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<?php
/**
* DOMPDF - PHP5 HTML to PDF renderer
*
* File: $RCSfile: table_frame_reflower.cls.php,v $
* Created on: 2004-06-17
*
* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library in the file LICENSE.LGPL; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
* Alternatively, you may distribute this software under the terms of the
* PHP License, version 3.0 or later. A copy of this license should have
* been distributed with this file in the file LICENSE.PHP . If this is not
* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
*
* The latest version of DOMPDF might be available at:
* http://www.digitaljunkies.ca/dompdf
*
* @link http://www.digitaljunkies.ca/dompdf
* @copyright 2004 Benj Carson
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @package dompdf
* @version 0.5.1
*/
/* $Id: table_frame_reflower.cls.php,v 1.10 2006/07/07 21:31:04 benjcarson Exp $ */
/**
* Reflows tables
*
* @access private
* @package dompdf
*/
class Table_Frame_Reflower extends Frame_Reflower {
/**
* Cache of results between call to get_min_max_width and assign_widths
*
* @var array
*/
protected $_state;
function __construct(Table_Frame_Decorator $frame) {
$this->_state = null;
parent::__construct($frame);
}
/**
* State is held here so it needs to be reset along with the decorator
*/
function reset() {
$this->_state = null;
}
//........................................................................
protected function _assign_widths() {
$style = $this->_frame->get_style();
// Find the min/max width of the table and sort the columns into
// absolute/percent/auto arrays
$min_width = $this->_state["min_width"];
$max_width = $this->_state["max_width"];
$percent_used = $this->_state["percent_used"];
$absolute_used = $this->_state["absolute_used"];
$auto_min = $this->_state["auto_min"];
$absolute =& $this->_state["absolute"];
$percent =& $this->_state["percent"];
$auto =& $this->_state["auto"];
// Determine the actual width of the table
$cb = $this->_frame->get_containing_block();
$columns =& $this->_frame->get_cellmap()->get_columns();
$width = $style->width;
// Calcluate padding & border fudge factor
$left = $style->margin_left;
$right = $style->margin_right;
$left = $left == "auto" ? 0 : $style->length_in_pt($left, $cb["w"]);
$right = $right == "auto" ? 0 : $style->length_in_pt($right, $cb["w"]);
$delta = $left + $right + $style->length_in_pt(array($style->padding_left,
$style->border_left_width,
$style->border_right_width,
$style->padding_right), $cb["w"]);
$min_table_width = $style->length_in_pt( $style->min_width, $cb["w"] - $delta );
if ( $width !== "auto" ) {
$preferred_width = $style->length_in_pt($width, $cb["w"]) - $delta;
if ( $preferred_width < $min_table_width )
$preferred_width = $min_table_width;
if ( $preferred_width > $min_width )
$width = $preferred_width;
else
$width = $min_width;
} else {
if ( $max_width + $delta < $cb["w"] )
$width = $max_width;
else if ( $cb["w"] - $delta > $min_width )
$width = $cb["w"] - $delta;
else
$width = $min_width;
if ( $width < $min_table_width )
$width = $min_table_width;
}
// Store our resolved width
$style->width = $width;
$cellmap = $this->_frame->get_cellmap();
// If the whole table fits on the page, then assign each column it's max width
if ( $width == $max_width ) {
foreach (array_keys($columns) as $i)
$cellmap->set_column_width($i, $columns[$i]["max-width"]);
return;
}
// Determine leftover and assign it evenly to all columns
if ( $width > $min_width ) {
// We have four cases to deal with:
//
// 1. All columns are auto--no widths have been specified. In this
// case we distribute extra space across all columns weighted by max-width.
//
// 2. Only absolute widths have been specified. In this case we
// distribute any extra space equally among 'width: auto' columns.
//
// 3. Only percentage widths have been specified. In this case we
// normalize the percentage values and distribute any remaining % to
// width: auto columns. We then proceed to assign widths as fractions
// of the table width.
//
// 4. Both absolute and percentage widths have been specified. This
// is annoying.
