/*
 * Copyright (C) 2004 NNL Technology AB
 * Visit www.infonode.net for information about InfoNode(R) 
 * products and how to contact NNL Technology AB.
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, 
 * MA 02111-1307, USA.
 */


// $Id: DockingWindowDragSource.java,v 1.8 2009/02/05 15:57:55 jesper Exp $
package api.infonode.docking.drag;

import javax.swing.JComponent;

import api.infonode.gui.draggable.DraggableComponent;
import api.infonode.gui.draggable.DraggableComponentAdapter;
import api.infonode.gui.draggable.DraggableComponentEvent;

/**
 * Handles the drag and drop of a {@link api.infonode.docking.DockingWindow} triggered by mouse events on a
 * {@link JComponent}. {@link DockingWindowDragSource} handles drag abort with the right mouse button and
 * the key set in the {@link api.infonode.docking.properties.RootWindowProperties#ABORT_DRAG_KEY} property of the
 * {@link api.infonode.docking.RootWindow} which is the drop target.
 *
 * @author $Author: jesper $
 * @version $Revision: 1.8 $
 * @since IDW 1.3.0
 */
public class DockingWindowDragSource {
  private final DraggableComponent draggableComponent;
  private DockingWindowDragger dragger;
  //  private Point startPoint;

  /**
   * Constructor.
   *
   * @param component       the component on which to listen to mouse events that affects the drag and drop of a
   *                        {@link api.infonode.docking.DockingWindow}
   * @param draggerProvider provides the {@link DockingWindowDragger} when the drag operation begins, typically
   *                        this provider gets the dragger by calling
   *                        {@link api.infonode.docking.DockingWindow#startDrag(api.infonode.docking.RootWindow)}
   *                        on the window which should be dragged
   */
  public DockingWindowDragSource(JComponent component,
                                 final DockingWindowDraggerProvider draggerProvider) {
    draggableComponent = new DraggableComponent(component);
    draggableComponent.setReorderEnabled(false);
    draggableComponent.setEnableInsideDrag(true);

    draggableComponent.addListener(new DraggableComponentAdapter() {
      public void dragAborted(DraggableComponentEvent event) {
        abortDrag();
      }

      public void dragged(DraggableComponentEvent event) {
        if (dragger == null) {
          //          startPoint = event.getMouseEvent().getPoint();
          dragger = draggerProvider.getDragger(event.getMouseEvent());

          if (dragger == null) {
            draggableComponent.abortDrag();
            return;
          }

          draggableComponent.setAbortDragKeyCode(dragger.getDropTarget().getRootWindowProperties().getAbortDragKey());
        }

        /*if (startPoint != null &&
            Math.abs(startPoint.x - event.getMouseEvent().getX()) +
            Math.abs(startPoint.y - event.getMouseEvent().getY()) < 16)
          return;*/

        //        startPoint = null;
        dragger.dragWindow(event.getMouseEvent());
      }

      public void dropped(DraggableComponentEvent event) {
        if (dragger != null) {
          dragger.dropWindow(event.getMouseEvent());
          dragger = null;
          //startPoint = null;
        }
      }
    });
  }

  /**
   * Aborts the currect drag operation.
   */
  public void abortDrag() {
    if (dragger != null)
      dragger.abortDrag();

    dragger = null;
    //    startPoint = null;
  }

}
