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<?php
/**
* @package dompdf
* @link http://dompdf.github.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @author Helmut Tischer <htischer@weihenstephan.org>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
/**
* 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();
// 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_box()->y;
// This is a bit of a hack...
$n = $this->_frame->get_next_sibling();
if ( $n ) {
$style = $n->get_style();
$line_height = $style->length_in_pt($style->line_height, $style->get_font_size());
$offset = $style->length_in_pt($line_height, $n->get_containing_block("h")) - $this->_frame->get_height();
$y += $offset / 2;
}
// Now the position is the left top of the block which should be marked with the bullet.
// We tried to find out the y of the start of the first text character within the block.
// But the top margin/padding does not fit, neither from this nor from the next sibling
// The "bit of a hack" above does not work also.
// Instead let's position the bullet vertically centered to the block which should be marked.
// But for get_next_sibling() the get_containing_block is all zero, and for find_block_parent()
// the get_containing_block is paper width and the entire list as height.
// if ($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);
}
}
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