/**
* Registers the image button to receive postback data during postback.
* This is necessary because an image button, when postback, does not have
* direct mapping between post data and the image button name.
* This method overrides the parent implementation and is invoked before render.
* @param mixed event parameter
*/
public function onPreRender($param)
{
parent::onPreRender($param);
$this->getPage()->registerRequiresPostData($this);
}
/**
* Configures the image URL that shows the token.
* @param mixed event parameter
*/
public function onPreRender($param)
{
parent::onPreRender($param);
if (!self::checkRequirements()) {
throw new TConfigurationException('captcha_imagettftext_required');
}
if (!$this->getViewState('TokenGenerated', 0)) {
$manager = $this->getApplication()->getAssetManager();
$manager->publishFilePath($this->getFontFile());
$url = $manager->publishFilePath($this->getCaptchaScriptFile());
$url .= '?options=' . urlencode($this->getTokenImageOptions());
$this->setImageUrl($url);
$this->setViewState('TokenGenerated', time());
}
}