806 lines
23 KiB
PHP
806 lines
23 KiB
PHP
<?php
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/**
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* @package dompdf
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* @link http://dompdf.github.com/
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* @author Benj Carson <benjcarson@digitaljunkies.ca>
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* @author Fabien Ménager <fabien.menager@gmail.com>
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* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
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*/
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/**
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* Reflows block frames
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*
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* @access private
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* @package dompdf
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*/
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class Block_Frame_Reflower extends Frame_Reflower {
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// Minimum line width to justify, as fraction of available width
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const MIN_JUSTIFY_WIDTH = 0.80;
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/**
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* @var Block_Frame_Decorator
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*/
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protected $_frame;
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function __construct(Block_Frame_Decorator $frame) { parent::__construct($frame); }
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/**
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* Calculate the ideal used value for the width property as per:
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* http://www.w3.org/TR/CSS21/visudet.html#Computing_widths_and_margins
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*
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* @param float $width
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* @return array
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*/
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protected function _calculate_width($width) {
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$frame = $this->_frame;
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$style = $frame->get_style();
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$w = $frame->get_containing_block("w");
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if ( $style->position === "fixed" ) {
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$w = $frame->get_parent()->get_containing_block("w");
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}
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$rm = $style->length_in_pt($style->margin_right, $w);
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$lm = $style->length_in_pt($style->margin_left, $w);
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$left = $style->length_in_pt($style->left, $w);
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$right = $style->length_in_pt($style->right, $w);
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// Handle 'auto' values
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$dims = array($style->border_left_width,
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$style->border_right_width,
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$style->padding_left,
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$style->padding_right,
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$width !== "auto" ? $width : 0,
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$rm !== "auto" ? $rm : 0,
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$lm !== "auto" ? $lm : 0);
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// absolutely positioned boxes take the 'left' and 'right' properties into account
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if ( $frame->is_absolute() ) {
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$absolute = true;
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$dims[] = $left !== "auto" ? $left : 0;
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$dims[] = $right !== "auto" ? $right : 0;
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}
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else {
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$absolute = false;
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}
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$sum = $style->length_in_pt($dims, $w);
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// Compare to the containing block
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$diff = $w - $sum;
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if ( $diff > 0 ) {
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if ( $absolute ) {
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// resolve auto properties: see
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// http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width
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if ( $width === "auto" && $left === "auto" && $right === "auto" ) {
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if ( $lm === "auto" ) $lm = 0;
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if ( $rm === "auto" ) $rm = 0;
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// Technically, the width should be "shrink-to-fit" i.e. based on the
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// preferred width of the content... a little too costly here as a
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// special case. Just get the width to take up the slack:
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$left = 0;
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$right = 0;
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$width = $diff;
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}
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else if ( $width === "auto" ) {
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if ( $lm === "auto" ) $lm = 0;
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if ( $rm === "auto" ) $rm = 0;
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if ( $left === "auto" ) $left = 0;
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if ( $right === "auto" ) $right = 0;
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$width = $diff;
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}
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else if ( $left === "auto" ) {
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if ( $lm === "auto" ) $lm = 0;
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if ( $rm === "auto" ) $rm = 0;
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if ( $right === "auto" ) $right = 0;
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$left = $diff;
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}
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else if ( $right === "auto" ) {
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if ( $lm === "auto" ) $lm = 0;
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if ( $rm === "auto" ) $rm = 0;
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$right = $diff;
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}
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}
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else {
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// Find auto properties and get them to take up the slack
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if ( $width === "auto" ) {
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$width = $diff;
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}
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else if ( $lm === "auto" && $rm === "auto" ) {
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$lm = $rm = round($diff / 2);
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}
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else if ( $lm === "auto" ) {
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$lm = $diff;
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}
