1 /*
2 * Copyright (c) 1997, 2018, 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 package javax.swing.plaf.basic;
27
28 import sun.swing.DefaultLookup;
29 import sun.swing.UIAction;
30 import javax.swing.*;
31 import javax.swing.event.*;
32 import java.awt.Color;
33 import java.awt.Component;
34 import java.awt.Container;
35 import java.awt.Dimension;
36 import java.awt.Graphics;
37 import java.awt.Insets;
38 import java.awt.Point;
39 import java.awt.Rectangle;
40 import java.awt.event.*;
41 import java.beans.PropertyChangeEvent;
42 import java.beans.PropertyChangeListener;
43
44 import javax.swing.border.*;
45 import javax.swing.plaf.*;
46
47
48 /**
49 * A default L&F implementation of MenuBarUI. This implementation
50 * is a "combined" view/controller.
51 *
52 * @author Georges Saab
53 * @author David Karlton
54 * @author Arnaud Weber
55 */
56 public class BasicMenuBarUI extends MenuBarUI {
57
58 /**
59 * The instance of {@code JMenuBar}.
60 */
61 protected JMenuBar menuBar = null;
62
63 /**
64 * The instance of {@code ContainerListener}.
65 */
66 protected ContainerListener containerListener;
67
68 /**
69 * The instance of {@code ChangeListener}.
70 */
71 protected ChangeListener changeListener;
72 private Handler handler;
73
74 /**
75 * Returns a new instance of {@code BasicMenuBarUI}.
76 *
77 * @param x a component
78 * @return a new instance of {@code BasicMenuBarUI}
79 */
80 public static ComponentUI createUI(JComponent x) {
81 return new BasicMenuBarUI();
82 }
83
84 static void loadActionMap(LazyActionMap map) {
85 map.put(new Actions(Actions.TAKE_FOCUS));
86 }
87
88 public void installUI(JComponent c) {
89 menuBar = (JMenuBar) c;
90
91 installDefaults();
92 installListeners();
93 installKeyboardActions();
94
95 }
96
97 /**
98 * Installs default properties.
99 */
100 protected void installDefaults() {
101 if (menuBar.getLayout() == null ||
102 menuBar.getLayout() instanceof UIResource) {
103 menuBar.setLayout(new DefaultMenuLayout(menuBar,BoxLayout.LINE_AXIS));
104 }
105
106 LookAndFeel.installProperty(menuBar, "opaque", Boolean.TRUE);
107 LookAndFeel.installBorder(menuBar,"MenuBar.border");
108 LookAndFeel.installColorsAndFont(menuBar,
109 "MenuBar.background",
110 "MenuBar.foreground",
111 "MenuBar.font");
112 }
113
114 /**
115 * Registers listeners.
116 */
117 protected void installListeners() {
118 containerListener = createContainerListener();
119 changeListener = createChangeListener();
120
121 for (int i = 0; i < menuBar.getMenuCount(); i++) {
122 JMenu menu = menuBar.getMenu(i);
123 if (menu!=null)
124 menu.getModel().addChangeListener(changeListener);
125 }
126 menuBar.addContainerListener(containerListener);
127 }
128
129 /**
130 * Registers keyboard actions.
131 */
132 protected void installKeyboardActions() {
133 InputMap inputMap = getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
134
135 SwingUtilities.replaceUIInputMap(menuBar,
136 JComponent.WHEN_IN_FOCUSED_WINDOW, inputMap);
137
138 LazyActionMap.installLazyActionMap(menuBar, BasicMenuBarUI.class,
139 "MenuBar.actionMap");
140 }
141
142 InputMap getInputMap(int condition) {
143 if (condition == JComponent.WHEN_IN_FOCUSED_WINDOW) {
144 Object[] bindings = (Object[])DefaultLookup.get
145 (menuBar, this, "MenuBar.windowBindings");
146 if (bindings != null) {
147 return LookAndFeel.makeComponentInputMap(menuBar, bindings);
148 }
149 }
150 return null;
151 }
152
153 public void uninstallUI(JComponent c) {
154 uninstallDefaults();
155 uninstallListeners();
156 uninstallKeyboardActions();
157
158 menuBar = null;
159 }
160
161 /**
162 * Uninstalls default properties.
