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<?php
/**
* @package dompdf
* @link http://dompdf.github.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @author Fabien Ménager <fabien.menager@gmail.com>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace Dompdf\FrameReflower;
use Dompdf\Frame;
use Dompdf\FrameDecorator\Block as BlockFrameDecorator;
use Dompdf\FrameDecorator\TableCell as TableCellFrameDecorator;
use Dompdf\FrameDecorator\Text as TextFrameDecorator;
use Dompdf\Exception;
use Dompdf\Css\Style;
use Dompdf\Helpers;
/**
* Reflows block frames
*
* @package dompdf
*/
class Block extends AbstractFrameReflower
{
// Minimum line width to justify, as fraction of available width
const MIN_JUSTIFY_WIDTH = 0.80;
/**
* @var BlockFrameDecorator
*/
protected $_frame;
function __construct(BlockFrameDecorator $frame)
{
parent::__construct($frame);
}
/**
* Calculate the ideal used value for the width property as per:
* http://www.w3.org/TR/CSS21/visudet.html#Computing_widths_and_margins
*
* @param float $width
*
* @return array
*/
protected function _calculate_width($width)
{
$frame = $this->_frame;
$style = $frame->get_style();
$absolute = $frame->is_absolute();
$cb = $frame->get_containing_block();
$w = $cb["w"];
$rm = $style->length_in_pt($style->margin_right, $w);
$lm = $style->length_in_pt($style->margin_left, $w);
$left = $style->length_in_pt($style->left, $w);
$right = $style->length_in_pt($style->right, $w);
// Handle 'auto' values
$dims = [$style->border_left_width,
$style->border_right_width,
$style->padding_left,
$style->padding_right,
$width !== "auto" ? $width : 0,
$rm !== "auto" ? $rm : 0,
$lm !== "auto" ? $lm : 0];
// absolutely positioned boxes take the 'left' and 'right' properties into account
if ($absolute) {
$dims[] = $left !== "auto" ? $left : 0;
$dims[] = $right !== "auto" ? $right : 0;
}
$sum = (float)$style->length_in_pt($dims, $w);
// Compare to the containing block
$diff = $w - $sum;
if ($absolute) {
// Absolutely positioned
// http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width
if ($width === "auto" || $left === "auto" || $right === "auto") {
// "all of the three are 'auto'" logic + otherwise case
if ($lm === "auto") {
$lm = 0;
}
if ($rm === "auto") {
$rm = 0;
}
$block_parent = $frame->find_block_parent();
$parent_content = $block_parent->get_content_box();
$line = $block_parent->get_current_line_box();
// TODO: This is the in-flow inline position. Use the in-flow
// block position if the original display type is block-level
$inflow_x = $parent_content["x"] - $cb["x"] + $line->left + $line->w;
if ($width === "auto" && $left === "auto" && $right === "auto") {
// rule 3, per instruction preceding rule set
// shrink-to-fit width
$left = $inflow_x;
[$min, $max] = $this->get_min_max_child_width();
$width = min(max($min, $diff - $left), $max);
$right = $diff - $left - $width;
} elseif ($width === "auto" && $left === "auto") {
// rule 1
// shrink-to-fit width
[$min, $max] = $this->get_min_max_child_width();
$width = min(max($min, $diff), $max);
$left = $diff - $width;
} elseif ($width === "auto" && $right === "auto") {
// rule 3
// shrink-to-fit width
[$min, $max] = $this->get_min_max_child_width();
$width = min(max($min, $diff), $max);
$right = $diff - $width;
} elseif ($left === "auto" && $right === "auto") {
// rule 2
$left = $inflow_x;
$right = $diff - $left;
} elseif ($left === "auto") {
// rule 4
$left = $diff;
} elseif ($width === "auto") {
// rule 5
$width = max($diff, 0);
} else {
// $right === "auto"
// rule 6
$right = $diff;
}
} else {
// "none of the three are 'auto'" logic described in paragraph preceding the rules
if ($diff >= 0) {
if ($lm === "auto" && $rm === "auto") {
$lm = $rm = $diff / 2;
} elseif ($lm === "auto") {
$lm = $diff;
} elseif ($rm === "auto") {
$rm = $diff;
}
} else {
// over-constrained, solve for right
$right = $right + $diff;
if ($lm === "auto") {
$lm = 0;
}
if ($rm === "auto") {
$rm = 0;
}
}
}
} elseif ($style->float !== "none" || $style->display === "inline-block") {
// Shrink-to-fit width for float and inline block
// https://www.w3.org/TR/CSS21/visudet.html#float-width
// https://www.w3.org/TR/CSS21/visudet.html#inlineblock-width
if ($width === "auto") {
[$min, $max] = $this->get_min_max_child_width();
$width = min(max($min, $diff), $max);
}
if ($lm === "auto") {
$lm = 0;
}
if ($rm === "auto") {
$rm = 0;
}
} else {
// Block-level, normal flow
