third_party/WebKit/Source/modules/accessibility/AXTableColumn.cpp

/*
 * Copyright (C) 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */

#include "modules/accessibility/AXTableColumn.h"

#include "core/layout/LayoutTableCell.h"
#include "modules/accessibility/AXObjectCacheImpl.h"
#include "modules/accessibility/AXTableCell.h"

namespace blink {

using namespace HTMLNames;

AXTableColumn::AXTableColumn(AXObjectCacheImpl& axObjectCache)
    : AXMockObject(axObjectCache) {}

AXTableColumn::~AXTableColumn() {}

AXTableColumn* AXTableColumn::create(AXObjectCacheImpl& axObjectCache) {
  return new AXTableColumn(axObjectCache);
}

void AXTableColumn::setParent(AXObject* parent) {
  AXMockObject::setParent(parent);

  clearChildren();
}

void AXTableColumn::headerObjectsForColumn(AXObjectVector& headers) {
  if (!m_parent)
    return;

  LayoutObject* layoutObject = m_parent->getLayoutObject();
  if (!layoutObject)
    return;

  if (!m_parent->isAXTable())
    return;

  if (toAXTable(m_parent)->isAriaTable()) {
    for (const auto& cell : children()) {
      if (cell->roleValue() == ColumnHeaderRole)
        headers.push_back(cell);
    }
    return;
  }

  if (!layoutObject->isTable())
    return;

  LayoutTable* table = toLayoutTable(layoutObject);
  LayoutTableSection* tableSection = table->topSection();
  for (; tableSection;
       tableSection = table->sectionBelow(tableSection, SkipEmptySections)) {
    unsigned numCols = tableSection->numEffectiveColumns();
    if (m_columnIndex >= numCols)
      continue;
    unsigned numRows = tableSection->numRows();
    for (unsigned r = 0; r < numRows; r++) {
      LayoutTableCell* layoutCell =
          tableSection->primaryCellAt(r, m_columnIndex);
      if (!layoutCell)
        continue;

      AXObject* cell = axObjectCache().getOrCreate(layoutCell->node());
      if (!cell || !cell->isTableCell() || headers.contains(cell))
        continue;

      if (toAXTableCell(cell)->scanToDecideHeaderRole() == ColumnHeaderRole)
        headers.push_back(cell);
    }
  }
}

AXObject* AXTableColumn::headerObject() {
  AXObjectVector headers;
  headerObjectsForColumn(headers);
  if (!headers.size())
    return 0;

  return headers[0].get();
}

bool AXTableColumn::computeAccessibilityIsIgnored(
    IgnoredReasons* ignoredReasons) const {
  if (!m_parent)
    return true;

  if (!m_parent->accessibilityIsIgnored())
    return false;

  if (ignoredReasons)
    m_parent->computeAccessibilityIsIgnored(ignoredReasons);

  return true;
}

void AXTableColumn::addChildren() {
  ASSERT(!isDetached());
  ASSERT(!m_haveChildren);

  m_haveChildren = true;
  if (!m_parent || !m_parent->isAXTable())
    return;

  AXTable* parentTable = toAXTable(m_parent);
  int numRows = parentTable->rowCount();

  for (int i = 0; i < numRows; i++) {
    AXTableCell* cell = parentTable->cellForColumnAndRow(m_columnIndex, i);
    if (!cell)
      continue;

    // make sure the last one isn't the same as this one (rowspan cells)
    if (m_children.size() > 0 && m_children.back() == cell)
      continue;

    m_children.push_back(cell);
  }
}

}  // namespace blink