AccessibilityObject* AccessibilityTableCell::titleUIElement() const
{
// Try to find if the first cell in this row is a <th>. If it is,
// then it can act as the title ui element. (This is only in the
// case when the table is not appearing as an AXTable.)
if (!m_renderer || isTableCell())
return 0;
RenderTableCell* renderCell = static_cast<RenderTableCell*>(m_renderer);
// If this cell is in the first column, there is no need to continue.
int col = renderCell->col();
if (!col)
return 0;
int row = renderCell->row();
RenderTableSection* section = renderCell->section();
if (!section)
return 0;
RenderTableCell* headerCell = section->cellAt(row, 0).cell;
if (!headerCell || headerCell == renderCell)
return 0;
Node* cellElement = headerCell->element();
if (!cellElement || !cellElement->hasTagName(thTag))
return 0;
return axObjectCache()->get(headerCell);
}
/* recalculates the full structure needed to do layouting and minmax calculations.
This is usually calculated on the fly, but needs to be done fully when table cells change
dynamically
*/
void AutoTableLayout::recalcColumn( int effCol )
{
Layout &l = layoutStruct[effCol];
RenderObject *child = table->firstChild();
// first we iterate over all rows.
RenderTableCell *fixedContributor = 0;
RenderTableCell *maxContributor = 0;
while ( child ) {
if ( child->isTableSection() ) {
RenderTableSection *section = static_cast<RenderTableSection *>(child);
int numRows = section->numRows();
RenderTableCell *last = 0;
for ( int i = 0; i < numRows; i++ ) {
RenderTableCell *cell = section->cellAt( i, effCol );
if ( cell == (RenderTableCell *)-1 )
continue;
if ( cell && cell->colSpan() == 1 ) {
// A cell originates in this column. Ensure we have
// a min/max width of at least 1px for this column now.
l.minWidth = kMax(int( l.minWidth ), 1);
l.maxWidth = kMax(int( l.maxWidth ), 1);
if ( !cell->minMaxKnown() )
cell->calcMinMaxWidth();
if ( cell->minWidth() > l.minWidth )
l.minWidth = cell->minWidth();
if ( cell->maxWidth() > l.maxWidth ) {
l.maxWidth = cell->maxWidth();
maxContributor = cell;
}
Length w = cell->styleOrColWidth();
w.l.value = kMin( 32767, kMax( 0, w.value() ) );
switch( w.type() ) {
case Fixed:
// ignore width=0
if ( w.value() > 0 && !l.width.isPercent() ) {
int wval = cell->calcBoxWidth(w.value());
if ( l.width.isFixed() ) {
// Nav/IE weirdness
if ((wval > l.width.value()) ||
((l.width.value() == wval) && (maxContributor == cell))) {
l.width.l.value = wval;
fixedContributor = cell;
}
} else {
l.width = Length( wval, Fixed );
fixedContributor = cell;
}
}
break;
case Percent:
hasPercent = true;
if ( w.value() > 0 && (!l.width.isPercent() || w.value() > l.width.value() ) )
l.width = w;
break;
case Relative:
if ( w.isVariable() || (w.isRelative() && w.value() > l.width.value() ) )
l.width = w;
default:
break;
}
} else {
if ( cell && (!effCol || section->cellAt( i, effCol-1 ) != cell) ) {
// This spanning cell originates in this column. Ensure we have
// a min/max width of at least 1px for this column now.
l.minWidth = kMax(int( l.minWidth ), 1);
l.maxWidth = kMax(int( l.maxWidth ), 1);
insertSpanCell( cell );
}
last = cell;
}
}
}
child = child->nextSibling();
}
// Nav/IE weirdness
if ( l.width.isFixed() ) {
if ( table->style()->htmlHacks()
&& (l.maxWidth > l.width.value()) && (fixedContributor != maxContributor)) {
l.width = Length();
fixedContributor = 0;
}
}
l.maxWidth = kMax(l.maxWidth, int(l.minWidth));
#ifdef DEBUG_LAYOUT
qDebug("col %d, final min=%d, max=%d, width=%d(%d)", effCol, l.minWidth, l.maxWidth, l.width.value(), l.width.type() );
#endif
// ### we need to add col elements aswell
}
bool AccessibilityTable::isTableExposableThroughAccessibility()
{
// the following is a heuristic used to determine if a
// <table> should be exposed as an AXTable. The goal
// is to only show "data" tables
if (!m_renderer || !m_renderer->isTable())
return false;
// if the developer assigned an aria role to this, then we shouldn't
// expose it as a table, unless, of course, the aria role is a table
AccessibilityRole ariaRole = ariaRoleAttribute();
if (ariaRole == TableRole)
return true;
if (ariaRole != UnknownRole)
return false;
RenderTable* table = static_cast<RenderTable*>(m_renderer);
// this employs a heuristic to determine if this table should appear.
