CRM/Utils/Pager.php

   1 <?php
   2 /*
   3  +--------------------------------------------------------------------+
   4  | CiviCRM version 4.4                                                |
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   6  | Copyright CiviCRM LLC (c) 2004-2013                                |
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   8  | This file is a part of CiviCRM.                                    |
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  10  | CiviCRM is free software; you can copy, modify, and distribute it  |
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  12  | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
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  26 */
  27
  28 /**
  29  *
  30  * @package CRM
  31  * @copyright CiviCRM LLC (c) 2004-2013
  32  * $Id$
  33  *
  34  */
  35
  36 /**
  37  *
  38  * This class extends the PEAR pager object by substituting standard default pager arguments
  39  * We also extract the pageId from either the GET variables or the POST variable (since we
  40  * use a POST to jump to a specific page). At some point we should evaluate if we want
  41  * to use Pager_Jumping instead. We've changed the format to allow navigation by jumping
  42  * to a page and also First, Prev CURRENT Next Last
  43  *
  44  */
  45
  46 require_once 'Pager/Sliding.php';
  47 class CRM_Utils_Pager extends Pager_Sliding {
  48
  49   /**
  50    * constants for static parameters of the pager
  51    */
  52   CONST ROWCOUNT = 50, PAGE_ID = 'crmPID', PAGE_ID_TOP = 'crmPID', PAGE_ID_BOTTOM = 'crmPID_B', PAGE_ROWCOUNT = 'crmRowCount';
  53
  54   /**
  55    * the output of the pager. This is a name/value array with various keys
  56    * that an application could use to display the pager
  57    * @var array
  58    */
  59   public $_response;
  60
  61   /**
  62    * The pager constructor. Takes a few values, and then assigns a lot of defaults
  63    * to the PEAR pager class
  64    * We have embedded some html in this class. Need to figure out how to export this
  65    * to the top level at some point in time
  66    *
  67    * @param int     total        the total count of items to be displayed
  68    * @param int     currentPage  the page currently being displayed
  69    * @param string  status       the status message to be displayed. It embeds a token
  70    *                             %%statusMessage%% that will be replaced with which items
  71    *                             are currently being displayed
  72    * @param string  csvString    the title of the link to be displayed for the export
  73    * @param int     perPage      the number of items displayed per page
  74    *
  75    * @return object              the newly created and initialized pager object
  76    *
  77    * @access public
  78    *
  79    */
  80   function __construct($params) {
  81     if ($params['status'] === NULL) {
  82       $params['status'] = ts('Contacts %%StatusMessage%%');
  83     }
  84
  85     $this->initialize($params);
  86
  87     $this->Pager_Sliding($params);
  88
  89     list($offset, $limit) = $this->getOffsetAndRowCount();
  90     $start = $offset + 1;
  91     $end = $offset + $limit;
  92     if ($end > $params['total']) {
  93       $end = $params['total'];
  94     }
  95
  96     if ($params['total'] == 0) {
  97       $statusMessage = '';
  98     }
  99     else {
 100       $statusMessage = ts('%1 - %2 of %3', array(1 => $start, 2 => $end, 3 => $params['total']));
 101     }
 102     $params['status'] = str_replace('%%StatusMessage%%', $statusMessage, $params['status']);
 103
 104     $this->_response = array(
 105       'first' => $this->getFirstPageLink(),
 106       'back' => $this->getBackPageLink(),
 107       'next' => $this->getNextPageLink(),
 108       'last' => $this->getLastPageLink(),
 109       'currentPage' => $this->getCurrentPageID(),
 110       'numPages' => $this->numPages(),
 111       'csvString' => CRM_Utils_Array::value('csvString', $params),
 112       'status' => CRM_Utils_Array::value('status', $params),
 113       'buttonTop' => CRM_Utils_Array::value('buttonTop', $params),
