From 8e5c23e04ff278fa6addec308add60db65ff5ba1 Mon Sep 17 00:00:00 2001
From: Sam Hemelryk <sam@moodle.com>
Date: Wed, 5 Jan 2011 13:27:59 +0800
Subject: [PATCH] blocks-navigation MDL-25596 Fixed up redundant AJAX calls
 when navigation was limited by config

---
 blocks/navigation/block_navigation.php        |  8 +++++++-
 blocks/navigation/renderer.php                | 14 +++++++++----
 .../navigation/yui/navigation/navigation.js   | 20 +++++++++++++++++++
 3 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/blocks/navigation/block_navigation.php b/blocks/navigation/block_navigation.php
index c7321f70587..c51efa8965f 100644
--- a/blocks/navigation/block_navigation.php
+++ b/blocks/navigation/block_navigation.php
@@ -107,7 +107,13 @@ class block_navigation extends block_base {
         if (!empty($CFG->navcourselimit)) {
             $limit = $CFG->navcourselimit;
         }
-        $arguments = array('id'=>$this->instance->id, 'instance'=>$this->instance->id, 'candock'=>$this->instance_can_be_docked(), 'courselimit'=>$limit);
+        $arguments = array(
+            'id'             => $this->instance->id,
+            'instance'       => $this->instance->id,
+            'candock'        => $this->instance_can_be_docked(),
+            'courselimit'    => $limit,
+            'expansionlimit' => $this->config->expansionlimit
+        );
         $this->page->requires->yui_module(array('core_dock', 'moodle-block_navigation-navigation'), 'M.block_navigation.init_add_tree', array($arguments));
     }
 
diff --git a/blocks/navigation/renderer.php b/blocks/navigation/renderer.php
index 6ef43a40df6..d59f87c06a1 100644
--- a/blocks/navigation/renderer.php
+++ b/blocks/navigation/renderer.php
@@ -21,13 +21,16 @@ class block_navigation_renderer extends plugin_renderer_base {
         // array of nested li elements
         $lis = array();
         foreach ($items as $item) {
-            if (!$item->display) {
+            if (!$item->display && !$item->contains_active_node()) {
                 continue;
             }
             $content = $item->get_content();
             $title = $item->get_title();
-            $isbranch = ($item->type !== $expansionlimit && ($item->children->count() > 0 || ($item->nodetype == navigation_node::NODETYPE_BRANCH && $item->children->count()==0 && (isloggedin() || $item->type <= navigation_node::TYPE_CATEGORY))));
-            $hasicon = ((!$isbranch || $item->type == navigation_node::TYPE_ACTIVITY)&& $item->icon instanceof renderable);
+
+            $isexpandable = (empty($expansionlimit) || ($item->type > navigation_node::TYPE_ACTIVITY || $item->type < $expansionlimit) || ($item->contains_active_node() && $item->children->count() > 0));
+            $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->icon instanceof renderable);
 
             if ($hasicon) {
                 $icon = $this->output->render($item->icon);
@@ -91,7 +94,10 @@ class block_navigation_renderer extends plugin_renderer_base {
             if (!empty($item->id)) {
                 $divattr['id'] = $item->id;
             }
-            $content = html_writer::tag('p', $content, $divattr) . $this->navigation_node($item->children, array(), $expansionlimit, $options, $depth+1);
+            $content = html_writer::tag('p', $content, $divattr);
+            if ($isexpandable) {
+                $content .= $this->navigation_node($item->children, array(), $expansionlimit, $options, $depth+1);
+            }
             if (!empty($item->preceedwithhr) && $item->preceedwithhr===true) {
                 $content = html_writer::empty_tag('hr') . $content;
             }
diff --git a/blocks/navigation/yui/navigation/navigation.js b/blocks/navigation/yui/navigation/navigation.js
index d35d8d7b564..f2522d89a30 100644
--- a/blocks/navigation/yui/navigation/navigation.js
+++ b/blocks/navigation/yui/navigation/navigation.js
@@ -1,5 +1,11 @@
 YUI.add('moodle-block_navigation-navigation', function(Y){
 
+var EXPANSIONLIMIT_EVERYTHING = 0,
+    EXPANSIONLIMIT_COURSE     = 20,
+    EXPANSIONLIMIT_SECTION    = 30,
+    EXPANSIONLIMIT_ACTIVITY   = 40;
+
+
 /**
  * Navigation tree class.
  *
@@ -119,6 +125,12 @@ Y.extend(TREE, Y.Base, TREE.prototype, {
         accordian : {
             validator : Y.Lang.isBool,
             value : false
+        },
+        expansionlimit : {
+            value : 0,
+            setter : function(val) {
+                return parseInt(val);
+            }
         }
     }
 });
@@ -161,7 +173,15 @@ BRANCH.prototype = {
                 this.set(i, config.overrides[i]);
             }
         }
+        // Get the node for this branch
         this.node = Y.one('#', this.get('id'));
+        // Now check whether the branch is not expandable because of the expansionlimit
+        var expansionlimit = this.get('tree').get('expansionlimit');
+        var type = this.get('type');
+        if (expansionlimit != EXPANSIONLIMIT_EVERYTHING &&  type >= expansionlimit && type <= EXPANSIONLIMIT_ACTIVITY) {
+            this.set('expandable', false);
+            this.set('haschildren', false);
+        }
     },
     /**
      * Draws the branch within the tree.
-- 
2.17.1