includes/gallery/TraditionalImageGallery.php

   1 <?php
   2 /**
   3  * Image gallery.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 class TraditionalImageGallery extends ImageGalleryBase {
  24         /**
  25          * Return a HTML representation of the image gallery
  26          *
  27          * For each image in the gallery, display
  28          * - a thumbnail
  29          * - the image name
  30          * - the additional text provided when adding the image
  31          * - the size of the image
  32          *
  33          * @return string
  34          */
  35         function toHTML() {
  36                 if ( $this->mPerRow > 0 ) {
  37                         $maxwidth = $this->mPerRow * ( $this->mWidths + $this->getAllPadding() );
  38                         $oldStyle = isset( $this->mAttribs['style'] ) ? $this->mAttribs['style'] : '';
  39                         # _width is ignored by any sane browser. IE6 doesn't know max-width
  40                         # so it uses _width instead
  41                         $this->mAttribs['style'] = "max-width: {$maxwidth}px;_width: {$maxwidth}px;" .
  42                                 $oldStyle;
  43                 }
  44
  45                 $attribs = Sanitizer::mergeAttributes(
  46                         array( 'class' => 'gallery mw-gallery-' . $this->mMode ), $this->mAttribs );
  47
  48                 $modules = $this->getModules();
  49
  50                 if ( $this->mParser ) {
  51                         $this->mParser->getOutput()->addModules( $modules );
  52                 } else {
  53                         $this->getOutput()->addModules( $modules );
  54                 }
  55                 $output = Xml::openElement( 'ul', $attribs );
  56                 if ( $this->mCaption ) {
  57                         $output .= "\n\t<li class='gallerycaption'>{$this->mCaption}</li>";
  58                 }
  59
  60                 $lang = $this->getRenderLang();
  61                 # Output each image...
  62                 foreach ( $this->mImages as $pair ) {
  63                         /** @var Title $nt */
  64                         $nt = $pair[0];
  65                         $text = $pair[1]; # "text" means "caption" here
  66                         $alt = $pair[2];
  67                         $link = $pair[3];
  68
  69                         $descQuery = false;
  70                         if ( $nt->getNamespace() === NS_FILE ) {
  71                                 # Get the file...
  72                                 if ( $this->mParser instanceof Parser ) {
  73                                         # Give extensions a chance to select the file revision for us
  74                                         $options = array();
  75                                         Hooks::run( 'BeforeParserFetchFileAndTitle',
  76                                                 array( $this->mParser, $nt, &$options, &$descQuery ) );
  77                                         # Fetch and register the file (file title may be different via hooks)
  78                                         list( $img, $nt ) = $this->mParser->fetchFileAndTitle( $nt, $options );
  79                                 } else {
  80                                         $img = wfFindFile( $nt );
  81                                 }
  82                         } else {
  83                                 $img = false;
  84                         }
  85
  86                         $params = $this->getThumbParams( $img );
  87                         // $pair[4] is per image handler options
  88                         $transformOptions = $params + $pair[4];
  89
  90                         $thumb = false;
  91
  92                         if ( !$img ) {
  93                                 # We're dealing with a non-image, spit out the name and be done with it.
  94                                 $thumbhtml = "\n\t\t\t" . '<div class="thumb" style="height: '
  95                                         . ( $this->getThumbPadding() + $this->mHeights ) . 'px;">'
  96                                         . htmlspecialchars( $nt->getText() ) . '</div>';
  97
  98                                 if ( $this->mParser instanceof Parser ) {
  99                                         $this->mParser->addTrackingCategory( 'broken-file-category' );
 100                                 }
 101                         } elseif ( $this->mHideBadImages
 102                                 && wfIsBadImage( $nt->getDBkey(), $this->getContextTitle() )
 103                         ) {
 104                                 # The image is blacklisted, just show it as a text link.
 105                                 $thumbhtml = "\n\t\t\t" . '<div class="thumb" style="height: ' .
 106                                         ( $this->getThumbPadding() + $this->mHeights ) . 'px;">' .
 107                                         Linker::linkKnown(
 108                                                 $nt,
 109                                                 htmlspecialchars( $nt->getText() )
 110                                         ) .
 111                                         '</div>';
 112                         } elseif ( !( $thumb = $img->transform( $transformOptions ) ) ) {
 113                                 # Error generating thumbnail.
