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<?php
/**
* DOMPDF - PHP5 HTML to PDF renderer
*
* File: $RCSfile: 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: frame_reflower.cls.php,v 1.5 2006/07/07 21:31:03 benjcarson Exp $ */
/**
* Base reflower class
*
* Reflower objects are responsible for determining the width and height of
* individual frames. The also create line and page breaks as necessary.
*
* @access private
* @package dompdf
*/
abstract class Frame_Reflower {
protected $_frame;
function __construct(Frame $frame) {
$this->_frame = $frame;
}
function dispose() {
unset($this->_frame);
}
protected function _collapse_margins() {
$cb = $this->_frame->get_containing_block();
$style = $this->_frame->get_style();
$t = $style->length_in_pt($style->margin_top, $cb["h"]);
$b = $style->length_in_pt($style->margin_bottom, $cb["w"]);
// Handle 'auto' values
if ( $t === "auto" ) {
$style->margin_top = "0pt";
$t = 0;
}
if ( $b === "auto" ) {
$style->margin_bottom = "0pt";
$b = 0;
}
// Collapse vertical margins:
$n = $this->_frame->get_next_sibling();
while ( $n && !in_array($n->get_style()->display, Style::$BLOCK_TYPES) )
$n = $n->get_next_sibling();
if ( $n ) { // && !$n instanceof Page_Frame_Decorator ) {
$b = max($b, $style->length_in_pt($n->get_style()->margin_top, $cb["w"]));
$n->get_style()->margin_top = "$b pt";
$style->margin_bottom = "0 pt";
}
// Collapse our first child's margin
$f = $this->_frame->get_first_child();
while ( $f && !in_array($f->get_style()->display, Style::$BLOCK_TYPES) )
$f = $f->get_next_sibling();
if ( $f ) {
$t = max( $t, $style->length_in_pt($f->get_style()->margin_top, $cb["w"]));
$style->margin_top = "$t pt";
$f->get_style()->margin_top = "0 pt";
}
}
// Returns true if a new page is required
protected function _check_new_page() {
$y = $this->_frame->get_position("y");
$h = $style->length_in_pt($style->height);
// Check if we need to move to a new page
if ( $y + $h >= $this->_frame->get_root()->get_page_height() )
return true;
}
//........................................................................
abstract function reflow();
//........................................................................
// Required for table layout: Returns an array(0 => min, 1 => max, "min"
// => min, "max" => max) of the minimum and maximum widths of this frame.
// This provides a basic implementation. Child classes should override
// this if necessary.
function get_min_max_width() {
$style = $this->_frame->get_style();
// Account for margins & padding
$dims = array($style->padding_left,
$style->padding_right,
$style->border_left_width,
$style->border_right_width,
$style->margin_left,
$style->margin_right);
$delta = $style->length_in_pt($dims, $this->_frame->get_containing_block("w"));
// Handle degenerate case
if ( !$this->_frame->get_first_child() )
return array($delta, $delta,"min" => $delta, "max" => $delta);
$low = array();
$high = array();
for ( $iter = $this->_frame->get_children()->getIterator();
$iter->valid();
$iter->next() ) {
$inline_min = 0;
$inline_max = 0;
// Add all adjacent inline widths together to calculate max width
while ( $iter->valid() && in_array( $iter->current()->get_style()->display, Style::$INLINE_TYPES ) ) {
$child = $iter->current();
$minmax = $child->get_min_max_width();
if ( in_array( $iter->current()->get_style()->white_space, array("pre", "nowrap") ) )
$inline_min += $minmax["min"];
else
$low[] = $minmax["min"];
$inline_max += $minmax["max"];
$iter->next();
}
if ( $inline_max == 0 && $iter->valid() ) {
list($low[], $high[]) = $iter->current()->get_min_max_width();
continue;
}
if ( $inline_max > 0 )
$high[] = $inline_max;
if ( $inline_min > 0 )
$low[] = $inline_min;
}
$min = count($low) ? max($low) : 0;
$max = count($high) ? max($high) : 0;
// Use specified width if it is greater than the minimum defined by the
// content. If the width is a percentage ignore it for now.
$width = $style->width;
if ( $width !== "auto" && !is_percent($width) ) {
$width = $style->length_in_pt($width, $width);
if ( $min < $width )
$min = $width;
}
$min += $delta;
$max += $delta;
return array($min, $max, "min"=>$min, "max"=>$max);
}
}
?>
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