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else if ( $rm === "auto" ) {
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$rm = $diff;
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}
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}
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}
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else if ($diff < 0) {
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// We are over constrained--set margin-right to the difference
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$rm = $diff;
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}
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return array(
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"width" => $width,
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"margin_left" => $lm,
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"margin_right" => $rm,
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"left" => $left,
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"right" => $right,
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);
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}
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/**
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* Call the above function, but resolve max/min widths
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*
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* @throws DOMPDF_Exception
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* @return array
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*/
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protected function _calculate_restricted_width() {
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$frame = $this->_frame;
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$style = $frame->get_style();
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$cb = $frame->get_containing_block();
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if ( $style->position === "fixed" ) {
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$cb = $frame->get_root()->get_containing_block();
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}
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//if ( $style->position === "absolute" )
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// $cb = $frame->find_positionned_parent()->get_containing_block();
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if ( !isset($cb["w"]) ) {
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throw new DOMPDF_Exception("Box property calculation requires containing block width");
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}
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// Treat width 100% as auto
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if ( $style->width === "100%" ) {
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$width = "auto";
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}
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else {
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$width = $style->length_in_pt($style->width, $cb["w"]);
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}
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extract($this->_calculate_width($width));
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// Handle min/max width
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$min_width = $style->length_in_pt($style->min_width, $cb["w"]);
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$max_width = $style->length_in_pt($style->max_width, $cb["w"]);
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if ( $max_width !== "none" && $min_width > $max_width ) {
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list($max_width, $min_width) = array($min_width, $max_width);
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}
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if ( $max_width !== "none" && $width > $max_width ) {
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extract($this->_calculate_width($max_width));
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}
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if ( $width < $min_width ) {
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extract($this->_calculate_width($min_width));
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}
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return array($width, $margin_left, $margin_right, $left, $right);
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}
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/**
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* Determine the unrestricted height of content within the block
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* not by adding each line's height, but by getting the last line's position.
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* This because lines could have been pushed lower by a clearing element.
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*
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* @return float
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*/
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protected function _calculate_content_height() {
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$lines = $this->_frame->get_line_boxes();
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$height = 0;
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foreach ($lines as $line) {
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$height += $line->h;
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}
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/*
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$first_line = reset($lines);
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$last_line = end($lines);
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$height2 = $last_line->y + $last_line->h - $first_line->y;
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*/
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return $height;
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}
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/**
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* Determine the frame's restricted height
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*
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* @return array
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*/
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protected function _calculate_restricted_height() {
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$frame = $this->_frame;
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$style = $frame->get_style();
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$content_height = $this->_calculate_content_height();
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$cb = $frame->get_containing_block();
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$height = $style->length_in_pt($style->height, $cb["h"]);
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$top = $style->length_in_pt($style->top, $cb["h"]);
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$bottom = $style->length_in_pt($style->bottom, $cb["h"]);
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$margin_top = $style->length_in_pt($style->margin_top, $cb["h"]);
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$margin_bottom = $style->length_in_pt($style->margin_bottom, $cb["h"]);
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if ( $frame->is_absolute() ) {
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// see http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height
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$dims = array($top !== "auto" ? $top : 0,
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$style->margin_top !== "auto" ? $style->margin_top : 0,
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$style->padding_top,
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$style->border_top_width,
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$height !== "auto" ? $height : 0,
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$style->border_bottom_width,
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$style->padding_bottom,
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$style->margin_bottom !== "auto" ? $style->margin_bottom : 0,
