3 * @defgroup Pager Pager
10 * Basic pager interface.
14 function getNavigationBar();
19 * IndexPager is an efficient pager which uses a (roughly unique) index in the
20 * data set to implement paging, rather than a "LIMIT offset,limit" clause.
21 * In MySQL, such a limit/offset clause requires counting through the
22 * specified number of offset rows to find the desired data, which can be
23 * expensive for large offsets.
25 * ReverseChronologicalPager is a child class of the abstract IndexPager, and
26 * contains some formatting and display code which is specific to the use of
27 * timestamps as indexes. Here is a synopsis of its operation:
29 * * The query is specified by the offset, limit and direction (dir)
30 * parameters, in addition to any subclass-specific parameters.
31 * * The offset is the non-inclusive start of the DB query. A row with an
32 * index value equal to the offset will never be shown.
33 * * The query may either be done backwards, where the rows are returned by
34 * the database in the opposite order to which they are displayed to the
35 * user, or forwards. This is specified by the "dir" parameter, dir=prev
36 * means backwards, anything else means forwards. The offset value
37 * specifies the start of the database result set, which may be either
38 * the start or end of the displayed data set. This allows "previous"
39 * links to be implemented without knowledge of the index value at the
40 * start of the previous page.
41 * * An additional row beyond the user-specified limit is always requested.
42 * This allows us to tell whether we should display a "next" link in the
43 * case of forwards mode, or a "previous" link in the case of backwards
44 * mode. Determining whether to display the other link (the one for the
45 * page before the start of the database result set) can be done
46 * heuristically by examining the offset.
48 * * An empty offset indicates that the offset condition should be omitted
49 * from the query. This naturally produces either the first page or the
50 * last page depending on the dir parameter.
52 * Subclassing the pager to implement concrete functionality should be fairly
53 * simple, please see the examples in HistoryPage.php and
54 * SpecialIpblocklist.php. You just need to override formatRow(),
55 * getQueryInfo() and getIndexField(). Don't forget to call the parent
56 * constructor if you override it.
60 abstract class IndexPager
implements Pager
{
62 public $mLimitsShown = array( 20, 50, 100, 250, 500 );
63 public $mDefaultLimit = 50;
64 public $mOffset, $mLimit;
65 public $mQueryDone = false;
67 public $mPastTheEndRow;
70 * The index to actually be used for ordering. This is a single string
71 * even if multiple orderings are supported.
73 protected $mIndexField;
74 /** For pages that support multiple types of ordering, which one to use.
76 protected $mOrderType;
78 * $mDefaultDirection gives the direction to use when sorting results:
79 * false for ascending, true for descending. If $mIsBackwards is set, we
80 * start from the opposite end, but we still sort the page itself according
81 * to $mDefaultDirection. E.g., if $mDefaultDirection is false but we're
82 * going backwards, we'll display the last page of results, but the last
83 * result will be at the bottom, not the top.
85 * Like $mIndexField, $mDefaultDirection will be a single value even if the
86 * class supports multiple default directions for different order types.
88 public $mDefaultDirection;
91 /** True if the current result set is the first one */
95 * Result object for the query. Warning: seek before use.
99 public function __construct() {
100 global $wgRequest, $wgUser;
101 $this->mRequest
= $wgRequest;
103 # NB: the offset is quoted, not validated. It is treated as an
104 # arbitrary string to support the widest variety of index types. Be
105 # careful outputting it into HTML!
106 $this->mOffset
= $this->mRequest
->getText( 'offset' );
108 # Use consistent behavior for the limit options
109 $this->mDefaultLimit
= intval( $wgUser->getOption( 'rclimit' ) );
110 list( $this->mLimit
, /* $offset */ ) = $this->mRequest
->getLimitOffset();
112 $this->mIsBackwards
= ( $this->mRequest
->getVal( 'dir' ) == 'prev' );
113 $this->mDb
= wfGetDB( DB_SLAVE
);
115 $index = $this->getIndexField();
116 $order = $this->mRequest
->getVal( 'order' );
117 if( is_array( $index ) && isset( $index[$order] ) ) {
118 $this->mOrderType
= $order;
119 $this->mIndexField
= $index[$order];
120 } elseif( is_array( $index ) ) {
121 # First element is the default
123 list( $this->mOrderType
, $this->mIndexField
) = each( $index );
125 # $index is not an array
126 $this->mOrderType
= null;
127 $this->mIndexField
= $index;
130 if( !isset( $this->mDefaultDirection
) ) {
131 $dir = $this->getDefaultDirections();
132 $this->mDefaultDirection
= is_array( $dir )
133 ?
