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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
#include "nsISupports.idl"

interface nsIBFCacheEntry;
interface nsISHEntry;
interface nsISHistoryListener;
interface nsISHTransaction;
interface nsIDocShell;
interface nsIURI;

%{C++
#define NS_SHISTORY_INTERNAL_CID \
{ 0x3dfb2f54, 0x378d, 0x4d3c, \
  { 0xa9, 0xf9, 0x95, 0xdd, 0x26, 0x73, 0x24, 0x8c } }

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

#include "nsTArrayForwardDeclare.h"
%}

[ref] native nsDocshellIDArray(nsTArray<uint64_t>);

[scriptable, uuid(3dfb2f54-378d-4d3c-a9f9-95dd2673248c)]
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;

  /**
   * Sets the toplevel docshell object to which this SHistory object belongs to.
   */
   void setRootDocShell(in 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 should be replaced
   * @param aReplaceEntry - The replacement entry for the index.
   */
   void replaceEntry(in long aIndex, in nsISHEntry aReplaceEntry);

  /**
   * Notifies all registered session history listeners about an impending
   * reload.
   *
   * @param aReloadURI    The URI of the document to be reloaded.
   * @param aReloadFlags  Flags that indicate how the document is to be
   *                      refreshed. See constants on the nsIWebNavigation
   *                      interface.
   * @return              Whether the operation can proceed.
   */
   boolean notifyOnHistoryReload(in nsIURI aReloadURI, in unsigned long aReloadFlags);

   /**
    * Evict content viewers which don't lie in the "safe" range around aIndex.
    * In practice, this should leave us with no more than gHistoryMaxViewers
    * viewers associated with this SHistory object.
    *
    * Also make sure that the total number of content viewers in all windows is
    * not greater than our global max; if it is, evict viewers as appropriate.
    *
    * @param aIndex - The index around which the "safe" range is centered.  In
    *   general, if you just navigated the history, aIndex should be the index
    *   history was navigated to.
    */
   void evictOutOfRangeContentViewers(in long aIndex);
   
   /**
    * Evict the content viewer associated with a bfcache entry
    * that has timed out.
    */
   void evictExpiredContentViewerForEntry(in nsIBFCacheEntry aEntry);

   /**
    * Evict all the content viewers in this session history
    */
   void evictAllContentViewers();

   /**
    * Removes entries from the history if their docshellID is in
    * aIDs array.
    */
  [noscript, notxpcom] void RemoveEntries(in nsDocshellIDArray aIDs,
                                          in long aStartIndex);
};