cavepaintingsFork/core/paginator.class.php

<?php

class Paginator extends Block {
	var $header = null;
	var $body = "";

	public function Paginator($page, $query, $page_number, $total_pages) {
		$this->body = $this->build_paginator($page_number, $total_pages, $page, $query);
	}

	private function gen_page_link($base_url, $query, $page, $name) {
		$link = make_link("$base_url/$page", $query);
	    return "<a href='$link'>$name</a>";
	}
	
	private function gen_page_link_block($base_url, $query, $page, $current_page, $name) {
		$paginator = "";
	    if($page == $current_page) $paginator .= "<b>";
	    $paginator .= $this->gen_page_link($base_url, $query, $page, $name);
	    if($page == $current_page) $paginator .= "</b>";
	    return $paginator;
	}
					
	private function build_paginator($current_page, $total_pages, $base_url, $query) {
		$next = $current_page + 1;
		$prev = $current_page - 1;
		$rand = rand(1, $total_pages);

		$at_start = ($current_page <= 1 || $total_pages <= 1);
		$at_end = ($current_page >= $total_pages);

		$first_html  = $at_start ? "First" : $this->gen_page_link($base_url, $query, 1,            "First");
		$prev_html   = $at_start ? "Prev"  : $this->gen_page_link($base_url, $query, $prev,        "Prev");
		$random_html =                       $this->gen_page_link($base_url, $query, $rand,        "Random");
		$next_html   = $at_end   ? "Next"  : $this->gen_page_link($base_url, $query, $next,        "Next");
		$last_html   = $at_end   ? "Last"  : $this->gen_page_link($base_url, $query, $total_pages, "Last");

		$start = $current_page-5 > 1 ? $current_page-5 : 1;
		$end = $start+10 < $total_pages ? $start+10 : $total_pages;

		$pages = array();
		foreach(range($start, $end) as $i) {
			$pages[] = $this->gen_page_link_block($base_url, $query, $i, $current_page, $i);
		}
		$pages_html = implode(" | ", $pages);

		return "<p>$first_html | $prev_html | $random_html | $next_html | $last_html".
				"<br>&lt;&lt; $pages_html &gt;&gt;</p>";
	}
}