James Elliott's Java Swing PDF

By James Elliott

ISBN-10: 0596004087

ISBN-13: 9780596004088

Meant for programmers accustomed to Java and the older AWT parts, this advisor introduces the whole Swing part set and is going into element in regards to the model-delegate structure at the back of the elements. the second one version displays alterations within the Java 2 ordinary variation SDK 1.4 and provides chapters at the Jformatted textfield classification and drag and drop.

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Our handler uses the buttons' text labels to decide which button was pressed. That's not a problem since our buttons still display some text. What happens if we throw that text out? How can we tell which button was pressed? add(copyButton); If we do this for every button, the application looks like Figure 2-5. Figure 2-5. getActionCommand( )); } This doesn't do much. Normally, you would need to distinguish between the various buttons or other components that report to this handler. Since we implement the ActionListener interface directly in the application class, we can use the simple route of checking the source of the event against the buttons we know we have.

If you press the Mac, Metal, Motif, or Windows button in this application, it switches from the current L&F to the appropriate version (if it's available on your system). Figure 2-3 shows the effect. Figure 2-3. JButtons using the Mac (left), Motif (right), and Windows (bottom) L&Fs Now we've got a bunch of JButtons. We're still using the old AWT Panel and Frame objects as containers for our applications. You can change them easily, too. Changing Panel to JPanel is as simple as updating the buttons: just do a global replace, and you're done.

Here, we simply print the action command sent with the ActionEvent. You can add more features based on the contents of the ActionEvent. 1 Properties The AbstractAction class stores its keyed properties in a Hashtable object. Beyond that, the AbstractAction object contains a few properties, as shown in Table 3-3. The enabled property defines whether the application can invoke the action. When this property changes, AbstractAction fires a PropertyChangeEvent. The mutator for this property, setEnabled( ), is synchronized.

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Java Swing by James Elliott


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