paginator.php

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<?php
/* SVN FILE: $Id: paginator.php 7118 2008-06-04 20:49:29Z gwoo $ */
/**
 * Pagination Helper class file.
 *
 * Generates pagination links
 *
 * CakePHP(tm) :  Rapid Development Framework <http://www.cakephp.org/>
 * Copyright 2005-2008, Cake Software Foundation, Inc.
 *								1785 E. Sahara Avenue, Suite 490-204
 *								Las Vegas, Nevada 89104
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright		Copyright 2005-2008, Cake Software Foundation, Inc.
 * @link				http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package			cake
 * @subpackage		cake.cake.libs.view.helpers
 * @since			CakePHP(tm) v 1.2.0
 * @version			$Revision: 7118 $
 * @modifiedby		$LastChangedBy: gwoo $
 * @lastmodified	$Date: 2008-06-04 13:49:29 -0700 (Wed, 04 Jun 2008) $
 * @license			http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Pagination Helper class for easy generation of pagination links.
 *
 * PaginationHelper encloses all methods needed when working with pagination.
 *
 * @package		cake
 * @subpackage	cake.cake.libs.view.helpers
 */
class PaginatorHelper extends AppHelper {

/**
 * Helper dependencies
 *
 * @var array
 */
	var $helpers = array('Html', 'Ajax');
/**
 * Holds the default model for paged recordsets
 *
 * @var string
 */
	var $__defaultModel = null;
/**
 * Holds the default options for pagination links
 *
 * The values that may be specified are:
 * - <i>$options['sort']</i>  the key that the recordset is sorted.
 * - <i>$options['direction']</i> Direction of the sorting (default: 'asc').
 * - <i>$options['format']</i> Format of the counter. Supported formats are 'range' and 'pages'
 *                             and custom (default). In the default mode the supplied string is
 *                             parsed and constants are replaced by their actual values.
 *                             Constants: %page%, %pages%, %current%, %count%, %start%, %end% .
 * - <i>$options['separator']</i> The separator of the actual page and number of pages (default: ' of ').
 * - <i>$options['url']</i> Url of the action. See Router::url()
 * - <i>$options['model']</i> The name of the model.
 * - <i>$options['escape']</i> Defines if the title field for the link should be escaped (default: true).
 * - <i>$options['update']</i> DOM id of the element updated with the results of the AJAX call.
 *                             If this key isn't specified Paginator will use plain HTML links.
 * - <i>$options['indicator']</i> DOM id of the element that will be shown when doing AJAX requests.
 *
 * @var array
 */
	var $options = array();
/**
 * Gets the current page of the in the recordset for the given model
 *
 * @param  string $model Optional model name.  Uses the default if none is specified.
 * @return string The current page number of the paginated resultset.
 */
	function params($model = null) {
		if (empty($model)) {
			$model = $this->defaultModel();
		}
		if (!isset($this->params['paging']) || empty($this->params['paging'][$model])) {
			return null;
		}
		return $this->params['paging'][$model];
	}
/**
 * Sets default options for all pagination links
 *
 * @param  mixed $options Default options for pagination links. If a string is supplied - it
 *                        is used as the DOM id element to update. See #options for list of keys.
 */
	function options($options = array()) {
		if (is_string($options)) {
			$options = array('update' => $options);
		}

		if (!empty($options['paging'])) {
			if (!isset($this->params['paging'])) {
				$this->params['paging'] = array();
			}
			$this->params['paging'] = array_merge($this->params['paging'], $options['paging']);
			unset($options['paging']);
		}
		$model = $this->defaultModel();

		if (!empty($options[$model])) {
			if (!isset($this->params['paging'][$model])) {
				$this->params['paging'][$model] = array();
			}
			$this->params['paging'][$model] = array_merge($this->params['paging'][$model], $options[$model]);
			unset($options[$model]);
		}
		$this->options = array_filter(array_merge($this->options, $options));
	}
/**
 * Gets the current page of the recordset for the given model
 *
 * @param  string $model Optional model name.  Uses the default if none is specified.
 * @return string The current page number of the recordset.
 */
	function current($model = null) {
		$params = $this->params($model);

		if (isset($params['page'])) {
			return $params['page'];
		}
		return 1;
	}
/**
 * Gets the current key by which the recordset is sorted
 *
 * @param  string $model Optional model name.  Uses the default if none is specified.
 * @param  mixed $options Options for pagination links. See #options for list of keys.
 * @return string The name of the key by which the recordset is being sorted, or
 *                null if the results are not currently sorted.
 */
	function sortKey($model = null, $options = array()) {
		if (empty($options)) {
			$params = $this->params($model);
			$options = array_merge($params['defaults'], $params['options']);
		}

		if (isset($options['sort']) && !empty($options['sort'])) {
			return $options['sort'];
		} elseif (isset($options['order']) && is_array($options['order'])) {
			return preg_replace('/.*\./', '', key($options['order']));
		} elseif (isset($options['order']) && is_string($options['order'])) {
			if (preg_match('/(?:\w+\.)?(\w+)/', $options['order'], $result) && isset($result[1])) {
				return $result[1];
			}
		}
		return null;
	}
/**
 * Gets the current direction the recordset is sorted
 *
 * @param  string $model Optional model name.  Uses the default if none is specified.
 * @param  mixed $options Options for pagination links. See #options for list of keys.
 * @return string The direction by which the recordset is being sorted, or
 *                null if the results are not currently sorted.
 */
	function sortDir($model = null, $options = array()) {
		$dir = null;

		if (empty($options)) {
			$params = $this->params($model);
			$options = array_merge($params['defaults'], $params['options']);
		}

