C:/xampp/htdocs/moodle/blocks/moodleblock.class.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/>.



define('BLOCK_TYPE_LIST',    1);

define('BLOCK_TYPE_TEXT',    2);
define('BLOCK_TYPE_TREE',    3);

class block_base {

    var $str;

    var $title         = NULL;

    var $content_type  = BLOCK_TYPE_TEXT;

    var $content       = NULL;

    var $edit_controls = NULL;

    var $instance      = NULL;

    public $page       = NULL;

    public $context    = NULL;

    var $config        = NULL;

    var $cron          = NULL;


    function __construct() {
        $this->init();
    }

    function before_delete() {
    }

    function name() {
        // Returns the block name, as present in the class name,
        // the database, the block directory, etc etc.
        static $myname;
        if ($myname === NULL) {
            $myname = strtolower(get_class($this));
            $myname = substr($myname, strpos($myname, '_') + 1);
        }
        return $myname;
    }

    function get_content() {
        // This should be implemented by the derived class.
        return NULL;
    }

    function get_title() {
        // Intentionally doesn't check if a title is set. This is already done in _self_test()
        return $this->title;
    }

    function get_content_type() {
        // Intentionally doesn't check if a content_type is set. This is already done in _self_test()
        return $this->content_type;
    }

    function is_empty() {
        if ( !has_capability('moodle/block:view', $this->context) ) {
            return true;
        }

        $this->get_content();
        return(empty($this->content->text) && empty($this->content->footer));
    }

    function refresh_content() {
        // Nothing special here, depends on content()
        $this->content = NULL;
        return $this->get_content();
    }

    public function get_content_for_output($output) {
        global $CFG;

        $bc = new block_contents($this->html_attributes());

        $bc->blockinstanceid = $this->instance->id;
        $bc->blockpositionid = $this->instance->blockpositionid;

        if ($this->instance->visible) {
            $bc->content = $this->formatted_contents($output);
            if (!empty($this->content->footer)) {
                $bc->footer = $this->content->footer;
            }
        } else {
            $bc->add_class('invisible');
        }

        if (!$this->hide_header()) {
            $bc->title = $this->title;
        }

        if ($this->page->user_is_editing()) {
            $bc->controls = $this->page->blocks->edit_controls($this);
        } else {
            // we must not use is_empty on hidden blocks
            if ($this->is_empty() && !$bc->controls) {
                return null;
            }
        }

        if (empty($CFG->allowuserblockhiding) ||
                (empty($bc->content) && empty($bc->footer))) {
            $bc->collapsible = block_contents::NOT_HIDEABLE;
        } else if (get_user_preferences('block' . $bc->blockinstanceid . 'hidden', false)) {
            $bc->collapsible = block_contents::HIDDEN;
        } else {
            $bc->collapsible = block_contents::VISIBLE;
        }

        $bc->annotation = ''; // TODO MDL-19398 need to work out what to say here.

        return $bc;
    }

    protected function formatted_contents($output) {
        $this->get_content();
        $this->get_required_javascript();
        if (!empty($this->content->text)) {
            return $this->content->text;
        } else {
            return '';
        }
    }

    function _self_test() {
        // Tests if this block has been implemented correctly.
        // Also, $errors isn't used right now
        $errors = array();

        $correct = true;
        if ($this->get_title() === NULL) {
            $errors[] = 'title_not_set';
            $correct = false;
        }
        if (!in_array($this->get_content_type(), array(BLOCK_TYPE_LIST, BLOCK_TYPE_TEXT, BLOCK_TYPE_TREE))) {
            $errors[] = 'invalid_content_type';
            $correct = false;
        }
        //following selftest was not working when roles&capabilities were used from block
/*        if ($this->get_content() === NULL) {
            $errors[] = 'content_not_set';
            $correct = false;
        }*/
        $formats = $this->applicable_formats();
        if (empty($formats) || array_sum($formats) === 0) {
            $errors[] = 'no_formats';
            $correct = false;
        }

        $width = $this->preferred_width();
        if (!is_int($width) || $width <= 0) {
            $errors[] = 'invalid_width';
            $correct = false;
        }
        return $correct;
    }

    function has_config() {
        return false;
    }

    function config_save($data) {
        foreach ($data as $name => $value) {
            set_config($name, $value);
        }
        return true;
    }

    function applicable_formats() {
        // Default case: the block can be used in courses and site index, but not in activities
        return array('all' => true, 'mod' => false, 'tag' => false);
    }


    function hide_header() {
        return false;
    }

    function html_attributes() {
        $attributes = array(
            'id' => 'inst' . $this->instance->id,
            'class' => 'block_' . $this->name(). '  block'
        );
        if ($this->instance_can_be_docked() && get_user_preferences('docked_block_instance_'.$this->instance->id, 0)) {
            $attributes['class'] .= ' dock_on_load';
        }
        return $attributes;
    }

    function _load_instance($instance, $page) {
        if (!empty($instance->configdata)) {
            $this->config = unserialize(base64_decode($instance->configdata));
        }
        $this->instance = $instance;
        $this->context = get_context_instance(CONTEXT_BLOCK, $instance->id);
        $this->page = $page;
        $this->specialization();
    }

    function get_required_javascript() {
        if ($this->instance_can_be_docked() && !$this->hide_header()) {
            $this->page->requires->js_init_call('M.core_dock.init_genericblock', array($this->instance->id));
            user_preference_allow_ajax_update('docked_block_instance_'.$this->instance->id, PARAM_INT);
        }
    }

    function specialization() {
        // Just to make sure that this method exists.
    }

