<?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


 */





namespace Dompdf\Positioner;





use Dompdf\FrameDecorator\AbstractFrameDecorator;





/**


 * Positions list bullets


 *


 * @package dompdf


 */


class ListBullet extends AbstractPositioner


{





    /**


     * @param AbstractFrameDecorator $frame


     */


    function position(AbstractFrameDecorator $frame)


    {





        // Bullets & friends are positioned an absolute distance to the left of


        // the content edge of their parent element


        $cb = $frame->get_containing_block();





        // Note: this differs from most frames in that we must position


        // ourselves after determining our width


        $x = $cb["x"] - $frame->get_width();





        $p = $frame->find_block_parent();





        $y = $p->get_current_line_box()->y;





        // This is a bit of a hack...


        $n = $frame->get_next_sibling();


        if ($n) {


            $style = $n->get_style();


            $line_height = $style->line_height;


            // TODO: should offset take into account the line height of the next sibling (per previous logic)?


            // $offset = (float)$style->length_in_pt($line_height, $n->get_containing_block("h")) - $frame->get_height();


            $offset = $line_height - $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->font_size;


        $line_height = (float)$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.


        $frame->set_position($x, $y);


    }


}


