/*
 * Copyright (C) 2010 Brockmann Consult GmbH (info@brockmann-consult.de)
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or (at your option)
 * any later version.
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see http://www.gnu.org/licenses/
 */

package com.bc.ceres.glayer;

import java.awt.geom.Rectangle2D;
import java.beans.PropertyChangeEvent;

/**
 * A change listener.
 *
 * @author Norman Fomferra
 */
public interface LayerListener {
    /**
     * Called if a property of the given layer has changed. The source of the property change event
     * may be either the layer itself or its style (see {@link Layer#getStyle()}).
     *
     * @param layer The layer which triggered the change.
     * @param event The layer property change event.
     */
    void handleLayerPropertyChanged(Layer layer, PropertyChangeEvent event);

    /**
     * Called if the data of the given layer has changed.
     *
     * @param layer       The layer which triggered the change.
     * @param modelRegion The region in model coordinates which are affected by the change. May be null, if not available.
     */
    void handleLayerDataChanged(Layer layer, Rectangle2D modelRegion);

    /**
     * Called if a new layer has been added to a collection layer.
     *
     * @param parentLayer The parent layer which triggered the change.
     * @param childLayers The child layers added.
     */
    void handleLayersAdded(Layer parentLayer, Layer[] childLayers);

    /**
     * Called if an existing layer has been removed from a collection layer.
     *
     * @param parentLayer The parent layer which triggered the change.
     * @param childLayers The child layers removed.
     */
    void handleLayersRemoved(Layer parentLayer, Layer[] childLayers);
}