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