TGAbstractDragUI.java

/*
 * TouchGraph LLC. Apache-Style Software License
 *
 *
 * Copyright (c) 2001-2002 Alexander Shapiro. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by 
 *        TouchGraph LLC (http://www.touchgraph.com/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "TouchGraph" or "TouchGraph LLC" must not be used to endorse 
 *    or promote products derived from this software without prior written 
 *    permission.  For written permission, please contact 
 *    alex@touchgraph.com
 *
 * 5. Products derived from this software may not be called "TouchGraph",
 *    nor may "TouchGraph" appear in their name, without prior written
 *    permission of alex@touchgraph.com.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL TOUCHGRAPH OR ITS CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 
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 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
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 * ====================================================================
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 */

package com.touchgraph.graphlayout.interaction;

import  com.touchgraph.graphlayout.*;

import  java.awt.*;
import  java.awt.event.*;

/** TGAbstractDragUI allows one to write user interfaces that handle
  * what happends when a mouse is pressed, dragged, and released.
  *
  * @author   Alexander Shapiro
  * @version  1.21  $Id: TGAbstractDragUI.java,v 1.1 2006/05/17 06:37:57 hassan Exp $
  */
public abstract class TGAbstractDragUI extends TGSelfDeactivatingUI {

    public TGPanel tgPanel;

    private ADUIMouseListener ml;
    private ADUIMouseMotionListener mml;
    public boolean mouseWasDragged; //To differentiate between mouse pressed+dragged, and mouseClicked

  // ............

   /** Constructor with TGPanel <tt>tgp</tt>.
     */
    public TGAbstractDragUI(TGPanel tgp) {
        tgPanel=tgp;
        ml =new ADUIMouseListener();
        mml=new ADUIMouseMotionListener();
    }

     public final void activate() {
        preActivate();
        tgPanel.addMouseListener(ml);
        tgPanel.addMouseMotionListener(mml);
        mouseWasDragged=false;
     }

    public final void activate(MouseEvent e) {
        activate();
        mousePressed(e);
    }

    public final void deactivate() {
        preDeactivate();
        tgPanel.removeMouseListener(ml);
        tgPanel.removeMouseMotionListener(mml);
        super.deactivate(); //To activate parentUI from TGUserInterface
    }

    public abstract void preActivate();
    public abstract void preDeactivate();

    public abstract void mousePressed( MouseEvent e );
    public abstract void mouseDragged( MouseEvent e );
    public abstract void mouseReleased( MouseEvent e );


    private class ADUIMouseListener extends MouseAdapter {
        public void mousePressed(MouseEvent e) {
            TGAbstractDragUI.this.mousePressed(e);
        }

        public void mouseReleased(MouseEvent e) {
            TGAbstractDragUI.this.mouseReleased(e);
            if (selfDeactivate) deactivate();
        }
    }

    private class ADUIMouseMotionListener extends MouseMotionAdapter {
        public void mouseDragged(MouseEvent e) {
            mouseWasDragged=true;
              TGAbstractDragUI.this.mouseDragged(e);
        }
    }

} // end com.touchgraph.graphlayout.interaction.TGAbstractDragUI