晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/thread-self/root/home/akaindir/public_html/crm/modules/Vtiger/models/Paging.php
<?php
/*+***********************************************************************************
 * The contents of this file are subject to the vtiger CRM Public License Version 1.0
 * ("License"); You may not use this file except in compliance with the License
 * The Original Code is:  vtiger CRM Open Source
 * The Initial Developer of the Original Code is vtiger.
 * Portions created by vtiger are Copyright (C) vtiger.
 * All Rights Reserved.
 *************************************************************************************/

/**
 * Vtiger Paging Model Class
 */
class Vtiger_Paging_Model extends Vtiger_Base_Model {

	const DEFAULT_PAGE = 1;
	const PAGE_LIMIT = 20;

	/**
	 * Function to get the current page number
	 * @return <Number>
	 */
	function getCurrentPage() {
		$currentPage = $this->get('page');
		if(empty($currentPage)) {
			$currentPage = self::DEFAULT_PAGE;
		}
		return $currentPage;
	}

	/**
	 * Function to get the Next page number
	 * @return <Number>
	 */
	function getNextPage() {
		$currentPage = $this->get('page');
		if(empty($currentPage)) {
			$currentPage = self::DEFAULT_PAGE;
		}
		return $currentPage+1;
	}

	/**
	 * Function to get the limit on the number of records per page
	 * @return <Number>
	 */
	function getPageLimit() {
		$pageLimit = $this->get('limit');
		if(empty($pageLimit)) {
			$pageLimit = vglobal('list_max_entries_per_page');
			if(empty($pageLimit)) {
				$pageLimit = self::PAGE_LIMIT;
			}
		}
		return $pageLimit;
	}

	function getStartIndex() {
		$currentPage = $this->getCurrentPage();
		$pageLimit = $this->getPageLimit();
		return ($currentPage-1)*$pageLimit;
	}

	/**
	 * Retrieves start sequence number of records in the page
	 * @return <Integer>
	 */
	function getRecordStartRange() {
		$rangeInfo = $this->getRecordRange();
		return $rangeInfo['start'];
	}

	/**
	 * Retrieves end sequence number of records in the page
	 * @return <Integer>
	 */
	function getRecordEndRange() {
		$rangeInfo = $this->getRecordRange();
		return $rangeInfo['end'];
	}

	/**
	 * Retrieves start and end sequence number of records in the page
	 * @return <array> - array of values
	 *						- start key which gives start sequence number
	 *						- end key which gives end sequence number
	 */
	function getRecordRange() {
		return $this->get('range');
	}

	/**
	 * Function to specify if previous page exists
	 * @return <Boolean> - true/false
	 */
	public function isPrevPageExists() {
		$prevPageExists = $this->get('prevPageExists');
		if(isset($prevPageExists)) {
			return $prevPageExists;
		}
		return true;
	}

	/**
	 * Function to specify if next page exists
	 * @return <Boolean> - true/false
	 */
	public function isNextPageExists() {
		$nextPageExists = $this->get('nextPageExists');
		if(isset($nextPageExists)) {
			return $nextPageExists;
		}
		return true;
	}

	/**
	 * calculates page range
	 * @param <type> $recordList - list of records which is show in current page
	 * @return Vtiger_Paging_Model  -
	 */
	function calculatePageRange($recordList) {
		$rangeInfo = array();
		$recordCount = count($recordList);
		$pageLimit = $this->getPageLimit();
		$prevPageExists = $nextPageExists = false;

		if ($recordCount > 0) {
			//specifies what sequencce number of last record in prev page
			$prevPageLastRecordSequence = (($this->getCurrentPage()-1)*$pageLimit);

			$rangeInfo['start'] = $prevPageLastRecordSequence+1;
			if ($rangeInfo['start'] != 1) {
				$prevPageExists = true;
			}

			$rangeInfo['end'] = $prevPageLastRecordSequence + $recordCount;
			if ($recordCount > $pageLimit) {
				$nextPageExists = true;
				$rangeInfo['end'] = $prevPageLastRecordSequence + $pageLimit;
			}

			$this->set('range', $rangeInfo);
		} else {
			//Disable previous page only if page is first page and no records exists
			if ($this->getCurrentPage() != 1) {
				$prevPageExists = true;
			}
		}

		$this->set('prevPageExists', $prevPageExists);
		$this->set('nextPageExists', $nextPageExists);
		return $this;
	}

}

haha - 2025