 114       'buttonBottom' => CRM_Utils_Array::value('buttonBottom', $params),
 115       'twentyfive' => $this->getPerPageLink(25),
 116       'fifty' => $this->getPerPageLink(50),
 117       'onehundred' => $this->getPerPageLink(100),
 118     );
 119
 120     /**
 121      * A page cannot have two variables with the same form name. Hence in the
 122      * pager display, we have a form submission at the top with the normal
 123      * page variable, but a different form element for one at the bottom
 124      *
 125      */
 126     $this->_response['titleTop'] = ts('Page %1 of %2', array(1 => '<input size="2" maxlength="3" name="' . self::PAGE_ID . '" type="text" value="' . $this->_response['currentPage'] . '" />', 2 => $this->_response['numPages']));
 127     $this->_response['titleBottom'] = ts('Page %1 of %2', array(1 => '<input size="2" maxlength="3" name="' . self::PAGE_ID_BOTTOM . '" type="text" value="' . $this->_response['currentPage'] . '" />', 2 => $this->_response['numPages']));
 128   }
 129
 130   /**
 131    * helper function to assign remaining pager options as good default
 132    * values
 133    *
 134    * @param array   $params      the set of options needed to initialize the parent
 135    *                             constructor
 136    *
 137    * @access public
 138    *
 139    * @return void
 140    *
 141    */
 142   function initialize(&$params) {
 143     /* set the mode for the pager to Sliding */
 144
 145     $params['mode'] = 'Sliding';
 146
 147     /* also set the urlVar to be a crm specific get variable */
 148
 149     $params['urlVar'] = self::PAGE_ID;
 150
 151     /* set this to a small value, since we dont use this functionality */
 152
 153     $params['delta'] = 1;
 154
 155     $params['totalItems'] = $params['total'];
 156     $params['append'] = TRUE;
 157     $params['separator'] = '';
 158     $params['spacesBeforeSeparator'] = 1;
 159     $params['spacesAfterSeparator'] = 1;
 160     $params['extraVars'] = array('force' => 1);
 161     $params['excludeVars'] = array('reset', 'snippet', 'section');
 162
 163     // set previous and next text labels
 164     $params['prevImg'] = ' ' . ts('&lt; Previous');
 165     $params['nextImg'] = ts('Next &gt;') . ' ';
 166
 167
 168     // set first and last text fragments
 169     $params['firstPagePre'] = '';
 170     $params['firstPageText'] = ' ' . ts('&lt;&lt; First');
 171     $params['firstPagePost'] = '';
 172
 173     $params['lastPagePre'] = '';
 174     $params['lastPageText'] = ts('Last &gt;&gt;') . ' ';
 175     $params['lastPagePost'] = '';
 176
 177     if (isset($params['pageID'])) {
 178       $params['currentPage'] = $this->getPageID($params['pageID'], $params);
 179     }
 180
 181     $params['perPage'] = $this->getPageRowCount($params['rowCount']);
 182
 183     return $params;
 184   }
 185
 186   /**
 187    * Figure out the current page number based on value of
 188    * GET / POST variables. Hierarchy rules are followed,
 189    * POST over-rides a GET, a POST at the top overrides
 190    * a POST at the bottom (of the page)
 191    *
 192    * @param int defaultPageId   current pageId
 193    *
 194    * @return int                new pageId to display to the user
 195    * @access public
 196    *
 197    */
 198   function getPageID($defaultPageId = 1, &$params) {
 199     // POST has higher priority than GET vars
 200     // else if a value is set that has higher priority and finally the GET var
 201     $currentPage = $defaultPageId;
 202     if (!empty($_POST)) {
 203       if (isset($_POST[CRM_Utils_Array::value('buttonTop', $params)]) && isset($_POST[self::PAGE_ID])) {
 204         $currentPage = max((int )@$_POST[self::PAGE_ID], 1);
 205       }
 206       elseif (isset($_POST[$params['buttonBottom']]) && isset($_POST[self::PAGE_ID_BOTTOM])) {
 207         $currentPage = max((int )@$_POST[self::PAGE_ID_BOTTOM], 1);
 208       }
 209       elseif (isset($_POST[self::PAGE_ID])) {
 210         $currentPage = max((int )@$_POST[self::PAGE_ID], 1);
 211       }
 212       elseif (isset($_POST[self::PAGE_ID_BOTTOM])) {
 213         $currentPage = max((int )@$_POST[self::PAGE_ID_BOTTOM]);
 214       }
 215     }
 216     elseif (isset($_GET[self::PAGE_ID])) {
