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nsHTMLTextAccessible.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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 * for the specific language governing rights and limitations under the
 * License.
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 * 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.
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 * Contributor(s):
 *   Aaron Leventhal (aaronl@netscape.com)
 *   Kyle Yuan (kyle.yuan@sun.com)
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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#ifndef _nsHTMLTextAccessible_H_
#define _nsHTMLTextAccessible_H_

#include "nsTextAccessibleWrap.h"
#include "nsAutoPtr.h"
#include "nsBaseWidgetAccessible.h"

class nsIWeakReference;

class nsHTMLTextAccessible : public nsTextAccessibleWrap
{
public:
  nsHTMLTextAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);
  
  // nsIAccessible
  NS_IMETHOD GetName(nsAString& _retval);
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);
  NS_IMETHOD GetRole(PRUint32 *aRole);
  virtual nsresult GetAttributesInternal(nsIPersistentProperties *aAttributes);
};

class nsHTMLHRAccessible : public nsLeafAccessible
{
public:
  nsHTMLHRAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);
  NS_IMETHOD GetRole(PRUint32 *aRole); 
};

class nsHTMLBRAccessible : public nsLeafAccessible
{
public:
  nsHTMLBRAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);
  NS_IMETHOD GetRole(PRUint32 *aRole); 
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);
  NS_IMETHOD GetName(nsAString& aName);
};

class nsHTMLLabelAccessible : public nsTextAccessible 
{
public:
  nsHTMLLabelAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);
  NS_DECL_ISUPPORTS_INHERITED
  NS_IMETHOD GetName(nsAString& _retval);
  NS_IMETHOD GetRole(PRUint32 *_retval); 
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);
  NS_IMETHOD GetFirstChild(nsIAccessible **aFirstChild);
  NS_IMETHOD GetLastChild(nsIAccessible **aLastChild);
  NS_IMETHOD GetChildCount(PRInt32 *aAccChildCount);
};

class nsHTMLListBulletAccessible : public nsLeafAccessible
{
public:
  nsHTMLListBulletAccessible(nsIDOMNode *aDOMNode, nsIWeakReference* aShell,
                             const nsAString& aBulletText);

  // nsIAccessNode
  NS_IMETHOD GetUniqueID(void **aUniqueID);

  // nsPIAccessNode
  NS_IMETHOD Shutdown();

  // nsIAccessible
  NS_IMETHOD GetName(nsAString& aName);
  NS_IMETHOD GetRole(PRUint32 *aRole);
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);

  // Don't cache via unique ID -- bullet accessible shares the same dom node as
  // this LI accessible. Also, don't cache via mParent/SetParent(), prevent
  // circular reference since li holds onto us.
  NS_IMETHOD SetParent(nsIAccessible *aParentAccessible);
  NS_IMETHOD GetParent(nsIAccessible **aParentAccessible);

  // nsPIAccessible
  NS_IMETHOD AppendTextTo(nsAString& aText, PRUint32 aStartOffset, PRUint32 aLength);

protected:
  // XXX: Ideally we'd get the bullet text directly from the bullet frame via
  // nsBulletFrame::GetListItemText(), but we'd need an interface for getting
  // text from contentless anonymous frames. Perhaps something like
  // nsIAnonymousFrame::GetText() ? However, in practice storing the bullet text
  // here should not be a problem if we invalidate the right parts of
  // the accessibility cache when mutation events occur.
  nsIAccessible *mWeakParent;
  nsString mBulletText;
};

class nsHTMLListAccessible : public nsHyperTextAccessibleWrap
{
public:
  nsHTMLListAccessible(nsIDOMNode *aDOMNode, nsIWeakReference* aShell):
    nsHyperTextAccessibleWrap(aDOMNode, aShell) { }
  NS_IMETHOD GetRole(PRUint32 *aRole) { *aRole = nsIAccessibleRole::ROLE_LIST; return NS_OK; }
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);
};

class nsHTMLLIAccessible : public nsLinkableAccessible
{
public:
  nsHTMLLIAccessible(nsIDOMNode *aDOMNode, nsIWeakReference* aShell, 
                     const nsAString& aBulletText);
  NS_IMETHOD Shutdown();
  NS_IMETHOD GetRole(PRUint32 *aRole) { *aRole = nsIAccessibleRole::ROLE_LISTITEM; return NS_OK; }
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);
  NS_IMETHOD GetName(nsAString& aName) { aName.SetIsVoid(PR_TRUE); return mRoleMapEntry ? nsAccessible::GetName(aName) : NS_OK; }
  NS_IMETHOD GetBounds(PRInt32 *x, PRInt32 *y, PRInt32 *width, PRInt32 *height);
  void CacheChildren();  // Include bullet accessible
protected:
  nsRefPtr<nsHTMLListBulletAccessible> mBulletAccessible;
};

#endif  

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