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nsHTMLTextAccessible.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
 *
 * 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):
 *   Aaron Leventhal (aaronl@netscape.com)
 *   Kyle Yuan (kyle.yuan@sun.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 ***** */

#include "nsHTMLTextAccessible.h"
#include "nsAccessibleTreeWalker.h"
#include "nsBulletFrame.h"
#include "nsIAccessibleDocument.h"
#include "nsIAccessibleEvent.h"
#include "nsIFrame.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsISelection.h"
#include "nsISelectionController.h"

nsHTMLTextAccessible::nsHTMLTextAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell, nsIFrame *aFrame):
nsTextAccessibleWrap(aDomNode, aShell), mFrame(aFrame)
{ 
}

NS_IMETHODIMP nsHTMLTextAccessible::GetName(nsAString& aName)
{
  aName.Truncate();
  if (!mDOMNode) {
    return NS_ERROR_FAILURE;
  }

  nsIFrame *frame = GetFrame();
  NS_ENSURE_TRUE(frame, NS_ERROR_FAILURE);

  nsAutoString name;
  nsresult rv = mDOMNode->GetNodeValue(name);
  NS_ENSURE_SUCCESS(rv, rv);

  if (!frame->GetStyleText()->WhiteSpaceIsSignificant()) {
    // Replace \r\n\t in markup with space unless in this is preformatted text
    // where those characters are significant
    name.ReplaceChar("\r\n\t", ' ');
  }
  aName = name;
  return rv;
}

nsIFrame* nsHTMLTextAccessible::GetFrame()
{
  if (!mWeakShell) {
    return nsnull;
  }
  if (!mFrame) {
    mFrame = nsTextAccessible::GetFrame();
  }
  return mFrame;
}

NS_IMETHODIMP nsHTMLTextAccessible::FireToolkitEvent(PRUint32 aEvent,
                                                     nsIAccessible *aTarget,
                                                     void *aData)
{
  if (aEvent == nsIAccessibleEvent::EVENT_HIDE) {
    mFrame = nsnull;  // Invalidate cached frame
  }
  return nsTextAccessibleWrap::FireToolkitEvent(aEvent, aTarget, aData);
}

NS_IMETHODIMP nsHTMLTextAccessible::GetState(PRUint32 *aState)
{
  nsTextAccessible::GetState(aState);

  nsCOMPtr<nsIAccessibleDocument> docAccessible(GetDocAccessible());
  if (docAccessible) {
    PRBool isEditable;
    docAccessible->GetIsEditable(&isEditable);
    if (!isEditable) {
      *aState |= STATE_READONLY;
    }
  }

  return NS_OK;
}

nsHTMLHRAccessible::nsHTMLHRAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell):
nsLeafAccessible(aDomNode, aShell)
{ 
}

NS_IMETHODIMP nsHTMLHRAccessible::GetRole(PRUint32 *aRole)
{
  *aRole = ROLE_SEPARATOR;
  return NS_OK;
}

NS_IMETHODIMP nsHTMLHRAccessible::GetState(PRUint32 *aState)
{
  nsLeafAccessible::GetState(aState);
  *aState &= ~STATE_FOCUSABLE;
  return NS_OK;
}

nsHTMLLabelAccessible::nsHTMLLabelAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell):
nsTextAccessible(aDomNode, aShell)
{ 
}

NS_IMETHODIMP nsHTMLLabelAccessible::GetName(nsAString& aReturn)
{ 
  nsresult rv = NS_ERROR_FAILURE;
  nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));

  nsAutoString name;
  if (content)
    rv = AppendFlatStringFromSubtree(content, &name);

  if (NS_SUCCEEDED(rv)) {
    // Temp var needed until CompressWhitespace built for nsAString
    name.CompressWhitespace();
    aReturn = name;
  }

  return rv;
}

NS_IMETHODIMP nsHTMLLabelAccessible::GetRole(PRUint32 *aRole)
{
  *aRole = ROLE_STATICTEXT;
  return NS_OK;
}

NS_IMETHODIMP nsHTMLLabelAccessible::GetState(PRUint32 *aState)
{
  nsTextAccessible::GetState(aState);
  *aState &= (STATE_LINKED|STATE_TRAVERSED);  // Only use link states
  return NS_OK;
}

NS_IMETHODIMP nsHTMLLabelAccessible::GetFirstChild(nsIAccessible **aFirstChild) 
{  
  // A <label> is not necessarily a leaf!
  return nsAccessible::GetFirstChild(aFirstChild);
}

