来源:http://trac.seagullproject.org/wiki/Howto/Navigation/ModifyingCategoryMenu ======如何修改category菜单块====== =====结构===== Category菜单块中(例如:CategoryNav.php或ShopNav.php),你可以定义导航块的外观. 代码执行如下:


setStartId(0);
        $html = '
';
        $html .= $menu->toHtml();
        return $html;
    }
?>

目前通过为menu builder生成一个新的类,可以修改外观. 将block中的这行


"$menu = & new MenuBuilder('ExplorerBsd');"

修改成


"$menu = & new MenuBuilder('Example');"

接着,在102行中,将这个类添加到modules/navigation/classes/MenuBuilder.php中.


GUI->render($this->_startId);
            break;
?>

=====自定义Menu Builder===== 不要小看最后一步哦,你必须创建属于自己的菜单创建者类modules/navigation/classes/menu/Example.php,在这个类中你可以指定categories的外观:


conf = $conf;
    }

    function render($id = 0)
    {
        $menu = $this->getGuruTree($id);
        $html = $menu->printMenu();
        return $html;
    }

    function getGuruTree($id = 0)
    {
        SGL::logMessage(null, PEAR_LOG_DEBUG);

        //  style definition .treeMenuDefault in 
        $tree = &$this->createFromSQL($id);

        //  initialise the class options
        require_once 'HTML/TreeMenu.php';

        //  build url for current page
        $req = & SGL_Request::singleton();
        $url = SGL_Url::makeLink(   '',
                                    $req->get('managerName'),
                                    $req->get('moduleName')
                                    );
        $url .= 'frmCatID/';
        $nodeOptions = array(
         'text'          => '',
         'link'          => $url,
         'icon'          => 'exampleFolder.gif',
         'expandedIcon'  => 'exampleExpandedFolder.gif',
         'class'         => '',
         'expanded'      => false,
         'linkTarget'    => '_self',
         'isDynamic'     => 'true',
         'ensureVisible' => '',
         );
        $options = array(   'structure' => $tree,
                            'type' => 'heyes',
                            'nodeOptions' => $nodeOptions);

        $menu = HTML_TreeMenu::createFromStructure($options);

        require_once SGL_MOD_DIR . '/navigation/classes/HTML_TreeMenu_DHTML_SGL.php';
        $theme = $_SESSION['aPrefs']['theme'];
        $treeMenu = & new HTML_TreeMenu_DHTML_SGL($menu, array(
            'images' =>  SGL_BASE_URL . "/themes/$theme/images/imagesAlt2",
            'defaultClass'  => 'treeMenuDefault',
            'noTopLevelImages' => 'true',
            ));
        return $treeMenu;
    }

    /**
    * This method imports a tree from a database using the common
    * id/parent_id method of storing the structure.
    *

    */
    function &createFromSQL($id = 0)
    {
        SGL::logMessage(null, PEAR_LOG_DEBUG);

        require_once 'HTML/Tree.php';

        $dbh = &SGL_DB::singleton();
        $query = '  SELECT  category_id as id, parent_id, label AS text
                    FROM    ' . $this->conf['table']['category'] .'
                    ORDER BY parent_id, order_id';
        $tree     = &new Tree();
        $nodeList = array();

        // Perform query
        $result = $dbh->query($query);
        if (!PEAR::isError($result)) {
            while ($row = $result->fetchRow(DB_FETCHMODE_ASSOC)) {

                // Parent id is 0, thus root node.
                if (!$row['parent_id']) {
                    unset($row['parent_id']);
                    $nodeList[$row['id']] = &new Tree_Node($row);
                    $tree->nodes->addNode($nodeList[$row['id']]);

                // Parent node has already been added to tree
                } elseif (!empty($nodeList[$row['parent_id']])) {
                    $parentNode = &$nodeList[$row['parent_id']];
                    unset($row['parent_id']);
                    $nodeList[$row['id']] = &new Tree_Node($row);
                    $parentNode->nodes->addNode($nodeList[$row['id']]);

                } else {
                    // Orphan node ?
                }
            }
        } else SGL::raiseError('problem with getGuruTree query');

        // jump into the cat tree at a predefined depth
        // if $id = 0 return the hole tree OR if $id != 0 return from $id branch
        $result = ($id) ? $nodeList[$id] : $tree;
        return $result;
    }
}
?>

这些只是对ExplorerBSD menu builder做轻微的修改.当然你可以添加任何你想的东西. =====选项===== 当调用"$treeMenu = & new HTML_TreeMenu_DHTML_SGL();"时,你可以给这个类传递一些选项. * images - 图片文件夹的路径.默认是"images". * linkTarget - 链接的标签,默认是"_self" * defaultClass - 应用于一个结点的默认的CSS类,默认是执行的. * usePersistence - 是否使用客户端的延续.使用cookies来完成这个延续.默认是true. * noTopLevelImages - 如果有多个顶级分枝时,是否跳过显示第一级的图片.还有一个布尔值是,整个树是否是动态的.这不考虑任一个结点的动态设置.