// Case 1:
if ( $absolute_used == 0 && $percent_used == 0 ) {
$increment = $width - $min_width;
foreach (array_keys($columns) as $i)
$cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment * ($columns[$i]["max-width"] / $max_width));
return;
}
// Case 2
if ( $absolute_used > 0 && $percent_used == 0 ) {
if ( count($auto) > 0 )
$increment = ($width - $auto_min - $absolute_used) / count($auto);
else
$increment = 0;
// Use the absolutely specified width or the increment
foreach (array_keys($columns) as $i) {
if ( $columns[$i]["absolute"] > 0 )
$cellmap->set_column_width($i, $columns[$i]["min-width"]);
else
$cellmap->set_column_width($i,$columns[$i]["min-width"] + $increment);
}
return;
}
// Case 3:
if ( $absolute_used == 0 && $percent_used > 0 ) {
$scale = null;
$remaining = null;
// Scale percent values if the total percentage is > 100, or if all
// values are specified as percentages.
if ( $percent_used > 100 || count($auto) == 0)
$scale = 100 / $percent_used;
else
$scale = 1;
// Account for the minimum space used by the unassigned auto columns
$used_width = $auto_min;
foreach ($percent as $i) {
$columns[$i]["percent"] *= $scale;
$slack = $width - $used_width;
$w = min($columns[$i]["percent"] * $width/100, $slack);
if ( $w < $columns[$i]["min-width"] )
$w = $columns[$i]["min-width"];
$cellmap->set_column_width($i, $w);
$used_width += $w;
}
// This works because $used_width includes the min-width of each
// unassigned column
if ( count($auto) > 0 ) {
$increment = ($width - $used_width) / count($auto);
foreach ($auto as $i)
$cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment);
}
return;
}
// Case 4:
// First-come, first served
if ( $absolute_used > 0 && $percent_used > 0 ) {
$used_width = $auto_min;
foreach ($absolute as $i) {
$cellmap->set_column_width($i, $columns[$i]["min-width"]);
$used_width += $columns[$i]["min-width"];
}
// Scale percent values if the total percentage is > 100 or there
// are no auto values to take up slack
if ( $percent_used > 100 || count($auto) == 0 )
$scale = 100 / $percent_used;
else
$scale = 1;
$remaining_width = $width - $used_width;
foreach ($percent as $i) {
$slack = $remaining_width - $used_width;
$columns[$i]["percent"] *= $scale;
$w = min($columns[$i]["percent"] * $remaining_width / 100, $slack);
if ( $w < $columns[$i]["min-width"] )
$w = $columns[$i]["min-width"];
$columns[$i]["used-width"] = $w;
$used_width += $w;
}
if ( count($auto) > 0 ) {
$increment = ($width - $used_width) / count($auto);
foreach ($auto as $i)
$cellmap->set_column_width($i, $columns[$i]["min-width"] + $increment);
}
return;
}
} else { // we are over constrained
// Each column gets its minimum width
foreach (array_keys($columns) as $i)
$cellmap->set_column_width($i, $columns[$i]["min-width"]);
}
}
//........................................................................
// Determine the frame's height based on min/max height
protected function _calculate_height() {
$style = $this->_frame->get_style();
$height = $style->height;
$cellmap = $this->_frame->get_cellmap();
$cellmap->assign_frame_heights();
$rows = $cellmap->get_rows();
// Determine our content height
$content_height = 0;
foreach ( $rows as $r )
$content_height += $r["height"];
$cb = $this->_frame->get_containing_block();
if ( !($style->overflow === "visible" ||
($style->overflow === "hidden" && $height === "auto")) ) {
// Only handle min/max height if the height is independent of the frame's content
$min_height = $style->min_height;
$max_height = $style->max_height;
if ( isset($cb["h"]) ) {
$min_height = $style->length_in_pt($min_height, $cb["h"]);
$max_height = $style->length_in_pt($max_height, $cb["h"]);
} else if ( isset($cb["w"]) ) {
if ( mb_strpos($min_height, "%") !== false )
$min_height = 0;
else
$min_height = $style->length_in_pt($min_height, $cb["w"]);
if ( mb_strpos($max_height, "%") !== false )
$max_height = "none";
else
$max_height = $style->length_in_pt($max_height, $cb["w"]);
}
if ( $max_height !== "none" && $min_height > $max_height )
// Swap 'em
list($max_height, $min_height) = array($min_height, $max_height);
if ( $max_height !== "none" && $height > $max_height )
$height = $max_height;
if ( $height < $min_height )
$height = $min_height;
} else {
// Use the content height or the height value, whichever is greater
if ( $height !== "auto" ) {
$height = $style->length_in_pt($height, $cb["h"]);
if ( $height <= $content_height )
$height = $content_height;
else
$cellmap->set_frame_heights($height,$content_height);
} else
$height = $content_height;
}
return $height;
}
//........................................................................
function reflow() {
// Check if a page break is forced
$page = $this->_frame->get_root();
$page->check_forced_page_break($this->_frame);
// Bail if the page is full
if ( $page->is_full() )
return;
// Let the page know that we're reflowing a table so that splits
// are suppressed (simply setting page-break-inside: avoid won't
// work because we may have an arbitrary number of block elements
// inside tds.)