// https://www.w3.org/TR/CSS21/visudet.html#blockwidth
if ($diff >= 0) {
// Find auto properties and get them to take up the slack
if ($width === "auto") {
$width = $diff;
if ($lm === "auto") {
$lm = 0;
}
if ($rm === "auto") {
$rm = 0;
}
} elseif ($lm === "auto" && $rm === "auto") {
$lm = $rm = $diff / 2;
} elseif ($lm === "auto") {
$lm = $diff;
} elseif ($rm === "auto") {
$rm = $diff;
}
} else {
// We are over constrained--set margin-right to the difference
$rm = (float) $rm + $diff;
if ($width === "auto") {
$width = 0;
}
if ($lm === "auto") {
$lm = 0;
}
}
}
return [
"width" => $width,
"margin_left" => $lm,
"margin_right" => $rm,
"left" => $left,
"right" => $right,
];
}
/**
* Call the above function, but resolve max/min widths
*
* @throws Exception
* @return array
*/
protected function _calculate_restricted_width()
{
$frame = $this->_frame;
$style = $frame->get_style();
$cb = $frame->get_containing_block();
if (!isset($cb["w"])) {
throw new Exception("Box property calculation requires containing block width");
}
$width = $style->length_in_pt($style->width, $cb["w"]);
$values = $this->_calculate_width($width);
$margin_left = $values["margin_left"];
$margin_right = $values["margin_right"];
$width = $values["width"];
$left = $values["left"];
$right = $values["right"];
// Handle min/max width
// https://www.w3.org/TR/CSS21/visudet.html#min-max-widths
$min_width = $this->resolve_min_width($cb["w"]);
$max_width = $this->resolve_max_width($cb["w"]);
if ($width > $max_width) {
$values = $this->_calculate_width($max_width);
$margin_left = $values["margin_left"];
$margin_right = $values["margin_right"];
$width = $values["width"];
$left = $values["left"];
$right = $values["right"];
}
if ($width < $min_width) {
$values = $this->_calculate_width($min_width);
$margin_left = $values["margin_left"];
$margin_right = $values["margin_right"];
$width = $values["width"];
$left = $values["left"];
$right = $values["right"];
}
return [$width, $margin_left, $margin_right, $left, $right];
}
/**
* Determine the unrestricted height of content within the block
* not by adding each line's height, but by getting the last line's position.
* This because lines could have been pushed lower by a clearing element.
*
* @return float
*/
protected function _calculate_content_height()
{
$height = 0;
$lines = $this->_frame->get_line_boxes();
if (count($lines) > 0) {
$last_line = end($lines);
$content_box = $this->_frame->get_content_box();
$height = $last_line->y + $last_line->h - $content_box["y"];
}
return $height;
}
/**
* Determine the frame's restricted height
*
* @return array
*/
protected function _calculate_restricted_height()
{
$frame = $this->_frame;
$style = $frame->get_style();
$content_height = $this->_calculate_content_height();
$cb = $frame->get_containing_block();
$height = $style->length_in_pt($style->height, $cb["h"]);
$margin_top = $style->length_in_pt($style->margin_top, $cb["w"]);
$margin_bottom = $style->length_in_pt($style->margin_bottom, $cb["w"]);
$top = $style->length_in_pt($style->top, $cb["h"]);
$bottom = $style->length_in_pt($style->bottom, $cb["h"]);
if ($frame->is_absolute()) {
// Absolutely positioned
// http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height
$h_dims = [
$top !== "auto" ? $top : 0,
$height !== "auto" ? $height : 0,
$bottom !== "auto" ? $bottom : 0
];
$w_dims = [
$style->margin_top !== "auto" ? $style->margin_top : 0,
$style->padding_top,
$style->border_top_width,
$style->border_bottom_width,
$style->padding_bottom,
$style->margin_bottom !== "auto" ? $style->margin_bottom : 0
];
$sum = (float)$style->length_in_pt($h_dims, $cb["h"])
+ (float)$style->length_in_pt($w_dims, $cb["w"]);
$diff = $cb["h"] - $sum;
if ($height === "auto" || $top === "auto" || $bottom === "auto") {
// "all of the three are 'auto'" logic + otherwise case
if ($margin_top === "auto") {
$margin_top = 0;
}
if ($margin_bottom === "auto") {
$margin_bottom = 0;
}
$block_parent = $frame->find_block_parent();
$current_line = $block_parent->get_current_line_box();
// TODO: This is the in-flow inline position. Use the in-flow
// block position if the original display type is block-level
$inflow_y = $current_line->y - $cb["y"];
if ($height === "auto" && $top === "auto" && $bottom === "auto") {
// rule 3, per instruction preceding rule set
$top = $inflow_y;
$height = $content_height;
$bottom = $diff - $top - $height;
} elseif ($height === "auto" && $top === "auto") {
// rule 1
$height = $content_height;