  /* readonly attribute nsIAccessible accFirstChild; */
NS_IMETHODIMP nsHTMLLabelAccessible::GetLastChild(nsIAccessible **aLastChild)
{  
  // A <label> is not necessarily a leaf!
  return nsAccessible::GetLastChild(aLastChild);
}

/* readonly attribute long accChildCount; */
NS_IMETHODIMP nsHTMLLabelAccessible::GetChildCount(PRInt32 *aAccChildCount) 
{
  // A <label> is not necessarily a leaf!
  return nsAccessible::GetChildCount(aAccChildCount);
}

nsHTMLLIAccessible::nsHTMLLIAccessible(nsIDOMNode *aDOMNode, nsIWeakReference* aShell, 
                   nsIFrame *aBulletFrame, const nsAString& aBulletText):
  nsBlockAccessible(aDOMNode, aShell)
{
  if (!aBulletText.IsEmpty()) {
    mBulletAccessible = new nsHTMLListBulletAccessible(mDOMNode, mWeakShell, 
                                                       aBulletFrame, aBulletText);
    nsCOMPtr<nsPIAccessNode> bulletANode(mBulletAccessible);
    if (bulletANode) {
      bulletANode->Init();
    }
  }
}

NS_IMETHODIMP nsHTMLLIAccessible::Shutdown()
{
  if (mBulletAccessible) {
    // Ensure that weak pointer to this is nulled out
    mBulletAccessible->Shutdown();
  }
  nsresult rv = nsAccessibleWrap::Shutdown();
  mBulletAccessible = nsnull;
  return rv;
}

NS_IMETHODIMP nsHTMLLIAccessible::GetBounds(PRInt32 *x, PRInt32 *y, PRInt32 *width, PRInt32 *height)
{
  nsresult rv = nsAccessibleWrap::GetBounds(x, y, width, height);
  if (NS_FAILED(rv) || !mBulletAccessible) {
    return rv;
  }

  PRInt32 bulletX, bulletY, bulletWidth, bulletHeight;
  rv = mBulletAccessible->GetBounds(&bulletX, &bulletY, &bulletWidth, &bulletHeight);
  NS_ENSURE_SUCCESS(rv, rv);

  *x = bulletX; // Move x coordinate of list item over to cover bullet as well
  *width += bulletWidth;
  return NS_OK;
}

void nsHTMLLIAccessible::CacheChildren(PRBool aWalkAnonContent)
{
  if (!mBulletAccessible || !mWeakShell) {
    nsAccessibleWrap::CacheChildren(aWalkAnonContent);
    return;
  }

  if (mAccChildCount == eChildCountUninitialized) {
    SetFirstChild(mBulletAccessible);
    mBulletAccessible->SetParent(this);
    mAccChildCount = 1;
    nsAccessibleTreeWalker walker(mWeakShell, mDOMNode, aWalkAnonContent);
    walker.mState.frame = GetFrame();
    walker.GetFirstChild();

    nsCOMPtr<nsPIAccessible> privatePrevAccessible = mBulletAccessible.get();
    while (walker.mState.accessible) {
      ++mAccChildCount;
      privatePrevAccessible->SetNextSibling(walker.mState.accessible);
      privatePrevAccessible = do_QueryInterface(walker.mState.accessible);
      privatePrevAccessible->SetParent(this);
      walker.GetNextSibling();
    }
  }
}


nsHTMLListBulletAccessible::nsHTMLListBulletAccessible(nsIDOMNode* aDomNode, 
  nsIWeakReference* aShell, nsIFrame *aFrame, const nsAString& aBulletText): 
  nsHTMLTextAccessible(aDomNode, aShell, aFrame), mWeakParent(nsnull), mBulletText(aBulletText)
{
}

NS_IMETHODIMP nsHTMLListBulletAccessible::GetUniqueID(void **aUniqueID)
{
  // Since mDOMNode is same as for list item, use |this| pointer as the unique Id
  *aUniqueID = NS_STATIC_CAST(void*, this);
  return NS_OK;
}


NS_IMETHODIMP nsHTMLListBulletAccessible::Shutdown()
{
  mBulletText.Truncate();
  mWeakParent = nsnull;
  return nsHTMLTextAccessible::Shutdown();
}

NS_IMETHODIMP nsHTMLListBulletAccessible::GetName(nsAString &aName)
{
  aName = mBulletText;
  return NS_OK;
}


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