// Only "data" tables should be exposed as tables.
// Unfortunately, there is no good way to determine the difference
// between a "layout" table and a "data" table
Node* tableNode = table->element();
if (!tableNode || !tableNode->hasTagName(tableTag))
return false;
// if there is a caption element, summary, THEAD, or TFOOT section, it's most certainly a data table
HTMLTableElement* tableElement = static_cast<HTMLTableElement*>(tableNode);
if (!tableElement->summary().isEmpty() || tableElement->tHead() || tableElement->tFoot() || tableElement->caption())
return true;
// if someone used "rules" attribute than the table should appear
if (!tableElement->rules().isEmpty())
return true;
// go through the cell's and check for tell-tale signs of "data" table status
// cells have borders, or use attributes like headers, abbr, scope or axis
RenderTableSection* firstBody = table->firstBody();
if (!firstBody)
return false;
int numCols = firstBody->numColumns();
int numRows = firstBody->numRows();
// if there's only one cell, it's not a good AXTable candidate
if (numRows == 1 && numCols == 1)
return false;
// store the background color of the table to check against cell's background colors
RenderStyle* tableStyle = table->style();
if (!tableStyle)
return false;
Color tableBGColor = tableStyle->backgroundColor();
// check enough of the cells to find if the table matches our criteria
// Criteria:
// 1) must have at least one valid cell (and)
// 2) at least half of cells have borders (or)
// 3) at least half of cells have different bg colors than the table, and there is cell spacing
unsigned validCellCount = 0;
unsigned borderedCellCount = 0;
unsigned backgroundDifferenceCellCount = 0;
for (int row = 0; row < numRows; ++row) {
for (int col = 0; col < numCols; ++col) {
RenderTableCell* cell = firstBody->cellAt(row, col).cell;
if (!cell)
continue;
Node* cellNode = cell->element();
if (!cellNode)
continue;
if (cell->width() < 1 || cell->height() < 1)
continue;
validCellCount++;
HTMLTableCellElement* cellElement = static_cast<HTMLTableCellElement*>(cellNode);
// in this case, the developer explicitly assigned a "data" table attribute
if (!cellElement->headers().isEmpty() || !cellElement->abbr().isEmpty() ||
!cellElement->axis().isEmpty() || !cellElement->scope().isEmpty())
return true;
RenderStyle* renderStyle = cell->style();
if (!renderStyle)
continue;
// a cell needs to have matching bordered sides, before it can be considered a bordered cell.
