Simple class to get a preview above the upload button if file is already uploaded

sfWidgetFormInputFileWithPreview.class.php

<?php

/**
 * Required plugin
 * https://github.com/aalbagarcia/sfThumbnailPlugin
 */

/**
 * Class sfWidgetFormInputFileWithPreview
 *
 * Simple class to get a preview above the upload button if file is already uploaded
 *
 * @example
 *
 *    $this->setWidget('image', new sfWidgetFormInputFileWithPreview());
 *    $this->setValidator('image', new sfValidatorFile(array(
 *      'mime_types' => 'web_images',
 *      'path' => sfConfig::get('sf_root_dir').'/data/images/',
 *      'required'=>false,
 *    )));
 * 
 */
class sfWidgetFormInputFileWithPreview extends sfWidgetFormInputFile
{

  public function render($name, $value = null, $attributes = array(), $errors = array())
  {
    $html = '';

    if($value)
    {
      $fileName = explode('.', $value);
      $thumbnail = new sfThumbnail(150, 150);
      //@todo Create a more flexible way to save the paths
      $thumbnail->loadFile(sfConfig::get('sf_root_dir').'/data/images/'.$value);
      $thumbnail->save(sfConfig::get('sf_upload_dir').'/thumbnails/150x150_'.$fileName[0].'.png', 'image/png');

      $html .= $this->renderTag('img', array('src'=>'/uploads/thumbnails/150x150_'.$fileName[0].'.png'));
    }
    $html .=  $this->renderTag('input', array_merge(array('type' => $this->getOption('type'), 'name' => $name, 'value' => $value), $attributes));

    return $html;
  }
}