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: frame.cls.php,v $ |
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6 | * Created on: 2004-06-02 |
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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: frame.cls.php,v 1.11 2006/07/07 21:31:03 benjcarson Exp $ */ |
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41 | |
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42 | /** |
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43 | * The main Frame class |
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44 | * |
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45 | * This class represents a single HTML element. This class stores |
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46 | * positioning information as well as containing block location and |
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47 | * dimensions. Style information for the element is stored in a {@link |
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48 | * Style} object. Tree structure is maintained via the parent & children |
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49 | * links. |
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50 | * |
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51 | * @access protected |
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52 | * @package dompdf |
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53 | */ |
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54 | class Frame { |
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55 | |
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56 | /** |
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57 | * The DOMNode object this frame represents |
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58 | * |
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59 | * @var DOMNode |
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60 | */ |
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61 | protected $_node; |
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62 | |
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63 | /** |
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64 | * Unique identifier for this frame. Used to reference this frame |
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65 | * via the node. |
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66 | * |
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67 | * @var string |
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68 | */ |
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69 | protected $_id; |
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70 | |
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71 | /** |
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72 | * This frame's calculated style |
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73 | * |
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74 | * @var Style |
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75 | */ |
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76 | protected $_style; |
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77 | |
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78 | /** |
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79 | * This frame's original style. Needed for cases where frames are |
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80 | * split across pages. |
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81 | * |
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82 | * @var Style |
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83 | */ |
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84 | protected $_original_style; |
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85 | |
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86 | /** |
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87 | * This frame's parent in the document tree. |
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88 | * |
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89 | * @var Frame |
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90 | */ |
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91 | protected $_parent; |
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92 | |
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93 | /** |
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94 | * This frame's first child. All children are handled as a |
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95 | * doubly-linked list. |
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96 | * |
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97 | * @var Frame |
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98 | */ |
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99 | protected $_first_child; |
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100 | |
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101 | /** |
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102 | * This frame's last child. |
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103 | * |
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104 | * @var Frame |
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105 | */ |
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106 | protected $_last_child; |
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107 | |
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108 | /** |
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109 | * This frame's previous sibling in the document tree. |
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110 | * |
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111 | * @var Frame |
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112 | */ |
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113 | protected $_prev_sibling; |
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114 | |
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115 | /** |
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116 | * This frame's next sibling in the document tree. |
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117 | * |
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118 | * @var Frame |
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119 | */ |
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120 | protected $_next_sibling; |
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121 | |
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122 | /** |
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123 | * This frame's containing block (used in layout): array(x, y, w, h) |
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124 | * |
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125 | * @var array |
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126 | */ |
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127 | protected $_containing_block; |
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128 | |
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129 | /** |
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130 | * Position on the page of the top-left corner of the margin box of |
