/* -*- 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"
interface nsIHistoryEntry;
interface nsISHistoryListener;
interface nsISimpleEnumerator;
/**
* An interface to the primary properties of the Session History
* component. In an embedded browser environment, the nsIWebBrowser
* object creates an instance of session history for each open window.
* A handle to the session history object can be obtained from
* nsIWebNavigation. In a non-embedded situation, the owner of the
* session history component must create a instance of it and set
* it in the nsIWebNavigation object.
* This interface is accessible from javascript.
*
* @status FROZEN
*/
%{C++
#define NS_SHISTORY_CID \
{0x7294fe9c, 0x14d8, 0x11d5, {0x98, 0x82, 0x00, 0xC0, 0x4f, 0xa0, 0x2f, 0x40}}
#define NS_SHISTORY_CONTRACTID "@mozilla.org/browser/shistory;1"
%}
[scriptable, uuid(7294FE9B-14D8-11D5-9882-00C04FA02F40)]
interface nsISHistory: nsISupports
{
/**
* A readonly property of the interface that returns
* the number of toplevel documents currently available
* in session history.
*/
readonly attribute long count;
/**
* A readonly property of the interface that returns
* the index of the current document in session history.
*/
readonly attribute long index;
/**
* A read/write property of the interface, used to Get/Set
* the maximum number of toplevel documents, session history
* can hold for each instance.
*/
attribute long maxLength;
/**
* Called to obtain handle to the history entry at a
* given index.
*
* @param index The index value whose entry is requested.
* @param modifyIndex A boolean flag that indicates if the current
* index of session history should be modified
* to the parameter index.
*
* @return <code>NS_OK</code> history entry for
* the index is obtained successfully.
* <code>NS_ERROR_FAILURE</code> Error in obtaining
* history entry for the given index.
*/
nsIHistoryEntry getEntryAtIndex(in long index, in boolean modifyIndex);
/**
* Called to purge older documents from history.
* Documents can be removed from session history for various
* reasons. For example to control memory usage of the browser, to
* prevent users from loading documents from history, to erase evidence of
* prior page loads etc...
*
* @param numEntries The number of toplevel documents to be
* purged from history. During purge operation,
* the latest documents are maintained and older
* 'numEntries' documents are removed from history.
* @throws <code>NS_SUCCESS_LOSS_OF_INSIGNIFICANT_DATA</code> Purge was vetod.
* @throws <code>NS_ERROR_FAILURE</code> numEntries is
* invalid or out of bounds with the size of history.
*
*/
void PurgeHistory(in long numEntries);
/**
* Called to register a listener for the session history component.
* Listeners are notified when pages are loaded or purged from history.
*
* @param aListener Listener object to be notified for all
* page loads that initiate in session history.
*
* @note A listener object must implement
* nsISHistoryListener and nsSupportsWeakReference
*
* @see nsISHistoryListener
* @see nsSupportsWeakReference
*/
void addSHistoryListener(in nsISHistoryListener aListener);
/**
* Called to remove a listener for the session history component.
* Listeners are notified when pages are loaded from history.
*
* @param aListener Listener object to be removed from
* session history.
*
* @note A listener object must implement
* nsISHistoryListener and nsSupportsWeakReference
* @see nsISHistoryListener
* @see nsSupportsWeakReference
*/
void removeSHistoryListener(in nsISHistoryListener aListener);
/**
* Called to obtain a enumerator for all the documents stored in
* session history. The enumerator object thus returned by this method
* can be traversed using nsISimpleEnumerator.
*
* @note To access individual history entries of the enumerator, perform the
* following steps:
* 1) Call nsISHistory->GetSHistoryEnumerator() to obtain handle
* the nsISimpleEnumerator object.
* 2) Use nsISimpleEnumerator->GetNext() on the object returned
* by step #1 to obtain handle to the next object in the list.
* The object returned by this step is of type nsISupports.
* 3) Perform a QueryInterface on the object returned by step #2
* to nsIHistoryEntry.
* 4) Use nsIHistoryEntry to access properties of each history entry.
*
* @see nsISimpleEnumerator
* @see nsIHistoryEntry
* @see QueryInterface()
* @see do_QueryInterface()
*/
readonly attribute nsISimpleEnumerator SHistoryEnumerator;
};