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<?php
/**
* @package dompdf
* @link http://dompdf.github.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @author Fabien Ménager <fabien.menager@gmail.com>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace Dompdf\FrameReflower;
use Dompdf\Frame;
use Dompdf\FrameDecorator\Block as BlockFrameDecorator;
use Dompdf\FrameDecorator\Page as PageFrameDecorator;
/**
* Reflows pages
*
* @package dompdf
*/
class Page extends AbstractFrameReflower
{
/**
* Cache of the callbacks array
*
* @var array
*/
private $_callbacks;
/**
* Cache of the canvas
*
* @var \Dompdf\Canvas
*/
private $_canvas;
/**
* Page constructor.
* @param PageFrameDecorator $frame
*/
function __construct(PageFrameDecorator $frame)
{
parent::__construct($frame);
}
/**
* @param Frame $frame
* @param $page_number
*/
function apply_page_style(Frame $frame, $page_number)
{
$style = $frame->get_style();
$page_styles = $style->get_stylesheet()->get_page_styles();
// http://www.w3.org/TR/CSS21/page.html#page-selectors
if (count($page_styles) > 1) {
$odd = $page_number % 2 == 1;
$first = $page_number == 1;
$style = clone $page_styles["base"];
// FIXME RTL
if ($odd && isset($page_styles[":right"])) {
$style->merge($page_styles[":right"]);
}
if ($odd && isset($page_styles[":odd"])) {
$style->merge($page_styles[":odd"]);
}
// FIXME RTL
if (!$odd && isset($page_styles[":left"])) {
$style->merge($page_styles[":left"]);
}
if (!$odd && isset($page_styles[":even"])) {
$style->merge($page_styles[":even"]);
}
if ($first && isset($page_styles[":first"])) {
$style->merge($page_styles[":first"]);
}
$frame->set_style($style);
}
}
/**
* Paged layout:
* http://www.w3.org/TR/CSS21/page.html
*
* @param BlockFrameDecorator|null $block
*/
function reflow(BlockFrameDecorator $block = null)
{
$fixed_children = array();
$prev_child = null;
$child = $this->_frame->get_first_child();
$current_page = 0;
while ($child) {
$this->apply_page_style($this->_frame, $current_page + 1);
$style = $this->_frame->get_style();
// Pages are only concerned with margins
$cb = $this->_frame->get_containing_block();
$left = (float)$style->length_in_pt($style->margin_left, $cb["w"]);
$right = (float)$style->length_in_pt($style->margin_right, $cb["w"]);
$top = (float)$style->length_in_pt($style->margin_top, $cb["h"]);
$bottom = (float)$style->length_in_pt($style->margin_bottom, $cb["h"]);
$content_x = $cb["x"] + $left;
$content_y = $cb["y"] + $top;
$content_width = $cb["w"] - $left - $right;
$content_height = $cb["h"] - $top - $bottom;
// Only if it's the first page, we save the nodes with a fixed position
if ($current_page == 0) {
$children = $child->get_children();
foreach ($children as $onechild) {
if ($onechild->get_style()->position === "fixed") {
$fixed_children[] = $onechild->deep_copy();
}
}
$fixed_children = array_reverse($fixed_children);
}
$child->set_containing_block($content_x, $content_y, $content_width, $content_height);
// Check for begin reflow callback
$this->_check_callbacks("begin_page_reflow", $child);
//Insert a copy of each node which have a fixed position
if ($current_page >= 1) {
foreach ($fixed_children as $fixed_child) {
$child->insert_child_before($fixed_child->deep_copy(), $child->get_first_child());
}
}
$child->reflow();
$next_child = $child->get_next_sibling();
// Check for begin render callback
$this->_check_callbacks("begin_page_render", $child);
// Render the page
$this->_frame->get_renderer()->render($child);
// Check for end render callback
$this->_check_callbacks("end_page_render", $child);
if ($next_child) {
$this->_frame->next_page();
}
// Wait to dispose of all frames on the previous page
// so callback will have access to them
if ($prev_child) {
$prev_child->dispose(true);
}
$prev_child = $child;
$child = $next_child;
$current_page++;
}
// Dispose of previous page if it still exists
if ($prev_child) {
$prev_child->dispose(true);
}
}
/**
* Check for callbacks that need to be performed when a given event
* gets triggered on a page
*
* @param string $event the type of event
* @param Frame $frame the frame that event is triggered on
*/
protected function _check_callbacks($event, $frame)
{
if (!isset($this->_callbacks)) {
$dompdf = $this->_frame->get_dompdf();
$this->_callbacks = $dompdf->get_callbacks();
$this->_canvas = $dompdf->get_canvas();
}
if (is_array($this->_callbacks) && isset($this->_callbacks[$event])) {
$info = array(
0 => $this->_canvas, "canvas" => $this->_canvas,
1 => $frame, "frame" => $frame,
);
$fs = $this->_callbacks[$event];
foreach ($fs as $f) {
if (is_callable($f)) {
if (is_array($f)) {
$f[0]->{$f[1]}($info);
} else {
$f($info);
}
}
}
}
}
}
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