 217       $currentPage = max((int )@$_GET[self::PAGE_ID], 1);
 218     }
 219     return $currentPage;
 220   }
 221
 222   /**
 223    * Get the number of rows to display from either a GET / POST variable
 224    *
 225    * @param int $defaultPageRowCount the default value if not set
 226    *
 227    * @return int                     the rowCount value to use
 228    * @access public
 229    *
 230    */
 231   function getPageRowCount($defaultPageRowCount = self::ROWCOUNT) {
 232     // POST has higher priority than GET vars
 233     if (isset($_POST[self::PAGE_ROWCOUNT])) {
 234       $rowCount = max((int )@$_POST[self::PAGE_ROWCOUNT], 1);
 235     }
 236     elseif (isset($_GET[self::PAGE_ROWCOUNT])) {
 237       $rowCount = max((int )@$_GET[self::PAGE_ROWCOUNT], 1);
 238     }
 239     else {
 240       $rowCount = $defaultPageRowCount;
 241     }
 242     return $rowCount;
 243   }
 244
 245   /**
 246    * Use the pager class to get the pageId and Offset
 247    *
 248    * @param void
 249    *
 250    * @return array: an array of the pageID and offset
 251    *
 252    * @access public
 253    *
 254    */
 255   function getOffsetAndRowCount() {
 256     $pageId = $this->getCurrentPageID();
 257     if (!$pageId) {
 258       $pageId = 1;
 259     }
 260
 261     $offset = ($pageId - 1) * $this->_perPage;
 262
 263     return array($offset, $this->_perPage);
 264   }
 265
 266   /**
 267    * given a number create a link that will display the number of
 268    * rows as specified by that link
 269    *
 270    * @param int $perPage the number of rows
 271    *
 272    * @return string      the link
 273    * @access void
 274    */
 275   function getPerPageLink($perPage) {
 276     if ($perPage != $this->_perPage) {
 277       $href = $this->makeURL(self::PAGE_ROWCOUNT, $perPage);
 278       $link = sprintf('<a href="%s" %s>%s</a>',
 279         $href,
 280         $this->_classString,
 281         $perPage
 282       ) . $this->_spacesBefore . $this->_spacesAfter;
 283     }
 284     else {
 285       $link = $this->_spacesBefore . $perPage . $this->_spacesAfter;
 286     }
 287
 288     return $link;
 289   }
 290
 291   function getFirstPageLink() {
 292     if ($this->isFirstPage()) {
 293       return '';
 294     }
 295
 296     $href = $this->makeURL(self::PAGE_ID, 1);
 297     return sprintf('<a href="%s" title="%s">%s</a>',
 298       $href,
 299       str_replace('%d', 1, $this->_altFirst),
 300       $this->_firstPagePre . $this->_firstPageText . $this->_firstPagePost
 301     ) . $this->_spacesBefore . $this->_spacesAfter;
 302   }
 303
 304   function getLastPageLink() {
 305     if ($this->isLastPage()) {
 306       return '';
 307     }
 308
 309     $href = $this->makeURL(self::PAGE_ID, $this->_totalPages);
 310     return sprintf('<a href="%s" title="%s">%s</a>',
 311       $href,
 312       str_replace('%d', $this->_totalPages, $this->_altLast),
 313       $this->_lastPagePre . $this->_lastPageText . $this->_lastPagePost
 314     );
 315   }
 316
 317   function getBackPageLink() {
 318     if ($this->_currentPage > 1) {
 319       $href = $this->makeURL(self::PAGE_ID, $this->getPreviousPageID());
 320       return sprintf('<a href="%s" title="%s">%s</a>',
 321         $href,
 322         $this->_altPrev, $this->_prevImg
 323       ) . $this->_spacesBefore . $this->_spacesAfter;
 324     }
 325     return '';
 326   }
 327
 328   function getNextPageLink() {
 329     if ($this->_currentPage < $this->_totalPages) {
 330       $href = $this->makeURL(self::PAGE_ID, $this->getNextPageID());
 331       return $this->_spacesAfter . sprintf('<a href="%s" title="%s">%s</a>',
 332         $href,
 333         $this->_altNext, $this->_nextImg
 334       ) . $this->_spacesBefore . $this->_spacesAfter;
 335     }
 336     return '';
 337   }
 338
 339   /**
 340    * Build a url for pager links
 341    */
 342   function makeURL($key, $value) {
 343     $href = CRM_Utils_System::makeURL($key);
 344     // CRM-12212 Remove alpha sort param
 345     if (strpos($href, '&amp;sortByCharacter=')) {
 346       $href = preg_replace('#(.*)\&amp;sortByCharacter=[^&]*(.*)#', '\1\2', $href);
 347     }
 348     return $href . $value;
 349   }
 350 }
 351