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<?php
/**
* Image gallery.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Image gallery
*
* Add images to the gallery using add(), then render that list to HTML using toHTML().
*
* @ingroup Media
*/
class ImageGallery {
var $mImages, $mShowBytes, $mShowFilename;
var $mCaption = false;
/**
* Hide blacklisted images?
*/
var $mHideBadImages;
/**
* Registered parser object for output callbacks
* @var Parser
*/
var $mParser;
/**
* Contextual title, used when images are being screened
* against the bad image list
*/
protected $contextTitle = false;
protected $mAttribs = array();
/**
* Fixed margins
*/
const THUMB_PADDING = 30;
const GB_PADDING = 5;
// 2px borders on each side + 2px implied padding on each side
const GB_BORDERS = 8;
/**
* Create a new image gallery object.
*/
function __construct() {
global $wgGalleryOptions;
$this->mImages = array();
$this->mShowBytes = $wgGalleryOptions['showBytes'];
$this->mShowFilename = true;
$this->mParser = false;
$this->mHideBadImages = false;
$this->mPerRow = $wgGalleryOptions['imagesPerRow'];
$this->mWidths = $wgGalleryOptions['imageWidth'];
$this->mHeights = $wgGalleryOptions['imageHeight'];
$this->mCaptionLength = $wgGalleryOptions['captionLength'];
}
/**
* Register a parser object
*
* @param $parser Parser
*/
function setParser( $parser ) {
$this->mParser = $parser;
}
/**
* Set bad image flag
*/
function setHideBadImages( $flag = true ) {
$this->mHideBadImages = $flag;
}
/**
* Set the caption (as plain text)
*
* @param string $caption Caption
*/
function setCaption( $caption ) {
$this->mCaption = htmlspecialchars( $caption );
}
/**
* Set the caption (as HTML)
*
* @param string $caption Caption
*/
public function setCaptionHtml( $caption ) {
$this->mCaption = $caption;
}
/**
* Set how many images will be displayed per row.
*
* @param $num Integer >= 0; If perrow=0 the gallery layout will adapt to screensize
* invalid numbers will be rejected
*/
public function setPerRow( $num ) {
if ( $num >= 0 ) {
$this->mPerRow = (int)$num;
}
}
/**
* Set how wide each image will be, in pixels.
*
* @param $num Integer > 0; invalid numbers will be ignored
*/
public function setWidths( $num ) {
if ( $num > 0 ) {
$this->mWidths = (int)$num;
}
}
/**
* Set how high each image will be, in pixels.
*
* @param $num Integer > 0; invalid numbers will be ignored
*/
public function setHeights( $num ) {
if ( $num > 0 ) {
$this->mHeights = (int)$num;
}
}
/**
* Instruct the class to use a specific skin for rendering
*
* @param $skin Skin object
* @deprecated since 1.18 Not used anymore
*/
function useSkin( $skin ) {
wfDeprecated( __METHOD__, '1.18' );
/* no op */
}
/**
* Add an image to the gallery.
*
* @param $title Title object of the image that is added to the gallery
* @param $html String: Additional HTML text to be shown. The name and size of the image are always shown.
* @param $alt String: Alt text for the image
* @param $link String: Override image link (optional)
*/
function add( $title, $html = '', $alt = '', $link = '' ) {
if ( $title instanceof File ) {
// Old calling convention
$title = $title->getTitle();
}
$this->mImages[] = array( $title, $html, $alt, $link );
wfDebug( 'ImageGallery::add ' . $title->getText() . "\n" );
}
/**
* Add an image at the beginning of the gallery.
*
* @param $title Title object of the image that is added to the gallery
* @param $html String: Additional HTML text to be shown. The name and size of the image are always shown.
* @param $alt String: Alt text for the image
*/
function insert( $title, $html = '', $alt = '' ) {
if ( $title instanceof File ) {
// Old calling convention
$title = $title->getTitle();
}
array_unshift( $this->mImages, array( &$title, $html, $alt ) );
}
/**
* isEmpty() returns true if the gallery contains no images
* @return bool
*/
function isEmpty() {
return empty( $this->mImages );
}
/**
* Enable/Disable showing of the file size of an image in the gallery.
* Enabled by default.
*
* @param $f Boolean: set to false to disable.
*/
function setShowBytes( $f ) {
$this->mShowBytes = (bool)$f;
}
/**
* Enable/Disable showing of the filename of an image in the gallery.
* Enabled by default.
*
* @param $f Boolean: set to false to disable.
*/
function setShowFilename( $f ) {
$this->mShowFilename = (bool)$f;
}
/**
* Set arbitrary attributes to go on the HTML gallery output element.
* Should be suitable for a <ul> element.
*
* Note -- if taking from user input, you should probably run through
* Sanitizer::validateAttributes() first.
*
* @param array $attribs of HTML attribute pairs
*/
function setAttributes( $attribs ) {
$this->mAttribs = $attribs;
}
/**
* Return a HTML representation of the image gallery
*
* For each image in the gallery, display
* - a thumbnail
* - the image name
* - the additional text provided when adding the image
* - the size of the image
*
* @return string
*/
function toHTML() {
if ( $this->mPerRow > 0 ) {
$maxwidth = $this->mPerRow * ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING + self::GB_BORDERS );
$oldStyle = isset( $this->mAttribs['style'] ) ? $this->mAttribs['style'] : '';
# _width is ignored by any sane browser. IE6 doesn't know max-width so it uses _width instead
$this->mAttribs['style'] = "max-width: {$maxwidth}px;_width: {$maxwidth}px;" . $oldStyle;
}
$attribs = Sanitizer::mergeAttributes(
array( 'class' => 'gallery' ), $this->mAttribs );
$output = Xml::openElement( 'ul', $attribs );
if ( $this->mCaption ) {
$output .= "\n\t<li class='gallerycaption'>{$this->mCaption}</li>";
}
$lang = $this->getLang();
$params = array(
'width' => $this->mWidths,
'height' => $this->mHeights
);
