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/*
* 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
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
*/
package com.touchgraph.graphlayout.interaction;
import com.touchgraph.graphlayout.*;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/** DragNodeUI contains code for dragging nodes.
*
* <p><b>
* Parts of this code build upon Sun's Graph Layout example.
* http://java.sun.com/applets/jdk/1.1/demo/GraphLayout/Graph.java
* </b></p>
*
* @author Alexander Shapiro
* @version 1.22-jre1.1 $Id: DragNodeUI.java,v 1.2 2002/09/20 19:41:06 ldornbusch Exp $
*/
public class DragNodeUI extends TGAbstractDragUI{
/** Stores the distance between the cursor and the center of the node
* when dragging occurs so that the cursor remains at the same position
* on the node otherwise, the cursor jumps to the center of the node.
*/
public Point dragOffs;
// ............
/** Constructor with TGPanel <tt>tgp</tt>.
*/
public DragNodeUI( TGPanel tgp ) {
super(tgp);
}
public void preActivate() {
if (dragOffs ==null) dragOffs=new Point(0,0);
}
public void preDeactivate() {};
public void mousePressed( MouseEvent e ) {
Node mouseOverN = tgPanel.getMouseOverN();
Point mousePos;
if (e!=null) mousePos = e.getPoint(); //e can be null if the wrong activate() method was used
else mousePos= new Point((int) mouseOverN.drawx,(int) mouseOverN.drawy);
if ( mouseOverN != null) { //Should never be null if TGUIManager works properly
tgPanel.setDragNode(mouseOverN);
dragOffs.setLocation((int) (mouseOverN.drawx-mousePos.x), //For when you click to the side of
(int)(mouseOverN.drawy-mousePos.y));//the node, but you still want to drag it
}
}
public void mouseReleased( MouseEvent e ) {
tgPanel.setDragNode(null);
tgPanel.repaintAfterMove();
tgPanel.startDamper();
}
public synchronized void mouseDragged( MouseEvent e ) {
Node dragNode = tgPanel.getDragNode();
dragNode.drawx = e.getX()+dragOffs.x;
dragNode.drawy = e.getY()+dragOffs.y;
tgPanel.updatePosFromDraw(dragNode);
tgPanel.repaintAfterMove();
tgPanel.stopDamper(); //Keep the graph alive while dragging.
e.consume();
}
} // end com.touchgraph.graphlayout.interaction.DragNodeUI
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