		if (isset($options['direction'])) {
			$dir = strtolower($options['direction']);
		} elseif (isset($options['order']) && is_array($options['order'])) {
			$dir = strtolower(current($options['order']));
		}

		if ($dir == 'desc') {
			return 'desc';
		}
		return 'asc';
	}
/**
 * Generates a "previous" link for a set of paged records
 *
 * @param  string $title Title for the link. Defaults to '<< Previous'.
 * @param  mixed $options Options for pagination link. See #options for list of keys.
 * @param  string $disabledTitle Title when the link is disabled.
 * @param  mixed $disabledOptions Options for the disabled pagination link. See #options for list of keys.
 * @return string A "previous" link or $disabledTitle text if the link is disabled.
 */
	function prev($title = '<< Previous', $options = array(), $disabledTitle = null, $disabledOptions = array()) {
		return $this->__pagingLink('Prev', $title, $options, $disabledTitle, $disabledOptions);
	}
/**
 * Generates a "next" link for a set of paged records
 *
 * @param  string $title Title for the link. Defaults to 'Next >>'.
 * @param  mixed $options Options for pagination link. See #options for list of keys.
 * @param  string $disabledTitle Title when the link is disabled.
 * @param  mixed $disabledOptions Options for the disabled pagination link. See #options for list of keys.
 * @return string A "next" link or or $disabledTitle text if the link is disabled.
 */
	function next($title = 'Next >>', $options = array(), $disabledTitle = null, $disabledOptions = array()) {
		return $this->__pagingLink('Next', $title, $options, $disabledTitle, $disabledOptions);
	}
/**
 * Generates a sorting link
 *
 * @param  string $title Title for the link.
 * @param  string $key The name of the key that the recordset should be sorted.
 * @param  array $options Options for sorting link. See #options for list of keys.
 * @return string A link sorting default by 'asc'. If the resultset is sorted 'asc' by the specified
 *                key the returned link will sort by 'desc'.
 */
	function sort($title, $key = null, $options = array()) {
		$options = array_merge(array('url' => array(), 'model' => null), $options);
		$url = $options['url'];
		unset($options['url']);

		if (empty($key)) {
			$key = $title;
			$title = __(Inflector::humanize(preg_replace('/_id$/', '', $title)), true);
		}

		$dir = 'asc';
		if ($this->sortKey($options['model']) == $key && $this->sortDir($options['model']) == 'asc') {
			$dir = 'desc';
		}
		if (is_array($title) && array_key_exists($dir, $title)) {
			$title = $title[$dir];
		}

		$url = array_merge(array('sort' => $key, 'direction' => $dir), $url, array('order' => null));
		return $this->link($title, $url, $options);
	}
/**
 * Generates a plain or Ajax link with pagination parameters
 *
 * @param  string $title Title for the link.
 * @param  mixed $url Url for the action. See Router::url()
 * @param  array $options Options for the link. See #options for list of keys.
 * @return string A link with pagination parameters.
 */
	function link($title, $url = array(), $options = array()) {
		$options = array_merge(array('model' => null, 'escape' => true), $options);
		$model = $options['model'];
		unset($options['model']);

		if (!empty($this->options)) {
			$options = array_merge($this->options, $options);
		}
		if (isset($options['url'])) {
			$url = array_merge((array)$options['url'], (array)$url);
			unset($options['url']);
		}
		$url = $this->url($url, true, $model);

		$obj = isset($options['update']) ? 'Ajax' : 'Html';
		$url = array_merge(array('page' => $this->current($model)), $url);
		return $this->{$obj}->link($title, Set::filter($url, true), $options);
	}
/**
 * Merges passed URL options with current pagination state to generate a pagination URL.
 *
 * @param  array $options Pagination/URL options array
 * @param  boolean $asArray
 * @param  string $model Which model to paginate on
 * @return mixed By default, returns a full pagination URL string for use in non-standard contexts (i.e. JavaScript)
 */
	function url($options = array(), $asArray = false, $model = null) {
		$paging = $this->params($model);
		$url = array_merge(array_filter(Set::diff(array_merge($paging['defaults'], $paging['options']), $paging['defaults'])), $options);

		if (isset($url['order'])) {
			$sort = $direction = null;
			if (is_array($url['order'])) {
				list($sort, $direction) = array($this->sortKey($model, $url), current($url['order']));
			}
			unset($url['order']);
			$url = array_merge($url, compact('sort', 'direction'));
		}

		if ($asArray) {
			return $url;
		}
		return Router::url($url);
	}
/**
 * Protected method for generating prev/next links
 *
 */
	function __pagingLink($which, $title = null, $options = array(), $disabledTitle = null, $disabledOptions = array()) {
		$check = 'has' . $which;
		$_defaults = array('url' => array(), 'step' => 1, 'escape' => true, 'model' => null, 'tag' => 'div');
		$options = array_merge($_defaults, (array)$options);
		$paging = $this->params($options['model']);

		if (!$this->{$check}() && (!empty($disabledTitle) || !empty($disabledOptions))) {
			if (!empty($disabledTitle) && $disabledTitle !== true) {
				$title = $disabledTitle;
			}
			$options = array_merge($_defaults, (array)$disabledOptions);
		} elseif (!$this->{$check}()) {
			return null;
		}

		foreach (array_keys($_defaults) as $key) {
			${$key} = $options[$key];
			unset($options[$key]);
		}
		$url = array_merge(array('page' => $paging['page'] + ($which == 'Prev' ? $step * -1 : $step)), $url);

		if ($this->{$check}()) {