$top = $diff - $height;
} elseif ($height === "auto" && $bottom === "auto") {
// rule 3
$height = $content_height;
$bottom = $diff - $height;
} elseif ($top === "auto" && $bottom === "auto") {
// rule 2
$top = $inflow_y;
$bottom = $diff - $top;
} elseif ($top === "auto") {
// rule 4
$top = $diff;
} elseif ($height === "auto") {
// rule 5
$height = max($diff, 0);
} else {
// $bottom === "auto"
// rule 6
$bottom = $diff;
}
} else {
// "none of the three are 'auto'" logic described in paragraph preceding the rules
if ($diff >= 0) {
if ($margin_top === "auto" && $margin_bottom === "auto") {
$margin_top = $margin_bottom = $diff / 2;
} elseif ($margin_top === "auto") {
$margin_top = $diff;
} elseif ($margin_bottom === "auto") {
$margin_bottom = $diff;
}
} else {
// over-constrained, solve for bottom
$bottom = $bottom + $diff;
if ($margin_top === "auto") {
$margin_top = 0;
}
if ($margin_bottom === "auto") {
$margin_bottom = 0;
}
}
}
} else {
// https://www.w3.org/TR/CSS21/visudet.html#normal-block
// https://www.w3.org/TR/CSS21/visudet.html#block-root-margin
if ($height === "auto") {
$height = $content_height;
}
if ($margin_top === "auto") {
$margin_top = 0;
}
if ($margin_bottom === "auto") {
$margin_bottom = 0;
}
// Handle min/max height
// https://www.w3.org/TR/CSS21/visudet.html#min-max-heights
$min_height = $this->resolve_min_height($cb["h"]);
$max_height = $this->resolve_max_height($cb["h"]);
$height = Helpers::clamp($height, $min_height, $max_height);
}
// TODO: Need to also take min/max height into account for absolute
// positioning, using similar logic to the `_calculate_width`/
// `calculate_restricted_width` split above. The non-absolute case
// can simply clamp height within min/max, as margins and offsets are
// not affected
return [$height, $margin_top, $margin_bottom, $top, $bottom];
}
/**
* Adjust the justification of each of our lines.
* http://www.w3.org/TR/CSS21/text.html#propdef-text-align
*/
protected function _text_align()
{
$style = $this->_frame->get_style();
$w = $this->_frame->get_containing_block("w");
$width = (float)$style->length_in_pt($style->width, $w);
$text_indent = (float)$style->length_in_pt($style->text_indent, $w);
switch ($style->text_align) {
default:
case "left":
foreach ($this->_frame->get_line_boxes() as $line) {
if (!$line->inline) {
continue;
}
$line->trim_trailing_ws();
if ($line->left) {
foreach ($line->frames_to_align() as $frame) {
$frame->move($line->left, 0);
}
}
}
break;
case "right":
foreach ($this->_frame->get_line_boxes() as $i => $line) {
if (!$line->inline) {
continue;
}
$line->trim_trailing_ws();
$indent = $i === 0 ? $text_indent : 0;
$dx = $width - $line->w - $line->right - $indent;
foreach ($line->frames_to_align() as $frame) {
$frame->move($dx, 0);
}
}
break;
case "justify":
// We justify all lines except the last one, unless the frame
// has been split, in which case the actual last line is part of
// the split-off frame
$lines = $this->_frame->get_line_boxes();
$last_line_index = $this->_frame->is_split ? null : count($lines) - 1;
foreach ($lines as $i => $line) {
if (!$line->inline) {
continue;
}
$line->trim_trailing_ws();
if ($line->left) {
foreach ($line->frames_to_align() as $frame) {
$frame->move($line->left, 0);
}
}
if ($line->br || $i === $last_line_index) {
continue;
}
$frames = $line->get_frames();
$other_frame_count = 0;
foreach ($frames as $frame) {
if (!($frame instanceof TextFrameDecorator)) {
$other_frame_count++;
}
}
$word_count = $line->wc + $other_frame_count;
// Set the spacing for each child
if ($word_count > 1) {
$indent = $i === 0 ? $text_indent : 0;
$spacing = ($width - $line->get_width() - $indent) / ($word_count - 1);
} else {
$spacing = 0;
}
$dx = 0;
foreach ($frames as $frame) {
if ($frame instanceof TextFrameDecorator) {
$text = $frame->get_text();
$spaces = mb_substr_count($text, " ");
$frame->move($dx, 0);
$frame->set_text_spacing($spacing);
$dx += $spaces * $spacing;
} else {
$frame->move($dx, 0);
}
}
// The line (should) now occupy the entire width
$line->w = $width;
}
break;
case "center":
case "centre":
foreach ($this->_frame->get_line_boxes() as $i => $line) {
if (!$line->inline) {
continue;
}
$line->trim_trailing_ws();
$indent = $i === 0 ? $text_indent : 0;
$dx = ($width + $line->left - $line->w - $line->right - $indent) / 2;
foreach ($line->frames_to_align() as $frame) {
$frame->move($dx, 0);
}
}
break;
}
}
/**
* Align inline children vertically.
