Java tutorial
/* * Copyright (c) 2001-2013 JGoodies Software GmbH. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * o Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * o Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * o Neither the name of JGoodies Software GmbH nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package com.jgoodies.looks; import java.awt.Color; import java.awt.Component; import java.util.Collections; import java.util.List; import javax.swing.LookAndFeel; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import com.jgoodies.common.base.SystemUtils; import com.jgoodies.looks.plastic.PlasticLookAndFeel; import com.jgoodies.looks.plastic.PlasticTheme; /** * Provides convenience behavior used by the JGoodies Looks. * * @author Karsten Lentzsch * @version $Revision: 1.18 $ */ public final class LookUtils extends SystemUtils { // Basics System Properties ********************************************** /** * True if this is Windows 98/ME/2000/Server 2003/XP/VISTA/Server 2008. */ public static final boolean IS_OS_WINDOWS_MODERN = startsWith(OS_NAME, "Windows") && !startsWith(OS_VERSION, "4.0"); /** * True if this is Windows 95. * * @since 2.0 */ public static final boolean IS_OS_WINDOWS_95 = startsWith(OS_NAME, "Windows 9") && startsWith(OS_VERSION, "4.0"); /** * True if this is Windows NT. * * @since 2.0 */ public static final boolean IS_OS_WINDOWS_NT = startsWith(OS_NAME, "Windows NT"); private static boolean loggingEnabled = true; private LookUtils() { // Override default constructor; prevents instantiation. } // Accessing System Configuration ***************************************** /** * Tries to look up the System property for the given key. * In untrusted environments this may throw a SecurityException. * In this case we catch the exception and answer {@code null}. * * @param key the name of the system property * @return the system property's String value, or {@code null} if there's * no such value, or a SecurityException has been caught */ public static String getSystemProperty(String key) { try { return System.getProperty(key); } catch (SecurityException e) { log("Can't read the System property " + key + "."); return null; } } /** * Tries to look up the System property for the given key. * In untrusted environments this may throw a SecurityException. * In this case, we catch the exception and answer the default value. * * @param key the name of the system property * @param defaultValue the default value if no property exists. * @return the system property's String value, or the defaultValue * if there's no such value, or a SecurityException has been caught */ public static String getSystemProperty(String key, String defaultValue) { try { return System.getProperty(key, defaultValue); } catch (SecurityException e) { log("Can't read the System property " + key + "."); return defaultValue; } } /** * Checks if a boolean system property has been set for the given key, * and returns the associated Boolean, or {@code null} if no value * has been set. The test for the property ignores case. * If a Boolean value has been set, a message is logged * with the given prefix. * * @param key the key used to lookup the system property value * @param logMessage a prefix used when a message is logged * @return {@code Boolean.TRUE} if the system property has been set to * "true" (case ignored), {@code Boolean.FALSE} if it has been set to * "false", {@code null} otherwise */ public static Boolean getBooleanSystemProperty(String key, String logMessage) { String value = getSystemProperty(key, ""); Boolean result; if (value.equalsIgnoreCase("false")) { result = Boolean.FALSE; } else if (value.equalsIgnoreCase("true")) { result = Boolean.TRUE; } else { result = null; } if (result != null) { LookUtils.log(logMessage + " have been " + (result.booleanValue() ? "en" : "dis") + "abled in the system properties."); } return result; } /** * Checks and answers whether we have a true color system. * * @param c the component used to determine the toolkit * @return true if the component's toolkit has a pixel size >= 24 */ public static boolean isTrueColor(Component c) { return c.getToolkit().getColorModel().getPixelSize() >= 24; } /** * Checks and answers whether this toolkit provides native drop shadows * for popups such as the Mac OS X. Currently this is used to * determine if the Looks' popup drop shadow feature is active or not * - even if it's enabled. * * @return true if the toolkit provides native drop shadows * * @see Options#isPopupDropShadowActive() */ public static boolean getToolkitUsesNativeDropShadows() { return IS_OS_MAC; } /** * Computes and returns a Color that is slightly brighter * than the specified Color. * * @param color the color used as basis for the brightened color * @return a slightly brighter color */ public static Color getSlightlyBrighter(Color color) { return getSlightlyBrighter(color, 1.1f); } /** * Computes and returns a Color that is slightly brighter * than the specified Color. * * @param color the color used as basis for the brightened color * @param factor the factor used to compute the brightness * @return a slightly brighter color */ public static Color getSlightlyBrighter(Color color, float factor) { float[] hsbValues = new float[3]; Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), hsbValues); float hue = hsbValues[0]; float saturation = hsbValues[1]; float brightness = hsbValues[2]; float newBrightness = Math.min(brightness * factor, 1.0f); return Color.getHSBColor(hue, saturation, newBrightness); } // Accessing Look, Theme, and Font Settings ***************************** public static void setLookAndTheme(LookAndFeel laf, Object theme) throws UnsupportedLookAndFeelException { if (laf instanceof PlasticLookAndFeel && theme != null && theme instanceof PlasticTheme) { PlasticLookAndFeel.setPlasticTheme((PlasticTheme) theme); } UIManager.setLookAndFeel(laf); } public static Object getDefaultTheme(LookAndFeel laf) { return laf instanceof PlasticLookAndFeel ? PlasticLookAndFeel.createMyDefaultTheme() : null; } public static List getInstalledThemes(LookAndFeel laf) { return laf instanceof PlasticLookAndFeel ? PlasticLookAndFeel.getInstalledThemes() : Collections.EMPTY_LIST; } // Minimal logging ****************************************************** /** * Enables or disables the Looks logging. * * @param enabled true to enable logging, false to disable it */ public static void setLoggingEnabled(boolean enabled) { loggingEnabled = enabled; } /** * Prints a new line to the console if logging is enabled. */ public static void log() { if (loggingEnabled) { System.out.println(); } } /** * Prints the given message to the console if logging is enabled. * * @param message the message to print */ public static void log(String message) { if (loggingEnabled) { System.out.println("JGoodies Looks: " + message); } } }