AphrontCursorPagerView.php
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	<?php

	final class AphrontCursorPagerView extends AphrontView {

	private $afterID;
	private $beforeID;

	private $pageSize = 100;

	private $nextPageID;
	private $prevPageID;
	private $moreResults;

	private $uri;

	public function setPageSize($page_size) {
	$this->pageSize = max(1, $page_size);
	return $this;
	}

	public function getPageSize() {
	return $this->pageSize;
	}

	public function setURI(PhutilURI $uri) {
	$this->uri = $uri;
	return $this;
	}

	public function readFromRequest(AphrontRequest $request) {
	$this->uri = $request->getRequestURI();
	$this->afterID = $request->getStr('after');
	$this->beforeID = $request->getStr('before');
	return $this;
	}

	public function setAfterID($after_id) {
	$this->afterID = $after_id;
	return $this;
	}

	public function getAfterID() {
	return $this->afterID;
	}

	public function setBeforeID($before_id) {
	$this->beforeID = $before_id;
	return $this;
	}

	public function getBeforeID() {
	return $this->beforeID;
	}

	public function setNextPageID($next_page_id) {
	$this->nextPageID = $next_page_id;
	return $this;
	}

	public function getNextPageID() {
	return $this->nextPageID;
	}

	public function setPrevPageID($prev_page_id) {
	$this->prevPageID = $prev_page_id;
	return $this;
	}

	public function getPrevPageID() {
	return $this->prevPageID;
	}

	public function sliceResults(array $results) {
	if (count($results) > $this->getPageSize()) {
	$page_size = (int)$this->getPageSize();
	$offset = ($this->beforeID ? count($results) - $page_size : 0);
	$results = array_slice($results, $offset, $page_size, true);
	$this->moreResults = true;
	}
	return $results;
	}

	public function getHasMoreResults() {
	return $this->moreResults;
	}

	public function willShowPagingControls() {
	return $this->prevPageID \|\|
	$this->nextPageID \|\|
	$this->afterID \|\|
	($this->beforeID && $this->moreResults);
	}

	public function getFirstPageURI() {
	if (!$this->uri) {
	throw new PhutilInvalidStateException('setURI');
	}

	if (!$this->afterID && !($this->beforeID && $this->moreResults)) {
	return null;
	}

	return id(clone $this->uri)
	->removeQueryParam('after')
	->removeQueryParam('before');
	}

	public function getPrevPageURI() {
	if (!$this->uri) {
	throw new PhutilInvalidStateException('getPrevPageURI');
	}

	if (!$this->prevPageID) {
	return null;
	}

	return id(clone $this->uri)
	->removeQueryParam('after')
	->replaceQueryParam('before', $this->prevPageID);
	}

	public function getNextPageURI() {
	if (!$this->uri) {
	throw new PhutilInvalidStateException('setURI');
	}

	if (!$this->nextPageID) {
	return null;
	}

	return id(clone $this->uri)
	->replaceQueryParam('after', $this->nextPageID)
	->removeQueryParam('before');
	}

	public function render() {
	if (!$this->uri) {
	throw new PhutilInvalidStateException('setURI');
	}

	$links = array();

	$first_uri = $this->getFirstPageURI();
	if ($first_uri) {
	$icon = id(new PHUIIconView())
	->setIcon('fa-fast-backward');
	$links[] = id(new PHUIButtonView())
	->setTag('a')
	->setHref($first_uri)
	->setIcon($icon)
	->addClass('mml')
	->setColor(PHUIButtonView::GREY)
	->setText(pht('First'));
	}

	$prev_uri = $this->getPrevPageURI();
	if ($prev_uri) {
	$icon = id(new PHUIIconView())
	->setIcon('fa-backward');
	$links[] = id(new PHUIButtonView())
	->setTag('a')
	->setHref($prev_uri)
	->setIcon($icon)
	->addClass('mml')
	->setColor(PHUIButtonView::GREY)
	->setText(pht('Prev'));
	}

	$next_uri = $this->getNextPageURI();
	if ($next_uri) {
	$icon = id(new PHUIIconView())
	->setIcon('fa-forward');
	$links[] = id(new PHUIButtonView())
	->setTag('a')
	->setHref($next_uri)
	->setIcon($icon, false)
	->addClass('mml')
	->setColor(PHUIButtonView::GREY)
	->setText(pht('Next'));
	}

	return phutil_tag(
	'div',
	array(
	'class' => 'phui-pager-view',
	),
	$links);
	}

	}

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