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Filename : LineBox.php
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<?php
/**
 * @package dompdf
 * @link    http://dompdf.github.com/
 * @author  Fabien Ménager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */
namespace Dompdf;

use Dompdf\FrameDecorator\Block;
use Dompdf\FrameDecorator\Page;

/**
 * The line box class
 *
 * This class represents a line box
 * http://www.w3.org/TR/CSS2/visuren.html#line-box
 *
 * @package dompdf
 */
class LineBox
{

    /**
     * @var Block
     */
    protected $_block_frame;

    /**
     * @var Frame[]
     */
    protected $_frames = [];

    /**
     * @var integer
     */
    public $wc = 0;

    /**
     * @var float
     */
    public $y = null;

    /**
     * @var float
     */
    public $w = 0.0;

    /**
     * @var float
     */
    public $h = 0.0;

    /**
     * @var float
     */
    public $left = 0.0;

    /**
     * @var float
     */
    public $right = 0.0;

    /**
     * @var Frame
     */
    public $tallest_frame = null;

    /**
     * @var bool[]
     */
    public $floating_blocks = [];

    /**
     * @var bool
     */
    public $br = false;

    /**
     * Class constructor
     *
     * @param Block $frame the Block containing this line
     * @param int $y
     */
    public function __construct(Block $frame, $y = 0)
    {
        $this->_block_frame = $frame;
        $this->_frames = [];
        $this->y = $y;

        $this->get_float_offsets();
    }

    /**
     * Returns the floating elements inside the first floating parent
     *
     * @param Page $root
     *
     * @return Frame[]
     */
    public function get_floats_inside(Page $root)
    {
        $floating_frames = $root->get_floating_frames();

        if (count($floating_frames) == 0) {
            return $floating_frames;
        }

        // Find nearest floating element
        $p = $this->_block_frame;
        while ($p->get_style()->float === "none") {
            $parent = $p->get_parent();

            if (!$parent) {
                break;
            }

            $p = $parent;
        }

        if ($p == $root) {
            return $floating_frames;
        }

        $parent = $p;

        $childs = [];

        foreach ($floating_frames as $_floating) {
            $p = $_floating->get_parent();

            while (($p = $p->get_parent()) && $p !== $parent);

            if ($p) {
                $childs[] = $p;
            }
        }

        return $childs;
    }

    /**
     *
     */
    public function get_float_offsets()
    {
        static $anti_infinite_loop = 10000; // FIXME smelly hack

        $reflower = $this->_block_frame->get_reflower();

        if (!$reflower) {
            return;
        }

        $cb_w = null;

        $block = $this->_block_frame;
        $root = $block->get_root();

        if (!$root) {
            return;
        }

        $style = $this->_block_frame->get_style();
        $floating_frames = $this->get_floats_inside($root);
        $inside_left_floating_width = 0;
        $inside_right_floating_width = 0;
        $outside_left_floating_width = 0;
        $outside_right_floating_width = 0;

        foreach ($floating_frames as $child_key => $floating_frame) {
            $floating_frame_parent = $floating_frame->get_parent();
            $id = $floating_frame->get_id();

            if (isset($this->floating_blocks[$id])) {
                continue;
            }

            $float = $floating_frame->get_style()->float;
            $floating_width = $floating_frame->get_margin_width();

            if (!$cb_w) {
                $cb_w = $floating_frame->get_containing_block("w");
            }

            $line_w = $this->get_width();

            if (!$floating_frame->_float_next_line && ($cb_w <= $line_w + $floating_width) && ($cb_w > $line_w)) {
                $floating_frame->_float_next_line = true;
                continue;
            }

            // If the child is still shifted by the floating element
            if ($anti_infinite_loop-- > 0 &&
                $floating_frame->get_position("y") + $floating_frame->get_margin_height() >= $this->y &&
                $block->get_position("x") + $block->get_margin_width() >= $floating_frame->get_position("x")
            ) {
                if ($float === "left") {
                    if ($floating_frame_parent === $this->_block_frame) {
                        $inside_left_floating_width += $floating_width;
                    } else {
                        $outside_left_floating_width += $floating_width;
                    }
                } elseif ($float === "right") {
                    if ($floating_frame_parent === $this->_block_frame) {
                        $inside_right_floating_width += $floating_width;
                    } else {
                        $outside_right_floating_width += $floating_width;
                    }
                }

                $this->floating_blocks[$id] = true;
            } // else, the floating element won't shift anymore
            else {
                $root->remove_floating_frame($child_key);
            }
        }

        $this->left += $inside_left_floating_width;
        if ($outside_left_floating_width > 0 && $outside_left_floating_width > ((float)$style->length_in_pt($style->margin_left) + (float)$style->length_in_pt($style->padding_left))) {
            $this->left += $outside_left_floating_width - (float)$style->length_in_pt($style->margin_left) - (float)$style->length_in_pt($style->padding_left);
        }
        $this->right += $inside_right_floating_width;
        if ($outside_right_floating_width > 0 && $outside_right_floating_width > ((float)$style->length_in_pt($style->margin_left) + (float)$style->length_in_pt($style->padding_right))) {
            $this->right += $outside_right_floating_width - (float)$style->length_in_pt($style->margin_right) - (float)$style->length_in_pt($style->padding_right);
        }
    }

    /**
     * @return float
     */
    public function get_width()
    {
        return $this->left + $this->w + $this->right;
    }

    /**
     * @return Block
     */
    public function get_block_frame()
    {
        return $this->_block_frame;
    }

    /**
     * @return Frame[]
     */
    function &get_frames()
    {
        return $this->_frames;
    }

    /**
     * @param Frame $frame
     */
    public function add_frame(Frame $frame)
    {
        $this->_frames[] = $frame;
    }

    /**
     * Recalculate LineBox width based on the contained frames total width.
     *
     * @return float
     */
    public function recalculate_width()
    {
        $width = 0;

        foreach ($this->get_frames() as $frame) {
            $width += $frame->calculate_auto_width();
        }

        return $this->w = $width;
    }

    /**
     * @return string
     */
    public function __toString()
    {
        $props = ["wc", "y", "w", "h", "left", "right", "br"];
        $s = "";
        foreach ($props as $prop) {
            $s .= "$prop: " . $this->$prop . "\n";
        }
        $s .= count($this->_frames) . " frames\n";

        return $s;
    }
    /*function __get($prop) {
      if (!isset($this->{"_$prop"})) return;
      return $this->{"_$prop"};
    }*/
}

/*
class LineBoxList implements Iterator {
  private $_p = 0;
  private $_lines = array();

}
*/