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131 | * this frame: array(x,y) |
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132 | * |
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133 | * @var array |
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134 | */ |
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135 | protected $_position; |
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136 | |
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137 | /** |
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138 | * This frame's decorator |
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139 | * |
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140 | * @var Frame_Decorator |
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141 | */ |
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142 | protected $_decorator; |
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143 | |
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144 | /** |
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145 | * Class constructor |
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146 | * |
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147 | * @param DOMNode $node the DOMNode this frame represents |
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148 | */ |
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149 | function __construct(DomNode $node) { |
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150 | $this->_node = $node; |
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151 | |
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152 | $this->_parent = null; |
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153 | $this->_first_child = null; |
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154 | $this->_last_child = null; |
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155 | $this->_prev_sibling = $this->_next_sibling = null; |
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156 | |
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157 | $this->_style = null; |
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158 | $this->_original_style = null; |
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159 | |
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160 | $this->_containing_block = array("x" => null, |
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161 | "y" => null, |
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162 | "w" => null, |
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163 | "h" => null); |
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164 | $this->_position = array("x" => null, |
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165 | "y" => null); |
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166 | |
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167 | $this->_decorator = null; |
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168 | |
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169 | $this->set_id( uniqid(rand()) ); |
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170 | } |
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171 | |
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172 | /** |
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173 | * "Destructor": forcibly free all references held by this frame |
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174 | * |
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175 | * @param bool $recursive if true, call dispose on all children |
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176 | */ |
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177 | function dispose($recursive = false) { |
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178 | |
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179 | if ( $recursive ) { |
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180 | while ( $child = $this->_first_child ) |
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181 | $child->dispose(true); |
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182 | } |
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183 | |
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184 | // Remove this frame from the tree |
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185 | if ( $this->_prev_sibling ) { |
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186 | $this->_prev_sibling->_next_sibling = $this->_next_sibling; |
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187 | } |
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188 | |
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189 | if ( $this->_next_sibling ) { |
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190 | $this->_next_sibling->_prev_sibling = $this->_prev_sibling; |
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191 | } |
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192 | |
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193 | if ( $this->_parent && $this->_parent->_first_child === $this ) { |
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194 | $this->_parent->_first_child = $this->_next_sibling; |
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195 | } |
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196 | |
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197 | if ( $this->_parent && $this->_parent->_last_child === $this ) { |
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198 | $this->_parent->_last_child = $this->_prev_sibling; |
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199 | } |
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200 | |
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201 | if ( $this->_parent ) { |
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202 | $this->_parent->get_node()->removeChild($this->_node); |
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203 | } |
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204 | |
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205 | $this->_style->dispose(); |
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206 | unset($this->_style); |
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207 | $this->_original_style->dispose(); |
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208 | unset($this->_original_style); |
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209 | |
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210 | } |
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211 | |
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212 | // Re-initialize the frame |
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213 | function reset() { |
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214 | $this->_position = array("x" => null, |
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215 | "y" => null); |
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216 | $this->_containing_block = array("x" => null, |
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217 | "y" => null, |
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218 | "w" => null, |