* Aligns each child vertically after each line is reflowed
*/
function vertical_align()
{
$fontMetrics = $this->get_dompdf()->getFontMetrics();
foreach ($this->_frame->get_line_boxes() as $line) {
$height = $line->h;
// Move all markers to the top of the line box
foreach ($line->get_list_markers() as $marker) {
$x = $marker->get_position("x");
$marker->set_position($x, $line->y);
}
foreach ($line->frames_to_align() as $frame) {
$style = $frame->get_style();
$isInlineBlock = $style->display !== "inline"
&& $style->display !== "-dompdf-list-bullet";
$baseline = $fontMetrics->getFontBaseline($style->font_family, $style->font_size);
$y_offset = 0;
//FIXME: The 0.8 ratio applied to the height is arbitrary (used to accommodate descenders?)
if ($isInlineBlock) {
// Workaround: Skip vertical alignment if the frame is the
// only one one the line, excluding empty text frames, which
// may be the result of trailing white space
// FIXME: This special case should be removed once vertical
// alignment is properly fixed
$skip = true;
foreach ($line->get_frames() as $other) {
if ($other !== $frame
&& !($other->is_text_node() && $other->get_node()->nodeValue === "")
) {
$skip = false;
break;
}
}
if ($skip) {
continue;
}
$marginHeight = $frame->get_margin_height();
$imageHeightDiff = $height * 0.8 - $marginHeight;
$align = $frame->get_style()->vertical_align;
if (in_array($align, Style::$vertical_align_keywords, true)) {
switch ($align) {
case "middle":
$y_offset = $imageHeightDiff / 2;
break;
case "sub":
$y_offset = 0.3 * $height + $imageHeightDiff;
break;
case "super":
$y_offset = -0.2 * $height + $imageHeightDiff;
break;
case "text-top": // FIXME: this should be the height of the frame minus the height of the text
$y_offset = $height - $style->line_height;
break;
case "top":
break;
case "text-bottom": // FIXME: align bottom of image with the descender?
