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outputrenderers.php
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outputrenderers.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/>.
/**
* Classes for rendering HTML output for Moodle.
*
* Please see http://docs.moodle.org/en/Developement:How_Moodle_outputs_HTML
* for an overview.
*
* @package core
* @subpackage lib
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* Simple base class for Moodle renderers.
*
* Tracks the xhtml_container_stack to use, which is passed in in the constructor.
*
* Also has methods to facilitate generating HTML output.
*
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
*/
class renderer_base {
/** @var xhtml_container_stack the xhtml_container_stack to use. */
protected $opencontainers;
/** @var moodle_page the page we are rendering for. */
protected $page;
/** @var requested rendering target */
protected $target;
/**
* Constructor
* @param moodle_page $page the page we are doing output for.
* @param string $target one of rendering target constants
*/
public function __construct(moodle_page $page, $target) {
$this->opencontainers = $page->opencontainers;
$this->page = $page;
$this->target = $target;
}
/**
* Returns rendered widget.
* @param renderable $widget instance with renderable interface
* @return string
*/
public function render(renderable $widget) {
$rendermethod = 'render_'.get_class($widget);
if (method_exists($this, $rendermethod)) {
return $this->$rendermethod($widget);
}
throw new coding_exception('Can not render widget, renderer method ('.$rendermethod.') not found.');
}
/**
* Adds JS handlers needed for event execution for one html element id
* @param component_action $actions
* @param string $id
* @return string id of element, either original submitted or random new if not supplied
*/
public function add_action_handler(component_action $action, $id=null) {
if (!$id) {
$id = html_writer::random_id($action->event);
}
$this->page->requires->event_handler("#$id", $action->event, $action->jsfunction, $action->jsfunctionargs);
return $id;
}
/**
* Have we started output yet?
* @return boolean true if the header has been printed.
*/
public function has_started() {
return $this->page->state >= moodle_page::STATE_IN_BODY;
}
/**
* Given an array or space-separated list of classes, prepares and returns the HTML class attribute value
* @param mixed $classes Space-separated string or array of classes
* @return string HTML class attribute value
*/
public static function prepare_classes($classes) {
if (is_array($classes)) {
return implode(' ', array_unique($classes));
}
return $classes;
}
/**
* Return the moodle_url for an image.
* The exact image location and extension is determined
* automatically by searching for gif|png|jpg|jpeg, please
* note there can not be diferent images with the different
* extension. The imagename is for historical reasons
* a relative path name, it may be changed later for core
* images. It is recommended to not use subdirectories
* in plugin and theme pix directories.
*
* There are three types of images:
* 1/ theme images - stored in theme/mytheme/pix/,
* use component 'theme'
* 2/ core images - stored in /pix/,
* overridden via theme/mytheme/pix_core/
* 3/ plugin images - stored in mod/mymodule/pix,
* overridden via theme/mytheme/pix_plugins/mod/mymodule/,
* example: pix_url('comment', 'mod_glossary')
*
* @param string $imagename the pathname of the image
* @param string $component full plugin name (aka component) or 'theme'
* @return moodle_url
*/
public function pix_url($imagename, $component = 'moodle') {
return $this->page->theme->pix_url($imagename, $component);
}
}
/**
* Basis for all plugin renderers.
*
* @author Petr Skoda (skodak)
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
*/
class plugin_renderer_base extends renderer_base {
/**
* A reference to the current general renderer probably {@see core_renderer}
* @var renderer_base
*/
protected $output;
/**
* Constructor method, calls the parent constructor
* @param moodle_page $page
* @param string $target one of rendering target constants
*/
public function __construct(moodle_page $page, $target) {
$this->output = $page->get_renderer('core', null, $target);
parent::__construct($page, $target);
}
/**
* Returns rendered widget.
* @param renderable $widget instance with renderable interface
* @return string
*/
public function render(renderable $widget) {
$rendermethod = 'render_'.get_class($widget);
if (method_exists($this, $rendermethod)) {
return $this->$rendermethod($widget);
}
// pass to core renderer if method not found here
return $this->output->render($widget);
}
/**
* Magic method used to pass calls otherwise meant for the standard renderer
* to it to ensure we don't go causing unnecessary grief.