$dir[$this->mOrderType
]
139 * Do the query, using information from the object context. This function
140 * has been kept minimal to make it overridable if necessary, to allow for
141 * result sets formed from multiple DB queries.
144 # Use the child class name for profiling
145 $fname = __METHOD__
. ' (' . get_class( $this ) . ')';
146 wfProfileIn( $fname );
148 $descending = ( $this->mIsBackwards
== $this->mDefaultDirection
);
149 # Plus an extra row so that we can tell the "next" link should be shown
150 $queryLimit = $this->mLimit +
1;
152 $this->mResult
= $this->reallyDoQuery(
157 $this->extractResultInfo( $this->mOffset
, $queryLimit, $this->mResult
);
158 $this->mQueryDone
= true;
160 $this->preprocessResults( $this->mResult
);
161 $this->mResult
->rewind(); // Paranoia
163 wfProfileOut( $fname );
167 * Return the result wrapper.
169 function getResult() {
170 return $this->mResult
;
174 * Set the offset from an other source than $wgRequest
176 function setOffset( $offset ) {
177 $this->mOffset
= $offset;
180 * Set the limit from an other source than $wgRequest
182 function setLimit( $limit ) {
183 $this->mLimit
= $limit;
187 * Extract some useful data from the result object for use by
188 * the navigation bar, put it into $this
190 function extractResultInfo( $offset, $limit, ResultWrapper
$res ) {
191 $numRows = $res->numRows();
193 $row = $res->fetchRow();
194 $firstIndex = $row[$this->mIndexField
];
196 # Discard the extra result row if there is one
197 if ( $numRows > $this->mLimit
&& $numRows > 1 ) {
198 $res->seek( $numRows - 1 );
199 $this->mPastTheEndRow
= $res->fetchObject();
200 $indexField = $this->mIndexField
;
201 $this->mPastTheEndIndex
= $this->mPastTheEndRow
->$indexField;
202 $res->seek( $numRows - 2 );
203 $row = $res->fetchRow();
204 $lastIndex = $row[$this->mIndexField
];
206 $this->mPastTheEndRow
= null;
207 # Setting indexes to an empty string means that they will be
208 # omitted if they would otherwise appear in URLs. It just so
209 # happens that this is the right thing to do in the standard
210 # UI, in all the relevant cases.
211 $this->mPastTheEndIndex
= '';
212 $res->seek( $numRows - 1 );
213 $row = $res->fetchRow();
214 $lastIndex = $row[$this->mIndexField
];
219 $this->mPastTheEndRow
= null;
220 $this->mPastTheEndIndex
= '';
223 if ( $this->mIsBackwards
) {
224 $this->mIsFirst
= ( $numRows < $limit );
225 $this->mIsLast
= ( $offset == '' );
226 $this->mLastShown
= $firstIndex;
227 $this->mFirstShown
= $lastIndex;
229 $this->mIsFirst
= ( $offset == '' );
230 $this->mIsLast
= ( $numRows < $limit );
231 $this->mLastShown
= $lastIndex;
232 $this->mFirstShown
= $firstIndex;
237 * Get some text to go in brackets in the "function name" part of the SQL comment
239 function getSqlComment() {
240 return get_class( $this );
244 * Do a query with specified parameters, rather than using the object
247 * @param string $offset Index offset, inclusive
248 * @param integer $limit Exact query limit
249 * @param boolean $descending Query direction, false for ascending, true for descending
250 * @return ResultWrapper
252 function reallyDoQuery( $offset, $limit, $descending ) {
253 $fname = __METHOD__
. ' (' . $this->getSqlComment() . ')';
254 $info = $this->getQueryInfo();
255 $tables = $info['tables'];
256 $fields = $info['fields'];
257 $conds = isset( $info['conds'] ) ?
