includes/ImageGallery.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 if ( ! defined( 'MEDIAWIKI' ) )
  24         die( 1 );
  25
  26 /**
  27  * Image gallery
  28  *
  29  * Add images to the gallery using add(), then render that list to HTML using toHTML().
  30  *
  31  * @ingroup Media
  32  */
  33 class ImageGallery {
  34         var $mImages, $mShowBytes, $mShowFilename;
  35         var $mCaption = false;
  36
  37         /**
  38          * Hide blacklisted images?
  39          */
  40         var $mHideBadImages;
  41
  42         /**
  43          * Registered parser object for output callbacks
  44          * @var Parser
  45          */
  46         var $mParser;
  47
  48         /**
  49          * Contextual title, used when images are being screened
  50          * against the bad image list
  51          */
  52         protected $contextTitle = false;
  53
  54         protected $mAttribs = array();
  55
  56         /**
  57          * Fixed margins
  58          */
  59         const THUMB_PADDING = 30;
  60         const GB_PADDING = 5;
  61         // 2px borders on each side + 2px implied padding on each side
  62         const GB_BORDERS = 8;
  63
  64         /**
  65          * Create a new image gallery object.
  66          */
  67         function __construct() {
  68                 global $wgGalleryOptions;
  69                 $this->mImages = array();
  70                 $this->mShowBytes = $wgGalleryOptions['showBytes'];
  71                 $this->mShowFilename = true;
  72                 $this->mParser = false;
  73                 $this->mHideBadImages = false;
  74                 $this->mPerRow = $wgGalleryOptions['imagesPerRow'];
  75                 $this->mWidths = $wgGalleryOptions['imageWidth'];
  76                 $this->mHeights = $wgGalleryOptions['imageHeight'];
  77                 $this->mCaptionLength = $wgGalleryOptions['captionLength'];
  78         }
  79
  80         /**
  81          * Register a parser object
  82          *
  83          * @param $parser Parser
  84          */
  85         function setParser( $parser ) {
  86                 $this->mParser = $parser;
  87         }
  88
  89         /**
  90          * Set bad image flag
  91          */
  92         function setHideBadImages( $flag = true ) {
  93                 $this->mHideBadImages = $flag;
  94         }
  95
  96         /**
  97          * Set the caption (as plain text)
  98          *
  99          * @param $caption string Caption
 100          */
 101         function setCaption( $caption ) {
 102                 $this->mCaption = htmlspecialchars( $caption );
 103         }
 104
 105         /**
 106          * Set the caption (as HTML)
 107          *
 108          * @param $caption String: Caption
 109          */
 110         public function setCaptionHtml( $caption ) {
 111                 $this->mCaption = $caption;
 112         }
 113
 114         /**
 115          * Set how many images will be displayed per row.
 116          *
 117          * @param $num Integer >= 0; If perrow=0 the gallery layout will adapt to screensize
 118          * invalid numbers will be rejected
 119          */
 120         public function setPerRow( $num ) {
 121                 if ( $num >= 0 ) {
 122                         $this->mPerRow = (int)$num;
 123                 }
 124         }
 125
 126         /**
 127          * Set how wide each image will be, in pixels.
 128          *
 129          * @param $num Integer > 0; invalid numbers will be ignored
 130          */
 131         public function setWidths( $num ) {
 132                 if ( $num > 0 ) {
 133                         $this->mWidths = (int)$num;
 134                 }
 135         }
 136
 137         /**
 138          * Set how high each image will be, in pixels.
 139          *
 140          * @param $num Integer > 0; invalid numbers will be ignored
 141          */
 142         public function setHeights( $num ) {
 143                 if ( $num > 0 ) {
 144                         $this->mHeights = (int)$num;
 145                 }
 146         }
 147
 148         /**
 149          * Instruct the class to use a specific skin for rendering
 150          *
 151          * @param $skin Skin object
 152          * @deprecated since 1.18 Not used anymore
 153          */
 154         function useSkin( $skin ) {
 155                 wfDeprecated( __METHOD__, '1.18' );
 156                 /* no op */
 157         }
 158
 159         /**
 160          * Add an image to the gallery.
 161          *
 162          * @param $title Title object of the image that is added to the gallery
 163          * @param $html  String: Additional HTML text to be shown. The name and size of the image are always shown.
 164          * @param $alt   String: Alt text for the image
 165          * @param $link  String: Override image link (optional)
 166          */
 167         function add( $title, $html = '', $alt = '', $link = '') {
 168                 if ( $title instanceof File ) {
 169                         // Old calling convention
 170                         $title = $title->getTitle();
 171                 }
 172                 $this->mImages[] = array( $title, $html, $alt, $link );
 173                 wfDebug( 'ImageGallery::add ' . $title->getText() . "\n" );
 174         }
 175
 176         /**
 177          * Add an image at the beginning of the gallery.
