/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape 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/NPL/
 *
 * 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 Communicator client 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 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
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 * ***** END LICENSE BLOCK ***** */
#ifndef nsIWebShell_h___
#define nsIWebShell_h___

#include "nsIContentViewerContainer.h"

class nsIDocumentLoader;
class nsIURI;

// Interface ID for nsIWebShell
#define NS_IWEB_SHELL_IID \
 { 0xa6cf9058, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}

// Interface ID for nsIWebShellContainer
#define NS_IWEB_SHELL_CONTAINER_IID \
 { 0xa6cf905a, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}

// Class ID for an implementation of nsIWebShell
#define NS_WEB_SHELL_CID \
 { 0xa6cf9059, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}

//----------------------------------------------------------------------

typedef enum {
  nsLoadURL,
  nsLoadHistory,
  nsLoadLink,
  nsLoadRefresh
} nsLoadType;

// Container for web shell's
class nsIWebShellContainer : public nsISupports {
public:
  static const nsIID& GetIID() { static nsIID iid = NS_IWEB_SHELL_CONTAINER_IID; return iid; }

};

//----------------------------------------------------------------------

/**
 * The web shell is a container for implementations of nsIContentViewer.
 * It is a content-viewer-container and also knows how to delegate certain
 * behavior to an nsIWebShellContainer.
 *
 * Web shells can be arranged in a tree.
 *
 * Web shells are also nsIWebShellContainer's because they can contain
 * other web shells.
 */
class nsIWebShell : public nsIContentViewerContainer {
public:
  static const nsIID& GetIID() { static nsIID iid = NS_IWEB_SHELL_IID; return iid; }

  /**
   * Set the nsIWebShellContainer for the WebShell.
   */
  NS_IMETHOD SetContainer(nsIWebShellContainer* aContainer) = 0;

  /**
   * Return the current nsIWebShellContainer.
   */
  NS_IMETHOD GetContainer(nsIWebShellContainer*& aResult) = 0;

  /**
   * Returns the top level window (this would be the containing window
   * the same object that implements nsIWebShellContainer, nsIWebShellWindow).
   */
  NS_IMETHOD GetTopLevelWindow(nsIWebShellContainer** aTopLevelWindow) = 0;

  /**
   * Return the root WebShell instance.  Since WebShells can be nested 
   * (when frames are present for example) this instance represents the 
   * outermost WebShell.
   */
  NS_IMETHOD GetRootWebShell(nsIWebShell*& aResult) = 0;

  /**
   * Get the referrer of the link using this WebShell.
   */
  NS_IMETHOD GetReferrer(nsIURI **aReferrer) = 0;

  //
  // Document load api's
  //
  /**
   * Return the nsIDocumentLoader associated with the WebShell.
   */
  NS_IMETHOD GetDocumentLoader(nsIDocumentLoader*& aResult) = 0;

  //
  // History api's
  //
  /**
   * Load the previous document in the history list.
   */
  NS_IMETHOD GoTo(PRInt32 aHistoryIndex) = 0;
  NS_IMETHOD GetHistoryLength(PRInt32& aResult) = 0;
  NS_IMETHOD GetHistoryIndex(PRInt32& aResult) = 0;
  NS_IMETHOD GetURL(PRInt32 aHistoryIndex, PRUnichar **aURLResult) = 0;

  // SetToolBar
  // SetMenuBar
  // SetStatusBar

  /**
    * Finds text in content
   */
  NS_IMETHOD FindNext(const PRUnichar * aSearchStr, PRBool aMatchCase, PRBool aSearchDown, PRBool &aIsFound) = 0;

  /**
   * Set the URL of the current WebShell.
   */
  NS_IMETHOD SetURL(const PRUnichar* aURL) = 0;
};

#endif /* nsIWebShell_h___ */