[3019] | 1 | <?php
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| 2 | /**
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| 3 | * DOMPDF - PHP5 HTML to PDF renderer
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| 4 | *
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| 5 | * File: $RCSfile: page_frame_decorator.cls.php,v $
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| 6 | * Created on: 2004-06-15
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| 7 | *
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| 8 | * Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
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| 9 | *
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| 10 | * This library is free software; you can redistribute it and/or
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| 11 | * modify it under the terms of the GNU Lesser General Public
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| 12 | * License as published by the Free Software Foundation; either
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| 13 | * version 2.1 of the License, or (at your option) any later version.
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| 14 | *
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| 15 | * This library is distributed in the hope that it will be useful,
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 18 | * Lesser General Public License for more details.
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| 19 | *
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| 20 | * You should have received a copy of the GNU Lesser General Public License
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| 21 | * along with this library in the file LICENSE.LGPL; if not, write to the
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| 22 | * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 23 | * 02111-1307 USA
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| 24 | *
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| 25 | * Alternatively, you may distribute this software under the terms of the
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| 26 | * PHP License, version 3.0 or later. A copy of this license should have
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| 27 | * been distributed with this file in the file LICENSE.PHP . If this is not
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| 28 | * the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
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| 29 | *
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| 30 | * The latest version of DOMPDF might be available at:
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| 31 | * http://www.digitaljunkies.ca/dompdf
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| 32 | *
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| 33 | * @link http://www.digitaljunkies.ca/dompdf
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| 34 | * @copyright 2004 Benj Carson
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| 35 | * @author Benj Carson <benjcarson@digitaljunkies.ca>
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| 36 | * @package dompdf
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| 37 | * @version 0.5.1
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| 38 | */
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| 39 |
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| 40 | /* $Id: page_frame_decorator.cls.php 186 2009-10-19 22:42:06Z eclecticgeek@gmail.com $ */
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| 41 |
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| 42 | /**
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| 43 | * Decorates frames for page layout
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| 44 | *
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| 45 | * @access private
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| 46 | * @package dompdf
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| 47 | */
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| 48 | class Page_Frame_Decorator extends Frame_Decorator {
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| 49 |
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| 50 | /**
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| 51 | * y value of bottom page margin
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| 52 | *
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| 53 | * @var float
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| 54 | */
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| 55 | protected $_bottom_page_margin;
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| 56 |
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| 57 | /**
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| 58 | * Flag indicating page is full.
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| 59 | *
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| 60 | * @var bool
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| 61 | */
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| 62 | protected $_page_full;
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| 63 |
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| 64 | /**
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| 65 | * Number of tables currently being reflowed
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| 66 | *
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| 67 | * @var int
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| 68 | */
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| 69 | protected $_in_table;
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| 70 |
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| 71 | /**
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| 72 | * The pdf renderer
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| 73 | *
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| 74 | * @var Renderer
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| 75 | */
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| 76 | protected $_renderer;
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| 77 |
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| 78 | //........................................................................
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| 79 |
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| 80 | /**
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| 81 | * Class constructor
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| 82 | *
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| 83 | * @param Frame $frame the frame to decorate
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| 84 | */
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| 85 | function __construct(Frame $frame, DOMPDF $dompdf) {
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| 86 | parent::__construct($frame, $dompdf);
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| 87 | $this->_page_full = false;
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| 88 | $this->_in_table = 0;
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| 89 | $this->_bottom_page_margin = null;
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| 90 | }
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| 91 |
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| 92 |
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| 93 | /**
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| 94 | * Set the renderer used for this pdf
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| 95 | *
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| 96 | * @param Renderer $renderer the renderer to use
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| 97 | */
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| 98 | function set_renderer($renderer) {
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| 99 | $this->_renderer = $renderer;
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| 100 | }
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| 101 |
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| 102 | /**
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| 103 | * Return the renderer used for this pdf
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| 104 | *
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| 105 | * @return Renderer
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| 106 | */
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| 107 | function get_renderer() {
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| 108 | return $this->_renderer;
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| 109 | }
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| 110 |
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| 111 | /**
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| 112 | * Set the frame's containing block. Overridden to set $this->_bottom_page_margin.
