 * Replace the instance's configuration data with those currently in $this->config;
504 function instance_config_commit($nolongerused = false) {
506 $this->instance_config_save($this->config
);
510 * Do any additional initialization you may need at the time a new block instance is created
513 function instance_create() {
518 * Delete everything related to this instance if you have been using persistent storage other than the configdata field.
521 function instance_delete() {
526 * Allows the block class to have a say in the user's ability to edit (i.e., configure) blocks of this type.
527 * The framework has first say in whether this will be allowed (e.g., no editing allowed unless in edit mode)
528 * but if the framework does allow it, the block can still decide to refuse.
531 function user_can_edit() {
534 if (has_capability('moodle/block:edit', $this->context
)) {
538 // The blocks in My Moodle are a special case. We want them to inherit from the user context.
539 if (!empty($USER->id
)
540 && $this->instance
->parentcontextid
== $this->page
->context
->id
// Block belongs to this page
541 && $this->page
->context
->contextlevel
== CONTEXT_USER
// Page belongs to a user
542 && $this->page
->context
->instanceid
== $USER->id
) { // Page belongs to this user
543 return has_capability('moodle/my:manageblocks', $this->page
->context
);
550 * Allows the block class to have a say in the user's ability to create new instances of this block.
551 * The framework has first say in whether this will be allowed (e.g., no adding allowed unless in edit mode)
552 * but if the framework does allow it, the block can still decide to refuse.
553 * This function has access to the complete page object, the creation related to which is being determined.
555 * @param moodle_page $page
558 function user_can_addto($page) {
561 if (has_capability('moodle/block:edit', $page->context
)) {
565 // The blocks in My Moodle are a special case and use a different capability.
566 if (!empty($USER->id
)
567 && $page->context
->contextlevel
== CONTEXT_USER
// Page belongs to a user
568 && $page->context
->instanceid
== $USER->id
) { // Page belongs to this user
569 return has_capability('moodle/my:manageblocks', $page->context
);
575 static function get_extra_capabilities() {
576 return array('moodle/block:view', 'moodle/block:edit');
579 // Methods deprecated in Moodle 2.0 ========================================
582 * Default case: the block wants to be 180 pixels wide
583 * @deprecated since Moodle 2.0.
586 function preferred_width() {
590 /** @deprecated since Moodle 2.0. */
591 function _print_block() {
592 throw new coding_exception('_print_block is no longer used. It was a private ' .
593 'method of the block class, only for use by the blocks system. You ' .
594 'should not have been calling it anyway.');
597 /** @deprecated since Moodle 2.0. */
598 function _print_shadow() {
599 throw new coding_exception('_print_shadow is no longer used. It was a private ' .
600 'method of the block class, only for use by the blocks system. You ' .
601 'should not have been calling it anyway.');
604 /** @deprecated since Moodle 2.0. */
605 function _title_html() {
606 throw new coding_exception('_title_html is no longer used. It was a private ' .
607 'method of the block class, only for use by the blocks system. You ' .
608 'should not have been calling it anyway.');
611 /** @deprecated since Moodle 2.0. */
612 function _add_edit_controls() {
613 throw new coding_exception('_add_edit_controls is no longer used. It was a private ' .
614 'method of the block class, only for use by the blocks system. You ' .
615 'should not have been calling it anyway.');
618 /** @deprecated since Moodle 2.0. */
619 function config_print() {
620 throw new coding_exception('config_print() can no longer be used. Blocks should use a settings.php file.');
624 * Can be overridden by the block to prevent the block from being dockable.
628 public function instance_can_be_docked() {
630 return (!empty($CFG->allowblockstodock
) && $this->page
->theme
->enable_dock
);
634 * If overridden and set to false by the block it will not be hidable when
635 * editing is turned on.
639 public function instance_can_be_hidden() {
644 * If overridden and set to false by the block it will not be collapsible.
648 public function instance_can_be_collapsed() {
652 /** @callback callback functions for comments api */
653 public static function comment_template($options) {
655 <div class="comment-userpicture">___picture___</div>
656 <div class="comment-content">
657 ___name___ - <span>___time___</span>
658 <div>___content___</div>
663 public static function comment_permissions($options) {
664 return array('view'=>true, 'post'=>true);
666 public static function comment_url($options) {
669 public static function comment_display($comments, $options) {
672 public static function comment_add(&$comments, $options) {
678 * Specialized class for displaying a block with a list of icons/text labels
680 * The get_content method should set $this->content->items and (optionally)
681 * $this->content->icons, instead of $this->content->text.
683 * @author Jon Papaioannou
687 class block_list
extends block_base
{
688 var $content_type = BLOCK_TYPE_LIST
;
690 function is_empty() {
691 if ( !has_capability('moodle/block:view', $this->context
) ) {
695 $this->get_content();
696 return (empty($this->content
->items
) && empty($this->content
->footer
));
699 protected function formatted_contents($output) {
700 $this->get_content();
701 $this->get_required_javascript();
702 if (!empty($this->content
->items
)) {
703 return $output->list_block_contents($this->content
->icons
, $this->content
->items
);
709 function html_attributes() {
710 $attributes = parent
::html_attributes();
711 $attributes['class'] .= ' list_block';
718 * Specialized class for displaying a tree menu.
720 * The {@link get_content()} method involves setting the content of
721 * <code>$this->content->items</code> with an array of {@link tree_item}
722 * objects (these are the top-level nodes). The {@link tree_item::children}
723 * property may contain more tree_item objects, and so on. The tree_item class
724 * itself is abstract and not intended for use, use one of it's subclasses.
726 * Unlike {@link block_list}, the icons are specified as part of the items,
727 * not in a separate array.
731 * @internal this extends block_list so we get is_empty() for free
733 class block_tree
extends block_list
{
736 * @var int specifies the manner in which contents should be added to this
737 * block type. In this case <code>$this->content->items</code> is used with
738 * {@link tree_item}s.
740 public $content_type = BLOCK_TYPE_TREE
;
743 * Make the formatted HTML ouput.
745 * Also adds the required javascript call to the page output.
747 * @param core_renderer $output
748 * @return string HTML
750 protected function formatted_contents($output) {
751 // based of code in admin_tree
752 global $PAGE; // TODO change this when there is a proper way for blocks to get stuff into head.
753 static $eventattached;
754 if ($eventattached===null) {
755 $eventattached = true;
757 if (!$this->content
) {
758 $this->content
= new stdClass
;
759 $this->content
->items
= array();
761 $this->get_required_javascript();
762 $this->get_content();
763 $content = $output->tree_block_contents($this->content
->items
,array('class'=>'block_tree list'));
764 if (isset($this->id
) && !is_numeric($this->id
)) {
765 $content = $output->box($content, 'block_tree_box', $this->id
);