    function instance_allow_config() {
        return false;
    }

    function instance_allow_multiple() {
        // Are you going to allow multiple instances of each block?
        // If yes, then it is assumed that the block WILL USE per-instance configuration
        return false;
    }

    function instance_config_print() {
        global $CFG, $DB, $OUTPUT;
        // Default behavior: print the config_instance.html file
        // You don't need to override this if you're satisfied with the above
        if (!$this->instance_allow_multiple() && !$this->instance_allow_config()) {
            return false;
        }

        if (is_file($CFG->dirroot .'/blocks/'. $this->name() .'/config_instance.html')) {
            echo $OUTPUT->box_start('generalbox boxaligncenter blockconfiginstance');
            include($CFG->dirroot .'/blocks/'. $this->name() .'/config_instance.html');
            echo $OUTPUT->box_end();
        } else {
            notice(get_string('blockconfigbad'), str_replace('blockaction=', 'dummy=', qualified_me()));
        }

        return true;
    }

    function instance_config_save($data, $nolongerused = false) {
        global $DB;
        $DB->set_field('block_instances', 'configdata', base64_encode(serialize($data)),
                array('id' => $this->instance->id));
    }

    function instance_config_commit($nolongerused = false) {
        global $DB;
        $this->instance_config_save($this->config);
    }

    function instance_create() {
        return true;
    }

    function instance_delete() {
        return true;
    }

    function user_can_edit() {
        global $USER;

        if (has_capability('moodle/block:edit', $this->context)) {
            return true;
        }

        // The blocks in My Moodle are a special case.  We want them to inherit from the user context.
        if (!empty($USER->id)
            && $this->instance->parentcontextid == $this->page->context->id   // Block belongs to this page
            && $this->page->context->contextlevel == CONTEXT_USER             // Page belongs to a user
            && $this->page->context->instanceid == $USER->id) {               // Page belongs to this user
            return has_capability('moodle/my:manageblocks', $this->page->context);
        }

        return false;
    }

    function user_can_addto($page) {
        global $USER;

        if (has_capability('moodle/block:edit', $page->context)) {
            return true;
        }

        // The blocks in My Moodle are a special case and use a different capability.
        if (!empty($USER->id)
            && $page->context->contextlevel == CONTEXT_USER             // Page belongs to a user
            && $page->context->instanceid == $USER->id) {               // Page belongs to this user
            return has_capability('moodle/my:manageblocks', $page->context);
        }

        return false;
    }

    function get_extra_capabilities() {
        return array('moodle/block:view', 'moodle/block:edit');
    }

    // Methods deprecated in Moodle 2.0 ========================================

    function preferred_width() {
        return 180;
    }

    function _print_block() {
        throw new coding_exception('_print_block is no longer used. It was a private ' .
                'method of the block class, only for use by the blocks system. You ' .
                'should not have been calling it anyway.');
    }

    function _print_shadow() {
        throw new coding_exception('_print_shadow is no longer used. It was a private ' .
                'method of the block class, only for use by the blocks system. You ' .
                'should not have been calling it anyway.');
    }

    function _title_html() {
        throw new coding_exception('_title_html is no longer used. It was a private ' .
                'method of the block class, only for use by the blocks system. You ' .
                'should not have been calling it anyway.');
    }

    function _add_edit_controls() {
        throw new coding_exception('_add_edit_controls is no longer used. It was a private ' .
                'method of the block class, only for use by the blocks system. You ' .
                'should not have been calling it anyway.');
    }

    function config_print() {
        throw new coding_exception('config_print() can no longer be used. Blocks should use a settings.php file.');
    }

    public function instance_can_be_docked() {
        global $CFG;
        return (!empty($CFG->allowblockstodock) && $this->page->theme->enable_dock);
    }

    public function instance_can_be_hidden() {
        return true;
    }

    public static function comment_template($options) {
        $ret = <<<EOD
<div class="comment-userpicture">___picture___</div>
<div class="comment-content">
    ___name___ - <span>___time___</span>
    <div>___content___</div>
</div>
EOD;
        return $ret;
    }
    public static function comment_permissions($options) {
        return array('view'=>true, 'post'=>true);
    }
    public static function comment_url($options) {
        return null;
    }
    public static function comment_display($comments, $options) {
        return $comments;
    }
    public static function comment_add(&$comments, $options) {
        return true;
    }
}

class block_list extends block_base {
    var $content_type  = BLOCK_TYPE_LIST;

    function is_empty() {
        if ( !has_capability('moodle/block:view', $this->context) ) {
            return true;
        }

        $this->get_content();
        return (empty($this->content->items) && empty($this->content->footer));
    }

    protected function formatted_contents($output) {
        $this->get_content();
        $this->get_required_javascript();
        if (!empty($this->content->items)) {
            return $output->list_block_contents($this->content->icons, $this->content->items);
        } else {
            return '';
        }
    }

    function html_attributes() {
        $attributes = parent::html_attributes();
        $attributes['class'] .= ' list_block';
        return $attributes;
    }

}

class block_tree extends block_list {

    public $content_type = BLOCK_TYPE_TREE;

    protected function formatted_contents($output) {
        // based of code in admin_tree
        global $PAGE; // TODO change this when there is a proper way for blocks to get stuff into head.
        static $eventattached;
        if ($eventattached===null) {
            $eventattached = true;
        }
        if (!$this->content) {
            $this->content = new stdClass;
            $this->content->items = array();
        }
        $this->get_required_javascript();
        $this->get_content();
        $content = $output->tree_block_contents($this->content->items,array('class'=>'block_tree list'));
        if (isset($this->id) && !is_numeric($this->id)) {
            $content = $output->box($content, 'block_tree_box', $this->id);
        }
        return $content;
    }
}