author Santiago Gimeno <>
Thu, 05 Jan 2012 23:05:03 -0500
changeset 86933 91c2ca8c60295a27b8caf5de5a86874720f80aa1
parent 79445 e7854b4d29ba905ae3994f821b160c989bac4260
child 87094 0ef29ddd07e54d636e64586bc09130e1f315a3e9
child 112420 91c7d8b9c9e96bed8c5f867ccd98fed385638c48
permissions -rw-r--r--
bug 713792 - stop QueryInterface()ing to nsIAccessible image internally r=tbsaunde

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * 1.1 (the "License"); you may not use this file except in compliance with
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 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
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 * The Original Code is code.
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 * Contributor(s):
 *   Author: Aaron Leventhal (
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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"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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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
  nsHTMLImageAccessible(nsIContent *aContent, nsIWeakReference *aShell);

  // nsISupports

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

  // nsIAccessibleImage

  // nsAccessible
  virtual nsresult GetNameInternal(nsAString& aName);
  virtual PRUint32 NativeRole();
  virtual PRUint64 NativeState();
  virtual nsresult GetAttributesInternal(nsIPersistentProperties *aAttributes);

  // ActionAccessible
  virtual PRUint8 ActionCount();

   * 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*
  return IsImageAccessible() ?
    static_cast<nsHTMLImageAccessible*>(this) : nsnull;