Package java.awt

Source Code of java.awt.TrayIcon

/*
* Copyright (c) 2005, 2006, 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.
*
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package java.awt;

import java.awt.Point;
import java.awt.Toolkit;
import java.awt.GraphicsEnvironment;
import java.awt.event.*;
import java.awt.AWTEvent;
import java.awt.AWTEventMulticaster;
import java.awt.EventQueue;
import java.awt.PopupMenu;
import java.awt.Image;
import java.util.EventListener;
import java.awt.peer.TrayIconPeer;
import sun.awt.AppContext;
import sun.awt.SunToolkit;
import java.util.EventObject;

/**
* A <code>TrayIcon</code> object represents a tray icon that can be
* added to the {@link SystemTray system tray}. A
* <code>TrayIcon</code> can have a tooltip (text), an image, a popup
* menu, and a set of listeners associated with it.
*
* <p>A <code>TrayIcon</code> can generate various {@link MouseEvent
* MouseEvents} and supports adding corresponding listeners to receive
* notification of these events.  <code>TrayIcon</code> processes some
* of the events by itself.  For example, by default, when the
* right-mouse click is performed on the <code>TrayIcon</code> it
* displays the specified popup menu.  When the mouse hovers
* over the <code>TrayIcon</code> the tooltip is displayed.
*
* <p><strong>Note:</strong> When the <code>MouseEvent</code> is
* dispatched to its registered listeners its <code>component</code>
* property will be set to <code>null</code>.  (See {@link
* java.awt.event.ComponentEvent#getComponent}) The
* <code>source</code> property will be set to this
* <code>TrayIcon</code>. (See {@link
* java.util.EventObject#getSource})
*
* <p><b>Note:</b> A well-behaved {@link TrayIcon} implementation
* will assign different gestures to showing a popup menu and
* selecting a tray icon.
*
* <p>A <code>TrayIcon</code> can generate an {@link ActionEvent
* ActionEvent}.  On some platforms, this occurs when the user selects
* the tray icon using either the mouse or keyboard.
*
* <p>If a SecurityManager is installed, the AWTPermission
* {@code accessSystemTray} must be granted in order to create
* a {@code TrayIcon}. Otherwise the constructor will throw a
* SecurityException.
*
* <p> See the {@link SystemTray} class overview for an example on how
* to use the <code>TrayIcon</code> API.
*
* @since 1.6
* @see SystemTray#add
* @see java.awt.event.ComponentEvent#getComponent
* @see java.util.EventObject#getSource
*
* @author Bino George
* @author Denis Mikhalkin
* @author Sharon Zakhour
* @author Anton Tarasov
*/
public class TrayIcon {
    private Image image;
    private String tooltip;
    private PopupMenu popup;
    private boolean autosize;
    private int id;
    private String actionCommand;

    transient private TrayIconPeer peer;

    transient MouseListener mouseListener;
    transient MouseMotionListener mouseMotionListener;
    transient ActionListener actionListener;

    static {
        Toolkit.loadLibraries();
        if (!GraphicsEnvironment.isHeadless()) {
            initIDs();
        }
    }

    private TrayIcon()
      throws UnsupportedOperationException, HeadlessException, SecurityException
    {
        SystemTray.checkSystemTrayAllowed();
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
        if (!SystemTray.isSupported()) {
            throw new UnsupportedOperationException();
        }
        SunToolkit.insertTargetMapping(this, AppContext.getAppContext());
    }

