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<?php
/**
* @package dompdf
* @link http://dompdf.github.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
/**
* Decorates Frames for table layout
*
* @access private
* @package dompdf
*/
class Table_Frame_Decorator extends Frame_Decorator {
static $VALID_CHILDREN = array("table-row-group",
"table-row",
"table-header-group",
"table-footer-group",
"table-column",
"table-column-group",
"table-caption",
"table-cell");
static $ROW_GROUPS = array('table-row-group',
'table-header-group',
'table-footer-group');
/**
* The Cellmap object for this table. The cellmap maps table cells
* to rows and columns, and aids in calculating column widths.
*
* @var Cellmap
*/
protected $_cellmap;
/**
* The minimum width of the table, in pt
*
* @var float
*/
protected $_min_width;
/**
* The maximum width of the table, in pt
*
* @var float
*/
protected $_max_width;
/**
* Table header rows. Each table header is duplicated when a table
* spans pages.
*
* @var array
*/
protected $_headers;
/**
* Table footer rows. Each table footer is duplicated when a table
* spans pages.
*
* @var array
*/
protected $_footers;
/**
* Class constructor
*
* @param Frame $frame the frame to decorate
* @param DOMPDF $dompdf
*/
function __construct(Frame $frame, DOMPDF $dompdf) {
parent::__construct($frame, $dompdf);
$this->_cellmap = new Cellmap($this);
if ( $frame->get_style()->table_layout === "fixed" ) {
$this->_cellmap->set_layout_fixed(true);
}
$this->_min_width = null;
$this->_max_width = null;
$this->_headers = array();
$this->_footers = array();
}
function reset() {
parent::reset();
$this->_cellmap->reset();
$this->_min_width = null;
$this->_max_width = null;
$this->_headers = array();
$this->_footers = array();
$this->_reflower->reset();
}
//........................................................................
/**
* split the table at $row. $row and all subsequent rows will be
* added to the clone. This method is overidden in order to remove
* frames from the cellmap properly.
*
* @param Frame $child
* @param bool $force_pagebreak
*
* @return void
*/
function split(Frame $child = null, $force_pagebreak = false) {
if ( is_null($child) ) {
parent::split();
return;
}
// If $child is a header or if it is the first non-header row, do
// not duplicate headers, simply move the table to the next page.
if ( count($this->_headers) && !in_array($child, $this->_headers, true) &&
!in_array($child->get_prev_sibling(), $this->_headers, true) ) {
$first_header = null;
// Insert copies of the table headers before $child
foreach ($this->_headers as $header) {
$new_header = $header->deep_copy();
if ( is_null($first_header) )
$first_header = $new_header;
$this->insert_child_before($new_header, $child);
}
parent::split($first_header);
} else if ( in_array($child->get_style()->display, self::$ROW_GROUPS) ) {
// Individual rows should have already been handled
parent::split($child);
} else {
$iter = $child;
while ($iter) {
$this->_cellmap->remove_row($iter);
$iter = $iter->get_next_sibling();
}
parent::split($child);
}
}
/**
* Return a copy of this frame with $node as its node
*
* @param DOMNode $node
* @return Frame
*/
function copy(DOMNode $node) {
$deco = parent::copy($node);
// In order to keep columns' widths through pages
$deco->_cellmap->set_columns($this->_cellmap->get_columns());
$deco->_cellmap->lock_columns();
return $deco;
}
/**
* Static function to locate the parent table of a frame
*
* @param Frame $frame
* @return Table_Frame_Decorator the table that is an ancestor of $frame
*/
static function find_parent_table(Frame $frame) {
while ( $frame = $frame->get_parent() )
if ( $frame->is_table() )
break;
return $frame;
}
/**
* Return this table's Cellmap
*
* @return Cellmap
*/
function get_cellmap() { return $this->_cellmap; }
/**
* Return the minimum width of this table
*
* @return float
*/
function get_min_width() { return $this->_min_width; }
/**
* Return the maximum width of this table
*
* @return float
*/
function get_max_width() { return $this->_max_width; }
/**
* Set the minimum width of the table
*
* @param float $width the new minimum width
*/
function set_min_width($width) { $this->_min_width = $width; }
/**
* Set the maximum width of the table
*
* @param float $width the new maximum width
*/
function set_max_width($width) { $this->_max_width = $width; }
/**
* Restructure tree so that the table has the correct structure.
* Invalid children (i.e. all non-table-rows) are moved below the
* table.
*/
function normalise() {
// Store frames generated by invalid tags and move them outside the table
$erroneous_frames = array();
$anon_row = false;
$iter = $this->get_first_child();
while ( $iter ) {
$child = $iter;
$iter = $iter->get_next_sibling();
$display = $child->get_style()->display;
if ( $anon_row ) {
if ( $display === "table-row" ) {
// Add the previous anonymous row
$this->insert_child_before($table_row, $child);
$table_row->normalise();
$child->normalise();
$anon_row = false;
continue;
}
// add the child to the anonymous row
$table_row->append_child($child);
continue;
} else {
if ( $display === "table-row" ) {
$child->normalise();
continue;
}
if ( $display === "table-cell" ) {
// Create an anonymous table row
$tr = $this->get_node()->ownerDocument->createElement("tr");
$frame = new Frame($tr);
$css = $this->get_style()->get_stylesheet();
$style = $css->create_style();
$style->inherit($this->get_style());
// Lookup styles for tr tags. If the user wants styles to work
// better, they should make the tr explicit... I'm not going to
// try to guess what they intended.
if ( $tr_style = $css->lookup("tr") )
$style->merge($tr_style);
// Okay, I have absolutely no idea why I need this clone here, but
// if it's omitted, php (as of 2004-07-28) segfaults.
$frame->set_style(clone $style);
$table_row = Frame_Factory::decorate_frame($frame, $this->_dompdf, $this->_root);
// Add the cell to the row
$table_row->append_child($child);
$anon_row = true;
continue;
}
if ( !in_array($display, self::$VALID_CHILDREN) ) {
$erroneous_frames[] = $child;
continue;
}
// Normalise other table parts (i.e. row groups)
foreach ($child->get_children() as $grandchild) {
if ( $grandchild->get_style()->display === "table-row" ) {
$grandchild->normalise();
}
}
// Add headers and footers
if ( $display === "table-header-group" )
$this->_headers[] = $child;
else if ( $display === "table-footer-group" )
$this->_footers[] = $child;
}
}
if ( $anon_row ) {
// Add the row to the table
$this->_frame->append_child($table_row);
$table_row->normalise();
$this->_cellmap->add_row();
}
foreach ($erroneous_frames as $frame)
$this->move_after($frame);
}
//........................................................................
/**
* Moves the specified frame and it's corresponding node outside of
* the table.
*
* @param Frame $frame the frame to move
*/
function move_after(Frame $frame) {
$this->get_parent()->insert_child_after($frame, $this);
}
}
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