1 | <?php |
---|
2 | /** |
---|
3 | * DOMPDF - PHP5 HTML to PDF renderer |
---|
4 | * |
---|
5 | * File: $RCSfile: frame_reflower.cls.php,v $ |
---|
6 | * Created on: 2004-06-17 |
---|
7 | * |
---|
8 | * Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca> |
---|
9 | * |
---|
10 | * This library is free software; you can redistribute it and/or |
---|
11 | * modify it under the terms of the GNU Lesser General Public |
---|
12 | * License as published by the Free Software Foundation; either |
---|
13 | * version 2.1 of the License, or (at your option) any later version. |
---|
14 | * |
---|
15 | * This library is distributed in the hope that it will be useful, |
---|
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
18 | * Lesser General Public License for more details. |
---|
19 | * |
---|
20 | * You should have received a copy of the GNU Lesser General Public License |
---|
21 | * along with this library in the file LICENSE.LGPL; if not, write to the |
---|
22 | * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
---|
23 | * 02111-1307 USA |
---|
24 | * |
---|
25 | * Alternatively, you may distribute this software under the terms of the |
---|
26 | * PHP License, version 3.0 or later. A copy of this license should have |
---|
27 | * been distributed with this file in the file LICENSE.PHP . If this is not |
---|
28 | * the case, you can obtain a copy at http://www.php.net/license/3_0.txt. |
---|
29 | * |
---|
30 | * The latest version of DOMPDF might be available at: |
---|
31 | * http://www.digitaljunkies.ca/dompdf |
---|
32 | * |
---|
33 | * @link http://www.digitaljunkies.ca/dompdf |
---|
34 | * @copyright 2004 Benj Carson |
---|
35 | * @author Benj Carson <benjcarson@digitaljunkies.ca> |
---|
36 | * @package dompdf |
---|
37 | * @version 0.5.1 |
---|
38 | */ |
---|
39 | |
---|
40 | /* $Id: frame_reflower.cls.php 186 2009-10-19 22:42:06Z eclecticgeek@gmail.com $ */ |
---|
41 | |
---|
42 | /** |
---|
43 | * Base reflower class |
---|
44 | * |
---|
45 | * Reflower objects are responsible for determining the width and height of |
---|
46 | * individual frames. They also create line and page breaks as necessary. |
---|
47 | * |
---|
48 | * @access private |
---|
49 | * @package dompdf |
---|
50 | */ |
---|
51 | abstract class Frame_Reflower { |
---|
52 | |
---|
53 | /** |
---|
54 | * Frame for this reflower |
---|
55 | * |
---|
56 | * @var Frame |
---|
57 | */ |
---|
58 | protected $_frame; |
---|
59 | |
---|
60 | /** |
---|
61 | * Cached min/max size |
---|
62 | * |
---|
63 | * @var array |
---|
64 | */ |
---|
65 | protected $_min_max_cache; |
---|
66 | |
---|
67 | function __construct(Frame $frame) { |
---|
68 | $this->_frame = $frame; |
---|
69 | $this->_min_max_cache = null; |
---|
70 | } |
---|
71 | |
---|
72 | function dispose() { |
---|
73 | unset($this->_frame); |
---|
74 | } |
---|
75 | |
---|
76 | protected function _collapse_margins() { |
---|
77 | $cb = $this->_frame->get_containing_block(); |
---|
78 | $style = $this->_frame->get_style(); |
---|
79 | |
---|
80 | $t = $style->length_in_pt($style->margin_top, $cb["h"]); |
---|
81 | $b = $style->length_in_pt($style->margin_bottom, $cb["w"]); |
---|
82 | |
---|
83 | // Handle 'auto' values |
---|
84 | if ( $t === "auto" ) { |
---|
85 | $style->margin_top = "0pt"; |
---|
86 | $t = 0; |
---|
87 | } |
---|
88 | |
---|
89 | if ( $b === "auto" ) { |
---|
90 | $style->margin_bottom = "0pt"; |
---|
91 | $b = 0; |
---|
92 | } |
---|
93 | |
---|
94 | // Collapse vertical margins: |
---|
95 | $n = $this->_frame->get_next_sibling(); |
---|
96 | while ( $n && !in_array($n->get_style()->display, Style::$BLOCK_TYPES) ) |
---|
97 | $n = $n->get_next_sibling(); |
---|
98 | |
---|
99 | if ( $n ) { // && !$n instanceof Page_Frame_Decorator ) { |
---|
100 | |
---|
101 | $b = max($b, $style->length_in_pt($n->get_style()->margin_top, $cb["w"])); |
---|
102 | |
---|
103 | $n->get_style()->margin_top = "$b pt"; |
---|
104 | $style->margin_bottom = "0 pt"; |
---|
105 | |
---|
106 | } |
---|
107 | |
---|
108 | // Collapse our first child's margin |
---|
109 | $f = $this->_frame->get_first_child(); |
---|
110 | while ( $f && !in_array($f->get_style()->display, Style::$BLOCK_TYPES) ) |
---|
