[fw-general] What is the right way of setting default decorators for Zend_Form elements

[jiewmeng]

i currently set my default decorators for my Zend_Form using a class
extending from Zend_Form ... i didnt want to just use
$this->setElementDecorators() because i will use the same decorators for all
forms in the app


class Application_Form_Abstract extends Zend_Form {
    ... 
    function loadDefaultDecorators() {
        if ($this->loadDefaultDecoratorsIsDisabled()) {
            return $this;
        }

        // ... for elements
        $decorators = $this->_elementDecorators;
        if (empty($decorators)) {
            $this->setElementDecorators(array(
                'ViewHelper',
                'Errors',
                array('Description', array('tag' => 'p', 'escape' =>
false)),
                'Label',
                array('HtmlTag', array('tag' => 'p'))
            ));


but i soon realize that that way, i cannot define specific element
decorators like


$this->addElement('textarea', 'bio', array(
    'decorators' => array(
        'ViewHelper',
        'Errors',
        array('Description', array('tag' => 'p', 'escape' => false)),
        'Label',
        array('HtmlTag', array('tag' => 'p')),
        new Application_Form_Decorator_WmdPreview,
     )
));


as they will be over-written by my custom loadDefaultDecorators() function.
i wonder if there is any way i can set default decorators for element only
if they have no set decorators


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