<?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

 */



/**

 * Decorates frames for block layout

 *

 * @access private

 * @package dompdf

 */

class Block_Frame_Decorator extends Frame_Decorator {

  /**

   * Current line index

   *

   * @var int

   */

  protected $_cl;

  

  /**

   * The block's line boxes

   * 

   * @var Line_Box[]

   */

  protected $_line_boxes;



  function __construct(Frame $frame, DOMPDF $dompdf) {

    parent::__construct($frame, $dompdf);

    

    $this->_line_boxes = array(new Line_Box($this));

    $this->_cl = 0;

  }



  function reset() {

    parent::reset();

    

    $this->_line_boxes = array(new Line_Box($this));

    $this->_cl = 0;

  }



  /**

   * @return Line_Box

   */

  function get_current_line_box() {

    return $this->_line_boxes[$this->_cl];

  }



  /**

   * @return integer

   */

  function get_current_line_number() {

    return $this->_cl;

  }



  /**

   * @return Line_Box[]

   */

  function get_line_boxes() { 

    return $this->_line_boxes; 

  }



  /**

   * @param integer $i

   */

  function clear_line($i) {

    if ( isset($this->_line_boxes[$i]) ) {

      unset($this->_line_boxes[$i]);

    }

  }



  /**

   * @param Frame $frame

   */

  function add_frame_to_line(Frame $frame) {

    if ( !$frame->is_in_flow() ) {

      return;

    }

    

    $style = $frame->get_style();

    

    $frame->set_containing_line($this->_line_boxes[$this->_cl]);

    

    /*

    // Adds a new line after a block, only if certain conditions are met

    if ((($frame instanceof Inline_Frame_Decorator && $frame->get_node()->nodeName !== "br") || 

          $frame instanceof Text_Frame_Decorator && trim($frame->get_text())) && 

        ($frame->get_prev_sibling() && $frame->get_prev_sibling()->get_style()->display === "block" && 

         $this->_line_boxes[$this->_cl]->w > 0 )) {

           

           $this->maximize_line_height( $style->length_in_pt($style->line_height), $frame );

           $this->add_line();

         

           // Add each child of the inline frame to the line individually

           foreach ($frame->get_children() as $child)

             $this->add_frame_to_line( $child );     

    }

    else*/



    // Handle inline frames (which are effectively wrappers)

    if ( $frame instanceof Inline_Frame_Decorator ) {



      // Handle line breaks

      if ( $frame->get_node()->nodeName === "br" ) {

        $this->maximize_line_height( $style->length_in_pt($style->line_height), $frame );

        $this->add_line(true);

      }



      return;

    }



    // Trim leading text if this is an empty line.  Kinda a hack to put it here,

    // but what can you do...

    if ( $this->get_current_line_box()->w == 0 &&

         $frame->is_text_node() &&

        !$frame->is_pre() ) {



      $frame->set_text( ltrim($frame->get_text()) );

      $frame->recalculate_width();

    }



    $w = $frame->get_margin_width();



    if ( $w == 0 ) {

      return;

    }



    // Debugging code:

    /*

    pre_r("\n<h3>Adding frame to line:</h3>");



    //    pre_r("Me: " . $this->get_node()->nodeName . " (" . spl_object_hash($this->get_node()) . ")");

    //    pre_r("Node: " . $frame->get_node()->nodeName . " (" . spl_object_hash($frame->get_node()) . ")");

    if ( $frame->is_text_node() )

      pre_r('"'.$frame->get_node()->nodeValue.'"');



    pre_r("Line width: " . $this->_line_boxes[$this->_cl]->w);

    pre_r("Frame: " . get_class($frame));

    pre_r("Frame width: "  . $w);

    pre_r("Frame height: " . $frame->get_margin_height());

    pre_r("Containing block width: " . $this->get_containing_block("w"));

    */

    // End debugging



    $line = $this->_line_boxes[$this->_cl];

    if ( $line->left + $line->w + $line->right + $w > $this->get_containing_block("w")) {

      $this->add_line();

    }



    $frame->position();



    $current_line = $this->_line_boxes[$this->_cl];

    $current_line->add_frame($frame);



    if ( $frame->is_text_node() ) {

      $current_line->wc += count(preg_split("/\s+/", trim($frame->get_text())));

    }



    $this->increase_line_width($w);

    

    $this->maximize_line_height($frame->get_margin_height(), $frame);

  }



  function remove_frames_from_line(Frame $frame) {

    // Search backwards through the lines for $frame

    $i = $this->_cl;

    $j = null;



    while ($i >= 0) {

      if ( ($j = in_array($frame, $this->_line_boxes[$i]->get_frames(), true)) !== false ) {

        break;

      }

      

      $i--;

    }



    if ( $j === false ) {

      return;

    }



    // Remove $frame and all frames that follow

    while ($j < count($this->_line_boxes[$i]->get_frames())) {

      $frames = $this->_line_boxes[$i]->get_frames();

      $f = $frames[$j];

      $frames[$j] = null;

      unset($frames[$j]);

      $j++;

      $this->_line_boxes[$i]->w -= $f->get_margin_width();

    }



    // Recalculate the height of the line

    $h = 0;

    foreach ($this->_line_boxes[$i]->get_frames() as $f) {

      $h = max( $h, $f->get_margin_height() );

    }



    $this->_line_boxes[$i]->h = $h;



    // Remove all lines that follow

    while ($this->_cl > $i) {

      $this->_line_boxes[ $this->_cl ] = null;

      unset($this->_line_boxes[ $this->_cl ]);

      $this->_cl--;

    }

  }



  function increase_line_width($w) {

    $this->_line_boxes[ $this->_cl ]->w += $w;

  }



  function maximize_line_height($val, Frame $frame) {

    if ( $val > $this->_line_boxes[ $this->_cl ]->h ) {

      $this->_line_boxes[ $this->_cl ]->tallest_frame = $frame;

      $this->_line_boxes[ $this->_cl ]->h = $val;

    }

  }



  function add_line($br = false) {



//     if ( $this->_line_boxes[$this->_cl]["h"] == 0 ) //count($this->_line_boxes[$i]["frames"]) == 0 ||

//       return;



    $this->_line_boxes[$this->_cl]->br = $br;

    $y = $this->_line_boxes[$this->_cl]->y + $this->_line_boxes[$this->_cl]->h;



    $new_line = new Line_Box($this, $y);

    

    $this->_line_boxes[ ++$this->_cl ] = $new_line;

  }



  //........................................................................

}