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The Java Developers Almanac 1.4Order this book from Amazon. |
e899. Setting an Accessory Component in a JFileChooser DialogThe accessory is an optional component that can be added to a file chooser dialog to show a preview image of the selected file. By default, a file chooser dialog does not have an accessory installed. This example demonstrates how to install an accessory component.JFileChooser chooser = new JFileChooser(); // Create and set the accessory chooser.setAccessory(new MyAccessory(chooser)); // Show the dialog; wait until dialog is closed chooser.showOpenDialog(frame); public class MyAccessory extends JComponent implements PropertyChangeListener { public MyAccessory(JFileChooser chooser) { // Listen for changes to the selected file chooser.addPropertyChangeListener(this); // Set a preferred size setPreferredSize(new Dimension(50, 50)); } // This listener listens for changes to the selected file public void propertyChange(PropertyChangeEvent evt) { if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals( evt.getPropertyName())) { JFileChooser chooser = (JFileChooser)evt.getSource(); // Get the new selected file File newFile = (File)evt.getNewValue(); // Prepare the preview data based on the new selected file // Repaint this component repaint(); } } public void paint(Graphics g) { // Paint a preview of the selected file } }
e900. Displaying the Current Directory in the Title of a JFileChooser Dialog
© 2002 Addison-Wesley. |