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sources/3rdparty/dompdf/include/absolute_positioner.cls.php 3.14 KB
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  <?php
  /**
   * @package dompdf
   * @link    http://www.dompdf.com/
   * @author  Benj Carson <benjcarson@digitaljunkies.ca>
   * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
   * @version $Id: absolute_positioner.cls.php 460 2012-01-26 07:17:46Z fabien.menager $
   */
  
  /**
   * Positions absolutely positioned frames
   */
  class Absolute_Positioner extends Positioner {
  
    function __construct(Frame_Decorator $frame) { parent::__construct($frame); }
  
    function position() {
  
      $frame = $this->_frame;
      $style = $frame->get_style();
      
      $p = $frame->find_positionned_parent();
      
      list($x, $y, $w, $h) = $frame->get_containing_block();
  
      $top    = $style->length_in_pt($style->top,    $h);
      $right  = $style->length_in_pt($style->right,  $w);
      $bottom = $style->length_in_pt($style->bottom, $h);
      $left   = $style->length_in_pt($style->left,   $w);
      
      if ( $p && !($left === "auto" && $right === "auto") ) {
        // Get the parent's padding box (see http://www.w3.org/TR/CSS21/visuren.html#propdef-top)
        list($x, $y, $w, $h) = $p->get_padding_box();
      }
      
      list($width, $height) = array($frame->get_margin_width(), $frame->get_margin_height());
      
      $orig_style = $this->_frame->get_original_style();
      $orig_width = $orig_style->width;
      $orig_height = $orig_style->height;
      
      /****************************
      
      Width auto: 
      ____________| left=auto | left=fixed |
      right=auto  |     A     |     B      |
      right=fixed |     C     |     D      |
      
      Width fixed: 
      ____________| left=auto | left=fixed |
      right=auto  |     E     |     F      |
      right=fixed |     G     |     H      |
      
      *****************************/
      
      if ( $left === "auto" ) {
        if ( $right === "auto" ) {
          // A or E - Keep the frame at the same position
        }
        else {
          if ( $orig_width === "auto" ) {
            // C
            $x += $w - $width - $right;
          }
          else {
            // G
            $x += $w - $width - $right;
          }
        }
      }
      else {
        if ( $right === "auto" ) {
          // B or F
          $x += $left;
        }
        else {
          if ( $orig_width === "auto" ) {
            // D - TODO change width
            $x += $left;
          }
          else {
            // H - Everything is fixed: left + width win
            $x += $left;
          }
        }
      }
      
      // The same vertically
      if ( $top === "auto" ) {
        if ( $bottom === "auto" ) {
          // A or E - Keep the frame at the same position
          $y = $frame->get_parent()->get_current_line_box()->y;
        }
        else {
          if ( $orig_height === "auto" ) {
            // C
            $y += $h - $height - $bottom;
          }
          else {
            // G
            $y += $h - $height - $bottom;
          }
        }
      }
      else {
        if ( $bottom === "auto" ) {
          // B or F
          $y += $top;
        }
        else {
          if ( $orig_height === "auto" ) {
            // D - TODO change height
            $y += $top;
          }
          else {
            // H - Everything is fixed: top + height win
            $y += $top;
          }
        }
      }
      
      $frame->set_position($x, $y);
  
    }
  }