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:
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441 | $p = $frame->get_parent();
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442 | while ( $p ) {
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443 | $style = $p->get_style();
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444 | $max_y += $style->length_in_pt(array($style->margin_bottom,
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445 | $style->padding_bottom,
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446 | $style->border_bottom_width));
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447 | $p = $p->get_parent();
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448 | }
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449 |
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450 |
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451 | // Check if $frame flows off the page
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452 | if ( $max_y <= $this->_bottom_page_margin )
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453 | // no: do nothing
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454 | return false;
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455 |
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456 | dompdf_debug("page-break", "check_page_break");
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457 | dompdf_debug("page-break", "in_table: " . $this->_in_table);
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458 |
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459 |
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460 | // yes: determine page break location
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461 | $iter = $frame;
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462 | $flg = false;
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463 |
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464 | $in_table = $this->_in_table;
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465 |
|
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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 | ?> |
---|