    /**
     * Creates a <code>TrayIcon</code> with the specified image.
     *
     * @param image the <code>Image</code> to be used
     * @throws IllegalArgumentException if <code>image</code> is
     * <code>null</code>
     * @throws UnsupportedOperationException if the system tray isn't
     * supported by the current platform
     * @throws HeadlessException if
     * {@code GraphicsEnvironment.isHeadless()} returns {@code true}
     * @throws SecurityException if {@code accessSystemTray} permission
     * is not granted
     * @see SystemTray#add(TrayIcon)
     * @see TrayIcon#TrayIcon(Image, String, PopupMenu)
     * @see TrayIcon#TrayIcon(Image, String)
     * @see SecurityManager#checkPermission
     * @see AWTPermission
     */
    public TrayIcon(Image image) {
        this();
        if (image == null) {
            throw new IllegalArgumentException("creating TrayIcon with null Image");
        }
        setImage(image);
    }

    /**
     * Creates a <code>TrayIcon</code> with the specified image and
     * tooltip text.
     *
     * @param image the <code>Image</code> to be used
     * @param tooltip the string to be used as tooltip text; if the
     * value is <code>null</code> no tooltip is shown
     * @throws IllegalArgumentException if <code>image</code> is
     * <code>null</code>
     * @throws UnsupportedOperationException if the system tray isn't
     * supported by the current platform
     * @throws HeadlessException if
     * {@code GraphicsEnvironment.isHeadless()} returns {@code true}
     * @throws SecurityException if {@code accessSystemTray} permission
     * is not granted
     * @see SystemTray#add(TrayIcon)
     * @see TrayIcon#TrayIcon(Image)
     * @see TrayIcon#TrayIcon(Image, String, PopupMenu)
     * @see SecurityManager#checkPermission
     * @see AWTPermission
     */
    public TrayIcon(Image image, String tooltip) {
        this(image);
        setToolTip(tooltip);
    }

    /**
     * Creates a <code>TrayIcon</code> with the specified image,
     * tooltip and popup menu.
     *
     * @param image the <code>Image</code> to be used
     * @param tooltip the string to be used as tooltip text; if the
     * value is <code>null</code> no tooltip is shown
     * @param popup the menu to be used for the tray icon's popup
     * menu; if the value is <code>null</code> no popup menu is shown
     * @throws IllegalArgumentException if <code>image</code> is <code>null</code>
     * @throws UnsupportedOperationException if the system tray isn't
     * supported by the current platform
     * @throws HeadlessException if
     * {@code GraphicsEnvironment.isHeadless()} returns {@code true}
     * @throws SecurityException if {@code accessSystemTray} permission
     * is not granted
     * @see SystemTray#add(TrayIcon)
     * @see TrayIcon#TrayIcon(Image, String)
     * @see TrayIcon#TrayIcon(Image)
     * @see PopupMenu
     * @see MouseListener
     * @see #addMouseListener(MouseListener)
     * @see SecurityManager#checkPermission
     * @see AWTPermission
     */
    public TrayIcon(Image image, String tooltip, PopupMenu popup) {
        this(image, tooltip);
        setPopupMenu(popup);
    }

    /**
     * Sets the image for this <code>TrayIcon</code>.  The previous
     * tray icon image is discarded without calling the {@link
     * java.awt.Image#flush} method &#151; you will need to call it
     * manually.
     *
     * <p> If the image represents an animated image, it will be
     * animated automatically.
     *
     * <p> See the {@link #setImageAutoSize(boolean)} property for
     * details on the size of the displayed image.
     *
     * <p> Calling this method with the same image that is currently
     * being used has no effect.
     *
     * @throws NullPointerException if <code>image</code> is <code>null</code>
     * @param image the non-null <code>Image</code> to be used
     * @see #getImage
     * @see Image
     * @see SystemTray#add(TrayIcon)
     * @see TrayIcon#TrayIcon(Image, String)
     */
    public void setImage(Image image) {
        if (image == null) {
            throw new NullPointerException("setting null Image");
        }
        this.image = image;

        TrayIconPeer peer = this.peer;
        if (peer != null) {
            peer.updateImage();
        }
    }

    /**
     * Returns the current image used for this <code>TrayIcon</code>.
     *
     * @return the image
     * @see #setImage(Image)
     * @see Image
     */
    public Image getImage() {
        return image;
    }