 178          *
 179          * @param $title Title object of the image that is added to the gallery
 180          * @param $html  String: Additional HTML text to be shown. The name and size of the image are always shown.
 181          * @param $alt   String: Alt text for the image
 182          */
 183         function insert( $title, $html = '', $alt = '' ) {
 184                 if ( $title instanceof File ) {
 185                         // Old calling convention
 186                         $title = $title->getTitle();
 187                 }
 188                 array_unshift( $this->mImages, array( &$title, $html, $alt ) );
 189         }
 190
 191         /**
 192          * isEmpty() returns true if the gallery contains no images
 193          * @return bool
 194          */
 195         function isEmpty() {
 196                 return empty( $this->mImages );
 197         }
 198
 199         /**
 200          * Enable/Disable showing of the file size of an image in the gallery.
 201          * Enabled by default.
 202          *
 203          * @param $f Boolean: set to false to disable.
 204          */
 205         function setShowBytes( $f ) {
 206                 $this->mShowBytes = (bool)$f;
 207         }
 208
 209         /**
 210          * Enable/Disable showing of the filename of an image in the gallery.
 211          * Enabled by default.
 212          *
 213          * @param $f Boolean: set to false to disable.
 214          */
 215         function setShowFilename( $f ) {
 216                 $this->mShowFilename = (bool)$f;
 217         }
 218
 219         /**
 220          * Set arbitrary attributes to go on the HTML gallery output element.
 221          * Should be suitable for a <ul> element.
 222          *
 223          * Note -- if taking from user input, you should probably run through
 224          * Sanitizer::validateAttributes() first.
 225          *
 226          * @param $attribs Array of HTML attribute pairs
 227          */
 228         function setAttributes( $attribs ) {
 229                 $this->mAttribs = $attribs;
 230         }
 231
 232         /**
 233          * Return a HTML representation of the image gallery
 234          *
 235          * For each image in the gallery, display
 236          * - a thumbnail
 237          * - the image name
 238          * - the additional text provided when adding the image
 239          * - the size of the image
 240          *
 241          * @return string
 242          */
 243         function toHTML() {
 244                 global $wgLang;
 245
 246                 if ( $this->mPerRow > 0 ) {
 247                         $maxwidth = $this->mPerRow * ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING + self::GB_BORDERS );
 248                         $oldStyle = isset( $this->mAttribs['style'] ) ? $this->mAttribs['style'] : '';
 249                         # _width is ignored by any sane browser. IE6 doesn't know max-width so it uses _width instead
 250                         $this->mAttribs['style'] = "max-width: {$maxwidth}px;_width: {$maxwidth}px;" . $oldStyle;
 251                 }
 252
 253                 $attribs = Sanitizer::mergeAttributes(
 254                         array( 'class' => 'gallery' ), $this->mAttribs );
 255
 256                 $output = Xml::openElement( 'ul', $attribs );
 257                 if ( $this->mCaption ) {
 258                         $output .= "\n\t<li class='gallerycaption'>{$this->mCaption}</li>";
 259                 }
 260
 261                 $params = array(
 262                         'width' => $this->mWidths,
 263                         'height' => $this->mHeights
 264                 );
 265                 # Output each image...
 266                 foreach ( $this->mImages as $pair ) {
 267                         $nt = $pair[0];
 268                         $text = $pair[1]; # "text" means "caption" here
 269                         $alt = $pair[2];
 270                         $link = $pair[3];
 271
 272                         $descQuery = false;
 273                         if ( $nt->getNamespace() == NS_FILE ) {
 274                                 # Get the file...
 275                                 if ( $this->mParser instanceof Parser ) {
 276                                         # Give extensions a chance to select the file revision for us
 277                                         $options = array();
 278                                         wfRunHooks( 'BeforeParserFetchFileAndTitle',
 279                                                 array( $this->mParser, $nt, &$options, &$descQuery ) );
 280                                         # Fetch and register the file (file title may be different via hooks)
 281                                         list( $img, $nt ) = $this->mParser->fetchFileAndTitle( $nt, $options );
 282                                 } else {
 283                                         $img = wfFindFile( $nt );
 284                                 }
 285                         } else {
 286                                 $img = false;
 287                         }
 288
 289                         if( !$img ) {
 290                                 # We're dealing with a non-image, spit out the name and be done with it.
 291                                 $thumbhtml = "\n\t\t\t" . '<div style="height: ' . ( self::THUMB_PADDING + $this->mHeights ) . 'px;">'
 292                                         . htmlspecialchars( $nt->getText() ) . '</div>';
 293                         } elseif( $this->mHideBadImages && wfIsBadImage( $nt->getDBkey(), $this->getContextTitle() ) ) {
 294                                 # The image is blacklisted, just show it as a text link.
 295                                 $thumbhtml = "\n\t\t\t" . '<div style="height: ' . ( self::THUMB_PADDING + $this->mHeights ) . 'px;">' .
