includes/MediaTransformOutput.php

   1 <?php
   2
   3 /**
   4  * Base class for the output of MediaHandler::doTransform() and File::transform().
   5  *
   6  * @addtogroup Media
   7  */
   8 abstract class MediaTransformOutput {
   9         var $file, $width, $height, $url, $page, $path;
  10
  11         /**
  12          * Get the width of the output box
  13          */
  14         function getWidth() {
  15                 return $this->width;
  16         }
  17
  18         /**
  19          * Get the height of the output box
  20          */
  21         function getHeight() {
  22                 return $this->height;
  23         }
  24
  25         /**
  26          * @return string The thumbnail URL
  27          */
  28         function getUrl() {
  29                 return $this->url;
  30         }
  31
  32         /**
  33          * @return string Destination file path (local filesystem)
  34          */
  35         function getPath() {
  36                 return $this->path;
  37         }
  38
  39         /**
  40          * Fetch HTML for this transform output
  41          *
  42          * @param array $options Associative array of options. Boolean options
  43          *     should be indicated with a value of true for true, and false or
  44          *     absent for false.
  45          *
  46          *     alt          Alternate text or caption
  47          *     desc-link    Boolean, show a description link
  48          *     file-link    Boolean, show a file download link
  49          *     valign       vertical-align property, if the output is an inline element
  50          *     img-class    Class applied to the <img> tag, if there is such a tag
  51          *
  52          * For images, desc-link and file-link are implemented as a click-through. For
  53          * sounds and videos, they may be displayed in other ways.
  54          *
  55          * @return string
  56          */
  57         abstract function toHtml( $options = array() );
  58
  59         /**
  60          * This will be overridden to return true in error classes
  61          */
  62         function isError() {
  63                 return false;
  64         }
  65
  66         /**
  67          * Wrap some XHTML text in an anchor tag with the given attributes
  68          */
  69         protected function linkWrap( $linkAttribs, $contents ) {
  70                 if ( $linkAttribs ) {
  71                         return Xml::tags( 'a', $linkAttribs, $contents );
  72                 } else {
  73                         return $contents;
  74                 }
  75         }
  76
  77         function getDescLinkAttribs( $alt = false ) {
  78                 $query = $this->page ? ( 'page=' . urlencode( $this->page ) ) : '';
  79                 $title = $this->file->getTitle();
  80                 if ( strval( $alt ) === '' ) {
  81                         $alt = $title->getText();
  82                 }
  83                 return array(
  84                         'href' => $this->file->getTitle()->getLocalURL( $query ),
  85                         'class' => 'image',
  86                         'title' => $alt
  87                 );
  88         }
  89 }
  90
  91
  92 /**
  93  * Media transform output for images
  94  *
  95  * @addtogroup Media
  96  */
  97 class ThumbnailImage extends MediaTransformOutput {
  98         /**
  99          * @param string $path Filesystem path to the thumb
 100          * @param string $url URL path to the thumb
 101          * @private
 102          */
 103         function ThumbnailImage( $file, $url, $width, $height, $path = false, $page = false ) {
 104                 $this->file = $file;
 105                 $this->url = $url;
 106                 # These should be integers when they get here.
 107                 # If not, there's a bug somewhere.  But let's at
 108                 # least produce valid HTML code regardless.
 109                 $this->width = round( $width );
 110                 $this->height = round( $height );
 111                 $this->path = $path;
 112                 $this->page = $page;
 113         }
 114
 115         /**
 116          * Return HTML <img ... /> tag for the thumbnail, will include
 117          * width and height attributes and a blank alt text (as required).
 118          *
 119          * @param array $options Associative array of options. Boolean options
 120          *     should be indicated with a value of true for true, and false or
 121          *     absent for false.
 122          *
 123          *     alt          Alternate text or caption
 124          *     desc-link    Boolean, show a description link
 125          *     file-link    Boolean, show a file download link
 126          *     valign       vertical-align property, if the output is an inline element
 127          *     img-class    Class applied to the <img> tag, if there is such a tag
 128          *
 129          * For images, desc-link and file-link are implemented as a click-through. For
 130          * sounds and videos, they may be displayed in other ways.
 131          *
 132          * @return string
 133          * @public
 134          */
 135         function toHtml( $options = array() ) {
 136                 if ( count( func_get_args() ) == 2 ) {
 137                         throw new MWException( __METHOD__ .' called in the old style' );
 138                 }
 139
 140                 $alt = empty( $options['alt'] ) ? '' : $options['alt'];
 141                 if ( !empty( $options['desc-link'] ) ) {
 142                         $linkAttribs = $this->getDescLinkAttribs( $alt );
 143                 } elseif ( !empty( $options['file-link'] ) ) {
 144                         $linkAttribs = array( 'href' => $this->file->getURL() );
 145                 } else {
 146                         $linkAttribs = false;
 147                 }
 148
 149                 $attribs = array(
 150                         'alt' => $alt,
 151                         'src' => $this->url,
 152                         'width' => $this->width,
 153                         'height' => $this->height,
 154                         'style' => 'border: none',
 155                 );
 156                 if ( !empty( $options['valign'] ) ) {
 157                         $attribs['style'] = "vertical-align: {$options['valign']}";
 158                 }
 159                 if ( !empty( $options['img-class'] ) ) {
 160                         $attribs['class'] = $options['img-class'];
 161                 }
 162                 return $this->linkWrap( $linkAttribs, Xml::element( 'img', $attribs ) );
 163         }
 164
 165 }
 166
 167 /**
 168  * Basic media transform error class
 169  *
 170  * @addtogroup Media
 171  */
 172 class MediaTransformError extends MediaTransformOutput {
 173         var $htmlMsg, $textMsg, $width, $height, $url, $path;
 174
 175         function __construct( $msg, $width, $height /*, ... */ ) {
 176                 $args = array_slice( func_get_args(), 3 );
 177                 $htmlArgs = array_map( 'htmlspecialchars', $args );
 178                 $htmlArgs = array_map( 'nl2br', $htmlArgs );
 179
 180                 $this->htmlMsg = wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $msg, true ) ), $htmlArgs );
 181                 $this->textMsg = wfMsgReal( $msg, $args );
 182                 $this->width = intval( $width );
 183                 $this->height = intval( $height );
 184                 $this->url = false;
 185                 $this->path = false;
 186         }
 187
 188         function toHtml( $options = array() ) {
 189                 return "<table class=\"MediaTransformError\" style=\"" .
 190                         "width: {$this->width}px; height: {$this->height}px;\"><tr><td>" .
 191                         $this->htmlMsg .
 192                         "</td></tr></table>";
 193         }
 194
 195         function toText() {
 196                 return $this->textMsg;
 197         }
 198
 199         function getHtmlMsg() {
 200                 return $this->htmlMsg;
 201         }
 202
 203         function isError() {
 204                 return true;
 205         }
 206 }
 207
 208 /**
 209  * Shortcut class for parameter validation errors
 210  *
 211  * @addtogroup Media
 212  */
 213 class TransformParameterError extends MediaTransformError {
 214         function __construct( $params ) {
 215                 parent::__construct( 'thumbnail_error',
 216                         max( isset( $params['width']  ) ? $params['width']  : 0, 180 ),
 217                         max( isset( $params['height'] ) ? $params['height'] : 0, 180 ),
 218                         wfMsg( 'thumbnail_invalid_params' ) );
 219         }
 220 }
 221
 222