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| 113 | *
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| 114 | * @param float $x
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| 115 | * @param float $y
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| 116 | * @param float $w
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| 117 | * @param float $h
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| 118 | */
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| 119 | function set_containing_block($x = null, $y = null, $w = null, $h = null) {
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| 120 | parent::set_containing_block($x,$y,$w,$h);
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| 121 | $w = $this->get_containing_block("w");
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| 122 | if ( isset($h) )
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| 123 | $this->_bottom_page_margin = $h; // - $this->_frame->get_style()->length_in_pt($this->_frame->get_style()->margin_bottom, $w);
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| 124 | }
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| 125 |
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| 126 | /**
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| 127 | * Returns true if the page is full and is no longer accepting frames.
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| 128 | *
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| 129 | * @return bool
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| 130 | */
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| 131 | function is_full() {
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| 132 | return $this->_page_full;
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| 133 | }
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| 134 |
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| 135 | /**
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| 136 | * Start a new page by resetting the full flag.
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| 137 | */
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| 138 | function next_page() {
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| 139 | $this->_renderer->new_page();
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| 140 | $this->_page_full = false;
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| 141 | }
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| 142 |
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| 143 | /**
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| 144 | * Indicate to the page that a table is currently being reflowed.
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| 145 | */
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| 146 | function table_reflow_start() {
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| 147 | $this->_in_table++;
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| 148 | }
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| 149 |
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| 150 | /**
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| 151 | * Indicate to the page that table reflow is finished.
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| 152 | */
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| 153 | function table_reflow_end() {
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| 154 | $this->_in_table--;
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| 155 | }
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| 156 |
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| 157 | /**
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| 158 | * Return whether we are currently in a nested table or not
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| 159 | *
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| 160 | * @return bool
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| 161 | */
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| 162 | function in_nested_table() {
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| 163 | return $this->_in_table > 1;
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| 164 | }
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| 165 |
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| 166 | /**
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| 167 | * Check if a forced page break is required before $frame. This uses the
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| 168 | * frame's page_break_before property as well as the preceeding frame's
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| 169 | * page_break_after property.
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| 170 | *
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| 171 | * @link http://www.w3.org/TR/CSS21/page.html#forced
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| 172 | *
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| 173 | * @param Frame $frame the frame to check
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| 174 | * @return bool true if a page break occured
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| 175 | */
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| 176 | function check_forced_page_break(Frame $frame) {
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| 177 |
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| 178 | // Skip check if page is already split
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| 179 | if ( $this->_page_full )
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| 180 | return;
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| 181 |
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| 182 | $block_types = array("block", "list-item", "table");
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| 183 | $page_breaks = array("always", "left", "right");
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| 184 |
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| 185 | $style = $frame->get_style();
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| 186 |
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| 187 | if ( !in_array($style->display, $block_types) )
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| 188 | return false;
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| 189 |
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| 190 | // Find the previous block-level sibling
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| 191 | $prev = $frame->get_prev_sibling();
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| 192 | while ( $prev && !in_array($prev->get_style()->display, $block_types) )
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| 193 | $prev = $prev->get_prev_sibling();
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| 194 |
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| 195 | if ( in_array($style->page_break_before, $page_breaks) ) {
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| 196 |
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| 197 | // Prevent cascading splits
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| 198 | $frame->split();
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| 199 | // We have to grab the style again here because split() resets
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| 200 | // $frame->style to the frame's orignal style.
