accessible/src/html/nsHTMLImageAccessible.h
author Michael Wu <mwu@mozilla.com>
Wed, 28 Sep 2011 23:19:26 -0700
changeset 79445 e7854b4d29ba905ae3994f821b160c989bac4260
parent 74781 be4b064f11599a88f6c7a6ccaaa14abfe32eea5f
child 86933 91c2ca8c60295a27b8caf5de5a86874720f80aa1
child 112094 cad26d2fb5af799dfe030fd2a8948d617eac2f52
permissions -rw-r--r--
Bug 675553 - Switch from PRBool to bool on a CLOSED TREE , r=bsmedberg,khuey,bz,cjones

/* -*- 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
 *
 * 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
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * 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
 * License.
 *
 * The Original Code is mozilla.org 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 (aaronl@netscape.com)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * 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
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** 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, nsIWeakReference *aShell);

  // 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 PRUint32 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);
};

#endif