$info['conds'] : array();
258 $options = isset( $info['options'] ) ?
$info['options'] : array();
259 $join_conds = isset( $info['join_conds'] ) ?
$info['join_conds'] : array();
261 $options['ORDER BY'] = $this->mIndexField
;
264 $options['ORDER BY'] = $this->mIndexField
. ' DESC';
267 if ( $offset != '' ) {
268 $conds[] = $this->mIndexField
. $operator . $this->mDb
->addQuotes( $offset );
270 $options['LIMIT'] = intval( $limit );
271 $res = $this->mDb
->select( $tables, $fields, $conds, $fname, $options, $join_conds );
272 return new ResultWrapper( $this->mDb
, $res );
276 * Pre-process results; useful for performing batch existence checks, etc.
278 * @param ResultWrapper $result Result wrapper
280 protected function preprocessResults( $result ) {}
283 * Get the formatted result list. Calls getStartBody(), formatRow() and
284 * getEndBody(), concatenates the results and returns them.
287 if ( !$this->mQueryDone
) {
290 # Don't use any extra rows returned by the query
291 $numRows = min( $this->mResult
->numRows(), $this->mLimit
);
293 $s = $this->getStartBody();
295 if ( $this->mIsBackwards
) {
296 for ( $i = $numRows - 1; $i >= 0; $i-- ) {
297 $this->mResult
->seek( $i );
298 $row = $this->mResult
->fetchObject();
299 $s .= $this->formatRow( $row );
302 $this->mResult
->seek( 0 );
303 for ( $i = 0; $i < $numRows; $i++
) {
304 $row = $this->mResult
->fetchObject();
305 $s .= $this->formatRow( $row );
309 $s .= $this->getEmptyBody();
311 $s .= $this->getEndBody();
318 function makeLink($text, $query = null, $type=null) {
319 if ( $query === null ) {
324 if( in_array( $type, array( 'first', 'prev', 'next', 'last' ) ) ) {
325 # HTML5 rel attributes
326 $attrs['rel'] = $type;
330 $attrs['class'] = "mw-{$type}link";
332 return $this->getSkin()->link(
336 $query +
$this->getDefaultQuery(),
337 array( 'noclasses', 'known' )
342 * Hook into getBody(), allows text to be inserted at the start. This
343 * will be called even if there are no rows in the result set.
345 function getStartBody() {
350 * Hook into getBody() for the end of the list
352 function getEndBody() {
357 * Hook into getBody(), for the bit between the start and the
358 * end when there are no rows
360 function getEmptyBody() {
365 * Title used for self-links. Override this if you want to be able to
366 * use a title other than $wgTitle
368 function getTitle() {
369 return $GLOBALS['wgTitle'];
373 * Get the current skin. This can be overridden if necessary.
376 if ( !isset( $this->mSkin
) ) {
378 $this->mSkin
= $wgUser->getSkin();
384 * Get an array of query parameters that should be put into self-links.
385 * By default, all parameters passed in the URL are used, except for a
388 function getDefaultQuery() {
389 if ( !isset( $this->mDefaultQuery
) ) {
390 $this->mDefaultQuery
= $_GET;
391 unset( $this->mDefaultQuery
['title'] );
392 unset( $this->mDefaultQuery
['dir'] );
393 unset( $this->mDefaultQuery
['offset'] );
394 unset( $this->mDefaultQuery
['limit'] );
395 unset( $this->mDefaultQuery
['order'] );
396 unset( $this->mDefaultQuery
['month'] );
397 unset( $this->mDefaultQuery
['year'] );
399 return $this->mDefaultQuery
;
403 * Get the number of rows in the result set
405 function getNumRows() {
406 if ( !$this->mQueryDone
) {
409 return $this->mResult
->numRows();
413 * Get a URL query array for the prev, next, first and last links.
415 function getPagingQueries() {
416 if ( !$this->mQueryDone
) {
420 # Don't announce the limit everywhere if it's the default
421 $urlLimit = $this->mLimit
== $this->mDefaultLimit ?