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$bottom !== "auto" ? $bottom : 0);
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$sum = $style->length_in_pt($dims, $cb["h"]);
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$diff = $cb["h"] - $sum;
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if ( $diff > 0 ) {
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if ( $height === "auto" && $top === "auto" && $bottom === "auto" ) {
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if ( $margin_top === "auto" ) $margin_top = 0;
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if ( $margin_bottom === "auto" ) $margin_bottom = 0;
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$height = $diff;
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}
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else if ( $height === "auto" && $top === "auto" ) {
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if ( $margin_top === "auto" ) $margin_top = 0;
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if ( $margin_bottom === "auto" ) $margin_bottom = 0;
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$height = $content_height;
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$top = $diff - $content_height;
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}
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else if ( $height === "auto" && $bottom === "auto" ) {
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if ( $margin_top === "auto" ) $margin_top = 0;
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if ( $margin_bottom === "auto" ) $margin_bottom = 0;
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$height = $content_height;
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$bottom = $diff - $content_height;
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}
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else if ( $top === "auto" && $bottom === "auto" ) {
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if ( $margin_top === "auto" ) $margin_top = 0;
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if ( $margin_bottom === "auto" ) $margin_bottom = 0;
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$bottom = $diff;
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}
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else if ( $top === "auto" ) {
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if ( $margin_top === "auto" ) $margin_top = 0;
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if ( $margin_bottom === "auto" ) $margin_bottom = 0;
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$top = $diff;
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}
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else if ( $height === "auto" ) {
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if ( $margin_top === "auto" ) $margin_top = 0;
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if ( $margin_bottom === "auto" ) $margin_bottom = 0;
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$height = $diff;
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}
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else if ( $bottom === "auto" ) {
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if ( $margin_top === "auto" ) $margin_top = 0;
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if ( $margin_bottom === "auto" ) $margin_bottom = 0;
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$bottom = $diff;
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}
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else {
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if ( $style->overflow === "visible" ) {
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// set all autos to zero
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if ( $margin_top === "auto" ) $margin_top = 0;
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if ( $margin_bottom === "auto" ) $margin_bottom = 0;
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if ( $top === "auto" ) $top = 0;
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if ( $bottom === "auto" ) $bottom = 0;
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if ( $height === "auto" ) $height = $content_height;
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}
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// FIXME: overflow hidden
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}
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}
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}
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else {
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// Expand the height if overflow is visible
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if ( $height === "auto" && $content_height > $height /* && $style->overflow === "visible" */) {
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$height = $content_height;
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}
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// FIXME: this should probably be moved to a seperate function as per
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// _calculate_restricted_width
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// Only handle min/max height if the height is independent of the frame's content
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if ( !($style->overflow === "visible" ||
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($style->overflow === "hidden" && $height === "auto")) ) {
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$min_height = $style->min_height;
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$max_height = $style->max_height;
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if ( isset($cb["h"]) ) {
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$min_height = $style->length_in_pt($min_height, $cb["h"]);
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$max_height = $style->length_in_pt($max_height, $cb["h"]);
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}
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else if ( isset($cb["w"]) ) {
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if ( mb_strpos($min_height, "%") !== false ) {
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$min_height = 0;
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}
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else {
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$min_height = $style->length_in_pt($min_height, $cb["w"]);
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}
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if ( mb_strpos($max_height, "%") !== false ) {
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$max_height = "none";
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}
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else {
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$max_height = $style->length_in_pt($max_height, $cb["w"]);
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}
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}
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if ( $max_height !== "none" && $min_height > $max_height ) {
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// Swap 'em
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list($max_height, $min_height) = array($min_height, $max_height);
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}
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if ( $max_height !== "none" && $height > $max_height ) {
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$height = $max_height;
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}
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if ( $height < $min_height ) {
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$height = $min_height;
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}
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}
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}
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return array($height, $margin_top, $margin_bottom, $top, $bottom);
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}
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/**
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* Adjust the justification of each of our lines.