*
* @param string $method
* @param array $arguments
* @return mixed
*/
public function __call($method, $arguments) {
if (method_exists('renderer_base', $method)) {
throw new coding_exception('Protected method called against '.__CLASS__.' :: '.$method);
}
if (method_exists($this->output, $method)) {
return call_user_func_array(array($this->output, $method), $arguments);
} else {
throw new coding_exception('Unknown method called against '.__CLASS__.' :: '.$method);
}
}
}
/**
* The standard implementation of the core_renderer interface.
*
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
*/
class core_renderer extends renderer_base {
/**
* Do NOT use, please use <?php echo $OUTPUT->main_content() ?>
* in layout files instead.
* @var string used in {@link header()}.
* @deprecated
*/
const MAIN_CONTENT_TOKEN = '[MAIN CONTENT GOES HERE]';
/** @var string used to pass information from {@link doctype()} to {@link standard_head_html()}. */
protected $contenttype;
/** @var string used by {@link redirect_message()} method to communicate with {@link header()}. */
protected $metarefreshtag = '';
/** @var string unique token */
protected $unique_end_html_token;
/** @var string unique token */
protected $unique_performance_info_token;
/** @var string unique token */
protected $unique_main_content_token;
/**
* Constructor
* @param moodle_page $page the page we are doing output for.
* @param string $target one of rendering target constants
*/
public function __construct(moodle_page $page, $target) {
$this->opencontainers = $page->opencontainers;
$this->page = $page;
$this->target = $target;
$this->unique_end_html_token = '%%ENDHTML-'.sesskey().'%%';
$this->unique_performance_info_token = '%%PERFORMANCEINFO-'.sesskey().'%%';
$this->unique_main_content_token = '[MAIN CONTENT GOES HERE - '.sesskey().']';
}
/**
* Get the DOCTYPE declaration that should be used with this page. Designed to
* be called in theme layout.php files.
* @return string the DOCTYPE declaration (and any XML prologue) that should be used.
*/
public function doctype() {
global $CFG;
$doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">' . "\n";
$this->contenttype = 'text/html; charset=utf-8';
if (empty($CFG->xmlstrictheaders)) {
return $doctype;
}
// We want to serve the page with an XML content type, to force well-formedness errors to be reported.
$prolog = '<?xml version="1.0" encoding="utf-8"?>' . "\n";
if (isset($_SERVER['HTTP_ACCEPT']) && strpos($_SERVER['HTTP_ACCEPT'], 'application/xhtml+xml') !== false) {
// Firefox and other browsers that can cope natively with XHTML.
$this->contenttype = 'application/xhtml+xml; charset=utf-8';
} else if (preg_match('/MSIE.*Windows NT/', $_SERVER['HTTP_USER_AGENT'])) {
// IE can't cope with application/xhtml+xml, but it will cope if we send application/xml with an XSL stylesheet.
$this->contenttype = 'application/xml; charset=utf-8';
$prolog .= '<?xml-stylesheet type="text/xsl" href="' . $CFG->httpswwwroot . '/lib/xhtml.xsl"?>' . "\n";
} else {
$prolog = '';
}
return $prolog . $doctype;
}
/**
* The attributes that should be added to the <html> tag. Designed to
* be called in theme layout.php files.
* @return string HTML fragment.
*/
public function htmlattributes() {
return get_html_lang(true) . ' xmlns="http://www.w3.org/1999/xhtml"';
}
/**
* The standard tags (meta tags, links to stylesheets and JavaScript, etc.)
* that should be included in the <head> tag. Designed to be called in theme
* layout.php files.
* @return string HTML fragment.