'' : $this->mLimit
;
423 if ( $this->mIsFirst
) {
429 'offset' => $this->mFirstShown
,
432 $first = array( 'limit' => $urlLimit );
434 if ( $this->mIsLast
) {
438 $next = array( 'offset' => $this->mLastShown
, 'limit' => $urlLimit );
439 $last = array( 'dir' => 'prev', 'limit' => $urlLimit );
449 function isNavigationBarShown() {
450 if ( !$this->mQueryDone
) {
453 // Hide navigation by default if there is nothing to page
454 return !($this->mIsFirst
&& $this->mIsLast
);
458 * Get paging links. If a link is disabled, the item from $disabledTexts
459 * will be used. If there is no such item, the unlinked text from
460 * $linkTexts will be used. Both $linkTexts and $disabledTexts are arrays
463 function getPagingLinks( $linkTexts, $disabledTexts = array() ) {
464 $queries = $this->getPagingQueries();
466 foreach ( $queries as $type => $query ) {
467 if ( $query !== false ) {
468 $links[$type] = $this->makeLink(
473 } elseif ( isset( $disabledTexts[$type] ) ) {
474 $links[$type] = $disabledTexts[$type];
476 $links[$type] = $linkTexts[$type];
482 function getLimitLinks() {
485 if ( $this->mIsBackwards
) {
486 $offset = $this->mPastTheEndIndex
;
488 $offset = $this->mOffset
;
490 foreach ( $this->mLimitsShown
as $limit ) {
491 $links[] = $this->makeLink(
492 $wgLang->formatNum( $limit ),
493 array( 'offset' => $offset, 'limit' => $limit ),
501 * Abstract formatting function. This should return an HTML string
502 * representing the result row $row. Rows will be concatenated and
503 * returned by getBody()
505 abstract function formatRow( $row );
508 * This function should be overridden to provide all parameters
509 * needed for the main paged query. It returns an associative
510 * array with the following elements:
511 * tables => Table(s) for passing to Database::select()
512 * fields => Field(s) for passing to Database::select(), may be *
513 * conds => WHERE conditions
514 * options => option array
515 * join_conds => JOIN conditions
517 abstract function getQueryInfo();
520 * This function should be overridden to return the name of the index fi-
521 * eld. If the pager supports multiple orders, it may return an array of
522 * 'querykey' => 'indexfield' pairs, so that a request with &count=querykey
523 * will use indexfield to sort. In this case, the first returned key is
526 * Needless to say, it's really not a good idea to use a non-unique index
527 * for this! That won't page right.
529 abstract function getIndexField();
532 * Return the default sorting direction: false for ascending, true for de-
533 * scending. You can also have an associative array of ordertype => dir,
534 * if multiple order types are supported. In this case getIndexField()
535 * must return an array, and the keys of that must exactly match the keys
538 * For backward compatibility, this method's return value will be ignored
539 * if $this->mDefaultDirection is already set when the constructor is
540 * called, for instance if it's statically initialized. In that case the
541 * value of that variable (which must be a boolean) will be used.
543 * Note that despite its name, this does not return the value of the
544 * $this->mDefaultDirection member variable. That's the default for this
545 * particular instantiation, which is a single value. This is the set of
546 * all defaults for the class.