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* http://www.w3.org/TR/CSS21/text.html#propdef-text-align
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*/
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protected function _text_align() {
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$style = $this->_frame->get_style();
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$w = $this->_frame->get_containing_block("w");
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$width = $style->length_in_pt($style->width, $w);
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switch ($style->text_align) {
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default:
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case "left":
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foreach ($this->_frame->get_line_boxes() as $line) {
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if ( !$line->left ) {
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continue;
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}
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foreach($line->get_frames() as $frame) {
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if ( $frame instanceof Block_Frame_Decorator) {
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continue;
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}
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$frame->set_position( $frame->get_position("x") + $line->left );
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}
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}
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return;
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case "right":
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foreach ($this->_frame->get_line_boxes() as $line) {
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// Move each child over by $dx
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$dx = $width - $line->w - $line->right;
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foreach($line->get_frames() as $frame) {
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// Block frames are not aligned by text-align
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if ($frame instanceof Block_Frame_Decorator) {
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continue;
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}
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$frame->set_position( $frame->get_position("x") + $dx );
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}
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}
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break;
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case "justify":
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// We justify all lines except the last one
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$lines = $this->_frame->get_line_boxes(); // needs to be a variable (strict standards)
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array_pop($lines);
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foreach($lines as $i => $line) {
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if ( $line->br ) {
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unset($lines[$i]);
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}
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}
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// One space character's width. Will be used to get a more accurate spacing
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$space_width = Font_Metrics::get_text_width(" ", $style->font_family, $style->font_size);
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foreach ($lines as $line) {
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if ( $line->left ) {
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foreach ( $line->get_frames() as $frame ) {
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if ( !$frame instanceof Text_Frame_Decorator ) {
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continue;
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}
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$frame->set_position( $frame->get_position("x") + $line->left );
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}
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}
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// Only set the spacing if the line is long enough. This is really
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// just an aesthetic choice ;)
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//if ( $line["left"] + $line["w"] + $line["right"] > self::MIN_JUSTIFY_WIDTH * $width ) {
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// Set the spacing for each child
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if ( $line->wc > 1 ) {
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$spacing = ($width - ($line->left + $line->w + $line->right) + $space_width) / ($line->wc - 1);
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}
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else {
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$spacing = 0;
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}
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$dx = 0;
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foreach($line->get_frames() as $frame) {
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if ( !$frame instanceof Text_Frame_Decorator ) {
