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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
- */
- /**
- * Reflows block frames
- *
- * @access private
- * @package dompdf
- */
- class Block_Frame_Reflower extends Frame_Reflower {
- // Minimum line width to justify, as fraction of available width
- const MIN_JUSTIFY_WIDTH = 0.80;
- /**
- * @var Block_Frame_Decorator
- */
- protected $_frame;
-
- function __construct(Block_Frame_Decorator $frame) { parent::__construct($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 DOMPDF_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 DOMPDF_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 Block_Frame_Decorator) {
- 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 Block_Frame_Decorator) {
- 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 = Font_Metrics::get_text_width(" ", $style->font_family, $style->font_size);
-
- foreach ($lines as $line) {
- if ( $line->left ) {
- foreach ( $line->get_frames() as $frame ) {
- if ( !$frame instanceof Text_Frame_Decorator ) {
- 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 Text_Frame_Decorator ) {
- 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 Block_Frame_Decorator) {
- 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){
- $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();
- }
- }
- }
- }
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