/**
* Check if $frame will fit on the page. If the frame does not fit,
* the frame tree is modified so that a page break occurs in the
* correct location.
*
* @param Frame $frame the frame to check
* @return Frame the frame following the page break
*/
function check_page_break(Frame $frame)
{
// Do not split if we have already or if the frame was already
// pushed to the next page (prevents infinite loops)
if ($this->_page_full || $frame->_already_pushed) {
return false;
}
// If the frame is absolute of fixed it shouldn't break
$p = $frame;
do {
if ($p->is_absolute()) {
return false;
}
} while ($p = $p->get_parent());
$margin_height = $frame->get_margin_height();
// FIXME If the row is taller than the page and
// if it the first of the page, we don't break
if ($frame->get_style()->display === "table-row" && !$frame->get_prev_sibling() && $margin_height > $this->get_margin_height()) {
return false;
}
// Determine the frame's maximum y value
$max_y = $frame->get_position("y") + $margin_height;
// If a split is to occur here, then the bottom margins & paddings of all
// parents of $frame must fit on the page as well:
$p = $frame->get_parent();
while ($p) {
$style = $p->get_style();
$max_y += $style->length_in_pt(array($style->margin_bottom, $style->padding_bottom, $style->border_bottom_width));
$p = $p->get_parent();
}
// Check if $frame flows off the page
if ($max_y <= $this->_bottom_page_margin) {
// no: do nothing
return false;
}
dompdf_debug("page-break", "check_page_break");
dompdf_debug("page-break", "in_table: " . $this->_in_table);
// yes: determine page break location
$iter = $frame;
$flg = false;
$in_table = $this->_in_table;
dompdf_debug("page-break", "Starting search");
while ($iter) {
// echo "\nbacktrack: " .$iter->get_node()->nodeName ." ".spl_object_hash($iter->get_node()). "";
if ($iter === $this) {
dompdf_debug("page-break", "reached root.");
// We've reached the root in our search. Just split at $frame.
break;
}
if ($this->_page_break_allowed($iter)) {
dompdf_debug("page-break", "break allowed, splitting.");
$iter->split(null, true);
$this->_page_full = true;
$this->_in_table = $in_table;
$frame->_already_pushed = true;
return true;
}
if (!$flg && ($next = $iter->get_last_child())) {
dompdf_debug("page-break", "following last child.");
if ($next->is_table()) {
$this->_in_table++;
}
$iter = $next;
continue;
}
if ($next = $iter->get_prev_sibling()) {
dompdf_debug("page-break", "following prev sibling.");
if ($next->is_table() && !$iter->is_table()) {
$this->_in_table++;
} else {
if (!$next->is_table() && $iter->is_table()) {
$this->_in_table--;
}
}
$iter = $next;
$flg = false;
continue;
}
if ($next = $iter->get_parent()) {
dompdf_debug("page-break", "following parent.");
if ($iter->is_table()) {
$this->_in_table--;
}
$iter = $next;
$flg = true;
continue;
}
break;
}
$this->_in_table = $in_table;
// No valid page break found. Just break at $frame.
dompdf_debug("page-break", "no valid break found, just splitting.");
// If we are in a table, backtrack to the nearest top-level table row
if ($this->_in_table) {
$num_tables = $this->_in_table - 1;
$iter = $frame;
while ($iter && $num_tables && $iter->get_style()->display !== "table") {
$iter = $iter->get_parent();
$num_tables--;
}
$iter = $frame;
while ($iter && $iter->get_style()->display !== "table-row") {
$iter = $iter->get_parent();
}
}
$frame->split(null, true);
$this->_page_full = true;
$frame->_already_pushed = true;
return true;
}
function get_margin_height()
{
return $this->_frame->get_margin_height();
}
function add_frame_to_line(Frame $frame)
{
// Handle inline frames (which are effectively wrappers)
if ($frame instanceof Inline_Frame_Decorator) {
// Handle line breaks
if ($frame->get_node()->nodeName == "br") {
$this->maximize_line_height($frame->get_style()->length_in_pt($frame->get_style()->line_height));
$this->add_line();
return;
}
// Add each child of the inline frame to the line individually
foreach ($frame->get_children() as $child) {
$this->add_frame_to_line($child);
}
return;
}
// Trim leading text if this is an empty line. Kinda a hack to put it here,
// but what can you do...
