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: table_frame_reflower.cls.php,v $ |
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6 | * Created on: 2004-06-17 |
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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: table_frame_reflower.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 | * Reflows tables |
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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 Table_Frame_Reflower extends Frame_Reflower { |
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49 | |
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50 | /** |
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51 | * Cache of results between call to get_min_max_width and assign_widths |
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52 | * |
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53 | * @var array |
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54 | */ |
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55 | protected $_state; |
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56 | |
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57 | function __construct(Table_Frame_Decorator $frame) { |
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58 | $this->_state = null; |
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59 | parent::__construct($frame); |
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60 | } |
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61 | |
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62 | /** |
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63 | * State is held here so it needs to be reset along with the decorator |
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64 | */ |
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65 | function reset() { |
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66 | $this->_state = null; |
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67 | $this->_min_max_cache = null; |
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68 | } |
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69 | |
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70 | //........................................................................ |
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71 | |
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72 | protected function _assign_widths() { |
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73 | $style = $this->_frame->get_style(); |
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74 | |
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75 | // Find the min/max width of the table and sort the columns into |
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76 | // absolute/percent/auto arrays |
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77 | $min_width = $this->_state["min_width"]; |
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78 | $max_width = $this->_state["max_width"]; |
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79 | $percent_used = $this->_state["percent_used"]; |
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80 | $absolute_used = $this->_state["absolute_used"]; |
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81 | $auto_min = $this->_state["auto_min"]; |
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82 | |
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83 | $absolute =& $this->_state["absolute"]; |
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84 | $percent =& $this->_state["percent"]; |
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85 | $auto =& $this->_state["auto"]; |
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86 | |
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87 | // Determine the actual width of the table |
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88 | $cb = $this->_frame->get_containing_block(); |
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89 | $columns =& $this->_frame->get_cellmap()->get_columns(); |
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90 | |
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91 | $width = $style->width; |
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92 | |
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93 | // Calcluate padding & border fudge factor |
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94 | $left = $style->margin_left; |
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95 | $right = $style->margin_right; |
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96 | |
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97 | $left = $left == "auto" ? 0 : $style->length_in_pt($left, $cb["w"]); |
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98 | $right = $right == "auto" ? 0 : $style->length_in_pt($right, $cb["w"]); |
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99 | |
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100 | $delta = $left + $right + $style->length_in_pt(array($style->padding_left, |
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101 | $style->border_left_width, |
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102 | $style->border_right_width, |
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103 | $style->padding_right), $cb["w"]); |
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104 | |
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105 | $min_table_width = $style->length_in_pt( $style->min_width, $cb["w"] - $delta ); |
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106 | |
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107 | // min & max widths already include borders & padding |
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108 | $min_width -= $delta; |
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109 | $max_width -= $delta; |
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110 | |
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111 | if ( $width !== "auto" ) { |
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112 | |
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113 | $preferred_width = $style->length_in_pt($width, $cb["w"]) - $delta; |
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114 | |
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115 | if ( $preferred_width < $min_table_width ) |
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116 | $preferred_width = $min_table_width; |
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117 | |
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118 | if ( $preferred_width > $min_width ) |
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119 | $width = $preferred_width; |
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120 | else |
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121 | $width = $min_width; |
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122 | |
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123 | } else { |
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124 | |
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125 | if ( $max_width + $delta < $cb["w"] ) |
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126 | $width = $max_width; |
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127 | else if ( $cb["w"] - $delta > $min_width ) |
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128 | $width = $cb["w"] - $delta; |
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129 | else |
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130 | $width = $min_width; |
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131 | |
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132 | if ( $width < $min_table_width ) |
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133 | $width = $min_table_width; |
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134 | |
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135 | } |
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136 | |
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137 | // Store our resolved width |
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138 | $style->width = $width; |
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139 | |
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140 | $cellmap = $this->_frame->get_cellmap(); |
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141 | |
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142 | // If the whole table fits on the page, then assign each column it's max width |
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143 | if ( $width == $max_width ) { |
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144 | |
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145 | foreach (array_keys($columns) as $i) |
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146 | $cellmap->set_column_width($i, $columns[$i]["max-width"]); |
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147 | |
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148 | return; |
