includes/ImagePage.php

   1 <?php
   2
   3 if ( !defined( 'MEDIAWIKI' ) )
   4         die( 1 );
   5
   6 /**
   7  * Special handling for image description pages
   8  *
   9  * @ingroup Media
  10  */
  11 class ImagePage extends Article {
  12
  13         /* private */ var $img;  // Image object
  14         /* private */ var $displayImg;
  15         /* private */ var $repo;
  16         /* private */ var $fileLoaded;
  17         var $mExtraDescription = false;
  18         var $dupes;
  19
  20         function __construct( $title ) {
  21                 parent::__construct( $title );
  22                 $this->dupes = null;
  23                 $this->repo = null;
  24         }
  25
  26         /**
  27          * @param  $file File:
  28          * @return void
  29          */
  30         public function setFile( $file ) {
  31                 $this->displayImg = $file;
  32                 $this->img = $file;
  33                 $this->fileLoaded = true;
  34         }
  35
  36         protected function loadFile() {
  37                 if ( $this->fileLoaded ) {
  38                         return true;
  39                 }
  40                 $this->fileLoaded = true;
  41
  42                 $this->displayImg = $this->img = false;
  43                 wfRunHooks( 'ImagePageFindFile', array( $this, &$this->img, &$this->displayImg ) );
  44                 if ( !$this->img ) {
  45                         $this->img = wfFindFile( $this->mTitle );
  46                         if ( !$this->img ) {
  47                                 $this->img = wfLocalFile( $this->mTitle );
  48                         }
  49                 }
  50                 if ( !$this->displayImg ) {
  51                         $this->displayImg = $this->img;
  52                 }
  53                 $this->repo = $this->img->getRepo();
  54         }
  55
  56         /**
  57          * Handler for action=render
  58          * Include body text only; none of the image extras
  59          */
  60         public function render() {
  61                 global $wgOut;
  62                 $wgOut->setArticleBodyOnly( true );
  63                 parent::view();
  64         }
  65
  66         public function view() {
  67                 global $wgOut, $wgShowEXIF, $wgRequest, $wgUser;
  68
  69                 $diff = $wgRequest->getVal( 'diff' );
  70                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
  71
  72                 if ( $this->mTitle->getNamespace() != NS_FILE || ( isset( $diff ) && $diffOnly ) ) {
  73                         return parent::view();
  74                 }
  75
  76                 $this->loadFile();
  77
  78                 if ( $this->mTitle->getNamespace() == NS_FILE && $this->img->getRedirected() ) {
  79                         if ( $this->mTitle->getDBkey() == $this->img->getName() || isset( $diff ) ) {
  80                                 // mTitle is the same as the redirect target so ask Article
  81                                 // to perform the redirect for us.
  82                                 $wgRequest->setVal( 'diffonly', 'true' );
  83                                 return parent::view();
  84                         } else {
  85                                 // mTitle is not the same as the redirect target so it is
  86                                 // probably the redirect page itself. Fake the redirect symbol
  87                                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
  88                                 $wgOut->addHTML( $this->viewRedirect( Title::makeTitle( NS_FILE, $this->img->getName() ),
  89                                         /* $appendSubtitle */ true, /* $forceKnown */ true ) );
  90                                 $this->viewUpdates();
  91                                 return;
  92                         }
  93                 }
  94
  95                 $this->showRedirectedFromHeader();
  96
  97                 if ( $wgShowEXIF && $this->displayImg->exists() ) {
  98                         // FIXME: bad interface, see note on MediaHandler::formatMetadata().
  99                         $formattedMetadata = $this->displayImg->formatMetadata();
 100                         $showmeta = $formattedMetadata !== false;
 101                 } else {
 102                         $showmeta = false;
 103                 }
 104
 105                 if ( !$diff && $this->displayImg->exists() )
 106                         $wgOut->addHTML( $this->showTOC( $showmeta ) );
 107
 108                 if ( !$diff )
 109                         $this->openShowImage();
 110
 111                 # No need to display noarticletext, we use our own message, output in openShowImage()
 112                 if ( $this->getID() ) {
 113                         parent::view();
 114                 } else {
 115                         # Just need to set the right headers
 116                         $wgOut->setArticleFlag( true );
 117                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 118                         $this->viewUpdates();
 119                 }
 120
 121                 # Show shared description, if needed
 122                 if ( $this->mExtraDescription ) {
 123                         $fol = wfMessage( 'shareddescriptionfollows' );
 124                         if ( !$fol->isDisabled() ) {
 125                                 $wgOut->addWikiText( $fol->plain() );
 126                         }
 127                         $wgOut->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 128                 }
 129
 130                 $this->closeShowImage();
 131                 $this->imageHistory();
 132                 // TODO: Cleanup the following
 133
 134                 $wgOut->addHTML( Xml::element( 'h2',
 135                         array( 'id' => 'filelinks' ),
 136                         wfMsg( 'imagelinks' ) ) . "\n" );
 137                 $this->imageDupes();
 138                 # TODO! FIXME! For some freaky reason, we can't redirect to foreign images.
