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410 lines
9.7 KiB
410 lines
9.7 KiB
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: zhangyajun <448901948@qq.com>
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// +----------------------------------------------------------------------
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namespace think;
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use ArrayAccess;
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use ArrayIterator;
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use Countable;
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use IteratorAggregate;
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use JsonSerializable;
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use Traversable;
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abstract class Paginator implements ArrayAccess, Countable, IteratorAggregate, JsonSerializable
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{
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/** @var bool 是否为简洁模式 */
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protected $simple = false;
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/** @var Collection 数据集 */
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protected $items;
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/** @var integer 当前页 */
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protected $currentPage;
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/** @var integer 最后一页 */
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protected $lastPage;
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/** @var integer|null 数据总数 */
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protected $total;
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/** @var integer 每页的数量 */
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protected $listRows;
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/** @var bool 是否有下一页 */
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protected $hasMore;
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/** @var array 一些配置 */
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protected $options = [
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'var_page' => 'page',
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'path' => '/',
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'query' => [],
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'fragment' => '',
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];
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/** @var mixed simple模式下的下个元素 */
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protected $nextItem;
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public function __construct($items, $listRows, $currentPage = null, $total = null, $simple = false, $options = [])
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{
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$this->options = array_merge($this->options, $options);
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$this->options['path'] = '/' != $this->options['path'] ? rtrim($this->options['path'], '/') : $this->options['path'];
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$this->simple = $simple;
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$this->listRows = $listRows;
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if (!$items instanceof Collection) {
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$items = Collection::make($items);
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}
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if ($simple) {
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$this->currentPage = $this->setCurrentPage($currentPage);
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$this->hasMore = count($items) > ($this->listRows);
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if ($this->hasMore) {
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$this->nextItem = $items->slice($this->listRows, 1);
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}
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$items = $items->slice(0, $this->listRows);
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} else {
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$this->total = $total;
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$this->lastPage = (int) ceil($total / $listRows);
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$this->currentPage = $this->setCurrentPage($currentPage);
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$this->hasMore = $this->currentPage < $this->lastPage;
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}
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$this->items = $items;
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}
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/**
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* @param $items
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* @param $listRows
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* @param null $currentPage
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* @param bool $simple
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* @param null $total
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* @param array $options
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* @return Paginator
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*/
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public static function make($items, $listRows, $currentPage = null, $total = null, $simple = false, $options = [])
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{
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return new static($items, $listRows, $currentPage, $total, $simple, $options);
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}
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protected function setCurrentPage($currentPage)
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{
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if (!$this->simple && $currentPage > $this->lastPage) {
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return $this->lastPage > 0 ? $this->lastPage : 1;
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}
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return $currentPage;
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}
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/**
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* 获取页码对应的链接
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*
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* @param $page
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* @return string
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*/
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protected function url($page)
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{
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if ($page <= 0) {
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$page = 1;
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}
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if (strpos($this->options['path'], '[PAGE]') === false) {
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$parameters = [$this->options['var_page'] => $page];
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$path = $this->options['path'];
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} else {
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$parameters = [];
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$path = str_replace('[PAGE]', $page, $this->options['path']);
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}
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if (count($this->options['query']) > 0) {
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$parameters = array_merge($this->options['query'], $parameters);
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}
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$url = $path;
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if (!empty($parameters)) {
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$url .= '?' . http_build_query($parameters, null, '&');
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}
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return $url . $this->buildFragment();
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}
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/**
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* 自动获取当前页码
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* @param string $varPage
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* @param int $default
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* @return int
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*/
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public static function getCurrentPage($varPage = 'page', $default = 1)
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{
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$page = (int) Request::instance()->param($varPage);
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if (filter_var($page, FILTER_VALIDATE_INT) !== false && $page >= 1) {
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return $page;
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}
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return $default;
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}
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/**
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* 自动获取当前的path
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* @return string
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*/
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public static function getCurrentPath()
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{
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return Request::instance()->baseUrl();
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}
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public function total()
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{
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if ($this->simple) {
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throw new \DomainException('not support total');
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}
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return $this->total;
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}
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public function listRows()
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{
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return $this->listRows;
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}
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public function currentPage()
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{
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return $this->currentPage;
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}
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public function lastPage()
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{
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if ($this->simple) {
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throw new \DomainException('not support last');
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}
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return $this->lastPage;
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}
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/**
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* 数据是否足够分页
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* @return boolean
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*/
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public function hasPages()
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{
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return !(1 == $this->currentPage && !$this->hasMore);
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}
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/**
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* 创建一组分页链接
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*
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* @param int $start
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* @param int $end
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* @return array
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*/
