Display table header groups at the top of each page

third_party/WebKit/Source/core/layout/LayoutTableSection.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 954 matching lines @@
         LayoutTableRow* rowLayoutObject = m_grid[r].rowLayoutObject;
         int paginationStrutOnRow = 0;
         if (rowLayoutObject) {
             rowLayoutObject->setLocation(LayoutPoint(0, m_rowPos[r]));
             rowLayoutObject->setLogicalWidth(logicalWidth());
             rowLayoutObject->setLogicalHeight(LayoutUnit(m_rowPos[r + 1] - m_rowPos[r] - vspacing));
             rowLayoutObject->updateLayerTransformAfterLayout();
             if (isPaginated) {
                 paginationStrutOnRow = paginationStrutForRow(rowLayoutObject, LayoutUnit(m_rowPos[r]));
                 if (paginationStrutOnRow) {
+                    LayoutTableSection* header = table()->header();
+                    // If we have a header group we will paint it at the top of each page, move the rows
+                    // down to accomodate it.
+                    if (header && header != this)
+                        paginationStrutOnRow += header->logicalHeight().toInt();
                     for (unsigned rowIndex = r; rowIndex <= totalRows; rowIndex++)
                         m_rowPos[rowIndex] += paginationStrutOnRow;
                 }
             }
         }
 
         int rowHeightIncreaseForPagination = INT_MIN;
 
         for (unsigned c = 0; c < nEffCols; c++) {
             CellStruct& cs = cellAt(r, c);
@@ skipping 107 matching lines @@
 
     ASSERT(!needsLayout());
 
     setLogicalHeight(LayoutUnit(m_rowPos[totalRows]));
 
     computeOverflowFromCells(totalRows, nEffCols);
 }
 
 int LayoutTableSection::paginationStrutForRow(LayoutTableRow* row, LayoutUnit logicalOffset) const
 {
-    if (row->getPaginationBreakability() == AllowAnyBreaks)
+    // Even if the row allows us to break-inside, we will want to put a strut on the row if we have a header
+    // group that wants to appear at the top of each page.
+    bool tableHeaderForcesStrut = table()->header() ? table()->header()->getPaginationBreakability() != AllowAnyBreaks : false;
+    if (row->getPaginationBreakability() == AllowAnyBreaks && !tableHeaderForcesStrut)
         return 0;
     LayoutUnit pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset);
     if (!pageLogicalHeight)
         return 0;
     // If the row is too tall for the page don't insert a strut.
     LayoutUnit rowLogicalHeight = row->logicalHeight();
     if (rowLogicalHeight > pageLogicalHeight)
         return 0;
     LayoutUnit remainingLogicalHeight = pageRemainingLogicalHeightForOffset(logicalOffset, LayoutBlock::AssociateWithLatterPage);
     if (remainingLogicalHeight >= rowLogicalHeight)
@@ skipping 542 matching lines @@
     // FIXME: The table's direction should determine our row's direction, not the section's (see bug 96691).
     if (!style()->isLeftToRightDirection())
         cellLocation.setX(LayoutUnit(table()->effectiveColumnPositions()[table()->numEffectiveColumns()] - table()->effectiveColumnPositions()[table()->absoluteColumnToEffectiveColumn(cell->absoluteColumnIndex() + cell->colSpan())] + horizontalBorderSpacing));
     else
         cellLocation.setX(LayoutUnit(table()->effectiveColumnPositions()[effectiveColumn] + horizontalBorderSpacing));
 
     cell->setLogicalLocation(cellLocation);
 }
 
 } // namespace blink