list_bullet_positioner.cls.php
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<?php
/**
* DOMPDF - PHP5 HTML to PDF renderer
*
* File: $RCSfile: list_bullet_positioner.cls.php,v $
* Created on: 2004-06-23
*
* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library in the file LICENSE.LGPL; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
* Alternatively, you may distribute this software under the terms of the
* PHP License, version 3.0 or later. A copy of this license should have
* been distributed with this file in the file LICENSE.PHP . If this is not
* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
*
* The latest version of DOMPDF might be available at:
* http://www.dompdf.com/
*
* @link http://www.dompdf.com/
* @copyright 2004 Benj Carson
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @contributor Helmut Tischer <htischer@weihenstephan.org>
* @package dompdf
*
* Changes
* @contributor Helmut Tischer <htischer@weihenstephan.org>
* @version 20090622
* - try to adjust top position of bullet to top corner of subsequent font
*/
/* $Id: list_bullet_positioner.cls.php 216 2010-03-11 22:49:18Z ryan.masten $ */
/**
* Positions list bullets
*
* @access private
* @package dompdf
*/
class List_Bullet_Positioner extends Positioner {
function __construct(Frame_Decorator $frame) { parent::__construct($frame); }
//........................................................................
function position() {
// Bullets & friends are positioned an absolute distance to the left of
// the content edge of their parent element
$cb = $this->_frame->get_containing_block();
$style = $this->_frame->get_style();
// Note: this differs from most frames in that we must position
// ourselves after determining our width
$x = $cb["x"] - $this->_frame->get_width();
$p = $this->_frame->find_block_parent();
$y = $p->get_current_line("y");
// This is a bit of a hack...
$n = $this->_frame->get_next_sibling();
if ( $n ) {
$style = $n->get_style();
$y += $style->length_in_pt( array($style->margin_top, $style->padding_top),
$n->get_containing_block("w") );
}
// Now the position is the left top of the block which should be marked with the bullet.
// We tried to find out the y of the start of the first text character within the block.
// But the top margin/padding does not fit, neither from this nor from the next sibling
// The "bit of a hack" above does not work also.
// Instead let's position the bullet vertically centered to the block which should be marked.
// But for get_next_sibling() the get_containing_block is all zero, and for find_block_parent()
// the get_containing_block is paper width and the entire list as height.
// if ($p) {
// //$cb = $n->get_containing_block();
// $cb = $p->get_containing_block();
// $y += $cb["h"]/2;
// print 'cb:'.$cb["x"].':'.$cb["y"].':'.$cb["w"].':'.$cb["h"].':';
// }
// Todo:
// For now give up on the above. Use Guesswork with font y-pos in the middle of the line spacing
$style = $p->get_style();
$font_size = $style->get_font_size();
$line_height = $style->length_in_pt($style->line_height, $font_size);
$y += ($line_height - $font_size) / 2;
//Position is x-end y-top of character position of the bullet.
$this->_frame->set_position($x, $y);
}
}