MouseListenerTranslator.java :  » Science » jung-2-2_0_1 » edu » uci » ics » jung » visualization » control » Java Open Source

/*
 * Copyright (c) 2003, the JUNG Project and the Regents of the University 
 * of California
 * All rights reserved.
 *
 * This software is open-source under the BSD license; see either
 * "license.txt" or
 * http://jung.sourceforge.net/license.txt for a description.
 */
/*
 * Created on Feb 17, 2004
 */
package edu.uci.ics.jung.visualization.control;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Point2D;

import edu.uci.ics.jung.algorithms.layout.GraphElementAccessor;
import edu.uci.ics.jung.algorithms.layout.Layout;
import edu.uci.ics.jung.visualization.VisualizationViewer;

/**
 * This class translates mouse clicks into vertex clicks
 * 
 * @author danyelf
 */
public class MouseListenerTranslator<V, E> extends MouseAdapter {

  private VisualizationViewer<V,E> vv;
  private GraphMouseListener<V> gel;

  /**
   * @param gel
   * @param vv
   */
  public MouseListenerTranslator(GraphMouseListener<V> gel, VisualizationViewer<V,E> vv) {
    this.gel = gel;
    this.vv = vv;
  }
  
  /**
   * Transform the point to the coordinate system in the
   * VisualizationViewer, then use either PickSuuport
   * (if available) or Layout to find a Vertex
   * @param point
   * @return
   */
  private V getVertex(Point2D point) {
      // adjust for scale and offset in the VisualizationViewer
      Point2D p = point;
        //vv.getRenderContext().getBasicTransformer().inverseViewTransform(point);
      GraphElementAccessor<V,E> pickSupport = vv.getPickSupport();
        Layout<V,E> layout = vv.getGraphLayout();
      V v = null;
      if(pickSupport != null) {
          v = pickSupport.getVertex(layout, p.getX(), p.getY());
      } 
      return v;
  }
  /**
   * @see java.awt.event.MouseListener#mouseClicked(java.awt.event.MouseEvent)
   */
  public void mouseClicked(MouseEvent e) {
      V v = getVertex(e.getPoint());
    if ( v != null ) {
      gel.graphClicked(v, e );
    }
  }

  /**
   * @see java.awt.event.MouseListener#mousePressed(java.awt.event.MouseEvent)
   */
  public void mousePressed(MouseEvent e) {
    V v = getVertex(e.getPoint());
    if ( v != null ) {
      gel.graphPressed(v, e );
    }
  }

  /**
   * @see java.awt.event.MouseListener#mouseReleased(java.awt.event.MouseEvent)
   */
  public void mouseReleased(MouseEvent e) {
    V v = getVertex(e.getPoint());
    if ( v != null ) {
      gel.graphReleased(v, e );
    }
  }
}