*/
public function standard_head_html() {
global $CFG, $SESSION;
$output = '';
$output .= '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />' . "\n";
$output .= '<meta name="keywords" content="moodle, ' . $this->page->title . '" />' . "\n";
if (!$this->page->cacheable) {
$output .= '<meta http-equiv="pragma" content="no-cache" />' . "\n";
$output .= '<meta http-equiv="expires" content="0" />' . "\n";
}
// This is only set by the {@link redirect()} method
$output .= $this->metarefreshtag;
// Check if a periodic refresh delay has been set and make sure we arn't
// already meta refreshing
if ($this->metarefreshtag=='' && $this->page->periodicrefreshdelay!==null) {
$output .= '<meta http-equiv="refresh" content="'.$this->page->periodicrefreshdelay.';url='.$this->page->url->out().'" />';
}
// flow player embedding support
$this->page->requires->js_function_call('M.util.load_flowplayer');
$this->page->requires->js_function_call('setTimeout', array('fix_column_widths()', 20));
$focus = $this->page->focuscontrol;
if (!empty($focus)) {
if (preg_match("#forms\['([a-zA-Z0-9]+)'\].elements\['([a-zA-Z0-9]+)'\]#", $focus, $matches)) {
// This is a horrifically bad way to handle focus but it is passed in
// through messy formslib::moodleform
$this->page->requires->js_function_call('old_onload_focus', array($matches[1], $matches[2]));
} else if (strpos($focus, '.')!==false) {
// Old style of focus, bad way to do it
debugging('This code is using the old style focus event, Please update this code to focus on an element id or the moodleform focus method.', DEBUG_DEVELOPER);
$this->page->requires->js_function_call('old_onload_focus', explode('.', $focus, 2));
} else {
// Focus element with given id
$this->page->requires->js_function_call('focuscontrol', array($focus));
}
}
// Get the theme stylesheet - this has to be always first CSS, this loads also styles.css from all plugins;
// any other custom CSS can not be overridden via themes and is highly discouraged
$urls = $this->page->theme->css_urls($this->page);
foreach ($urls as $url) {
$this->page->requires->css_theme($url);
}
// Get the theme javascript head and footer
$jsurl = $this->page->theme->javascript_url(true);
$this->page->requires->js($jsurl, true);
$jsurl = $this->page->theme->javascript_url(false);
$this->page->requires->js($jsurl);
// Get any HTML from the page_requirements_manager.
$output .= $this->page->requires->get_head_code($this->page, $this);
// List alternate versions.
foreach ($this->page->alternateversions as $type => $alt) {
$output .= html_writer::empty_tag('link', array('rel' => 'alternate',
'type' => $type, 'title' => $alt->title, 'href' => $alt->url));
}
if (!empty($CFG->additionalhtmlhead)) {
$output .= "\n".$CFG->additionalhtmlhead;
}
return $output;
}
/**
* The standard tags (typically skip links) that should be output just inside
* the start of the <body> tag. Designed to be called in theme layout.php files.
* @return string HTML fragment.
*/
public function standard_top_of_body_html() {
global $CFG;
$output = $this->page->requires->get_top_of_body_code();
if (!empty($CFG->additionalhtmltopofbody)) {
$output .= "\n".$CFG->additionalhtmltopofbody;
}
return $output;
}
/**
* The standard tags (typically performance information and validation links,
* if we are in developer debug mode) that should be output in the footer area
* of the page. Designed to be called in theme layout.php files.
* @return string HTML fragment.
*/
public function standard_footer_html() {
global $CFG, $SCRIPT;
// This function is normally called from a layout.php file in {@link header()}
// but some of the content won't be known until later, so we return a placeholder
// for now. This will be replaced with the real content in {@link footer()}.
