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nsXULTextAccessible.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * 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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 *
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 * 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 (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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// NOTE: alphabetically ordered
#include "nsAccessibilityAtoms.h"
#include "nsAccessibilityUtils.h"
#include "nsBaseWidgetAccessible.h"
#include "nsIDOMXULDescriptionElement.h"
#include "nsINameSpaceManager.h"
#include "nsString.h"
#include "nsXULTextAccessible.h"
#include "nsNetUtil.h"

/**
  * For XUL descriptions and labels
  */
nsXULTextAccessible::nsXULTextAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell):
nsHyperTextAccessibleWrap(aDomNode, aShell)
{ 
}

/* wstring getName (); */
NS_IMETHODIMP nsXULTextAccessible::GetName(nsAString& aName)
{ 
  nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));
  if (!content) {
    return NS_ERROR_FAILURE;  // Node shut down
  }
  // if the value attr doesn't exist, the screen reader must get the accessible text
  // from the accessible text interface or from the children
  return content->GetAttr(kNameSpaceID_None, nsAccessibilityAtoms::value, aName);
}

NS_IMETHODIMP
nsXULTextAccessible::GetState(PRUint32 *aState, PRUint32 *aExtraState)
{
  nsresult rv = nsHyperTextAccessibleWrap::GetState(aState, aExtraState);
  NS_ENSURE_SUCCESS(rv, rv);

  // Labels and description have read only state
  // They are not focusable or selectable
  *aState |= nsIAccessibleStates::STATE_READONLY;
  return NS_OK;
}

NS_IMETHODIMP
nsXULTextAccessible::GetAccessibleRelated(PRUint32 aRelationType,
                                          nsIAccessible **aRelated)
{
  nsresult rv =
    nsHyperTextAccessibleWrap::GetAccessibleRelated(aRelationType, aRelated);
  NS_ENSURE_SUCCESS(rv, rv);
  if (*aRelated) {
    return NS_OK;
  }

  nsIContent *content = GetRoleContent(mDOMNode);
  if (!content)
    return NS_ERROR_FAILURE;

  if (aRelationType == nsIAccessibleRelation::RELATION_LABEL_FOR) {
    // Caption is the label for groupbox
    nsIContent *parent = content->GetParent();
    if (parent && parent->Tag() == nsAccessibilityAtoms::caption) {
      nsCOMPtr<nsIAccessible> parentAccessible;
      GetParent(getter_AddRefs(parentAccessible));
      if (Role(parentAccessible) == nsIAccessibleRole::ROLE_GROUPING) {
        parentAccessible.swap(*aRelated);
      }
    }
  }

  return NS_OK;
}

/**
  * For XUL tooltip
  */
nsXULTooltipAccessible::nsXULTooltipAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell):
nsLeafAccessible(aDomNode, aShell)
{ 
}

NS_IMETHODIMP nsXULTooltipAccessible::GetName(nsAString& aName)
{
  return GetXULName(aName, PR_TRUE);
}

NS_IMETHODIMP
nsXULTooltipAccessible::GetState(PRUint32 *aState, PRUint32 *aExtraState)
{
  nsresult rv = nsLeafAccessible::GetState(aState, aExtraState);
  NS_ENSURE_SUCCESS(rv, rv);

  *aState &= ~nsIAccessibleStates::STATE_FOCUSABLE;
  *aState |= nsIAccessibleStates::STATE_READONLY;
  return NS_OK;
}

NS_IMETHODIMP nsXULTooltipAccessible::GetRole(PRUint32 *_retval)
{
  *_retval = nsIAccessibleRole::ROLE_TOOLTIP;
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////////////
// nsXULLinkAccessible

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

////////////////////////////////////////////////////////////////////////////////
// nsXULLinkAccessible. nsIAccessible

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

  if (IsDefunct())
    return NS_ERROR_FAILURE;

  nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));
  content->GetAttr(kNameSpaceID_None, nsAccessibilityAtoms::href, aValue);
  return NS_OK;
}

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

  if (IsDefunct())
    return NS_ERROR_FAILURE;

  nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));
  content->GetAttr(kNameSpaceID_None, nsAccessibilityAtoms::value, aName);
  if (!aName.IsEmpty())
    return NS_OK;

  return AppendFlatStringFromSubtree(content, &aName);
}

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

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


NS_IMETHODIMP
nsXULLinkAccessible::GetState(PRUint32 *aState, PRUint32 *aExtraState)
{
  nsresult rv = nsHyperTextAccessibleWrap::GetState(aState, aExtraState);
  NS_ENSURE_SUCCESS(rv, rv);

  *aState |= nsIAccessibleStates::STATE_LINKED;
  return NS_OK;
}

NS_IMETHODIMP
nsXULLinkAccessible::GetNumActions(PRUint8 *aNumActions)
{
  NS_ENSURE_ARG_POINTER(aNumActions);
  
  *aNumActions = 1;
  return NS_OK;
}

NS_IMETHODIMP
nsXULLinkAccessible::GetActionName(PRUint8 aIndex, nsAString& aName)
{
  aName.Truncate();

  if (aIndex != eAction_Jump)
    return NS_ERROR_INVALID_ARG;
  
  aName.AssignLiteral("jump");
  return NS_OK;
}

NS_IMETHODIMP
nsXULLinkAccessible::DoAction(PRUint8 aIndex)
{
  if (aIndex != eAction_Jump)
    return NS_ERROR_INVALID_ARG;

  if (IsDefunct())
    return NS_ERROR_FAILURE;

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

////////////////////////////////////////////////////////////////////////////////
// nsXULLinkAccessible. nsIAccessibleHyperLink

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

  if (aIndex != 0)
    return NS_ERROR_INVALID_ARG;

  nsAutoString href;
  nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));
  content->GetAttr(kNameSpaceID_None, nsAccessibilityAtoms::href, href);

  nsCOMPtr<nsIDocument> document = content->GetOwnerDoc();
  return NS_NewURI(aURI, href,
                   document ? document->GetDocumentCharacterSet().get() : nsnull);
}

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