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nsHTMLLinkAccessible.cpp

/* -*- 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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 * 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
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 *
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 * 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):
 *   Aaron Leventhal <aleventh@us.ibm.com> (original author)
 *   Alexander Surkov <surkov.alexander@gmail.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"),
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#include "nsHTMLLinkAccessible.h"

#include "nsILink.h"

////////////////////////////////////////////////////////////////////////////////
// nsHTMLLinkAccessible

nsHTMLLinkAccessible::nsHTMLLinkAccessible(nsIDOMNode* aDomNode,
                                           nsIWeakReference* aShell):
  nsHyperTextAccessibleWrap(aDomNode, aShell)
{ 
}

// Expose nsIAccessibleHyperLink unconditionally
NS_IMPL_ISUPPORTS_INHERITED1(nsHTMLLinkAccessible, nsHyperTextAccessibleWrap,
                             nsIAccessibleHyperLink)

////////////////////////////////////////////////////////////////////////////////
// nsIAccessible

NS_IMETHODIMP
nsHTMLLinkAccessible::GetName(nsAString& aName)
{ 
  aName.Truncate();

  if (IsDefunct())
    return NS_ERROR_FAILURE;

  nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));
  return AppendFlatStringFromSubtree(content, &aName);
}

NS_IMETHODIMP
nsHTMLLinkAccessible::GetRole(PRUint32 *aRole)
{
  NS_ENSURE_ARG_POINTER(aRole);

  *aRole = nsIAccessibleRole::ROLE_LINK;
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLLinkAccessible::GetState(PRUint32 *aState, PRUint32 *aExtraState)
{
  nsresult rv = nsHyperTextAccessibleWrap::GetState(aState, aExtraState);
  NS_ENSURE_SUCCESS(rv, rv);
  if (!mDOMNode)
    return NS_OK;

  *aState  &= ~nsIAccessibleStates::STATE_READONLY;

  nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));
  if (content && content->HasAttr(kNameSpaceID_None,
                                  nsAccessibilityAtoms::name)) {
    // This is how we indicate it is a named anchor
    // In other words, this anchor can be selected as a location :)
    // There is no other better state to use to indicate this.
    *aState |= nsIAccessibleStates::STATE_SELECTABLE;
  }

  nsCOMPtr<nsILink> link = do_QueryInterface(mDOMNode);
  NS_ENSURE_STATE(link);

  nsLinkState linkState;
  link->GetLinkState(linkState);
  if (linkState == eLinkState_NotLink) {
    // This is a named anchor, not a link with also a name attribute. bail out.
    return NS_OK;
  }

  *aState |= nsIAccessibleStates::STATE_LINKED;

  if (linkState == eLinkState_Visited)
    *aState |= nsIAccessibleStates::STATE_TRAVERSED;

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLLinkAccessible::GetValue(nsAString& aValue)
{
  aValue.Truncate();

  nsresult rv = nsHyperTextAccessible::GetValue(aValue);
  NS_ENSURE_SUCCESS(rv, rv);

  if (!aValue.IsEmpty())
    return NS_OK;
  
  nsCOMPtr<nsIPresShell> presShell(do_QueryReferent(mWeakShell));
  if (mDOMNode && presShell)
    return presShell->GetLinkLocation(mDOMNode, aValue);

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLLinkAccessible::GetNumActions(PRUint8 *aNumActions)
{
  NS_ENSURE_ARG_POINTER(aNumActions);

  *aNumActions = 1;
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLLinkAccessible::GetActionName(PRUint8 aIndex, nsAString& aName)
{
  // Action 0 (default action): Jump to link
  aName.Truncate();
  if (aIndex != eAction_Jump)
    return NS_ERROR_INVALID_ARG;

  aName.AssignLiteral("jump");
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLLinkAccessible::DoAction(PRUint8 aIndex)
{
  // Action 0 (default action): Jump to link
  if (aIndex != eAction_Jump)
    return NS_ERROR_INVALID_ARG;

  if (IsDefunct())
    return NS_ERROR_FAILURE;

  nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));
  return DoCommand(content);
}

////////////////////////////////////////////////////////////////////////////////
// nsIAccessibleHyperLink

NS_IMETHODIMP
nsHTMLLinkAccessible::GetURI(PRInt32 aIndex, nsIURI **aURI)
{
  NS_ENSURE_ARG_POINTER(aURI);
  *aURI = nsnull;

  if (aIndex != 0)
    return NS_ERROR_INVALID_ARG;

  nsCOMPtr<nsILink> link(do_QueryInterface(mDOMNode));
  NS_ENSURE_STATE(link);

  return link->GetHrefURI(aURI);
}

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