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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\FontMetrics;
use Dompdf\Frame;
use Dompdf\FrameDecorator\Block as BlockFrameDecorator;
use Dompdf\FrameDecorator\Text as TextFrameDecorator;
use Dompdf\Exception;
/**
* 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();
$w = $frame->get_containing_block("w");
if ($style->position === "fixed") {
$w = $frame->get_parent()->get_containing_block("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
$dims = array($style->border_left_width,
$style->border_right_width,
$style->padding_left,
$style->padding_right,
$width !== "auto" ? $width : 0,
$rm !== "auto" ? $rm : 0,
$lm !== "auto" ? $lm : 0);
// absolutely positioned boxes take the 'left' and 'right' properties into account
if ($frame->is_absolute()) {
$absolute = true;
$dims[] = $left !== "auto" ? $left : 0;
$dims[] = $right !== "auto" ? $right : 0;
} else {
$absolute = false;
}
$sum = $style->length_in_pt($dims, $w);
// Compare to the containing block
$diff = $w - $sum;
if ($diff > 0) {
if ($absolute) {
// resolve auto properties: see
// http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width
if ($width === "auto" && $left === "auto" && $right === "auto") {
if ($lm === "auto") $lm = 0;
if ($rm === "auto") $rm = 0;
// Technically, the width should be "shrink-to-fit" i.e. based on the
// preferred width of the content... a little too costly here as a
// special case. Just get the width to take up the slack:
$left = 0;
$right = 0;
$width = $diff;
} else if ($width === "auto") {
if ($lm === "auto") $lm = 0;
if ($rm === "auto") $rm = 0;
if ($left === "auto") $left = 0;
if ($right === "auto") $right = 0;
$width = $diff;
} else if ($left === "auto") {
if ($lm === "auto") $lm = 0;
if ($rm === "auto") $rm = 0;
if ($right === "auto") $right = 0;
$left = $diff;
} else if ($right === "auto") {
if ($lm === "auto") $lm = 0;
if ($rm === "auto") $rm = 0;
$right = $diff;
}
} else {
// Find auto properties and get them to take up the slack
if ($width === "auto") {
$width = $diff;
} else if ($lm === "auto" && $rm === "auto") {
$lm = $rm = round($diff / 2);
} else if ($lm === "auto") {
$lm = $diff;
} else if ($rm === "auto") {
$rm = $diff;
}
}
} else if ($diff < 0) {
// We are over constrained--set margin-right to the difference
$rm = $diff;
}
return array(
"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 = $frame->get_containing_block();
if ($style->position === "fixed") {
$cb = $frame->get_root()->get_containing_block();
}
//if ( $style->position === "absolute" )
// $cb = $frame->find_positionned_parent()->get_containing_block();
if (!isset($cb["w"])) {
throw new Exception("Box property calculation requires containing block width");
}
// Treat width 100% as auto
if ($style->width === "100%") {
$width = "auto";
} else {
$width = $style->length_in_pt($style->width, $cb["w"]);
}
extract($this->_calculate_width($width));
// Handle min/max width
$min_width = $style->length_in_pt($style->min_width, $cb["w"]);
$max_width = $style->length_in_pt($style->max_width, $cb["w"]);
if ($max_width !== "none" && $min_width > $max_width) {
list($max_width, $min_width) = array($min_width, $max_width);
}
if ($max_width !== "none" && $width > $max_width) {
extract($this->_calculate_width($max_width));
}
if ($width < $min_width) {
extract($this->_calculate_width($min_width));
}
return array($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()
{
$lines = $this->_frame->get_line_boxes();
$height = 0;
foreach ($lines as $line) {
$height += $line->h;
}
/*
$first_line = reset($lines);
$last_line = end($lines);
$height2 = $last_line->y + $last_line->h - $first_line->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"]);
$top = $style->length_in_pt($style->top, $cb["h"]);
$bottom = $style->length_in_pt($style->bottom, $cb["h"]);
$margin_top = $style->length_in_pt($style->margin_top, $cb["h"]);
$margin_bottom = $style->length_in_pt($style->margin_bottom, $cb["h"]);
if ($frame->is_absolute()) {
// see http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height
$dims = array($top !== "auto" ? $top : 0,
$style->margin_top !== "auto" ? $style->margin_top : 0,
$style->padding_top,
$style->border_top_width,
$height !== "auto" ? $height : 0,
$style->border_bottom_width,
$style->padding_bottom,
$style->margin_bottom !== "auto" ? $style->margin_bottom : 0,
$bottom !== "auto" ? $bottom : 0);
$sum = $style->length_in_pt($dims, $cb["h"]);
$diff = $cb["h"] - $sum;
if ($diff > 0) {
if ($height === "auto" && $top === "auto" && $bottom === "auto") {
if ($margin_top === "auto") $margin_top = 0;
if ($margin_bottom === "auto") $margin_bottom = 0;
$height = $diff;
} else if ($height === "auto" && $top === "auto") {
if ($margin_top === "auto") $margin_top = 0;
if ($margin_bottom === "auto") $margin_bottom = 0;
$height = $content_height;
$top = $diff - $content_height;
} else if ($height === "auto" && $bottom === "auto") {
if ($margin_top === "auto") $margin_top = 0;