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219 | "h" => null); |
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220 | |
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221 | unset($this->_style); |
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222 | $this->_style = clone $this->_original_style; |
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223 | |
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224 | } |
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225 | |
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226 | //........................................................................ |
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227 | |
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228 | // Accessor methods |
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229 | function get_node() { return $this->_node; } |
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230 | function get_id() { return $this->_id; } |
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231 | function get_style() { return $this->_style; } |
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232 | function get_original_style() { return $this->_original_style; } |
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233 | function get_parent() { return $this->_parent; } |
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234 | function get_decorator() { return $this->_decorator; } |
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235 | function get_first_child() { return $this->_first_child; } |
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236 | function get_last_child() { return $this->_last_child; } |
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237 | function get_prev_sibling() { return $this->_prev_sibling; } |
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238 | function get_next_sibling() { return $this->_next_sibling; } |
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239 | |
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240 | function get_children() { return new FrameList($this); } |
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241 | |
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242 | // Layout property accessors |
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243 | function get_containing_block($i = null) { |
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244 | if ( isset($i) ) |
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245 | return $this->_containing_block[$i]; |
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246 | return $this->_containing_block; |
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247 | } |
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248 | |
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249 | function get_position($i = null) { |
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250 | if ( isset($i) ) |
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251 | return $this->_position[$i]; |
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252 | return array($this->_position["x"], |
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253 | $this->_position["y"], |
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254 | "x"=>$this->_position["x"], |
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255 | "y"=>$this->_position["y"]); |
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256 | } |
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257 | |
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258 | //........................................................................ |
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259 | |
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260 | // Return the height of the margin box of the frame, in pt. Meaningless |
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261 | // unless the height has been calculated properly. |
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262 | function get_margin_height() { |
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263 | return $this->_style->length_in_pt(array($this->_style->height, |
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264 | $this->_style->margin_top, |
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265 | $this->_style->margin_bottom, |
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266 | $this->_style->border_top_width, |
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267 | $this->_style->border_bottom_width, |
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268 | $this->_style->padding_top, |
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269 | $this->_style->padding_bottom), |
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270 | $this->_containing_block["w"]); |
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271 | } |
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272 | |
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273 | // Return the width of the margin box of the frame, in pt. Meaningless |
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274 | // unless the width has been calculted properly. |
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275 | function get_margin_width() { |
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276 | return $this->_style->length_in_pt(array($this->_style->width, |
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277 | $this->_style->margin_left, |
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278 | $this->_style->margin_right, |
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279 | $this->_style->border_left_width, |
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280 | $this->_style->border_right_width, |
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281 | $this->_style->padding_left, |
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282 | $this->_style->padding_right), |
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283 | $this->_containing_block["w"]); |
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284 | } |
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285 | |
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286 | // Return the padding box (x,y,w,h) of the frame |
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287 | function get_padding_box() { |
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288 | $x = $this->_position["x"] + |
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289 | $this->_style->length_in_pt(array($this->_style->margin_left, |
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290 | $this->_style->border_left_width), |
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291 | $this->_containing_block["w"]); |
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292 | $y = $this->_position["y"] + |
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293 | $this->_style->length_in_pt(array($this->_style->margin_top, |
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294 | $this->_style->border_top_width), |
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295 | $this->_containing_block["w"]); |
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296 | |
