By John Zukowski
Totally up to date for the 1.5 variation of the Java 2 Platform, the 3rd version of this praised booklet is a one-stop source for severe Java builders. This publication indicates you the components of Java Swing API that you're going to use day-by-day to create graphical person interfaces (GUI). additionally, you will know about the Model-View-Controller structure that lies at the back of all Swing elements, and approximately customizing parts for particular environments. Zukowski additionally presents customized editors and renderers to be used with tables, timber, and checklist parts. you are going to stumble upon an summary of Swing structure, and know about middle Swing elements, toggelable elements, occasion dealing with with the Swing part Set, Swing menus and toolbars, borders, pop-ups, choosers, and extra.
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Additional resources for The Definitive Guide to Java Swing, 3rd Edition
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Any observer class interested in such an event needs to register with the component an implementer of the appropriate interface. Then each implementation is notified when the event happens. Figure 2-2 illustrates this sequence. ■Note Some users like to call the event delegation model a publish-subscribe model, in which components publish a set of available listeners for subscription, and others can subscribe to them. CHAPTER 2 ■ EVENT HANDLING WITH THE SWING COMPONENT SET Figure 2-2. Event delegation sequence diagram Event Listeners As Observers Using event listeners to handle an event is a three-step process: 1.
Getting the current keys property setting allows you to find out which ones can be set en masse, instead of asking for each one individually. Table 2-3 describes the predefined set of Action constants that can be used as the key. You can also add your own constants, to look up later when the action happens. Table 2-3. AbstractAction Lookup Property Keys Constant Description NAME Action name, used as button label SMALL_ICON Icon for the Action, used as button label SHORT_DESCRIPTION Short description of the Action; could be used as tooltip text, but not by default LONG_DESCRIPTION Long description of the Action; could be used for accessibility (see Chapter 22) ACCELERATOR KeyStroke string; can be used as the accelerator for the Action ACTION_COMMAND_KEY InputMap key; maps to the Action in the ActionMap of the associated JComponent MNEMONIC_KEY Key code; can be used as mnemonic for action DEFAULT Unused constant that could be used for your own property Once a property has been placed in the lookup table, you can get it with public Object getValue(String key).
Using SwingUtilities for Mouse Button Identification The Swing component set includes a utility class called SwingUtilities that provides a collection of generic helper methods. You will look at this class periodically throughout this book when a particular set of methods for this class seems useful. For the button example in Listing 2-1, the methods of interest are related to determining which mouse button has been selected. The MouseInputListener interface consists of seven methods: mouseClicked(MouseEvent), mouseEntered(MouseEvent), mouseExited(MouseEvent), mousePressed(MouseEvent), and mouseReleased(MouseEvent) from MouseListener; and mouseDragged(MouseEvent) and mouseMoved(MouseEvent) from MouseMotionListener.