548 protected function getDefaultDirections() { return false; }
553 * IndexPager with an alphabetic list and a formatted navigation bar
556 abstract class AlphabeticPager
extends IndexPager
{
558 * Shamelessly stolen bits from ReverseChronologicalPager,
559 * didn't want to do class magic as may be still revamped
561 function getNavigationBar() {
564 if ( !$this->isNavigationBarShown() ) return '';
566 if( isset( $this->mNavigationBar
) ) {
567 return $this->mNavigationBar
;
570 $opts = array( 'parsemag', 'escapenoentities' );
575 $wgLang->formatNum( $this->mLimit
)
580 $wgLang->formatNum($this->mLimit
)
582 'first' => wfMsgExt( 'page_first', $opts ),
583 'last' => wfMsgExt( 'page_last', $opts )
586 $pagingLinks = $this->getPagingLinks( $linkTexts );
587 $limitLinks = $this->getLimitLinks();
588 $limits = $wgLang->pipeList( $limitLinks );
590 $this->mNavigationBar
=
591 "(" . $wgLang->pipeList(
592 array( $pagingLinks['first'],
593 $pagingLinks['last'] )
595 wfMsgHtml( 'viewprevnext', $pagingLinks['prev'],
596 $pagingLinks['next'], $limits );
598 if( !is_array( $this->getIndexField() ) ) {
599 # Early return to avoid undue nesting
600 return $this->mNavigationBar
;
605 $msgs = $this->getOrderTypeMessages();
606 foreach( array_keys( $msgs ) as $order ) {
610 $extra .= wfMsgExt( 'pipe-separator' , 'escapenoentities' );
613 if( $order == $this->mOrderType
) {
614 $extra .= wfMsgHTML( $msgs[$order] );
616 $extra .= $this->makeLink(
617 wfMsgHTML( $msgs[$order] ),
618 array( 'order' => $order )
623 if( $extra !== '' ) {
624 $this->mNavigationBar
.= " ($extra)";
627 return $this->mNavigationBar
;
631 * If this supports multiple order type messages, give the message key for
632 * enabling each one in getNavigationBar. The return type is an associa-
633 * tive array whose keys must exactly match the keys of the array returned
634 * by getIndexField(), and whose values are message keys.
637 protected function getOrderTypeMessages() {
643 * IndexPager with a formatted navigation bar
646 abstract class ReverseChronologicalPager
extends IndexPager
{
647 public $mDefaultDirection = true;
651 function __construct() {
652 parent
::__construct();
655 function getNavigationBar() {
658 if ( !$this->isNavigationBarShown() ) return '';
660 if ( isset( $this->mNavigationBar
) ) {
661 return $this->mNavigationBar
;
663 $nicenumber = $wgLang->formatNum( $this->mLimit
);
667 array( 'parsemag', 'escape' ),
672 array( 'parsemag', 'escape' ),
675 'first' => wfMsgHtml( 'histlast' ),
676 'last' => wfMsgHtml( 'histfirst' )
679 $pagingLinks = $this->getPagingLinks( $linkTexts );
680 $limitLinks = $this->getLimitLinks();
681 $limits = $wgLang->pipeList( $limitLinks );
683 $this->mNavigationBar
= "({$pagingLinks['first']}" .
684 wfMsgExt( 'pipe-separator' , 'escapenoentities' ) .
685 "{$pagingLinks['last']}) " .
688 $pagingLinks['prev'], $pagingLinks['next'],
691 return $this->mNavigationBar
;
694 function getDateCond( $year, $month ) {
695 $year = intval($year);
696 $month = intval($month);
697 // Basic validity checks
698 $this->mYear
= $year > 0 ?
$year : false;
699 $this->mMonth
= ($month > 0 && $month < 13) ?
$month : false;
700 // Given an optional year and month, we need to generate a timestamp
701 // to use as "WHERE rev_timestamp <= result"
702 // Examples: year = 2006 equals < 20070101 (+000000)
703 // year=2005, month=1 equals < 20050201
704 // year=2005, month=12 equals < 20060101
705 if ( !$this->mYear
