Source Code Cross Referenced for CheckboxGroup.java in  » 6.0-JDK-Core » AWT » java » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001        /*
002         * Copyright 1995-2004 Sun Microsystems, Inc.  All Rights Reserved.
003         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004         *
005         * This code is free software; you can redistribute it and/or modify it
006         * under the terms of the GNU General Public License version 2 only, as
007         * published by the Free Software Foundation.  Sun designates this
008         * particular file as subject to the "Classpath" exception as provided
009         * by Sun in the LICENSE file that accompanied this code.
010         *
011         * This code is distributed in the hope that it will be useful, but WITHOUT
012         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014         * version 2 for more details (a copy is included in the LICENSE file that
015         * accompanied this code).
016         *
017         * You should have received a copy of the GNU General Public License version
018         * 2 along with this work; if not, write to the Free Software Foundation,
019         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020         *
021         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022         * CA 95054 USA or visit www.sun.com if you need additional information or
023         * have any questions.
024         */
025        package java.awt;
026
027        /**
028         * The <code>CheckboxGroup</code> class is used to group together 
029         * a set of <code>Checkbox</code> buttons. 
030         * <p>
031         * Exactly one check box button in a <code>CheckboxGroup</code> can 
032         * be in the "on" state at any given time. Pushing any 
033         * button sets its state to "on" and forces any other button that 
034         * is in the "on" state into the "off" state. 
035         * <p>
036         * The following code example produces a new check box group,
037         * with three check boxes: 
038         * <p>
039         * <hr><blockquote><pre>
040         * setLayout(new GridLayout(3, 1));
041         * CheckboxGroup cbg = new CheckboxGroup();
042         * add(new Checkbox("one", cbg, true));
043         * add(new Checkbox("two", cbg, false));
044         * add(new Checkbox("three", cbg, false));
045         * </pre></blockquote><hr>
046         * <p>
047         * This image depicts the check box group created by this example:
048         * <p>
049         * <img src="doc-files/CheckboxGroup-1.gif" 
050         * alt="Shows three checkboxes, arranged vertically, labeled one, two, and three. Checkbox one is in the on state."
051         * ALIGN=center HSPACE=10 VSPACE=7> 
052         * <p>
053         * @version 	1.43 05/05/07
054         * @author 	Sami Shaio
055         * @see         java.awt.Checkbox
056         * @since       JDK1.0
057         */
058        public class CheckboxGroup implements  java.io.Serializable {
059            /**
060             * The current choice.
061             * @serial
062             * @see #getCurrent()
063             * @see #setCurrent(Checkbox)
064             */
065            Checkbox selectedCheckbox = null;
066
067            /*
068             * JDK 1.1 serialVersionUID 
069             */
070            private static final long serialVersionUID = 3729780091441768983L;
071
072            /**
073             * Creates a new instance of <code>CheckboxGroup</code>. 
074             */
075            public CheckboxGroup() {
076            }
077
078            /**
079             * Gets the current choice from this check box group.
080             * The current choice is the check box in this  
081             * group that is currently in the "on" state, 
082             * or <code>null</code> if all check boxes in the
083             * group are off.
084             * @return   the check box that is currently in the
085             *                 "on" state, or <code>null</code>.
086             * @see      java.awt.Checkbox
087             * @see      java.awt.CheckboxGroup#setSelectedCheckbox
088             * @since    JDK1.1
089             */
090            public Checkbox getSelectedCheckbox() {
091                return getCurrent();
092            }
093
094            /**
095             * @deprecated As of JDK version 1.1,
096             * replaced by <code>getSelectedCheckbox()</code>.
097             */
098            @Deprecated
099            public Checkbox getCurrent() {
100                return selectedCheckbox;
101            }
102
103            /**
104             * Sets the currently selected check box in this group
105             * to be the specified check box.
106             * This method sets the state of that check box to "on" and 
107             * sets all other check boxes in the group to be off.
108             * <p>
109             * If the check box argument is <tt>null</tt>, all check boxes 
110             * in this check box group are deselected. If the check box argument 
111             * belongs to a different check box group, this method does 
112             * nothing. 
113             * @param     box   the <code>Checkbox</code> to set as the
114             *                      current selection.
115             * @see      java.awt.Checkbox
116             * @see      java.awt.CheckboxGroup#getSelectedCheckbox
117             * @since    JDK1.1
118             */
119            public void setSelectedCheckbox(Checkbox box) {
120                setCurrent(box);
121            }
122
123            /**
124             * @deprecated As of JDK version 1.1,
125             * replaced by <code>setSelectedCheckbox(Checkbox)</code>.
126             */
127            @Deprecated
128            public synchronized void setCurrent(Checkbox box) {
129                if (box != null && box.group != this ) {
130                    return;
131                }
132                Checkbox oldChoice = this .selectedCheckbox;
133                this .selectedCheckbox = box;
134                if (oldChoice != null && oldChoice != box
135                        && oldChoice.group == this ) {
136                    oldChoice.setState(false);
137                }
138                if (box != null && oldChoice != box && !box.getState()) {
139                    box.setStateInternal(true);
140                }
141            }
142
143            /**
144             * Returns a string representation of this check box group,
145             * including the value of its current selection.
146             * @return    a string representation of this check box group.
147             */
148            public String toString() {
149                return getClass().getName() + "[selectedCheckbox="
150                        + selectedCheckbox + "]";
151            }
152
153        }
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