    /**
     * Sets the popup menu for this <code>TrayIcon</code>.  If
     * <code>popup</code> is <code>null</code>, no popup menu will be
     * associated with this <code>TrayIcon</code>.
     *
     * <p>Note that this <code>popup</code> must not be added to any
     * parent before or after it is set on the tray icon.  If you add
     * it to some parent, the <code>popup</code> may be removed from
     * that parent.
     *
     * <p>The {@code popup} can be set on one {@code TrayIcon} only.
     * Setting the same popup on multiple {@code TrayIcon}s will cause
     * an {@code IllegalArgumentException}.
     *
     * <p><strong>Note:</strong> Some platforms may not support
     * showing the user-specified popup menu component when the user
     * right-clicks the tray icon.  In this situation, either no menu
     * will be displayed or, on some systems, a native version of the
     * menu may be displayed.
     *
     * @throws IllegalArgumentException if the {@code popup} is already
     * set for another {@code TrayIcon}
     * @param popup a <code>PopupMenu</code> or <code>null</code> to
     * remove any popup menu
     * @see #getPopupMenu
     */
    public void setPopupMenu(PopupMenu popup) {
        if (popup == this.popup) {
            return;
        }
        synchronized (TrayIcon.class) {
            if (popup != null) {
                if (popup.isTrayIconPopup) {
                    throw new IllegalArgumentException("the PopupMenu is already set for another TrayIcon");
                }
                popup.isTrayIconPopup = true;
            }
            if (this.popup != null) {
                this.popup.isTrayIconPopup = false;
            }
            this.popup = popup;
        }
    }

    /**
     * Returns the popup menu associated with this <code>TrayIcon</code>.
     *
     * @return the popup menu or <code>null</code> if none exists
     * @see #setPopupMenu(PopupMenu)
     */
    public PopupMenu getPopupMenu() {
        return popup;
    }

    /**
     * Sets the tooltip string for this <code>TrayIcon</code>. The
     * tooltip is displayed automatically when the mouse hovers over
     * the icon.  Setting the tooltip to <code>null</code> removes any
     * tooltip text.
     *
     * When displayed, the tooltip string may be truncated on some platforms;
     * the number of characters that may be displayed is platform-dependent.
     *
     * @param tooltip the string for the tooltip; if the value is
     * <code>null</code> no tooltip is shown
     * @see #getToolTip
     */
    public void setToolTip(String tooltip) {
        this.tooltip = tooltip;

        TrayIconPeer peer = this.peer;
        if (peer != null) {
            peer.setToolTip(tooltip);
        }
    }

    /**
     * Returns the tooltip string associated with this
     * <code>TrayIcon</code>.
     *
     * @return the tooltip string or <code>null</code> if none exists
     * @see #setToolTip(String)
     */
    public String getToolTip() {
        return tooltip;
    }

    /**
     * Sets the auto-size property.  Auto-size determines whether the
     * tray image is automatically sized to fit the space allocated
     * for the image on the tray.  By default, the auto-size property
     * is set to <code>false</code>.
     *
     * <p> If auto-size is <code>false</code>, and the image size
     * doesn't match the tray icon space, the image is painted as-is
     * inside that space &#151; if larger than the allocated space, it will
     * be cropped.
     *
     * <p> If auto-size is <code>true</code>, the image is stretched or shrunk to
     * fit the tray icon space.
     *
     * @param autosize <code>true</code> to auto-size the image,
     * <code>false</code> otherwise
     * @see #isImageAutoSize
     */
    public void setImageAutoSize(boolean autosize) {
        this.autosize = autosize;

        TrayIconPeer peer = this.peer;
        if (peer != null) {
            peer.updateImage();
        }
    }

    /**
     * Returns the value of the auto-size property.
     *
     * @return <code>true</code> if the image will be auto-sized,
     * <code>false</code> otherwise
     * @see #setImageAutoSize(boolean)
     */
    public boolean isImageAutoSize() {
        return autosize;
    }