# Output each image...
foreach ( $this->mImages as $pair ) {
$nt = $pair[0];
$text = $pair[1]; # "text" means "caption" here
$alt = $pair[2];
$link = $pair[3];
$descQuery = false;
if ( $nt->getNamespace() == NS_FILE ) {
# Get the file...
if ( $this->mParser instanceof Parser ) {
# Give extensions a chance to select the file revision for us
$options = array();
wfRunHooks( 'BeforeParserFetchFileAndTitle',
array( $this->mParser, $nt, &$options, &$descQuery ) );
# Fetch and register the file (file title may be different via hooks)
list( $img, $nt ) = $this->mParser->fetchFileAndTitle( $nt, $options );
} else {
$img = wfFindFile( $nt );
}
} else {
$img = false;
}
if( !$img ) {
# We're dealing with a non-image, spit out the name and be done with it.
$thumbhtml = "\n\t\t\t" . '<div style="height: ' . ( self::THUMB_PADDING + $this->mHeights ) . 'px;">'
. htmlspecialchars( $nt->getText() ) . '</div>';
} elseif( $this->mHideBadImages && wfIsBadImage( $nt->getDBkey(), $this->getContextTitle() ) ) {
# The image is blacklisted, just show it as a text link.
$thumbhtml = "\n\t\t\t" . '<div style="height: ' . ( self::THUMB_PADDING + $this->mHeights ) . 'px;">' .
Linker::link(
$nt,
htmlspecialchars( $nt->getText() ),
array(),
array(),
array( 'known', 'noclasses' )
) .
'</div>';
} elseif( !( $thumb = $img->transform( $params ) ) ) {
# Error generating thumbnail.
$thumbhtml = "\n\t\t\t" . '<div style="height: ' . ( self::THUMB_PADDING + $this->mHeights ) . 'px;">'
. htmlspecialchars( $img->getLastError() ) . '</div>';
} else {
$vpad = ( self::THUMB_PADDING + $this->mHeights - $thumb->height ) /2;
$imageParameters = array(
'desc-link' => true,
'desc-query' => $descQuery,
'alt' => $alt,
'custom-url-link' => $link
);
# In the absence of both alt text and caption, fall back on providing screen readers with the filename as alt text
if ( $alt == '' && $text == '' ) {
$imageParameters['alt'] = $nt->getText();
}
# Set both fixed width and min-height.
$thumbhtml = "\n\t\t\t" .
'<div class="thumb" style="width: ' . ( $this->mWidths + self::THUMB_PADDING ) . 'px;">'
# Auto-margin centering for block-level elements. Needed now that we have video
# handlers since they may emit block-level elements as opposed to simple <img> tags.
# ref http://css-discuss.incutio.com/?page=CenteringBlockElement
. '<div style="margin:' . $vpad . 'px auto;">'
. $thumb->toHtml( $imageParameters ) . '</div></div>';
// Call parser transform hook
if ( $this->mParser && $img->getHandler() ) {
$img->getHandler()->parserTransformHook( $this->mParser, $img );
}
}
//TODO
// $linkTarget = Title::newFromText( $wgContLang->getNsText( MWNamespace::getUser() ) . ":{$ut}" );
// $ul = Linker::link( $linkTarget, $ut );
if( $this->mShowBytes ) {
if( $img ) {
$fileSize = htmlspecialchars( $lang->formatSize( $img->getSize() ) );
} else {
$fileSize = wfMessage( 'filemissing' )->escaped();
}
$fileSize = "$fileSize<br />\n";
} else {
$fileSize = '';
}
$textlink = $this->mShowFilename ?
Linker::link(
$nt,
htmlspecialchars( $lang->truncate( $nt->getText(), $this->mCaptionLength ) ),
array(),
array(),
array( 'known', 'noclasses' )
) . "<br />\n" :
'';
# ATTENTION: The newline after <div class="gallerytext"> is needed to accommodate htmltidy which
# in version 4.8.6 generated crackpot html in its absence, see:
# http://bugzilla.wikimedia.org/show_bug.cgi?id=1765 -Ævar
# Weird double wrapping (the extra div inside the li) needed due to FF2 bug
# Can be safely removed if FF2 falls completely out of existence
$output .=
"\n\t\t" . '<li class="gallerybox" style="width: ' . ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING ) . 'px">'
. '<div style="width: ' . ( $this->mWidths + self::THUMB_PADDING + self::GB_PADDING ) . 'px">'
. $thumbhtml
. "\n\t\t\t" . '<div class="gallerytext">' . "\n"
. $textlink . $text . $fileSize
. "\n\t\t\t</div>"
. "\n\t\t</div></li>";
}
$output .= "\n</ul>";
return $output;
}
/**
* @return Integer: number of images in the gallery
*/
public function count() {
return count( $this->mImages );
}
/**
* Set the contextual title
*
* @param $title Title: contextual title
*/
public function setContextTitle( $title ) {
$this->contextTitle = $title;
}
/**
* Get the contextual title, if applicable
*
* @return mixed Title or false
*/
public function getContextTitle() {
return is_object( $this->contextTitle ) && $this->contextTitle instanceof Title
? $this->contextTitle
: false;
}
/**
* Determines the correct language to be used for this image gallery
* @return Language object
*/
private function getLang() {
global $wgLang;
return $this->mParser
? $this->mParser->getTargetLanguage()
: $wgLang;
}
} //class