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149 | } |
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150 | |
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151 | // Determine leftover and assign it evenly to all columns |
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152 | if ( $width > $min_width ) { |
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153 | |
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154 | // We have four cases to deal with: |
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155 | // |
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156 | // 1. All columns are auto--no widths have been specified. In this |
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157 | // case we distribute extra space across all columns weighted by max-width. |
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158 | // |
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159 | // 2. Only absolute widths have been specified. In this case we |
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160 | // distribute any extra space equally among 'width: auto' columns, or all |
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161 | // columns if no auto columns have been specified. |
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162 | // |
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163 | // 3. Only percentage widths have been specified. In this case we |
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164 | // normalize the percentage values and distribute any remaining % to |
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165 | // width: auto columns. We then proceed to assign widths as fractions |
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166 | // of the table width. |
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167 | // |
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168 | // 4. Both absolute and percentage widths have been specified. |
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169 | |
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170 | // Case 1: |
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171 | if ( $absolute_used == 0 && $percent_used == 0 ) { |
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172 | $increment = $width - $min_width; |
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173 | |
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174 | foreach (array_keys($columns) as $i) |
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175 | $cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment * ($columns[$i]["max-width"] / $max_width)); |
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176 | return; |
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177 | } |
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178 | |
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179 | |
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180 | // Case 2 |
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181 | if ( $absolute_used > 0 && $percent_used == 0 ) { |
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182 | |
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183 | if ( count($auto) > 0 ) |
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184 | $increment = ($width - $auto_min - $absolute_used) / count($auto); |
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185 | |
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186 | // Use the absolutely specified width or the increment |
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187 | foreach (array_keys($columns) as $i) { |
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188 | |
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189 | if ( $columns[$i]["absolute"] > 0 && count($auto) ) |
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190 | $cellmap->set_column_width($i, $columns[$i]["min-width"]); |
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191 | else if ( count($auto) ) |
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192 | $cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment); |
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193 | else { |
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194 | // All absolute columns |
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195 | $increment = ($width - $absolute_used) * $columns[$i]["absolute"] / $absolute_used; |
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196 | |
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197 | $cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment); |
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198 | } |
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199 | |
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200 | } |
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201 | return; |
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202 | } |
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203 | |
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204 | |
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205 | // Case 3: |
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206 | if ( $absolute_used == 0 && $percent_used > 0 ) { |
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207 | |
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208 | $scale = null; |
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209 | $remaining = null; |
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210 | |
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211 | // Scale percent values if the total percentage is > 100, or if all |
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212 | // values are specified as percentages. |
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213 | if ( $percent_used > 100 || count($auto) == 0) |
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214 | $scale = 100 / $percent_used; |
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215 | else |
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216 | $scale = 1; |
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217 | |
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218 | // Account for the minimum space used by the unassigned auto columns |
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219 | $used_width = $auto_min; |
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220 | |
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221 | foreach ($percent as $i) { |
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222 | $columns[$i]["percent"] *= $scale; |
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223 | |
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224 | $slack = $width - $used_width; |
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225 | |
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226 | $w = min($columns[$i]["percent"] * $width/100, $slack); |
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227 | |
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228 | if ( $w < $columns[$i]["min-width"] ) |
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229 | $w = $columns[$i]["min-width"]; |
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230 | |
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231 | $cellmap->set_column_width($i, $w); |
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232 | $used_width += $w; |
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233 | |
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234 | } |
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235 | |
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236 | // This works because $used_width includes the min-width of each |
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237 | // unassigned column |
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238 | if ( count($auto) > 0 ) { |
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239 | $increment = ($width - $used_width) / count($auto); |
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240 | |
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241 | foreach ($auto as $i) |
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242 | $cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment); |
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243 | |
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244 | } |
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245 | return; |
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246 | } |
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247 | |
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248 | // Case 4: |
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249 | |
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250 | // First-come, first served |
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251 | if ( $absolute_used > 0 && $percent_used > 0 ) { |
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252 | |
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253 | $used_width = $auto_min; |
