/application/libraries/tree/paginator/st_paginator.php

<?php  

	if ( ! defined('BASEPATH')) exit('No direct script access allowed');

	/**

	 * CodeIgniter

	 * @package		CodeIgniter

	 * @subpackage	Libraries

	 * @author		AnhDT

	 */



	class st_paginator implements Countable, IteratorAggregate {

		// Ki?u tr??t trang

		protected static $_defaultScrolling = 'slider';

		// Ti?n t? c?a l?p tr??t trang

		protected static $_prefixScrolling = 'st_paginator_scrolling_';

		// Ti?n t? c?a l?p engine

		protected static $_prefixEngine    = 'st_paginator_engine_';

		// L?p phân trang

		protected $_engine = null;

		// L?p tr??t trang

		protected $_scrolling = null;	

		// S? l??ng các ph?n t? trong trang hi?n t?i

		protected $_currentItemCount = null;

		// Các ph?n t? trong trang hi?n t?i

		protected $_currentItems = null;

		// Ch? m?c trang hi?n t?i

		protected $_currentPageIndex = 1;

		// S? l??ng các ph?n t? có trong m?i trang

		protected $_itemCountPerPage = 4;

		// S? l??ng các trang

		protected $_pageCount = null;

		// Kho?ng cách tr??t

		protected $_pageRange = 5;

		// Các trang

		protected $_pages = null;

		

		public function __construct(st_paginator_engine_interface $_engine = null) {

			if (null !== $_engine) {

				$this->_engine = $_engine;

			}

		}

		

		/**Thi?t l?p ti?n t? tr??t trang*/

		public function setPrefixScrolling($_prefix = '') {

			if (!empty($_prefix)) {

				self::$_prefixScrolling = $_prefix;

			}

			return $this;

		}

		

		/**L?y v? ti?n t? tr??t trang*/

		public function getPrefixScrolling() {

			return (string)self::$_prefixScrolling;	

		}

		

		/**Thi?t l?p ti?n t? engine*/

		public function setPrefixEngine($_prefix = '') {

			if (!empty($_prefix)) {

				self::$_prefixEngine = $_prefix;	

			}	

			return $this;

		}

		

		/**L?y v? ti?n t? engine*/

		public function getPrefixEngine() {

			return (string)self::$_prefixEngine;	

		}

		

		/**L?y v? ki?u tr??t ch? m?c m?c ??nh*/

		public static function getDefaultScrolling() {

			return self::$_defaultScrolling;

		}

		/**Thi?t l?p ki?u tr??t ch? m?c m?c ??nh*/

		public static function setDefaultScrolling($_scrollingType = 'slider') {

			self::$_defaultScrolling = $_scrollingType;

		}

		

		/**

		 * Tr? v? s? l??ng các trang

		 * @return integer

		 */

		public function count() {

			if (!$this->_pageCount) {

				$this->_pageCount = $this->_calculatePageCount();

			}

			return $this->_pageCount;

		}

	

		/**

		 * Tr? v? s? l??ng các ph?n t? có s?n

		 * @return integer

		 */

		public function getTotalItemCount() {

			return count($this->_scrolling);

		}



		/**

		 * Tr? v? ki?u phân trang: collection, array...

		 * @return st_paginator_engine_interface

		 */

		public function getEngine() {

			return $this->_engine;

		}

		

		/**

		 * Thi?t l?p ki?u phân trang: collection, array...

		 * @return st_paginator

		 */

		public function setEngine(st_paginator_engine_interface $_engine) {

			$this->_engine = $_engine;

			return $this;

		}

	

		/**

		 * Tr? v? s? l??ng các ph?n t? có trong trang hi?n t?i

		 * @return integer

		 */

		public function getCurrentItemCount() {

			if ($this->_currentItemCount === null) {

				$this->_currentItemCount = $this->getItemCount($this->getCurrentItems());

			}

			return $this->_currentItemCount;

		}

	

		/**

		 * L?y v? các ph?n t? trong trang hi?n t?i

		 * @return Traversable

		 */

		public function getCurrentItems() {

			if ($this->_currentItems === null) {

				$this->_currentItems = $this->getItemsByPage($this->getCurrentPageNumber());

			}

			return $this->_currentItems;

		}

	

		/**

		 * L?y v? ch? m?c trang hi?n th?i

		 * @return integer

		 */

		public function getCurrentPageNumber() {

			return $this->renderPageNumber($this->_currentPageIndex);

		}

	