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continue;
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}
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$text = $frame->get_text();
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$spaces = mb_substr_count($text, " ");
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$char_spacing = $style->length_in_pt($style->letter_spacing);
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$_spacing = $spacing + $char_spacing;
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$frame->set_position( $frame->get_position("x") + $dx );
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$frame->set_text_spacing($_spacing);
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$dx += $spaces * $_spacing;
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}
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// The line (should) now occupy the entire width
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$line->w = $width;
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//}
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}
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break;
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case "center":
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case "centre":
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foreach ($this->_frame->get_line_boxes() as $line) {
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// Centre each line by moving each frame in the line by:
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$dx = ($width + $line->left - $line->w - $line->right ) / 2;
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foreach ($line->get_frames() as $frame) {
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// Block frames are not aligned by text-align
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if ($frame instanceof Block_Frame_Decorator) {
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continue;
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}
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$frame->set_position( $frame->get_position("x") + $dx );
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}
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}
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break;
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}
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}
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/**
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* Align inline children vertically.
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* Aligns each child vertically after each line is reflowed
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*/
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function vertical_align() {
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$canvas = null;
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foreach ( $this->_frame->get_line_boxes() as $line ) {
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$height = $line->h;
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foreach ( $line->get_frames() as $frame ) {
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$style = $frame->get_style();
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if ( $style->display !== "inline" ) {
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continue;
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}
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$align = $frame->get_parent()->get_style()->vertical_align;
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if ( !isset($canvas) ) {
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$canvas = $frame->get_root()->get_dompdf()->get_canvas();
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}
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$baseline = $canvas->get_font_baseline($style->font_family, $style->font_size);
|
|
$y_offset = 0;
|
|
|
|
switch ($align) {
|
|
case "baseline":
|
|
$y_offset = $height*0.8 - $baseline; // The 0.8 ratio is arbitrary until we find it's meaning
|
|
break;
|
|
|
|
case "middle":
|
|
$y_offset = ($height*0.8 - $baseline) / 2;
|
|
break;
|
|
|
|
case "sub":
|
|
$y_offset = 0.3 * $height;
|
|
break;
|
|
|
|
case "super":
|
|
$y_offset = -0.2 * $height;
|
|
break;
|
|
|
|
case "text-top":
|
|
case "top": // Not strictly accurate, but good enough for now
|
|
break;
|
|
|
|
case "text-bottom":
|
|
case "bottom":
|
|
$y_offset = $height*0.8 - $baseline;
|
|
break;
|
|
}
|
|
|
|
if ( $y_offset ) {
|
|
$frame->move(0, $y_offset);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param Frame $child
|
|
*/
|
|
function process_clear(Frame $child){
|
|
$enable_css_float = $this->get_dompdf()->get_option("enable_css_float");
|
|
if ( !$enable_css_float ) {
|
|
return;
|
|
}
|
|
|
|
$child_style = $child->get_style();
|
|
$root = $this->_frame->get_root();
|
|
|
|
// Handle "clear"
|
|
if ( $child_style->clear !== "none" ) {
|
|
$lowest_y = $root->get_lowest_float_offset($child);
|
|
|
|
// If a float is still applying, we handle it
|
|
if ( $lowest_y ) {
|
|
if ( $child->is_in_flow() ) {
|
|
$line_box = $this->_frame->get_current_line_box();
|
|
$line_box->y = $lowest_y + $child->get_margin_height();
|
|
$line_box->left = 0;
|
|
$line_box->right = 0;
|
|
}
|
|
|
|
$child->move(0, $lowest_y - $child->get_position("y"));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param Frame $child
