Add another form to the stack; clicking 'apply' will go to this form rather than closing the ajax popup.
public function addFormToStack($key, $display_id, $type, $id = NULL, $top = FALSE, $rebuild_keys = FALSE) {
// Reset the cache of IDs. Drupal rather aggressively prevents ID
// duplication but this causes it to remember IDs that are no longer even
// being used.
$seen_ids_init =& drupal_static('drupal_html_id:init');
$seen_ids_init = array();
if (empty($this->stack)) {
$this->stack = array();
}
$stack = array(
implode('-', array_filter(array(
$key,
$this
->id(),
$display_id,
$type,
$id,
))),
$key,
$display_id,
$type,
$id,
);
// If we're being asked to add this form to the bottom of the stack, no
// special logic is required. Our work is equally easy if we were asked to add
// to the top of the stack, but there's nothing in it yet.
if (!$top || empty($this->stack)) {
$this->stack[] = $stack;
}
else {
$keys = array_keys($this->stack);
$first = current($keys);
$last = end($keys);
for ($i = $last; $i >= $first; $i--) {
if (!isset($this->stack[$i])) {
continue;
}
// Move form number $i to the next position in the stack.
$this->stack[$i + 1] = $this->stack[$i];
unset($this->stack[$i]);
}
// Now that the previously $first slot is free, move the new form into it.
$this->stack[$first] = $stack;
ksort($this->stack);
// Start the keys from 0 again, if requested.
if ($rebuild_keys) {
$this->stack = array_values($this->stack);
}
}
}