includes/ImageGallery.php

   1 <?php
   2 if ( ! defined( 'MEDIAWIKI' ) )
   3         die( 1 );
   4
   5 /**
   6  * Image gallery
   7  *
   8  * Add images to the gallery using add(), then render that list to HTML using toHTML().
   9  *
  10  * @ingroup Media
  11  */
  12 class ImageGallery
  13 {
  14         var $mImages, $mShowBytes, $mShowFilename;
  15         var $mCaption = false;
  16         var $mSkin = false;
  17
  18         /**
  19          * Hide blacklisted images?
  20          */
  21         var $mHideBadImages;
  22
  23         /**
  24          * Registered parser object for output callbacks
  25          * @var Parser
  26          */
  27         var $mParser;
  28
  29         /**
  30          * Contextual title, used when images are being screened
  31          * against the bad image list
  32          */
  33         private $contextTitle = false;
  34
  35         private $mAttribs = array();
  36
  37         /**
  38          * Fixed margins
  39          */
  40         const THUMB_PADDING = 30;
  41         const GB_PADDING = 5;
  42         const GB_BORDERS = 6;
  43
  44         /**
  45          * Create a new image gallery object.
  46          */
  47         function __construct( ) {
  48                 global $wgGalleryOptions;
  49                 $this->mImages = array();
  50                 $this->mShowBytes = $wgGalleryOptions['showBytes'];
  51                 $this->mShowFilename = true;
  52                 $this->mParser = false;
  53                 $this->mHideBadImages = false;
  54                 $this->mPerRow = $wgGalleryOptions['imagesPerRow'];
  55                 $this->mWidths = $wgGalleryOptions['imageWidth'];
  56                 $this->mHeights = $wgGalleryOptions['imageHeight'];
  57                 $this->mCaptionLength = $wgGalleryOptions['captionLength'];
  58         }
  59
  60         /**
  61          * Register a parser object
  62          */
  63         function setParser( $parser ) {
  64                 $this->mParser = $parser;
  65         }
  66
  67         /**
  68          * Set bad image flag
  69          */
  70         function setHideBadImages( $flag = true ) {
  71                 $this->mHideBadImages = $flag;
  72         }
  73
  74         /**
  75          * Set the caption (as plain text)
  76          *
  77          * @param $caption Caption
  78          */
  79         function setCaption( $caption ) {
  80                 $this->mCaption = htmlspecialchars( $caption );
  81         }
  82
  83         /**
  84          * Set the caption (as HTML)
  85          *
  86          * @param $caption String: Caption
  87          */
  88         public function setCaptionHtml( $caption ) {
  89                 $this->mCaption = $caption;
  90         }
  91
  92         /**
  93          * Set how many images will be displayed per row.
  94          *
  95          * @param $num Integer >= 0; If perrow=0 the gallery layout will adapt to screensize
  96          * invalid numbers will be rejected
  97          */
  98         public function setPerRow( $num ) {
  99                 if ($num >= 0) {
 100                         $this->mPerRow = (int)$num;
 101                 }
 102         }
 103
 104         /**
 105          * Set how wide each image will be, in pixels.
 106          *
 107          * @param $num Integer > 0; invalid numbers will be ignored
 108          */
 109         public function setWidths( $num ) {
 110                 if ($num > 0) {
 111                         $this->mWidths = (int)$num;
 112                 }
 113         }
 114
 115         /**
 116          * Set how high each image will be, in pixels.
 117          *
 118          * @param $num Integer > 0; invalid numbers will be ignored
 119          */
 120         public function setHeights( $num ) {
 121                 if ($num > 0) {
 122                         $this->mHeights = (int)$num;
 123                 }
 124         }
 125
 126         /**
 127          * Instruct the class to use a specific skin for rendering
 128          *
 129          * @param $skin Skin object
 130          */
 131         function useSkin( $skin ) {
 132                 $this->mSkin = $skin;
 133         }
 134
 135         /**
 136          * Return the skin that should be used
 137          *
 138          * @return Skin object
 139          */
 140         function getSkin() {
 141                 if( !$this->mSkin ) {
 142                         global $wgUser;
 143                         $skin = $wgUser->getSkin();
 144                 } else {
 145                         $skin = $this->mSkin;
 146                 }
 147                 return $skin;
 148         }
 149
 150         /**
 151          * Add an image to the gallery.
 152          *
 153          * @param $title Title object of the image that is added to the gallery
 154          * @param $html String: additional HTML text to be shown. The name and size of the image are always shown.
 155          */
 156         function add( $title, $html='' ) {
 157                 if ( $title instanceof File ) {
 158                         // Old calling convention
 159                         $title = $title->getTitle();
 160                 }
 161                 $this->mImages[] = array( $title, $html );
 162                 wfDebug( "ImageGallery::add " . $title->getText() . "\n" );
 163         }
 164
 165         /**
 166         * Add an image at the beginning of the gallery.