if ($this->_lines[$this->_cl]["w"] == 0 && $frame->get_node()->nodeName == "#text" && ($frame->get_style()->white_space != "pre" || $frame->get_style()->white_space != "pre-wrap")) {
$frame->set_text(ltrim($frame->get_text()));
$frame->recalculate_width();
}
$w = $frame->get_margin_width();
if ($w == 0) {
return;
}
// Debugging code:
/*
pre_r("\nAdding frame to line:");
// pre_r("Me: " . $this->get_node()->nodeName . " (" . (string)$this->get_node() . ")");
// pre_r("Node: " . $frame->get_node()->nodeName . " (" . (string)$frame->get_node() . ")");
if ( $frame->get_node()->nodeName == "#text" )
pre_r($frame->get_node()->nodeValue);
pre_r("Line width: " . $this->_lines[$this->_cl]["w"]);
pre_r("Frame: " . get_class($frame));
pre_r("Frame width: " . $w);
pre_r("Frame height: " . $frame->get_margin_height());
pre_r("Containing block width: " . $this->get_containing_block("w"));
*/
// End debugging
if ($this->_lines[$this->_cl]["w"] + $w > $this->get_containing_block("w")) {
$this->add_line();
}
$frame->position();
$this->_lines[$this->_cl]["frames"][] = $frame;
if ($frame->get_node()->nodeName == "#text") {
$this->_lines[$this->_cl]["wc"] += count(preg_split("/\\s+/", $frame->get_text()));
}
$this->_lines[$this->_cl]["w"] += $w;
$this->_lines[$this->_cl]["h"] = max($this->_lines[$this->_cl]["h"], $frame->get_margin_height());
}
/**
* Check if $frame will fit on the page. If the frame does not fit,
* the frame tree is modified so that a page break occurs in the
* correct location.
*
* @param Frame $frame the frame to check
* @return Frame the frame following the page break
*/
function check_page_break(Frame $frame)
{
// Do not split if we have already
if ($this->_page_full) {
return false;
}
// Determine the frame's maximum y value
$max_y = $frame->get_position("y") + $frame->get_margin_height();
// If a split is to occur here, then the bottom margins & paddings of all
// parents of $frame must fit on the page as well:
$p = $frame->get_parent();
while ($p) {
$style = $p->get_style();
$max_y += $style->length_in_pt(array($style->margin_bottom, $style->padding_bottom, $style->border_bottom_width));
$p = $p->get_parent();
}
// Check if $frame flows off the page
if ($max_y <= $this->_bottom_page_margin) {
// no: do nothing (?)
return false;
}
// echo "check_page_break\n";
// yes: determine page break location
$iter = $frame;
$flg = false;
$in_table = $this->_in_table;
// echo "Starting search\n";
while ($iter) {
// echo "\nbacktrack: " .$iter->get_node()->nodeName ." ".(string)$iter->get_node(). "\n";
if ($iter === $this) {
// echo "reached root.\n";
// We've reached the root in our search. Just split at $frame.
break;
}
if ($this->_page_break_allowed($iter)) {
// echo "break allowed, splitting.\n";
$iter->split();
$this->_page_full = true;
$this->_in_table = $in_table;
return true;
}
if (!$flg && ($next = $iter->get_last_child())) {
// echo "following last child.\n";
if (in_array($next->get_style()->display, Style::$TABLE_TYPES)) {
$this->_in_table++;
}
$iter = $next;
continue;
}
if ($next = $iter->get_prev_sibling()) {
// echo "following prev sibling.\n";
if (in_array($next->get_style()->display, Style::$TABLE_TYPES) && !in_array($iter->get_style()->display, Style::$TABLE_TYPES)) {
$this->_in_table++;
} else {
if (!in_array($next->get_style()->display, Style::$TABLE_TYPES) && in_array($iter->get_style()->display, Style::$TABLE_TYPES)) {
$this->_in_table--;
}
}
$iter = $next;
$flg = false;
continue;
}
if ($next = $iter->get_parent()) {
// echo "following parent.\n";
if (in_array($iter->get_style()->display, Style::$TABLE_TYPES)) {
$this->_in_table--;
}
$iter = $next;
$flg = true;
continue;
}
break;
}
$this->_in_table = $in_table;
// No valid page break found. Just break at $frame.