 139                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 140                 $this->imageRedirects();
 141                 $this->imageLinks();
 142
 143                 # Allow extensions to add something after the image links
 144                 $html = '';
 145                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 146                 if ( $html )
 147                         $wgOut->addHTML( $html );
 148
 149                 if ( $showmeta ) {
 150                         $wgOut->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 151                         $wgOut->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 152                         $wgOut->addModules( array( 'mediawiki.legacy.metadata' ) );
 153                 }
 154
 155                 $css = $this->repo->getDescriptionStylesheetUrl();
 156                 if ( $css ) {
 157                         $wgOut->addStyle( $css );
 158                 }
 159         }
 160
 161         public function getRedirectTarget() {
 162                 $this->loadFile();
 163                 if ( $this->img->isLocal() ) {
 164                         return parent::getRedirectTarget();
 165                 }
 166                 // Foreign image page
 167                 $from = $this->img->getRedirected();
 168                 $to = $this->img->getName();
 169                 if ( $from == $to ) {
 170                         return null;
 171                 }
 172                 return $this->mRedirectTarget = Title::makeTitle( NS_FILE, $to );
 173         }
 174         public function followRedirect() {
 175                 $this->loadFile();
 176                 if ( $this->img->isLocal() ) {
 177                         return parent::followRedirect();
 178                 }
 179                 $from = $this->img->getRedirected();
 180                 $to = $this->img->getName();
 181                 if ( $from == $to ) {
 182                         return false;
 183                 }
 184                 return Title::makeTitle( NS_FILE, $to );
 185         }
 186         public function isRedirect( $text = false ) {
 187                 $this->loadFile();
 188                 if ( $this->img->isLocal() )
 189                         return parent::isRedirect( $text );
 190
 191                 return (bool)$this->img->getRedirected();
 192         }
 193
 194         public function isLocal() {
 195                 $this->loadFile();
 196                 return $this->img->isLocal();
 197         }
 198
 199         public function getFile() {
 200                 $this->loadFile();
 201                 return $this->img;
 202         }
 203
 204         public function getDisplayedFile() {
 205                 $this->loadFile();
 206                 return $this->displayImg;
 207         }
 208
 209         public function getDuplicates() {
 210                 $this->loadFile();
 211                 if ( !is_null( $this->dupes ) ) {
 212                         return $this->dupes;
 213                 }
 214                 if ( !( $hash = $this->img->getSha1() ) ) {
 215                         return $this->dupes = array();
 216                 }
 217                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 218                 // Remove duplicates with self and non matching file sizes
 219                 $self = $this->img->getRepoName() . ':' . $this->img->getName();
 220                 $size = $this->img->getSize();
 221                 foreach ( $dupes as $index => $file ) {
 222                         $key = $file->getRepoName() . ':' . $file->getName();
 223                         if ( $key == $self )
 224                                 unset( $dupes[$index] );
 225                         if ( $file->getSize() != $size )
 226                                 unset( $dupes[$index] );
 227                 }
 228                 return $this->dupes = $dupes;
 229
 230         }
 231
 232
 233         /**
 234          * Create the TOC
 235          *
 236          * @param $metadata Boolean: whether or not to show the metadata link
 237          * @return String
 238          */
 239         protected function showTOC( $metadata ) {
 240                 $r = array(
 241                                 '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 242                                 '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 243                                 '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 244                 );
 245                 if ( $metadata ) {
 246                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 247                 }
 248
 249                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 250
 251                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 252         }
 253
 254         /**
 255          * Make a table with metadata to be shown in the output page.
 256          *
 257          * FIXME: bad interface, see note on MediaHandler::formatMetadata().
 258          *
 259          * @param $metadata Array: the array containing the EXIF data
 260          * @return String
 261          */
 262         protected function makeMetadataTable( $metadata ) {
 263                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 264                 $r .= wfMsgNoTrans( 'metadata-help' );
 265                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 266                 foreach ( $metadata as $type => $stuff ) {
 267                         foreach ( $stuff as $v ) {
 268                                 # FIXME, why is this using escapeId for a class?!
 269                                 $class = Sanitizer::escapeId( $v['id'] );
 270                                 if ( $type == 'collapsed' ) {
 271                                         $class .= ' collapsable';
 272                                 }
 273                                 $r .= "<tr class=\"$class\">\n";
 274                                 $r .= "<th>{$v['name']}</th>\n";
 275                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 276                         }
 277                 }
 278                 $r .= "</table>\n</div>\n";
 279                 return $r;
 280         }
 281
 282         /**
 283          * Overloading Article's getContent method.
 284          *
 285          * Omit noarticletext if sharedupload; text will be fetched from the
 286          * shared upload server if possible.
 287          */
 288         public function getContent() {
 289                 $this->loadFile();
 290                 if ( $this->img && !$this->img->isLocal() && 0 == $this->getID() ) {
 291                         return '';
 292                 }
 293                 return parent::getContent();
 294         }
 295
 296         protected function openShowImage() {
 297                 global $wgOut, $wgUser, $wgImageLimits, $wgRequest,
 298                         $wgLang, $wgContLang, $wgEnableUploads;
 299
 300                 $this->loadFile();
 301
 302                 $sizeSel = intval( $wgUser->getOption( 'imagesize' ) );
 303                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 304                         $sizeSel = User::getDefaultOption( 'imagesize' );
 305
 306                         // The user offset might still be incorrect, specially if
 307                         // $wgImageLimits got changed (see bug #8858).
