1    package graphics.graph; 
2     
3    import java.awt.*; 
4    import java.awt.event.MouseEvent; 
5    import java.awt.event.MouseListener; 
6    import java.awt.event.MouseMotionListener; 
7     
8    public class MouseEventHandler 
9            implements MouseListener, MouseMotionListener 
10           /** 
11            *  This used to be the class called MousePanel. 
12            *  The responsibility of this class is to listen for MouseEvents 
13            *  including clicks, drags, etc. and handle them appropriately. 
14            *  A Component will be passed in as part of the Constructor. 
15            *  It is on that component that the gui.mouse.m2.mouse events will be handled. 
16            *  When the appropriate response has been calculated, a message 
17            *  is sent to repaint the component and the gui.mouse.m2.mouse event is consumed. 
18            */ { 
19       private PickBean pb = PickBean.getPickBean(); 
20       private PickFixedBean pfb = PickFixedBean.getPickFixedBean(); 
21       private Nodes nodes = GraphFactory.getNodes(); 
22       private Component component; 
23    
24       public MouseEventHandler(Component c) { 
25           component = c; 
26       } 
27    
28       //1.1 event handling 
29       public void mouseClicked(MouseEvent e) { 
30       } 
31    
32       public void mouseEntered(MouseEvent e) { 
33       } 
34    
35       public void mouseExited(MouseEvent e) { 
36       } 
37    
38       public void mouseMoved(MouseEvent e) { 
39       } 
40    
41       public void mousePressed(MouseEvent e) { 
42           component.addMouseMotionListener(this); 
43           double bestdist = Double.MAX_VALUE; 
44           int x = e.getX(); 
45           int y = e.getY(); 
46           for (int i = 0; i < nodes.getNumberOfNodes(); i++) { 
47               Node n = nodes.getNode(i); 
48               double dist = (n.getX() - x) * (n.getX() - x) 
49                       + (n.getY() - y) * (n.getY() - y); 
50               if (dist < bestdist) { 
51                   pb.setPick(n); 
52                   bestdist = dist; 
53               } 
54           } 
55           Node pickedNode = pb.getPick(); 
56           pfb.setPickFixed(pickedNode.isFixed()); 
57           pickedNode.setFixed(true); 
58           pickedNode.setX(x); 
59           pickedNode.setY(y); 
60           component.repaint(); 
61           e.consume(); 
62       } 
63    
64       public void mouseReleased(MouseEvent e) { 
65           component.removeMouseMotionListener(this); 
66           Node n = pb.getPick(); 
67           if (n != null) { 
68               n.setX(e.getX()); 
69               n.setY(e.getY()); 
70               if (e.isShiftDown()) 
71                   n.setFixed(true); 
72               else 
73                   n.setFixed(pfb.getPickFixed()); 
74               if (e.isAltDown()) 
75                   n.setFixed(false); 
76    
77               pb.setPick(null); 
78           } 
79           component.repaint(); 
80           e.consume(); 
81       } 
82    
83       public void mouseDragged(MouseEvent e) { 
84           if (pb.getPick() == null) return; 
85           pb.getPick().setX(e.getX()); 
86           pb.getPick().setY(e.getY()); 
87           component.repaint(); 
88           e.consume(); 
89       } 
90   }