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.
   * 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;
   * 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 "config.h"
  #include "modules/accessibility/AXScrollbar.h"
  
  #include "modules/accessibility/AXObjectCacheImpl.h"
  #include "platform/scroll/ScrollableArea.h"
  #include "platform/scroll/Scrollbar.h"
  
  namespace blink {
  
  AXScrollbar::AXScrollbar(Scrollbar* scrollbar, AXObjectCacheImpl* axObjectCache)
      : AXMockObject(axObjectCache)
      , m_scrollbar(scrollbar)
  {
      ASSERT(scrollbar);
  }
  
  void AXScrollbar::detachFromParent()
  {
      m_scrollbar = nullptr;
      AXMockObject::detachFromParent();
  }
  
  PassRefPtr<AXScrollbar> AXScrollbar::create(Scrollbar* scrollbar, AXObjectCacheImpl* axObjectCache)
  {
      return adoptRef(new AXScrollbar(scrollbar, axObjectCache));
  }
  
  LayoutRect AXScrollbar::elementRect() const
  {
      if (!m_scrollbar)
          return LayoutRect();
  
      return m_scrollbar->frameRect();
  }
  
  Document* AXScrollbar::document() const
  {
      AXObject* parent = parentObject();
      if (!parent)
          return 0;
      return parent->document();
  }
  
  AccessibilityOrientation AXScrollbar::orientation() const
  {
      if (!m_scrollbar)
          return AccessibilityOrientationHorizontal;
  
      if (m_scrollbar->orientation() == HorizontalScrollbar)
          return AccessibilityOrientationHorizontal;
      if (m_scrollbar->orientation() == VerticalScrollbar)
          return AccessibilityOrientationVertical;
  
      return AccessibilityOrientationVertical;
  }
  
  bool AXScrollbar::isEnabled() const
  {
      if (!m_scrollbar)
          return false;
      return m_scrollbar->enabled();
  }
  
  float AXScrollbar::valueForRange() const
  {
      if (!m_scrollbar)
          return 0;
  
      return m_scrollbar->currentPos() / m_scrollbar->maximum();
  }
  
  void AXScrollbar::setValue(float value)
  {
      if (!m_scrollbar)
          return;
  
      if (!m_scrollbar->scrollableArea())
          return;
  
      float newValue = value * m_scrollbar->maximum();
      m_scrollbar->scrollableArea()->scrollToOffsetWithoutAnimation(m_scrollbar->orientation(), newValue);
  }
  
  } // namespace blink
  