&& !$this->mMonth
) {
708 if ( $this->mYear
) {
709 $year = $this->mYear
;
711 // If no year given, assume the current one
712 $year = gmdate( 'Y' );
713 // If this month hasn't happened yet this year, go back to last year's month
714 if( $this->mMonth
> gmdate( 'n' ) ) {
718 if ( $this->mMonth
) {
719 $month = $this->mMonth +
1;
720 // For December, we want January 1 of the next year
726 // No month implies we want up to the end of the year in question
731 if ( $year > 2032 ) {
734 $ymd = (int)sprintf( "%04d%02d01", $year, $month );
735 if ( $ymd > 20320101 ) {
738 $this->mOffset
= $this->mDb
->timestamp( "${ymd}000000" );
743 * Table-based display with a user-selectable sort order
746 abstract class TablePager
extends IndexPager
{
750 function __construct() {
752 $this->mSort
= $wgRequest->getText( 'sort' );
753 if ( !array_key_exists( $this->mSort
, $this->getFieldNames() ) ) {
754 $this->mSort
= $this->getDefaultSort();
756 if ( $wgRequest->getBool( 'asc' ) ) {
757 $this->mDefaultDirection
= false;
758 } elseif ( $wgRequest->getBool( 'desc' ) ) {
759 $this->mDefaultDirection
= true;
760 } /* Else leave it at whatever the class default is */
762 parent
::__construct();
765 function getStartBody() {
767 $tableClass = htmlspecialchars( $this->getTableClass() );
768 $sortClass = htmlspecialchars( $this->getSortHeaderClass() );
770 $s = "<table border='1' class=\"$tableClass\"><thead><tr>\n";
771 $fields = $this->getFieldNames();
774 foreach ( $fields as $field => $name ) {
775 if ( strval( $name ) == '' ) {
776 $s .= "<th> </th>\n";
777 } elseif ( $this->isFieldSortable( $field ) ) {
778 $query = array( 'sort' => $field, 'limit' => $this->mLimit
);
779 if ( $field == $this->mSort
) {
780 # This is the sorted column
781 # Prepare a link that goes in the other sort order
782 if ( $this->mDefaultDirection
) {
784 $image = 'Arr_u.png';
787 $alt = htmlspecialchars( wfMsg( 'descending_abbrev' ) );
790 $image = 'Arr_d.png';
792 $query['desc'] = '1';
793 $alt = htmlspecialchars( wfMsg( 'ascending_abbrev' ) );
795 $image = htmlspecialchars( "$wgStylePath/common/images/$image" );
796 $link = $this->makeLink(
797 "<img width=\"12\" height=\"12\" alt=\"$alt\" src=\"$image\" />" .
798 htmlspecialchars( $name ), $query );
799 $s .= "<th class=\"$sortClass\">$link</th>\n";
801 $s .= '<th>' . $this->makeLink( htmlspecialchars( $name ), $query ) . "</th>\n";
804 $s .= '<th>' . htmlspecialchars( $name ) . "</th>\n";
807 $s .= "</tr></thead><tbody>\n";
811 function getEndBody() {
812 return "</tbody></table>\n";
815 function getEmptyBody() {
816 $colspan = count( $this->getFieldNames() );
817 $msgEmpty = wfMsgHtml( 'table_pager_empty' );
818 return "<tr><td colspan=\"$colspan\">$msgEmpty</td></tr>\n";
821 function formatRow( $row ) {
822 $this->mCurrentRow
= $row; # In case formatValue etc need to know
823 $s = Xml
::openElement( 'tr', $this->getRowAttrs($row) );
824 $fieldNames = $this->getFieldNames();
825 foreach ( $fieldNames as $field => $name ) {
826 $value = isset( $row->$field ) ?
$row->$field : null;
827 $formatted = strval( $this->formatValue( $field, $value ) );
828 if ( $formatted == '' ) {
829 $formatted = ' ';
831 $s .= Xml
::tags( 'td', $this->getCellAttrs( $field, $value ), $formatted );
838 * Get a class name to be applied to the given row.
839 * @param object $row The database result row
841 function getRowClass( $row ) {
846 * Get attributes to be applied to the given row.