$output = $this->unique_performance_info_token;
if ($this->page->devicetypeinuse == 'legacy') {
// The legacy theme is in use print the notification
$output .= html_writer::tag('div', get_string('legacythemeinuse'), array('class'=>'legacythemeinuse'));
}
// Get links to switch device types (only shown for users not on a default device)
$output .= $this->theme_switch_links();
if (!empty($CFG->debugpageinfo)) {
$output .= '<div class="performanceinfo pageinfo">This page is: ' . $this->page->debug_summary() . '</div>';
}
if (debugging(null, DEBUG_DEVELOPER) and has_capability('moodle/site:config', get_context_instance(CONTEXT_SYSTEM))) { // Only in developer mode
// Add link to profiling report if necessary
if (function_exists('profiling_is_running') && profiling_is_running()) {
$txt = get_string('profiledscript', 'admin');
$title = get_string('profiledscriptview', 'admin');
$url = $CFG->wwwroot . '/admin/tool/profiling/index.php?script=' . urlencode($SCRIPT);
$link= '<a title="' . $title . '" href="' . $url . '">' . $txt . '</a>';
$output .= '<div class="profilingfooter">' . $link . '</div>';
}
$output .= '<div class="purgecaches"><a href="'.$CFG->wwwroot.'/'.$CFG->admin.'/purgecaches.php?confirm=1&sesskey='.sesskey().'">'.get_string('purgecaches', 'admin').'</a></div>';
}
if (!empty($CFG->debugvalidators)) {
$output .= '<div class="validators"><ul>
<li><a href="http://validator.w3.org/check?verbose=1&ss=1&uri=' . urlencode(qualified_me()) . '">Validate HTML</a></li>
<li><a href="http://www.contentquality.com/mynewtester/cynthia.exe?rptmode=-1&url1=' . urlencode(qualified_me()) . '">Section 508 Check</a></li>
<li><a href="http://www.contentquality.com/mynewtester/cynthia.exe?rptmode=0&warnp2n3e=1&url1=' . urlencode(qualified_me()) . '">WCAG 1 (2,3) Check</a></li>
</ul></div>';
}
if (!empty($CFG->additionalhtmlfooter)) {
$output .= "\n".$CFG->additionalhtmlfooter;
}
return $output;
}
/**
* Returns standard main content placeholder.
* Designed to be called in theme layout.php files.
* @return string HTML fragment.
*/
public function main_content() {
return $this->unique_main_content_token;
}
/**
* The standard tags (typically script tags that are not needed earlier) that
* should be output after everything else, . Designed to be called in theme layout.php files.
* @return string HTML fragment.
*/
public function standard_end_of_body_html() {
// This function is normally called from a layout.php file in {@link header()}
// but some of the content won't be known until later, so we return a placeholder
// for now. This will be replaced with the real content in {@link footer()}.
return $this->unique_end_html_token;
}
/**
* Return the standard string that says whether you are logged in (and switched
* roles/logged in as another user).
* @return string HTML fragment.
*/
public function login_info() {
global $USER, $CFG, $DB, $SESSION;
if (during_initial_install()) {
return '';
}
$loginapge = ((string)$this->page->url === get_login_url());
$course = $this->page->course;
if (session_is_loggedinas()) {
$realuser = session_get_realuser();
$fullname = fullname($realuser, true);
$realuserinfo = " [<a href=\"$CFG->wwwroot/course/loginas.php?id=$course->id&sesskey=".sesskey()."\">$fullname</a>] ";
} else {
$realuserinfo = '';
}
$loginurl = get_login_url();
if (empty($course->id)) {
// $course->id is not defined during installation
return '';
} else if (isloggedin()) {
$context = get_context_instance(CONTEXT_COURSE, $course->id);
$fullname = fullname($USER, true);
// Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
$username = "<a href=\"$CFG->wwwroot/user/profile.php?id=$USER->id\">$fullname</a>";
if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id'=>$USER->mnethostid))) {
$username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
}
if (isguestuser()) {
$loggedinas = $realuserinfo.get_string('loggedinasguest');
if (!$loginapge) {
$loggedinas .= " (<a href=\"$loginurl\">".get_string('login').'</a>)';
}
} else if (is_role_switched($course->id)) { // Has switched roles
$rolename = '';
if ($role = $DB->get_record('role', array('id'=>$USER->access['rsw'][$context->path]))) {
$rolename = ': '.format_string($role->name);
}
$loggedinas = get_string('loggedinas', 'moodle', $username).$rolename.
" (<a href=\"$CFG->wwwroot/course/view.php?id=$course->id&switchrole=0&sesskey=".sesskey()."\">".get_string('switchrolereturn').'</a>)';
} else {
$loggedinas = $realuserinfo.get_string('loggedinas', 'moodle', $username).' '.
