/* -*- Mode: C++; tab-width: 4; 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 the Mozilla gecko engine.
 *
 * The Initial Developer of the Original Code is
 * Benjamin Smedberg <bsmedberg@covad.net>.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * 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
 * 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 ***** */

/**
 * Provides information about global history to gecko. 
 *
 * @note  This interface replaces and deprecates nsIGlobalHistory.
 * @status UNDER_REVIEW
 */

#include "nsISupports.idl"
interface nsIURI;

%{ C++

// nsIObserver topic to fire when you add new visited URIs to the history;
// the nsIURI is the subject
#define NS_LINK_VISITED_EVENT_TOPIC "link-visited"

// This is NOT part of the interface! It could change.
#define NS_GECKO_FLAG_NEEDS_VERTICAL_SCROLLBAR (1 << 0)

%}

[scriptable, uuid(fbcfa5ca-5d05-4726-b325-d0e6563a1715)]
interface nsIGlobalHistory2 : nsISupports
{
    /**
     * Add a URI to global history
     *
     * @param aURI      the URI of the page
     * @param aRedirect whether the URI was redirected to another location;
     *                  this is 'true' for the original URI which is
     *                  redirected.
     * @param aToplevel whether the URI is loaded in a top-level window
     * @param aReferrer the URI of the referring page
     *
     * @note  Docshell will not filter out URI schemes like chrome: data:
     *        about: and view-source:.  Embedders should consider filtering out
     *        these schemes and others, e.g. mailbox: for the main URI and the
     *        referrer.
     */
    void addURI(in nsIURI aURI, in boolean aRedirect, in boolean aToplevel, in nsIURI aReferrer);

    /**
     * Checks to see whether the given URI is in history.
     *
     * @param aURI the uri to the page
     * @return true if a URI has been visited
     */
    boolean isVisited(in nsIURI aURI);

    /**
     * Set the page title for the given uri. URIs that are not already in
     * global history will not be added.
     *
     * @param aURI    the URI for which to set to the title
     * @param aTitle  the page title
     */
    void setPageTitle(in nsIURI aURI, in AString aTitle);

    /**
     * Get the Gecko flags for this URI. These flags are used by Gecko as hints
     * to optimize page loading. Not all histories have them; this need not be
     * supported (just return NS_ERROR_NOT_IMPLEMENTED. These flags are opaque
     * and should not be interpreted by the history engine.
     */
    unsigned long getURIGeckoFlags(in nsIURI aURI);
    /**
     * Set the Gecko flags for this URI. May fail if the history entry
     * doesn't have any flags or if there is no entry for the URI.
     */
    void setURIGeckoFlags(in nsIURI aURI, in unsigned long aFlags);
};
