accessibilitytable.cpp

来自「linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自Web」· C++ 代码 · 共 490 行 · 第 1/2 页

                    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->getOrCreate(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);
}
    
AccessibilityObject* AccessibilityTable::headerContainer()
{
    if (m_headerContainer)
        return m_headerContainer;
    
    m_headerContainer = static_cast<AccessibilityTableHeaderContainer*>(axObjectCache()->getOrCreate(TableHeaderContainerRole));
    m_headerContainer->setParentTable(this);
    
    return m_headerContainer;
}

AccessibilityObject::AccessibilityChildrenVector& AccessibilityTable::columns()
{
    if (!hasChildren())
        addChildren();
        
    return m_columns;
}

AccessibilityObject::AccessibilityChildrenVector& AccessibilityTable::rows()
{
    if (!hasChildren())
        addChildren();

    return m_rows;
}
    
void AccessibilityTable::rowHeaders(AccessibilityChildrenVector& headers)
{
    if (!m_renderer)
        return;
    
    if (!hasChildren())
        addChildren();
    
    unsigned rowCount = m_rows.size();
    for (unsigned k = 0; k < rowCount; ++k) {
        AccessibilityObject* header = static_cast<AccessibilityTableRow*>(m_rows[k].get())->headerObject();
        if (!header)
            continue;
        headers.append(header);
    }
}

void AccessibilityTable::columnHeaders(AccessibilityChildrenVector& headers)
{
    if (!m_renderer)
        return;
    
    if (!hasChildren())
        addChildren();
    
    unsigned colCount = m_columns.size();
    for (unsigned k = 0; k < colCount; ++k) {
        AccessibilityObject* header = static_cast<AccessibilityTableColumn*>(m_columns[k].get())->headerObject();
        if (!header)
            continue;
        headers.append(header);
    }
}
    
void AccessibilityTable::cells(AccessibilityObject::AccessibilityChildrenVector& cells)
{
    if (!m_renderer)
        return;
    
    if (!hasChildren())
        addChildren();
    
    int numRows = m_rows.size();
    for (int row = 0; row < numRows; ++row) {
        AccessibilityChildrenVector rowChildren = m_rows[row]->children();
        cells.append(rowChildren);
    }
}
    
const unsigned AccessibilityTable::columnCount()
{
    if (!hasChildren())
        addChildren();
    
    return m_columns.size();    
}
    
const unsigned AccessibilityTable::rowCount()
{
    if (!hasChildren())
        addChildren();
    
    return m_rows.size();
}
    
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()->getOrCreate(cell);
    ASSERT(cellObject->isTableCell());
    
    return static_cast<AccessibilityTableCell*>(cellObject);
}

AccessibilityRole AccessibilityTable::roleValue() const
{
    if (!isDataTable())
        return AccessibilityRenderObject::roleValue();

    return TableRole;
}
    
bool AccessibilityTable::accessibilityIsIgnored() const
{
    if (!isDataTable())
        return AccessibilityRenderObject::accessibilityIsIgnored();
    
    return false;
}
    
String AccessibilityTable::title() const
{
    if (!isDataTable())
        return AccessibilityRenderObject::title();
    
    String title;
    if (!m_renderer)
        return title;
    
    // see if there is a caption
    Node* tableElement = m_renderer->node();
    if (tableElement) {
        HTMLTableCaptionElement* caption = static_cast<HTMLTableElement*>(tableElement)->caption();
        if (caption)
            title = caption->innerText();
    }
    
    // try the standard 
    if (title.isEmpty())
        title = AccessibilityRenderObject::title();
    
    return title;
}

bool AccessibilityTable::isDataTable() const
{
    if (!m_renderer)
        return false;
    
    return m_isAccessibilityTable;
}

} // namespace WebCore