 308                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 309                                 // Default to the first offset in $wgImageLimits
 310                                 $sizeSel = 0;
 311                         }
 312                 }
 313                 $max = $wgImageLimits[$sizeSel];
 314                 $maxWidth = $max[0];
 315                 $maxHeight = $max[1];
 316                 $sk = $wgUser->getSkin();
 317                 $dirmark = $wgContLang->getDirMark();
 318
 319                 if ( $this->displayImg->exists() ) {
 320                         # image
 321                         $page = $wgRequest->getIntOrNull( 'page' );
 322                         if ( is_null( $page ) ) {
 323                                 $params = array();
 324                                 $page = 1;
 325                         } else {
 326                                 $params = array( 'page' => $page );
 327                         }
 328                         $width_orig = $this->displayImg->getWidth( $page );
 329                         $width = $width_orig;
 330                         $height_orig = $this->displayImg->getHeight( $page );
 331                         $height = $height_orig;
 332
 333                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 334
 335                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$wgOut ) );
 336
 337                         if ( $this->displayImg->allowInlineDisplay() ) {
 338                                 # image
 339
 340                                 # "Download high res version" link below the image
 341                                 # $msgsize = wfMsgHtml('file-info-size', $width_orig, $height_orig, $sk->formatSize( $this->displayImg->getSize() ), $mime );
 342                                 # We'll show a thumbnail of this image
 343                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 344                                         # Calculate the thumbnail size.
 345                                         # First case, the limiting factor is the width, not the height.
 346                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 347                                                 $height = round( $height * $maxWidth / $width );
 348                                                 $width = $maxWidth;
 349                                                 # Note that $height <= $maxHeight now.
 350                                         } else {
 351                                                 $newwidth = floor( $width * $maxHeight / $height );
 352                                                 $height = round( $height * $newwidth / $width );
 353                                                 $width = $newwidth;
 354                                                 # Note that $height <= $maxHeight now, but might not be identical
 355                                                 # because of rounding.
 356                                         }
 357                                         $msgbig  = wfMsgHtml( 'show-big-image' );
 358                                         $msgsmall = wfMsgExt( 'show-big-image-thumb', 'parseinline',
 359                                                 $wgLang->formatNum( $width ),
 360                                                 $wgLang->formatNum( $height )
 361                                         );
 362                                 } else {
 363                                         # Image is small enough to show full size on image page
 364                                         $msgsmall = wfMsgExt( 'file-nohires', array( 'parseinline' ) );
 365                                 }
 366
 367                                 $params['width'] = $width;
 368                                 $thumbnail = $this->displayImg->transform( $params );
 369
 370                                 $showLink = true;
 371                                 $anchorclose = "<br />" . $msgsmall;
 372
 373                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 374                                 if ( $isMulti ) {
 375                                         $wgOut->addHTML( '<table class="multipageimage"><tr><td>' );
 376                                 }
 377
 378                                 if ( $thumbnail ) {
 379                                         $options = array(
 380                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 381                                                 'file-link' => true,
 382                                         );
 383                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 384                                                 $thumbnail->toHtml( $options ) .
 385                                                 $anchorclose . "</div>\n" );
 386                                 }
 387
 388                                 if ( $isMulti ) {
 389                                         $count = $this->displayImg->pageCount();
 390
 391                                         if ( $page > 1 ) {
 392                                                 $label = $wgOut->parse( wfMsg( 'imgmultipageprev' ), false );
 393                                                 $link = $sk->link(
 394                                                         $this->mTitle,
 395                                                         $label,
 396                                                         array(),
 397                                                         array( 'page' => $page - 1 ),
 398                                                         array( 'known', 'noclasses' )
 399                                                 );
 400                                                 $thumb1 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 401                                                         array( 'page' => $page - 1 ) );
 402                                         } else {
 403                                                 $thumb1 = '';
 404                                         }
 405
 406                                         if ( $page < $count ) {
 407                                                 $label = wfMsg( 'imgmultipagenext' );
 408                                                 $link = $sk->link(
 409                                                         $this->mTitle,
 410                                                         $label,
 411                                                         array(),
 412                                                         array( 'page' => $page + 1 ),
 413                                                         array( 'known', 'noclasses' )
 414                                                 );
 415                                                 $thumb2 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 416                                                         array( 'page' => $page + 1 ) );
 417                                         } else {
 418                                                 $thumb2 = '';
 419                                         }
 420
 421                                         global $wgScript;
 422
 423                                         $formParams = array(
 424                                                 'name' => 'pageselector',
 425                                                 'action' => $wgScript,
 426                                                 'onchange' => 'document.pageselector.submit();',
 427                                         );
 428
 429                                         for ( $i = 1; $i <= $count; $i++ ) {
 430                                                 $options[] = Xml::option( $wgLang->formatNum( $i ), $i, $i == $page );
 431                                         }
 432                                         $select = Xml::tags( 'select',
 433                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 434                                                 implode( "\n", $options ) );
 435
 436                                         $wgOut->addHTML(
 437                                                 '</td><td><div class="multipageimagenavbox">' .
 438                                                 Xml::openElement( 'form', $formParams ) .
 439                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDbKey() ) .
 440                                                 wfMsgExt( 'imgmultigoto', array( 'parseinline', 'replaceafter' ), $select ) .
 441                                                 Xml::submitButton( wfMsg( 'imgmultigo' ) ) .
 442                                                 Xml::closeElement( 'form' ) .
 443                                                 "<hr />$thumb1\n$thumb2<br clear=\"all\" /></div></td></tr></table>"
 444                                         );
 445                                 }
 446                         } else {
 447                                 # if direct link is allowed but it's not a renderable image, show an icon.