		/**

		 * Thi?t l?p trang hi?n th?i

		 * @param  integer $_pageNumber Page number

		 * @return Zend_Paginator $this

		 */

		public function setCurrentPageNumber($_pageNumber) {

			$this->_currentPageIndex = (integer) $_pageNumber;

			$this->_currentItems      = null;

			$this->_currentItemCount  = null;

			return $this;

		}

	

		/**

		 * Tr? v? s? l??ng các ph?n t? có trong m?i trang

		 * @return integer

		 */

		public function getItemCountPerPage() {

			return $this->_itemCountPerPage;

		}

	

		/**

		 * Thi?t l?p s? ph?n t? có trong m?i trang

		 * @param  integer $_itemCountPerPage

		 * @return Zend_Paginator $this

		 */

		public function setItemCountPerPage($_itemCountPerPage) {

			$this->_itemCountPerPage = (integer) $_itemCountPerPage;

			if ($this->_itemCountPerPage == 0) {

				$this->_itemCountPerPage = 1;

			}

			$this->_pageCount  = $this->_calculatePageCount();

			$this->_currentItems     = null;

			$this->_currentItemCount = null;

			return $this;

		}

	

		/**

		 * Tr? v? s? ph?n t? có trong t?p h?p

		 * @param  mixed $items Items

		 * @return integer

		 */

		public function getItemCount($items) {

			$itemCount = 0;       

			if (is_array($items) or $items instanceof Countable) {

				$itemCount = count($items);

			}

			return $itemCount;

		}

		

		/**

		 * Tr? v? ph?n t? trong m?t trang, s? l?y trang hi?n th?i n?u ch?

		 * m?c c?a trang không ???c ch? ra

		 * @param  integer $_itemNumber Item number (1 to itemCountPerPage)

		 * @param  integer $_pageNumber

		 * @return mixed

		 */

		public function getItem($_itemNumber, $_pageNumber = null) {

			$_itemNumber = $this->renderItemNumber($_itemNumber);       

			if ($_pageNumber == null) {

				$_pageNumber = $this->getCurrentPageNumber();

			}

			$page      = $this->getItemsByPage($_pageNumber);

			$itemCount = $this->getItemCount($page);

			if ($itemCount == 0 || $_itemNumber > $itemCount) {

				return false;

			}

			return $page[$_itemNumber - 1];

		}

	

		/**

		 * Returns the items for a given page.

		 *

		 * @return Traversable

		 */

		public function getItemsByPage($_pageNumber) {

			$_pageNumber = $this->renderPageNumber($_pageNumber);

			$offset = ($_pageNumber - 1) * $this->_itemCountPerPage;	

			$items = $this->_engine->getItems($offset, $this->_itemCountPerPage);

			return $items;

		}

	

		/**

		 * L?y v? b? duy?t cho các ph?n t? có trong trang hi?n t?i

		 * @return Traversable

		 */

		public function getIterator() {

			return $this->getCurrentItems();

		}

	

		/**

		 * L?y v? kho?ng cách tr??t trang

		 * @return integer

		 */

		public function getPageRange() {

			return $this->_pageRange;

		}

	

		/**

		 * Thi?t l?p kho?ng cách tr??t trang

		 * @param  integer $_pageRange

		 * @return Zend_Paginator $this

		 */

		public function setPageRange($_pageRange) {

			$this->_pageRange = (integer)$_pageRange;

			return $this;

		}

	

		/**

		 * Tr? v? t?p h?p các trang

		 * @param  string $_scrollingType Scrolling style

		 * @return array

		 */

		public function getPages($_scrollingType) {

			if ($this->_pages === null) {

				$this->_pages = $this->_createPages($_scrollingType);

			}

			return $this->_pages;

		}

	

		/**

		 * L?y v? các trang trong m?t kho?ng

		 * @param  integer $lowerBound Lower bound of the range

		 * @param  integer $upperBound Upper bound of the range

		 * @return array

		 */

		public function getPagesInRange($lowerBound, $upperBound) {

			$lowerBound = $this->renderPageNumber($lowerBound);

			$upperBound = $this->renderPageNumber($upperBound);

			$pages = array();			

			for ($_pageNumber = $lowerBound; $_pageNumber <= $upperBound; $_pageNumber++) {

				$pages[$_pageNumber] = $_pageNumber;

			}

			return $pages;

		}

	

		/**

		 * Chu?n hóa l?i giá tr? s? trong ?? dŕi c?a trang.