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297 | $w = $this->_style->length_in_pt(array($this->_style->padding_left, |
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298 | $this->_style->width, |
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299 | $this->_style->padding_right), |
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300 | $this->_containing_block["w"]); |
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301 | |
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302 | $h = $this->_style->length_in_pt(array($this->_style->padding_top, |
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303 | $this->_style->height, |
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304 | $this->_style->padding_bottom), |
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305 | $this->_containing_block["w"]); |
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306 | |
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307 | return array(0 => $x, "x" => $x, |
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308 | 1 => $y, "y" => $y, |
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309 | 2 => $w, "w" => $w, |
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310 | 3 => $h, "h" => $h); |
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311 | } |
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312 | |
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313 | // Return the border box of the frame |
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314 | function get_border_box() { |
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315 | $x = $this->_position["x"] + |
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316 | $this->_style->length_in_pt($this->_style->margin_left, |
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317 | $this->_containing_block["w"]); |
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318 | $y = $this->_position["y"] + |
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319 | $this->_style->length_in_pt($this->_style->margin_top, |
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320 | $this->_containing_block["w"]); |
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321 | |
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322 | $w = $this->_style->length_in_pt(array($this->_style->border_left_width, |
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323 | $this->_style->padding_left, |
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324 | $this->_style->width, |
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325 | $this->_style->padding_right, |
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326 | $this->_style->border_right_width), |
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327 | $this->_containing_block["w"]); |
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328 | |
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329 | $h = $this->_style->length_in_pt(array($this->_style->border_top_width, |
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330 | $this->_style->padding_top, |
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331 | $this->_style->height, |
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332 | $this->_style->padding_bottom, |
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333 | $this->_style->border_bottom_width), |
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334 | $this->_containing_block["w"]); |
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335 | |
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336 | return array(0 => $x, "x" => $x, |
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337 | 1 => $y, "y" => $y, |
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338 | 2 => $w, "w" => $w, |
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339 | 3 => $h, "h" => $h); |
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340 | |
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341 | } |
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342 | |
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343 | //........................................................................ |
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344 | |
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345 | // Set methods |
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346 | function set_id($id) { |
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347 | $this->_id = $id; |
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348 | |
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349 | // We can only set attributes of DOMElement objects (nodeType == 1). |
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350 | // Since these are the only objects that we can assign CSS rules to, |
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351 | // this shortcoming is okay. |
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352 | if ( $this->_node->nodeType == 1) |
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353 | $this->_node->setAttribute("frame_id", $id); |
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354 | } |
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355 | |
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356 | function set_style(Style $style) { |
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357 | if ( is_null($this->_style) ) |
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358 | $this->_original_style = clone $style; |
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359 | |
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360 | $this->_style = $style; |
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361 | } |
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362 | |
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363 | function set_decorator(Frame_Decorator $decorator) { |
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364 | $this->_decorator = $decorator; |
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365 | } |
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366 | |
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367 | function set_containing_block($x = null, $y = null, $w = null, $h = null) { |
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368 | if ( is_array($x) ) |
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369 | extract($x); |
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370 | |
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371 | if (is_numeric($x)) { |
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372 | $this->_containing_block[0] = $x; |
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373 | $this->_containing_block["x"] = $x; |
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374 | } |
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375 | |
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376 | if (is_numeric($y)) { |
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377 | $this->_containing_block[1] = $y; |
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378 | $this->_containing_block["y"] = $y; |
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379 | } |