    /**
     * Adds the specified mouse listener to receive mouse events from
     * this <code>TrayIcon</code>.  Calling this method with a
     * <code>null</code> value has no effect.
     *
     * <p><b>Note</b>: The {@code MouseEvent}'s coordinates (received
     * from the {@code TrayIcon}) are relative to the screen, not the
     * {@code TrayIcon}.
     *
     * <p> <b>Note: </b>The <code>MOUSE_ENTERED</code> and
     * <code>MOUSE_EXITED</code> mouse events are not supported.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param    listener the mouse listener
     * @see      java.awt.event.MouseEvent
     * @see      java.awt.event.MouseListener
     * @see      #removeMouseListener(MouseListener)
     * @see      #getMouseListeners
     */
    public synchronized void addMouseListener(MouseListener listener) {
        if (listener == null) {
            return;
        }
        mouseListener = AWTEventMulticaster.add(mouseListener, listener);
    }

    /**
     * Removes the specified mouse listener.  Calling this method with
     * <code>null</code> or an invalid value has no effect.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param    listener   the mouse listener
     * @see      java.awt.event.MouseEvent
     * @see      java.awt.event.MouseListener
     * @see      #addMouseListener(MouseListener)
     * @see      #getMouseListeners
     */
    public synchronized void removeMouseListener(MouseListener listener) {
        if (listener == null) {
            return;
        }
        mouseListener = AWTEventMulticaster.remove(mouseListener, listener);
    }

    /**
     * Returns an array of all the mouse listeners
     * registered on this <code>TrayIcon</code>.
     *
     * @return all of the <code>MouseListeners</code> registered on
     * this <code>TrayIcon</code> or an empty array if no mouse
     * listeners are currently registered
     *
     * @see      #addMouseListener(MouseListener)
     * @see      #removeMouseListener(MouseListener)
     * @see      java.awt.event.MouseListener
     */
    public synchronized MouseListener[] getMouseListeners() {
        return (MouseListener[])(getListeners(MouseListener.class));
    }

    /**
     * Adds the specified mouse listener to receive mouse-motion
     * events from this <code>TrayIcon</code>.  Calling this method
     * with a <code>null</code> value has no effect.
     *
     * <p><b>Note</b>: The {@code MouseEvent}'s coordinates (received
     * from the {@code TrayIcon}) are relative to the screen, not the
     * {@code TrayIcon}.
     *
     * <p> <b>Note: </b>The <code>MOUSE_DRAGGED</code> mouse event is not supported.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param    listener   the mouse listener
     * @see      java.awt.event.MouseEvent
     * @see      java.awt.event.MouseMotionListener
     * @see      #removeMouseMotionListener(MouseMotionListener)
     * @see      #getMouseMotionListeners
     */
    public synchronized void addMouseMotionListener(MouseMotionListener listener) {
        if (listener == null) {
            return;
        }
        mouseMotionListener = AWTEventMulticaster.add(mouseMotionListener, listener);
    }

    /**
     * Removes the specified mouse-motion listener.  Calling this method with
     * <code>null</code> or an invalid value has no effect.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param    listener   the mouse listener
     * @see      java.awt.event.MouseEvent
     * @see      java.awt.event.MouseMotionListener
     * @see      #addMouseMotionListener(MouseMotionListener)
     * @see      #getMouseMotionListeners
     */
    public synchronized void removeMouseMotionListener(MouseMotionListener listener) {
        if (listener == null) {
            return;
        }
        mouseMotionListener = AWTEventMulticaster.remove(mouseMotionListener, listener);
    }