" (<a href=\"$CFG->wwwroot/login/logout.php?sesskey=".sesskey()."\">".get_string('logout').'</a>)';
}
} else {
$loggedinas = get_string('loggedinnot', 'moodle');
if (!$loginapge) {
$loggedinas .= " (<a href=\"$loginurl\">".get_string('login').'</a>)';
}
}
$loggedinas = '<div class="logininfo">'.$loggedinas.'</div>';
if (isset($SESSION->justloggedin)) {
unset($SESSION->justloggedin);
if (!empty($CFG->displayloginfailures)) {
if (!isguestuser()) {
if ($count = count_login_failures($CFG->displayloginfailures, $USER->username, $USER->lastlogin)) {
$loggedinas .= ' <div class="loginfailures">';
if (empty($count->accounts)) {
$loggedinas .= get_string('failedloginattempts', '', $count);
} else {
$loggedinas .= get_string('failedloginattemptsall', '', $count);
}
if (file_exists("$CFG->dirroot/report/log/index.php") and has_capability('report/log:view', get_context_instance(CONTEXT_SYSTEM))) {
$loggedinas .= ' (<a href="'.$CFG->wwwroot.'/report/log/index.php'.
'?chooselog=1&id=1&modid=site_errors">'.get_string('logs').'</a>)';
}
$loggedinas .= '</div>';
}
}
}
}
return $loggedinas;
}
/**
* Return the 'back' link that normally appears in the footer.
* @return string HTML fragment.
*/
public function home_link() {
global $CFG, $SITE;
if ($this->page->pagetype == 'site-index') {
// Special case for site home page - please do not remove
return '<div class="sitelink">' .
'<a title="Moodle" href="http://moodle.org/">' .
'<img style="width:100px;height:30px" src="' . $this->pix_url('moodlelogo') . '" alt="moodlelogo" /></a></div>';
} else if (!empty($CFG->target_release) && $CFG->target_release != $CFG->release) {
// Special case for during install/upgrade.
return '<div class="sitelink">'.
'<a title="Moodle" href="http://docs.moodle.org/en/Administrator_documentation" onclick="this.target=\'_blank\'">' .
'<img style="width:100px;height:30px" src="' . $this->pix_url('moodlelogo') . '" alt="moodlelogo" /></a></div>';
} else if ($this->page->course->id == $SITE->id || strpos($this->page->pagetype, 'course-view') === 0) {
return '<div class="homelink"><a href="' . $CFG->wwwroot . '/">' .
get_string('home') . '</a></div>';
} else {
return '<div class="homelink"><a href="' . $CFG->wwwroot . '/course/view.php?id=' . $this->page->course->id . '">' .
format_string($this->page->course->shortname, true, array('context' => $this->page->context)) . '</a></div>';
}
}
/**
* Redirects the user by any means possible given the current state
*
* This function should not be called directly, it should always be called using
* the redirect function in lib/weblib.php
*
* The redirect function should really only be called before page output has started
* however it will allow itself to be called during the state STATE_IN_BODY
*
* @param string $encodedurl The URL to send to encoded if required
* @param string $message The message to display to the user if any
* @param int $delay The delay before redirecting a user, if $message has been
* set this is a requirement and defaults to 3, set to 0 no delay
* @param boolean $debugdisableredirect this redirect has been disabled for
* debugging purposes. Display a message that explains, and don't
* trigger the redirect.
* @return string The HTML to display to the user before dying, may contain
* meta refresh, javascript refresh, and may have set header redirects
*/
public function redirect_message($encodedurl, $message, $delay, $debugdisableredirect) {
global $CFG;
$url = str_replace('&', '&', $encodedurl);
switch ($this->page->state) {
case moodle_page::STATE_BEFORE_HEADER :
// No output yet it is safe to delivery the full arsenal of redirect methods
if (!$debugdisableredirect) {
// Don't use exactly the same time here, it can cause problems when both redirects fire at the same time.
