/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape 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/NPL/
 *
 * 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):
 *      John Gaunt (jgaunt@netscape.com)
 *
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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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 * the provisions above, a recipient may use your version of this file under
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 * ***** END LICENSE BLOCK ***** */

#ifndef _nsAccessible_H_
#define _nsAccessible_H_

#include "nsAccessNodeWrap.h"
#include "nsIAccessible.h"
#include "nsPIAccessible.h"
#include "nsWeakReference.h"
#include "nsIDOMNodeList.h"
#include "nsString.h"

struct nsRect;
class nsIContent;
class nsIFrame;
class nsIPresShell;
class nsIDOMNode;
class nsIAtom;

// When mNextSibling is set to this, it indicates there ar eno more siblings
#define DEAD_END_ACCESSIBLE NS_STATIC_CAST(nsIAccessible*, (void*)1)

class nsAccessible : public nsAccessNodeWrap, 
                     public nsIAccessible, 
                     public nsPIAccessible
{
public:
  // to eliminate the confusion of "magic numbers" -- if ( 0 ){ foo; }
  enum { eAction_Switch=0, eAction_Jump=0, eAction_Click=0, eAction_Select=0 };
  // how many actions
  enum { eNo_Action=0, eSingle_Action=1 };

  nsAccessible(nsIDOMNode* aNode, nsIWeakReference* aShell);
  virtual ~nsAccessible();

  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_NSIACCESSIBLE
  NS_DECL_NSPIACCESSIBLE

  static nsresult GetFocusedNode(nsIDOMNode *aCurrentNode, nsIDOMNode **aFocusedNode);

  // nsIAccessNode
  NS_IMETHOD Shutdown();

#ifdef MOZ_ACCESSIBILITY_ATK
  static nsresult GetParentBlockNode(nsIPresShell *aPresShell, nsIDOMNode *aCurrentNode, nsIDOMNode **aBlockNode);
  static nsIFrame* GetParentBlockFrame(nsIFrame *aFrame);
  static PRBool FindTextFrame(PRInt32 &index, nsIPresContext *aPresContext, nsIFrame *aCurFrame, 
                                   nsIFrame **aFirstTextFrame, const nsIFrame *aTextFrame);
#endif

  static PRBool IsCorrectFrameType(nsIFrame* aFrame, nsIAtom* aAtom);

protected:
  virtual nsIFrame* GetBoundsFrame();
  virtual void GetBoundsRect(nsRect& aRect, nsIFrame** aRelativeFrame);
  PRBool IsPartiallyVisible(PRBool *aIsOffscreen); 
  NS_IMETHOD AppendLabelText(nsIDOMNode *aLabelNode, nsAString& _retval);
  NS_IMETHOD AppendLabelFor(nsIContent *aLookNode, const nsAString *aId, nsAString *aLabel);
  NS_IMETHOD GetHTMLName(nsAString& _retval);
  NS_IMETHOD GetXULName(nsAString& _retval);
  NS_IMETHOD AppendFlatStringFromSubtree(nsIContent *aContent, nsAString *aFlatString);
  NS_IMETHOD AppendFlatStringFromContentNode(nsIContent *aContent, nsAString *aFlatString);
  NS_IMETHOD AppendStringWithSpaces(nsAString *aFlatString, const nsAString& textEquivalent);

  // helper method to verify frames
  static nsresult GetFullKeyName(const nsAString& aModifierName, const nsAString& aKeyName, nsAString& aStringOut);
  static nsresult GetTranslatedString(const nsAString& aKey, nsAString& aStringOut);
  void GetScrollOffset(nsRect *aRect);
  void GetScreenOrigin(nsIPresContext *aPresContext, nsIFrame *aFrame, nsRect *aRect);
  nsresult AppendFlatStringFromSubtreeRecurse(nsIContent *aContent, nsAString *aFlatString);
  void CacheChildren(PRBool aWalkNormalDOM);

  // Data Members
  nsCOMPtr<nsIAccessible> mParent;
  nsIAccessible *mFirstChild, *mNextSibling;
};

#endif