 448                                 if ( $this->displayImg->isSafeFile() ) {
 449                                         $icon = $this->displayImg->iconThumb();
 450
 451                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 452                                         $icon->toHtml( array( 'file-link' => true ) ) .
 453                                         "</div>\n" );
 454                                 }
 455
 456                                 $showLink = true;
 457                         }
 458
 459
 460                         if ( $showLink ) {
 461                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 462                                 $linktext = $filename;
 463                                 if ( isset( $msgbig ) ) {
 464                                         $linktext = wfEscapeWikiText( $msgbig );
 465                                 }
 466                                 $medialink = "[[Media:$filename|$linktext]]";
 467
 468                                 if ( !$this->displayImg->isSafeFile() ) {
 469                                         $warning = wfMsgNoTrans( 'mediawarning' );
 470                                         $wgOut->addWikiText( <<<EOT
 471 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span>$dirmark <span class="fileInfo">$longDesc</span></div>
 472 <div class="mediaWarning">$warning</div>
 473 EOT
 474                                                 );
 475                                 } else {
 476                                         $wgOut->addWikiText( <<<EOT
 477 <div class="fullMedia">{$medialink}{$dirmark} <span class="fileInfo">$longDesc</span>
 478 </div>
 479 EOT
 480                                         );
 481                                 }
 482                         }
 483
 484                         if ( !$this->displayImg->isLocal() ) {
 485                                 $this->printSharedImageText();
 486                         }
 487                 } else {
 488                         # Image does not exist
 489                         if ( $wgEnableUploads && $wgUser->isAllowed( 'upload' ) ) {
 490                                 // Only show an upload link if the user can upload
 491                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 492                                 $nofile = array(
 493                                         'filepage-nofile-link',
 494                                         $uploadTitle->getFullUrl( array( 'wpDestFile' => $this->img->getName() ) )
 495                                 );
 496                         }
 497                         else
 498                         {
 499                                 $nofile = 'filepage-nofile';
 500                         }
 501                         // Note, if there is an image description page, but
 502                         // no image, then this setRobotPolicy is overriden
 503                         // by Article::View().
 504                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 505                         $wgOut->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 506                         if ( !$this->getID() ) {
 507                                 // If there is no image, no shared image, and no description page,
 508                                 // output a 404, to be consistent with articles.
 509                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 510                         }
 511                 }
 512         }
 513
 514         /**
 515          * Show a notice that the file is from a shared repository
 516          */
 517         protected function printSharedImageText() {
 518                 global $wgOut;
 519
 520                 $this->loadFile();
 521
 522                 $descUrl = $this->img->getDescriptionUrl();
 523                 $descText = $this->img->getDescriptionText();
 524
 525                 /* Add canonical to head if there is no local page for this shared file */
 526                 if( $descUrl && $this->getID() == 0 ) {
 527                         $wgOut->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 528                 }
 529
 530                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 531                 $repo = $this->img->getRepo()->getDisplayName();
 532
 533                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 534                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 535                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 536                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 537                 } else {
 538                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 539                 }
 540
 541                 if ( $descText ) {
 542                         $this->mExtraDescription = $descText;
 543                 }
 544         }
 545
 546         public function getUploadUrl() {
 547                 $this->loadFile();
 548                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 549                 return $uploadTitle->getFullUrl( array(
 550                         'wpDestFile' => $this->img->getName(),
 551                         'wpForReUpload' => 1
 552                  ) );
 553         }
 554
 555         /**
 556          * Print out the various links at the bottom of the image page, e.g. reupload,
 557          * external editing (and instructions link) etc.
 558          */
 559         protected function uploadLinksBox() {
 560                 global $wgUser, $wgOut, $wgEnableUploads, $wgUseExternalEditor;
 561
 562                 if ( !$wgEnableUploads ) { return; }
 563
 564                 $this->loadFile();
 565                 if ( !$this->img->isLocal() )
 566                         return;
 567
 568                 $sk = $wgUser->getSkin();
 569
 570                 $wgOut->addHTML( "<br /><ul>\n" );
 571
 572                 # "Upload a new version of this file" link
 573                 if ( UploadBase::userCanReUpload( $wgUser, $this->img->name ) ) {
 574                         $ulink = $sk->makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 575                         $wgOut->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 576                 }
 577
 578                 # External editing link
 579                 if ( $wgUseExternalEditor ) {
 580                         $elink = $sk->link(
 581                                 $this->mTitle,
 582                                 wfMsgHtml( 'edit-externally' ),
 583                                 array(),
 584                                 array(
 585                                         'action' => 'edit',
 586                                         'externaledit' => 'true',
 587                                         'mode' => 'file'
 588                                 ),
 589                                 array( 'known', 'noclasses' )
 590                         );
 591                         $wgOut->addHTML( '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' . wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) . "</small></li>\n" );
 592                 }
 593
 594                 $wgOut->addHTML( "</ul>\n" );
 595         }
 596
 597         protected function closeShowImage() { } # For overloading
 598
 599         /**
 600          * If the page we've just displayed is in the "Image" namespace,
 601          * we follow it with an upload history of the image and its usage.
