Source Code Cross Referenced for DefaultFocusTraversalPolicy.java in  » 6.0-JDK-Modules » j2me » java » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.awt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * 
003:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
004:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
005:         * 
006:         * This program is free software; you can redistribute it and/or
007:         * modify it under the terms of the GNU General Public License version
008:         * 2 only, as published by the Free Software Foundation. 
009:         * 
010:         * This program is distributed in the hope that it will be useful, but
011:         * WITHOUT ANY WARRANTY; without even the implied warranty of
012:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
013:         * General Public License version 2 for more details (a copy is
014:         * included at /legal/license.txt). 
015:         * 
016:         * You should have received a copy of the GNU General Public License
017:         * version 2 along with this work; if not, write to the Free Software
018:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
019:         * 02110-1301 USA 
020:         * 
021:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
022:         * Clara, CA 95054 or visit www.sun.com if you need additional
023:         * information or have any questions. 
024:         */
025:        package java.awt;
026:
027:        /**
028:         * A FocusTraversalPolicy that determines traversal order based on the order
029:         * of child Components in a Container. From a particular focus cycle root, the
030:         * policy makes a pre-order traversal of the Component hierarchy, and traverses
031:         * a Container's children according to the ordering of the array returned by
032:         * <code>Container.getComponents()</code>. Portions of the hierarchy that are
033:         * not visible and displayable will not be searched.
034:         * <p>
035:         * If client code has explicitly set the focusability of a Component by either
036:         * overriding <code>Component.isFocusTraversable()</code> or
037:         * <code>Component.isFocusable()</code>, or by calling
038:         * <code>Component.setFocusable()</code>, then a DefaultFocusTraversalPolicy
039:         * behaves exactly like a ContainerOrderFocusTraversalPolicy. If, however, the
040:         * Component is relying on default focusability, then a
041:         * DefaultFocusTraversalPolicy will reject all Components with non-focusable
042:         * peers. This is the default FocusTraversalPolicy for all AWT Containers.
043:         * <p>
044:         * The focusability of a peer is implementation-dependent. Sun recommends that
045:         * all implementations for a particular native platform construct peers with
046:         * the same focusability. The recommendations for Windows and Unix are that
047:         * Canvases, Labels, Panels, Scrollbars, ScrollPanes, Windows, and lightweight
048:         * Components have non-focusable peers, and all other Components have focusable
049:         * peers. These recommendations are used in the Sun AWT implementations. Note
050:         * that the focusability of a Component's peer is different from, and does not
051:         * impact, the focusability of the Component itself.
052:         *
053:         * @author David Mendenhall
054:         * @version 1.3, 01/23/03
055:         *
056:         * @see Container#getComponents
057:         * @see Component#isFocusable
058:         * @see Component#setFocusable
059:         * @since 1.4
060:         */
061:        public class DefaultFocusTraversalPolicy extends
062:                ContainerOrderFocusTraversalPolicy {
063:            /**
064:             * Determines whether a Component is an acceptable choice as the new
065:             * focus owner. The Component must be visible, displayable, and enabled
066:             * to be accepted. If client code has explicitly set the focusability
067:             * of the Component by either overriding
068:             * <code>Component.isFocusTraversable()</code> or
069:             * <code>Component.isFocusable()</code>, or by calling
070:             * <code>Component.setFocusable()</code>, then the Component will be
071:             * accepted if and only if it is focusable. If, however, the Component is
072:             * relying on default focusability, then all Canvases, Labels, Panels,
073:             * Scrollbars, ScrollPanes, Windows, and lightweight Components will be
074:             * rejected.
075:             *
076:             * @param aComponent the Component whose fitness as a focus owner is to
077:             *        be tested
078:             * @return <code>true</code> if aComponent meets the above requirements;
079:             *         <code>false</code> otherwise
080:             */
081:            protected boolean accept(Component aComponent) {
082:                if (!(aComponent.isVisible() && aComponent.isDisplayable() && aComponent
083:                        .isEnabled())) {
084:                    return false;
085:                }
086:                // Verify that the Component is recursively enabled. Disabling a
087:                // heavyweight Container disables its children, whereas disabling
088:                // a lightweight Container does not.
089:                if (!(aComponent instanceof  Window)) {
090:                    for (Container enableTest = aComponent.getParent(); enableTest != null; enableTest = enableTest
091:                            .getParent()) {
092:                        if (!(enableTest.isEnabled() || enableTest
093:                                .isLightweight())) {
094:                            return false;
095:                        }
096:                        if (enableTest instanceof  Window) {
097:                            break;
098:                        }
099:                    }
100:                }
101:                boolean focusable = aComponent.isFocusable();
102:                if (aComponent.isFocusTraversableOverridden()) {
103:                    return focusable;
104:                }
105:                sun.awt.peer.ComponentPeer peer = aComponent.peer;
106:                return (peer != null && peer.isFocusTraversable());
107:            }
108:        }
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