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| 201 | $frame->get_style()->page_break_before = "auto";
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| 202 | $this->_page_full = true;
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| 203 | return true;
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| 204 | }
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| 205 |
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| 206 | if ( ($prev && in_array($prev->get_style()->page_break_after, $page_breaks)) ) {
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| 207 | // Prevent cascading splits
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| 208 | $frame->split();
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| 209 | $prev->get_style()->page_break_after = "auto";
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| 210 | $this->_page_full = true;
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| 211 | return true;
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| 212 | }
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| 213 |
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| 214 | return false;
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| 215 | }
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| 216 |
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| 217 | /**
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| 218 | * Determine if a page break is allowed before $frame
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| 219 | *
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| 220 | * @param Frame $frame the frame to check
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| 221 | * @return bool true if a break is allowed, false otherwise
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| 222 | */
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| 223 | protected function _page_break_allowed(Frame $frame) {
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| 224 | /**
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| 225 | *
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| 226 | * http://www.w3.org/TR/CSS21/page.html#allowed-page-breaks
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| 227 | * /*
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| 228 | * In the normal flow, page breaks can occur at the following places:
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| 229 | *
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| 230 | * 1. In the vertical margin between block boxes. When a page
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| 231 | * break occurs here, the used values of the relevant
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| 232 | * 'margin-top' and 'margin-bottom' properties are set to '0'.
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| 233 | * 2. Between line boxes inside a block box.
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| 234 | *
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| 235 | * These breaks are subject to the following rules:
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| 236 | *
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| 237 | * * Rule A: Breaking at (1) is allowed only if the
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| 238 | * 'page-break-after' and 'page-break-before' properties of
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| 239 | * all the elements generating boxes that meet at this margin
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| 240 | * allow it, which is when at least one of them has the value
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| 241 | * 'always', 'left', or 'right', or when all of them are
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| 242 | * 'auto'.
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| 243 | *
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| 244 | * * Rule B: However, if all of them are 'auto' and the
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| 245 | * nearest common ancestor of all the elements has a
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| 246 | * 'page-break-inside' value of 'avoid', then breaking here is
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| 247 | * not allowed.
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| 248 | *
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| 249 | * * Rule C: Breaking at (2) is allowed only if the number of
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| 250 | * line boxes between the break and the start of the enclosing
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| 251 | * block box is the value of 'orphans' or more, and the number
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| 252 | * of line boxes between the break and the end of the box is
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| 253 | * the value of 'widows' or more.
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| 254 | *
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| 255 | * * Rule D: In addition, breaking at (2) is allowed only if
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| 256 | * the 'page-break-inside' property is 'auto'.
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| 257 | *
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| 258 | * If the above doesn't provide enough break points to keep
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| 259 | * content from overflowing the page boxes, then rules B and D are
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| 260 | * dropped in order to find additional breakpoints.
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| 261 | *
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| 262 | * If that still does not lead to sufficient break points, rules A
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| 263 | * and C are dropped as well, to find still more break points.
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| 264 | *
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| 265 | * [endquote]
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| 266 | *
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| 267 | * We will also allow breaks between table rows. However, when
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| 268 | * splitting a table, the table headers should carry over to the
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| 269 | * next page (but they don't yet).
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| 270 | */
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| 271 |
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| 272 | $block_types = array("block", "list-item", "table");
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| 273 | dompdf_debug("page-break", "_page_break_allowed(" . $frame->get_node()->nodeName. ")");
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| 274 | $display = $frame->get_style()->display;
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| 275 |
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| 276 | // Block Frames (1):
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| 277 | if ( in_array($display, $block_types) ) {
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| 278 |
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| 279 | // Avoid breaks within table-cells
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| 280 | if ( $this->_in_table ) {
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| 281 | dompdf_debug("page-break", "In table: " . $this->_in_table);
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| 282 | return false;
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| 283 | }
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| 284 |
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| 285 | // Rules A & B
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| 286 |
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| 287 | if ( $frame->get_style()->page_break_before == "avoid" ) {
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| 288 | dompdf_debug("page-break", "before: avoid");
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| 289 | return false;
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| 290 | }
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| 291 |
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| 292 | // Find the preceeding block-level sibling
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| 293 | $prev = $frame->get_prev_sibling();
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| 294 | while ( $prev && !in_array($prev->get_style()->display, $block_types) )
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| 295 | $prev = $prev->get_prev_sibling();
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| 296 |
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| 297 | // Does the previous element allow a page break after?
