library/Zend/Paginator/ScrollingStyle/Sliding.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Paginator
+ * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id$
+ */
+
+/**
+ * @see Zend_Paginator_ScrollingStyle_Interface
+ */
+require_once 'Zend/Paginator/ScrollingStyle/Interface.php';
+
+/**
+ * A Yahoo! Search-like scrolling style.  The cursor will advance to
+ * the middle of the range, then remain there until the user reaches
+ * the end of the page set, at which point it will continue on to
+ * the end of the range and the last page in the set.
+ *
+ * @link       http://search.yahoo.com/search?p=Zend+Framework
+ * @category   Zend
+ * @package    Zend_Paginator
+ * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Paginator_ScrollingStyle_Sliding implements Zend_Paginator_ScrollingStyle_Interface
+{
+    /**
+     * Returns an array of "local" pages given a page number and range.
+     *
+     * @param  Zend_Paginator $paginator
+     * @param  integer $pageRange (Optional) Page range
+     * @return array
+     */
+    public function getPages(Zend_Paginator $paginator, $pageRange = null)
+    {
+        if ($pageRange === null) {
+            $pageRange = $paginator->getPageRange();
+        }
+
+        $pageNumber = $paginator->getCurrentPageNumber();
+        $pageCount  = count($paginator);
+
+        if ($pageRange > $pageCount) {
+            $pageRange = $pageCount;
+        }
+
+        $delta = ceil($pageRange / 2);
+
+        if ($pageNumber - $delta > $pageCount - $pageRange) {
+            $lowerBound = $pageCount - $pageRange + 1;
+            $upperBound = $pageCount;
+        } else {
+            if ($pageNumber - $delta < 0) {
+                $delta = $pageNumber;
+            }
+
+            $offset     = $pageNumber - $delta;
+            $lowerBound = $offset + 1;
+            $upperBound = $offset + $pageRange;
+        }
+
+        return $paginator->getPagesInRange($lowerBound, $upperBound);
+    }
+}