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254 | |
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255 | foreach ($absolute as $i) { |
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256 | $cellmap->set_column_width($i, $columns[$i]["min-width"]); |
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257 | $used_width += $columns[$i]["min-width"]; |
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258 | } |
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259 | |
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260 | // Scale percent values if the total percentage is > 100 or there |
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261 | // are no auto values to take up slack |
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262 | if ( $percent_used > 100 || count($auto) == 0 ) |
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263 | $scale = 100 / $percent_used; |
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264 | else |
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265 | $scale = 1; |
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266 | |
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267 | $remaining_width = $width - $used_width; |
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268 | |
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269 | foreach ($percent as $i) { |
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270 | $slack = $remaining_width - $used_width; |
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271 | |
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272 | $columns[$i]["percent"] *= $scale; |
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273 | $w = min($columns[$i]["percent"] * $remaining_width / 100, $slack); |
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274 | |
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275 | if ( $w < $columns[$i]["min-width"] ) |
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276 | $w = $columns[$i]["min-width"]; |
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277 | |
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278 | $columns[$i]["used-width"] = $w; |
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279 | $used_width += $w; |
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280 | } |
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281 | |
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282 | if ( count($auto) > 0 ) { |
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283 | $increment = ($width - $used_width) / count($auto); |
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284 | |
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285 | foreach ($auto as $i) |
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286 | $cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment); |
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287 | |
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288 | } |
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289 | |
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290 | return; |
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291 | } |
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292 | |
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293 | |
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294 | } else { // we are over constrained |
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295 | |
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296 | // Each column gets its minimum width |
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297 | foreach (array_keys($columns) as $i) |
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298 | $cellmap->set_column_width($i, $columns[$i]["min-width"]); |
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299 | |
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300 | } |
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301 | } |
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302 | |
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303 | //........................................................................ |
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304 | |
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305 | // Determine the frame's height based on min/max height |
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306 | protected function _calculate_height() { |
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307 | |
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308 | $style = $this->_frame->get_style(); |
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309 | $height = $style->height; |
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310 | |
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311 | $cellmap = $this->_frame->get_cellmap(); |
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312 | $cellmap->assign_frame_heights(); |
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313 | $rows = $cellmap->get_rows(); |
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314 | |
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315 | // Determine our content height |
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316 | $content_height = 0; |
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317 | foreach ( $rows as $r ) |
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318 | $content_height += $r["height"]; |
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319 | |
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320 | $cb = $this->_frame->get_containing_block(); |
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321 | |
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322 | if ( !($style->overflow === "visible" || |
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323 | ($style->overflow === "hidden" && $height === "auto")) ) { |
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324 | |
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325 | // Only handle min/max height if the height is independent of the frame's content |
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326 | |
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327 | $min_height = $style->min_height; |
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328 | $max_height = $style->max_height; |
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329 | |
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330 | if ( isset($cb["h"]) ) { |
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331 | $min_height = $style->length_in_pt($min_height, $cb["h"]); |
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332 | $max_height = $style->length_in_pt($max_height, $cb["h"]); |
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333 | |
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334 | } else if ( isset($cb["w"]) ) { |
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335 | |
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336 | if ( mb_strpos($min_height, "%") !== false ) |
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337 | $min_height = 0; |
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338 | else |
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339 | $min_height = $style->length_in_pt($min_height, $cb["w"]); |
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340 | |
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341 | if ( mb_strpos($max_height, "%") !== false ) |
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342 | $max_height = "none"; |
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343 | else |
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344 | $max_height = $style->length_in_pt($max_height, $cb["w"]); |
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345 | } |
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346 | |
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347 | if ( $max_height !== "none" && $min_height > $max_height ) |
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348 | // Swap 'em |
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349 | list($max_height, $min_height) = array($min_height, $max_height); |
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350 | |
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351 | if ( $max_height !== "none" && $height > $max_height ) |
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352 | $height = $max_height; |
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353 | |
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354 | if ( $height < $min_height ) |
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355 | $height = $min_height; |
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356 | |
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357 | } else { |
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358 | |
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359 | // Use the content height or the height value, whichever is greater |
