| 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,v 1.10 2006/07/07 21:31:04 benjcarson Exp $ */ |
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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 | } |
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| 68 | |
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| 69 | //........................................................................ |
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| 70 | |
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| 71 | protected function _assign_widths() { |
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| 72 | $style = $this->_frame->get_style(); |
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| 73 | |
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| 74 | // Find the min/max width of the table and sort the columns into |
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| 75 | // absolute/percent/auto arrays |
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| 76 | $min_width = $this->_state["min_width"]; |
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| 77 | $max_width = $this->_state["max_width"]; |
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| 78 | $percent_used = $this->_state["percent_used"]; |
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| 79 | $absolute_used = $this->_state["absolute_used"]; |
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| 80 | $auto_min = $this->_state["auto_min"]; |
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| 81 | |
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| 82 | $absolute =& $this->_state["absolute"]; |
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| 83 | $percent =& $this->_state["percent"]; |
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| 84 | $auto =& $this->_state["auto"]; |
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| 85 | |
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| 86 | // Determine the actual width of the table |
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| 87 | $cb = $this->_frame->get_containing_block(); |
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| 88 | $columns =& $this->_frame->get_cellmap()->get_columns(); |
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| 89 | |
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| 90 | $width = $style->width; |
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| 91 | |
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| 92 | // Calcluate padding & border fudge factor |
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| 93 | $left = $style->margin_left; |
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| 94 | $right = $style->margin_right; |
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| 95 | |
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| 96 | $left = $left == "auto" ? 0 : $style->length_in_pt($left, $cb["w"]); |
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| 97 | $right = $right == "auto" ? 0 : $style->length_in_pt($right, $cb["w"]); |
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| 98 | |
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| 99 | $delta = $left + $right + $style->length_in_pt(array($style->padding_left, |
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| 100 | $style->border_left_width, |
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| 101 | $style->border_right_width, |
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| 102 | $style->padding_right), $cb["w"]); |
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| 103 | |
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| 104 | $min_table_width = $style->length_in_pt( $style->min_width, $cb["w"] - $delta ); |
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| 105 | |
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| 106 | if ( $width !== "auto" ) { |
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| 107 | |
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| 108 | $preferred_width = $style->length_in_pt($width, $cb["w"]) - $delta; |
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| 109 | |
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| 110 | if ( $preferred_width < $min_table_width ) |
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| 111 | $preferred_width = $min_table_width; |
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| 112 | |
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| 113 | if ( $preferred_width > $min_width ) |
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| 114 | $width = $preferred_width; |
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| 115 | else |
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| 116 | $width = $min_width; |
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| 117 | |
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| 118 | } else { |
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| 119 | |
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| 120 | if ( $max_width + $delta < $cb["w"] ) |
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| 121 | $width = $max_width; |
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| 122 | else if ( $cb["w"] - $delta > $min_width ) |
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| 123 | $width = $cb["w"] - $delta; |
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| 124 | else |
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| 125 | $width = $min_width; |
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| 126 | |
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| 127 | if ( $width < $min_table_width ) |
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| 128 | $width = $min_table_width; |
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| 129 | |
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| 130 | } |
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| 131 | |
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| 132 | // Store our resolved width |
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| 133 | $style->width = $width; |
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| 134 | |
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| 135 | $cellmap = $this->_frame->get_cellmap(); |
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| 136 | |
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| 137 | // If the whole table fits on the page, then assign each column it's max width |
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| 138 | if ( $width == $max_width ) { |
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| 139 | |
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| 140 | foreach (array_keys($columns) as $i) |
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| 141 | $cellmap->set_column_width($i, $columns[$i]["max-width"]); |
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| 142 | |
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| 143 | return; |
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| 144 | } |
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| 145 | |
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| 146 | // Determine leftover and assign it evenly to all columns |
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| 147 | if ( $width > $min_width ) { |
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| 148 | |
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| 149 | // We have four cases to deal with: |
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| 150 | // |
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| 151 | // 1. All columns are auto--no widths have been specified. In this |
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| 152 | // case we distribute extra space across all columns weighted by max-width. |
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| 153 | // |
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| 154 | // 2. Only absolute widths have been specified. In this case we |
