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[mediawiki.git] / includes / ImageGallery.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
 */

/**
 * Image gallery
 *
 * Add images to the gallery using add(), then render that list to HTML using toHTML().
 *
 * @ingroup Media
 */
class ImageGallery {
        var $mImages, $mShowBytes, $mShowFilename;
        var $mCaption = false;

        /**
         * Hide blacklisted images?
         */
        var $mHideBadImages;

        /**
         * Registered parser object for output callbacks
         * @var Parser
         */
        var $mParser;

        /**
         * Contextual title, used when images are being screened
         * against the bad image list
         */
        protected $contextTitle = false;

        protected $mAttribs = array();

        /**
         * Fixed margins
         */
        const THUMB_PADDING = 30;
        const GB_PADDING = 5;
        // 2px borders on each side + 2px implied padding on each side
        const GB_BORDERS = 8;

        /**
         * Create a new image gallery object.
         */
        function __construct() {
                global $wgGalleryOptions;
                $this->mImages = array();
                $this->mShowBytes = $wgGalleryOptions['showBytes'];
                $this->mShowFilename = true;
                $this->mParser = false;
                $this->mHideBadImages = false;
                $this->mPerRow = $wgGalleryOptions['imagesPerRow'];
                $this->mWidths = $wgGalleryOptions['imageWidth'];
                $this->mHeights = $wgGalleryOptions['imageHeight'];
                $this->mCaptionLength = $wgGalleryOptions['captionLength'];
        }

        /**
         * Register a parser object
         *
         * @param $parser Parser
         */
        function setParser( $parser ) {
                $this->mParser = $parser;
        }

        /**
         * Set bad image flag
         */
        function setHideBadImages( $flag = true ) {
                $this->mHideBadImages = $flag;
        }

        /**
         * Set the caption (as plain text)
         *
         * @param string $caption Caption
         */
        function setCaption( $caption ) {
                $this->mCaption = htmlspecialchars( $caption );
        }

        /**
         * Set the caption (as HTML)
         *
         * @param string $caption Caption
         */
        public function setCaptionHtml( $caption ) {
                $this->mCaption = $caption;
        }

        /**
         * Set how many images will be displayed per row.
         *
         * @param $num Integer >= 0; If perrow=0 the gallery layout will adapt to screensize
         * invalid numbers will be rejected
         */
        public function setPerRow( $num ) {
                if ( $num >= 0 ) {
                        $this->mPerRow = (int)$num;
                }
        }

        /**
         * Set how wide each image will be, in pixels.
         *
         * @param $num Integer > 0; invalid numbers will be ignored
         */
        public function setWidths( $num ) {
                if ( $num > 0 ) {
                        $this->mWidths = (int)$num;
                }
        }

        /**
         * Set how high each image will be, in pixels.
         *
         * @param $num Integer > 0; invalid numbers will be ignored
         */
        public function setHeights( $num ) {
                if ( $num > 0 ) {
                        $this->mHeights = (int)$num;
                }
        }

        /**
         * Instruct the class to use a specific skin for rendering
         *
         * @param $skin Skin object
         * @deprecated since 1.18 Not used anymore
         */
        function useSkin( $skin ) {
                wfDeprecated( __METHOD__, '1.18' );
                /* no op */
        }

        /**
         * Add an image to the gallery.
         *
         * @param $title Title object of the image that is added to the gallery
         * @param $html  String: Additional HTML text to be shown. The name and size of the image are always shown.
         * @param $alt   String: Alt text for the image
         * @param $link  String: Override image link (optional)
         * @param $handlerOpts Array: Array of options for image handler (aka page number)
         */
        function add( $title, $html = '', $alt = '', $link = '', $handlerOpts = array() ) {
                if ( $title instanceof File ) {
                        // Old calling convention
                        $title = $title->getTitle();
                }
                $this->mImages[] = array( $title, $html, $alt, $link, $handlerOpts );
                wfDebug( 'ImageGallery::add ' . $title->getText() . "\n" );
        }