    /**
     * Returns an array of all the mouse-motion listeners
     * registered on this <code>TrayIcon</code>.
     *
     * @return all of the <code>MouseInputListeners</code> registered on
     * this <code>TrayIcon</code> or an empty array if no mouse
     * listeners are currently registered
     *
     * @see      #addMouseMotionListener(MouseMotionListener)
     * @see      #removeMouseMotionListener(MouseMotionListener)
     * @see      java.awt.event.MouseMotionListener
     */
    public synchronized MouseMotionListener[] getMouseMotionListeners() {
        return (MouseMotionListener[]) (getListeners(MouseMotionListener.class));
    }

    /**
     * Returns the command name of the action event fired by this tray icon.
     *
     * @return the action command name, or <code>null</code> if none exists
     * @see #addActionListener(ActionListener)
     * @see #setActionCommand(String)
     */
    public String getActionCommand() {
        return actionCommand;
    }

    /**
     * Sets the command name for the action event fired by this tray
     * icon.  By default, this action command is set to
     * <code>null</code>.
     *
     * @param command  a string used to set the tray icon's
     *                 action command.
     * @see java.awt.event.ActionEvent
     * @see #addActionListener(ActionListener)
     * @see #getActionCommand
     */
    public void setActionCommand(String command) {
        actionCommand = command;
    }

    /**
     * Adds the specified action listener to receive
     * <code>ActionEvent</code>s from this <code>TrayIcon</code>.
     * Action events usually occur when a user selects the tray icon,
     * using either the mouse or keyboard.  The conditions in which
     * action events are generated are platform-dependent.
     *
     * <p>Calling this method with a <code>null</code> value has no
     * effect.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param         listener the action listener
     * @see           #removeActionListener
     * @see           #getActionListeners
     * @see           java.awt.event.ActionListener
     * @see #setActionCommand(String)
     */
    public synchronized void addActionListener(ActionListener listener) {
        if (listener == null) {
            return;
        }
        actionListener = AWTEventMulticaster.add(actionListener, listener);
    }

    /**
     * Removes the specified action listener.  Calling this method with
     * <code>null</code> or an invalid value has no effect.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param    listener   the action listener
     * @see      java.awt.event.ActionEvent
     * @see      java.awt.event.ActionListener
     * @see      #addActionListener(ActionListener)
     * @see      #getActionListeners
     * @see #setActionCommand(String)
     */
    public synchronized void removeActionListener(ActionListener listener) {
        if (listener == null) {
            return;
        }
        actionListener = AWTEventMulticaster.remove(actionListener, listener);
    }

    /**
     * Returns an array of all the action listeners
     * registered on this <code>TrayIcon</code>.
     *
     * @return all of the <code>ActionListeners</code> registered on
     * this <code>TrayIcon</code> or an empty array if no action
     * listeners are currently registered
     *
     * @see      #addActionListener(ActionListener)
     * @see      #removeActionListener(ActionListener)
     * @see      java.awt.event.ActionListener
     */
    public synchronized ActionListener[] getActionListeners() {
        return (ActionListener[])(getListeners(ActionListener.class));
    }

    /**
     * The message type determines which icon will be displayed in the
     * caption of the message, and a possible system sound a message
     * may generate upon showing.
     *
     * @see TrayIcon
     * @see TrayIcon#displayMessage(String, String, MessageType)
     * @since 1.6
     */
    public enum MessageType {
        /** An error message */
        ERROR,
        /** A warning message */
        WARNING,
        /** An information message */
        INFO,
        /** Simple message */
        NONE
    };

    /**
     * Displays a popup message near the tray icon.  The message will
     * disappear after a time or if the user clicks on it.  Clicking
     * on the message may trigger an {@code ActionEvent}.
     *
     * <p>Either the caption or the text may be <code>null</code>, but an
     * <code>NullPointerException</code> is thrown if both are
     * <code>null</code>.
     *
     * When displayed, the caption or text strings may be truncated on
     * some platforms; the number of characters that may be displayed is
     * platform-dependent.
     *
     * <p><strong>Note:</strong> Some platforms may not support
     * showing a message.
     *
     * @param caption the caption displayed above the text, usually in
     * bold; may be <code>null</code>
     * @param text the text displayed for the particular message; may be
     * <code>null</code>
     * @param messageType an enum indicating the message type
     * @throws NullPointerException if both <code>caption</code>
     * and <code>text</code> are <code>null</code>
     */
    public void displayMessage(String caption, String text, MessageType messageType) {
        if (caption == null && text == null) {
            throw new NullPointerException("displaying the message with both caption and text being null");
        }