 602          */
 603         protected function imageHistory() {
 604                 global $wgOut;
 605
 606                 $this->loadFile();
 607                 $pager = new ImageHistoryPseudoPager( $this );
 608                 $wgOut->addHTML( $pager->getBody() );
 609                 $wgOut->preventClickjacking( $pager->getPreventClickjacking() );
 610
 611                 $this->img->resetHistory(); // free db resources
 612
 613                 # Exist check because we don't want to show this on pages where an image
 614                 # doesn't exist along with the noimage message, that would suck. -ævar
 615                 if ( $this->img->exists() ) {
 616                         $this->uploadLinksBox();
 617                 }
 618         }
 619
 620         protected function imageLinks() {
 621                 global $wgUser, $wgOut, $wgLang;
 622
 623                 $limit = 100;
 624
 625                 $dbr = wfGetDB( DB_SLAVE );
 626
 627                 $res = $dbr->select(
 628                         array( 'imagelinks', 'page' ),
 629                         array( 'page_namespace', 'page_title' ),
 630                         array( 'il_to' => $this->mTitle->getDBkey(), 'il_from = page_id' ),
 631                         __METHOD__,
 632                         array( 'LIMIT' => $limit + 1 )
 633                 );
 634                 $count = $dbr->numRows( $res );
 635                 if ( $count == 0 ) {
 636                         $wgOut->wrapWikiMsg( Html::rawElement( 'div', array ( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ), 'nolinkstoimage' );
 637                         return;
 638                 }
 639
 640                 $wgOut->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 641                 if ( $count <= $limit - 1 ) {
 642                         $wgOut->addWikiMsg( 'linkstoimage', $count );
 643                 } else {
 644                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 645                         $wgOut->addWikiMsg( 'linkstoimage-more',
 646                                 $wgLang->formatNum( $limit ),
 647                                 $this->mTitle->getPrefixedDBkey()
 648                         );
 649                 }
 650
 651                 $wgOut->addHTML( Html::openElement( 'ul', array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n" );
 652                 $sk = $wgUser->getSkin();
 653                 $count = 0;
 654                 $elements = array();
 655                 foreach ( $res as $s ) {
 656                         $count++;
 657                         if ( $count <= $limit ) {
 658                                 // We have not yet reached the extra one that tells us there is more to fetch
 659                                 $elements[] =  $s;
 660                         }
 661                 }
 662
 663                 // Sort the list by namespace:title
 664                 usort ( $elements, array( $this, 'compare' ) );
 665
 666                 // Create links for every element
 667                 foreach( $elements as $element ) {
 668                         $link = $sk->linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 669                         $wgOut->addHTML( Html::rawElement(
 670                                                 'li',
 671                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 672                                                 $link
 673                                         ) . "\n"
 674                         );
 675
 676                 };
 677                 $wgOut->addHTML( Html::closeElement( 'ul' ) . "\n" );
 678                 $res->free();
 679
 680                 // Add a links to [[Special:Whatlinkshere]]
 681                 if ( $count > $limit ) {
 682                         $wgOut->addWikiMsg( 'morelinkstoimage', $this->mTitle->getPrefixedDBkey() );
 683                 }
 684                 $wgOut->addHTML( Html::closeElement( 'div' ) . "\n" );
 685         }
 686
 687         protected function imageRedirects() {
 688                 global $wgUser, $wgOut, $wgLang;
 689
 690                 $redirects = $this->getTitle()->getRedirectsHere( NS_FILE );
 691                 if ( count( $redirects ) == 0 ) return;
 692
 693                 $wgOut->addHTML( "<div id='mw-imagepage-section-redirectstofile'>\n" );
 694                 $wgOut->addWikiMsg( 'redirectstofile',
 695                         $wgLang->formatNum( count( $redirects ) )
 696                 );
 697                 $wgOut->addHTML( "<ul class='mw-imagepage-redirectstofile'>\n" );
 698
 699                 $sk = $wgUser->getSkin();
 700                 foreach ( $redirects as $title ) {
 701                         $link = $sk->link(
 702                                 $title,
 703                                 null,
 704                                 array(),
 705                                 array( 'redirect' => 'no' ),
 706                                 array( 'known', 'noclasses' )
 707                         );
 708                         $wgOut->addHTML( "<li>{$link}</li>\n" );
 709                 }
 710                 $wgOut->addHTML( "</ul></div>\n" );
 711
 712         }
 713
 714         protected function imageDupes() {
 715                 global $wgOut, $wgUser, $wgLang;
 716
 717                 $this->loadFile();
 718
 719                 $dupes = $this->getDuplicates();
 720                 if ( count( $dupes ) == 0 ) return;
 721
 722                 $wgOut->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 723                 $wgOut->addWikiMsg( 'duplicatesoffile',
 724                         $wgLang->formatNum( count( $dupes ) ), $this->mTitle->getDBkey()
 725                 );
 726                 $wgOut->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 727
 728                 $sk = $wgUser->getSkin();
 729                 foreach ( $dupes as $file ) {
 730                         $fromSrc = '';
 731                         if ( $file->isLocal() ) {
 732                                 $link = $sk->link(
 733                                         $file->getTitle(),
 734                                         null,
 735                                         array(),
 736                                         array(),
 737                                         array( 'known', 'noclasses' )
 738                                 );
 739                         } else {
 740                                 $link = $sk->makeExternalLink( $file->getDescriptionUrl(),
 741                                         $file->getTitle()->getPrefixedText() );
