includes/gallery/ImageGalleryBase.php

   1 <?php
   2 /**
   3  * Image gallery.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Image gallery
  25  *
  26  * Add images to the gallery using add(), then render that list to HTML using toHTML().
  27  *
  28  * @ingroup Media
  29  */
  30 abstract class ImageGalleryBase extends ContextSource {
  31         /** @var array Gallery images */
  32         protected $mImages;
  33
  34         /** @var bool Whether to show the filesize in bytes in categories */
  35         protected $mShowBytes;
  36
  37         /** @var bool Whether to show the filename. Default: true */
  38         protected $mShowFilename;
  39
  40         /** @var string Gallery mode. Default: traditional */
  41         protected $mMode;
  42
  43         /** @var bool|string Gallery caption. Default: false */
  44         protected $mCaption = false;
  45
  46         /**
  47          * @var bool Hide blacklisted images?
  48          */
  49         protected $mHideBadImages;
  50
  51         /**
  52          * @var Parser Registered parser object for output callbacks
  53          */
  54         protected $mParser;
  55
  56         /**
  57          * @var Title Contextual title, used when images are being screened against
  58          *   the bad image list
  59          */
  60         protected $contextTitle = false;
  61
  62         /** @var array */
  63         protected $mAttribs = array();
  64
  65         /** @var bool */
  66         static private $modeMapping = false;
  67
  68         /**
  69          * Get a new image gallery. This is the method other callers
  70          * should use to get a gallery.
  71          *
  72          * @param string|bool $mode Mode to use. False to use the default.
  73          * @throws MWException
  74          */
  75         static function factory( $mode = false ) {
  76                 global $wgGalleryOptions, $wgContLang;
  77                 self::loadModes();
  78                 if ( !$mode ) {
  79                         $mode = $wgGalleryOptions['mode'];
  80                 }
  81
  82                 $mode = $wgContLang->lc( $mode );
  83
  84                 if ( isset( self::$modeMapping[$mode] ) ) {
  85                         return new self::$modeMapping[$mode]( $mode );
  86                 } else {
  87                         throw new MWException( "No gallery class registered for mode $mode" );
  88                 }
  89         }
  90
  91         private static function loadModes() {
  92                 if ( self::$modeMapping === false ) {
  93                         self::$modeMapping = array(
  94                                 'traditional' => 'TraditionalImageGallery',
  95                                 'nolines' => 'NolinesImageGallery',
  96                                 'packed' => 'PackedImageGallery',
  97                                 'packed-hover' => 'PackedHoverImageGallery',
  98                                 'packed-overlay' => 'PackedOverlayImageGallery',
  99                         );
 100                         // Allow extensions to make a new gallery format.
 101                         wfRunHooks( 'GalleryGetModes', self::$modeMapping );
 102                 }
 103         }
 104
 105         /**
 106          * Create a new image gallery object.
 107          *
 108          * You should not call this directly, but instead use
 109          * ImageGalleryBase::factory().
 110          */
 111         function __construct( $mode = 'traditional' ) {
 112                 global $wgGalleryOptions;
 113                 $this->mImages = array();
 114                 $this->mShowBytes = $wgGalleryOptions['showBytes'];
 115                 $this->mShowFilename = true;
 116                 $this->mParser = false;
 117                 $this->mHideBadImages = false;
 118                 $this->mPerRow = $wgGalleryOptions['imagesPerRow'];
 119                 $this->mWidths = $wgGalleryOptions['imageWidth'];
 120                 $this->mHeights = $wgGalleryOptions['imageHeight'];
 121                 $this->mCaptionLength = $wgGalleryOptions['captionLength'];
 122                 $this->mMode = $mode;
 123         }
 124
 125         /**
 126          * Register a parser object. If you do not set this
 127          * and the output of this gallery ends up in parser
 128          * cache, the javascript will break!
 129          *
 130          * @note This also triggers using the page's target
 131          *  language instead of the user language.
 132          *
 133          * @param $parser Parser
 134          */
 135         function setParser( $parser ) {
 136                 $this->mParser = $parser;
 137         }
 138
 139         /**
 140          * Set bad image flag
 141          */
 142         function setHideBadImages( $flag = true ) {
 143                 $this->mHideBadImages = $flag;
 144         }
 145
 146         /**
 147          * Set the caption (as plain text)
 148          *
 149          * @param string $caption Caption
 150          */
 151         function setCaption( $caption ) {
 152                 $this->mCaption = htmlspecialchars( $caption );
 153         }
 154
 155         /**
 156          * Set the caption (as HTML)
 157          *
 158          * @param string $caption Caption
 159          */
 160         public function setCaptionHtml( $caption ) {
 161                 $this->mCaption = $caption;
 162         }
 163
 164         /**
 165          * Set how many images will be displayed per row.
 166          *
 167          * @param int $num Integer >= 0; If perrow=0 the gallery layout will adapt
 168          *   to screensize invalid numbers will be rejected
 169          */
 170         public function setPerRow( $num ) {
 171                 if ( $num >= 0 ) {
 172                         $this->mPerRow = (int)$num;
 173                 }
 174         }
 175
 176         /**
 177          * Set how wide each image will be, in pixels.