 167         *
 168         * @param $title Title object of the image that is added to the gallery
 169         * @param $html  String:  Additional HTML text to be shown. The name and size of the image are always shown.
 170         */
 171         function insert( $title, $html='' ) {
 172                 if ( $title instanceof File ) {
 173                         // Old calling convention
 174                         $title = $title->getTitle();
 175                 }
 176                 array_unshift( $this->mImages, array( &$title, $html ) );
 177         }
 178
 179
 180         /**
 181          * isEmpty() returns true if the gallery contains no images
 182          */
 183         function isEmpty() {
 184                 return empty( $this->mImages );
 185         }
 186
 187         /**
 188          * Enable/Disable showing of the file size of an image in the gallery.
 189          * Enabled by default.
 190          *
 191          * @param $f Boolean: set to false to disable.
 192          */
 193         function setShowBytes( $f ) {
 194                 $this->mShowBytes = (bool)$f;
 195         }
 196
 197         /**
 198          * Enable/Disable showing of the filename of an image in the gallery.
 199          * Enabled by default.
 200          *
 201          * @param $f Boolean: set to false to disable.
 202          */
 203         function setShowFilename( $f ) {
 204                 $this->mShowFilename = (bool)$f;
 205         }
 206
 207         /**
 208          * Set arbitrary attributes to go on the HTML gallery output element.
 209          * Should be suitable for a <ul> element.
 210          *
 211          * Note -- if taking from user input, you should probably run through
 212          * Sanitizer::validateAttributes() first.
 213          *
 214          * @param $attribs Array of HTML attribute pairs
 215          */
 216         function setAttributes( $attribs ) {
 217                 $this->mAttribs = $attribs;
 218         }
 219
 220         /**
 221          * Return a HTML representation of the image gallery
 222          *
 223          * For each image in the gallery, display
 224          * - a thumbnail
 225          * - the image name
 226          * - the additional text provided when adding the image
 227          * - the size of the image
 228          *
 229          */
 230         function toHTML() {
 231                 global $wgLang;
 232
 233                 $sk = $this->getSkin();
 234
 235                 if ( $this->mPerRow > 0 ) {
 236                         $maxwidth = $this->mPerRow * ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING + self::GB_BORDERS );
 237                         $oldStyle = isset( $this->mAttribs['style'] ) ? $this->mAttribs['style'] : "";
 238                         $this->mAttribs['style'] = "max-width: {$maxwidth}px;_width: {$maxwidth}px;" . $oldStyle;
 239                 }
 240
 241                 $attribs = Sanitizer::mergeAttributes(
 242                         array( 'class' => 'gallery' ), $this->mAttribs );
 243
 244                 $s = Xml::openElement( 'ul', $attribs );
 245                 if ( $this->mCaption ) {
 246                         $s .= "\n\t<li class='gallerycaption'>{$this->mCaption}</li>";
 247                 }
 248
 249                 $params = array( 'width' => $this->mWidths, 'height' => $this->mHeights );
 250                 # Output each image...
 251                 foreach ( $this->mImages as $pair ) {
 252                         $nt = $pair[0];
 253                         $text = $pair[1]; # "text" means "caption" here
 254
 255                         $descQuery = false;
 256                         if ( $nt->getNamespace() == NS_FILE ) {
 257                                 # Get the file...
 258                                 if ( $this->mParser instanceof Parser ) {
 259                                         # Give extensions a chance to select the file revision for us
 260                                         $time = $sha1 = false;
 261                                         wfRunHooks( 'BeforeParserFetchFileAndTitle',
 262                                                 array( $this->mParser, &$nt, &$time, &$sha1, &$descQuery ) );
 263                                         # Fetch and register the file (file title may be different via hooks)
 264                                         list( $img, $nt ) = $this->mParser->fetchFileAndTitle( $nt, $time, $sha1 );
 265                                 } else {
 266                                         $img = wfFindFile( $nt );
 267                                 }
 268                         } else {
 269                                 $img = false;
 270                         }
 271
 272                         if( !$img ) {
 273                                 # We're dealing with a non-image, spit out the name and be done with it.
 274                                 $thumbhtml = "\n\t\t\t".'<div style="height: '.(self::THUMB_PADDING + $this->mHeights).'px;">'
 275                                         . htmlspecialchars( $nt->getText() ) . '</div>';
 276                         } elseif( $this->mHideBadImages && wfIsBadImage( $nt->getDBkey(), $this->getContextTitle() ) ) {
 277                                 # The image is blacklisted, just show it as a text link.
 278                                 $thumbhtml = "\n\t\t\t".'<div style="height: '.(self::THUMB_PADDING + $this->mHeights).'px;">' .
 279                                         $sk->link(
 280                                                 $nt,
 281                                                 htmlspecialchars( $nt->getText() ),
 282                                                 array(),
 283                                                 array(),
 284                                                 array( 'known', 'noclasses' )
 285                                         ) .
