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File: GeneralPagingFeature.inc.php
<?php

/**
 * @file classes/controllers/grid/feature/GeneralPagingFeature.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class GeneralPagingFeature
 * @ingroup controllers_grid_feature
 *
 * @brief Base class that implements common functionality for
 * paging features.
 *
 */

import('lib.pkp.classes.controllers.grid.feature.GridFeature');

class GeneralPagingFeature extends GridFeature {

	/** @var ItemIterator */
	private $_itemIterator;

	/** @var itemsPerPage */
	private $_itemsPerPage;

	/**
	 * @see GridFeature::GridFeature()
	 * @param $id string Feature identifier.
	 * @param $itemsPerPage null|int Optional Number of items to show at
	 * the first time. 
	 * Constructor.
	 */
	function __construct($id, $itemsPerPage = null) {
		$this->_itemsPerPage = $itemsPerPage;
		parent::__construct($id);
	}


	//
	// Getters and setters.
	//
	/**
	 * Get item iterator.
	 * @return ItemIterator
	 */
	function getItemIterator() {
		return $this->_itemIterator;
	}


	//
	// Extended GridFeature methods.
	//
	/**
	 * @copydoc GridFeature::setOptions()
	 */
	function setOptions($request, $grid) {
		// Get the default items per page setting value.
		$rangeInfo = PKPHandler::getRangeInfo($request, $grid->getId());
		$iterator = $this->getItemIterator();
		$defaultItemsPerPage = $rangeInfo->getCount();

		// Check for a component level items per page setting.
		$componentItemsPerPage = $request->getUserVar($this->_getItemsPerPageParamName($grid->getId()));
		if (!$componentItemsPerPage) $componentItemsPerPage = $this->_itemsPerPage;
 
		if ($componentItemsPerPage) {
			$currentItemsPerPage = $componentItemsPerPage;
		} else {
			$currentItemsPerPage = $defaultItemsPerPage;
		}

		$this->addOptions([
			'itemsPerPageParamName' => $this->_getItemsPerPageParamName($grid->getId()),
			'defaultItemsPerPage' => $defaultItemsPerPage,
			'currentItemsPerPage' => $currentItemsPerPage,
			'itemsTotal' => $iterator->getCount(),
			'pageParamName' => PKPHandler::getPageParamName($grid->getId()),
			'currentPage' => $iterator->getPage()
		]);

		parent::setOptions($request, $grid);
	}


	//
	// Hooks implementation.
	//
	/*
	 * @copydoc GridFeature::gridInitialize()
	 * The feature will know about the current filter
	 * value so it can request grid refreshes keeping
	 * the filter.
	 */
	function getGridDataElements($args) {
		$filter = $args['filter'];

		if (is_array($filter) && !empty($filter)) {
			$this->addOptions(['filter' => json_encode($filter)]);
		}
	}


	/**
	 * @copydoc GridFeature::setGridDataElements()
	 */
	function setGridDataElements($args) {
		$grid =& $args['grid'];
		$data =& $args['data'];

		if (is_array($data)) {
			import('lib.pkp.classes.core.ArrayItemIterator');
			$request = Application::get()->getRequest();
			$rangeInfo = $grid->getGridRangeInfo($request, $grid->getId());
			$itemIterator = new ArrayItemIterator($data, $rangeInfo->getPage(), $rangeInfo->getCount());
			$this->_itemIterator = $itemIterator;
			$data = $itemIterator->toArray();
		} elseif (is_a($data, 'ItemIterator')) {
			$this->_itemIterator = $data;
		}
	}

	/**
	 * @copydoc GridFeature::getRequestArgs()
	 */
	function getRequestArgs($args) {
		$grid = $args['grid'];
		$requestArgs =& $args['requestArgs'];

		// Add paging info so grid actions will not lose paging context.
		// Only works if grid link actions use the getRequestArgs
		// returned content.
		$request = Application::get()->getRequest();
		$rangeInfo = $grid->getGridRangeInfo($request, $grid->getId());
		$requestArgs[GridHandler::getPageParamName($grid->getId())] = $rangeInfo->getPage();
		$requestArgs[$this->_getItemsPerPageParamName($grid->getId())] = $rangeInfo->getCount();
	}

	/**
	 * @copydoc GridFeature::getGridRangeInfo()
	 */
	function getGridRangeInfo($args) {
		$request = $args['request'];
		$grid = $args['grid'];
		$rangeInfo = $args['rangeInfo'];

		// Add grid level items per page setting, if any.
		$itemsPerPage = $request->getUserVar($this->_getItemsPerPageParamName($grid->getId()));
		if ($this->_itemsPerPage) $itemsPerPage = $this->_itemsPerPage; // Feature config overrides. 
		if ($itemsPerPage) {
			$rangeInfo->setCount($itemsPerPage);
		}
	}


	//
	// Private helper methods.
	//
	/**
	 * Get the range info items per page parameter name.
	 * @param $rangeName string
	 * @return string
	 */
	private function _getItemsPerPageParamName($rangeName) {
		return $rangeName . 'ItemsPerPage';
	}
}