vendor/dompdf/dompdf/src/Positioner/ListBullet.php

   1 <?php
   2 /**
   3  * @package dompdf
   4  * @link    http://dompdf.github.com/
   5  * @author  Benj Carson <benjcarson@digitaljunkies.ca>
   6  * @author  Helmut Tischer <htischer@weihenstephan.org>
   7  * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
   8  */
   9
  10 namespace Dompdf\Positioner;
  11
  12 use Dompdf\FrameDecorator\AbstractFrameDecorator;
  13
  14 /**
  15  * Positions list bullets
  16  *
  17  * @package dompdf
  18  */
  19 class ListBullet extends AbstractPositioner
  20 {
  21
  22     /**
  23      * @param AbstractFrameDecorator $frame
  24      */
  25     function position(AbstractFrameDecorator $frame)
  26     {
  27
  28         // Bullets & friends are positioned an absolute distance to the left of
  29         // the content edge of their parent element
  30         $cb = $frame->get_containing_block();
  31
  32         // Note: this differs from most frames in that we must position
  33         // ourselves after determining our width
  34         $x = $cb["x"] - $frame->get_width();
  35
  36         $p = $frame->find_block_parent();
  37
  38         $y = $p->get_current_line_box()->y;
  39
  40         // This is a bit of a hack...
  41         $n = $frame->get_next_sibling();
  42         if ($n) {
  43             $style = $n->get_style();
  44             $line_height = $style->length_in_pt($style->line_height, $style->get_font_size());
  45             $offset = (float)$style->length_in_pt($line_height, $n->get_containing_block("h")) - $frame->get_height();
  46             $y += $offset / 2;
  47         }
  48
  49         // Now the position is the left top of the block which should be marked with the bullet.
  50         // We tried to find out the y of the start of the first text character within the block.
  51         // But the top margin/padding does not fit, neither from this nor from the next sibling
  52         // The "bit of a hack" above does not work also.
  53
  54         // Instead let's position the bullet vertically centered to the block which should be marked.
  55         // But for get_next_sibling() the get_containing_block is all zero, and for find_block_parent()
  56         // the get_containing_block is paper width and the entire list as height.
  57
  58         // if ($p) {
  59         //   //$cb = $n->get_containing_block();
  60         //   $cb = $p->get_containing_block();
  61         //   $y += $cb["h"]/2;
  62         // print 'cb:'.$cb["x"].':'.$cb["y"].':'.$cb["w"].':'.$cb["h"].':';
  63         // }
  64
  65         // Todo:
  66         // For now give up on the above. Use Guesswork with font y-pos in the middle of the line spacing
  67
  68         /*$style = $p->get_style();
  69         $font_size = $style->get_font_size();
  70         $line_height = (float)$style->length_in_pt($style->line_height, $font_size);
  71         $y += ($line_height - $font_size) / 2;    */
  72
  73         //Position is x-end y-top of character position of the bullet.
  74         $frame->set_position($x, $y);
  75     }
  76 }