 114                                 $thumbhtml = "\n\t\t\t" . '<div class="thumb" style="height: '
 115                                         . ( $this->getThumbPadding() + $this->mHeights ) . 'px;">'
 116                                         . htmlspecialchars( $img->getLastError() ) . '</div>';
 117                         } else {
 118                                 /** @var MediaTransformOutput $thumb */
 119                                 $vpad = $this->getVPad( $this->mHeights, $thumb->getHeight() );
 120
 121                                 $imageParameters = array(
 122                                         'desc-link' => true,
 123                                         'desc-query' => $descQuery,
 124                                         'alt' => $alt,
 125                                         'custom-url-link' => $link
 126                                 );
 127
 128                                 // In the absence of both alt text and caption, fall back on
 129                                 // providing screen readers with the filename as alt text
 130                                 if ( $alt == '' && $text == '' ) {
 131                                         $imageParameters['alt'] = $nt->getText();
 132                                 }
 133
 134                                 $this->adjustImageParameters( $thumb, $imageParameters );
 135
 136                                 Linker::processResponsiveImages( $img, $thumb, $transformOptions );
 137
 138                                 # Set both fixed width and min-height.
 139                                 $thumbhtml = "\n\t\t\t"
 140                                         . '<div class="thumb" style="width: '
 141                                         . $this->getThumbDivWidth( $thumb->getWidth() ) . 'px;">'
 142                                         # Auto-margin centering for block-level elements. Needed
 143                                         # now that we have video handlers since they may emit block-
 144                                         # level elements as opposed to simple <img> tags. ref
 145                                         # http://css-discuss.incutio.com/?page=CenteringBlockElement
 146                                         . '<div style="margin:' . $vpad . 'px auto;">'
 147                                         . $thumb->toHtml( $imageParameters ) . '</div></div>';
 148
 149                                 // Call parser transform hook
 150                                 /** @var MediaHandler $handler */
 151                                 $handler = $img->getHandler();
 152                                 if ( $this->mParser && $handler ) {
 153                                         $handler->parserTransformHook( $this->mParser, $img );
 154                                 }
 155                         }
 156
 157                         // @todo Code is incomplete.
 158                         // $linkTarget = Title::newFromText( $wgContLang->getNsText( MWNamespace::getUser() ) .
 159                         // ":{$ut}" );
 160                         // $ul = Linker::link( $linkTarget, $ut );
 161
 162                         if ( $this->mShowBytes ) {
 163                                 if ( $img ) {
 164                                         $fileSize = htmlspecialchars( $lang->formatSize( $img->getSize() ) );
 165                                 } else {
 166                                         $fileSize = $this->msg( 'filemissing' )->escaped();
 167                                 }
 168                                 $fileSize = "$fileSize<br />\n";
 169                         } else {
 170                                 $fileSize = '';
 171                         }
 172
 173                         $textlink = $this->mShowFilename ?
 174                                 Linker::linkKnown(
 175                                         $nt,
 176                                         htmlspecialchars( $lang->truncate( $nt->getText(), $this->mCaptionLength ) )
 177                                 ) . "<br />\n" :
 178                                 '';
 179
 180                         $galleryText = $textlink . $text . $fileSize;
 181                         $galleryText = $this->wrapGalleryText( $galleryText, $thumb );
 182
 183                         # Weird double wrapping (the extra div inside the li) needed due to FF2 bug
 184                         # Can be safely removed if FF2 falls completely out of existence
 185                         $output .= "\n\t\t" . '<li class="gallerybox" style="width: '
 186                                 . $this->getGBWidth( $thumb ) . 'px">'
 187                                 . '<div style="width: ' . $this->getGBWidth( $thumb ) . 'px">'
 188                                 . $thumbhtml
 189                                 . $galleryText
 190                                 . "\n\t\t</div></li>";
 191                 }
 192                 $output .= "\n</ul>";
 193
 194                 return $output;
 195         }
 196
 197         /**
 198          * Add the wrapper html around the thumb's caption
 199          *
 200          * @param string $galleryText The caption
 201          * @param MediaTransformOutput|bool $thumb The thumb this caption is for
 202          *   or false for bad image.
