public function update($only_if_not_modified = true)
 {
     if (!$this->path_custom || $this->type != self::OVERRIDDEN) {
         return true;
     }
     $files = $this->getFiles();
     $modified = array();
     foreach ($files as $f_id => $f) {
         if (!empty($f['modified'])) {
             $modified[] = $f_id;
             break;
         }
     }
     if ($only_if_not_modified && $modified) {
         return false;
     }
     $img_files = array();
     foreach ($this->getSettings() as $s) {
         if (ifset($s['control_type']) == 'image' && !empty($s['value'])) {
             $img_files[] = $s['value'];
         }
     }
     $source_path = $this->path_original;
     $target_path = $this->path_custom;
     $list_files = waFiles::listdir($source_path);
     $skip_pattern = '/\\.(files\\.md5|cvs|svn|git|php\\d*)$/';
     foreach ($list_files as $f) {
         // ignore files
         if ($f !== 'build.php') {
             foreach ((array) $skip_pattern as $pattern) {
                 if (preg_match($pattern, $f)) {
                     continue 2;
                 }
             }
         }
         // ignore image settings and modified
         if ($f == 'theme.xml' || in_array($f, $img_files) || in_array($f, $modified)) {
             continue;
         }
         try {
             waFiles::copy($source_path . '/' . $f, $target_path . '/' . $f);
         } catch (waException $e) {
         }
     }
     if ($this->type == self::OVERRIDDEN) {
         $theme_original = new waTheme($this->id, $this->app_id, self::ORIGINAL);
         $this->version = $theme_original->version;
         foreach ($theme_original->getFiles(true) as $f_id => $f) {
             if (empty($files[$f_id])) {
                 $this->setFiles(array($f_id => $f));
             }
         }
         foreach ($theme_original->getSettings('full') as $var => $s) {
             if (!isset($this->info['settings'][$var])) {
                 $this->info['settings'][$var] = $s;
                 $this->settings[$var]['value'] = ifset($s['value'], '');
                 $this->changed['settings'][$var] = true;
             } else {
                 $old_s = $this->info['settings'][$var];
                 if (ifset($old_s['control_type']) != ifset($s['control_type']) || ifset($old_s['options']) != ifset($s['options'])) {
                     $s['value'] = ifset($old_s['value'], '');
                     $this->info['settings'][$var] = $s;
                     $this->settings[$var]['value'] = $s['value'];
                     $this->changed['settings'][$var] = true;
                 }
             }
         }
         $this->save();
     }
     return true;
 }