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CHAPTER 4 AWT AND SWING UPDATES
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Microsoft Windows.) Now, your Java programs can fight for their rights, too. As the system tray is shared by all applications running on a system, you shouldn t place every icon there; however, for those applications that require quick, immediate notifications and/or startup, this is a good place to put them, as you can have the icon flash or jump up and down to grab the user s attention. Your application can even offer the user the option of whether to add the icon to the tray.
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Figure 4-4. The Windows system tray area The SystemTray class uses the Singleton pattern to offer access to the single instance of the tray.
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SystemTray tray = SystemTray.getSystemTray();
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Of course, before you even get the tray, you must see if it is supported on the user s platform.
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if (SystemTray.isSupported()) { SystemTray tray = SystemTray.getSystemTray(); } else { System.err.println("No system tray. Go home."); }
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While the tray is supported on Sun s runtimes for Microsoft Windows, Linux, and Solaris, it is possible that another platform might not support the tray immediately after the Java 6 release, but add support for such a feature later. What can you do with SystemTray once you get its instance Why, add TrayIcon objects to it, of course. A tray icon is an image with an associated tool tip and pop-up menu. Rest your mouse over the image and you ll see the tool tip. Click on the image with the appropriate mouse action and you ll see the pop-up menu. Of course, if you want to do much of anything, you have to add menu items and listeners, too. Listing 4-4 shows a simple example of using a system tray and tray icon. The jpgIcon.jpg image comes from the demo area of the JDK. Feel free to use your own icon as the image. Any image format supported by the Java platform can be used, including user-created ones. It just has to be an Image object, with a capital I.
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CHAPTER 4 AWT AND SWING UPDATES
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Listing 4-4. Demonstrating a Simple System Tray
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import javax.swing.*; import java.awt.*; public class SimpleTray { public static void main(String args[]) { Runnable runner = new Runnable() { public void run() { if (SystemTray.isSupported()) { SystemTray tray = SystemTray.getSystemTray(); Image image = Toolkit.getDefaultToolkit().getImage("jpgIcon.jpg"); PopupMenu popup = new PopupMenu(); MenuItem item = new MenuItem("Hello, World"); popup.add(item); TrayIcon trayIcon = new TrayIcon(image, "Tip Text", popup); try { tray.add(trayIcon); } catch (AWTException e) { System.err.println("Unable to add to system tray: " + e); } } else { System.err.println("No system tray available"); } } }; EventQueue.invokeLater(runner); } }
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Compiling and running the program will add another icon to the system tray. Rest your mouse over it to see the tool tip text, as shown in Figure 4-5. Right-click the tray icon to see the pop-up menu, as shown in Figure 4-6.
Figure 4-5. Showing the icon and tool tip for a new system tray application
CHAPTER 4 AWT AND SWING UPDATES
Figure 4-6. Showing the menu for a new system tray application
It s simple so far, but there s much more you can do with the system tray and its icons. Yes, each of your applications can add multiple icons to the system tray. To make the SimpleTray application interesting, you should first have your application detect when the tray icon is added or removed from the system tray. The SystemTray class allows you to add a PropertyChangeListener to detect these operations. Its addPropertyChangeListener() method requires you to pass in the property name to watch for changes. In the case of SystemTray, that name is trayIcons.
tray.addPropertyChangeListener("trayIcons", propListener);
With the PropertyChangeListener, the old and new values you are told about make up the array of tray icons associated with the SystemTray. By checking the difference between the old and new values, you can see which specific TrayIcon was added, or just calculate the delta between the counts of the two if you only need to know whether the operation was an add() or a remove().
PropertyChangeListener propListener = new PropertyChangeListener() { public void propertyChange(PropertyChangeEvent evt) { TrayIcon oldTray[] = (TrayIcon[])evt.getOldValue(); TrayIcon newTray[] = (TrayIcon[])evt.getNewValue(); System.out.println(oldTray.length + " / " + newTray.length); } };
Next, you need to detect when the user selects an item in the pop-up menu. Associate an ActionListener with the MenuItem operation for selection detection. This is no different than pre-JDK 6 code for pop-up menus. What is different is the action that you can perform. One operation specific to the TrayIcon is the displaying of specially formatted messages via calling the following displayMessage() method: public void displayMessage (String caption, String text, TrayIcon.MessageType messageType). Here, selecting the Hello, World menu item shows a caption of Good-bye and text message of Cruel World.
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