/* -*- 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):
 *
 * 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
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 * ***** END LICENSE BLOCK ***** */
#ifndef nsITextContent_h___
#define nsITextContent_h___

#include "nsIContent.h"
#include "nsIDocument.h"
class nsString;
class nsTextFragment;

// IID for the nsITextContent interface
// e4ef843f-1061-45e6-9c81-30eac2673f41
#define NS_ITEXT_CONTENT_IID \
{ 0xe4ef843f, 0x1061, 0x45e6, \
 { 0x9c, 0x81, 0x30, 0xea, 0xc2, 0x67, 0x3f, 0x41 } }

/**
 * Interface for textual content. This interface is used to provide
 * an efficient access to text content.
 */
class nsITextContent : public nsIContent {
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ITEXT_CONTENT_IID)

  nsITextContent(nsINodeInfo *aNodeInfo)
    : nsIContent(aNodeInfo)
  {
  }

  /**
   * Get direct access (but read only) to the text in the text content.
   */
  virtual const nsTextFragment *Text() = 0;

  /**
   * Get the length of the text content.
   */
  virtual PRUint32 TextLength() = 0;

  /**
   * Set the text to the given value. If aNotify is PR_TRUE then
   * the document is notified of the content change.
   */
  virtual void SetText(const PRUnichar* aBuffer, PRUint32 aLength,
                       PRBool aNotify) = 0;

  /**
   * Set the text to the given value. If aNotify is PR_TRUE then
   * the document is notified of the content change.
   */
  void SetText(const nsAString& aStr, PRBool aNotify)
  {
    SetText(aStr.BeginReading(), aStr.Length(), aNotify);
  }

  /**
   * Query method to see if the frame is nothing but whitespace
   */
  virtual PRBool IsOnlyWhitespace() = 0;

  /**
   * Append the text content to aResult.
   */
  virtual void AppendTextTo(nsAString& aResult) = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsITextContent, NS_ITEXT_CONTENT_IID)

// XXX These belong elsewhere
/**
 * aNodeInfoManager must not be null.
 */
nsresult
NS_NewTextNode(nsITextContent **aResult, nsNodeInfoManager *aNodeInfoManager);

/**
 * aNodeInfoManager must not be null.
 */
nsresult
NS_NewCommentNode(nsIContent **aResult, nsNodeInfoManager *aNodeInfoManager);


#endif /* nsITextContent_h___ */