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360 | if ( $height !== "auto" ) { |
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361 | $height = $style->length_in_pt($height, $cb["h"]); |
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362 | |
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363 | if ( $height <= $content_height ) |
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364 | $height = $content_height; |
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365 | else |
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366 | $cellmap->set_frame_heights($height,$content_height); |
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367 | |
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368 | } else |
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369 | $height = $content_height; |
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370 | |
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371 | } |
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372 | |
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373 | return $height; |
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374 | |
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375 | } |
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376 | //........................................................................ |
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377 | |
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378 | function reflow() { |
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379 | |
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380 | // Check if a page break is forced |
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381 | $page = $this->_frame->get_root(); |
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382 | $page->check_forced_page_break($this->_frame); |
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383 | |
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384 | // Bail if the page is full |
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385 | if ( $page->is_full() ) |
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386 | return; |
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387 | |
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388 | // Let the page know that we're reflowing a table so that splits |
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389 | // are suppressed (simply setting page-break-inside: avoid won't |
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390 | // work because we may have an arbitrary number of block elements |
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391 | // inside tds.) |
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392 | $page->table_reflow_start(); |
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393 | |
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394 | |
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395 | // Collapse vertical margins, if required |
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396 | $this->_collapse_margins(); |
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397 | |
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398 | $this->_frame->position(); |
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399 | |
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400 | // Table layout algorithm: |
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401 | // http://www.w3.org/TR/CSS21/tables.html#auto-table-layout |
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402 | |
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403 | if ( is_null($this->_state) ) |
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404 | $this->get_min_max_width(); |
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405 | |
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406 | $cb = $this->_frame->get_containing_block(); |
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407 | $style = $this->_frame->get_style(); |
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408 | |
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409 | // This is slightly inexact, but should be okay. Add half the |
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410 | // border-spacing to the table as padding. The other half is added to |
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411 | // the cells themselves. |
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412 | if ( $style->border_collapse === "separate" ) { |
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413 | list($h, $v) = $style->border_spacing; |
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414 | |
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415 | $v = $style->length_in_pt($v) / 2; |
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416 | $h = $style->length_in_pt($h) / 2; |
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417 | |
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418 | $style->padding_left = $style->length_in_pt($style->padding_left, $cb["w"]) + $h; |
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419 | $style->padding_right = $style->length_in_pt($style->padding_right, $cb["w"]) + $h; |
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420 | $style->padding_top = $style->length_in_pt($style->padding_top, $cb["w"]) + $v; |
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421 | $style->padding_bottom = $style->length_in_pt($style->padding_bottom, $cb["w"]) + $v; |
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422 | |
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423 | } |
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424 | |
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425 | $this->_assign_widths(); |
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426 | |
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427 | // Adjust left & right margins, if they are auto |
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428 | $width = $style->width; |
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429 | $left = $style->margin_left; |
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430 | $right = $style->margin_right; |
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431 | |
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432 | $diff = $cb["w"] - $width; |
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433 | |
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434 | if ( $left === "auto" && $right === "auto" && $diff > 0 ) { |
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435 | $left = $right = $diff / 2; |
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436 | $style->margin_left = "$left pt"; |
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437 | $style->margin_right = "$right pt"; |
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438 | |
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439 | } else { |
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440 | $left = $style->length_in_pt($left, $cb["w"]); |
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441 | $right = $style->length_in_pt($right, $cb["w"]); |
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442 | } |
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443 | |
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444 | |
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445 | list($x, $y) = $this->_frame->get_position(); |
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446 | |
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447 | // Determine the content edge |
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448 | $content_x = $x + $left + $style->length_in_pt(array($style->padding_left, |
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449 | $style->border_left_width), $cb["w"]); |
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450 | $content_y = $y + $style->length_in_pt(array($style->margin_top, |
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451 | $style->border_top_width, |
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452 | $style->padding_top), $cb["w"]); |
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453 | |
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454 | if ( isset($cb["h"]) ) |
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455 | $h = $cb["h"]; |
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456 | else |
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457 | $h = null; |
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458 | |
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459 | |
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460 | $cellmap = $this->_frame->get_cellmap(); |
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461 | $col =& $cellmap->get_column(0); |
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462 | $col["x"] = $content_x; |
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463 | |
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464 | $row =& $cellmap->get_row(0); |