 296                                         Linker::link(
 297                                                 $nt,
 298                                                 htmlspecialchars( $nt->getText() ),
 299                                                 array(),
 300                                                 array(),
 301                                                 array( 'known', 'noclasses' )
 302                                         ) .
 303                                         '</div>';
 304                         } elseif( !( $thumb = $img->transform( $params ) ) ) {
 305                                 # Error generating thumbnail.
 306                                 $thumbhtml = "\n\t\t\t" . '<div style="height: ' . ( self::THUMB_PADDING + $this->mHeights ) . 'px;">'
 307                                         . htmlspecialchars( $img->getLastError() ) . '</div>';
 308                         } else {
 309                                 $vpad = ( self::THUMB_PADDING + $this->mHeights - $thumb->height ) /2;
 310
 311                                 $imageParameters = array(
 312                                         'desc-link' => true,
 313                                         'desc-query' => $descQuery,
 314                                         'alt' => $alt,
 315                                         'custom-url-link' => $link
 316                                 );
 317                                 # In the absence of both alt text and caption, fall back on providing screen readers with the filename as alt text
 318                                 if ( $alt == '' && $text == '' ) {
 319                                         $imageParameters['alt'] = $nt->getText();
 320                                 }
 321
 322                                 # Set both fixed width and min-height.
 323                                 $thumbhtml = "\n\t\t\t" .
 324                                         '<div class="thumb" style="width: ' . ( $this->mWidths + self::THUMB_PADDING ) . 'px;">'
 325                                         # Auto-margin centering for block-level elements. Needed now that we have video
 326                                         # handlers since they may emit block-level elements as opposed to simple <img> tags.
 327                                         # ref http://css-discuss.incutio.com/?page=CenteringBlockElement
 328                                         . '<div style="margin:' . $vpad . 'px auto;">'
 329                                         . $thumb->toHtml( $imageParameters ) . '</div></div>';
 330
 331                                 // Call parser transform hook
 332                                 if ( $this->mParser && $img->getHandler() ) {
 333                                         $img->getHandler()->parserTransformHook( $this->mParser, $img );
 334                                 }
 335                         }
 336
 337                         //TODO
 338                         // $linkTarget = Title::newFromText( $wgContLang->getNsText( MWNamespace::getUser() ) . ":{$ut}" );
 339                         // $ul = Linker::link( $linkTarget, $ut );
 340
 341                         if( $this->mShowBytes ) {
 342                                 if( $img ) {
 343                                         $fileSize = htmlspecialchars( $wgLang->formatSize( $img->getSize() ) );
 344                                 } else {
 345                                         $fileSize = wfMsgHtml( 'filemissing' );
 346                                 }
 347                                 $fileSize = "$fileSize<br />\n";
 348                         } else {
 349                                 $fileSize = '';
 350                         }
 351
 352                         $textlink = $this->mShowFilename ?
 353                                 Linker::link(
 354                                         $nt,
 355                                         htmlspecialchars( $wgLang->truncate( $nt->getText(), $this->mCaptionLength ) ),
 356                                         array(),
 357                                         array(),
 358                                         array( 'known', 'noclasses' )
 359                                 ) . "<br />\n" :
 360                                 '' ;
 361
 362                         # ATTENTION: The newline after <div class="gallerytext"> is needed to accommodate htmltidy which
 363                         # in version 4.8.6 generated crackpot html in its absence, see:
 364                         # http://bugzilla.wikimedia.org/show_bug.cgi?id=1765 -Ævar
 365
 366                         # Weird double wrapping (the extra div inside the li) needed due to FF2 bug
 367                         # Can be safely removed if FF2 falls completely out of existance
 368                         $output .=
 369                                 "\n\t\t" . '<li class="gallerybox" style="width: ' . ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING ) . 'px">'
 370                                         . '<div style="width: ' . ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING ) . 'px">'
 371                                         . $thumbhtml
 372                                         . "\n\t\t\t" . '<div class="gallerytext">' . "\n"
 373                                         . $textlink . $text . $fileSize
 374                                         . "\n\t\t\t</div>"
 375                                         . "\n\t\t</div></li>";
 376                 }
 377                 $output .= "\n</ul>";
 378
 379                 return $output;
 380         }
 381
 382         /**
 383          * @return Integer: number of images in the gallery
 384          */
 385         public function count() {
 386                 return count( $this->mImages );
 387         }
 388
 389         /**
 390          * Set the contextual title
 391          *
 392          * @param $title Title: contextual title
 393          */
 394         public function setContextTitle( $title ) {
 395                 $this->contextTitle = $title;
 396         }
 397
 398         /**
 399          * Get the contextual title, if applicable
 400          *
 401          * @return mixed Title or false
 402          */
 403         public function getContextTitle() {
 404                 return is_object( $this->contextTitle ) && $this->contextTitle instanceof Title
 405                         ? $this->contextTitle
 406                         : false;
 407         }
 408
 409 } //class