case "bottom":
$y_offset = 0.3 * $height + $imageHeightDiff;
break;
case "baseline":
default:
$y_offset = $imageHeightDiff;
break;
}
} else {
$y_offset = $baseline - (float)$style->length_in_pt($align, $style->font_size) - $marginHeight;
}
} else {
$parent = $frame->get_parent();
if ($parent instanceof TableCellFrameDecorator) {
$align = "baseline";
} else {
$align = $parent->get_style()->vertical_align;
}
if (in_array($align, Style::$vertical_align_keywords, true)) {
switch ($align) {
case "middle":
$y_offset = ($height * 0.8 - $baseline) / 2;
break;
case "sub":
$y_offset = $height * 0.8 - $baseline * 0.5;
break;
case "super":
$y_offset = $height * 0.8 - $baseline * 1.4;
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;
case "baseline":
default:
$y_offset = $height * 0.8 - $baseline;
break;
}
} else {
$y_offset = $height * 0.8 - $baseline - (float)$style->length_in_pt($align, $style->font_size);
}
}
if ($y_offset !== 0) {
$frame->move(0, $y_offset);
}
}
}
}
/**
* @param Frame $child
*/
function process_clear(Frame $child)
{
$child_style = $child->get_style();
$root = $this->_frame->get_root();
// Handle "clear"
if ($child_style->clear !== "none") {
//TODO: this is a WIP for handling clear/float frames that are in between inline frames
if ($child->get_prev_sibling() !== null) {
$this->_frame->add_line();
}
if ($child_style->float !== "none" && $child->get_next_sibling()) {
$this->_frame->set_current_line_number($this->_frame->get_current_line_number() - 1);
}
$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)
{
$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 TextFrameDecorator) {
$next->set_text(ltrim($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 BlockFrameDecorator $block
*/
function reflow(BlockFrameDecorator $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;
}
$this->determine_absolute_containing_block();
// Counters and generated content
$this->_set_content();
// Inherit any dangling list markers
if ($block && $this->_frame->is_in_flow()) {
$this->_frame->inherit_dangling_markers($block);
}
// Collapse margins if required
$this->_collapse_margins();
$style = $this->_frame->get_style();
$cb = $this->_frame->get_containing_block();
// Determine the constraints imposed by this frame: calculate the width
// of the content area:
list($width, $left_margin, $right_margin, $left, $right) = $this->_calculate_restricted_width();
// Store the calculated properties
$style->width = $width;
$style->margin_left = $left_margin;
$style->margin_right = $right_margin;
$style->left = $left;
$style->right = $right;
$margin_top = $style->length_in_pt($style->margin_top, $cb["w"]);
$margin_bottom = $style->length_in_pt($style->margin_bottom, $cb["w"]);
$auto_top = $style->top === "auto";
$auto_margin_top = $margin_top === "auto";
// Update the position
$this->_frame->position();
list($x, $y) = $this->_frame->get_position();
// Adjust the first line based on the text-indent property
$indent = (float)$style->length_in_pt($style->text_indent, $cb["w"]);
$this->_frame->increase_line_width($indent);
// Determine the content edge
$top = (float)$style->length_in_pt([
$margin_top !== "auto" ? $margin_top : 0,
$style->border_top_width,
$style->padding_top
], $cb["w"]);
$bottom = (float)$style->length_in_pt([
$margin_bottom !== "auto" ? $margin_bottom : 0,
$style->border_bottom_width,
$style->padding_bottom
], $cb["w"]);
$cb_x = $x + (float)$left_margin + (float)$style->length_in_pt([$style->border_left_width,
$style->padding_left], $cb["w"]);
$cb_y = $y + $top;
$height = $style->length_in_pt($style->height, $cb["h"]);
if ($height === "auto") {
$height = ($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) {
$child->set_containing_block($cb_x, $cb_y, $width, $height);
$this->process_clear($child);
$child->reflow($this->_frame);
// Check for a page break before the child
$page->check_page_break($child);
// Don't add the child to the line if a page break has occurred
// before it (possibly via a descendant), in which case it has been
// reset, including its position
if ($page->is_full() && $child->get_position("x") === null) {
break;
}
$this->process_float($child, $cb_x, $width);
}
// Stop reflow if a page break has occurred before the frame, in which
// case it has been reset, including its position
if ($page->is_full() && $this->_frame->get_position("x") === null) {
return;
}
// Determine our height
list($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 = $bottom;
if ($this->_frame->is_absolute()) {
if ($auto_top) {
$this->_frame->move(0, $top);
}
if ($auto_margin_top) {
$this->_frame->move(0, $margin_top, true);
}
}
$this->_text_align();
$this->vertical_align();
// Handle relative positioning
foreach ($this->_frame->get_children() as $child) {
$this->position_relative($child);
}
if ($block && $this->_frame->is_in_flow()) {
$block->add_frame_to_line($this->_frame);
if ($this->_frame->is_block_level()) {
$block->add_line();
}
}
}
public function get_min_max_content_width(): array
{
// TODO: While the containing block is not set yet on the frame, it can
// already be determined in some cases due to fixed dimensions on the
// ancestor forming the containing block. In such cases, percentage
// values could be resolved here
$style = $this->_frame->get_style();
$width = $style->width;
$fixed_width = $width !== "auto" && !Helpers::is_percent($width);
// If the frame has a specified width, then we don't need to check
// its children
if ($fixed_width) {
$min = (float) $style->length_in_pt($width, 0);
$max = $min;
} else {
[$min, $max] = $this->get_min_max_child_width();
}
// Handle min/max width style properties
$min_width = $this->resolve_min_width(null);
$max_width = $this->resolve_max_width(null);
$min = Helpers::clamp($min, $min_width, $max_width);
$max = Helpers::clamp($max, $min_width, $max_width);
return [$min, $max];
}
}