1 /*
2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26
27 package sun.lwawt;
28
29 import java.awt.Checkbox;
30 import java.awt.CheckboxGroup;
31 import java.awt.Component;
32 import java.awt.Dimension;
33 import java.awt.event.ItemEvent;
34 import java.awt.event.ItemListener;
35 import java.awt.peer.CheckboxPeer;
36 import java.beans.Transient;
37
38 import javax.swing.JCheckBox;
39 import javax.swing.JComponent;
40 import javax.swing.JRadioButton;
41 import javax.swing.JToggleButton;
42 import javax.swing.SwingUtilities;
43
44 /**
45 * Lightweight implementation of {@link CheckboxPeer}. Delegates most of the
46 * work to the {@link JCheckBox} and {@link JRadioButton}, which are placed
47 * inside an empty {@link JComponent}.
48 */
49 final class LWCheckboxPeer
50 extends LWComponentPeer<Checkbox, LWCheckboxPeer.CheckboxDelegate>
51 implements CheckboxPeer, ItemListener {
52
53 LWCheckboxPeer(final Checkbox target,
54 final PlatformComponent platformComponent) {
55 super(target, platformComponent);
56 }
57
58 @Override
59 CheckboxDelegate createDelegate() {
60 return new CheckboxDelegate();
61 }
62
63 @Override
64 Component getDelegateFocusOwner() {
65 return getDelegate().getCurrentButton();
66 }
67
68 @Override
69 void initializeImpl() {
70 super.initializeImpl();
71 setLabel(getTarget().getLabel());
72 setState(getTarget().getState());
73 setCheckboxGroup(getTarget().getCheckboxGroup());
74 }
75
76 @Override
77 public void itemStateChanged(final ItemEvent e) {
78 // group.setSelectedCheckbox() will repaint the component
79 // to let LWCheckboxPeer correctly handle it we should call it
80 // after the current event is processed
81 SwingUtilities.invokeLater(new Runnable() {
82 @Override
83 public void run() {
84 boolean postEvent = true;
85 final CheckboxGroup group = getTarget().getCheckboxGroup();
86 if (group != null) {
87 if (e.getStateChange() == ItemEvent.SELECTED) {
88 if (group.getSelectedCheckbox() != getTarget()) {
89 group.setSelectedCheckbox(getTarget());
90 } else {
91 postEvent = false;
92 }
93 } else {
94 postEvent = false;
95 if (group.getSelectedCheckbox() == getTarget()) {
96 // Don't want to leave the group with no selected
97 // checkbox.
98 getTarget().setState(true);
99 }
100 }
101 } else {
102 getTarget().setState(e.getStateChange()
103 == ItemEvent.SELECTED);
104 }
105 if (postEvent) {
106 postEvent(new ItemEvent(getTarget(),
107 ItemEvent.ITEM_STATE_CHANGED,
108 getTarget().getLabel(),
109 e.getStateChange()));
110 }
111 }
112 });
113 }
114
115 @Override
116 public void setCheckboxGroup(final CheckboxGroup g) {
117 synchronized (getDelegateLock()) {
118 getDelegate().getCurrentButton().removeItemListener(this);
119 getDelegate().setRadioButton(g != null);
120 getDelegate().getCurrentButton().addItemListener(this);
121 }
122 repaintPeer();
123 }
124
125 @Override
126 public void setLabel(final String label) {
127 synchronized (getDelegateLock()) {
128 getDelegate().setText(label);
129 }
130 }
131
132 @Override
133 public void setState(final boolean state) {
134 synchronized (getDelegateLock()) {
135 getDelegate().setSelected(state);
136 }
137 repaintPeer();
138 }
139
140 @Override
141 public boolean isFocusable() {
142 return true;
143 }
144
145 @SuppressWarnings("serial")// Safe: outer class is non-serializable.
146 final class CheckboxDelegate extends JComponent {
147
148 private final JCheckBox cb;
149 private final JRadioButton rb;
150
151 CheckboxDelegate() {
152 super();
153 cb = new JCheckBox() {
154 @Override
155 public boolean hasFocus() {
156 return getTarget().hasFocus();
157 }
158 };
159 rb = new JRadioButton() {
160 @Override
161 public boolean hasFocus() {
162 return getTarget().hasFocus();
163 }
164 };
165 setLayout(null);
166 setRadioButton(false);
167 add(rb);
168 add(cb);
169 }
170
171 @Override
172 public void setEnabled(final boolean enabled) {
173 super.setEnabled(enabled);
174 rb.setEnabled(enabled);
175 cb.setEnabled(enabled);
176 }
177
178 @Override
179 public void setOpaque(final boolean isOpaque) {
180 super.setOpaque(isOpaque);
181 rb.setOpaque(isOpaque);
182 cb.setOpaque(isOpaque);
183 }
184
185 @Override
186 @Deprecated
187 public void reshape(final int x, final int y, final int w,
188 final int h) {
189 super.reshape(x, y, w, h);
190 cb.setBounds(0, 0, w, h);
191 rb.setBounds(0, 0, w, h);
192 }
193
194 @Override
195 public Dimension getPreferredSize() {
196 return getCurrentButton().getPreferredSize();
197 }
198
199 @Override
200 @Transient
201 public Dimension getMinimumSize() {
202 return getCurrentButton().getMinimumSize();
203 }
204
205 void setRadioButton(final boolean showRadioButton) {
206 rb.setVisible(showRadioButton);
207 cb.setVisible(!showRadioButton);
208 }
209
210 @Transient
211 JToggleButton getCurrentButton() {
212 return cb.isVisible() ? cb : rb;
213 }
214
215 void setText(final String label) {
216 cb.setText(label);
217 rb.setText(label);
218 }
219
220 void setSelected(final boolean state) {
221 cb.setSelected(state);
222 rb.setSelected(state);
223 }
224 }
225 }