 742                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 743                         }
 744                         $wgOut->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 745                 }
 746                 $wgOut->addHTML( "</ul></div>\n" );
 747         }
 748
 749         /**
 750          * Delete the file, or an earlier version of it
 751          */
 752         public function delete() {
 753                 global $wgUploadMaintenance;
 754                 if ( $wgUploadMaintenance && $this->mTitle && $this->mTitle->getNamespace() == NS_FILE ) {
 755                         global $wgOut;
 756                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 757                         return;
 758                 }
 759
 760                 $this->loadFile();
 761                 if ( !$this->img->exists() || !$this->img->isLocal() || $this->img->getRedirected() ) {
 762                         // Standard article deletion
 763                         parent::delete();
 764                         return;
 765                 }
 766                 $deleter = new FileDeleteForm( $this->img );
 767                 $deleter->execute();
 768         }
 769
 770         /**
 771          * Revert the file to an earlier version
 772          */
 773         public function revert() {
 774                 $this->loadFile();
 775                 $reverter = new FileRevertForm( $this->img );
 776                 $reverter->execute();
 777         }
 778
 779         /**
 780          * Override handling of action=purge
 781          */
 782         public function doPurge() {
 783                 $this->loadFile();
 784                 if ( $this->img->exists() ) {
 785                         wfDebug( "ImagePage::doPurge purging " . $this->img->getName() . "\n" );
 786                         $update = new HTMLCacheUpdate( $this->mTitle, 'imagelinks' );
 787                         $update->doUpdate();
 788                         $this->img->upgradeRow();
 789                         $this->img->purgeCache();
 790                 } else {
 791                         wfDebug( "ImagePage::doPurge no image for " . $this->img->getName() . "; limiting purge to cache only\n" );
 792                         // even if the file supposedly doesn't exist, force any cached information
 793                         // to be updated (in case the cached information is wrong)
 794                         $this->img->purgeCache();
 795                 }
 796                 parent::doPurge();
 797         }
 798
 799         /**
 800          * Display an error with a wikitext description
 801          */
 802         function showError( $description ) {
 803                 global $wgOut;
 804                 $wgOut->setPageTitle( wfMsg( "internalerror" ) );
 805                 $wgOut->setRobotPolicy( "noindex,nofollow" );
 806                 $wgOut->setArticleRelated( false );
 807                 $wgOut->enableClientCache( false );
 808                 $wgOut->addWikiText( $description );
 809         }
 810
 811
 812         /**
 813          * Callback for usort() to do link sorts by (namespace, title)
 814          * Function copied from Title::compare()
 815          *
 816          * @param $a object page to compare with
 817          * @param $b object page to compare with
 818          * @return Integer: result of string comparison, or namespace comparison
 819          */
 820         protected function compare( $a, $b ) {
 821                 if ( $a->page_namespace == $b->page_namespace ) {
 822                         return strcmp( $a->page_title, $b->page_title );
 823                 } else {
 824                         return $a->page_namespace - $b->page_namespace;
 825                 }
 826         }
 827 }
 828
 829 /**
 830  * Builds the image revision log shown on image pages
 831  *
 832  * @ingroup Media
 833  */
 834 class ImageHistoryList {
 835
 836         protected $imagePage, $img, $skin, $title, $repo, $showThumb;
 837         protected $preventClickjacking = false;
 838
 839         public function __construct( $imagePage ) {
 840                 global $wgUser, $wgShowArchiveThumbnails;
 841                 $this->skin = $wgUser->getSkin();
 842                 $this->current = $imagePage->getFile();
 843                 $this->img = $imagePage->getDisplayedFile();
 844                 $this->title = $imagePage->getTitle();
 845                 $this->imagePage = $imagePage;
 846                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 847         }
 848
 849         public function getImagePage() {
 850                 return $this->imagePage;
 851         }
 852
 853         public function getSkin() {
 854                 return $this->skin;
 855         }
 856
 857         public function getFile() {
 858                 return $this->img;
 859         }
 860
 861         public function beginImageHistoryList( $navLinks = '' ) {
 862                 global $wgOut, $wgUser;
 863                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 864                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 865                         . $wgOut->parse( wfMsgNoTrans( 'filehist-help' ) )
 866                         . $navLinks . "\n"
 867                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 868                         . '<tr><td></td>'
 869                         . ( $this->current->isLocal() && ( $wgUser->isAllowed( 'delete' ) || $wgUser->isAllowed( 'deletedhistory' ) ) ? '<td></td>' : '' )
 870                         . '<th>' . wfMsgHtml( 'filehist-datetime' ) . '</th>'
 871                         . ( $this->showThumb ? '<th>' . wfMsgHtml( 'filehist-thumb' ) . '</th>' : '' )
 872                         . '<th>' . wfMsgHtml( 'filehist-dimensions' ) . '</th>'
 873                         . '<th>' . wfMsgHtml( 'filehist-user' ) . '</th>'
 874                         . '<th>' . wfMsgHtml( 'filehist-comment' ) . '</th>'
 875                         . "</tr>\n";
 876         }
 877
 878         public function endImageHistoryList( $navLinks = '' ) {
 879                 return "</table>\n$navLinks\n</div>\n";
 880         }
 881
 882         public function imageHistoryLine( $iscur, $file ) {
 883                 global $wgUser, $wgLang;
 884
 885                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 886                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 887                 $user = $file->getUser( 'id' );
 888                 $usertext = $file->getUser( 'text' );
 889                 $description = $file->getDescription();
 890
