pulled navigation functions out of elgglib.php

git-svn-id: http://code.elgg.org/elgg/trunk@7136 36083f99-b078-4883-b0ff-0f9b5a30f544

1 files changed, 502 insertions, 0 deletions

diff --git a/engine/lib/navigation.php b/engine/lib/navigation.php
new file mode 100644
index 000000000..a5b087bd8
--- /dev/null
+++ b/engine/lib/navigation.php
@@ -0,0 +1,502 @@
+<?php
+/**
+ * Elgg navigation library
+ * Functions for managing menus and other navigational elements
+ *
+ * @package Elgg.Core
+ * @subpackage Navigation
+ */
+
+/**
+ * Deprecated by elgg_add_submenu_item()
+ *
+ * @see elgg_add_submenu_item()
+ * @deprecated 1.8
+ *
+ * @param string  $label    The label
+ * @param string  $link     The link
+ * @param string  $group    The group to store item in
+ * @param boolean $onclick  Add a confirmation when clicked?
+ * @param boolean $selected Is menu item selected
+ *
+ * @return bool
+ */
+function add_submenu_item($label, $link, $group = 'default', $onclick = false, $selected = NULL) {
+	elgg_deprecated_notice('add_submenu_item was deprecated by elgg_add_submenu_item', 1.8);
+
+	$item = array(
+		'text' => $label,
+		'href' => $link,
+		'selected' => $selected
+	);
+
+	if (!$group) {
+		$group = 'default';
+	}
+
+	if ($onclick) {
+		$js = "onclick=\"javascript:return confirm('" . elgg_echo('deleteconfirm') . "')\"";
+		$item['vars'] = array('js' => $js);
+	}
+	// submenu items were added in the page setup hook usually by checking
+	// the context.  We'll pass in the current context here, which will
+	// emulate that effect.
+	// if context == 'main' (default) it probably means they always wanted
+	// the menu item to show up everywhere.
+	$context = get_context();
+
+	if ($context == 'main') {
+		$context = 'all';
+	}
+	return elgg_add_submenu_item($item, $context, $group);
+}
+
+/**
+ * Add an entry to the submenu.
+ *
+ * @param array  $item    The item as:
+ * <code>
+ * array(
+ * 	'title' => 'Text to display',
+ * 	'url' => 'URL of the link',
+ * 	'id' => 'entry_unique_id' //used by children items to identify parents
+ * 	'parent_id' => 'id_of_parent',
+ * 	'selected' => BOOL // Is this item selected? (If NULL or unset will attempt to guess)
+ * 	'vars' => array() // Array of vars to pass to the navigation/submenu_item view
+ * )
+ * </code>
+ *
+ * @param string $context Context in which to display this menu item.  'all'
+ *                        will make it show up all the time. Use sparingly.
+ * @param string $group   Group for the item. Each submenu group has its own <ul>
+ *
+ * @return BOOL
+ * @since 1.8
+ * @see elgg_prepare_submenu
+ */
+function elgg_add_submenu_item(array $item, $context = 'all', $group = 'default') {
+	global $CONFIG;
+
+	if (!isset($CONFIG->submenu_items)) {
+		$CONFIG->submenu_items = array();
+	}
+
+	if (!isset($CONFIG->submenu_items[$context])) {
+		$CONFIG->submenu_items[$context] = array();
+	}
+
+	if (!isset($CONFIG->submenu_items[$context][$group])) {
+		$CONFIG->submenu_items[$context][$group] = array();
+	}
+
+	if (!isset($item['text'])) {
+		return FALSE;
+	}
+
+	// we use persistent object properties in the submenu
+	// setup function, so normalize the array to an object.
+	// we pass it in as an array because this would be the only
+	// place in elgg that we ask for an object like this.
+	// consistency ftw.
+	$item_obj = new StdClass();
+
+	foreach ($item as $k => $v) {
+		switch ($k) {
+			case 'parent_id':
+			case 'id':
+				// make sure '' and false make sense
+				$v = (empty($v)) ? NULL : $v;
+
+			default:
+				$item_obj->$k = $v;
+				break;
+		}
+	}
+
+	$CONFIG->submenu_items[$context][$group][] = $item_obj;
+
+	return TRUE;
+}
+
+/**
+ * Properly nest all submenu entries for contexts $context and 'all'
+ *
+ * @param string $context Context for menus
+ * @param bool   $sort    Sort the menu items alphabetically
+ *
+ * @since 1.8
+ * @see elgg_add_submenu_item
+ *
+ * @return true
+ */
+function elgg_prepare_submenu($context = 'main', $sort = FALSE) {
+	global $CONFIG;
+
+	if (!isset($CONFIG->submenu_items) || !($CONFIG->submenu_items)) {
+		return FALSE;
+	}
+
+	$groups = array();
+
+	if (isset($CONFIG->submenu_items['all'])) {
+		$groups = $CONFIG->submenu_items['all'];
+	}
+
+	if (isset($CONFIG->submenu_items[$context])) {
+		$groups = array_merge_recursive($groups, $CONFIG->submenu_items[$context]);
+	}
+
+	if (!$groups) {
+		return FALSE;
+	}
+
+	foreach ($groups as $group => $items) {
+		if ($sort) {
+			usort($items, 'elgg_submenu_item_cmp');
+		}
+
+		$parsed_menu = array();
+		// determin which children need to go in this item.