$this->metarefreshtag = '<meta http-equiv="refresh" content="'. $delay .'; url='. $encodedurl .'" />'."\n";
$this->page->requires->js_function_call('document.location.replace', array($url), false, ($delay + 3));
}
$output = $this->header();
break;
case moodle_page::STATE_PRINTING_HEADER :
// We should hopefully never get here
throw new coding_exception('You cannot redirect while printing the page header');
break;
case moodle_page::STATE_IN_BODY :
// We really shouldn't be here but we can deal with this
debugging("You should really redirect before you start page output");
if (!$debugdisableredirect) {
$this->page->requires->js_function_call('document.location.replace', array($url), false, $delay);
}
$output = $this->opencontainers->pop_all_but_last();
break;
case moodle_page::STATE_DONE :
// Too late to be calling redirect now
throw new coding_exception('You cannot redirect after the entire page has been generated');
break;
}
$output .= $this->notification($message, 'redirectmessage');
$output .= '<div class="continuebutton">(<a href="'. $encodedurl .'">'. get_string('continue') .'</a>)</div>';
if ($debugdisableredirect) {
$output .= '<p><strong>Error output, so disabling automatic redirect.</strong></p>';
}
$output .= $this->footer();
return $output;
}
/**
* Start output by sending the HTTP headers, and printing the HTML <head>
* and the start of the <body>.
*
* To control what is printed, you should set properties on $PAGE. If you
* are familiar with the old {@link print_header()} function from Moodle 1.9
* you will find that there are properties on $PAGE that correspond to most
* of the old parameters to could be passed to print_header.
*
* Not that, in due course, the remaining $navigation, $menu parameters here
* will be replaced by more properties of $PAGE, but that is still to do.
*
* @return string HTML that you must output this, preferably immediately.
*/
public function header() {
global $USER, $CFG;
if (session_is_loggedinas()) {
$this->page->add_body_class('userloggedinas');
}
$this->page->set_state(moodle_page::STATE_PRINTING_HEADER);
// Find the appropriate page layout file, based on $this->page->pagelayout.
$layoutfile = $this->page->theme->layout_file($this->page->pagelayout);
// Render the layout using the layout file.
$rendered = $this->render_page_layout($layoutfile);
// Slice the rendered output into header and footer.
$cutpos = strpos($rendered, $this->unique_main_content_token);
if ($cutpos === false) {
$cutpos = strpos($rendered, self::MAIN_CONTENT_TOKEN);
$token = self::MAIN_CONTENT_TOKEN;
} else {
$token = $this->unique_main_content_token;
}
if ($cutpos === false) {
throw new coding_exception('page layout file ' . $layoutfile . ' does not contain the main content placeholder, please include "<?php echo $OUTPUT->main_content() ?>" in theme layout file.');
}
$header = substr($rendered, 0, $cutpos);
$footer = substr($rendered, $cutpos + strlen($token));
if (empty($this->contenttype)) {
debugging('The page layout file did not call $OUTPUT->doctype()');
$header = $this->doctype() . $header;
}
send_headers($this->contenttype, $this->page->cacheable);
$this->opencontainers->push('header/footer', $footer);
$this->page->set_state(moodle_page::STATE_IN_BODY);
return $header . $this->skip_link_target('maincontent');
}
/**
* Renders and outputs the page layout file.
* @param string $layoutfile The name of the layout file
* @return string HTML code
*/
protected function render_page_layout($layoutfile) {
global $CFG, $SITE, $USER;
// The next lines are a bit tricky. The point is, here we are in a method
// of a renderer class, and this object may, or may not, be the same as
// the global $OUTPUT object. When rendering the page layout file, we want to use
// this object. However, people writing Moodle code expect the current
// renderer to be called $OUTPUT, not $this, so define a variable called
// $OUTPUT pointing at $this. The same comment applies to $PAGE and $COURSE.
$OUTPUT = $this;
$PAGE = $this->page;
$COURSE = $this->page->course;
ob_start();
include($layoutfile);
$rendered = ob_get_contents();
ob_end_clean();
return $rendered;
}
/**
* Outputs the page's footer
* @return string HTML fragment
*/
public function footer() {
global $CFG, $DB;
$output = $this->container_end_all(true);
$footer = $this->opencontainers->pop('header/footer');
if (debugging() and $DB and $DB->is_transaction_started()) {
// TODO: MDL-20625 print warning - transaction will be rolled back
}
// Provide some performance info if required
$performanceinfo = '';
if (defined('MDL_PERF') || (!empty($CFG->perfdebug) and $CFG->perfdebug > 7)) {
$perf = get_performance_info();
if (defined('MDL_PERFTOLOG') && !function_exists('register_shutdown_function')) {
error_log("PERF: " . $perf['txt']);
}
if (defined('MDL_PERFTOFOOT') || debugging() || $CFG->perfdebug > 7) {
$performanceinfo = $perf['html'];
}
}
$footer = str_replace($this->unique_performance_info_token, $performanceinfo, $footer);
$footer = str_replace($this->unique_end_html_token, $this->page->requires->get_end_code(), $footer);
$this->page->set_state(moodle_page::STATE_DONE);
return $output . $footer;
}
/**
* Close all but the last open container. This is useful in places like error
* handling, where you want to close all the open containers (apart from <body>)
* before outputting the error message.