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| 155 | // distribute any extra space equally among 'width: auto' columns. |
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| 156 | // |
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| 157 | // 3. Only percentage widths have been specified. In this case we |
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| 158 | // normalize the percentage values and distribute any remaining % to |
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| 159 | // width: auto columns. We then proceed to assign widths as fractions |
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| 160 | // of the table width. |
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| 161 | // |
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| 162 | // 4. Both absolute and percentage widths have been specified. This |
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| 163 | // is annoying. |
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| 164 | |
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| 165 | // Case 1: |
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| 166 | if ( $absolute_used == 0 && $percent_used == 0 ) { |
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| 167 | $increment = $width - $min_width; |
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| 168 | |
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| 169 | foreach (array_keys($columns) as $i) |
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| 170 | $cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment * ($columns[$i]["max-width"] / $max_width)); |
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| 171 | return; |
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| 172 | } |
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| 173 | |
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| 174 | |
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| 175 | // Case 2 |
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| 176 | if ( $absolute_used > 0 && $percent_used == 0 ) { |
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| 177 | |
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| 178 | if ( count($auto) > 0 ) |
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| 179 | $increment = ($width - $auto_min - $absolute_used) / count($auto); |
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| 180 | else |
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| 181 | $increment = 0; |
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| 182 | |
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| 183 | // Use the absolutely specified width or the increment |
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| 184 | foreach (array_keys($columns) as $i) { |
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| 185 | |
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| 186 | if ( $columns[$i]["absolute"] > 0 ) |
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| 187 | $cellmap->set_column_width($i, $columns[$i]["min-width"]); |
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| 188 | else |
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| 189 | $cellmap->set_column_width($i,$columns[$i]["min-width"] + $increment); |
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| 190 | |
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| 191 | } |
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| 192 | return; |
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| 193 | } |
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| 194 | |
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| 195 | |
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| 196 | // Case 3: |
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| 197 | if ( $absolute_used == 0 && $percent_used > 0 ) { |
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| 198 | |
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| 199 | $scale = null; |
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| 200 | $remaining = null; |
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| 201 | |
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| 202 | // Scale percent values if the total percentage is > 100, or if all |
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| 203 | // values are specified as percentages. |
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| 204 | if ( $percent_used > 100 || count($auto) == 0) |
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| 205 | $scale = 100 / $percent_used; |
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| 206 | else |
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| 207 | $scale = 1; |
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| 208 | |
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| 209 | // Account for the minimum space used by the unassigned auto columns |
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| 210 | $used_width = $auto_min; |
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| 211 | |
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| 212 | foreach ($percent as $i) { |
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| 213 | $columns[$i]["percent"] *= $scale; |
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| 214 | |
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| 215 | $slack = $width - $used_width; |
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| 216 | |
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| 217 | $w = min($columns[$i]["percent"] * $width/100, $slack); |
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| 218 | |
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| 219 | if ( $w < $columns[$i]["min-width"] ) |
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| 220 | $w = $columns[$i]["min-width"]; |
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| 221 | |
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| 222 | $cellmap->set_column_width($i, $w); |
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| 223 | $used_width += $w; |
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| 224 | |
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| 225 | } |
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| 226 | |
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| 227 | // This works because $used_width includes the min-width of each |
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| 228 | // unassigned column |
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| 229 | if ( count($auto) > 0 ) { |
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| 230 | $increment = ($width - $used_width) / count($auto); |
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| 231 | |
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| 232 | foreach ($auto as $i) |
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| 233 | $cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment); |
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| 234 | |
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| 235 | } |
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| 236 | return; |
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| 237 | } |
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| 238 | |
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| 239 | // Case 4: |
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| 240 | |
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| 241 | // First-come, first served |
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| 242 | if ( $absolute_used > 0 && $percent_used > 0 ) { |
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| 243 | |
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| 244 | $used_width = $auto_min; |
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| 245 | |
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| 246 | foreach ($absolute as $i) { |
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| 247 | $cellmap->set_column_width($i, $columns[$i]["min-width"]); |
