1 /*
2 * Copyright (c) 2003, 2009, 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 package sun.awt;
26
27 import java.awt.Component;
28 import java.awt.KeyboardFocusManager;
29 import java.awt.Window;
30 import java.awt.Canvas;
31 import java.awt.Scrollbar;
32 import java.awt.Panel;
33
34 import java.awt.event.FocusEvent;
35
36 import java.awt.peer.KeyboardFocusManagerPeer;
37 import java.awt.peer.ComponentPeer;
38
39 import java.lang.reflect.InvocationTargetException;
40 import java.lang.reflect.Method;
41
42 import sun.util.logging.PlatformLogger;
43
44 public abstract class KeyboardFocusManagerPeerImpl implements KeyboardFocusManagerPeer {
45
46 private static final PlatformLogger focusLog = PlatformLogger.getLogger("sun.awt.focus.KeyboardFocusManagerPeerImpl");
47
48 private static AWTAccessor.KeyboardFocusManagerAccessor kfmAccessor =
49 AWTAccessor.getKeyboardFocusManagerAccessor();
50
51 // The constants are copied from java.awt.KeyboardFocusManager
52 public static final int SNFH_FAILURE = 0;
53 public static final int SNFH_SUCCESS_HANDLED = 1;
54 public static final int SNFH_SUCCESS_PROCEED = 2;
55
56 @Override
57 public void clearGlobalFocusOwner(Window activeWindow) {
58 if (activeWindow != null) {
59 Component focusOwner = activeWindow.getFocusOwner();
60 if (focusLog.isLoggable(PlatformLogger.FINE))
61 focusLog.fine("Clearing global focus owner " + focusOwner);
62 if (focusOwner != null) {
63 FocusEvent fl = new CausedFocusEvent(focusOwner, FocusEvent.FOCUS_LOST, false, null,
64 CausedFocusEvent.Cause.CLEAR_GLOBAL_FOCUS_OWNER);
65 SunToolkit.postPriorityEvent(fl);
66 }
67 }
68 }
69
70 /*
71 * WARNING: Don't call it on the Toolkit thread.
72 *
73 * Checks if the component:
74 * 1) accepts focus on click (in general)
75 * 2) may be a focus owner (in particular)
76 */
77 @SuppressWarnings("deprecation")
78 public static boolean shouldFocusOnClick(Component component) {
79 boolean acceptFocusOnClick = false;
80
81 // A component is generally allowed to accept focus on click
82 // if its peer is focusable. There're some exceptions though.
83
84
85 // CANVAS & SCROLLBAR accept focus on click
86 if (component instanceof Canvas ||
87 component instanceof Scrollbar)
88 {
89 acceptFocusOnClick = true;
90
91 // PANEL, empty only, accepts focus on click
92 } else if (component instanceof Panel) {
93 acceptFocusOnClick = (((Panel)component).getComponentCount() == 0);
94
95
96 // Other components
97 } else {
98 ComponentPeer peer = (component != null ? component.getPeer() : null);
99 acceptFocusOnClick = (peer != null ? peer.isFocusable() : false);
100 }
101 return acceptFocusOnClick &&
102 AWTAccessor.getComponentAccessor().canBeFocusOwner(component);
103 }
104
105 /*
106 * Posts proper lost/gain focus events to the event queue.
107 */
108 @SuppressWarnings("deprecation")
109 public static boolean deliverFocus(Component lightweightChild,
110 Component target,
111 boolean temporary,
112 boolean focusedWindowChangeAllowed,
113 long time,
114 CausedFocusEvent.Cause cause,
115 Component currentFocusOwner) // provided by the descendant peers
116 {
117 if (lightweightChild == null) {
118 lightweightChild = target;
119 }
120
121 Component currentOwner = currentFocusOwner;
122 if (currentOwner != null && currentOwner.getPeer() == null) {
123 currentOwner = null;
124 }
125 if (currentOwner != null) {
126 FocusEvent fl = new CausedFocusEvent(currentOwner, FocusEvent.FOCUS_LOST,
127 false, lightweightChild, cause);
128
129 if (focusLog.isLoggable(PlatformLogger.FINER))
130 focusLog.finer("Posting focus event: " + fl);
131 SunToolkit.postPriorityEvent(fl);
132 }
133
134 FocusEvent fg = new CausedFocusEvent(lightweightChild, FocusEvent.FOCUS_GAINED,
135 false, currentOwner, cause);
136
137 if (focusLog.isLoggable(PlatformLogger.FINER))
138 focusLog.finer("Posting focus event: " + fg);
139 SunToolkit.postPriorityEvent(fg);
140 return true;
141 }
142
143 // WARNING: Don't call it on the Toolkit thread.
144 public static boolean requestFocusFor(Component target, CausedFocusEvent.Cause cause) {
145 return AWTAccessor.getComponentAccessor().requestFocus(target, cause);
146 }
147
148 // WARNING: Don't call it on the Toolkit thread.
149 public static int shouldNativelyFocusHeavyweight(Component heavyweight,
150 Component descendant,
151 boolean temporary,
152 boolean focusedWindowChangeAllowed,
153 long time,
154 CausedFocusEvent.Cause cause)
155 {
156 return kfmAccessor.shouldNativelyFocusHeavyweight(
157 heavyweight, descendant, temporary, focusedWindowChangeAllowed, time, cause);
158 }
159
160 public static void removeLastFocusRequest(Component heavyweight) {
161 kfmAccessor.removeLastFocusRequest(heavyweight);
162 }
163
164 // WARNING: Don't call it on the Toolkit thread.
165 public static boolean processSynchronousLightweightTransfer(Component heavyweight,
166 Component descendant,
167 boolean temporary,
168 boolean focusedWindowChangeAllowed,
169 long time)
170 {
171 return kfmAccessor.processSynchronousLightweightTransfer(
172 heavyweight, descendant, temporary, focusedWindowChangeAllowed, time);
173 }
174 }