Adding PageMenuItem for chat

file/lib/system/menu/page/ChatPageMenuItemProvider.class.php

@@ -0,0 +1,28 @@
+<?php
+namespace wcf\system\menu\page;
+
+/**
+ * PageMenuItemProvider for chat.
+ *
+ * @author 	Tim Düsterhus
+ * @copyright	2010-2011 Tim Düsterhus
+ * @license	Creative Commons Attribution-NonCommercial-ShareAlike <http://creativecommons.org/licenses/by-nc-sa/3.0/legalcode>
+ * @package	timwolla.wcf.chat
+ * @subpackage	system.menu.page
+ */
+class ChatPageMenuItemProvider extends DefaultPageMenuItemProvider {
+	/**
+	 * Hides the button when there is no valid room
+	 *
+	 * @see wcf\system\menu\page\PageMenuItemProvider::isVisible()
+	 */
+	public function isVisible() {
+		try {
+			\wcf\data\chat\room\ChatRoom::getCache()->seek(0);
+			return true;
+		}
+		catch (\OutOfBoundsException $e) {
+			return false;
+		}
+	}
+}

pagemenu.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<data xmlns="http://www.woltlab.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.woltlab.com http://www.woltlab.com/XSD/pagemnu.xsd">
+	<import>
+		<pagemenuitem name="wcf.header.menu.chat">
+			<link>index.php/Chat</link>
+			<position>header</position>
+			<classname>wcf\system\menu\page\ChatPageMenuItemProvider</classname>
+		</pagemenuitem>
+	</import>
+</data>