Merge "Update comment in DefaultSettings for bug 17180"

[mediawiki.git] / includes / gallery / TraditionalImageGallery.php

<?php
/**
 * Image gallery.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

class TraditionalImageGallery extends ImageGalleryBase {

        /**
         * Return a HTML representation of the image gallery
         *
         * For each image in the gallery, display
         * - a thumbnail
         * - the image name
         * - the additional text provided when adding the image
         * - the size of the image
         *
         * @return string
         */
        function toHTML() {
                if ( $this->mPerRow > 0 ) {
                        $maxwidth = $this->mPerRow * ( $this->mWidths + $this->getAllPadding() );
                        $oldStyle = isset( $this->mAttribs['style'] ) ? $this->mAttribs['style'] : '';
                        # _width is ignored by any sane browser. IE6 doesn't know max-width so it uses _width instead
                        $this->mAttribs['style'] = "max-width: {$maxwidth}px;_width: {$maxwidth}px;" . $oldStyle;
                }

                $attribs = Sanitizer::mergeAttributes(
                        array( 'class' => 'gallery mw-gallery-' . $this->mMode ), $this->mAttribs );

                $modules = $this->getModules();

                if ( $this->mParser ) {
                        $this->mParser->getOutput()->addModules( $modules );
                } else {
                        $this->getOutput()->addModules( $modules );
                }
                $output = Xml::openElement( 'ul', $attribs );
                if ( $this->mCaption ) {
                        $output .= "\n\t<li class='gallerycaption'>{$this->mCaption}</li>";
                }

                $lang = $this->getRenderLang();
                # Output each image...
                foreach ( $this->mImages as $pair ) {
                        $nt = $pair[0];
                        $text = $pair[1]; # "text" means "caption" here
                        $alt = $pair[2];
                        $link = $pair[3];

                        $descQuery = false;
                        if ( $nt->getNamespace() === NS_FILE ) {
                                # Get the file...
                                if ( $this->mParser instanceof Parser ) {
                                        # Give extensions a chance to select the file revision for us
                                        $options = array();
                                        wfRunHooks( 'BeforeParserFetchFileAndTitle',
                                                array( $this->mParser, $nt, &$options, &$descQuery ) );
                                        # Fetch and register the file (file title may be different via hooks)
                                        list( $img, $nt ) = $this->mParser->fetchFileAndTitle( $nt, $options );
                                } else {
                                        $img = wfFindFile( $nt );
                                }
                        } else {
                                $img = false;
                        }

                        $params = $this->getThumbParams( $img );
                        // $pair[4] is per image handler options
                        $transformOptions = $params + $pair[4];

                        $thumb = false;

                        if ( !$img ) {
                                # We're dealing with a non-image, spit out the name and be done with it.
                                $thumbhtml = "\n\t\t\t" . '<div class="thumb" style="height: ' . ( $this->getThumbPadding() + $this->mHeights ) . 'px;">'
                                        . htmlspecialchars( $nt->getText() ) . '</div>';

                                if ( $this->mParser instanceof Parser ) {
                                        $this->mParser->addTrackingCategory( 'broken-file-category' );
                                }
                        } elseif ( $this->mHideBadImages && wfIsBadImage( $nt->getDBkey(), $this->getContextTitle() ) ) {
                                # The image is blacklisted, just show it as a text link.
                                $thumbhtml = "\n\t\t\t" . '<div class="thumb" style="height: ' . ( $this->getThumbPadding() + $this->mHeights ) . 'px;">' .
                                        Linker::link(
                                                $nt,
                                                htmlspecialchars( $nt->getText() ),
                                                array(),
                                                array(),
                                                array( 'known', 'noclasses' )
                                        ) .
                                        '</div>';
                        } elseif ( !( $thumb = $img->transform( $transformOptions ) ) ) {
                                # Error generating thumbnail.
                                $thumbhtml = "\n\t\t\t" . '<div class="thumb" style="height: ' . ( $this->getThumbPadding() + $this->mHeights ) . 'px;">'
                                        . htmlspecialchars( $img->getLastError() ) . '</div>';
                        } else {
                                $vpad = $this->getVPad( $this->mHeights, $thumb->getHeight() );

                                $imageParameters = array(
                                        'desc-link' => true,
                                        'desc-query' => $descQuery,
                                        'alt' => $alt,
                                        'custom-url-link' => $link
                                );
                                # In the absence of both alt text and caption, fall back on providing screen readers with the filename as alt text
                                if ( $alt == '' && $text == '' ) {
                                        $imageParameters['alt'] = $nt->getText();
                                }

                                $this->adjustImageParameters( $thumb, $imageParameters );

                                # Set both fixed width and min-height.
                                $thumbhtml = "\n\t\t\t" .
                                        '<div class="thumb" style="width: ' . $this->getThumbDivWidth( $thumb->getWidth() ) . 'px;">'
                                        # Auto-margin centering for block-level elements. Needed now that we have video
                                        # handlers since they may emit block-level elements as opposed to simple <img> tags.
                                        # ref http://css-discuss.incutio.com/?page=CenteringBlockElement
                                        . '<div style="margin:' . $vpad . 'px auto;">'
                                        . $thumb->toHtml( $imageParameters ) . '</div></div>';

                                // Call parser transform hook
                                if ( $this->mParser && $img->getHandler() ) {
                                        $img->getHandler()->parserTransformHook( $this->mParser, $img );
                                }
                        }

