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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/>.
/**
* Outputs the navigation tree.
*
* @since Moodle 2.0
* @package block_navigation
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
/**
* Renderer for block navigation
*
* @package block_navigation
* @category navigation
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class block_navigation_renderer extends plugin_renderer_base {
/**
* Returns the content of the navigation tree.
*
* @param global_navigation $navigation
* @param int $expansionlimit
* @param array $options
* @return string $content
*/
public function navigation_tree(global_navigation $navigation, $expansionlimit, array $options = array()) {
$navigation->add_class('navigation_node');
$navigationattrs = array(
'class' => 'block_tree list',
'role' => 'tree',
'data-ajax-loader' => 'block_navigation/nav_loader');
$content = $this->navigation_node(array($navigation), $navigationattrs, $expansionlimit, $options);
if (isset($navigation->id) && !is_numeric($navigation->id) && !empty($content)) {
$content = $this->output->box($content, 'block_tree_box', $navigation->id);
}
return $content;
}
/**
* Produces a navigation node for the navigation tree
*
* @param navigation_node[] $items
* @param array $attrs
* @param int $expansionlimit
* @param array $options
* @param int $depth
* @return string
*/
protected function navigation_node($items, $attrs=array(), $expansionlimit=null, array $options = array(), $depth=1) {
// Exit if empty, we don't want an empty ul element.
if (count($items) === 0) {
return '';
}
// Turn our navigation items into list items.
$lis = array();
// Set the number to be static for unique id's.
static $number = 0;
foreach ($items as $item) {
$number++;
if (!$item->display && !$item->contains_active_node()) {
continue;
}
$isexpandable = (empty($expansionlimit) || ($item->type > navigation_node::TYPE_ACTIVITY || $item->type < $expansionlimit) || ($item->contains_active_node() && $item->children->count() > 0));
// Skip elements which have no content and no action - no point in showing them
if (!$isexpandable && empty($item->action)) {
continue;
}
$id = $item->id ? $item->id : html_writer::random_id();
$content = $item->get_content();
$title = $item->get_title();
$ulattr = ['id' => $id . '_group', 'role' => 'group'];
$liattr = ['class' => [$item->get_css_type(), 'depth_'.$depth]];
$pattr = ['class' => ['tree_item'], 'role' => 'treeitem'];
$pattr += !empty($item->id) ? ['id' => $item->id] : [];
$isbranch = $isexpandable && ($item->children->count() > 0 || ($item->has_children() && (isloggedin() || $item->type <= navigation_node::TYPE_CATEGORY)));
$hasicon = ((!$isbranch || $item->type == navigation_node::TYPE_ACTIVITY || $item->type == navigation_node::TYPE_RESOURCE) && $item->icon instanceof renderable);
$icon = '';
if ($hasicon) {
$liattr['class'][] = 'item_with_icon';
$pattr['class'][] = 'hasicon';
$icon = $this->output->render($item->icon);
// Because an icon is being used we're going to wrap the actual content in a span.
// This will allow designers to create columns for the content, as we've done in styles.css.
$content = $icon . html_writer::span($content, 'item-content-wrap');
}
if ($item->helpbutton !== null) {
$content = trim($item->helpbutton).html_writer::tag('span', $content, array('class'=>'clearhelpbutton'));
}
if (empty($content)) {
continue;
}
$nodetextid = 'label_' . $depth . '_' . $number;
$attributes = array('tabindex' => '-1', 'id' => $nodetextid);
if ($title !== '') {
$attributes['title'] = $title;
}
if ($item->hidden) {
$attributes['class'] = 'dimmed_text';
}
if (is_string($item->action) || empty($item->action) ||
(($item->type === navigation_node::TYPE_CATEGORY || $item->type === navigation_node::TYPE_MY_CATEGORY) &&
empty($options['linkcategories']))) {
$content = html_writer::tag('span', $content, $attributes);
} else if ($item->action instanceof action_link) {
//TODO: to be replaced with something else
$link = $item->action;
$link->text = $icon.html_writer::span($link->text, 'item-content-wrap');
$link->attributes = array_merge($link->attributes, $attributes);
$content = $this->output->render($link);
} else if ($item->action instanceof moodle_url) {
$content = html_writer::link($item->action, $content, $attributes);
}
if ($isbranch) {
$pattr['class'][] = 'branch';
$liattr['class'][] = 'contains_branch';
$pattr += ['aria-expanded' => ($item->has_children() && (!$item->forceopen || $item->collapse)) ? "false" : "true"];
if ($item->requiresajaxloading) {
$pattr += [
'data-requires-ajax' => 'true',
'data-loaded' => 'false',
'data-node-id' => $item->id,
'data-node-key' => $item->key,
'data-node-type' => $item->type
];
} else {
$pattr += ['aria-owns' => $id . '_group'];
}
}
if ($item->isactive === true) {
$liattr['class'][] = 'current_branch';
}
if (!empty($item->classes) && count($item->classes)>0) {
$pattr['class'] = array_merge($pattr['class'], $item->classes);
}
$liattr['class'] = join(' ', $liattr['class']);
$pattr['class'] = join(' ', $pattr['class']);
$pattr += $depth == 1 ? ['data-collapsible' => 'false'] : [];
if (isset($pattr['aria-expanded']) && $pattr['aria-expanded'] === 'false') {
$ulattr += ['aria-hidden' => 'true'];
}
// Create the structure.
$content = html_writer::tag('p', $content, $pattr);
if ($isexpandable) {
$content .= $this->navigation_node($item->children, $ulattr, $expansionlimit, $options, $depth + 1);
}
if (!empty($item->preceedwithhr) && $item->preceedwithhr===true) {
$content = html_writer::empty_tag('hr') . $content;
}
$liattr['aria-labelledby'] = $nodetextid;
$content = html_writer::tag('li', $content, $liattr);
$lis[] = $content;
}
if (count($lis) === 0) {
// There is still a chance, despite having items, that nothing had content and no list items were created.
return '';
}
// We used to separate using new lines, however we don't do that now, instead we'll save a few chars.
// The source is complex already anyway.
return html_writer::tag('ul', implode('', $lis), $attrs);
}
}