        /**
         * Add an image at the beginning of the gallery.
         *
         * @param $title Title object of the image that is added to the gallery
         * @param $html  String: Additional HTML text to be shown. The name and size of the image are always shown.
         * @param $alt   String: Alt text for the image
         * @param $link  String: Override image link (optional)
         * @param $handlerOpts Array: Array of options for image handler (aka page number)
         */
        function insert( $title, $html = '', $alt = '', $link = '', $handlerOpts = array() ) {
                if ( $title instanceof File ) {
                        // Old calling convention
                        $title = $title->getTitle();
                }
                array_unshift( $this->mImages, array( &$title, $html, $alt, $link, $handlerOpts ) );
        }

        /**
         * isEmpty() returns true if the gallery contains no images
         * @return bool
         */
        function isEmpty() {
                return empty( $this->mImages );
        }

        /**
         * Enable/Disable showing of the file size of an image in the gallery.
         * Enabled by default.
         *
         * @param $f Boolean: set to false to disable.
         */
        function setShowBytes( $f ) {
                $this->mShowBytes = (bool)$f;
        }

        /**
         * Enable/Disable showing of the filename of an image in the gallery.
         * Enabled by default.
         *
         * @param $f Boolean: set to false to disable.
         */
        function setShowFilename( $f ) {
                $this->mShowFilename = (bool)$f;
        }

        /**
         * Set arbitrary attributes to go on the HTML gallery output element.
         * Should be suitable for a <ul> element.
         *
         * Note -- if taking from user input, you should probably run through
         * Sanitizer::validateAttributes() first.
         *
         * @param array $attribs of HTML attribute pairs
         */
        function setAttributes( $attribs ) {
                $this->mAttribs = $attribs;
        }

        /**
         * 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 + self::THUMB_PADDING + self::GB_PADDING + self::GB_BORDERS );
                        $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' ), $this->mAttribs );

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

                $lang = $this->getLang();
                $params = array(
                        'width' => $this->mWidths,
                        'height' => $this->mHeights
                );
                # Output each image...
                foreach ( $this->mImages as $pair ) {
                        $nt = $pair[0];
                        $text = $pair[1]; # "text" means "caption" here
                        $alt = $pair[2];
                        $link = $pair[3];
                        // $pair[4] is per image handler options
                        $transformOptions = $params + $pair[4];

                        $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;
                        }

                        if ( !$img ) {
                                # We're dealing with a non-image, spit out the name and be done with it.
                                $thumbhtml = "\n\t\t\t" . '<div style="height: ' . ( self::THUMB_PADDING + $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 style="height: ' . ( self::THUMB_PADDING + $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 style="height: ' . ( self::THUMB_PADDING + $this->mHeights ) . 'px;">'
                                        . htmlspecialchars( $img->getLastError() ) . '</div>';
                        } else {
                                $vpad = ( self::THUMB_PADDING + $this->mHeights - $thumb->height ) / 2;

                                $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();
                                }

                                # Set both fixed width and min-height.
                                $thumbhtml = "\n\t\t\t" .
                                        '<div class="thumb" style="width: ' . ( $this->mWidths + self::THUMB_PADDING ) . '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 = wfMessage( '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" :
                                '';

                        # 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

                        # 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->mWidths + self::THUMB_PADDING + self::GB_PADDING ) . 'px">'
                                        . '<div style="width: ' . ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING ) . 'px">'
                                        . $thumbhtml
                                        . "\n\t\t\t" . '<div class="gallerytext">' . "\n"
                                        . $textlink . $text . $fileSize
                                        . "\n\t\t\t</div>"
                                        . "\n\t\t</div></li>";
                }
                $output .= "\n</ul>";

                return $output;
        }

        /**
         * @return Integer: number of images in the gallery
         */
        public function count() {
                return count( $this->mImages );
        }

        /**
         * Set the contextual title
         *
         * @param $title Title: contextual title
         */
        public function setContextTitle( $title ) {
                $this->contextTitle = $title;
        }

        /**
         * Get the contextual title, if applicable
         *
         * @return mixed Title or false
         */
        public function getContextTitle() {
                return is_object( $this->contextTitle ) && $this->contextTitle instanceof Title
                        ? $this->contextTitle
                        : false;
        }

        /**
         * Determines the correct language to be used for this image gallery
         * @return Language object
         */
        private function getLang() {
                global $wgLang;
                return $this->mParser
                        ? $this->mParser->getTargetLanguage()
                        : $wgLang;
        }

} //class