 891                 $local = $this->current->isLocal();
 892                 $row = $selected = '';
 893
 894                 // Deletion link
 895                 if ( $local && ( $wgUser->isAllowed( 'delete' ) || $wgUser->isAllowed( 'deletedhistory' ) ) ) {
 896                         $row .= '<td>';
 897                         # Link to remove from history
 898                         if ( $wgUser->isAllowed( 'delete' ) ) {
 899                                 $q = array( 'action' => 'delete' );
 900                                 if ( !$iscur )
 901                                         $q['oldimage'] = $img;
 902                                 $row .= $this->skin->link(
 903                                         $this->title,
 904                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
 905                                         array(), $q, array( 'known' )
 906                                 );
 907                         }
 908                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
 909                         $canHide = $wgUser->isAllowed( 'deleterevision' );
 910                         if ( $canHide || ( $wgUser->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
 911                                 if ( $wgUser->isAllowed( 'delete' ) ) {
 912                                         $row .= '<br />';
 913                                 }
 914                                 // If file is top revision or locked from this user, don't link
 915                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
 916                                         $del = $this->skin->revDeleteLinkDisabled( $canHide );
 917                                 } else {
 918                                         list( $ts, $name ) = explode( '!', $img, 2 );
 919                                         $query = array(
 920                                                 'type'   => 'oldimage',
 921                                                 'target' => $this->title->getPrefixedText(),
 922                                                 'ids'    => $ts,
 923                                         );
 924                                         $del = $this->skin->revDeleteLink( $query,
 925                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 926                                 }
 927                                 $row .= $del;
 928                         }
 929                         $row .= '</td>';
 930                 }
 931
 932                 // Reversion link/current indicator
 933                 $row .= '<td>';
 934                 if ( $iscur ) {
 935                         $row .= wfMsgHtml( 'filehist-current' );
 936                 } elseif ( $local && $wgUser->isLoggedIn() && $this->title->userCan( 'edit' ) ) {
 937                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
 938                                 $row .= wfMsgHtml( 'filehist-revert' );
 939                         } else {
 940                                 $row .= $this->skin->link(
 941                                         $this->title,
 942                                         wfMsgHtml( 'filehist-revert' ),
 943                                         array(),
 944                                         array(
 945                                                 'action' => 'revert',
 946                                                 'oldimage' => $img,
 947                                                 'wpEditToken' => $wgUser->editToken( $img )
 948                                         ),
 949                                         array( 'known', 'noclasses' )
 950                                 );
 951                         }
 952                 }
 953                 $row .= '</td>';
 954
 955                 // Date/time and image link
 956                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
 957                         $selected = "class='filehistory-selected'";
 958                 }
 959                 $row .= "<td $selected style='white-space: nowrap;'>";
 960                 if ( !$file->userCan( File::DELETED_FILE ) ) {
 961                         # Don't link to unviewable files
 962                         $row .= '<span class="history-deleted">' . $wgLang->timeAndDate( $timestamp, true ) . '</span>';
 963                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
 964                         $this->preventClickjacking();
 965                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
 966                         # Make a link to review the image
 967                         $url = $this->skin->link(
 968                                 $revdel,
 969                                 $wgLang->timeAndDate( $timestamp, true ),
 970                                 array(),
 971                                 array(
 972                                         'target' => $this->title->getPrefixedText(),
 973                                         'file' => $img,
 974                                         'token' => $wgUser->editToken( $img )
 975                                 ),
 976                                 array( 'known', 'noclasses' )
 977                         );
 978                         $row .= '<span class="history-deleted">' . $url . '</span>';
 979                 } else {
 980                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
 981                         $row .= Xml::element( 'a', array( 'href' => $url ), $wgLang->timeAndDate( $timestamp, true ) );
 982                 }
 983                 $row .= "</td>";
 984
 985                 // Thumbnail
 986                 if ( $this->showThumb ) {
 987                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
 988                 }
 989
 990                 // Image dimensions + size
 991                 $row .= '<td>';
 992                 $row .= htmlspecialchars( $file->getDimensionsString() );
 993                 $row .= " <span style='white-space: nowrap;'>(" . $this->skin->formatSize( $file->getSize() ) . ')</span>';
 994                 $row .= '</td>';
 995
 996                 // Uploading user
 997                 $row .= '<td>';
 998                 if ( $local ) {
 999                         // Hide deleted usernames
1000                         if ( $file->isDeleted( File::DELETED_USER ) ) {
1001                                 $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1002                         } else {
1003                                 $row .= $this->skin->userLink( $user, $usertext ) . " <span style='white-space: nowrap;'>" .