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| 248 | $used_width += $columns[$i]["min-width"]; |
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| 249 | } |
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| 250 | |
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| 251 | // Scale percent values if the total percentage is > 100 or there |
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| 252 | // are no auto values to take up slack |
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| 253 | if ( $percent_used > 100 || count($auto) == 0 ) |
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| 254 | $scale = 100 / $percent_used; |
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| 255 | else |
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| 256 | $scale = 1; |
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| 257 | |
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| 258 | $remaining_width = $width - $used_width; |
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| 259 | |
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| 260 | foreach ($percent as $i) { |
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| 261 | $slack = $remaining_width - $used_width; |
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| 262 | |
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| 263 | $columns[$i]["percent"] *= $scale; |
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| 264 | $w = min($columns[$i]["percent"] * $remaining_width / 100, $slack); |
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| 265 | |
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| 266 | if ( $w < $columns[$i]["min-width"] ) |
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| 267 | $w = $columns[$i]["min-width"]; |
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| 268 | |
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| 269 | $columns[$i]["used-width"] = $w; |
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| 270 | $used_width += $w; |
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| 271 | } |
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| 272 | |
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| 273 | if ( count($auto) > 0 ) { |
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| 274 | $increment = ($width - $used_width) / count($auto); |
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| 275 | |
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| 276 | foreach ($auto as $i) |
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| 277 | $cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment); |
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| 278 | |
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| 279 | } |
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| 280 | |
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| 281 | return; |
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| 282 | } |
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| 283 | |
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| 284 | |
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| 285 | } else { // we are over constrained |
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| 286 | |
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| 287 | // Each column gets its minimum width |
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| 288 | foreach (array_keys($columns) as $i) |
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| 289 | $cellmap->set_column_width($i, $columns[$i]["min-width"]); |
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| 290 | |
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| 291 | } |
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| 292 | } |
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| 293 | |
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| 294 | //........................................................................ |
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| 295 | |
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| 296 | // Determine the frame's height based on min/max height |
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| 297 | protected function _calculate_height() { |
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| 298 | |
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| 299 | $style = $this->_frame->get_style(); |
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| 300 | $height = $style->height; |
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| 301 | |
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| 302 | $cellmap = $this->_frame->get_cellmap(); |
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| 303 | $cellmap->assign_frame_heights(); |
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| 304 | $rows = $cellmap->get_rows(); |
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| 305 | |
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| 306 | // Determine our content height |
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| 307 | $content_height = 0; |
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| 308 | foreach ( $rows as $r ) |
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| 309 | $content_height += $r["height"]; |
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| 310 | |
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| 311 | $cb = $this->_frame->get_containing_block(); |
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| 312 | |
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| 313 | if ( !($style->overflow === "visible" || |
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| 314 | ($style->overflow === "hidden" && $height === "auto")) ) { |
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| 315 | |
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| 316 | // Only handle min/max height if the height is independent of the frame's content |
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| 317 | |
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| 318 | $min_height = $style->min_height; |
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| 319 | $max_height = $style->max_height; |
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| 320 | |
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| 321 | if ( isset($cb["h"]) ) { |
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| 322 | $min_height = $style->length_in_pt($min_height, $cb["h"]); |
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| 323 | $max_height = $style->length_in_pt($max_height, $cb["h"]); |
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| 324 | |
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| 325 | } else if ( isset($cb["w"]) ) { |
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| 326 | |
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| 327 | if ( mb_strpos($min_height, "%") !== false ) |
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| 328 | $min_height = 0; |
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| 329 | else |
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| 330 | $min_height = $style->length_in_pt($min_height, $cb["w"]); |
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| 331 | |
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| 332 | if ( mb_strpos($max_height, "%") !== false ) |
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| 333 | $max_height = "none"; |
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| 334 | else |
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| 335 | $max_height = $style->length_in_pt($max_height, $cb["w"]); |
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| 336 | } |
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| 337 | |
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| 338 | if ( $max_height !== "none" && $min_height > $max_height ) |
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| 339 | // Swap 'em |
