Rendering Active Branch of Zend Navigation Without Top Level - php

Question

I am rendering the top-level elements of a Zend Navigation object in one place like this:
echo $this->navigation()->menu()->setMaxDepth(0);
How do I render the navigation tree from the second level on down for the active branch? I've tried creating a partial that loops the $this->container object, but I don't know how to determine if my current item is the active branch. Once I've determined that it's the active branch how do I render the menu? Am I doing this the hard way and missing something obvious?
Thanks!
UPDATE:
I accepted a solution because that's what I used, but I also would like to provide the answer to my actual question, for reference sake. ($this is the view object)
// Find the active branch, at a depth of one
$branch = $this->navigation()->findActive($this->nav, 1, 1);
if (0 == count($branch)) {
// no active branch, find the default branch
$pages = $this->nav->findById('default-branch')->getPages();
} else {
$pages = $branch['page']->getPages();
}
$this->subNav = new Zend_Navigation($pages);
$this->subNav can then be used to render the sub-menu.

Answer 1

If I got your question right, this is how I do it:
print $this->navigation()->menu()->renderMenu(null, array(
'minDepth' => 1,
'maxDepth' => 1,
'onlyActiveBranch' => true,
'renderParents' => false));
Renders only the submenu of currently active menu.

Answer 2

I do something similar. My main navigation is handled with something like this...
$this->navigation()->menu()->setPartial('tabs.phtml');
echo $this->navigation()->menu()->render();
Then in my tabs.phtml I iterate over the container like so...
if (count($this->container)) {
foreach($this->container as $page) {
if ($page->isVisible()) {
if ($page->isActive(true)) {
$subcontainer = $page->getPages();
foreach($subcontainer as $subpage) {
// echo my link
}
}
}
}
}
I hope that helps a bit.

Answer 3

I do it this way:
<?php
// Render top-level elements
echo $this->navigation()->menu()->setMaxDepth(0);
// Render 2nd level elements for active element
echo $this->navigation()->menu()
->setOnlyActiveBranch(true)
->setRenderParents(false)
->setMinDepth(1);
?>
but this is not a good solution. Better one for each level as a separate menu:
<!-- level 1 -->
<?php echo $this->navigation()->menu()->setMaxDepth(0); ?>
<!-- level 2 -->
<?php echo $this->navigation()->menu()->setOnlyActiveBranch(true)->setRenderParents(true)->setMinDepth(1)->setMaxDepth(1); ?>
<!-- level 3 -->
<?php echo $this->navigation()->menu()->setOnlyActiveBranch(true)->setRenderParents(false)->setMinDepth(2)->setMaxDepth(2); ?>