|
|
* @param float $cb_x
|
|
* @param float $cb_w
|
|
*/
|
|
function process_float(Frame $child, $cb_x, $cb_w){
|
|
$enable_css_float = $this->_frame->get_dompdf()->get_option("enable_css_float");
|
|
if ( !$enable_css_float ) {
|
|
return;
|
|
}
|
|
|
|
$child_style = $child->get_style();
|
|
$root = $this->_frame->get_root();
|
|
|
|
// Handle "float"
|
|
if ( $child_style->float !== "none" ) {
|
|
$root->add_floating_frame($child);
|
|
|
|
// Remove next frame's beginning whitespace
|
|
$next = $child->get_next_sibling();
|
|
if ( $next && $next instanceof Text_Frame_Decorator) {
|
|
$next->set_text(ltrim($next->get_text()));
|
|
}
|
|
|
|
$line_box = $this->_frame->get_current_line_box();
|
|
list($old_x, $old_y) = $child->get_position();
|
|
|
|
$float_x = $cb_x;
|
|
$float_y = $old_y;
|
|
$float_w = $child->get_margin_width();
|
|
|
|
if ( $child_style->clear === "none" ) {
|
|
switch( $child_style->float ) {
|
|
case "left":
|
|
$float_x += $line_box->left;
|
|
break;
|
|
case "right":
|
|
$float_x += ($cb_w - $line_box->right - $float_w);
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
if ( $child_style->float === "right" ) {
|
|
$float_x += ($cb_w - $float_w);
|
|
}
|
|
}
|
|
|
|
if ( $cb_w < $float_x + $float_w - $old_x ) {
|
|
// TODO handle when floating elements don't fit
|
|
}
|
|
|
|
$line_box->get_float_offsets();
|
|
|
|
if ( $child->_float_next_line ) {
|
|
$float_y += $line_box->h;
|
|
}
|
|
|
|
$child->set_position($float_x, $float_y);
|
|
$child->move($float_x - $old_x, $float_y - $old_y, true);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param Frame_Decorator $block
|
|
*/
|
|
function reflow(Block_Frame_Decorator $block = null) {
|
|
|
|
// 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;
|
|
}
|
|
|
|
// Generated content
|
|
$this->_set_content();
|
|
|
|
// Collapse margins if required
|
|
$this->_collapse_margins();
|
|
|
|
$style = $this->_frame->get_style();
|
|
$cb = $this->_frame->get_containing_block();
|
|
|
|
if ( $style->position === "fixed" ) {
|
|
$cb = $this->_frame->get_root()->get_containing_block();
|
|
}
|
|
|
|
// Determine the constraints imposed by this frame: calculate the width
|
|
// of the content area:
|
|
list($w, $left_margin, $right_margin, $left, $right) = $this->_calculate_restricted_width();
|
|
|
|
// Store the calculated properties
|
|
$style->width = $w . "pt";
|
|
$style->margin_left = $left_margin."pt";
|
|
$style->margin_right = $right_margin."pt";
|
|
$style->left = $left ."pt";
|
|
$style->right = $right . "pt";
|
|
|
|
// Update the position
|
|
$this->_frame->position();
|
|
list($x, $y) = $this->_frame->get_position();
|
|
|
|
// Adjust the first line based on the text-indent property
|
|
$indent = $style->length_in_pt($style->text_indent, $cb["w"]);
|
|
$this->_frame->increase_line_width($indent);
|
|
|
|
// Determine the content edge
|
|
$top = $style->length_in_pt(array($style->margin_top,
|
|
$style->padding_top,
|
|
$style->border_top_width), $cb["h"]);
|
|
|
|
$bottom = $style->length_in_pt(array($style->border_bottom_width,
|
|
$style->margin_bottom,
|
|
$style->padding_bottom), $cb["h"]);
|
|
|
|
$cb_x = $x + $left_margin + $style->length_in_pt(array($style->border_left_width,
|
|
$style->padding_left), $cb["w"]);
|
|
|
|
$cb_y = $y + $top;
|
|
|
|
$cb_h = ($cb["h"] + $cb["y"]) - $bottom - $cb_y;
|
|
|
|
// Set the y position of the first line in this block
|
|
$line_box = $this->_frame->get_current_line_box();
|
|
$line_box->y = $cb_y;
|
|
$line_box->get_float_offsets();
|
|
|
|
// Set the containing blocks and reflow each child
|
|
foreach ( $this->_frame->get_children() as $child ) {
|
|
|
|
// Bail out if the page is full
|
|
if ( $page->is_full() ) {
|
|
break;
|
|
}
|
|
|
|
$child->set_containing_block($cb_x, $cb_y, $w, $cb_h);
|
|
|
|
$this->process_clear($child);
|
|
|
|
$child->reflow($this->_frame);
|
|
|
|
// Don't add the child to the line if a page break has occurred
|
|
if ( $page->check_page_break($child) ) {
|
|
break;
|
|
}
|
|
|
|
$this->process_float($child, $cb_x, $w);
|
|
}
|
|
|
|
// Determine our height
|
|
list($height, $margin_top, $margin_bottom, $top, $bottom) = $this->_calculate_restricted_height();
|
|
$style->height = $height;
|
|
$style->margin_top = $margin_top;
|
|
$style->margin_bottom = $margin_bottom;
|
|
$style->top = $top;
|
|
$style->bottom = $bottom;
|
|
|
|
$needs_reposition = ($style->position === "absolute" && ($style->right !== "auto" || $style->bottom !== "auto"));
|
|
|
|
// Absolute positioning measurement
|
|
if ( $needs_reposition ) {
|
|
$orig_style = $this->_frame->get_original_style();
|
|
if ( $orig_style->width === "auto" && ($orig_style->left === "auto" || $orig_style->right === "auto") ) {
|
|
$width = 0;
|
|
foreach ($this->_frame->get_line_boxes() as $line) {
|
|
$width = max($line->w, $width);
|
|
}
|
|
$style->width = $width;
|
|
}
|
|
|
|
$style->left = $orig_style->left;
|
|
$style->right = $orig_style->right;
|
|
}
|
|
|
|
$this->_text_align();
|
|
$this->vertical_align();
|
|
|
|
// Absolute positioning
|
|
if ( $needs_reposition ) {
|
|
list($x, $y) = $this->_frame->get_position();
|
|
$this->_frame->position();
|
|
list($new_x, $new_y) = $this->_frame->get_position();
|
|
$this->_frame->move($new_x-$x, $new_y-$y, true);
|
|
}
|
|
|
|
if ( $block && $this->_frame->is_in_flow() ) {
|
|
$block->add_frame_to_line($this->_frame);
|
|
|
|
// May be inline-block
|
|
if ( $style->display === "block" ) {
|
|
$block->add_line();
|
|
}
|
|
}
|
|
}
|
|
}
|