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| 340 | list($max_height, $min_height) = array($min_height, $max_height); |
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| 341 | |
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| 342 | if ( $max_height !== "none" && $height > $max_height ) |
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| 343 | $height = $max_height; |
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| 344 | |
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| 345 | if ( $height < $min_height ) |
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| 346 | $height = $min_height; |
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| 347 | |
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| 348 | } else { |
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| 349 | |
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| 350 | // Use the content height or the height value, whichever is greater |
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| 351 | if ( $height !== "auto" ) { |
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| 352 | $height = $style->length_in_pt($height, $cb["h"]); |
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| 353 | |
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| 354 | if ( $height <= $content_height ) |
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| 355 | $height = $content_height; |
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| 356 | else |
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| 357 | $cellmap->set_frame_heights($height,$content_height); |
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| 358 | |
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| 359 | } else |
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| 360 | $height = $content_height; |
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| 361 | |
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| 362 | } |
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| 363 | |
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| 364 | |
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| 365 | return $height; |
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| 366 | |
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| 367 | } |
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| 368 | //........................................................................ |
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| 369 | |
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| 370 | function reflow() { |
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| 371 | |
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| 372 | // Check if a page break is forced |
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| 373 | $page = $this->_frame->get_root(); |
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| 374 | $page->check_forced_page_break($this->_frame); |
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| 375 | |
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| 376 | // Bail if the page is full |
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| 377 | if ( $page->is_full() ) |
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| 378 | return; |
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| 379 | |
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| 380 | // Let the page know that we're reflowing a table so that splits |
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| 381 | // are suppressed (simply setting page-break-inside: avoid won't |
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| 382 | // work because we may have an arbitrary number of block elements |
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| 383 | // inside tds.) |
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| 384 | $page->table_reflow_start(); |
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| 385 | |
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| 386 | // Collapse vertical margins, if required |
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| 387 | $this->_collapse_margins(); |
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| 388 | |
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| 389 | $this->_frame->position(); |
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| 390 | |
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| 391 | // Table layout algorithm: |
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| 392 | // http://www.w3.org/TR/CSS21/tables.html#auto-table-layout |
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| 393 | |
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| 394 | if ( is_null($this->_state) ) |
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| 395 | $this->get_min_max_width(); |
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| 396 | |
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| 397 | $cb = $this->_frame->get_containing_block(); |
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| 398 | $style = $this->_frame->get_style(); |
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| 399 | |
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| 400 | // This is slightly inexact, but should be okay. Add half the |
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| 401 | // border-spacing to the table as padding. The other half is added to |
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| 402 | // the cells themselves. |
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| 403 | if ( $style->border_collapse === "separate" ) { |
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| 404 | list($h, $v) = $style->border_spacing; |
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| 405 | |
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| 406 | $v = $style->length_in_pt($v) / 2; |
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| 407 | $h = $style->length_in_pt($h) / 2; |
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| 408 | |
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| 409 | $style->padding_left = $style->length_in_pt($style->padding_left, $cb["w"]) + $h; |
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| 410 | $style->padding_right = $style->length_in_pt($style->padding_right, $cb["w"]) + $h; |
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| 411 | $style->padding_top = $style->length_in_pt($style->padding_top, $cb["w"]) + $v; |
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| 412 | $style->padding_bottom = $style->length_in_pt($style->padding_bottom, $cb["w"]) + $v; |
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| 413 | |
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| 414 | } |
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| 415 | |
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| 416 | $this->_assign_widths(); |
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| 417 | |
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| 418 | // Adjust left & right margins, if they are auto |
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| 419 | $width = $style->width; |
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| 420 | $left = $style->margin_left; |
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| 421 | $right = $style->margin_right; |
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| 422 | |
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| 423 | $diff = $cb["w"] - $width; |
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| 424 | |
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| 425 | if ( $left === "auto" && $right === "auto" && $diff > 0 ) { |
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| 426 | $left = $right = $diff / 2; |
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| 427 | $style->margin_left = "$left pt"; |
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| 428 | $style->margin_right = "$right pt"; |
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| 429 | |