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public function getUrlRange($start, $end)
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{
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$urls = [];
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for ($page = $start; $page <= $end; $page++) {
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$urls[$page] = $this->url($page);
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}
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return $urls;
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}
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/**
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* 设置URL锚点
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*
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* @param string|null $fragment
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* @return $this
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*/
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public function fragment($fragment)
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{
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$this->options['fragment'] = $fragment;
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return $this;
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}
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/**
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* 添加URL参数
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*
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* @param array|string $key
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* @param string|null $value
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* @return $this
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*/
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public function appends($key, $value = null)
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{
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if (!is_array($key)) {
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$queries = [$key => $value];
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} else {
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$queries = $key;
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}
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foreach ($queries as $k => $v) {
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if ($k !== $this->options['var_page']) {
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$this->options['query'][$k] = $v;
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}
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}
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return $this;
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}
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/**
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* 构造锚点字符串
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*
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* @return string
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*/
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protected function buildFragment()
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{
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return $this->options['fragment'] ? '#' . $this->options['fragment'] : '';
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}
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/**
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* 渲染分页html
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* @return mixed
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*/
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abstract public function render();
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public function items()
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{
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return $this->items->all();
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}
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public function getCollection()
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{
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return $this->items;
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}
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public function isEmpty()
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{
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return $this->items->isEmpty();
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}
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/**
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* 给每个元素执行个回调
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*
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* @param callable $callback
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* @return $this
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*/
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public function each(callable $callback)
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{
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foreach ($this->items as $key => $item) {
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$result = $callback($item, $key);
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if (false === $result) {
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break;
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} elseif (!is_object($item)) {
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$this->items[$key] = $result;
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}
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}
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return $this;
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}
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/**
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* Retrieve an external iterator
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* @return Traversable An instance of an object implementing <b>Iterator</b> or
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* <b>Traversable</b>
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*/
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public function getIterator()
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{
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return new ArrayIterator($this->items->all());
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}
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/**
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* Whether a offset exists
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* @param mixed $offset
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* @return bool
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*/
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public function offsetExists($offset)
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{
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return $this->items->offsetExists($offset);
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}
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/**
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* Offset to retrieve
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* @param mixed $offset
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* @return mixed
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*/
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public function offsetGet($offset)
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{
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return $this->items->offsetGet($offset);
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}
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/**
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* Offset to set
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* @param mixed $offset
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* @param mixed $value
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*/
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public function offsetSet($offset, $value)
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{
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$this->items->offsetSet($offset, $value);
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}
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/**
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* Offset to unset
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* @param mixed $offset
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* @return void
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* @since 5.0.0
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*/
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public function offsetUnset($offset)
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{
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$this->items->offsetUnset($offset);
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}
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/**
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* Count elements of an object
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*/
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public function count()
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{
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return $this->items->count();
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}
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public function __toString()
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{
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return (string) $this->render();
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}
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public function toArray()
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{
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if ($this->simple) {
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return [
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'per_page' => $this->listRows,
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'current_page' => $this->currentPage,
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'has_more' => $this->hasMore,
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'next_item' => $this->nextItem,
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'data' => $this->items->toArray(),
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];
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} else {
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return [
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'total' => $this->total,
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'per_page' => $this->listRows,
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'current_page' => $this->currentPage,
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'last_page' => $this->lastPage,
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'data' => $this->items->toArray(),
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];
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}
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}
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/**
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* Specify data which should be serialized to JSON
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*/
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public function jsonSerialize()
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{
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return $this->toArray();
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}
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public function __call($name, $arguments)
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{
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$collection = $this->getCollection();
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$result = call_user_func_array([$collection, $name], $arguments);
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if ($result === $collection) {
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return $this;
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}
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return $result;
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}
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}
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