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465 | $row["y"] = $content_y; |
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466 | |
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467 | $cellmap->assign_x_positions(); |
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468 | |
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469 | // Set the containing block of each child & reflow |
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470 | foreach ( $this->_frame->get_children() as $child ) { |
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471 | |
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472 | // Bail if the page is full |
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473 | if ( !$page->in_nested_table() && $page->is_full() ) |
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474 | break; |
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475 | |
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476 | $child->set_containing_block($content_x, $content_y, $width, $h); |
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477 | $child->reflow(); |
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478 | |
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479 | if ( !$page->in_nested_table() ) |
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480 | // Check if a split has occured |
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481 | $page->check_page_break($child); |
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482 | |
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483 | } |
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484 | |
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485 | // Assign heights to our cells: |
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486 | $style->height = $this->_calculate_height(); |
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487 | |
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488 | if ( $style->border_collapse === "collapse" ) { |
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489 | // Unset our borders because our cells are now using them |
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490 | $style->border_style = "none"; |
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491 | } |
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492 | |
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493 | $page->table_reflow_end(); |
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494 | |
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495 | // Debugging: |
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496 | //echo ($this->_frame->get_cellmap()); |
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497 | } |
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498 | |
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499 | //........................................................................ |
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500 | |
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501 | function get_min_max_width() { |
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502 | |
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503 | if ( !is_null($this->_min_max_cache) ) |
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504 | return $this->_min_max_cache; |
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505 | |
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506 | $style = $this->_frame->get_style(); |
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507 | |
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508 | $this->_frame->normalise(); |
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509 | |
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510 | // Add the cells to the cellmap (this will calcluate column widths as |
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511 | // frames are added) |
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512 | $this->_frame->get_cellmap()->add_frame($this->_frame); |
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513 | |
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514 | // Find the min/max width of the table and sort the columns into |
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515 | // absolute/percent/auto arrays |
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516 | $this->_state = array(); |
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517 | $this->_state["min_width"] = 0; |
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518 | $this->_state["max_width"] = 0; |
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519 | |
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520 | $this->_state["percent_used"] = 0; |
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521 | $this->_state["absolute_used"] = 0; |
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522 | $this->_state["auto_min"] = 0; |
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523 | |
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524 | $this->_state["absolute"] = array(); |
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525 | $this->_state["percent"] = array(); |
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526 | $this->_state["auto"] = array(); |
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527 | |
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528 | $columns =& $this->_frame->get_cellmap()->get_columns(); |
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529 | foreach (array_keys($columns) as $i) { |
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530 | $this->_state["min_width"] += $columns[$i]["min-width"]; |
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531 | $this->_state["max_width"] += $columns[$i]["max-width"]; |
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532 | |
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533 | if ( $columns[$i]["absolute"] > 0 ) { |
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534 | $this->_state["absolute"][] = $i; |
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535 | $this->_state["absolute_used"] += $columns[$i]["absolute"]; |
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536 | |
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537 | } else if ( $columns[$i]["percent"] > 0 ) { |
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538 | $this->_state["percent"][] = $i; |
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539 | $this->_state["percent_used"] += $columns[$i]["percent"]; |
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540 | |
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541 | } else { |
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542 | $this->_state["auto"][] = $i; |
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543 | $this->_state["auto_min"] += $columns[$i]["min-width"]; |
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544 | } |
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545 | } |
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546 | |
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547 | // Account for margins & padding |
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548 | $dims = array($style->border_left_width, |
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549 | $style->border_right_width, |
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550 | $style->padding_left, |
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551 | $style->padding_right, |
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552 | $style->margin_left, |
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553 | $style->margin_right); |
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554 | |
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555 | if ( $style->border_collapse != "collapse" ) |
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556 | list($dims[]) = $style->border_spacing; |
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557 | |
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558 | $delta = $style->length_in_pt($dims, $this->_frame->get_containing_block("w")); |
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559 | |
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560 | $this->_state["min_width"] += $delta; |
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561 | $this->_state["max_width"] += $delta; |
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562 | |
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563 | return $this->_min_max_cache = array($this->_state["min_width"], $this->_state["max_width"], |
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564 | "min" => $this->_state["min_width"], "max" => $this->_state["max_width"]); |
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565 | } |
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566 | } |
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567 | |
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568 | ?> |
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