/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Interface to allow components to switch between on-line and off-line mode.
 *
 * Authors:
 *   Ettore Perazzoli <ettore@ximian.com>
 *
 * Copyright (C) 2001 Ximian, Inc.
 */

#include <Bonobo.h>

module GNOME {
module Evolution {

struct Connection {
	string hostName;
	string type;
};
typedef sequence<Connection> ConnectionList;

interface OfflineProgressListener {
	/* Update the shell about the progress of going off-line.  The
	   operation is considered completed when the ConnectionList is empty. */
	void updateProgress (in ConnectionList current_active_connections);
};

interface SyncFolderProgressListener {
	/* Report that syncing has progressed.  @progress has to be between 0.0
	   and 1.0.  */
	void updateProgress (in float progress);

	/* Report that the operation has finished.  */
	void reportSuccess ();

	/* Report an error.  */
	void reportFailure (in string message);
};

interface Offline : Bonobo::Unknown {
	exception notPrepared {};
	exception notSyncing {};

	/* Whether the component is currently off-line.  */
	attribute boolean isOffline;

	/* Ask the component to prepare to go into off-line mode.  The
	   component must return a list of the current active connections.
	   After this call, the shell is expected to: (in order)

	   	1. Invoke ::syncFolder for each of the component's folders that
	   	   need to be synchronized to disk for offline usage.

		2. Either invoke ::goOffline (actually complete the operation
		   and go off-line) or ::goOnline (operation cancelled).
	*/
	void prepareForOffline (out ConnectionList active_connection_list);

	/* Request the component to sync the specified folder.  This has to
	   happen after ::prepareForOffline.  */
	oneway void syncFolder (in Folder folder,
				in SyncFolderProgressListener listener);

	/* Request the component to stop syncing the specified folder.  This
	   has to happen after ::syncFolder.  */
	oneway void cancelSyncFolder (in Folder folder);

	/* Ask the component to go into off-line mode.  This always comes after
	   a ::prepareForOffline. */
	void goOffline (in OfflineProgressListener listener)
		raises (notPrepared);

	/* Tell the component to go into on-line mode.  */
	void goOnline ();
};

};
};