if ((cell->borderTop() > 0 && cell->borderBottom() > 0) ||
(cell->borderLeft() > 0 && cell->borderRight() > 0))
borderedCellCount++;
// if the cell has a different color from the table and there is cell spacing,
// then it is probably a data table cell (spacing and colors take the place of borders)
Color cellColor = renderStyle->backgroundColor();
if (table->hBorderSpacing() > 0 && table->vBorderSpacing() > 0 &&
tableBGColor != cellColor && cellColor.alpha() != 1)
backgroundDifferenceCellCount++;
// if we've found 10 "good" cells, we don't need to keep searching
if (borderedCellCount >= 10 || backgroundDifferenceCellCount >= 10)
return true;
}
}
// if there is less than two valid cells, it's not a data table
if (validCellCount <= 1)
return false;
// half of the cells had borders, it's a data table
unsigned neededCellCount = validCellCount / 2;
if (borderedCellCount >= neededCellCount)
return true;
// half had different background colors, it's a data table
if (backgroundDifferenceCellCount >= neededCellCount)
return true;
return false;
}
AccessibilityTableCell* AccessibilityTable::cellForColumnAndRow(unsigned column, unsigned row)
{
if (!m_renderer)
return 0;
if (!hasChildren())
addChildren();
RenderTable* table = static_cast<RenderTable*>(m_renderer);
RenderTableSection* tableSection = table->header();
if (!tableSection)
tableSection = table->firstBody();
RenderTableCell* cell = 0;
unsigned rowCount = 0;
unsigned rowOffset = 0;
while (tableSection) {
rowCount += tableSection->numRows();
unsigned numCols = tableSection->numColumns();
if (row < rowCount && column < numCols) {
int sectionSpecificRow = row - rowOffset;
cell = tableSection->cellAt(sectionSpecificRow, column).cell;
// we didn't find the cell, which means there's spanning happening
// search backwards to find the spanning cell
if (!cell) {
// first try rows
for (int testRow = sectionSpecificRow-1; testRow >= 0; --testRow) {
cell = tableSection->cellAt(testRow, column).cell;
// cell overlapped. use this one
if (cell && ((cell->row() + (cell->rowSpan()-1)) >= (int)sectionSpecificRow))
break;
cell = 0;
}
if (!cell) {
// try cols
for (int testCol = column-1; testCol >= 0; --testCol) {
cell = tableSection->cellAt(sectionSpecificRow, testCol).cell;
// cell overlapped. use this one
if (cell && ((cell->col() + (cell->colSpan()-1)) >= (int)column))
break;
cell = 0;
}
}
}
}
if (cell)
break;
rowOffset += rowCount;
// we didn't find anything between the rows we should have
if (row < rowOffset)
break;
tableSection = table->sectionBelow(tableSection, true);
}
if (!cell)
return 0;
AccessibilityObject* cellObject = axObjectCache()->get(cell);
ASSERT(cellObject->isTableCell());
return static_cast<AccessibilityTableCell*>(cellObject);
}
void AccessibilityTable::addChildren()
{
if (!isDataTable()) {
AccessibilityRenderObject::addChildren();
return;
}
ASSERT(!m_haveChildren);
m_haveChildren = true;
if (!m_renderer)
return;
RenderTable* table = static_cast<RenderTable*>(m_renderer);
AXObjectCache* axCache = m_renderer->document()->axObjectCache();
// go through all the available sections to pull out the rows
// and add them as children
RenderTableSection* tableSection = table->header();
if (!tableSection)
tableSection = table->firstBody();
if (!tableSection)
return;
RenderTableSection* initialTableSection = tableSection;
while (tableSection) {
HashSet<AccessibilityObject*> appendedRows;
unsigned numRows = tableSection->numRows();
unsigned numCols = tableSection->numColumns();
for (unsigned rowIndex = 0; rowIndex < numRows; ++rowIndex) {
for (unsigned colIndex = 0; colIndex < numCols; ++colIndex) {
RenderTableCell* cell = tableSection->cellAt(rowIndex, colIndex).cell;
if (!cell)
continue;
AccessibilityObject* rowObject = axCache->get(cell->parent());
if (!rowObject->isTableRow())
continue;
AccessibilityTableRow* row = static_cast<AccessibilityTableRow*>(rowObject);
// we need to check every cell for a new row, because cell spans
// can cause us to mess rows if we just check the first column
if (appendedRows.contains(row))
continue;
row->setRowIndex((int)m_rows.size());
m_rows.append(row);
m_children.append(row);
appendedRows.add(row);
}
}
tableSection = table->sectionBelow(tableSection, true);
}
// make the columns based on the number of columns in the first body
unsigned length = initialTableSection->numColumns();
for (unsigned i = 0; i < length; ++i) {
AccessibilityTableColumn* column = static_cast<AccessibilityTableColumn*>(axCache->get(ColumnRole));
column->setColumnIndex((int)i);
column->setParentTable(this);
m_columns.append(column);
m_children.append(column);
}
AccessibilityObject* headerContainerObject = headerContainer();
if (headerContainerObject)
m_children.append(headerContainerObject);
}