 178          *
 179          * @param int $num Integer > 0; invalid numbers will be ignored
 180          */
 181         public function setWidths( $num ) {
 182                 if ( $num > 0 ) {
 183                         $this->mWidths = (int)$num;
 184                 }
 185         }
 186
 187         /**
 188          * Set how high each image will be, in pixels.
 189          *
 190          * @param int $num Integer > 0; invalid numbers will be ignored
 191          */
 192         public function setHeights( $num ) {
 193                 if ( $num > 0 ) {
 194                         $this->mHeights = (int)$num;
 195                 }
 196         }
 197
 198         /**
 199          * Allow setting additional options. This is meant
 200          * to allow extensions to add additional parameters to
 201          * <gallery> parser tag.
 202          *
 203          * @param array $options Attributes of gallery tag.
 204          */
 205         public function setAdditionalOptions( $options ) {
 206         }
 207
 208         /**
 209          * Instruct the class to use a specific skin for rendering
 210          *
 211          * @param Skin $skin
 212          * @deprecated since 1.18 Not used anymore
 213          */
 214         function useSkin( $skin ) {
 215                 wfDeprecated( __METHOD__, '1.18' );
 216                 /* no op */
 217         }
 218
 219         /**
 220          * Add an image to the gallery.
 221          *
 222          * @param Title $title Title object of the image that is added to the gallery
 223          * @param string $html Additional HTML text to be shown. The name and size
 224          *   of the image are always shown.
 225          * @param string $alt Alt text for the image
 226          * @param string $link Override image link (optional)
 227          * @param array $handlerOpts Array of options for image handler (aka page number)
 228          */
 229         function add( $title, $html = '', $alt = '', $link = '', $handlerOpts = array() ) {
 230                 if ( $title instanceof File ) {
 231                         // Old calling convention
 232                         $title = $title->getTitle();
 233                 }
 234                 $this->mImages[] = array( $title, $html, $alt, $link, $handlerOpts );
 235                 wfDebug( 'ImageGallery::add ' . $title->getText() . "\n" );
 236         }
 237
 238         /**
 239          * Add an image at the beginning of the gallery.
 240          *
 241          * @param Title $title Title object of the image that is added to the gallery
 242          * @param string $html Additional HTML text to be shown. The name and size
 243          *   of the image are always shown.
 244          * @param string $alt Alt text for the image
 245          * @param string $link Override image link (optional)
 246          * @param array $handlerOpts Array of options for image handler (aka page number)
 247          */
 248         function insert( $title, $html = '', $alt = '', $link = '', $handlerOpts = array() ) {
 249                 if ( $title instanceof File ) {
 250                         // Old calling convention
 251                         $title = $title->getTitle();
 252                 }
 253                 array_unshift( $this->mImages, array( &$title, $html, $alt, $link, $handlerOpts ) );
 254         }
 255
 256         /**
 257          * isEmpty() returns true if the gallery contains no images
 258          * @return bool
 259          */
 260         function isEmpty() {
 261                 return empty( $this->mImages );
 262         }
 263
 264         /**
 265          * Enable/Disable showing of the file size of an image in the gallery.
 266          * Enabled by default.
 267          *
 268          * @param bool $f Set to false to disable.
 269          */
 270         function setShowBytes( $f ) {
 271                 $this->mShowBytes = (bool)$f;
 272         }
 273
 274         /**
 275          * Enable/Disable showing of the filename of an image in the gallery.
 276          * Enabled by default.
 277          *
 278          * @param bool $f Set to false to disable.
 279          */
 280         function setShowFilename( $f ) {
 281                 $this->mShowFilename = (bool)$f;
 282         }
 283
 284         /**
 285          * Set arbitrary attributes to go on the HTML gallery output element.
 286          * Should be suitable for a <ul> element.
 287          *
 288          * Note -- if taking from user input, you should probably run through
 289          * Sanitizer::validateAttributes() first.
 290          *
 291          * @param array $attribs Array of HTML attribute pairs
 292          */
 293         function setAttributes( $attribs ) {
 294                 $this->mAttribs = $attribs;
 295         }
 296
 297         /**
 298          * Display an html representation of the gallery
 299          *
 300          * @return string The html
 301          */
 302         abstract public function toHTML();
 303
 304         /**
 305          * @return int Number of images in the gallery
 306          */
 307         public function count() {
 308                 return count( $this->mImages );
 309         }
 310
 311         /**
 312          * Set the contextual title
 313          *
 314          * @param Title $title Contextual title
 315          */
 316         public function setContextTitle( $title ) {
 317                 $this->contextTitle = $title;
 318         }
 319
 320         /**
 321          * Get the contextual title, if applicable
 322          *
 323          * @return Title|bool Title or false
 324          */
 325         public function getContextTitle() {
 326                 return is_object( $this->contextTitle ) && $this->contextTitle instanceof Title
 327                         ? $this->contextTitle
 328                         : false;
 329         }
 330
 331         /**
 332          * Determines the correct language to be used for this image gallery
 333          * @return Language
 334          */
 335         protected function getRenderLang() {
 336                 return $this->mParser
 337                         ? $this->mParser->getTargetLanguage()
 338                         : $this->getLanguage();
 339         }
 340 }