001/*
002 * Copyright 2010-2015 Institut Pasteur.
003 * 
004 * This file is part of Icy.
005 * 
006 * Icy is free software: you can redistribute it and/or modify
007 * it under the terms of the GNU General Public License as published by
008 * the Free Software Foundation, either version 3 of the License, or
009 * (at your option) any later version.
010 * 
011 * Icy is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
014 * GNU General Public License for more details.
015 * 
016 * You should have received a copy of the GNU General Public License
017 * along with Icy. If not, see <http://www.gnu.org/licenses/>.
018 */
019package icy.common.listener;
020
021/**
022 * Progress notification listener.
023 * 
024 * @author Stephane
025 */
026public interface ProgressListener
027{
028    /**
029     * Notify progression of the current task
030     * 
031     * @param position
032     *        current position of completion
033     * @param length
034     *        final position of completion
035     * @return <code>false</code> if the cancellation of the task has been requested, <code>true</code> otherwise
036     */
037    public boolean notifyProgress(double position, double length);
038}