mail-boxes-etc / lib / dompdf / src / FrameReflower / Page.php

Page.php in MBE eShip trunk, at lib/dompdf/src/FrameReflower/Page.php

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1	<?php
2	/**
3	* @package dompdf
4	* @link https://github.com/dompdf/dompdf
5	* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
6	*/
7	namespace Dompdf\FrameReflower;
8
9	use Dompdf\Frame;
10	use Dompdf\FrameDecorator\Block as BlockFrameDecorator;
11	use Dompdf\FrameDecorator\Page as PageFrameDecorator;
12
13	/**
14	* Reflows pages
15	*
16	* @package dompdf
17	*/
18	class Page extends AbstractFrameReflower
19	{
20
21	/**
22	* Cache of the callbacks array
23	*
24	* @var array
25	*/
26	private $_callbacks;
27
28	/**
29	* Cache of the canvas
30	*
31	* @var \Dompdf\Canvas
32	*/
33	private $_canvas;
34
35	/**
36	* Page constructor.
37	* @param PageFrameDecorator $frame
38	*/
39	function __construct(PageFrameDecorator $frame)
40	{
41	parent::__construct($frame);
42	}
43
44	/**
45	* @param PageFrameDecorator $frame
46	* @param int $page_number
47	*/
48	function apply_page_style(Frame $frame, $page_number)
49	{
50	$style = $frame->get_style();
51	$page_styles = $style->get_stylesheet()->get_page_styles();
52
53	// http://www.w3.org/TR/CSS21/page.html#page-selectors
54	if (count($page_styles) > 1) {
55	$odd = $page_number % 2 == 1;
56	$first = $page_number == 1;
57
58	$style = clone $page_styles["base"];
59
60	// FIXME RTL
61	if ($odd && isset($page_styles[":right"])) {
62	$style->merge($page_styles[":right"]);
63	}
64
65	if ($odd && isset($page_styles[":odd"])) {
66	$style->merge($page_styles[":odd"]);
67	}
68
69	// FIXME RTL
70	if (!$odd && isset($page_styles[":left"])) {
71	$style->merge($page_styles[":left"]);
72	}
73
74	if (!$odd && isset($page_styles[":even"])) {
75	$style->merge($page_styles[":even"]);
76	}
77
78	if ($first && isset($page_styles[":first"])) {
79	$style->merge($page_styles[":first"]);
80	}
81
82	$frame->set_style($style);
83	}
84
85	$frame->calculate_bottom_page_edge();
86	}
87
88	/**
89	* Paged layout:
90	* http://www.w3.org/TR/CSS21/page.html
91	*
92	* @param BlockFrameDecorator\|null $block
93	*/
94	function reflow(BlockFrameDecorator $block = null)
95	{
96	/** @var PageFrameDecorator $frame */
97	$frame = $this->_frame;
98	$child = $frame->get_first_child();
99	$fixed_children = [];
100	$prev_child = null;
101	$current_page = 0;
102
103	while ($child) {
104	$this->apply_page_style($frame, $current_page + 1);
105
106	$style = $frame->get_style();
107
108	// Pages are only concerned with margins
109	$cb = $frame->get_containing_block();
110	$left = (float)$style->length_in_pt($style->margin_left, $cb["w"]);
111	$right = (float)$style->length_in_pt($style->margin_right, $cb["w"]);
112	$top = (float)$style->length_in_pt($style->margin_top, $cb["h"]);
113	$bottom = (float)$style->length_in_pt($style->margin_bottom, $cb["h"]);
114
115	$content_x = $cb["x"] + $left;
116	$content_y = $cb["y"] + $top;
117	$content_width = $cb["w"] - $left - $right;
118	$content_height = $cb["h"] - $top - $bottom;
119
120	// Only if it's the first page, we save the nodes with a fixed position
121	if ($current_page == 0) {
122	foreach ($child->get_children() as $onechild) {
123	if ($onechild->get_style()->position === "fixed") {
124	$fixed_children[] = $onechild->deep_copy();
125	}
126	}
127	$fixed_children = array_reverse($fixed_children);
128	}
129
130	$child->set_containing_block($content_x, $content_y, $content_width, $content_height);
131
132	// Check for begin reflow callback
133	$this->_check_callbacks("begin_page_reflow", $child);
134
135	//Insert a copy of each node which have a fixed position
136	if ($current_page >= 1) {
137	foreach ($fixed_children as $fixed_child) {
138	$child->insert_child_before($fixed_child->deep_copy(), $child->get_first_child());
139	}
140	}
141
142	$child->reflow();
143	$next_child = $child->get_next_sibling();
144
145	// Check for begin render callback
146	$this->_check_callbacks("begin_page_render", $child);
147
148	// Render the page
149	$frame->get_renderer()->render($child);
150
151	// Check for end render callback
152	$this->_check_callbacks("end_page_render", $child);
153
154	if ($next_child) {
155	$frame->next_page();
156	}
157
158	// Wait to dispose of all frames on the previous page
159	// so callback will have access to them
160	if ($prev_child) {
161	$prev_child->dispose(true);
162	}
163	$prev_child = $child;
164	$child = $next_child;
165	$current_page++;
166	}
167
168	// Dispose of previous page if it still exists
169	if ($prev_child) {
170	$prev_child->dispose(true);
171	}
172	}
173
174	/**
175	* Check for callbacks that need to be performed when a given event
176	* gets triggered on a page
177	*
178	* @param string $event The type of event
179	* @param Frame $frame The frame that event is triggered on
180	*/
181	protected function _check_callbacks(string $event, Frame $frame): void
182	{
183	if (!isset($this->_callbacks)) {
184	$dompdf = $this->get_dompdf();
185	$this->_callbacks = $dompdf->getCallbacks();
186	$this->_canvas = $dompdf->getCanvas();
187	}
188
189	if (isset($this->_callbacks[$event])) {
190	$fs = $this->_callbacks[$event];
191	$canvas = $this->_canvas;
192	$fontMetrics = $this->get_dompdf()->getFontMetrics();
193
194	foreach ($fs as $f) {
195	$f($frame, $canvas, $fontMetrics);
196	}
197	}
198	}
199	}
200