* @param bool $shouldbenone assert that the stack should be empty now - causes a
* developer debug warning if it isn't.
* @return string the HTML required to close any open containers inside <body>.
*/
public function container_end_all($shouldbenone = false) {
return $this->opencontainers->pop_all_but_last($shouldbenone);
}
/**
* Returns lang menu or '', this method also checks forcing of languages in courses.
* @return string
*/
public function lang_menu() {
global $CFG;
if (empty($CFG->langmenu)) {
return '';
}
if ($this->page->course != SITEID and !empty($this->page->course->lang)) {
// do not show lang menu if language forced
return '';
}
$currlang = current_language();
$langs = get_string_manager()->get_list_of_translations();
if (count($langs) < 2) {
return '';
}
$s = new single_select($this->page->url, 'lang', $langs, $currlang, null);
$s->label = get_accesshide(get_string('language'));
$s->class = 'langmenu';
return $this->render($s);
}
/**
* Output the row of editing icons for a block, as defined by the controls array.
* @param array $controls an array like {@link block_contents::$controls}.
* @return HTML fragment.
*/
public function block_controls($controls) {
if (empty($controls)) {
return '';
}
$controlshtml = array();
foreach ($controls as $control) {
$controlshtml[] = html_writer::tag('a',
html_writer::empty_tag('img', array('src' => $this->pix_url($control['icon'])->out(false), 'alt' => $control['caption'])),
array('class' => 'icon','title' => $control['caption'], 'href' => $control['url']));
}
return html_writer::tag('div', implode('', $controlshtml), array('class' => 'commands'));
}
/**
* Prints a nice side block with an optional header.
*
* The content is described
* by a {@link block_contents} object.
*
* <div id="inst{$instanceid}" class="block_{$blockname} block">
* <div class="header"></div>
* <div class="content">
* ...CONTENT...
* <div class="footer">
* </div>
* </div>
* <div class="annotation">
* </div>
* </div>
*
* @param block_contents $bc HTML for the content
* @param string $region the region the block is appearing in.
* @return string the HTML to be output.
*/
function block(block_contents $bc, $region) {
$bc = clone($bc); // Avoid messing up the object passed in.
if (empty($bc->blockinstanceid) || !strip_tags($bc->title)) {
$bc->collapsible = block_contents::NOT_HIDEABLE;
}
if ($bc->collapsible == block_contents::HIDDEN) {
$bc->add_class('hidden');
}
if (!empty($bc->controls)) {
$bc->add_class('block_with_controls');
}
$skiptitle = strip_tags($bc->title);
if (empty($skiptitle)) {
$output = '';
$skipdest = '';
} else {
$output = html_writer::tag('a', get_string('skipa', 'access', $skiptitle), array('href' => '#sb-' . $bc->skipid, 'class' => 'skip-block'));
$skipdest = html_writer::tag('span', '', array('id' => 'sb-' . $bc->skipid, 'class' => 'skip-block-to'));
}
$output .= html_writer::start_tag('div', $bc->attributes);
$output .= $this->block_header($bc);
$output .= $this->block_content($bc);
$output .= html_writer::end_tag('div');
$output .= $this->block_annotation($bc);
$output .= $skipdest;
$this->init_block_hider_js($bc);
return $output;
}
/**
* Produces a header for a block
*
* @param block_contents $bc
* @return string
*/
protected function block_header(block_contents $bc) {
$title = '';
if ($bc->title) {
$title = html_writer::tag('h2', $bc->title, null);
}
$controlshtml = $this->block_controls($bc->controls);
$output = '';
if ($title || $controlshtml) {
$output .= html_writer::tag('div', html_writer::tag('div', html_writer::tag('div', '', array('class'=>'block_action')). $title . $controlshtml, array('class' => 'title')), array('class' => 'header'));
}
return $output;
}
/**
* Produces the content area for a block
*
* @param block_contents $bc
* @return string
*/
protected function block_content(block_contents $bc) {
$output = html_writer::start_tag('div', array('class' => 'content'));
if (!$bc->title && !$this->block_controls($bc->controls)) {
$output .= html_writer::tag('div', '', array('class'=>'block_action notitle'));
}
$output .= $bc->content;
$output .= $this->block_footer($bc);
$output .= html_writer::end_tag('div');
return $output;
}
/**
* Produces the footer for a block
*
* @param block_contents $bc
* @return string
*/
protected function block_footer(block_contents $bc) {
$output = '';
if ($bc->footer) {
$output .= html_writer::tag('div', $bc->footer, array('class' => 'footer'));
}
return $output;
}
/**
* Produces the annotation for a block
*
* @param block_contents $bc
* @return string
*/
protected function block_annotation(block_contents $bc) {
$output = '';
if ($bc->annotation) {
$output .= html_writer::tag('div', $bc->annotation, array('class' => 'blockannotation'));
}
return $output;
}
/**
* Calls the JS require function to hide a block.