163 */
164 protected void uninstallDefaults() {
165 if (menuBar!=null) {
166 LookAndFeel.uninstallBorder(menuBar);
167 }
168 }
169
170 /**
171 * Unregisters listeners.
172 */
173 protected void uninstallListeners() {
174 menuBar.removeContainerListener(containerListener);
175
176 for (int i = 0; i < menuBar.getMenuCount(); i++) {
177 JMenu menu = menuBar.getMenu(i);
178 if (menu !=null)
179 menu.getModel().removeChangeListener(changeListener);
180 }
181
182 containerListener = null;
183 changeListener = null;
184 handler = null;
185 }
186
187 /**
188 * Unregisters keyboard actions.
189 */
190 protected void uninstallKeyboardActions() {
191 SwingUtilities.replaceUIInputMap(menuBar, JComponent.
192 WHEN_IN_FOCUSED_WINDOW, null);
193 SwingUtilities.replaceUIActionMap(menuBar, null);
194 }
195
196 /**
197 * Returns an instance of {@code ContainerListener}.
198 *
199 * @return an instance of {@code ContainerListener}
200 */
201 protected ContainerListener createContainerListener() {
202 return getHandler();
203 }
204
205 /**
206 * Returns an instance of {@code ChangeListener}.
207 *
208 * @return an instance of {@code ChangeListener}
209 */
210 protected ChangeListener createChangeListener() {
211 return getHandler();
212 }
213
214 private Handler getHandler() {
215 if (handler == null) {
216 handler = new Handler();
217 }
218 return handler;
219 }
220
221
222 public Dimension getMinimumSize(JComponent c) {
223 return null;
224 }
225
226 public Dimension getMaximumSize(JComponent c) {
227 return null;
228 }
229
230 private class Handler implements ChangeListener, ContainerListener {
231 //
232 // ChangeListener
233 //
234 public void stateChanged(ChangeEvent e) {
235 int i,c;
236 for(i=0,c = menuBar.getMenuCount() ; i < c ; i++) {
237 JMenu menu = menuBar.getMenu(i);
238 if(menu !=null && menu.isSelected()) {
239 menuBar.getSelectionModel().setSelectedIndex(i);
240 break;
241 }
242 }
243 }
244
245 //
246 // ContainerListener
247 //
248 public void componentAdded(ContainerEvent e) {
249 Component c = e.getChild();
250 if (c instanceof JMenu)
251 ((JMenu)c).getModel().addChangeListener(changeListener);
252 }
253 public void componentRemoved(ContainerEvent e) {
254 Component c = e.getChild();
255 if (c instanceof JMenu)
256 ((JMenu)c).getModel().removeChangeListener(changeListener);
257 }
258 }
259
260
261 private static class Actions extends UIAction {
262 private static final String TAKE_FOCUS = "takeFocus";
263
264 Actions(String key) {
265 super(key);
266 }
267
268 public void actionPerformed(ActionEvent e) {
269 // TAKE_FOCUS
270 JMenuBar menuBar = (JMenuBar)e.getSource();
271 MenuSelectionManager defaultManager = MenuSelectionManager.defaultManager();
272 MenuElement[] me;
273 MenuElement[] subElements;
274 JMenu menu = menuBar.getMenu(0);
275 if (menu!=null) {
276 me = new MenuElement[3];
277 me[0] = (MenuElement) menuBar;
278 me[1] = (MenuElement) menu;
279 me[2] = (MenuElement) menu.getPopupMenu();
280 defaultManager.setSelectedPath(me);
281 }
282 }
283 }
284 }