		 * @param  integer $_itemNumber

		 * @return integer

		 */

		protected function renderItemNumber($_itemNumber) {

			$_itemNumber = ($_itemNumber < 1) ? 1 : $_itemNumber; 

			$_itemNumber = ($_itemNumber > $this->_itemCountPerPage) ? $_itemNumber = $this->_itemCountPerPage : $_itemNumber;

			return $_itemNumber;

		}

	

		/**Chu?n hóa l?i giá tr? ch? m?c c?a trang

		 * @param  integer $_pageNumber

		 * @return integer

		 */

		protected function renderPageNumber($_pageNumber) {

			$_pageNumber = ($_pageNumber < 1) ? 1 : $_pageNumber;

			$_pageCount = $this->count();       

			if ($_pageCount > 0 and $_pageNumber > $_pageCount) {

				$_pageNumber = $_pageCount;

			}

			return $_pageNumber;

		}

	

		/**

		 * Tính toán s? t?ng s? trang

		 * @return integer

		 */

		protected function _calculatePageCount() {

			return (integer) ceil($this->_engine->count() / $this->_itemCountPerPage);

		}

	

		/**

		 * T?o ra t?p h?p các trang

		 * @param  string $_scrollingType Scrolling style

		 * @return stdClass

		 */

		protected function _createPages($_scrollingType = null) {

			$_pageCount         = $this->count();

			$_currentPageNumber = $this->getCurrentPageNumber();

			

			$pages = new stdClass();

			$pages->pageCount        = $_pageCount;

			$pages->itemCountPerPage = $this->getItemCountPerPage();

			$pages->first            = 1;

			$pages->current          = $_currentPageNumber;

			$pages->last             = $_pageCount;

	

			// Previous and next

			if ($_currentPageNumber - 1 > 0) {

				$pages->previous = $_currentPageNumber - 1;

			}

	

			if ($_currentPageNumber + 1 <= $_pageCount) {

				$pages->next = $_currentPageNumber + 1;

			}

	

			// Pages in range

			$_scrollingType = $this->_loadScrolling($_scrollingType);

			$pages->pagesInRange     = $_scrollingType->getPages($this);

			$pages->firstPageInRange = min($pages->pagesInRange);

			$pages->lastPageInRange  = max($pages->pagesInRange);

	

			// Item numbers

			if ($this->getCurrentItems() !== null) {

				$pages->currentItemCount = $this->getCurrentItemCount();

				$pages->itemCountPerPage = $this->getItemCountPerPage();

				$pages->totalItemCount   = $this->getTotalItemCount();

				$pages->firstItemNumber  = (($_currentPageNumber - 1) * $this->_itemCountPerPage) + 1;

				$pages->lastItemNumber   = $pages->firstItemNumber + $pages->currentItemCount - 1;

			}

	

			return $pages;

		}

	

		/**

		 * N?p m?t ki?u phân trang

		 * @param string $_scrollingType

		 * @return Zend_Paginator_Scrolling_Interface

		 */

		protected function _loadScrolling($_scrollingType = null) {

			if ($_scrollingType === null) {

				$_scrollingType = self::$_prefixScrolling . self::$_defaultScrolling;

			}

			switch (strtolower(gettype($_scrollingType))) {

				case 'object':

					if (!$_scrollingType instanceof st_paginator_scrolling_interface) {

						return false;

					}

					if (null === $this->_scrolling) {

						$this->_scrolling = $_scrollingType;

					}

					return $this->_scrolling;

				case 'string':

					$_className = strtolower(self::$_prefixScrolling .$_scrollingType);

					if (!class_exists($_className)) {

						require_once APP_LIBRARY_PATH . 'tree/paginator/scrolling/' . $_className . '.php';	

					}

					if (null === $this->_scrolling) {

						$this->_scrolling = new $_className();

					}

					return $this->_scrolling;

				case 'null':

				default:

					return false;

			}

		}

		

		/**

		 * S? d?ng c?u hěnh trong m?t l?n goi  ph??ng th?c

		 * @param class $_engine

		 * @param integer $_itemPerPage

		 * @param integer $_pageRange

		 * @param integer $_currentPageNumber

		 * @param string $_scrollingType

		 * @return Zend_Paginator_Scrolling_Interface

		 */

		public function setConfig($_config = array()) {

			if (!is_array($_config) || count($_config) == null) {

				throw new Exception("config must be array and not empty");

			}

			foreach ($_config as $_key => $_object) {

				$_method = 'set' . ucfirst($_key);

				$this->$_method($_object);

			}

			return $this;			

		}

	}

?>