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paginator.php

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<?php
/* SVN FILE: $Id: paginator_8php-source.html 580 2008-07-01 14:45:49Z 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: 580 $
 * @modifiedby      $LastChangedBy: gwoo $
 * @lastmodified    $Date: 2008-07-01 09:45:49 -0500 (Tue, 01 Jul 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'])) {
            if (preg_match('/(?:\w+\.)?(\w+)/', $options['sort'], $result) && isset($result[1])) {
                return $result[1];
            }
            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';
        $model = null;

        if (strpos($key, '.') !== false) {
            list($model, $key) = explode('.', $key);
            $model = $model . '.';
        }
        if ($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' => $model . $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 $url;
        }
        return parent::url($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}()) {
            return $this->link($title, $url, array_merge($options, array('escape' => $escape)));
        } else {
            return $this->Html->tag($tag, $title, $options, $escape);
        }
    }
/**
 * Returns true if the given result set is not at the first page
 *
 * @param string $model Optional model name.  Uses the default if none is specified.
 * @return boolean True if the result set is not at the first page.
 */
    function hasPrev($model = null) {
        return $this->__hasPage($model, 'prev');
    }
/**
 * Returns true if the given result set is not at the last page
 *
 * @param string $model Optional model name.  Uses the default if none is specified.
 * @return boolean True if the result set is not at the last page.
 */
    function hasNext($model = null) {
        return $this->__hasPage($model, 'next');
    }
/**
 * Returns true if the given result set has the page number given by $page
 *
 * @param  string $model Optional model name.  Uses the default if none is specified.
 * @param  int $page The page number - if not set defaults to 1.
 * @return boolean True if the given result set has the specified page number.
 */
    function hasPage($model = null, $page = 1) {
        if (is_numeric($model)) {
            $page = $model;
            $model = null;
        }
        $paging = $this->params($model);
        return $page <= $paging['pageCount'];
    }
/**
 * Protected method
 *
 */
    function __hasPage($model, $page) {
        $params = $this->params($model);
        if (!empty($params)) {
            if ($params["{$page}Page"] == true) {
                return true;
            }
        }
        return false;
    }
/**
 * Gets the default model of the paged sets
 *
 * @return string Model name or null if the pagination isn't initialized.
 */
    function defaultModel() {
        if ($this->__defaultModel != null) {
            return $this->__defaultModel;
        }
        if (empty($this->params['paging'])) {
            return null;
        }
        list($this->__defaultModel) = array_keys($this->params['paging']);
        return $this->__defaultModel;
    }
/**
 * Returns a counter string for the paged result set
 *
 * @param  mixed $options Options for the counter string. See #options for list of keys.
 * @return string Counter string.
 */
    function counter($options = array()) {
        if (is_string($options)) {
            $options = array('format' => $options);
        }

        $options = array_merge(
            array(
                'model' => $this->defaultModel(),
                'format' => 'pages',
                'separator' => ' of '
            ),
        $options);

        $paging = $this->params($options['model']);
        $paging['pageCount'] = ife($paging['pageCount'] == 0, 1, $paging['pageCount']);

        $start = ife($paging['count'] >= 1, ($paging['page'] - 1) * ($paging['options']['limit']) + 1, '0');
        $end = ife(($paging['count'] < ($start + $paging['options']['limit'] - 1)), $paging['count'], ($start + $paging['options']['limit'] - 1));

        switch ($options['format']) {
            case 'range':
                if (!is_array($options['separator'])) {
                    $options['separator'] = array(' - ', $options['separator']);
                }
                $out = $start . $options['separator'][0] . $end . $options['separator'][1] . $paging['count'];
            break;
            case 'pages':
                $out = $paging['page'] . $options['separator'] . $paging['pageCount'];
            break;
            default:
                $replace = array(
                    '%page%' => $paging['page'],
                    '%pages%' => $paging['pageCount'],
                    '%current%' => $paging['current'],
                    '%count%' => $paging['count'],
                    '%start%' => $start,
                    '%end%' => $end
                );
                $out = str_replace(array_keys($replace), array_values($replace), $options['format']);
            break;
        }
        return $this->output($out);
    }
/**
 * Returns a set of numbers for the paged result set
 * uses a modulus to decide how many numbers to show on each side of the current page (default: 8)
 *
 * @param  mixed $options Options for the numbers, (before, after, model, modulus, separator)
 * @return string numbers string.
 */
    function numbers($options = array()) {
        if ($options === true) {
            $options = array(
                        'before' => ' | ', 'after' => ' | ',
                        'first' => 'first', 'last' => 'last',
                        );
        }

        $options = array_merge(
            array(
                'before'=> null, 'after'=> null,
                'model' => $this->defaultModel(),
                'modulus' => '8', 'separator' => ' | ',
                'first' => null, 'last' => null,
            ),
        (array)$options);

