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<?php |
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/** |
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* AnimeDb package |
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* |
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* @package AnimeDb |
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* @author Peter Gribanov <[email protected]> |
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* @copyright Copyright (c) 2011, Peter Gribanov |
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* @license http://opensource.org/licenses/GPL-3.0 GPL v3 |
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*/ |
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namespace AnimeDb\Bundle\PaginationBundle\Service; |
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use AnimeDb\Bundle\PaginationBundle\Entity\Node; |
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use Doctrine\Common\Collections\ArrayCollection; |
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/** |
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* @package AnimeDb\Bundle\PaginationBundle\Service |
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* @author Peter Gribanov <[email protected]> |
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*/ |
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class View implements \IteratorAggregate |
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{ |
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/** |
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* @var Configuration |
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*/ |
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protected $config; |
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/** |
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* @var Node|null |
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*/ |
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protected $first = null; |
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/** |
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* @var Node|null |
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*/ |
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protected $prev = null; |
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/** |
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* @var Node |
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*/ |
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protected $current; |
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/** |
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* @var Node|null |
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*/ |
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protected $next = null; |
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/** |
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* @var Node|null |
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*/ |
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protected $last = null; |
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/** |
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* @var ArrayCollection|null |
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*/ |
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protected $list = null; |
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/** |
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* @param Configuration $config |
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*/ |
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public function __construct(Configuration $config) { |
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$this->config = $config; |
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} |
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/** |
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* @return int |
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*/ |
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public function getTotal() |
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{ |
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return $this->config->getTotalPages(); |
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} |
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/** |
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* @return Node|null |
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*/ |
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public function getFirst() |
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{ |
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if (!$this->first && $this->config->getCurrentPage() > 1) { |
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$this->first = new Node(1, $this->buildLink(1)); |
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} |
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return $this->first; |
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} |
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/** |
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* @return Node|null |
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*/ |
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public function getPrev() |
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{ |
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if (!$this->prev && $this->config->getCurrentPage() > 1) { |
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$this->prev = new Node( |
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$this->config->getCurrentPage() - 1, |
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$this->buildLink($this->config->getCurrentPage() - 1) |
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); |
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} |
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return $this->prev; |
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} |
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/** |
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* @return Node |
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*/ |
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public function getCurrent() |
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{ |
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if (!$this->current) { |
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$this->current = new Node( |
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$this->config->getCurrentPage(), |
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$this->buildLink($this->config->getCurrentPage()), |
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true |
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); |
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} |
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return $this->current; |
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} |
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/** |
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* @return Node|null |
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*/ |
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public function getNext() |
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{ |
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if (!$this->next && $this->config->getCurrentPage() < $this->getTotal()) { |
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$this->next = new Node( |
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$this->config->getCurrentPage() + 1, |
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$this->buildLink($this->config->getCurrentPage() + 1) |
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); |
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} |
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return $this->next; |
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} |
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/** |
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* @return Node|null |
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*/ |
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public function getLast() |
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{ |
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if (!$this->last && $this->config->getCurrentPage() < $this->getTotal()) { |
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$this->last = new Node($this->getTotal(), $this->buildLink($this->getTotal())); |
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} |
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return $this->last; |
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} |
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/** |
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* @return ArrayCollection|null |
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*/ |
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public function getIterator() |
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{ |
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if (!($this->list instanceof ArrayCollection)) { |
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$this->list = new ArrayCollection(); |
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if ($this->getTotal() <= 1) { |
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return $this->list; |
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} |
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list($page_from, $page_to) = $this->getNavigateRange(); |
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// build list |
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for ($page = $page_from; $page <= $page_to; $page++) { |
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if ($page == $this->config->getCurrentPage()) { |
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$this->list->add($this->getCurrent()); |
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} else { |
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$this->list->add(new Node($page, $this->buildLink($page))); |
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} |
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} |
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} |
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return $this->list; |
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} |
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/** |
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* @param int $page |
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* |
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* @return string |
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*/ |
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protected function buildLink($page) |
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{ |
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if ($page == 1 && $this->config->getFirstPageLink()) { |
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return $this->config->getFirstPageLink(); |
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} |
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if (is_callable($this->config->getPageLink())) { |
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return call_user_func($this->config->getPageLink(), $page); |
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} else { |
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return sprintf($this->config->getPageLink(), $page); |
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} |
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} |
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/** |
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* @return int[] |
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*/ |
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protected function getNavigateRange() |
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{ |
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// definition of offset to the left and to the right of the selected page |
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$left_offset = floor(($this->config->getMaxNavigate() - 1) / 2); |
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$right_offset = ceil(($this->config->getMaxNavigate() - 1) / 2); |
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// adjustment, if the offset is too large left |
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if ($this->config->getCurrentPage() - $left_offset < 1) { |
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3 |
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$offset = abs($this->config->getCurrentPage() - 1 - $left_offset); |
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3 |
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$left_offset = $left_offset - $offset; |
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$right_offset = $right_offset + $offset; |
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} |
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// adjustment, if the offset is too large right |
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if ($this->config->getCurrentPage() + $right_offset > $this->getTotal()) { |
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3 |
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$offset = abs($this->getTotal() - $this->config->getCurrentPage() - $right_offset); |
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$left_offset = $left_offset + $offset; |
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$right_offset = $right_offset - $offset; |
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} |
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// determining the first and last pages in paging based on the current page and offset |
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$page_from = $this->config->getCurrentPage() - $left_offset; |
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$page_to = $this->config->getCurrentPage() + $right_offset; |
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$page_from = $page_from > 1 ? $page_from : 1; |
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return [ |
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$page_from, |
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$page_to |
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]; |
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} |
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} |
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anime-db /
pagination-bundle
