1 /*
2 * TouchGraph LLC. Apache-Style Software License
3 *
4 *
5 * Copyright (c) 2001-2002 Alexander Shapiro. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by
22 * TouchGraph LLC (http://www.touchgraph.com/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
25 *
26 * 4. The names "TouchGraph" or "TouchGraph LLC" must not be used to endorse
27 * or promote products derived from this software without prior written
28 * permission. For written permission, please contact
29 * alex@touchgraph.com
30 *
31 * 5. Products derived from this software may not be called "TouchGraph",
32 * nor may "TouchGraph" appear in their name, without prior written
33 * permission of alex@touchgraph.com.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL TOUCHGRAPH OR ITS CONTRIBUTORS BE
39 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
40 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
41 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
42 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
43 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
44 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
45 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
46 * ====================================================================
47 *
48 */
49
50 package com.touchgraph.graphlayout.interaction;
51
52 import java.awt.Point;
53 import java.awt.event.MouseEvent;
54
55 import com.touchgraph.graphlayout.*;
56
57 /*** DragNodeUI contains code for dragging nodes.
58 *
59 * <p><b>
60 * Parts of this code build upon Sun's Graph Layout example.
61 * http://java.sun.com/applets/jdk/1.1/demo/GraphLayout/Graph.java
62 * </b></p>
63 *
64 * @author Alexander Shapiro
65 * @version 1.21 $Id: DragNodeUI.java,v 1.1.1.1 2004/02/06 08:44:07 keesj Exp $
66 */
67 public class DragNodeUI extends TGAbstractDragUI{
68
69 /*** Stores the distance between the cursor and the center of the node
70 * when dragging occurs so that the cursor remains at the same position
71 * on the node otherwise, the cursor jumps to the center of the node.
72 */
73 public Point dragOffs;
74
75 // ............
76
77 /*** Constructor with TGPanel <tt>tgp</tt>.
78 */
79 public DragNodeUI( TGPanel tgp ) {
80 super(tgp);
81 }
82
83 public void preActivate() {
84 if (dragOffs ==null) dragOffs=new Point(0,0);
85 }
86
87 public void preDeactivate() {};
88
89 public void mousePressed( MouseEvent e ) {
90 Node mouseOverN = tgPanel.getMouseOverN();
91 Point mousePos;
92
93 if (e!=null) mousePos = e.getPoint(); //e can be null if the wrong activate() method was used
94 else mousePos= new Point((int) mouseOverN.drawx,(int) mouseOverN.drawy);
95
96 if ( mouseOverN != null) { //Should never be null if TGUIManager works properly
97 tgPanel.setDragNode(mouseOverN);
98
99 dragOffs.setLocation((int) (mouseOverN.drawx-mousePos.x), //For when you click to the side of
100 (int)(mouseOverN.drawy-mousePos.y));//the node, but you still want to drag it
101 }
102 }
103
104 public void mouseReleased( MouseEvent e ) {
105 tgPanel.setDragNode(null);
106 tgPanel.repaintAfterMove();
107 tgPanel.startDamper();
108 }
109
110
111 public void mouseDragged( MouseEvent e ) {
112 Node dragNode = tgPanel.getDragNode();
113 dragNode.drawx = e.getX()+dragOffs.x;
114 dragNode.drawy = e.getY()+dragOffs.y;
115 tgPanel.updatePosFromDraw(dragNode);
116 tgPanel.repaintAfterMove();
117 tgPanel.stopDamper(); //Keep the graph alive while dragging.
118 }
119
120 } // end com.touchgraph.graphlayout.interaction.DragNodeUI