<?php
  /**
   * @package dompdf
   * @link    http://dompdf.github.com/
   * @author  Benj Carson <benjcarson@digitaljunkies.ca>
   * @author  Brian Sweeney <eclecticgeek@gmail.com>
   * @author  Fabien Ménager <fabien.menager@gmail.com>
   * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
   */
  namespace Dompdf\FrameDecorator;
  
  use Dompdf\Dompdf;
  use Dompdf\Frame;
  use Dompdf\Exception;
  use DOMText;
  use Dompdf\FontMetrics;
  
  /**
   * Decorates Frame objects for text layout
   *
   * @access  private
   * @package dompdf
   */
  class Text extends AbstractFrameDecorator
  {
  
      // protected members
      protected $_text_spacing;
  
      function __construct(Frame $frame, Dompdf $dompdf)
      {
          if (!$frame->is_text_node()) {
              throw new Exception("Text_Decorator can only be applied to #text nodes.");
          }
  
          parent::__construct($frame, $dompdf);
          $this->_text_spacing = null;
      }
  
      //........................................................................
  
      function reset()
      {
          parent::reset();
          $this->_text_spacing = null;
      }
  
      //........................................................................
  
      // Accessor methods
      function get_text_spacing()
      {
          return $this->_text_spacing;
      }
  
      function get_text()
      {
          // FIXME: this should be in a child class (and is incorrect)
  //    if ( $this->_frame->get_style()->content !== "normal" ) {
  //      $this->_frame->get_node()->data = $this->_frame->get_style()->content;
  //      $this->_frame->get_style()->content = "normal";
  //    }
  
  //      Helpers::pre_r("---");
  //      $style = $this->_frame->get_style();
  //      var_dump($text = $this->_frame->get_node()->data);
  //      var_dump($asc = utf8_decode($text));
  //      for ($i = 0; $i < strlen($asc); $i++)
  //        Helpers::pre_r("$i: " . $asc[$i] . " - " . ord($asc[$i]));
  //      Helpers::pre_r("width: " . $this->_dompdf->getFontMetrics()->getTextWidth($text, $style->font_family, $style->font_size));
  
          return $this->_frame->get_node()->data;
      }
  
      //........................................................................
  
      // Vertical margins & padding do not apply to text frames
  
      // http://www.w3.org/TR/CSS21/visudet.html#inline-non-replaced:
      //
      // The vertical padding, border and margin of an inline, non-replaced box
      // start at the top and bottom of the content area, not the
      // 'line-height'. But only the 'line-height' is used to calculate the
      // height of the line box.
      function get_margin_height()
      {
          // This function is called in add_frame_to_line() and is used to
          // determine the line height, so we actually want to return the
          // 'line-height' property, not the actual margin box
          $style = $this->get_parent()->get_style();
          $font = $style->font_family;
          $size = $style->font_size;
  
          /*
          Helpers::pre_r('-----');
          Helpers::pre_r($style->line_height);
          Helpers::pre_r($style->font_size);
          Helpers::pre_r($this->_dompdf->getFontMetrics()->getFontHeight($font, $size));
          Helpers::pre_r(($style->line_height / $size) * $this->_dompdf->getFontMetrics()->getFontHeight($font, $size));
          */
  
          return ($style->line_height / ($size > 0 ? $size : 1)) * $this->_dompdf->getFontMetrics()->getFontHeight($font, $size);
  
      }
  
      function get_padding_box()
      {
          $pb = $this->_frame->get_padding_box();
          $pb[3] = $pb["h"] = $this->_frame->get_style()->height;
  
          return $pb;
      }
      //........................................................................
  
      // Set method
      function set_text_spacing($spacing)
      {
          $style = $this->_frame->get_style();
  
          $this->_text_spacing = $spacing;
          $char_spacing = $style->length_in_pt($style->letter_spacing);
  
          // Re-adjust our width to account for the change in spacing
          $style->width = $this->_dompdf->getFontMetrics()->getTextWidth($this->get_text(), $style->font_family, $style->font_size, $spacing, $char_spacing);
      }
  
      //........................................................................
  
      // Recalculate the text width
      function recalculate_width()
      {
          $style = $this->get_style();
          $text = $this->get_text();
          $size = $style->font_size;
          $font = $style->font_family;
          $word_spacing = $style->length_in_pt($style->word_spacing);
          $char_spacing = $style->length_in_pt($style->letter_spacing);
  
          return $style->width = $this->_dompdf->getFontMetrics()->getTextWidth($text, $font, $size, $word_spacing, $char_spacing);
      }
  
      //........................................................................
  
      // Text manipulation methods
  
      // split the text in this frame at the offset specified.  The remaining
      // text is added a sibling frame following this one and is returned.
      function split_text($offset)
      {
          if ($offset == 0) {
              return null;
          }
  
          $split = $this->_frame->get_node()->splitText($offset);
  
          $deco = $this->copy($split);
  
          $p = $this->get_parent();
          $p->insert_child_after($deco, $this, false);
  
          if ($p instanceof Inline) {
              $p->split($deco);
          }
  
          return $deco;
      }
  
      //........................................................................
  
      function delete_text($offset, $count)
      {
          $this->_frame->get_node()->deleteData($offset, $count);
      }
  
      //........................................................................
  
      function set_text($text)
      {
          $this->_frame->get_node()->data = $text;
      }
  
  }