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<?php
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function bootstrap_file_widget($variables) {
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$element = $variables['element'];
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$output = '';
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$hidden_elements = array();
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foreach (element_children($element) as $child) {
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if ($element[$child]['#type'] === 'hidden') {
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$hidden_elements[$child] = $element[$child];
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unset($element[$child]);
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}
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}
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$element['upload_button']['#prefix'] = '<span class="input-group-btn">';
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$element['upload_button']['#suffix'] = '</span>';
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$output .= '<div class="file-widget form-managed-file clearfix input-group">';
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if (!empty($element['fid']['#value'])) {
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$element['filename']['#markup'] .= ' <span class="file-size">(' . format_size($element['#file']->filesize) . ')</span> ';
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}
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$output .= drupal_render_children($element);
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$output .= '</div>';
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$output .= render($hidden_elements);
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return $output;
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}
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