        TrayIconPeer peer = this.peer;
        if (peer != null) {
            peer.displayMessage(caption, text, messageType.toString());
        }
    }

    /**
     * Returns the size, in pixels, of the space that the tray icon
     * occupies in the system tray.  For the tray icon that is not yet
     * added to the system tray, the returned size is equal to the
     * result of the {@link SystemTray#getTrayIconSize}.
     *
     * @return the size of the tray icon, in pixels
     * @see TrayIcon#setImageAutoSize(boolean)
     * @see java.awt.Image
     * @see TrayIcon#getSize()
     */
    public Dimension getSize() {
        return SystemTray.getSystemTray().getTrayIconSize();
    }

    // ****************************************************************
    // ****************************************************************

    <T extends EventListener> T[] getListeners(Class<T> listenerType) {
        EventListener l = null;
        if (listenerType == MouseListener.class) {
            l = mouseListener;
        } else if (listenerType == MouseMotionListener.class) {
            l = mouseMotionListener;
        } else if (listenerType == ActionListener.class) {
            l = actionListener;
        }
        return AWTEventMulticaster.getListeners(l, listenerType);
    }

    void addNotify()
      throws AWTException
    {
        synchronized (this) {
            if (peer == null) {
                peer = ((SunToolkit)Toolkit.getDefaultToolkit()).createTrayIcon(this);
            }
        }
        peer.setToolTip(tooltip);
    }

    void removeNotify() {
        TrayIconPeer p = null;
        synchronized (this) {
            p = peer;
            peer = null;
        }
        if (p != null) {
            p.dispose();
        }
    }

    void setID(int id) {
        this.id = id;
    }

    int getID(){
        return id;
    }

    void dispatchEvent(AWTEvent e) {
        EventQueue.setCurrentEventAndMostRecentTime(e);
        Toolkit.getDefaultToolkit().notifyAWTEventListeners(e);
        processEvent(e);
    }

    void processEvent(AWTEvent e) {
        if (e instanceof MouseEvent) {
            switch(e.getID()) {
            case MouseEvent.MOUSE_PRESSED:
            case MouseEvent.MOUSE_RELEASED:
            case MouseEvent.MOUSE_CLICKED:
                processMouseEvent((MouseEvent)e);
                break;
            case MouseEvent.MOUSE_MOVED:
                processMouseMotionEvent((MouseEvent)e);
                break;
            default:
                return;
            }
        } else if (e instanceof ActionEvent) {
            processActionEvent((ActionEvent)e);
        }
    }

    void processMouseEvent(MouseEvent e) {
        MouseListener listener = mouseListener;

        if (listener != null) {
            int id = e.getID();
            switch(id) {
            case MouseEvent.MOUSE_PRESSED:
                listener.mousePressed(e);
                break;
            case MouseEvent.MOUSE_RELEASED:
                listener.mouseReleased(e);
                break;
            case MouseEvent.MOUSE_CLICKED:
                listener.mouseClicked(e);
                break;
            default:
                return;
            }
        }
    }

    void processMouseMotionEvent(MouseEvent e) {
        MouseMotionListener listener = mouseMotionListener;
        if (listener != null &&
            e.getID() == MouseEvent.MOUSE_MOVED)
        {
            listener.mouseMoved(e);
        }
    }

    void processActionEvent(ActionEvent e) {
        ActionListener listener = actionListener;
        if (listener != null) {
            listener.actionPerformed(e);
        }
    }

    private static native void initIDs();
}
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