Current File : /www/varak.net/wiki.varak.net/includes/page/ImageHistoryPseudoPager.php
<?php
/**
* 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
*/
use Wikimedia\Timestamp\TimestampException;
class ImageHistoryPseudoPager extends ReverseChronologicalPager {
protected $preventClickjacking = false;
/**
* @var File
*/
protected $mImg;
/**
* @var Title
*/
protected $mTitle;
/**
* @since 1.14
* @var ImagePage
*/
public $mImagePage;
/**
* @since 1.14
* @var File[]
*/
public $mHist;
/**
* @since 1.14
* @var int[]
*/
public $mRange;
/**
* @param ImagePage $imagePage
*/
public function __construct( $imagePage ) {
parent::__construct( $imagePage->getContext() );
$this->mImagePage = $imagePage;
$this->mTitle = $imagePage->getTitle()->createFragmentTarget( 'filehistory' );
$this->mImg = null;
$this->mHist = [];
$this->mRange = [ 0, 0 ]; // display range
// Only display 10 revisions at once by default, otherwise the list is overwhelming
$this->mLimitsShown = array_merge( [ 10 ], $this->mLimitsShown );
$this->mDefaultLimit = 10;
list( $this->mLimit, /* $offset */ ) =
$this->mRequest->getLimitOffset( $this->mDefaultLimit, '' );
}
/**
* @return Title
*/
public function getTitle() {
return $this->mTitle;
}
public function getQueryInfo() {
return false;
}
/**
* @return string
*/
public function getIndexField() {
return '';
}
/**
* @param object $row
* @return string
*/
public function formatRow( $row ) {
return '';
}
/**
* @return string
*/
public function getBody() {
$s = '';
$this->doQuery();
if ( count( $this->mHist ) ) {
if ( $this->mImg->isLocal() ) {
// Do a batch existence check for user pages and talkpages
$linkBatch = new LinkBatch();
for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
$file = $this->mHist[$i];
$user = $file->getUser( 'text' );
$linkBatch->add( NS_USER, $user );
$linkBatch->add( NS_USER_TALK, $user );
}
$linkBatch->execute();
}
$list = new ImageHistoryList( $this->mImagePage );
# Generate prev/next links
$navLink = $this->getNavigationBar();
$s = $list->beginImageHistoryList( $navLink );
// Skip rows there just for paging links
for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
$file = $this->mHist[$i];
$s .= $list->imageHistoryLine( !$file->isOld(), $file );
}
$s .= $list->endImageHistoryList( $navLink );
if ( $list->getPreventClickjacking() ) {
$this->preventClickjacking();
}
}
return $s;
}
public function doQuery() {
if ( $this->mQueryDone ) {
return;
}
$this->mImg = $this->mImagePage->getPage()->getFile(); // ensure loading
if ( !$this->mImg->exists() ) {
return;
}
// Make sure the date (probably from user input) is valid; if not, drop it.
if ( $this->mOffset !== null ) {
try {
$sadlyWeCannotPassThisTimestampDownTheStack = $this->mDb->timestamp( $this->mOffset );
} catch ( TimestampException $e ) {
$this->mOffset = null;
}
}
$queryLimit = $this->mLimit + 1; // limit plus extra row
if ( $this->mIsBackwards ) {
// Fetch the file history
$this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
// The current rev may not meet the offset/limit
$numRows = count( $this->mHist );
if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
$this->mHist = array_merge( [ $this->mImg ], $this->mHist );
}
} else {
// The current rev may not meet the offset
if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
$this->mHist[] = $this->mImg;
}
// Old image versions (fetch extra row for nav links)
$oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
// Fetch the file history
$this->mHist = array_merge( $this->mHist,
$this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
}
$numRows = count( $this->mHist ); // Total number of query results
if ( $numRows ) {
# Index value of top item in the list
$firstIndex = $this->mIsBackwards ?
$this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
# Discard the extra result row if there is one
if ( $numRows > $this->mLimit && $numRows > 1 ) {
if ( $this->mIsBackwards ) {
# Index value of item past the index
$this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
# Index value of bottom item in the list
$lastIndex = $this->mHist[1]->getTimestamp();
# Display range
$this->mRange = [ 1, $numRows - 1 ];
} else {
# Index value of item past the index
$this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
# Index value of bottom item in the list
$lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
# Display range
$this->mRange = [ 0, $numRows - 2 ];
}
} else {
# Setting indexes to an empty string means that they will be
# omitted if they would otherwise appear in URLs. It just so
# happens that this is the right thing to do in the standard
# UI, in all the relevant cases.
$this->mPastTheEndIndex = '';
# Index value of bottom item in the list
$lastIndex = $this->mIsBackwards ?
$this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
# Display range
$this->mRange = [ 0, $numRows - 1 ];
}
} else {
$firstIndex = '';
$lastIndex = '';
$this->mPastTheEndIndex = '';
}
if ( $this->mIsBackwards ) {
$this->mIsFirst = ( $numRows < $queryLimit );
$this->mIsLast = ( $this->mOffset == '' );
$this->mLastShown = $firstIndex;
$this->mFirstShown = $lastIndex;
} else {
$this->mIsFirst = ( $this->mOffset == '' );
$this->mIsLast = ( $numRows < $queryLimit );
$this->mLastShown = $lastIndex;
$this->mFirstShown = $firstIndex;
}
$this->mQueryDone = true;
}
/**
* @param bool $enable
*/
protected function preventClickjacking( $enable = true ) {
$this->preventClickjacking = $enable;
}
/**
* @return bool
*/
public function getPreventClickjacking() {
return $this->preventClickjacking;
}
}
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