Get the user's current progress through the form stack.
FALSE if the user is not currently in a multiple-form stack. Otherwise, an associative array with the following keys:
public function getFormProgress() {
$progress = FALSE;
if (!empty($this->stack)) {
$stack = $this->stack;
// The forms on the stack have integer keys that don't change as the forms
// are completed, so we can see which ones are still left.
$keys = array_keys($this->stack);
// Add 1 to the array keys for the benefit of humans, who start counting
// from 1 and not 0.
$current = reset($keys) + 1;
$total = end($keys) + 1;
if ($total > 1) {
$progress = array();
$progress['current'] = $current;
$progress['total'] = $total;
}
}
return $progress;
}