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<?php /** * @package dompdf * @link https://github.com/dompdf/dompdf * @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 PageFrameDecorator $frame * @param int $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); } $frame->calculate_bottom_page_edge(); } /* * Paged layout: * http://www.w3.org/TR/CSS21/page.html * * @param BlockFrameDecorator\|null $block / function reflow(BlockFrameDecorator $block = null) { /* @var PageFrameDecorator $frame / $frame = $this->_frame; $child = $frame->get_first_child(); $fixed_children = []; $prev_child = null; $current_page = 0; while ($child) { $this->apply_page_style($frame, $current_page + 1); $style = $frame->get_style(); // Pages are only concerned with margins $cb = $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) { foreach ($child->get_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 $frame->get_renderer()->render($child); // Check for end render callback $this->_check_callbacks("end_page_render", $child); if ($next_child) { $frame->next_page(); } // Wait to dispose of all frames on the previous page // so callback will have access to them if ($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(string $event, Frame $frame): void { if (!isset($this->_callbacks)) { $dompdf = $this->get_dompdf(); $this->_callbacks = $dompdf->getCallbacks(); $this->_canvas = $dompdf->getCanvas(); } if (isset($this->_callbacks[$event])) { $fs = $this->_callbacks[$event]; $canvas = $this->_canvas; $fontMetrics = $this->get_dompdf()->getFontMetrics(); foreach ($fs as $f) { $f($frame, $canvas, $fontMetrics); } } } }

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