Source Code Cross Referenced for Utilities.java in  » Swing-Library » jgoodies-forms » com » jgoodies » forms » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » jgoodies forms » com.jgoodies.forms.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2002-2007 JGoodies Karsten Lentzsch. All Rights Reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without 
005:         * modification, are permitted provided that the following conditions are met:
006:         * 
007:         *  o Redistributions of source code must retain the above copyright notice, 
008:         *    this list of conditions and the following disclaimer. 
009:         *     
010:         *  o Redistributions in binary form must reproduce the above copyright notice, 
011:         *    this list of conditions and the following disclaimer in the documentation 
012:         *    and/or other materials provided with the distribution. 
013:         *     
014:         *  o Neither the name of JGoodies Karsten Lentzsch nor the names of 
015:         *    its contributors may be used to endorse or promote products derived 
016:         *    from this software without specific prior written permission. 
017:         *     
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
020:         * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
021:         * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
022:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
025:         * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026:         * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
027:         * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
028:         * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
029:         */
030:
031:        package com.jgoodies.forms.util;
032:
033:        import java.beans.PropertyChangeEvent;
034:        import java.beans.PropertyChangeListener;
035:
036:        import javax.swing.UIManager;
037:
038:        /**
039:         * Consists only of static utility methods.
040:         * 
041:         * This class may be merged with the FormLayoutUtils extra - or not. * 
042:         *
043:         * @author Karsten Lentzsch
044:         * @version $Revision: 1.4 $
045:         */
046:        public final class Utilities {
047:
048:            // Instance *************************************************************
049:
050:            private Utilities() {
051:                // Suppresses default constructor, ensuring non-instantiability.
052:            }
053:
054:            /**
055:             * Lazily checks and answers whether the Aqua look&feel is active.
056:             * 
057:             * @return true if the current look&feel is Aqua
058:             */
059:            public static boolean isLafAqua() {
060:                if (cachedIsLafAqua == null) {
061:                    cachedIsLafAqua = Boolean.valueOf(computeIsLafAqua());
062:                    ensureLookAndFeelChangeHandlerRegistered();
063:                }
064:                return cachedIsLafAqua.booleanValue();
065:            }
066:
067:            // Caching and Lazily Computing the Laf State *****************************
068:
069:            /**
070:             * Holds the cached result of the Aqua l&f check.
071:             * Is invalidated by the <code>LookAndFeelChangeHandler</code>
072:             * if the look&amp;feel changes.
073:             */
074:            private static Boolean cachedIsLafAqua;
075:
076:            /**
077:             * Describes whether the <code>LookAndFeelChangeHandler</code>
078:             * has been registered with the <code>UIManager</code> or not.
079:             * It is registered lazily when the first cached l&amp;f state is computed.
080:             */
081:            private static boolean lafChangeHandlerRegistered = false;
082:
083:            private static synchronized void ensureLookAndFeelChangeHandlerRegistered() {
084:                if (!lafChangeHandlerRegistered) {
085:                    UIManager
086:                            .addPropertyChangeListener(new LookAndFeelChangeHandler());
087:                    lafChangeHandlerRegistered = true;
088:                }
089:            }
090:
091:            /**
092:             * Computes and answers whether an Aqua look&amp;feel is active.
093:             * This may be Apple's Aqua L&amp;f, or a sub-L&amp;f that
094:             * uses the same ID, because it doesn't substantially change the look.
095:             * 
096:             * @return true if the current look&amp;feel is Aqua
097:             */
098:            private static boolean computeIsLafAqua() {
099:                return UIManager.getLookAndFeel().getID().equals("Aqua");
100:            }
101:
102:            /**
103:             * Listens to changes of the Look and Feel and invalidates the cache.
104:             */
105:            private static final class LookAndFeelChangeHandler implements 
106:                    PropertyChangeListener {
107:
108:                /**
109:                 * Invalidates the cached laf states, if the UIManager has fired 
110:                 * any property change event. Since we need to handle look&amp;feel 
111:                 * changes only, we check the event's property name to be 
112:                 * "lookAndFeel" or <code>null</code>. The check for null is necessary
113:                 * to handle the special event where property name, old and new value
114:                 * are all <code>null</code> to indicate that multiple properties
115:                 * have changed.
116:                 * 
117:                 * @param evt  describes the property change
118:                 */
119:                public void propertyChange(PropertyChangeEvent evt) {
120:                    String propertyName = evt.getPropertyName();
121:                    if ((propertyName == null)
122:                            || propertyName.equals("lookAndFeel")) {
123:                        cachedIsLafAqua = null;
124:                    }
125:                }
126:            }
127:
128:        }
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