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380 | |
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381 | if (is_numeric($w)) { |
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382 | $this->_containing_block[2] = $w; |
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383 | $this->_containing_block["w"] = $w; |
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384 | } |
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385 | |
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386 | if (is_numeric($h)) { |
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387 | $this->_containing_block[3] = $h; |
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388 | $this->_containing_block["h"] = $h; |
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389 | } |
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390 | |
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391 | } |
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392 | |
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393 | function set_position($x = null, $y = null) { |
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394 | if ( is_array($x) ) |
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395 | extract($x); |
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396 | |
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397 | if ( is_numeric($x) ) { |
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398 | $this->_position[0] = $x; |
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399 | $this->_position["x"] = $x; |
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400 | } |
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401 | |
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402 | if ( is_numeric($y) ) { |
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403 | $this->_position[1] = $y; |
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404 | $this->_position["y"] = $y; |
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405 | } |
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406 | } |
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407 | |
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408 | //........................................................................ |
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409 | |
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410 | function prepend_child(Frame $child, $update_node = true) { |
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411 | |
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412 | if ( $update_node ) |
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413 | $this->_node->insertBefore($child->_node, $this->_first_child ? $this->_first_child->_node : null); |
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414 | |
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415 | // Remove the child from its parent |
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416 | if ( $child->_parent ) |
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417 | $child->_parent->remove_child($child, false); |
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418 | |
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419 | $child->_parent = $this; |
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420 | $child->_prev_sibling = null; |
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421 | |
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422 | // Handle the first child |
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423 | if ( !$this->_first_child ) { |
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424 | $this->_first_child = $child; |
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425 | $this->_last_child = $child; |
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426 | $child->_next_sibling = null; |
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427 | |
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428 | } else { |
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429 | |
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430 | $this->_first_child->_prev_sibling = $child; |
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431 | $child->_next_sibling = $this->_first_child; |
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432 | $this->_first_child = $child; |
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433 | |
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434 | } |
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435 | } |
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436 | |
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437 | function append_child(Frame $child, $update_node = true) { |
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438 | |
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439 | if ( $update_node ) |
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440 | $this->_node->appendChild($child->_node); |
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441 | |
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442 | // Remove the child from its parent |
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443 | if ( $child->_parent ) |
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444 | $child->_parent->remove_child($child, false); |
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445 | |
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446 | $child->_parent = $this; |
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447 | $child->_next_sibling = null; |
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448 | |
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449 | // Handle the first child |
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450 | if ( !$this->_last_child ) { |
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451 | $this->_first_child = $child; |
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452 | $this->_last_child = $child; |
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453 | $child->_prev_sibling = null; |
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454 | |
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455 | } else { |
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456 | |
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457 | $this->_last_child->_next_sibling = $child; |
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458 | $child->_prev_sibling = $this->_last_child; |
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459 | $this->_last_child = $child; |
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460 | |
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461 | } |
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462 | } |
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463 | |
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464 | // Inserts a new child immediately before the specified frame |
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465 | function insert_child_before(Frame $new_child, Frame $ref, $update_node = true) { |
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466 | |
