1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
/* Button.java -- AWT button widget
Copyright (C) 1999, 2002 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
As a special exception, if you link this library with other files to
produce an executable, this library does not by itself cause the
resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the
executable file might be covered by the GNU General Public License. */
package java.awt;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.peer.ButtonPeer;
import java.awt.peer.ComponentPeer;
import java.util.EventListener;
/**
* This class provides a button widget for the AWT.
*
* @author Aaron M. Renn (arenn@urbanophile.com)
* @author Tom Tromey <tromey@cygnus.com>
*/
public class Button extends Component implements java.io.Serializable
{
/*
* Static Variables
*/
// FIXME: Need readObject/writeObject for serialization
// Serialization version constant
private static final long serialVersionUID = -8774683716313001058L;
/*************************************************************************/
/*
* Instance Variables
*/
/**
* @serial The action command name for this button.
*/
private String actionCommand;
/**
* @serial The label for this button.
*/
private String label;
// List of ActionListeners for this class.
private transient ActionListener action_listeners;
/*************************************************************************/
/*
* Constructors
*/
/**
* Initializes a new instance of <code>Button</code> with no label.
*/
public
Button()
{
this(null);
}
/*************************************************************************/
/**
* Initializes a new instance of <code>Button</code> with the specified
* label. The action command name is also initialized to this value.
*
* @param label The label to display on the button.
*/
public
Button(String label)
{
this.label = label;
actionCommand = label;
}
/*************************************************************************/
/*
* Instance Variables
*/
/**
* Returns the label for this button.
*
* @return The label for this button.
*/
public String
getLabel()
{
return(label);
}
/*************************************************************************/
/**
* Sets the label for this button to the specified value.
*
* @param label The new label for this button.
*/
public synchronized void
setLabel(String label)
{
this.label = label;
if (peer != null)
{
ButtonPeer bp = (ButtonPeer) peer;
bp.setLabel (label);
}
}
/*************************************************************************/
/**
* Returns the action command name for this button.
*
* @return The action command name for this button.
*/
public String
getActionCommand()
{
return(actionCommand);
}
/*************************************************************************/
/**
* Sets the action command name for this button to the specified value.
*
* @param actionCommand The new action command name.
*/
public void
setActionCommand(String actionCommand)
{
this.actionCommand = actionCommand == null ? label : actionCommand;
}
/*************************************************************************/
/**
* Adds a new entry to the list of listeners that will receive
* action events from this button.
*
* @param listener The listener to add.
*/
public synchronized void
addActionListener(ActionListener listener)
{
action_listeners = AWTEventMulticaster.add(action_listeners, listener);
}
/*************************************************************************/
/**
* Removes the specified listener from the list of listeners that will
* receive action events from this button.
*
* @param listener The listener to remove.
*/
public synchronized void
removeActionListener(ActionListener listener)
{
action_listeners = AWTEventMulticaster.remove(action_listeners, listener);
}
public EventListener[]
getListeners(Class listenerType)
{
if (listenerType == ActionListener.class)
return getListenersImpl(listenerType, action_listeners);
return super.getListeners(listenerType);
}
/*************************************************************************/
/**
* Notifies this button that it should create its native peer object.
*/
public void
addNotify()
{
if (peer == null)
peer = getToolkit ().createButton (this);
super.addNotify();
}
/*************************************************************************/
/**
* Processes an event for this button. If the specified event is an
* instance of <code>ActionEvent</code>, then the
* <code>processActionEvent()</code> method is called to dispatch it
* to any registered listeners. Otherwise, the superclass method
* will be invoked. Note that this method will not be called at all
* unless <code>ActionEvent</code>'s are enabled. This will be done
* implicitly if any listeners are added.
*
* @param event The event to process.
*/
protected void
processEvent(AWTEvent event)
{
if (event instanceof ActionEvent)
processActionEvent((ActionEvent)event);
else
super.processEvent(event);
}
/*************************************************************************/
/**
* This method dispatches an action event for this button to any
* registered listeners.
*
* @param event The event to process.
*/
protected void
processActionEvent(ActionEvent event)
{
if (action_listeners != null)
action_listeners.actionPerformed(event);
}
void
dispatchEventImpl(AWTEvent e)
{
super.dispatchEventImpl(e);
if (e.id <= ActionEvent.ACTION_LAST
&& e.id >= ActionEvent.ACTION_FIRST
&& (action_listeners != null
|| (eventMask & AWTEvent.ACTION_EVENT_MASK) != 0))
processEvent(e);
}
/*************************************************************************/
/**
* Returns a debugging string for this button.
*
* @return A debugging string for this button.
*/
protected String
paramString()
{
return ("label=" + getLabel() + ",actionCommand=" + getActionCommand()
+ "," + super.paramString());
}
} // class Button
|