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| 298 | if ( $prev && $prev->get_style()->page_break_after == "avoid" ) {
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| 299 | dompdf_debug("page-break", "after: avoid");
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| 300 | return false;
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| 301 | }
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| 302 |
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| 303 | // If both $prev & $frame have the same parent, check the parent's
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| 304 | // page_break_inside property.
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| 305 | $parent = $frame->get_parent();
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| 306 | if ( $prev && $parent && $parent->get_style()->page_break_inside == "avoid" ) {
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| 307 | dompdf_debug("page-break", "parent inside: avoid");
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| 308 | return false;
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| 309 | }
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| 310 |
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| 311 | // To prevent cascading page breaks when a top-level element has
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| 312 | // page-break-inside: avoid, ensure that at least one frame is
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| 313 | // on the page before splitting.
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| 314 | if ( $parent->get_node()->nodeName == "body" && !$prev ) {
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| 315 | // We are the body's first child
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| 316 | dompdf_debug("page-break", "Body's first child.");
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| 317 | return false;
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| 318 | }
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| 319 |
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| 320 | // If the frame is the first block-level frame, use the value from
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| 321 | // $frame's parent instead.
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| 322 | if ( !$prev && $parent )
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| 323 | return $this->_page_break_allowed( $parent );
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| 324 |
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| 325 | dompdf_debug("page-break", "block: break allowed");
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| 326 | return true;
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| 327 |
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| 328 | }
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| 329 |
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| 330 | // Inline frames (2):
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| 331 | else if ( in_array($display, Style::$INLINE_TYPES) ) {
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| 332 |
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| 333 | // Avoid breaks within table-cells
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| 334 | if ( $this->_in_table ) {
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| 335 | dompdf_debug("page-break", "In table: " . $this->_in_table);
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| 336 | return false;
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| 337 | }
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| 338 |
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| 339 | // Rule C
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| 340 | $block_parent = $frame->find_block_parent();
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| 341 | if ( count($block_parent->get_lines() ) < $frame->get_style()->orphans ) {
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| 342 | dompdf_debug("page-break", "orphans");
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| 343 | return false;
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| 344 | }
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| 345 |
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| 346 | // FIXME: Checking widows is tricky without having laid out the
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| 347 | // remaining line boxes. Just ignore it for now...
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| 348 |
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| 349 | // Rule D
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| 350 | $p = $block_parent;
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| 351 | while ($p) {
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| 352 | if ( $p->get_style()->page_break_inside == "avoid" ) {
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| 353 | dompdf_debug("page-break", "parent->inside: avoid");
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| 354 | return false;
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| 355 | }
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| 356 | $p = $p->find_block_parent();
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| 357 | }
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| 358 |
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| 359 | // To prevent cascading page breaks when a top-level element has
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| 360 | // page-break-inside: avoid, ensure that at least one frame with
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| 361 | // some content is on the page before splitting.
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| 362 | $prev = $frame->get_prev_sibling();
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| 363 | while ( $prev && ($prev->get_node()->nodeName == "#text" && trim($prev->get_node()->nodeValue) == "") )
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| 364 | $prev = $prev->get_prev_sibling();
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| 365 |
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| 366 | if ( $block_parent->get_node()->nodeName == "body" && !$prev ) {
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| 367 | // We are the body's first child
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| 368 | dompdf_debug("page-break", "Body's first child.");
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| 369 | return false;
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| 370 | }
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| 371 |
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| 372 | // Skip breaks on empty text nodes
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| 373 | if ( $frame->get_node()->nodeName == "#text" &&
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| 374 | $frame->get_node()->nodeValue == "" )