 203          * @return string
 204          */
 205         protected function wrapGalleryText( $galleryText, $thumb ) {
 206                 # ATTENTION: The newline after <div class="gallerytext"> is needed to
 207                 # accommodate htmltidy which in version 4.8.6 generated crackpot html in
 208                 # its absence, see: https://phabricator.wikimedia.org/T3765
 209                 # -Ævar
 210
 211                 return "\n\t\t\t" . '<div class="gallerytext">' . "\n"
 212                         . $galleryText
 213                         . "\n\t\t\t</div>";
 214         }
 215
 216         /**
 217          * How much padding such the thumb have between image and inner div that
 218          * that contains the border. This is both for verical and horizontal
 219          * padding. (However, it is cut in half in the vertical direction).
 220          * @return int
 221          */
 222         protected function getThumbPadding() {
 223                 return 30;
 224         }
 225
 226         /**
 227          * @note GB stands for gallerybox (as in the <li class="gallerybox"> element)
 228          *
 229          * @return int
 230          */
 231         protected function getGBPadding() {
 232                 return 5;
 233         }
 234
 235         /**
 236          * Get how much extra space the borders around the image takes up.
 237          *
 238          * For this mode, it is 2px borders on each side + 2px implied padding on
 239          * each side from the stylesheet, giving us 2*2+2*2 = 8.
 240          * @return int
 241          */
 242         protected function getGBBorders() {
 243                 return 8;
 244         }
 245
 246         /**
 247          * Get total padding.
 248          *
 249          * @return int Number of pixels of whitespace surrounding the thumbnail.
 250          */
 251         protected function getAllPadding() {
 252                 return $this->getThumbPadding() + $this->getGBPadding() + $this->getGBBorders();
 253         }
 254
 255         /**
 256          * Get vertical padding for a thumbnail
 257          *
 258          * Generally this is the total height minus how high the thumb is.
 259          *
 260          * @param int $boxHeight How high we want the box to be.
 261          * @param int $thumbHeight How high the thumbnail is.
 262          * @return int Vertical padding to add on each side.
 263          */
 264         protected function getVPad( $boxHeight, $thumbHeight ) {
 265                 return ( $this->getThumbPadding() + $boxHeight - $thumbHeight ) / 2;
 266         }
 267
 268         /**
 269          * Get the transform parameters for a thumbnail.
 270          *
 271          * @param File $img The file in question. May be false for invalid image
 272          * @return array
 273          */
 274         protected function getThumbParams( $img ) {
 275                 return array(
 276                         'width' => $this->mWidths,
 277                         'height' => $this->mHeights
 278                 );
 279         }
 280
 281         /**
 282          * Get the width of the inner div that contains the thumbnail in
 283          * question. This is the div with the class of "thumb".
 284          *
 285          * @param int $thumbWidth The width of the thumbnail.
 286          * @return int Width of inner thumb div.
 287          */
 288         protected function getThumbDivWidth( $thumbWidth ) {
 289                 return $this->mWidths + $this->getThumbPadding();
 290         }
 291
 292         /**
 293          * Width of gallerybox <li>.
 294          *
 295          * Generally is the width of the image, plus padding on image
 296          * plus padding on gallerybox.
 297          *
 298          * @note Important: parameter will be false if no thumb used.
 299          * @param MediaTransformOutput|bool $thumb MediaTransformObject object or false.
 300          * @return int Width of gallerybox element
 301          */
 302         protected function getGBWidth( $thumb ) {
 303                 return $this->mWidths + $this->getThumbPadding() + $this->getGBPadding();
 304         }
 305
 306         /**
 307          * Get a list of modules to include in the page.
 308          *
 309          * Primarily intended for subclasses.
 310          *
 311          * @return array Modules to include
 312          */
 313         protected function getModules() {
 314                 return array();
 315         }
 316
 317         /**
 318          * Adjust the image parameters for a thumbnail.
 319          *
 320          * Used by a subclass to insert extra high resolution images.
 321          * @param MediaTransformOutput $thumb The thumbnail
 322          * @param array $imageParameters Array of options
 323          */
 324         protected function adjustImageParameters( $thumb, &$imageParameters ) {
 325         }
 326 }
 327
 328 /**
 329  * Backwards compatibility. This always uses traditional mode
 330  * if called the old way, for extensions that may expect traditional
 331  * mode.
 332  *
 333  * @deprecated since 1.22 Use ImageGalleryBase::factory instead.
 334  */
 335 class ImageGallery extends TraditionalImageGallery {
 336         function __construct( $mode = 'traditional' ) {
 337                 wfDeprecated( __METHOD__, '1.22' );
 338                 parent::__construct( $mode );
 339         }
 340 }