+		foreach ($items as $i => $item) {
+			// can only support children if there's an id
+			if (isset($item->id)) {
+				foreach ($items as $child_i => $child_item) {
+					// don't check ourselves or used children.
+					if ($child_i == $i || $child_item->used == TRUE) {
+						continue;
+					}
+
+					if (isset($child_item->parent_id) && $child_item->parent_id == $item->id) {
+						if (!isset($item->children)) {
+							$item->children = array();
+						}
+						$item->children[] = $child_item;
+						$child_item->parent = $item;
+						// don't unset because we still need to check this item for children
+						$child_item->used = TRUE;
+					}
+				}
+
+				// if the parent doesn't have a url, make it the first child item.
+				if (isset($item->children) && $item->children && !$item->href) {
+					$child = $item->children[0];
+					while ($child && !isset($child->href)) {
+						if (isset($child->children) && isset($child->children[0])) {
+							$child = $child->children[0];
+						} else {
+							$child = NULL;
+						}
+					}
+
+					if ($child && isset($child->href)) {
+						$item->href = $child->href;
+					} else {
+						// @todo There are no URLs anywhere in this tree.
+						$item->href = $CONFIG->url;
+					}
+				}
+			}
+
+			// only add top-level elements to the menu.
+			// the rest are children.
+			if (!isset($item->parent_id)) {
+				$parsed_menu[] = $item;
+			}
+		}
+
+		$CONFIG->submenu[$context][$group] = $parsed_menu;
+	}
+
+	return TRUE;
+}
+
+/**
+ * Helper function used to sort submenu items by their display text.
+ *
+ * @param object $a First object
+ * @param object $b Second object
+ *
+ * @return int
+ * @since 1.8
+ * @see elgg_prepare_submenu
+ */
+function elgg_submenu_item_cmp($a, $b) {
+	$a = $a->text;
+	$b = $b->text;
+
+	return strnatcmp($a, $b);
+}
+
+/**
+ * Use elgg_get_submenu().
+ *
+ * @see elgg_get_submenu()
+ * @deprecated 1.8
+ *
+ * @return string
+ */
+function get_submenu() {
+	elgg_deprecated_notice("get_submenu() has been deprecated by elgg_get_submenu()", 1.8);
+	return elgg_get_submenu();
+}
+
+/**
+ * Return the HTML for a sidemenu.
+ *
+ * @param string $context The context of the submenu (defaults to main)
+ * @param BOOL   $sort    Sort by display name?
+ *
+ * @return string Formatted HTML.
+ * @since 1.8
+ * @todo Rename to a view function. See {@trac #2320}.
+ */
+function elgg_get_submenu($context = NULL, $sort = FALSE) {
+	global $CONFIG;
+
+	if (!$context) {
+		$context = get_context();
+	}
+
+	if (!elgg_prepare_submenu($context, $sort)) {
+		return '';
+	}
+
+	$groups = $CONFIG->submenu[$context];
+	$submenu_html = '';
+
+	foreach ($groups as $group => $items) {
+		// how far down we are in children arrays
+		$depth = 0;
+		// push and pop parent items
+		$temp_items = array();
+
+		while ($item = current($items)) {
+			// ignore parents created by a child but parent never defined properly
+			if (!isset($item->text) || !($item->text)) {
+				next($items);
+				continue;
+			}
+
+			// try to guess if this should be selected if they don't specify
+			if ((!isset($item->selected) || $item->selected === NULL) && isset($item->href)) {
+				$item->selected = elgg_http_url_is_identical(full_url(), $item->href);
+			}
+
+			// traverse up the parent tree if matached to mark all parents as selected/expanded.
+			if ($item->selected && isset($item->parent)) {
+				$parent = $item->parent;
+				while ($parent) {
+					$parent->selected = TRUE;
+					if (isset($parent->parent)) {
+						$parent = $parent->parent;
+					} else {
+						$parent = NULL;
+					}
+				}
+			}
+
+			// get the next item
+			if (isset($item->children) && $item->children) {
+				$depth++;
+				array_push($temp_items, $items);
+				$items = $item->children;
+			} elseif ($depth > 0) {
+				// check if there are more children elements in the current items
+				// pop back up to the parent(s) if not
+				if ($item = next($items)) {
+					continue;
+				} else {
+					while ($depth > 0) {
+						$depth--;
+						$items = array_pop($temp_items);
+						if ($item = next($items)) {
+							break;
+						}
+					}
+				}
+			} else {
+				next($items);
+			}
+		}
+
+		$vars = array('group' => $group, 'items' => $items);
+		$submenu_html .= elgg_view('navigation/submenu_group', $vars);
+	}
+
+	// include the JS for the expand menus too
+	return elgg_view('navigation/submenu_js') . $submenu_html;
+}
+
+/**
+ * Registers any custom menu items with the main Site Menu.
