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A window docking framework for Swing
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/*
 * Bibliothek - DockingFrames
 * Library built on Java/Swing, allows the user to "drag and drop"
 * panels containing any Swing-Component the developer likes to add.
 * 
 * Copyright (C) 2007 Benjamin Sigg
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Benjamin Sigg
 * [email protected]
 * CH - Switzerland
 */

package bibliothek.gui.dock.dockable;

import java.awt.Component;
import java.awt.Point;

/**
 * Moving images are used when a drag&drop operation is in progress, and
 * an object has to be shown somehow on the screen.
 * @author Benjamin Sigg
 *
 */
public interface MovingImage {
    /**
     * Gets a Component which represents the {@link MovingImage}. 
     * This method must always return the same Component.
     * @return always the same Component
     */
    public Component getComponent();
    
    /**
     * Gest the preferred offset of this image in respect to the mouse.
     * @param pressPoint the position of the mouse in respect to the element that was selected
     * and that resulted in the creation of this image.
     * @return the offset, or null if a default offset should be used
     */
    public Point getOffset( Point pressPoint );
    
    /**
     * Called before this image is displayed. The method should connect the
     * image with other objects, like the object it represents.

     * This method is never called twice in a row.
     * @param transparency if true, then the window showing this
     * {@link Component} is transparent. If false then the window
     * is not transparent.
     */
    public void bind( boolean transparency );
    
    /**
     * The reverse of {@link #bind(boolean)}. The image should remove any connections
     * to other objects.

     * This method is never called twice in a row.
     */
    public void unbind();
}