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467 | if ( $ref === $this->_first_child ) { |
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468 | $this->prepend_child($new_child, $update_node); |
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469 | return; |
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470 | } |
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471 | |
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472 | if ( is_null($ref) ) { |
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473 | $this->append_child($new_child, $update_node); |
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474 | return; |
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475 | } |
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476 | |
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477 | if ( $ref->_parent !== $this ) |
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478 | throw new DOMPDF_Exception("Reference child is not a child of this node."); |
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479 | |
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480 | // Update the node |
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481 | if ( $update_node ) |
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482 | $this->_node->insertBefore($new_child->_node, $ref->_node); |
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483 | |
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484 | // Remove the child from its parent |
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485 | if ( $new_child->_parent ) |
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486 | $new_child->_parent->remove_child($new_child, false); |
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487 | |
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488 | $new_child->_parent = $this; |
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489 | $new_child->_next_sibling = $ref; |
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490 | $new_child->_prev_sibling = $ref->_prev_sibling; |
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491 | |
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492 | if ( $ref->_prev_sibling ) |
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493 | $ref->_prev_sibling->_next_sibling = $new_child; |
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494 | |
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495 | $ref->_prev_sibling = $new_child; |
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496 | } |
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497 | |
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498 | // Inserts a new child immediately after the specified frame |
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499 | function insert_child_after(Frame $new_child, Frame $ref, $update_node = true) { |
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500 | |
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501 | if ( $ref === $this->_last_child ) { |
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502 | $this->append_child($new_child, $update_node); |
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503 | return; |
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504 | } |
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505 | |
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506 | if ( is_null($ref) ) { |
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507 | $this->prepend_child($new_child, $update_node); |
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508 | return; |
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509 | } |
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510 | |
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511 | if ( $ref->_parent !== $this ) |
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512 | throw new DOMPDF_Exception("Reference child is not a child of this node."); |
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513 | |
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514 | // Update the node |
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515 | if ( $update_node ) { |
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516 | if ( $ref->_next_sibling ) { |
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517 | $next_node = $ref->_next_sibling->_node; |
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518 | $this->_node->insertBefore($new_child->_node, $next_node); |
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519 | } else { |
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520 | $new_child->_node = $this->_node->appendChild($new_child); |
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521 | } |
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522 | } |
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523 | |
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524 | // Remove the child from its parent |
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525 | if ( $new_child->_parent) |
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526 | $new_child->_parent->remove_child($new_child, false); |
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527 | |
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528 | $new_child->_parent = $this; |
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529 | $new_child->_prev_sibling = $ref; |
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530 | $new_child->_next_sibling = $ref->_next_sibling; |
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531 | |
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532 | if ( $ref->_next_sibling ) |
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533 | $ref->_next_sibling->_prev_sibling = $new_child; |
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534 | |
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535 | $ref->_next_sibling = $new_child; |
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536 | } |
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537 | |
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538 | |
---|
539 | function remove_child(Frame $child, $update_node = true) { |
---|
540 | |
---|
541 | if ( $child->_parent !== $this ) |
---|
542 | throw new DOMPDF_Exception("Child not found in this frame"); |
---|
543 | |
---|
544 | if ( $update_node ) |
---|
545 | $this->_node->removeChild($child->_node); |
---|
546 | |
---|
547 | if ( $child === $this->_first_child ) |
---|
548 | $this->_first_child = $child->_next_sibling; |
---|
549 | |
---|
550 | if ( $child === $this->_last_child ) |
---|
551 | $this->_last_child = $child->_prev_sibling; |
---|
552 | |
---|
553 | if ( $child->_prev_sibling ) |
---|
554 | $child->_prev_sibling->_next_sibling = $child->_next_sibling; |
---|
555 | |
---|
556 | if ( $child->_next_sibling ) |
---|
557 | $child->_next_sibling->_prev_sibling = $child->_prev_sibling; |
---|
558 | |
---|
559 | $child->_next_sibling = null; |
---|
560 | $child->_prev_sibling = null; |
---|
561 | $child->_parent = null; |
---|
562 | return $child; |
---|
563 | |
---|
564 | } |
---|
565 | |
---|
566 | //........................................................................ |