* @param block_contents $bc A block_contents object
* @return void
*/
protected function init_block_hider_js(block_contents $bc) {
if (!empty($bc->attributes['id']) and $bc->collapsible != block_contents::NOT_HIDEABLE) {
$config = new stdClass;
$config->id = $bc->attributes['id'];
$config->title = strip_tags($bc->title);
$config->preference = 'block' . $bc->blockinstanceid . 'hidden';
$config->tooltipVisible = get_string('hideblocka', 'access', $config->title);
$config->tooltipHidden = get_string('showblocka', 'access', $config->title);
$this->page->requires->js_init_call('M.util.init_block_hider', array($config));
user_preference_allow_ajax_update($config->preference, PARAM_BOOL);
}
}
/**
* Render the contents of a block_list.
* @param array $icons the icon for each item.
* @param array $items the content of each item.
* @return string HTML
*/
public function list_block_contents($icons, $items) {
$row = 0;
$lis = array();
foreach ($items as $key => $string) {
$item = html_writer::start_tag('li', array('class' => 'r' . $row));
if (!empty($icons[$key])) { //test if the content has an assigned icon
$item .= html_writer::tag('div', $icons[$key], array('class' => 'icon column c0'));
}
$item .= html_writer::tag('div', $string, array('class' => 'column c1'));
$item .= html_writer::end_tag('li');
$lis[] = $item;
$row = 1 - $row; // Flip even/odd.
}
return html_writer::tag('ul', implode("\n", $lis), array('class' => 'unlist'));
}
/**
* Output all the blocks in a particular region.
* @param string $region the name of a region on this page.
* @return string the HTML to be output.
*/
public function blocks_for_region($region) {
$blockcontents = $this->page->blocks->get_content_for_region($region, $this);
$output = '';
foreach ($blockcontents as $bc) {
if ($bc instanceof block_contents) {
$output .= $this->block($bc, $region);
} else if ($bc instanceof block_move_target) {
$output .= $this->block_move_target($bc);
} else {
throw new coding_exception('Unexpected type of thing (' . get_class($bc) . ') found in list of block contents.');
}
}
return $output;
}
/**
* Output a place where the block that is currently being moved can be dropped.
* @param block_move_target $target with the necessary details.
* @return string the HTML to be output.
*/
public function block_move_target($target) {
return html_writer::tag('a', html_writer::tag('span', $target->text, array('class' => 'accesshide')), array('href' => $target->url, 'class' => 'blockmovetarget'));
}
/**
* Renders a special html link with attached action
*
* @param string|moodle_url $url
* @param string $text HTML fragment
* @param component_action $action
* @param array $attributes associative array of html link attributes + disabled
* @return HTML fragment
*/
public function action_link($url, $text, component_action $action = null, array $attributes=null) {
if (!($url instanceof moodle_url)) {
$url = new moodle_url($url);
}
$link = new action_link($url, $text, $action, $attributes);
return $this->render($link);
}
/**
* Implementation of action_link rendering