1004                                         $this->skin->userToolLinks( $user, $usertext ) . "</span>";
1005                         }
1006                 } else {
1007                         $row .= htmlspecialchars( $usertext );
1008                 }
1009                 $row .= '</td><td>';
1010
1011                 // Don't show deleted descriptions
1012                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1013                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span>';
1014                 } else {
1015                         $row .= $this->skin->commentBlock( $description, $this->title );
1016                 }
1017                 $row .= '</td>';
1018
1019                 $rowClass = null;
1020                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1021                 $classAttr = $rowClass ? " class='$rowClass'" : "";
1022
1023                 return "<tr{$classAttr}>{$row}</tr>\n";
1024         }
1025
1026         protected function getThumbForLine( $file ) {
1027                 global $wgLang;
1028
1029                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE ) && !$file->isDeleted( File::DELETED_FILE ) ) {
1030                         $params = array(
1031                                 'width' => '120',
1032                                 'height' => '120',
1033                         );
1034                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1035
1036                         $thumbnail = $file->transform( $params );
1037                         $options = array(
1038                                 'alt' => wfMsg( 'filehist-thumbtext',
1039                                         $wgLang->timeAndDate( $timestamp, true ),
1040                                         $wgLang->date( $timestamp, true ),
1041                                         $wgLang->time( $timestamp, true ) ),
1042                                 'file-link' => true,
1043                         );
1044
1045                         if ( !$thumbnail ) return wfMsgHtml( 'filehist-nothumb' );
1046
1047                         return $thumbnail->toHtml( $options );
1048                 } else {
1049                         return wfMsgHtml( 'filehist-nothumb' );
1050                 }
1051         }
1052
1053         protected function preventClickjacking( $enable = true ) {
1054                 $this->preventClickjacking = $enable;
1055         }
1056
1057         public function getPreventClickjacking() {
1058                 return $this->preventClickjacking;
1059         }
1060 }
1061
1062 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1063         protected $preventClickjacking = false;
1064
1065         function __construct( $imagePage ) {
1066                 parent::__construct();
1067                 $this->mImagePage = $imagePage;
1068                 $this->mTitle = clone ( $imagePage->getTitle() );
1069                 $this->mTitle->setFragment( '#filehistory' );
1070                 $this->mImg = null;
1071                 $this->mHist = array();
1072                 $this->mRange = array( 0, 0 ); // display range
1073         }
1074
1075         function getTitle() {
1076                 return $this->mTitle;
1077         }
1078
1079         function getQueryInfo() {
1080                 return false;
1081         }
1082
1083         function getIndexField() {
1084                 return '';
1085         }
1086
1087         function formatRow( $row ) {
1088                 return '';
1089         }
1090
1091         function getBody() {
1092                 $s = '';
1093                 $this->doQuery();
1094                 if ( count( $this->mHist ) ) {
1095                         $list = new ImageHistoryList( $this->mImagePage );
1096                         # Generate prev/next links
1097                         $navLink = $this->getNavigationBar();
1098                         $s = $list->beginImageHistoryList( $navLink );
1099                         // Skip rows there just for paging links
1100                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1101                                 $file = $this->mHist[$i];
1102                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1103                         }
1104                         $s .= $list->endImageHistoryList( $navLink );
1105
1106                         if ( $list->getPreventClickjacking() ) {
1107                                 $this->preventClickjacking();
1108                         }
1109                 }
1110                 return $s;
1111         }
1112
1113         function doQuery() {
1114                 if ( $this->mQueryDone ) return;
1115                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1116                 if ( !$this->mImg->exists() ) {
1117                         return;
1118                 }
1119                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1120                 if ( $this->mIsBackwards ) {
1121                         // Fetch the file history
1122                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1123                         // The current rev may not meet the offset/limit
1124                         $numRows = count( $this->mHist );
1125                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1126                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1127                         }
1128                 } else {
1129                         // The current rev may not meet the offset
1130                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1131                                 $this->mHist[] = $this->mImg;
1132                         }
1133                         // Old image versions (fetch extra row for nav links)
1134                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1135                         // Fetch the file history
1136                         $this->mHist = array_merge( $this->mHist,
1137                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1138                 }
1139                 $numRows = count( $this->mHist ); // Total number of query results
1140                 if ( $numRows ) {
1141                         # Index value of top item in the list
1142                         $firstIndex = $this->mIsBackwards ?
1143                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1144                         # Discard the extra result row if there is one
1145                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1146                                 if ( $this->mIsBackwards ) {
1147                                         # Index value of item past the index
1148                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1149                                         # Index value of bottom item in the list
1150                                         $lastIndex = $this->mHist[1]->getTimestamp();
1151                                         # Display range
1152                                         $this->mRange = array( 1, $numRows - 1 );
1153                                 } else {
1154                                         # Index value of item past the index
1155                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1156                                         # Index value of bottom item in the list
1157                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1158                                         # Display range
1159                                         $this->mRange = array( 0, $numRows - 2 );
1160                                 }
1161                         } else {
1162                                 # Setting indexes to an empty string means that they will be
1163                                 # omitted if they would otherwise appear in URLs. It just so
1164                                 # happens that this  is the right thing to do in the standard
1165                                 # UI, in all the relevant cases.
1166                                 $this->mPastTheEndIndex = '';
1167                                 # Index value of bottom item in the list
1168                                 $lastIndex = $this->mIsBackwards ?
1169                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1170                                 # Display range
1171                                 $this->mRange = array( 0, $numRows - 1 );
1172                         }
1173                 } else {
1174                         $firstIndex = '';
1175                         $lastIndex = '';
1176                         $this->mPastTheEndIndex = '';
1177                 }
1178                 if ( $this->mIsBackwards ) {
1179                         $this->mIsFirst = ( $numRows < $queryLimit );
1180                         $this->mIsLast = ( $this->mOffset == '' );
1181                         $this->mLastShown = $firstIndex;
1182                         $this->mFirstShown = $lastIndex;
1183                 } else {
1184                         $this->mIsFirst = ( $this->mOffset == '' );
1185                         $this->mIsLast = ( $numRows < $queryLimit );
1186                         $this->mLastShown = $lastIndex;
1187                         $this->mFirstShown = $firstIndex;
1188                 }
1189                 $this->mQueryDone = true;
1190         }
1191
1192         protected function preventClickjacking( $enable = true ) {
1193                 $this->preventClickjacking = $enable;
1194         }
1195
1196         public function getPreventClickjacking() {
1197                 return $this->preventClickjacking;
1198         }
1199
1200 }