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 protected KeyboardFocusManager manager;
57
58 public KeyboardFocusManagerPeerImpl(KeyboardFocusManager manager) {
59 this.manager = manager;
60 }
61
62 @Override
63 public void clearGlobalFocusOwner(Window activeWindow) {
64 if (activeWindow != null) {
65 Component focusOwner = activeWindow.getFocusOwner();
66 if (focusLog.isLoggable(PlatformLogger.FINE))
67 focusLog.fine("Clearing global focus owner " + focusOwner);
68 if (focusOwner != null) {
69 FocusEvent fl = new CausedFocusEvent(focusOwner, FocusEvent.FOCUS_LOST, false, null,
70 CausedFocusEvent.Cause.CLEAR_GLOBAL_FOCUS_OWNER);
71 SunToolkit.postPriorityEvent(fl);
72 }
73 }
74 }
75
76 /*
77 * WARNING: Don't call it on the Toolkit thread.
78 *
79 * Checks if the component:
80 * 1) accepts focus on click (in general)
81 * 2) may be a focus owner (in particular)
82 */
83 public static boolean shouldFocusOnClick(Component component) {
84 boolean acceptFocusOnClick = false;
85
86 // A component is generally allowed to accept focus on click
87 // if its peer is focusable. There're some exceptions though.
88
89
90 // CANVAS & SCROLLBAR accept focus on click
91 if (component instanceof Canvas ||
92 component instanceof Scrollbar)
93 {
94 acceptFocusOnClick = true;
95
96 // PANEL, empty only, accepts focus on click
97 } else if (component instanceof Panel) {
98 acceptFocusOnClick = (((Panel)component).getComponentCount() == 0);
99
100
101 // Other components
102 } else {
103 ComponentPeer peer = (component != null ? component.getPeer() : null);
104 acceptFocusOnClick = (peer != null ? peer.isFocusable() : false);
105 }
106 return acceptFocusOnClick &&
107 AWTAccessor.getComponentAccessor().canBeFocusOwner(component);
108 }
109
110 /*
111 * Posts proper lost/gain focus events to the event queue.
112 */
113 public static boolean deliverFocus(Component lightweightChild,
114 Component target,
115 boolean temporary,
116 boolean focusedWindowChangeAllowed,
117 long time,
118 CausedFocusEvent.Cause cause,
119 Component currentFocusOwner) // provided by the descendant peers
120 {
121 if (lightweightChild == null) {
122 lightweightChild = (Component)target;
123 }
124
125 Component currentOwner = currentFocusOwner;
126 if (currentOwner != null && currentOwner.getPeer() == null) {
127 currentOwner = null;
128 }
129 if (currentOwner != null) {
130 FocusEvent fl = new CausedFocusEvent(currentOwner, FocusEvent.FOCUS_LOST,
131 false, lightweightChild, cause);
132
133 if (focusLog.isLoggable(PlatformLogger.FINER))
134 focusLog.finer("Posting focus event: " + fl);
135 SunToolkit.postPriorityEvent(fl);
136 }
137
138 FocusEvent fg = new CausedFocusEvent(lightweightChild, FocusEvent.FOCUS_GAINED,
139 false, currentOwner, cause);
140
141 if (focusLog.isLoggable(PlatformLogger.FINER))
142 focusLog.finer("Posting focus event: " + fg);
143 SunToolkit.postPriorityEvent(fg);
144 return true;
145 }
146
147 // WARNING: Don't call it on the Toolkit thread.
148 public static boolean requestFocusFor(Component target, CausedFocusEvent.Cause cause) {
149 return AWTAccessor.getComponentAccessor().requestFocus(target, cause);
150 }
151
152 // WARNING: Don't call it on the Toolkit thread.
153 public static int shouldNativelyFocusHeavyweight(Component heavyweight,
154 Component descendant,
155 boolean temporary,
156 boolean focusedWindowChangeAllowed,
157 long time,
158 CausedFocusEvent.Cause cause)
159 {
160 return kfmAccessor.shouldNativelyFocusHeavyweight(
161 heavyweight, descendant, temporary, focusedWindowChangeAllowed, time, cause);
162 }
163
164 public static void removeLastFocusRequest(Component heavyweight) {
165 kfmAccessor.removeLastFocusRequest(heavyweight);
166 }
167
168 // WARNING: Don't call it on the Toolkit thread.
169 public static boolean processSynchronousLightweightTransfer(Component heavyweight,
170 Component descendant,
171 boolean temporary,
172 boolean focusedWindowChangeAllowed,
173 long time)
174 {
175 return kfmAccessor.processSynchronousLightweightTransfer(
176 heavyweight, descendant, temporary, focusedWindowChangeAllowed, time);
177 }
178 }