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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
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 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   Author: Aaron Leventhal (aaronl@netscape.com)
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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 * ***** END LICENSE BLOCK ***** */

#ifndef _nsHTMLImageAccessible_H_
#define _nsHTMLImageAccessible_H_

#include "nsBaseWidgetAccessible.h"
#include "nsIAccessibleImage.h"

/* Accessible for supporting images
 * supports:
 * - gets name, role
 * - support basic state
 */
class nsHTMLImageAccessible : public nsLinkableAccessible,
                              public nsIAccessibleImage
{
public:
  nsHTMLImageAccessible(nsIContent* aContent, nsDocAccessible* aDoc);

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // nsIAccessible
  NS_IMETHOD GetActionName(PRUint8 aIndex, nsAString& aName);
  NS_IMETHOD DoAction(PRUint8 index);

  // nsIAccessibleImage
  NS_DECL_NSIACCESSIBLEIMAGE

  // nsAccessible
  virtual nsresult GetNameInternal(nsAString& aName);
  virtual mozilla::a11y::role NativeRole();
  virtual PRUint64 NativeState();
  virtual nsresult GetAttributesInternal(nsIPersistentProperties *aAttributes);

  // ActionAccessible
  virtual PRUint8 ActionCount();

private:
  /**
   * Determine if this image accessible has a longdesc attribute.
   *
   * @returns  true if the longdesc attribute is present.
   */
  bool HasLongDesc();
  
  /**
   * Used by GetActionName and DoAction to ensure the index for opening the
   * longdesc URL is valid.
   * It is always assumed that the highest possible index opens the longdesc.
   *
   * @param aIndex  The 0-based index to be tested.
   *
   * @returns  true if index is valid for longdesc action.
   */
  bool IsValidLongDescIndex(PRUint8 aIndex);
};

////////////////////////////////////////////////////////////////////////////////
// nsAccessible downcasting method
inline nsHTMLImageAccessible*
nsAccessible::AsImage()
{
  return IsImageAccessible() ?
    static_cast<nsHTMLImageAccessible*>(this) : nsnull;
}

#endif