        $params = array_merge(array('page'=> 1), (array)$this->params($options['model']));
        unset($options['model']);

        if ($params['pageCount'] <= 1) {
            return false;
        }

        extract($options);
        unset($options['before'], $options['after'], $options['model'], $options['modulus'], $options['separator'], $options['first'], $options['last']);

        $out = '';

        if ($modulus && $params['pageCount'] > $modulus) {
            $half = intval($modulus / 2);
            $end = $params['page'] + $half;

            if ($end > $params['pageCount']) {
                $end = $params['pageCount'];
            }
            $start = $params['page'] - ($modulus - ($end - $params['page']));
            if ($start <= 1) {
                $start = 1;
                $end = $params['page'] + ($modulus  - $params['page']) + 1;
            }

            if ($first && $start > (int)$first) {
                if ($start == $first + 1) {
                    $out .= $this->first($first, array('after' => $separator));
                } else {
                    $out .= $this->first($first);
                }
            }

            $out .= $before;

            for ($i = $start; $i < $params['page']; $i++) {
                $out .= '<span>' . $this->link($i, array('page' => $i), $options) . '</span>' . $separator;
            }

            $out .= '<span class="current">' . $params['page'] . '</span>';
            if ($i != $params['pageCount']) {
                $out .= $separator;
            }

            $start = $params['page'] + 1;
            for ($i = $start; $i < $end; $i++) {
                $out .= '<span>' .$this->link($i, array('page' => $i), $options) . '</span>'. $separator;
            }

            if ($end != $params['page']) {
                $out .= '<span>' .$this->link($i, array('page' => $end), $options) . '</span>';
            }

            $out .= $after;

            if ($last && $end <= $params['pageCount'] - (int)$last) {
                if ($end + 1 == $params['pageCount']) {
                    $out .= $this->last($last, array('before' => $separator));
                } else {
                    $out .= $this->last($last);
                }
            }

        } else {
            $out .= $before;

            for ($i = 1; $i <= $params['pageCount']; $i++) {
                if ($i == $params['page']) {
                    $out .= '<span class="current">' . $i . '</span>';
                } else {
                    $out .= '<span>' .$this->link($i, array('page' => $i), $options) . '</span>';
                }
                if ($i != $params['pageCount']) {
                    $out .= $separator;
                }
            }

            $out .= $after;
        }

        return $this->output($out);
    }
/**
 * Returns a first or set of numbers for the first pages
 *
 * @param  mixed $first if string use as label for the link, if numeric print page numbers
 * @param  mixed $options
 * @return string numbers string.
 */
    function first($first = '<< first', $options = array()) {
        $options = array_merge(
            array(
                'after'=> null,
                'model' => $this->defaultModel(),
                'separator' => ' | ',
            ),
        (array)$options);

        $params = array_merge(array('page'=> 1), (array)$this->params($options['model']));
        unset($options['model']);

        if ($params['pageCount'] <= 1) {
            return false;
        }
        extract($options);
        unset($options['after'], $options['model'], $options['separator']);

        $out = '';

        if (is_int($first) && $params['page'] > $first) {
            if ($after === null) {
                $after = '...';
            }
            for ($i = 1; $i <= $first; $i++) {
                $out .= '<span>' . $this->link($i, array('page' => $i), $options) . '</span>';
                if ($i != $first) {
                    $out .= $separator;
                }
            }
            $out .= $after;
        } elseif ($params['page'] > 1) {
            $out = '<span>' . $this->link($first, array('page' => 1), $options) . '</span>' . $after;
        }
        return $out;
    }
/**
 * Returns a last or set of numbers for the last pages
 *
 * @param  mixed $last if string use as label for the link, if numeric print page numbers
 * @param  mixed $options
 * @return string numbers string.
 */
    function last($last = 'last >>', $options = array()) {
        $options = array_merge(
            array(
                'before'=> null,
                'model' => $this->defaultModel(),
                'separator' => ' | ',
            ),
        (array)$options);

        $params = array_merge(array('page'=> 1), (array)$this->params($options['model']));
        unset($options['model']);

        if ($params['pageCount'] <= 1) {
            return false;
        }

        extract($options);
        unset($options['before'], $options['model'], $options['separator']);

        $out = '';
        $lower = $params['pageCount'] - $last + 1;

        if (is_int($last) && $params['page'] < $lower) {
            if ($before === null) {
                $before = '...';
            }
            for ($i = $lower; $i <= $params['pageCount']; $i++) {
                $out .= '<span>' . $this->link($i, array('page' => $i), $options) . '</span>';
                if ($i != $params['pageCount']) {
                    $out .= $separator;
                }
            }
            $out = $before . $out;
        } elseif ($params['page'] < $params['pageCount']) {
            $out = $before . '<span>' . $this->link($last, array('page' => $params['pageCount']), $options) . '</span>';
        }
        return $out;
    }
}
?>

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