PackedOverlayImageGallery.php

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<?php
class PackedOverlayImageGallery extends PackedImageGallery {
    protected function wrapGalleryText( $galleryText, $thumb ) {
        // If we have no text, do not output anything to avoid
        // ugly white overlay.
        if ( trim( $galleryText ) === '' ) {
            return '';
        }
 
        $thumbWidth = $this->getGBWidth( $thumb ) - $this->getThumbPadding() - $this->getGBPadding();
        $captionWidth = ceil( $thumbWidth - 20 );
 
        $outerWrapper = '<div class="gallerytextwrapper" style="width: ' . $captionWidth . 'px">';
 
        return "\n\t\t\t" .
            $outerWrapper . '<div class="gallerytext">' . $galleryText . "</div>"
            . "\n\t\t\t</div>";
    }
}