This property is changed * when the system tray becomes available or unavailable on the desktop.<br> * The property is accessed by the {@link #getSystemTray} method.</td> * </tr> * </table> * <p> * The {@code listener} listens to property changes only in this context. * <p> * If {@code listener} is {@code null}, no exception is thrown * and no action is performed. * * @param propertyName the specified property * @param listener the property change listener to be added * * @see #removePropertyChangeListener * @see #getPropertyChangeListeners */ public synchronized void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) { if (listener == null) { return; } getCurrentChangeSupport().addPropertyChangeListener(propertyName, listener); } /** * Removes a {@code PropertyChangeListener} from the listener list * for a specific property. * <p> * The {@code PropertyChangeListener} must be from this context. * <p> * If {@code propertyName} or {@code listener} is {@code null} or invalid, * no exception is thrown and no action is taken. * * @param propertyName the specified property * @param listener the PropertyChangeListener to be removed * * @see #addPropertyChangeListener * @see #getPropertyChangeListeners */ public synchronized void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) { if (listener == null) { return; } getCurrentChangeSupport().removePropertyChangeListener(propertyName, listener); } /** * Returns an array of all the listeners that have been associated * with the named property. * <p> * Only the listeners in this context are returned. * * @param propertyName the specified property * @return all of the {@code PropertyChangeListener}s associated with * the named property; if no such listeners have been added or * if {@code propertyName} is {@code null} or invalid, an empty * array is returned * * @see #addPropertyChangeListener * @see #removePropertyChangeListener */ public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName) { return getCurrentChangeSupport().getPropertyChangeListeners(propertyName); } // *************************************************************** // *************************************************************** /** * Support for reporting bound property changes for Object properties. * This method can be called when a bound property has changed and it will * send the appropriate PropertyChangeEvent to any registered * PropertyChangeListeners. * * @param propertyName the property whose value has changed * @param oldValue the property's previous value * @param newValue the property's new value */ private void firePropertyChange(String propertyName, Object oldValue, Object newValue) { if (oldValue != null && newValue != null && oldValue.equals(newValue)) { return; } getCurrentChangeSupport().firePropertyChange(propertyName, oldValue, newValue); } /** * Returns the current PropertyChangeSupport instance for the * calling thread's context. * * @return this thread's context's PropertyChangeSupport */ private synchronized PropertyChangeSupport getCurrentChangeSupport() { PropertyChangeSupport changeSupport = (PropertyChangeSupport)AppContext.getAppContext().get(SystemTray.class); if (changeSupport == null) { changeSupport = new PropertyChangeSupport(this); AppContext.getAppContext().put(SystemTray.class, changeSupport); } return changeSupport; } synchronized void addNotify() { if (peer == null) { Toolkit toolkit = Toolkit.getDefaultToolkit(); if (toolkit instanceof SunToolkit) { peer = ((SunToolkit)Toolkit.getDefaultToolkit()).createSystemTray(this); } else if (toolkit instanceof HeadlessToolkit) { peer = ((HeadlessToolkit)Toolkit.getDefaultToolkit()).createSystemTray(this); } } } static void checkSystemTrayAllowed() { SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkPermission(SecurityConstants.AWT.ACCESS_SYSTEM_TRAY_PERMISSION); } } private static void initializeSystemTrayIfNeeded() { synchronized (SystemTray.class) { if (systemTray == null) { systemTray = new SystemTray(); } } } }
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Java example source code file (SystemTray.java)
The SystemTray.java Java example source code/*
* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package java.awt;
import java.util.Vector;
import java.awt.peer.SystemTrayPeer;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import sun.awt.AppContext;
import sun.awt.SunToolkit;
import sun.awt.HeadlessToolkit;
import sun.security.util.SecurityConstants;
import sun.awt.AWTAccessor;
/**
* The <code>SystemTray class represents the system tray for a
* desktop. On Microsoft Windows it is referred to as the "Taskbar
* Status Area", on Gnome it is referred to as the "Notification
* Area", on KDE it is referred to as the "System Tray". The system
* tray is shared by all applications running on the desktop.
*
* <p> On some platforms the system tray may not be present or may not
* be supported, in this case {@link SystemTray#getSystemTray()}
* throws {@link UnsupportedOperationException}. To detect whether the
* system tray is supported, use {@link SystemTray#isSupported}.
*
* <p>The |
