text: /*
   * Copyright (C) 2010 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.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "modules/accessibility/AXMenuListOption.h"
  
  #include "modules/accessibility/AXMenuListPopup.h"
  #include "modules/accessibility/AXObjectCacheImpl.h"
  
  namespace blink {
  
  using namespace HTMLNames;
  
  AXMenuListOption::AXMenuListOption(HTMLOptionElement* element, AXObjectCacheImpl& axObjectCache)
      : AXMockObject(axObjectCache)
      , m_element(element)
  {
  }
  
  AXMenuListOption::~AXMenuListOption()
  {
      ASSERT(!m_element);
  }
  
  void AXMenuListOption::detach()
  {
      m_element = nullptr;
      AXMockObject::detach();
  }
  
  AccessibilityRole AXMenuListOption::roleValue() const
  {
      const AtomicString& ariaRole = getAttribute(roleAttr);
      if (ariaRole.isEmpty())
          return MenuListOptionRole;
  
      AccessibilityRole role = ariaRoleToWebCoreRole(ariaRole);
      if (role)
          return role;
      return MenuListOptionRole;
  }
  
  Element* AXMenuListOption::actionElement() const
  {
      return m_element;
  }
  
  bool AXMenuListOption::isEnabled() const
  {
      // isDisabledFormControl() returns true if the parent <select> element is disabled,
      // which we don't want.
      return m_element && !m_element->ownElementDisabled();
  }
  
  bool AXMenuListOption::isVisible() const
  {
      if (!m_parent)
          return false;
  
      // In a single-option select with the popup collapsed, only the selected
      // item is considered visible.
      return !m_parent->isOffScreen() || isSelected();
  }
  
  bool AXMenuListOption::isOffScreen() const
  {
      // Invisible list options are considered to be offscreen.
      return !isVisible();
  }
  
  bool AXMenuListOption::isSelected() const
  {
      AXMenuListPopup* parent = static_cast<AXMenuListPopup*>(parentObject());
      if (parent && !parent->isOffScreen())
          return parent->activeChild() == this;
      return m_element && m_element->selected();
  }
  
  void AXMenuListOption::setSelected(bool b)
  {
      if (!m_element || !canSetSelectedAttribute())
          return;
  
      m_element->setSelected(b);
  }
  
  bool AXMenuListOption::canSetSelectedAttribute() const
  {
      return isEnabled();
  }
  
  bool AXMenuListOption::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReasons) const
  {
      return accessibilityIsIgnoredByDefault(ignoredReasons);
  }
  
  LayoutRect AXMenuListOption::elementRect() const
  {
      AXObject* parent = parentObject();
      if (!parent)
          return LayoutRect();
      ASSERT(parent->isMenuListPopup());
  
      AXObject* grandparent = parent->parentObject();
      if (!grandparent)
          return LayoutRect();
      ASSERT(grandparent->isMenuList());
  
      return grandparent->elementRect();
  }
  
  String AXMenuListOption::textAlternative(bool recursive, bool inAriaLabelledByTraversal, AXObjectSet& visited, AXNameFrom& nameFrom, AXRelatedObjectVector* relatedObjects, NameSources* nameSources) const
  {
      // If nameSources is non-null, relatedObjects is used in filling it in, so it must be non-null as well.
      if (nameSources)
          ASSERT(relatedObjects);
  
      if (!getNode())
          return String();
  
      bool foundTextAlternative = false;
      String textAlternative = ariaTextAlternative(recursive, inAriaLabelledByTraversal, visited, nameFrom, relatedObjects, nameSources, &foundTextAlternative);
      if (foundTextAlternative && !nameSources)
          return textAlternative;
  
      nameFrom = AXNameFromContents;
      textAlternative = m_element->displayLabel();
      if (nameSources) {
          nameSources->append(NameSource(foundTextAlternative));
          nameSources->last().type = nameFrom;
          nameSources->last().text = textAlternative;
          foundTextAlternative = true;
      }
  
      return textAlternative;
  
  }
  
  DEFINE_TRACE(AXMenuListOption)
  {
      visitor->trace(m_element);
      AXMockObject::trace(visitor);
  }
  
  } // namespace blink
  