/**
  * @return AbstractFrameDecorator
  */
 function get_prev_sibling()
 {
     $s = $this->_frame->get_prev_sibling();
     if ($s && ($deco = $s->get_decorator())) {
         while ($tmp = $deco->get_decorator()) {
             $deco = $tmp;
         }
         return $deco;
     } else {
         if ($s) {
             return $s;
         }
     }
     return null;
 }
示例#2
0
 /**
  * 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) {
         $max_y += $p->get_style()->computed_bottom_spacing();
         $p = $p->get_parent();
     }
     // Check if $frame flows off the page
     if ($max_y <= $this->_bottom_page_margin) {
         // no: do nothing
         return false;
     }
     Helpers::dompdf_debug("page-break", "check_page_break");
     Helpers::dompdf_debug("page-break", "in_table: " . $this->_in_table);
     // yes: determine page break location
     $iter = $frame;
     $flg = false;
     $in_table = $this->_in_table;
     Helpers::dompdf_debug("page-break", "Starting search");
     while ($iter) {
         // echo "\nbacktrack: " .$iter->get_node()->nodeName ." ".spl_object_hash($iter->get_node()). "";
         if ($iter === $this) {
             Helpers::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)) {
             Helpers::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 = $iter->get_last_child())) {
             Helpers::dompdf_debug("page-break", "following last child.");
             if ($next->is_table()) {
                 $this->_in_table++;
             }
             $iter = $next;
             continue;
         }
         if ($next = $iter->get_prev_sibling()) {
             Helpers::dompdf_debug("page-break", "following prev sibling.");
             if ($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 = $iter->get_parent()) {
             Helpers::dompdf_debug("page-break", "following parent.");
             if ($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 $frame.
     Helpers::dompdf_debug("page-break", "no valid break found, just splitting.");
     // If we are in a table, backtrack to the nearest top-level table row
     if ($this->_in_table) {
         $iter = $frame;
         while ($iter && $iter->get_style()->display !== "table-row" && $iter->get_style()->display !== 'table-row-group') {
             $iter = $iter->get_parent();
         }
         $iter->split(null, true);
     } else {
         $frame->split(null, true);
     }
     $this->_page_full = true;
     $frame->_already_pushed = true;
     return true;
 }