<?php
class Paginator
{
	var $_slice_size = 26;
	var $_slice_num = 1;

	function Paginator($slice_size=26, $slice_num=1)
	{
		$this->_slice_size = max(1, min(26, (float)$slice_size));
		$this->_slice_num = max(1, min(26, (int)$slice_num));
	}

	function getCurrentSliceStartEnd()
	{
		$x = 'A';
		$y = chr(round(min(ord('Z'), ord($x) + $this->_slice_size)));
		$i = 1;
		while ($y != 'Z' && $i < 26) {
			$y = chr(min(ord('Z'), ord('A') + (($i) * $this->_slice_size)));
			if ($i == $this->_slice_num) {
				return Array($x, $y);
			}
			$x = chr(ord($y) + 1);
			$i++;
		}
		return Array($x, 'Z');
	}

	function printPageNav()
	{
		$x = 'A';
		$y = chr(round(min(ord('Z'), ord($x) + $this->_slice_size)));
		$i = 1;
		while ($y != 'Z' && $i < 26) {
			$y = chr(min(ord('Z'), ord('A') + (($i) * $this->_slice_size)));
			if ($i != $this->_slice_num) {
				echo '<a href="'.build_url(Array('slice_size' => round($this->_slice_size, 1), 'slice_num' => $i)).'">';
			} else {
				echo '<strong>';
			}
			echo $x.' - '.$y;
			if ($i != $this->_slice_num) {
				echo '</a>';
			} else {
				echo '</strong>';
			}
			echo '&nbsp;&nbsp;&nbsp;&nbsp;';
			$x = chr(ord($y) + 1);
			$i++;
		} 
	}

}