---|
567 | |
---|
568 | // Debugging function: |
---|
569 | function __toString() { |
---|
570 | |
---|
571 | // Skip empty text frames |
---|
572 | if ( $this->_node->nodeName == "#text" && |
---|
573 | preg_replace("/\s/", "", $this->_node->data) === "" ) |
---|
574 | return ""; |
---|
575 | |
---|
576 | |
---|
577 | $str = "<b>" . $this->_node->nodeName . ":</b><br/>"; |
---|
578 | $str .= (string)$this->_node . "<br/>"; |
---|
579 | $str .= "Id: " .$this->get_id() . "<br/>"; |
---|
580 | $str .= "Class: " .get_class($this) . "<br/>"; |
---|
581 | |
---|
582 | if ( $this->_node->nodeName == "#text" ) { |
---|
583 | $tmp = htmlspecialchars($this->_node->nodeValue); |
---|
584 | $str .= "<pre>'" . mb_substr($tmp,0,70) . |
---|
585 | (mb_strlen($tmp) > 70 ? "..." : "") . "'</pre>"; |
---|
586 | } |
---|
587 | if ( $this->_parent ) |
---|
588 | $str .= "\nParent:" . $this->_parent->_node->nodeName . |
---|
589 | " (" . (string)$this->_parent->_node . ") " . |
---|
590 | "<br/>"; |
---|
591 | |
---|
592 | if ( $this->_prev_sibling ) |
---|
593 | $str .= "Prev: " . $this->_prev_sibling->_node->nodeName . |
---|
594 | " (" . (string)$this->_prev_sibling->_node . ") " . |
---|
595 | "<br/>"; |
---|
596 | |
---|
597 | if ( $this->_next_sibling ) |
---|
598 | $str .= "Next: " . $this->_next_sibling->_node->nodeName . |
---|
599 | " (" . (string)$this->_next_sibling->_node . ") " . |
---|
600 | "<br/>"; |
---|
601 | |
---|
602 | $d = $this->get_decorator(); |
---|
603 | while ($d && $d != $d->get_decorator()) { |
---|
604 | $str .= "Decorator: " . get_class($d) . "<br/>"; |
---|
605 | $d = $d->get_decorator(); |
---|
606 | } |
---|
607 | |
---|
608 | $str .= "Position: " . pre_r($this->_position, true); |
---|
609 | $str .= "\nContaining block: " . pre_r($this->_containing_block, true); |
---|
610 | $str .= "\nMargin width: " . pre_r($this->get_margin_width(), true); |
---|
611 | $str .= "\nMargin height: " . pre_r($this->get_margin_height(), true); |
---|
612 | |
---|
613 | $str .= "\nStyle: <pre>". $this->_style->__toString() . "</pre>"; |
---|
614 | |
---|
615 | if ( $this->_decorator instanceof Block_Frame_Decorator ) { |
---|
616 | $str .= "Lines:<pre>"; |
---|
617 | foreach ($this->_decorator->get_lines() as $line) { |
---|
618 | foreach ($line["frames"] as $frame) { |
---|
619 | if ($frame instanceof Text_Frame_Decorator) { |
---|
620 | $str .= "\ntext: "; |
---|
621 | $str .= htmlspecialchars($frame->get_text()); |
---|
622 | } else { |
---|
623 | $str .= "\nBlock: " . $frame->get_node()->nodeName . " (" . (string)$frame->get_node() . ")"; |
---|
624 | } |
---|
625 | } |
---|
626 | |
---|
627 | $str .= |
---|
628 | //"\ncount => " . $line["count"] . "\n". |
---|
629 | "\ny => " . $line["y"] . "\n" . |
---|
630 | "w => " . $line["w"] . "\n" . |
---|
631 | "h => " . $line["h"] . "\n"; |
---|
632 | } |
---|
633 | $str .= "</pre>"; |
---|
634 | } |
---|
635 | $str .= "\n"; |
---|
636 | if ( php_sapi_name() == "cli" ) |
---|
637 | $str = strip_tags(str_replace(array("<br/>","<b>","</b>"), |
---|
638 | array("\n","",""), |
---|
639 | $str)); |
---|
640 | |
---|
641 | return $str; |
---|
642 | } |
---|
643 | |
---|
644 | } |
---|
645 | |
---|
646 | //------------------------------------------------------------------------ |
---|
647 | |
---|
648 | /** |
---|
649 | * Linked-list IteratorAggregate |
---|
650 | * |
---|
651 | * @access private |
---|
652 | * @package dompdf |
---|
653 | */ |
---|
654 | class FrameList implements IteratorAggregate { |
---|
655 | protected $_frame; |
---|
656 | |
---|
657 | function __construct($frame) { $this->_frame = $frame; } |
---|
658 | function getIterator() { return new FrameListIterator($this->_frame); } |
---|
659 | } |
---|
660 | |
---|
661 | /** |
---|
662 | * Linked-list Iterator |
---|
663 | * |
---|
664 | * Returns children in order and allows for list to change during iteration, |
---|
665 | * provided the changes occur to or after the current element |
---|
666 | * |
---|
667 | * @access private |
---|
668 | * @package dompdf |
---|
669 | */ |
---|
670 | class FrameListIterator implements Iterator { |
---|
671 | |
---|
672 | protected $_parent; |
---|
673 | protected $_cur; |
---|
674 | protected $_num; |
---|
675 | |
---|
676 | function __construct(Frame $frame) { |
---|
677 | $this->_parent = $frame; |
---|
678 | $this->_cur = $frame->get_first_child(); |
---|
679 | $this->_num = 0; |
---|
680 | } |
---|
681 | |
---|
682 | function rewind() { |
---|
683 | $this->_cur = $this->_parent->get_first_child(); |
---|
684 | $this->_num = 0; |
---|
685 | } |
---|
686 | |
---|
687 | function valid() { |
---|
688 | return isset($this->_cur);// && ($this->_cur->get_prev_sibling() === $this->_prev); |
---|
689 | } |
---|
690 | function key() { return $this->_num; } |
---|
691 | function current() { return $this->_cur; } |
---|
692 | |
---|
693 | function next() { |
---|
694 | |
---|
695 | $ret = $this->_cur; |
---|
696 | if ( !$ret ) |
---|
697 | return null; |
---|
698 | |
---|
699 | $this->_cur = $this->_cur->get_next_sibling(); |
---|
700 | $this->_num++; |
---|
701 | return $ret; |
---|
702 | } |
---|
703 | } |
---|
704 | |
---|
705 | //------------------------------------------------------------------------ |
---|
706 | |
---|
707 | /** |
---|
708 | * Pre-order IteratorAggregate |
---|
709 | * |
---|
710 | * @access private |
---|
711 | * @package dompdf |
---|
712 | */ |
---|
713 | class FrameTreeList implements IteratorAggregate { |
---|
714 | |
---|
715 | protected $_root; |
---|
716 | function __construct(Frame $root) { $this->_root = $root; } |
---|
717 | function getIterator() { return new FrameTreeIterator($this->_root); } |
---|
718 | |
---|
719 | } |
---|
720 | |
---|
721 | /** |
---|
722 | * Pre-order Iterator |
---|
723 | * |
---|
724 | * Returns frames in preorder traversal order (parent then children) |
---|
725 | * |
---|
726 | * @access private |
---|
727 | * @package dompdf |
---|
728 | */ |
---|
729 | class FrameTreeIterator implements Iterator { |
---|
730 | |
---|
731 | protected $_root; |
---|
732 | protected $_stack = array(); |
---|
733 | protected $_num; |
---|
734 | |
---|
735 | function __construct(Frame $root) { |
---|
736 | $this->_stack[] = $this->_root = $root; |
---|
737 | $this->_num = 0; |
---|
738 | } |
---|
739 | |
---|
740 | function rewind() { |
---|
741 | $this->_stack = array($this->_root); |
---|
742 | $this->_num = 0; |
---|
743 | } |
---|
744 | |
---|
745 | function valid() { return count($this->_stack) > 0; } |
---|
746 | function key() { return $this->_num; } |
---|
747 | function current() { return end($this->_stack); } |
---|
748 | |
---|
749 | function next() { |
---|
750 | $b = end($this->_stack); |
---|
751 | |
---|
752 | // Pop last element |
---|
753 | unset($this->_stack[ key($this->_stack) ]); |
---|
754 | $this->_num++; |
---|
755 | |
---|
756 | // Push all children onto the stack in reverse order |
---|
757 | if ( $c = $b->get_last_child() ) { |
---|
758 | $this->_stack[] = $c; |
---|
759 | while ( $c = $c->get_prev_sibling() ) |
---|
760 | $this->_stack[] = $c; |
---|
761 | } |
---|
762 | return $b; |
---|
763 | } |
---|
764 | } |
---|
765 | |
---|
766 | ?> |
---|