847 * @param object $row The database result row
848 * @return associative array
850 function getRowAttrs( $row ) {
851 return array( 'class' => $this->getRowClass( $row ) );
855 * Get any extra attributes to be applied to the given cell. Don't
856 * take this as an excuse to hardcode styles; use classes and
857 * CSS instead. Row context is available in $this->mCurrentRow
858 * @param $field The column
859 * @param $value The cell contents
860 * @return associative array
862 function getCellAttrs( $field, $value ) {
863 return array( 'class' => 'TablePager_col_' . $field );
866 function getIndexField() {
870 function getTableClass() {
874 function getNavClass() {
875 return 'TablePager_nav';
878 function getSortHeaderClass() {
879 return 'TablePager_sort';
883 * A navigation bar with images
885 function getNavigationBar() {
886 global $wgStylePath, $wgContLang;
888 if ( !$this->isNavigationBarShown() ) return '';
890 $path = "$wgStylePath/common/images";
892 'first' => 'table_pager_first',
893 'prev' => 'table_pager_prev',
894 'next' => 'table_pager_next',
895 'last' => 'table_pager_last',
898 'first' => 'arrow_first_25.png',
899 'prev' => 'arrow_left_25.png',
900 'next' => 'arrow_right_25.png',
901 'last' => 'arrow_last_25.png',
903 $disabledImages = array(
904 'first' => 'arrow_disabled_first_25.png',
905 'prev' => 'arrow_disabled_left_25.png',
906 'next' => 'arrow_disabled_right_25.png',
907 'last' => 'arrow_disabled_last_25.png',
909 if( $wgContLang->isRTL() ) {
910 $keys = array_keys( $labels );
911 $images = array_combine( $keys, array_reverse( $images ) );
912 $disabledImages = array_combine( $keys, array_reverse( $disabledImages ) );
915 $linkTexts = array();
916 $disabledTexts = array();
917 foreach ( $labels as $type => $label ) {
918 $msgLabel = wfMsgHtml( $label );
919 $linkTexts[$type] = "<img src=\"$path/{$images[$type]}\" alt=\"$msgLabel\"/><br />$msgLabel";
920 $disabledTexts[$type] = "<img src=\"$path/{$disabledImages[$type]}\" alt=\"$msgLabel\"/><br />$msgLabel";
922 $links = $this->getPagingLinks( $linkTexts, $disabledTexts );
924 $navClass = htmlspecialchars( $this->getNavClass() );
925 $s = "<table class=\"$navClass\" align=\"center\" cellpadding=\"3\"><tr>\n";
926 $cellAttrs = 'valign="top" align="center" width="' . 100 / count( $links ) . '%"';
927 foreach ( $labels as $type => $label ) {
928 $s .= "<td $cellAttrs>{$links[$type]}</td>\n";
930 $s .= "</tr></table>\n";
935 * Get a <select> element which has options for each of the allowed limits
937 function getLimitSelect() {
939 $s = "<select name=\"limit\">";
940 foreach ( $this->mLimitsShown
as $key => $value ) {
941 # The pair is either $index => $limit, in which case the $value
942 # will be numeric, or $limit => $text, in which case the $value
944 if( is_int( $value ) ){
946 $text = $wgLang->formatNum( $limit );
951 $selected = ( $limit == $this->mLimit ?
'selected="selected"' : '' );
952 $s .= "<option value=\"$limit\" $selected>$text</option>\n";
959 * Get <input type="hidden"> elements for use in a method="get" form.
960 * Resubmits all defined elements of the $_GET array, except for a
961 * blacklist, passed in the $blacklist parameter.
963 function getHiddenFields( $blacklist = array() ) {
964 $blacklist = (array)$blacklist;
966 foreach ( $blacklist as $name ) {
967 unset( $query[$name] );
970 foreach ( $query as $name => $value ) {
971 $encName = htmlspecialchars( $name );
972 $encValue = htmlspecialchars( $value );
973 $s .= "<input type=\"hidden\" name=\"$encName\" value=\"$encValue\"/>\n";
979 * Get a form containing a limit selection dropdown
981 function getLimitForm() {
984 # Make the select with some explanatory text
985 $msgSubmit = wfMsgHtml( 'table_pager_limit_submit' );
991 'action' => $wgScript
994 wfMsgHtml( 'table_pager_limit', $this->getLimitSelect() ) .
995 "\n<input type=\"submit\" value=\"$msgSubmit\"/>\n" .
996 $this->getHiddenFields( array( 'limit' ) ) .
1001 * Return true if the named field should be sortable by the UI, false
1004 * @param string $field
1006 abstract function isFieldSortable( $field );
1009 * Format a table cell. The return value should be HTML, but use an empty
1010 * string not for empty cells. Do not include the <td> and </td>.
1012 * The current result row is available as $this->mCurrentRow, in case you
1013 * need more context.
1015 * @param string $name The database field name
1016 * @param string $value The value retrieved from the database
1018 abstract function formatValue( $name, $value );
1021 * The database field name used as a default sort order
1023 abstract function getDefaultSort();
1026 * An array mapping database field names to a textual description of the
1027 * field name, for use in the table header. The description should be plain
1028 * text, it will be HTML-escaped later.
1030 abstract function getFieldNames();