includes/ImagePage.php

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