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| 430 | } else { |
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| 431 | $left = $style->length_in_pt($left, $cb["w"]); |
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| 432 | $right = $style->length_in_pt($right, $cb["w"]); |
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| 433 | } |
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| 434 | |
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| 435 | |
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| 436 | list($x, $y) = $this->_frame->get_position(); |
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| 437 | |
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| 438 | // Determine the content edge |
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| 439 | $content_x = $x + $left + $style->length_in_pt(array($style->padding_left, |
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| 440 | $style->border_left_width), $cb["w"]); |
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| 441 | $content_y = $y + $style->length_in_pt(array($style->margin_top, |
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| 442 | $style->border_top_width, |
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| 443 | $style->padding_top), $cb["w"]); |
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| 444 | |
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| 445 | if ( isset($cb["h"]) ) |
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| 446 | $h = $cb["h"]; |
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| 447 | else |
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| 448 | $h = null; |
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| 449 | |
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| 450 | |
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| 451 | $cellmap = $this->_frame->get_cellmap(); |
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| 452 | $col =& $cellmap->get_column(0); |
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| 453 | $col["x"] = $content_x; |
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| 454 | |
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| 455 | $row =& $cellmap->get_row(0); |
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| 456 | $row["y"] = $content_y; |
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| 457 | |
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| 458 | $cellmap->assign_x_positions(); |
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| 459 | |
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| 460 | // Set the containing block of each child & reflow |
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| 461 | foreach ( $this->_frame->get_children() as $child ) { |
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| 462 | |
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| 463 | // Bail if the page is full |
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| 464 | if ( $page->is_full() ) |
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| 465 | break; |
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| 466 | |
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| 467 | $child->set_containing_block($content_x, $content_y, $width, $h); |
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| 468 | $child->reflow(); |
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| 469 | |
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| 470 | // Check if a split has occured |
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| 471 | $page->check_page_break($child); |
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| 472 | |
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| 473 | } |
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| 474 | |
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| 475 | // Assign heights to our cells: |
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| 476 | $style->height = $this->_calculate_height(); |
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| 477 | |
|---|
| 478 | if ( $style->border_collapse === "collapse" ) { |
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| 479 | // Unset our borders because our cells are now using them |
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| 480 | $style->border_style = "none"; |
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| 481 | } |
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| 482 | |
|---|
| 483 | $page->table_reflow_end(); |
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| 484 | |
|---|
| 485 | // Debugging: |
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| 486 | //echo ($this->_frame->get_cellmap()); |
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| 487 | } |
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| 488 | |
|---|
| 489 | //........................................................................ |
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| 490 | |
|---|
| 491 | function get_min_max_width() { |
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| 492 | $style = $this->_frame->get_style(); |
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| 493 | |
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| 494 | $this->_frame->normalise(); |
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| 495 | |
|---|
| 496 | // Add the cells to the cellmap (this will calcluate column widths as |
|---|
| 497 | // frames are added) |
|---|
| 498 | $this->_frame->get_cellmap()->add_frame($this->_frame); |
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| 499 | |
|---|
| 500 | // Find the min/max width of the table and sort the columns into |
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| 501 | // absolute/percent/auto arrays |
|---|
| 502 | $this->_state = array(); |
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| 503 | $this->_state["min_width"] = 0; |
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| 504 | $this->_state["max_width"] = 0; |
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| 505 | |
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| 506 | $this->_state["percent_used"] = 0; |
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| 507 | $this->_state["absolute_used"] = 0; |
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| 508 | $this->_state["auto_min"] = 0; |
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| 509 | |
|---|
| 510 | $this->_state["absolute"] = array(); |
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| 511 | $this->_state["percent"] = array(); |
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| 512 | $this->_state["auto"] = array(); |
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| 513 | |
|---|
| 514 | $columns =& $this->_frame->get_cellmap()->get_columns(); |
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| 515 | foreach (array_keys($columns) as $i) { |
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| 516 | $this->_state["min_width"] += $columns[$i]["min-width"]; |
|---|
| 517 | $this->_state["max_width"] += $columns[$i]["max-width"]; |
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| 518 | |
|---|
| 519 | if ( $columns[$i]["absolute"] > 0 ) { |
|---|
| 520 | $this->_state["absolute"][] = $i; |
|---|
| 521 | $this->_state["absolute_used"] += $columns[$i]["absolute"]; |
|---|
| 522 | |
|---|
| 523 | } else if ( $columns[$i]["percent"] > 0 ) { |
|---|
| 524 | $this->_state["percent"][] = $i; |
|---|
| 525 | $this->_state["percent_used"] += $columns[$i]["percent"]; |
|---|
| 526 | |
|---|
| 527 | } else { |
|---|
| 528 | $this->_state["auto"][] = $i; |
|---|
| 529 | $this->_state["auto_min"] += $columns[$i]["min-width"]; |
|---|
| 530 | } |
|---|
| 531 | } |
|---|
| 532 | |
|---|
| 533 | return array($this->_state["min_width"], $this->_state["max_width"], |
|---|
| 534 | "min" => $this->_state["min_width"], "max" => $this->_state["max_width"]); |
|---|
| 535 | } |
|---|
| 536 | } |
|---|
| 537 | |
|---|
| 538 | ?> |
|---|