 286                                         '</div>';
 287                         } elseif( !( $thumb = $img->transform( $params ) ) ) {
 288                                 # Error generating thumbnail.
 289                                 $thumbhtml = "\n\t\t\t".'<div style="height: '.(self::THUMB_PADDING + $this->mHeights).'px;">'
 290                                         . htmlspecialchars( $img->getLastError() ) . '</div>';
 291                         } else {
 292                                 //We get layout problems with the margin, if the image is smaller
 293                                 //than the line-height, so we less margin in these cases.
 294                                 $minThumbHeight =  $thumb->height > 17 ? $thumb->height : 17;
 295                                 $vpad = floor(( self::THUMB_PADDING + $this->mHeights - $minThumbHeight ) /2);
 296
 297
 298                                 $imageParameters = array(
 299                                         'desc-link' => true,
 300                                         'desc-query' => $descQuery
 301                                 );
 302                                 # In the absence of a caption, fall back on providing screen readers with the filename as alt text
 303                                 if ( $text == '' ) {
 304                                         $imageParameters['alt'] = $nt->getText();
 305                                 }
 306
 307                                 # Set both fixed width and min-height.
 308                                 $thumbhtml = "\n\t\t\t".
 309                                         '<div class="thumb" style="width: ' .($this->mWidths + self::THUMB_PADDING).'px;">'
 310                                         # Auto-margin centering for block-level elements. Needed now that we have video
 311                                         # handlers since they may emit block-level elements as opposed to simple <img> tags.
 312                                         # ref http://css-discuss.incutio.com/?page=CenteringBlockElement
 313                                         . '<div style="margin:'.$vpad.'px auto;">'
 314                                         . $thumb->toHtml( $imageParameters ) . '</div></div>';
 315
 316                                 // Call parser transform hook
 317                                 if ( $this->mParser && $img->getHandler() ) {
 318                                         $img->getHandler()->parserTransformHook( $this->mParser, $img );
 319                                 }
 320                         }
 321
 322                         //TODO
 323                         // $linkTarget = Title::newFromText( $wgContLang->getNsText( MWNamespace::getUser() ) . ":{$ut}" );
 324                         // $ul = $sk->link( $linkTarget, $ut );
 325
 326                         if( $this->mShowBytes ) {
 327                                 if( $img ) {
 328                                         $nb = wfMsgExt( 'nbytes', array( 'parsemag', 'escape'),
 329                                                 $wgLang->formatNum( $img->getSize() ) );
 330                                 } else {
 331                                         $nb = wfMsgHtml( 'filemissing' );
 332                                 }
 333                                 $nb = "$nb<br />\n";
 334                         } else {
 335                                 $nb = '';
 336                         }
 337
 338                         $textlink = $this->mShowFilename ?
 339                                 $sk->link(
 340                                         $nt,
 341                                         htmlspecialchars( $wgLang->truncate( $nt->getText(), $this->mCaptionLength ) ),
 342                                         array(),
 343                                         array(),
 344                                         array( 'known', 'noclasses' )
 345                                 ) . "<br />\n" :
 346                                 '' ;
 347
 348                         # ATTENTION: The newline after <div class="gallerytext"> is needed to accommodate htmltidy which
 349                         # in version 4.8.6 generated crackpot html in its absence, see:
 350                         # http://bugzilla.wikimedia.org/show_bug.cgi?id=1765 -Ævar
 351
 352                         # Weird double wrapping in div needed due to FF2 bug
 353                         # Can be safely removed if FF2 falls completely out of existance
 354                         $s .=
 355                                 "\n\t\t" . '<li class="gallerybox" style="width: ' . ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING ) . 'px">'
 356                                         . '<div style="width: ' . ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING ) . 'px">'
 357                                         . $thumbhtml
 358                                         . "\n\t\t\t" . '<div class="gallerytext">' . "\n"
 359                                                 . $textlink . $text . $nb
 360                                         . "\n\t\t\t</div>"
 361                                 . "\n\t\t</div></li>";
 362                 }
 363                 $s .= "\n</ul>";
 364
 365                 return $s;
 366         }
 367
 368         /**
 369          * @return Integer: number of images in the gallery
 370          */
 371         public function count() {
 372                 return count( $this->mImages );
 373         }
 374
 375         /**
 376          * Set the contextual title
 377          *
 378          * @param $title Title: contextual title
 379          */
 380         public function setContextTitle( $title ) {
 381                 $this->contextTitle = $title;
 382         }
 383
 384         /**
 385          * Get the contextual title, if applicable
 386          *
 387          * @return mixed Title or false
 388          */
 389         public function getContextTitle() {
 390                 return is_object( $this->contextTitle ) && $this->contextTitle instanceof Title
 391                                 ? $this->contextTitle
 392                                 : false;
 393         }
 394
 395 } //class