if ($margin_bottom === "auto") $margin_bottom = 0;
$height = $content_height;
$bottom = $diff - $content_height;
} else if ($top === "auto" && $bottom === "auto") {
if ($margin_top === "auto") $margin_top = 0;
if ($margin_bottom === "auto") $margin_bottom = 0;
$bottom = $diff;
} else if ($top === "auto") {
if ($margin_top === "auto") $margin_top = 0;
if ($margin_bottom === "auto") $margin_bottom = 0;
$top = $diff;
} else if ($height === "auto") {
if ($margin_top === "auto") $margin_top = 0;
if ($margin_bottom === "auto") $margin_bottom = 0;
$height = $diff;
} else if ($bottom === "auto") {
if ($margin_top === "auto") $margin_top = 0;
if ($margin_bottom === "auto") $margin_bottom = 0;
$bottom = $diff;
} else {
if ($style->overflow === "visible") {
// set all autos to zero
if ($margin_top === "auto") $margin_top = 0;
if ($margin_bottom === "auto") $margin_bottom = 0;
if ($top === "auto") $top = 0;
if ($bottom === "auto") $bottom = 0;
if ($height === "auto") $height = $content_height;
}
// FIXME: overflow hidden
}
}
} else {
// Expand the height if overflow is visible
if ($height === "auto" && $content_height > $height /* && $style->overflow === "visible" */) {
$height = $content_height;
}
// FIXME: this should probably be moved to a seperate function as per
// _calculate_restricted_width
// Only handle min/max height if the height is independent of the frame's content
if (!($style->overflow === "visible" ||
($style->overflow === "hidden" && $height === "auto"))
) {
$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 = $min_height;
}
}
}
return array($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 = $style->length_in_pt($style->width, $w);
switch ($style->text_align) {
default:
case "left":
foreach ($this->_frame->get_line_boxes() as $line) {
if (!$line->left) {
continue;
}
foreach ($line->get_frames() as $frame) {
if ($frame instanceof BlockFrameDecorator) {
continue;
}
$frame->set_position($frame->get_position("x") + $line->left);
}
}
return;
case "right":
foreach ($this->_frame->get_line_boxes() as $line) {
// Move each child over by $dx
$dx = $width - $line->w - $line->right;
foreach ($line->get_frames() as $frame) {
// Block frames are not aligned by text-align
if ($frame instanceof BlockFrameDecorator) {
continue;
}
$frame->set_position($frame->get_position("x") + $dx);
}
}
break;
case "justify":
// We justify all lines except the last one
$lines = $this->_frame->get_line_boxes(); // needs to be a variable (strict standards)
array_pop($lines);
foreach ($lines as $i => $line) {
if ($line->br) {
unset($lines[$i]);
}
}
// One space character's width. Will be used to get a more accurate spacing
$space_width = $this->get_dompdf()->getFontMetrics()->getTextWidth(" ", $style->font_family, $style->font_size);
foreach ($lines as $line) {
if ($line->left) {
foreach ($line->get_frames() as $frame) {
if (!$frame instanceof TextFrameDecorator) {
continue;
}
$frame->set_position($frame->get_position("x") + $line->left);
}
}
// Only set the spacing if the line is long enough. This is really
// just an aesthetic choice ;)
//if ( $line["left"] + $line["w"] + $line["right"] > self::MIN_JUSTIFY_WIDTH * $width ) {
// Set the spacing for each child
if ($line->wc > 1) {
$spacing = ($width - ($line->left + $line->w + $line->right) + $space_width) / ($line->wc - 1);
} else {
$spacing = 0;
}
$dx = 0;
foreach ($line->get_frames() as $frame) {
if (!$frame instanceof TextFrameDecorator) {
continue;
}
$text = $frame->get_text();
$spaces = mb_substr_count($text, " ");
$char_spacing = $style->length_in_pt($style->letter_spacing);
$_spacing = $spacing + $char_spacing;
$frame->set_position($frame->get_position("x") + $dx);
$frame->set_text_spacing($_spacing);
$dx += $spaces * $_spacing;
}
// The line (should) now occupy the entire width
$line->w = $width;
//}
}
break;
case "center":
case "centre":
foreach ($this->_frame->get_line_boxes() as $line) {
// Centre each line by moving each frame in the line by:
$dx = ($width + $line->left - $line->w - $line->right) / 2;
foreach ($line->get_frames() as $frame) {
// Block frames are not aligned by text-align
if ($frame instanceof BlockFrameDecorator) {
continue;
}
$frame->set_position($frame->get_position("x") + $dx);
}
}
break;
}
}
/**
* Align inline children vertically.
* Aligns each child vertically after each line is reflowed
*/
function vertical_align()
{
$canvas = null;
foreach ($this->_frame->get_line_boxes() as $line) {
$height = $line->h;
foreach ($line->get_frames() as $frame) {
$style = $frame->get_style();
if ($style->display !== "inline") {
continue;
}
$align = $frame->get_parent()->get_style()->vertical_align;
if (!isset($canvas)) {
$canvas = $frame->get_root()->get_dompdf()->get_canvas();
}
$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)
{
$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)
{
$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;
}
// 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();
}
}
}
}