Source Code Cross Referenced for FocusEvent.java in  » 6.0-JDK-Modules » j2me » java » awt » event » 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.event 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)FocusEvent.java	1.26 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation. 
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt). 
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA 
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package java.awt.event;
029:
030:        import java.awt.Component;
031:        import sun.awt.AppContext;
032:        import sun.awt.SunToolkit;
033:
034:        /**
035:         * The component-level focus event.
036:         * There are two levels of focus change events: permanent and temporary.
037:         * Permanent focus change events occur when focus is directly moved
038:         * from one component to another, such as through calls to requestFocus()
039:         * or as the user uses the Tab key to traverse components.
040:         * Temporary focus change events occur when focus is temporarily
041:         * gained or lost for a component as the indirect result of another
042:         * operation, such as window deactivation or a scrollbar drag.  In this
043:         * case, the original focus state will automatically be restored once
044:         * that operation is finished, or, for the case of window deactivation,
045:         * when the window is reactivated.  Both permanent and temporary focus
046:         * events are delivered using the FOCUS_GAINED and FOCUS_LOST event ids;
047:         * the levels may be distinguished in the event using the isTemporary()
048:         * method.
049:         *  
050:         * @version 1.20 08/19/02
051:         * @author Carl Quinn
052:         * @author Amy Fowler
053:         */
054:        public class FocusEvent extends ComponentEvent {
055:            /**
056:             * Marks the first integer id for the range of focus event ids.
057:             */
058:            public static final int FOCUS_FIRST = 1004;
059:            /**
060:             * Marks the last integer id for the range of focus event ids.
061:             */
062:            public static final int FOCUS_LAST = 1005;
063:            /**
064:             * The focus gained event type.  
065:             */
066:            public static final int FOCUS_GAINED = FOCUS_FIRST; //Event.GOT_FOCUS
067:            /**
068:             * The focus lost event type.  
069:             */
070:            public static final int FOCUS_LOST = 1 + FOCUS_FIRST; //Event.LOST_FOCUS
071:            boolean temporary = false;
072:            /*
073:             * JDK 1.1 serialVersionUID 
074:             */
075:            private static final long serialVersionUID = 523753786457416396L;
076:
077:            transient Component opposite;
078:
079:            /**
080:             * Constructs a FocusEvent object with the specified source component,
081:             * type, and whether or not the focus event is a temporary level event.
082:             * @param source the object where the event originated
083:             * @id the event type
084:             * @temporary whether or not this focus change is temporary
085:             */
086:            public FocusEvent(Component source, int id, boolean temporary) {
087:                super (source, id);
088:                this .temporary = temporary;
089:            }
090:
091:            /**
092:             * Constructs a permanent-level FocusEvent object with the 
093:             * specified source component and type.
094:             * @param source the object where the event originated
095:             * @id the event type
096:             */
097:            public FocusEvent(Component source, int id) {
098:                this (source, id, false);
099:            }
100:
101:            public FocusEvent(Component source, int id, boolean temporary,
102:                    Component opposite) {
103:                super (source, id);
104:                this .temporary = temporary;
105:                this .opposite = opposite;
106:            }
107:
108:            /**
109:             * Returns whether or not this focus change event is a temporary
110:             * change.
111:             */
112:            public boolean isTemporary() {
113:                return temporary;
114:            }
115:
116:            public Component getOppositeComponent() {
117:                if (opposite == null) {
118:                    return null;
119:                }
120:                return (SunToolkit.targetToAppContext(opposite) == AppContext
121:                        .getAppContext()) ? opposite : null;
122:            }
123:
124:            public String paramString() {
125:                String typeStr;
126:                switch (id) {
127:                case FOCUS_GAINED:
128:                    typeStr = "FOCUS_GAINED";
129:                    break;
130:
131:                case FOCUS_LOST:
132:                    typeStr = "FOCUS_LOST";
133:                    break;
134:
135:                default:
136:                    typeStr = "unknown type";
137:                }
138:                return typeStr + (temporary ? ",temporary" : ",permanent")
139:                        + ",opposite=" + getOppositeComponent();
140:            }
141:        }
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