// echo "no valid break found, just splitting.\n";
// If we are in a table, backtrack to the nearest table row
if ($this->_in_table) {
$tr = $frame;
while ($tr && $tr->get_style()->display != "table-row") {
$tr = $tr->get_parent();
}
$tr->split();
$this->_page_full = true;
return true;
}
$frame->split();
$this->_page_full = true;
return true;
}
function add_frame_to_line(Frame $frame)
{
// Handle inline frames (which are effectively wrappers)
if ($frame instanceof Inline_Frame_Decorator) {
// Add each child of the inline frame to the line individually
foreach ($frame->get_children() as $child) {
$this->add_frame_to_line($child);
}
return;
}
if ($frame->get_margin_width() == 0) {
return;
}
$w = $frame->get_margin_width();
// Debugging code:
// pre_r("\nAdding frame to line:");
// pre_r("Me: " . $this->get_node()->nodeName . " (" . (string)$this->get_node() . ")");
// pre_r("Node: " . $frame->get_node()->nodeName . " (" . (string)$frame->get_node() . ")");
// if ( $frame->get_node()->nodeName == "#text" )
// pre_r($frame->get_node()->nodeValue);
// pre_r("Line width: " . $this->_lines[$this->_cl]["w"]);
// pre_r("Frame width: " . $w);
// pre_r("Frame height: " . $frame->get_margin_height());
// pre_r("Containing block width: " . $this->get_containing_block("w"));
// End debugging
if ($this->_lines[$this->_cl]["w"] + $w >= $this->get_containing_block("w")) {
$this->add_line();
}
$frame->position();
$this->_lines[$this->_cl]["frames"][] = $frame;
if ($frame->get_node()->nodeName == "#text") {
$this->_lines[$this->_cl]["wc"] += count(preg_split("/\\s+/", $frame->get_text()));
}
$this->_lines[$this->_cl]["w"] += $w;
$this->_lines[$this->_cl]["h"] = max($this->_lines[$this->_cl]["h"], $frame->get_margin_height());
}
function check_page_break(Frame $frame)
{
if ($this->_page_full || $frame->_already_pushed) {
return false;
}
$p = $frame;
do {
if ($p->is_absolute()) {
return false;
}
} while ($p = $p->get_parent());
$margin_height = $frame->get_margin_height();
if ($frame->get_style()->display === "table-row" && !$frame->get_prev_sibling() && $margin_height > $this->get_margin_height()) {
return false;
}
$max_y = $frame->get_position("y") + $margin_height;
$p = $frame->get_parent();
while ($p) {
$style = $p->get_style();
$max_y += $style->length_in_pt(array($style->margin_bottom, $style->padding_bottom, $style->border_bottom_width));
$p = $p->get_parent();
}
if ($max_y <= $this->_bottom_page_margin) {
return false;
}
dompdf_debug("page-break", "check_page_break");
dompdf_debug("page-break", "in_table: " . $this->_in_table);
$iter = $frame;
$flg = false;
$in_table = $this->_in_table;
dompdf_debug("page-break", "Starting search");
while ($iter) {
if ($iter === $this) {
dompdf_debug("page-break", "reached root.");
break;
}
if ($this->_page_break_allowed($iter)) {
dompdf_debug("page-break", "break allowed, splitting.");
$iter->split(null, true);
$this->_page_full = true;
$this->_in_table = $in_table;
$frame->_already_pushed = true;
return true;
}
if (!$flg && ($next = $iter->get_last_child())) {
dompdf_debug("page-break", "following last child.");
if ($next->is_table()) {
$this->_in_table++;
}
$iter = $next;
continue;
}
if ($next = $iter->get_prev_sibling()) {
dompdf_debug("page-break", "following prev sibling.");
if ($next->is_table() && !$iter->is_table()) {
$this->_in_table++;
} else {
if (!$next->is_table() && $iter->is_table()) {
$this->_in_table--;
}
}
$iter = $next;
$flg = false;
continue;
}
if ($next = $iter->get_parent()) {
dompdf_debug("page-break", "following parent.");
if ($iter->is_table()) {
$this->_in_table--;
}
$iter = $next;
$flg = true;
continue;
}
break;
}
$this->_in_table = $in_table;
dompdf_debug("page-break", "no valid break found, just splitting.");
if ($this->_in_table) {
$num_tables = $this->_in_table - 1;
$iter = $frame;
while ($iter && $num_tables && $iter->get_style()->display !== "table") {
$iter = $iter->get_parent();
$num_tables--;
}
$iter = $frame;
while ($iter && $iter->get_style()->display !== "table-row") {
$iter = $iter->get_parent();
}
}
$frame->split(null, true);
$this->_page_full = true;
$frame->_already_pushed = true;
return true;
}