111 | $f = $f->get_next_sibling(); |
---|
112 | |
---|
113 | if ( $f ) { |
---|
114 | $t = max( $t, $style->length_in_pt($f->get_style()->margin_top, $cb["w"])); |
---|
115 | $style->margin_top = "$t pt"; |
---|
116 | $f->get_style()->margin_top = "0 pt"; |
---|
117 | } |
---|
118 | |
---|
119 | } |
---|
120 | |
---|
121 | // Returns true if a new page is required |
---|
122 | protected function _check_new_page() { |
---|
123 | $y = $this->_frame->get_position("y"); |
---|
124 | $h = $style->length_in_pt($style->height); |
---|
125 | // Check if we need to move to a new page |
---|
126 | if ( $y + $h >= $this->_frame->get_root()->get_page_height() ) |
---|
127 | return true; |
---|
128 | |
---|
129 | } |
---|
130 | |
---|
131 | //........................................................................ |
---|
132 | |
---|
133 | abstract function reflow(); |
---|
134 | |
---|
135 | //........................................................................ |
---|
136 | |
---|
137 | // Required for table layout: Returns an array(0 => min, 1 => max, "min" |
---|
138 | // => min, "max" => max) of the minimum and maximum widths of this frame. |
---|
139 | // This provides a basic implementation. Child classes should override |
---|
140 | // this if necessary. |
---|
141 | function get_min_max_width() { |
---|
142 | if ( !is_null($this->_min_max_cache) ) { |
---|
143 | return $this->_min_max_cache; |
---|
144 | } |
---|
145 | |
---|
146 | $style = $this->_frame->get_style(); |
---|
147 | |
---|
148 | // Account for margins & padding |
---|
149 | $dims = array($style->padding_left, |
---|
150 | $style->padding_right, |
---|
151 | $style->border_left_width, |
---|
152 | $style->border_right_width, |
---|
153 | $style->margin_left, |
---|
154 | $style->margin_right); |
---|
155 | |
---|
156 | $cb_w = $this->_frame->get_containing_block("w"); |
---|
157 | $delta = $style->length_in_pt($dims, $cb_w); |
---|
158 | |
---|
159 | // Handle degenerate case |
---|
160 | if ( !$this->_frame->get_first_child() ) |
---|
161 | return $this->_min_max_cache = array($delta, $delta,"min" => $delta, "max" => $delta); |
---|
162 | |
---|
163 | $low = array(); |
---|
164 | $high = array(); |
---|
165 | |
---|
166 | for ( $iter = $this->_frame->get_children()->getIterator(); |
---|
167 | $iter->valid(); |
---|
168 | $iter->next() ) { |
---|
169 | |
---|
170 | $inline_min = 0; |
---|
171 | $inline_max = 0; |
---|
172 | |
---|
173 | // Add all adjacent inline widths together to calculate max width |
---|
174 | while ( $iter->valid() && in_array( $iter->current()->get_style()->display, Style::$INLINE_TYPES ) ) { |
---|
175 | |
---|
176 | $child = $iter->current(); |
---|
177 | |
---|
178 | $minmax = $child->get_min_max_width(); |
---|
179 | |
---|
180 | if ( in_array( $iter->current()->get_style()->white_space, array("pre", "nowrap") ) ) |
---|
181 | $inline_min += $minmax["min"]; |
---|
182 | else |
---|
183 | $low[] = $minmax["min"]; |
---|
184 | |
---|
185 | $inline_max += $minmax["max"]; |
---|
186 | $iter->next(); |
---|
187 | |
---|
188 | } |
---|
189 | |
---|
190 | if ( $inline_max > 0 ) |
---|
191 | $high[] = $inline_max; |
---|
192 | |
---|
193 | if ( $inline_min > 0 ) |
---|
194 | $low[] = $inline_min; |
---|
195 | |
---|
196 | if ( $iter->valid() ) { |
---|
197 | list($low[], $high[]) = $iter->current()->get_min_max_width(); |
---|
198 | continue; |
---|
199 | } |
---|
200 | |
---|
201 | } |
---|
202 | $min = count($low) ? max($low) : 0; |
---|
203 | $max = count($high) ? max($high) : 0; |
---|
204 | |
---|
205 | // Use specified width if it is greater than the minimum defined by the |
---|
206 | // content. If the width is a percentage ignore it for now. |
---|
207 | $width = $style->width; |
---|
208 | if ( $width !== "auto" && !is_percent($width) ) { |
---|
209 | $width = $style->length_in_pt($width, $cb_w); |
---|
210 | if ( $min < $width ) |
---|
211 | $min = $width; |
---|
212 | if ( $max < $width ) |
---|
213 | $max = $width; |
---|
214 | } |
---|
215 | |
---|
216 | $min += $delta; |
---|
217 | $max += $delta; |
---|
218 | return $this->_min_max_cache = array($min, $max, "min"=>$min, "max"=>$max); |
---|
219 | } |
---|
220 | |
---|
221 | } |
---|
222 | |
---|
223 | ?> |
---|