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_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: frame_reflower.cls.php,v 1.5 2006/07/07 21:31:03 benjcarson Exp $ */ |
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41 | |
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42 | /** |
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43 | * Base reflower class |
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44 | * |
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45 | * Reflower objects are responsible for determining the width and height of |
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46 | * individual frames. The also create line and page breaks as necessary. |
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47 | * |
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48 | * @access private |
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49 | * @package dompdf |
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50 | */ |
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51 | abstract class Frame_Reflower { |
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52 | protected $_frame; |
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53 | |
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54 | function __construct(Frame $frame) { |
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55 | $this->_frame = $frame; |
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56 | } |
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57 | |
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58 | function dispose() { |
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59 | unset($this->_frame); |
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60 | } |
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61 | |
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62 | protected function _collapse_margins() { |
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63 | $cb = $this->_frame->get_containing_block(); |
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64 | $style = $this->_frame->get_style(); |
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65 | |
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66 | $t = $style->length_in_pt($style->margin_top, $cb["h"]); |
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67 | $b = $style->length_in_pt($style->margin_bottom, $cb["w"]); |
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68 | |
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69 | // Handle 'auto' values |
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70 | if ( $t === "auto" ) { |
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71 | $style->margin_top = "0pt"; |
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72 | $t = 0; |
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73 | } |
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74 | |
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75 | if ( $b === "auto" ) { |
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76 | $style->margin_bottom = "0pt"; |
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77 | $b = 0; |
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78 | } |
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79 | |
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80 | // Collapse vertical margins: |
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81 | $n = $this->_frame->get_next_sibling(); |
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82 | while ( $n && !in_array($n->get_style()->display, Style::$BLOCK_TYPES) ) |
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83 | $n = $n->get_next_sibling(); |
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84 | |
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85 | if ( $n ) { // && !$n instanceof Page_Frame_Decorator ) { |
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86 | |
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87 | $b = max($b, $style->length_in_pt($n->get_style()->margin_top, $cb["w"])); |
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88 | |
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89 | $n->get_style()->margin_top = "$b pt"; |
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90 | $style->margin_bottom = "0 pt"; |
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91 | |
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92 | } |
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93 | |
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94 | // Collapse our first child's margin |
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95 | $f = $this->_frame->get_first_child(); |
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96 | while ( $f && !in_array($f->get_style()->display, Style::$BLOCK_TYPES) ) |
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97 | $f = $f->get_next_sibling(); |
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98 | |
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99 | if ( $f ) { |
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100 | $t = max( $t, $style->length_in_pt($f->get_style()->margin_top, $cb["w"])); |
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101 | $style->margin_top = "$t pt"; |
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102 | $f->get_style()->margin_top = "0 pt"; |
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103 | } |
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104 | |
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105 | } |
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106 | |
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107 | // Returns true if a new page is required |
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108 | protected function _check_new_page() { |
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109 | $y = $this->_frame->get_position("y"); |
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110 | $h = $style->length_in_pt($style->height); |
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111 | // Check if we need to move to a new page |
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112 | if ( $y + $h >= $this->_frame->get_root()->get_page_height() ) |
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113 | return true; |
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114 | |
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115 | } |
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116 | |
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117 | //........................................................................ |
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118 | |
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119 | abstract function reflow(); |
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120 | |
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121 | //........................................................................ |
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122 | |
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123 | // Required for table layout: Returns an array(0 => min, 1 => max, "min" |
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124 | // => min, "max" => max) of the minimum and maximum widths of this frame. |
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125 | // This provides a basic implementation. Child classes should override |
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126 | // this if necessary. |
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127 | function get_min_max_width() { |
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128 | $style = $this->_frame->get_style(); |
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129 | |
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130 | // Account for margins & padding |
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131 | $dims = array($style->padding_left, |
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132 | $style->padding_right, |
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133 | $style->border_left_width, |
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134 | $style->border_right_width, |
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135 | $style->margin_left, |
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136 | $style->margin_right); |
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137 | |
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138 | $delta = $style->length_in_pt($dims, $this->_frame->get_containing_block("w")); |
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139 | |
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140 | // Handle degenerate case |
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141 | if ( !$this->_frame->get_first_child() ) |
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142 | return array($delta, $delta,"min" => $delta, "max" => $delta); |
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143 | |
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144 | $low = array(); |
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145 | $high = array(); |
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146 | |
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147 | for ( $iter = $this->_frame->get_children()->getIterator(); |
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148 | $iter->valid(); |
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149 | $iter->next() ) { |
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150 | |
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151 | $inline_min = 0; |
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152 | $inline_max = 0; |
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153 | |
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154 | // Add all adjacent inline widths together to calculate max width |
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155 | while ( $iter->valid() && in_array( $iter->current()->get_style()->display, Style::$INLINE_TYPES ) ) { |
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156 | |
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157 | $child = $iter->current(); |
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158 | |
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159 | $minmax = $child->get_min_max_width(); |
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160 | |
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161 | if ( in_array( $iter->current()->get_style()->white_space, array("pre", "nowrap") ) ) |
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162 | $inline_min += $minmax["min"]; |
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163 | else |
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164 | $low[] = $minmax["min"]; |
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165 | |
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166 | $inline_max += $minmax["max"]; |
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167 | $iter->next(); |
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168 | |
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169 | } |
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170 | |
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171 | if ( $inline_max == 0 && $iter->valid() ) { |
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172 | list($low[], $high[]) = $iter->current()->get_min_max_width(); |
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173 | continue; |
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174 | } |
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175 | |
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176 | if ( $inline_max > 0 ) |
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177 | $high[] = $inline_max; |
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178 | |
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179 | if ( $inline_min > 0 ) |
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180 | $low[] = $inline_min; |
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181 | |
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182 | } |
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183 | |
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184 | $min = count($low) ? max($low) : 0; |
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185 | $max = count($high) ? max($high) : 0; |
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186 | |
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187 | // Use specified width if it is greater than the minimum defined by the |
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188 | // content. If the width is a percentage ignore it for now. |
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189 | $width = $style->width; |
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190 | if ( $width !== "auto" && !is_percent($width) ) { |
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191 | $width = $style->length_in_pt($width, $width); |
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192 | if ( $min < $width ) |
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193 | $min = $width; |
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194 | } |
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195 | |
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196 | $min += $delta; |
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197 | $max += $delta; |
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198 | |
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199 | return array($min, $max, "min"=>$min, "max"=>$max); |
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200 | } |
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201 | |
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202 | } |
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203 | |
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204 | ?> |
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