                        //TODO
                        // $linkTarget = Title::newFromText( $wgContLang->getNsText( MWNamespace::getUser() ) . ":{$ut}" );
                        // $ul = Linker::link( $linkTarget, $ut );

                        if ( $this->mShowBytes ) {
                                if ( $img ) {
                                        $fileSize = htmlspecialchars( $lang->formatSize( $img->getSize() ) );
                                } else {
                                        $fileSize = $this->msg( 'filemissing' )->escaped();
                                }
                                $fileSize = "$fileSize<br />\n";
                        } else {
                                $fileSize = '';
                        }

                        $textlink = $this->mShowFilename ?
                                Linker::link(
                                        $nt,
                                        htmlspecialchars( $lang->truncate( $nt->getText(), $this->mCaptionLength ) ),
                                        array(),
                                        array(),
                                        array( 'known', 'noclasses' )
                                ) . "<br />\n" :
                                '';

                        $galleryText = $textlink . $text . $fileSize;
                        $galleryText = $this->wrapGalleryText( $galleryText, $thumb );

                        # Weird double wrapping (the extra div inside the li) needed due to FF2 bug
                        # Can be safely removed if FF2 falls completely out of existence
                        $output .=
                                "\n\t\t" . '<li class="gallerybox" style="width: ' . $this->getGBWidth( $thumb ) . 'px">'
                                        . '<div style="width: ' . $this->getGBWidth( $thumb ) . 'px">'
                                        . $thumbhtml
                                        . $galleryText
                                        . "\n\t\t</div></li>";
                }
                $output .= "\n</ul>";

                return $output;
        }

        /**
         * Add the wrapper html around the thumb's caption
         *
         * @param String $galleryText The caption
         * @param MediaTransformOutput|boolean $thumb The thumb this caption is for or false for bad image.
         */
        protected function wrapGalleryText( $galleryText, $thumb ) {
                # 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

                return "\n\t\t\t" . '<div class="gallerytext">' . "\n"
                                        . $galleryText
                                        . "\n\t\t\t</div>";
        }

        /**
         * How much padding such the thumb have between image and inner div that
         * that contains the border. This is both for verical and horizontal
         * padding. (However, it is cut in half in the vertical direction).
         * @return int
         */
        protected function getThumbPadding() {
                return 30;
        }

        /**
         *
         * @note GB stands for gallerybox (as in the <li class="gallerybox"> element)
         *
         * @return int
         */
        protected function getGBPadding() {
                return 5;
        }

        /**
         * Get how much extra space the borders around the image takes up.
         *
         * For this mode, it is 2px borders on each side + 2px implied padding on
         * each side from the stylesheet, giving us 2*2+2*2 = 8.
         * @return int
         */
        protected function getGBBorders() {
                return 8;
        }

        /**
         * Get total padding.
         *
         * @return int How many pixels of whitespace surround the thumbnail.
         */
        protected function getAllPadding() {
                return $this->getThumbPadding() + $this->getGBPadding() + $this->getGBBorders();
        }

        /**
         * Get vertical padding for a thumbnail
         *
         * Generally this is the total height minus how high the thumb is.
         *
         * @param int $boxHeight How high we want the box to be.
         * @param int $thumbHeight How high the thumbnail is.
         * @return int How many vertical padding to add on each side.
         */
        protected function getVPad( $boxHeight, $thumbHeight ) {
                return ( $this->getThumbPadding() + $boxHeight - $thumbHeight ) / 2;
        }

        /**
         * Get the transform parameters for a thumbnail.
         *
         * @param File $img The file in question. May be false for invalid image
         */
        protected function getThumbParams( $img ) {
                return array(
                        'width' => $this->mWidths,
                        'height' => $this->mHeights
                );
        }

        /**
         * Get the width of the inner div that contains the thumbnail in
         * question. This is the div with the class of "thumb".
         *
         * @param int $thumbWidth The width of the thumbnail.
         * @return int Width of inner thumb div.
         */
        protected function getThumbDivWidth( $thumbWidth ) {
                return $this->mWidths + $this->getThumbPadding();
        }

        /**
         * Width of gallerybox <li>.
         *
         * Generally is the width of the image, plus padding on image
         * plus padding on gallerybox.
         *
         * @note Important: parameter will be false if no thumb used.
         * @param Mixed $thumb MediaTransformObject object or false.
         * @return int width of gallerybox element
         */
        protected function getGBWidth( $thumb ) {
                return $this->mWidths + $this->getThumbPadding() + $this->getGBPadding();
        }

        /**
         * Get a list of modules to include in the page.
         *
         * Primarily intended for subclasses.
         *
         * @return Array modules to include
         */
        protected function getModules() {
                return array();
        }

        /**
         * Adjust the image parameters for a thumbnail.
         *
         * Used by a subclass to insert extra high resolution images.
         * @param MediaTransformOutput $thumb The thumbnail
         * @param Array $imageParameters Array of options
         */
        protected function adjustImageParameters( $thumb, &$imageParameters ) { }
}

/**
 * Backwards compatibility. This always uses traditional mode
 * if called the old way, for extensions that may expect traditional
 * mode.
 *
 * @deprecated 1.22 Use ImageGalleryBase::factory instead.
 */
class ImageGallery extends TraditionalImageGallery {
        function __construct( $mode = 'traditional' ) {
                wfDeprecated( __METHOD__, '1.22' );
                parent::__construct( $mode );
        }
}