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1
10
11 package swingwt.awt.dnd;
12
13 import java.util.ArrayList  ;
14 import java.util.TooManyListenersException ;
15
16 import org.eclipse.swt.dnd.DragSource;
17
18 import swingwt.awt.Component;
19 import swingwt.awt.Point;
20 import swingwt.awt.event.InputEvent;
21
22 public abstract class DragGestureRecognizer {
23
24 protected DragGestureRecognizer(DragSource ds, Component c, int sa, DragGestureListener dgl) {
25
26 super();
27
28 dragSource = ds;
29 component = c;
30 sourceActions = sa &
31 (DnDConstants.ACTION_COPY_OR_MOVE | DnDConstants.ACTION_LINK);
32
33 try {
34 if (dgl != null) addDragGestureListener(dgl);
35 }
36 catch (Exception e) {}
37 }
38
39 protected DragGestureRecognizer(DragSource ds, Component c, int sa) {
40 this(ds, c, sa, null);
41 }
42
43 protected DragGestureRecognizer(DragSource ds, Component c) {
44 this(ds, c, DnDConstants.ACTION_NONE);
45 }
46
47 protected DragGestureRecognizer(DragSource ds) {
48 this(ds, null);
49 }
50
51 protected abstract void registerListeners();
52
53 protected abstract void unregisterListeners();
54
55 public DragSource getDragSource() {
56 return dragSource;
57 }
58
59 public synchronized Component getComponent() {
60 return component;
61 }
62
63 public synchronized void setComponent(Component c) {
64 if (component != null && dragGestureListener != null)
65 unregisterListeners();
66
67 component = c;
68
69 if (component != null && dragGestureListener != null)
70 registerListeners();
71 }
72
73 public synchronized int getSourceActions() {
74 return sourceActions;
75 }
76
77 public synchronized void setSourceActions(int actions) {
78 sourceActions = actions &
79 (DnDConstants.ACTION_COPY_OR_MOVE | DnDConstants.ACTION_LINK);
80 }
81
82 public InputEvent getTriggerEvent() {
83 return events.isEmpty() ? null : (InputEvent) events.get(0);
84 }
85
86 public void resetRecognizer() {
87 events.clear();
88 }
89
90 public synchronized void addDragGestureListener(DragGestureListener dgl) throws
91 TooManyListenersException {
92 if (dragGestureListener != null)
93 throw new TooManyListenersException ();
94 else {
95 dragGestureListener = dgl;
96
97 if (component != null) registerListeners();
98 }
99 }
100
101 public synchronized void removeDragGestureListener(DragGestureListener dgl) {
102 if (dragGestureListener == null || !dragGestureListener.equals(dgl))
103 throw new IllegalArgumentException ();
104 else {
105 dragGestureListener = null;
106
107 if (component != null) unregisterListeners();
108 }
109 }
110
111 protected synchronized void fireDragGestureRecognized(int dragAction, Point p) {
112 try {
113 if (dragGestureListener != null) {
114 dragGestureListener.dragGestureRecognized(new DragGestureEvent(this,
115 dragAction, p, events));
116 }
117 }
118 finally {
119 events.clear();
120 }
121 }
122
123 protected synchronized void appendEvent(InputEvent awtie) {
124 events.add(awtie);
125 }
126
127 protected DragSource dragSource;
128
129 protected Component component;
130
131 protected transient DragGestureListener dragGestureListener;
132
133 protected int sourceActions;
134 protected ArrayList events = new ArrayList (1);
135
136 }
137 |
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