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| 375 | return false;
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| 376 |
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| 377 | dompdf_debug("page-break", "inline: break allowed");
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| 378 | return true;
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| 379 |
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| 380 | // Table-rows
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| 381 | } else if ( $display == "table-row" ) {
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| 382 |
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| 383 | // Simply check if the parent table's page_break_inside property is
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| 384 | // not 'avoid'
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| 385 | $p = Table_Frame_Decorator::find_parent_table($frame);
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| 386 |
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| 387 | while ($p) {
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| 388 | if ( $p->get_style()->page_break_inside == "avoid" ) {
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| 389 | dompdf_debug("page-break", "parent->inside: avoid");
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| 390 | return false;
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| 391 | }
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| 392 | $p = $p->find_block_parent();
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| 393 | }
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| 394 |
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| 395 | // Avoid breaking after the first row of a table
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| 396 | if ( $p && $p->get_first_child() === $frame) {
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| 397 | dompdf_debug("page-break", "table: first-row");
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| 398 | return false;
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| 399 | }
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| 400 |
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| 401 | // If this is a nested table, prevent the page from breaking
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| 402 | if ( $this->_in_table > 1 ) {
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| 403 | dompdf_debug("page-break", "table: nested table");
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| 404 | return false;
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| 405 | }
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| 406 |
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| 407 | dompdf_debug("page-break","table-row/row-groups: break allowed");
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| 408 | return true;
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| 409 |
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| 410 | } else if ( in_array($display, Table_Frame_Decorator::$ROW_GROUPS) ) {
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| 411 |
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| 412 | // Disallow breaks at row-groups: only split at row boundaries
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| 413 | return false;
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| 414 |
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| 415 | } else {
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| 416 |
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| 417 | dompdf_debug("page-break", "? " . $frame->get_style()->display . "");
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| 418 | return false;
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| 419 | }
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| 420 |
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| 421 | }
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| 422 |
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| 423 | /**
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| 424 | * Check if $frame will fit on the page. If the frame does not fit,
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| 425 | * the frame tree is modified so that a page break occurs in the
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| 426 | * correct location.
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| 427 | *
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| 428 | * @param Frame $frame the frame to check
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| 429 | * @return Frame the frame following the page break
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| 430 | */
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| 431 | function check_page_break(Frame $frame) {
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| 432 | // Do not split if we have already
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| 433 | if ( $this->_page_full )
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| 434 | return false;
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| 435 |
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| 436 | // Determine the frame's maximum y value
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| 437 | $max_y = $frame->get_position("y") + $frame->get_margin_height();
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| 438 |
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| 439 | // If a split is to occur here, then the bottom margins & paddings of all
|
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| 440 | // parents of $frame must fit on the page as well:
|
---|
| 441 | $p = $frame->get_parent();
|
---|
| 442 | while ( $p ) {
|
---|
| 443 | $style = $p->get_style();
|
---|
| 444 | $max_y += $style->length_in_pt(array($style->margin_bottom,
|
---|
| 445 | $style->padding_bottom,
|
---|
| 446 | $style->border_bottom_width));
|
---|
| 447 | $p = $p->get_parent();
|
---|
| 448 | }
|
---|
| 449 |
|
---|
| 450 |
|
---|
| 451 | // Check if $frame flows off the page
|
---|
| 452 | if ( $max_y <= $this->_bottom_page_margin )
|
---|
| 453 | // no: do nothing
|
---|
| 454 | return false;
|
---|
| 455 |
|
---|
| 456 | dompdf_debug("page-break", "check_page_break");
|
---|
| 457 | dompdf_debug("page-break", "in_table: " . $this->_in_table);
|
---|
| 458 |
|
---|
| 459 |
|
---|
| 460 | // yes: determine page break location
|
---|
| 461 | $iter = $frame;
|
---|
| 462 | $flg = false;
|
---|
| 463 |
|
---|
| 464 | $in_table = $this->_in_table;
|
---|
| 465 |
|
---|
| 466 | dompdf_debug("page-break","Starting search");
|
---|
| 467 | while ( $iter ) {
|
---|
| 468 | // echo "\nbacktrack: " .$iter->get_node()->nodeName ." ".spl_object_hash($iter->get_node()). "";
|
---|
| 469 | if ( $iter === $this ) {
|
---|
| 470 | dompdf_debug("page-break", "reached root.");
|
---|
| 471 | // We've reached the root in our search. Just split at $frame.
