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1
11 package org.eclipse.swt.widgets;
12
13
14 import org.eclipse.swt.*;
15 import org.eclipse.swt.internal.SWTEventListener;
16
17
23
24 class EventTable {
25 int [] types;
26 Listener [] listeners;
27 int level;
28
29 public void hook (int eventType, Listener listener) {
30 if (types == null) types = new int [4];
31 if (listeners == null) listeners = new Listener [4];
32 int length = types.length, index = length - 1;
33 while (index >= 0) {
34 if (types [index] != 0) break;
35 --index;
36 }
37 index++;
38 if (index == length) {
39 int [] newTypes = new int [length + 4];
40 System.arraycopy (types, 0, newTypes, 0, length);
41 types = newTypes;
42 Listener [] newListeners = new Listener [length + 4];
43 System.arraycopy (listeners, 0, newListeners, 0, length);
44 listeners = newListeners;
45 }
46 types [index] = eventType;
47 listeners [index] = listener;
48 }
49
50 public boolean hooks (int eventType) {
51 if (types == null) return false;
52 for (int i=0; i<types.length; i++) {
53 if (types [i] == eventType) return true;
54 }
55 return false;
56 }
57
58 public void sendEvent (Event event) {
59 if (types == null) return;
60 level += level >= 0 ? 1 : -1;
61 try {
62 for (int i=0; i<types.length; i++) {
63 if (event.type == SWT.None) return;
64 if (types [i] == event.type) {
65 Listener listener = listeners [i];
66 if (listener != null) listener.handleEvent (event);
67 }
68 }
69 } finally {
70 boolean compact = level < 0;
71 level -= level >= 0 ? 1 : -1;
72 if (compact && level == 0) {
73 int index = 0;
74 for (int i=0; i<types.length; i++) {
75 if (types [i] != 0) {
76 types [index] = types [i];
77 listeners [index] = listeners [i];
78 index++;
79 }
80 }
81 for (int i=index; i<types.length; i++) {
82 types [i] = 0;
83 listeners [i] = null;
84 }
85 }
86 }
87 }
88
89 public int size () {
90 if (types == null) return 0;
91 int count = 0;
92 for (int i=0; i<types.length; i++) {
93 if (types [i] != 0) count++;
94 }
95 return count;
96 }
97
98 void remove (int index) {
99 if (level == 0) {
100 int end = types.length - 1;
101 System.arraycopy (types, index + 1, types, index, end - index);
102 System.arraycopy (listeners, index + 1, listeners, index, end - index);
103 index = end;
104 } else {
105 if (level > 0) level = -level;
106 }
107 types [index] = 0;
108 listeners [index] = null;
109 }
110
111 public void unhook (int eventType, Listener listener) {
112 if (types == null) return;
113 for (int i=0; i<types.length; i++) {
114 if (types [i] == eventType && listeners [i] == listener) {
115 remove (i);
116 return;
117 }
118 }
119 }
120
121 public void unhook (int eventType, SWTEventListener listener) {
122 if (types == null) return;
123 for (int i=0; i<types.length; i++) {
124 if (types [i] == eventType) {
125 if (listeners [i] instanceof TypedListener) {
126 TypedListener typedListener = (TypedListener) listeners [i];
127 if (typedListener.getEventListener () == listener) {
128 remove (i);
129 return;
130 }
131 }
132 }
133 }
134 }
135
136 }
137 |
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