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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\Frame;
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 = array();
/**
* @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 = array();
/**
* @var bool
*/
public $br = false;
/**
* Class constructor
*
* @param Block $frame the Block containing this line
*/
function __construct(Block $frame, $y = 0)
{
$this->_block_frame = $frame;
$this->_frames = array();
$this->y = $y;
$this->get_float_offsets();
}
/**
* Returns the floating elements inside the first floating parent
*
* @param Page $root
*
* @return Frame[]
*/
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;
$childs = array();
foreach ($floating_frames as $_floating) {
$p = $_floating->get_parent();
while (($p = $p->get_parent()) && $p !== $parent) ;
if ($p) {
$childs[] = $p;
}
}
return $childs;
}
function get_float_offsets()
{
static $anti_infinite_loop = 500; // 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;
}
$floating_frames = $this->get_floats_inside($root);
foreach ($floating_frames as $child_key => $floating_frame) {
$id = $floating_frame->get_id();
if (isset($this->floating_blocks[$id])) {
continue;
}
$floating_style = $floating_frame->get_style();
$float = $floating_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") {
$this->left += $floating_width;
} else {
$this->right += $floating_width;
}
$this->floating_blocks[$id] = true;
} // else, the floating element won't shift anymore
else {
$root->remove_floating_frame($child_key);
}
}
}
/**
* @return float
*/
function get_width()
{
return $this->left + $this->w + $this->right;
}
/**
* @return Block
*/
function get_block_frame()
{
return $this->_block_frame;
}
/**
* @return Frame[]
*/
function &get_frames()
{
return $this->_frames;
}
/**
* @param Frame $frame
*/
function add_frame(Frame $frame)
{
$this->_frames[] = $frame;
}
function __toString()
{
$props = array("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();
}
*/
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