|
---|
| 472 | break;
|
---|
| 473 | }
|
---|
| 474 |
|
---|
| 475 | if ( $this->_page_break_allowed($iter) ) {
|
---|
| 476 | dompdf_debug("page-break","break allowed, splitting.");
|
---|
| 477 | $iter->split();
|
---|
| 478 | $this->_page_full = true;
|
---|
| 479 | $this->_in_table = $in_table;
|
---|
| 480 | return true;
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | if ( !$flg && $next = $iter->get_last_child() ) {
|
---|
| 484 | dompdf_debug("page-break", "following last child.");
|
---|
| 485 |
|
---|
| 486 | if ( in_array($next->get_style()->display, Style::$TABLE_TYPES) )
|
---|
| 487 | $this->_in_table++;
|
---|
| 488 |
|
---|
| 489 | $iter = $next;
|
---|
| 490 | continue;
|
---|
| 491 | }
|
---|
| 492 |
|
---|
| 493 | if ( $next = $iter->get_prev_sibling() ) {
|
---|
| 494 | dompdf_debug("page-break", "following prev sibling.");
|
---|
| 495 |
|
---|
| 496 | if ( in_array($next->get_style()->display, Style::$TABLE_TYPES) &&
|
---|
| 497 | !in_array($iter->get_style()->display, Style::$TABLE_TYPES) )
|
---|
| 498 | $this->_in_table++;
|
---|
| 499 |
|
---|
| 500 | else if ( !in_array($next->get_style()->display, Style::$TABLE_TYPES) &&
|
---|
| 501 | in_array($iter->get_style()->display, Style::$TABLE_TYPES) )
|
---|
| 502 | $this->_in_table--;
|
---|
| 503 |
|
---|
| 504 | $iter = $next;
|
---|
| 505 | $flg = false;
|
---|
| 506 | continue;
|
---|
| 507 | }
|
---|
| 508 |
|
---|
| 509 | if ( $next = $iter->get_parent() ) {
|
---|
| 510 | dompdf_debug("page-break", "following parent.");
|
---|
| 511 |
|
---|
| 512 | if ( in_array($iter->get_style()->display, Style::$TABLE_TYPES) )
|
---|
| 513 | $this->_in_table--;
|
---|
| 514 |
|
---|
| 515 | $iter = $next;
|
---|
| 516 | $flg = true;
|
---|
| 517 | continue;
|
---|
| 518 | }
|
---|
| 519 |
|
---|
| 520 | break;
|
---|
| 521 |
|
---|
| 522 | }
|
---|
| 523 |
|
---|
| 524 | $this->_in_table = $in_table;
|
---|
| 525 |
|
---|
| 526 | // No valid page break found. Just break at $frame.
|
---|
| 527 | dompdf_debug("page-break", "no valid break found, just splitting.");
|
---|
| 528 |
|
---|
| 529 | // If we are in a table, backtrack to the nearest top-level table row
|
---|
| 530 | if ( $this->_in_table ) {
|
---|
| 531 | $num_tables = $this->_in_table - 1;
|
---|
| 532 |
|
---|
| 533 | $iter = $frame;
|
---|
| 534 | while ( $iter && $num_tables && $iter->get_style->display != "table" ) {
|
---|
| 535 | $iter = $iter->get_parent();
|
---|
| 536 | $num_tables--;
|
---|
| 537 | }
|
---|
| 538 |
|
---|
| 539 | $iter = $frame;
|
---|
| 540 | while ($iter && $iter->get_style()->display != "table-row" )
|
---|
| 541 | $iter = $iter->get_parent();
|
---|
| 542 |
|
---|
| 543 | $iter->split();
|
---|
| 544 | $this->_page_full = true;
|
---|
| 545 | return true;
|
---|
| 546 | }
|
---|
| 547 |
|
---|
| 548 | $frame->split();
|
---|
| 549 | $this->_page_full = true;
|
---|
| 550 | return true;
|
---|
| 551 |
|
---|
| 552 | }
|
---|
| 553 |
|
---|
| 554 | //........................................................................
|
---|
| 555 |
|
---|
| 556 | function split($frame = null) {
|
---|
| 557 | // Do nothing
|
---|
| 558 | }
|
---|
| 559 |
|
---|
| 560 | }
|
---|
| 561 | ?> |
---|