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 '';
        }

        # ATTENTION: The newline after <div class="gallerytext"> is needed to accommodate htmltidy which
        # in version 4.8.6 generated crackpot html in its absence, see:
        # http://bugzilla.wikimedia.org/show_bug.cgi?id=1765 -Ævar

        $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">' . "\n"
                    . $galleryText
                    . "\n\t\t\t</div>";
    }
}

class PackedHoverImageGallery extends PackedOverlayImageGallery { }