+ *
+ * @note Custom menu items are added through the admin interface.  Plugins
+ * can add standard menu items by using {@link add_menu()}.
+ *
+ * @since 1.8
+ * @link http://docs.elgg.org/Tutorials/UI/SiteMenu
+ * @elgg_event_handler init system
+ * @return void
+ */
+function add_custom_menu_items() {
+	if ($custom_items = get_config('menu_items_custom_items')) {
+		foreach ($custom_items as $url => $name) {
+			add_menu($name, $url);
+		}
+	}
+}
+
+/**
+ * Returns the main site menu.
+ *
+ * @note The main site menu is split into "featured" links and
+ * "more" links.
+ *
+ * @return array ('featured_urls' and 'more')
+ * @since 1.8
+ * @link http://docs.elgg.org/Tutorials/UI/SiteMenu
+ */
+function elgg_get_nav_items() {
+	$menu_items = get_register('menu');
+	$featured_urls_info = get_config('menu_items_featured_urls');
+
+	$more = array();
+	$featured_urls = array();
+	$featured_urls_sanitised = array();
+
+	// easier to compare with in_array() than embedded foreach()es
+	$valid_urls = array();
+	foreach ($menu_items as $info) {
+		$valid_urls[] = $info->value->url;
+	}
+
+	// make sure the url is a valid link.
+	// this prevents disabled plugins leaving behind
+	// valid links when not using a pagehandler.
+	if ($featured_urls_info) {
+		foreach ($featured_urls_info as $info) {
+			if (in_array($info->value->url, $valid_urls)) {
+				$featured_urls[] = $info->value->url;
+				$featured_urls_sanitised[] = $info;
+			}
+		}
+	}
+
+	// add toolbar entries if not hiding dupes.
+	foreach ($menu_items as $name => $info) {
+		if (!in_array($info->value->url, $featured_urls)) {
+			$more[] = $info;
+		}
+	}
+
+	return array(
+		'featured' => $featured_urls_sanitised,
+		'more' => $more
+	);
+}
+
+/**
+ * Adds an item to the site-wide menu.
+ *
+ * You can obtain the menu array by calling {@link get_register('menu')}
+ *
+ * @param string $menu_name     The name of the menu item
+ * @param string $menu_url      The URL of the page
+ * @param array  $menu_children Optionally, an array of submenu items (not currently used)
+ * @param string $context       The context of the menu
+ *
+ * @return true|false Depending on success
+ * @todo Can be deprecated when the new menu system is introduced.
+ */
+function add_menu($menu_name, $menu_url, $menu_children = array(), $context = "") {
+	global $CONFIG;
+
+	if (!isset($CONFIG->menucontexts)) {
+		$CONFIG->menucontexts = array();
+	}
+
+	if (empty($context)) {
+		$context = get_plugin_name();
+	}
+
+	$value = new stdClass();
+	$value->url = $menu_url;
+	$value->context = $context;
+
+	$CONFIG->menucontexts[] = $context;
+	return add_to_register('menu', $menu_name, $value, $menu_children);
+}
+
+/**
+ * Removes an item from the menu register
+ *
+ * @param string $menu_name The name of the menu item
+ *
+ * @return true|false Depending on success
+ */
+function remove_menu($menu_name) {
+	return remove_from_register('menu', $menu_name);
+}
+
+/**
+ * Returns a menu item for use in the children section of add_menu()
+ * This is not currently used in the Elgg core.
+ *
+ * @param string $menu_name The name of the menu item
+ * @param string $menu_url  Its URL
+ *
+ * @return stdClass|false Depending on success
+ * @todo Can be deprecated when the new menu system is introduced.
+ */
+function menu_item($menu_name, $menu_url) {
+	elgg_deprecated_notice('menu_item() is deprecated by add_submenu_item', 1.7);
+	return make_register_object($menu_name, $menu_url);
+}
+
+/**
+ * Adds a breadcrumb to the breadcrumbs stack.
+ *
+ * @param string $title The title to display
+ * @param string $link  Optional. The link for the title.
+ *
+ * @return void
+ *
+ * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
+ */
+function elgg_push_breadcrumb($title, $link = NULL) {
+	global $CONFIG;
+	if (!is_array($CONFIG->breadcrumbs)) {
+		$CONFIG->breadcrumbs = array();
+	}
+
+	// avoid key collisions.
+	$CONFIG->breadcrumbs[] = array('title' => $title, 'link' => $link);
+}
+
+/**
+ * Removes last breadcrumb entry.
+ *
+ * @return array popped item.
+ * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
+ */
+function elgg_pop_breadcrumb() {
+	global $CONFIG;
+
+	if (is_array($CONFIG->breadcrumbs)) {
+		array_pop($CONFIG->breadcrumbs);
+	}
+
+	return FALSE;
+}
+
+/**
+ * Returns all breadcrumbs as an array of array('title' => 'Readable Title', 'link' => 'URL')
+ *
+ * @return array Breadcrumbs
+ * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
+ */
+function elgg_get_breadcrumbs() {
+	global $CONFIG;
+
+	return (is_array($CONFIG->breadcrumbs)) ? $CONFIG->breadcrumbs : array();
+}