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<?php |
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/** |
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* GpsLab component. |
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* |
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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/MIT |
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*/ |
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namespace GpsLab\Bundle\PaginationBundle\Service; |
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class NavigateRange |
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{ |
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/** |
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* @var Configuration |
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*/ |
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private $config; |
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/** |
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* @var int |
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*/ |
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private $left_offset = -1; |
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/** |
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* @var int |
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*/ |
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private $right_offset = -1; |
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/** |
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* @param Configuration $config |
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*/ |
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public function __construct(Configuration $config) |
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{ |
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$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 getLeftOffset() |
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{ |
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return $this->buildOffset()->left_offset; |
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} |
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/** |
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* @return int |
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*/ |
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public function getRightOffset() |
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{ |
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return $this->buildOffset()->right_offset; |
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} |
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/** |
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* @return self |
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*/ |
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private function buildOffset() |
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{ |
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if ($this->left_offset < 0) { |
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$this->definitionOffset(); |
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$this->adjustmentLargeLeftOffset(); |
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$this->adjustmentLargeRightOffset(); |
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$this->adjustmentLowerLeftOffset(); |
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} |
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return $this; |
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} |
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/** |
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* Definition of offset to the left and to the right of the selected page. |
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*/ |
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private function definitionOffset() |
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{ |
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$this->left_offset = (int) floor(($this->config->getMaxNavigate() - 1) / 2); |
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$this->right_offset = (int) ceil(($this->config->getMaxNavigate() - 1) / 2); |
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} |
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/** |
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* Adjustment, if the offset is too large left. |
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*/ |
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private function adjustmentLargeLeftOffset() |
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{ |
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if ($this->config->getCurrentPage() - $this->left_offset < 1) { |
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$offset = abs($this->config->getCurrentPage() - 1 - $this->left_offset); |
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$this->left_offset -= $offset; |
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$this->right_offset += $offset; |
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} |
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} |
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/** |
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* Adjustment, if the offset is too large right. |
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*/ |
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private function adjustmentLargeRightOffset() |
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{ |
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if ($this->config->getCurrentPage() + $this->right_offset > $this->config->getTotalPages()) { |
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$offset = abs( |
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$this->config->getTotalPages() - |
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$this->config->getCurrentPage() - |
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$this->right_offset |
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); |
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$this->left_offset += $offset; |
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$this->right_offset -= $offset; |
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} |
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} |
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/** |
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* Left offset should point not lower of the first page. |
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*/ |
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private function adjustmentLowerLeftOffset() |
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{ |
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if ($this->left_offset >= $this->config->getCurrentPage()) { |
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$this->left_offset = $this->config->getCurrentPage() - 1; |
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} |
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} |
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} |
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gpslab /
pagination-bundle
