/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Radha Kulkarni (radha@netscape.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 "nsISupports.idl"
#include "nsIFactory.idl"
#include "nsISHEntry.idl"
#include "nsISHTransaction.idl"

interface nsISHistoryListener;
interface nsIDocShell;

%{C++
#define NS_SHISTORY_INTERNAL_CID \
{0x5b4cba4c, 0xbf67, 0x499a, {0xae, 0x2c, 0x3f, 0x76, 0x65, 0x6f, 0x4a, 0x4e}}

#define NS_SHISTORY_INTERNAL_CONTRACTID "@mozilla.org/browser/shistory-internal;1"
%}

[scriptable, uuid(494fac3c-64f4-41b8-b209-b4ada899613b)]
interface nsISHistoryInternal: nsISupports
{
  /**
   * Add a new Entry to the History List
   * @param aEntry - The entry to add
   * @param aPersist - If true this specifies that the entry should persist
   * in the list.  If false, this means that when new entries are added
   * this element will not appear in the session history list.
   */
   void  addEntry(in nsISHEntry aEntry, in boolean aPersist);

  /**
   * Get the root transaction
   */
   readonly attribute nsISHTransaction rootTransaction;

  /**
   * The toplevel docshell object to which this SHistory object belongs to.
   */
   attribute nsIDocShell rootDocShell;

  /** 
   * Update the index maintained by sessionHistory
   */
   void updateIndex();

  /**
   * Replace the nsISHEntry at a particular index
   * @param aIndex - The index at which the entry shoud be replaced
   * @param aReplaceEntry - The replacement entry for the index.
   */
   void replaceEntry(in long aIndex, in nsISHEntry aReplaceEntry);

  /** 
   * Get handle to the history listener
   */
   readonly attribute nsISHistoryListener listener;

  /**
   * Evict content viewers until the number of content viewers per tab
   * is no more than gHistoryMaxViewers.  Also, count
   * total number of content viewers globally and evict one if we are over
   * our total max.  This is always called in Show(), after we destroy
   * the previous viewer.
   */
   void evictContentViewers(in long previousIndex, in long index);

   /**
    * Max number of total cached content viewers.  If the pref
    * browser.sessionhistory.max_total_viewers is negative, then
    * this value is calculated based on the total amount of memory.
    * Otherwise, it comes straight from the pref.
    */
   readonly attribute long historyMaxTotalViewers;
};