$page->table_reflow_start();
// Collapse vertical margins, if required
$this->_collapse_margins();
$this->_frame->position();
// Table layout algorithm:
// http://www.w3.org/TR/CSS21/tables.html#auto-table-layout
if ( is_null($this->_state) )
$this->get_min_max_width();
$cb = $this->_frame->get_containing_block();
$style = $this->_frame->get_style();
// This is slightly inexact, but should be okay. Add half the
// border-spacing to the table as padding. The other half is added to
// the cells themselves.
if ( $style->border_collapse === "separate" ) {
list($h, $v) = $style->border_spacing;
$v = $style->length_in_pt($v) / 2;
$h = $style->length_in_pt($h) / 2;
$style->padding_left = $style->length_in_pt($style->padding_left, $cb["w"]) + $h;
$style->padding_right = $style->length_in_pt($style->padding_right, $cb["w"]) + $h;
$style->padding_top = $style->length_in_pt($style->padding_top, $cb["w"]) + $v;
$style->padding_bottom = $style->length_in_pt($style->padding_bottom, $cb["w"]) + $v;
}
$this->_assign_widths();
// Adjust left & right margins, if they are auto
$width = $style->width;
$left = $style->margin_left;
$right = $style->margin_right;
$diff = $cb["w"] - $width;
if ( $left === "auto" && $right === "auto" && $diff > 0 ) {
$left = $right = $diff / 2;
$style->margin_left = "$left pt";
$style->margin_right = "$right pt";
} else {
$left = $style->length_in_pt($left, $cb["w"]);
$right = $style->length_in_pt($right, $cb["w"]);
}
list($x, $y) = $this->_frame->get_position();
// Determine the content edge
$content_x = $x + $left + $style->length_in_pt(array($style->padding_left,
$style->border_left_width), $cb["w"]);
$content_y = $y + $style->length_in_pt(array($style->margin_top,
$style->border_top_width,
$style->padding_top), $cb["w"]);
if ( isset($cb["h"]) )
$h = $cb["h"];
else
$h = null;
$cellmap = $this->_frame->get_cellmap();
$col =& $cellmap->get_column(0);
$col["x"] = $content_x;
$row =& $cellmap->get_row(0);
$row["y"] = $content_y;
$cellmap->assign_x_positions();
// Set the containing block of each child & reflow
foreach ( $this->_frame->get_children() as $child ) {
// Bail if the page is full
if ( $page->is_full() )
break;
$child->set_containing_block($content_x, $content_y, $width, $h);
$child->reflow();
// Check if a split has occured
$page->check_page_break($child);
}
// Assign heights to our cells:
$style->height = $this->_calculate_height();
if ( $style->border_collapse === "collapse" ) {
// Unset our borders because our cells are now using them
$style->border_style = "none";
}
$page->table_reflow_end();
// Debugging:
//echo ($this->_frame->get_cellmap());
}
//........................................................................
function get_min_max_width() {
$style = $this->_frame->get_style();
$this->_frame->normalise();
// Add the cells to the cellmap (this will calcluate column widths as
// frames are added)
$this->_frame->get_cellmap()->add_frame($this->_frame);
// Find the min/max width of the table and sort the columns into
// absolute/percent/auto arrays
$this->_state = array();
$this->_state["min_width"] = 0;
$this->_state["max_width"] = 0;
$this->_state["percent_used"] = 0;
$this->_state["absolute_used"] = 0;
$this->_state["auto_min"] = 0;
$this->_state["absolute"] = array();
$this->_state["percent"] = array();
$this->_state["auto"] = array();
$columns =& $this->_frame->get_cellmap()->get_columns();
foreach (array_keys($columns) as $i) {
$this->_state["min_width"] += $columns[$i]["min-width"];
$this->_state["max_width"] += $columns[$i]["max-width"];
if ( $columns[$i]["absolute"] > 0 ) {
$this->_state["absolute"][] = $i;
$this->_state["absolute_used"] += $columns[$i]["absolute"];
} else if ( $columns[$i]["percent"] > 0 ) {
$this->_state["percent"][] = $i;
$this->_state["percent_used"] += $columns[$i]["percent"];
} else {
$this->_state["auto"][] = $i;
$this->_state["auto_min"] += $columns[$i]["min-width"];
}
}
return array($this->_state["min_width"], $this->_state["max_width"],
"min" => $this->_state["min_width"], "max" => $this->_state["max_width"]);
}
}
?>