Mega Code Archive
Get the desired look and feel from a per-user preference
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/*
* Copyright (c) 2004 David Flanagan. All rights reserved.
* This code is from the book Java Examples in a Nutshell, 3nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose,
* including teaching and use in open-source projects.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book,
* please visit http://www.davidflanagan.com/javaexamples3.
*/
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.prefs.Preferences;
import javax.swing.ButtonGroup;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class LookAndFeelPrefs {
public static final String PREF_NAME = "preferredLookAndFeelClassName";
/**
* Get the desired look and feel from a per-user preference. If the
* preferences doesn't exist or is unavailable, use the default look and feel.
* The preference is shared by all classes in the same package as prefsClass.
*/
public static void setPreferredLookAndFeel(Class prefsClass) {
Preferences prefs = Preferences.userNodeForPackage(prefsClass);
String defaultLAF = UIManager.getSystemLookAndFeelClassName();
String laf = prefs.get(PREF_NAME, defaultLAF);
try {
UIManager.setLookAndFeel(laf);
} catch (Exception e) { // ClassNotFound or InstantiationException
// An exception here is probably caused by a bogus preference.
// Ignore it silently; the user will make do with the default LAF.
}
}
/**
* Create a menu of radio buttons listing the available Look and Feels. When
* the user selects one, change the component hierarchy under frame to the new
* LAF, and store the new selection as the current preference for the package
* containing class c.
*/
public static JMenu createLookAndFeelMenu(final Class prefsClass, final ActionListener listener) {
// Create the menu
final JMenu plafmenu = new JMenu("Look and Feel");
// Create an object used for radio button mutual exclusion
ButtonGroup radiogroup = new ButtonGroup();
// Look up the available look and feels
UIManager.LookAndFeelInfo[] plafs = UIManager.getInstalledLookAndFeels();
// Find out which one is currently used
String currentLAFName = UIManager.getLookAndFeel().getClass().getName();
// Loop through the plafs, and add a menu item for each one
for (int i = 0; i < plafs.length; i++) {
String plafName = plafs[i].getName();
final String plafClassName = plafs[i].getClassName();
// Create the menu item
final JMenuItem item = plafmenu.add(new JRadioButtonMenuItem(plafName));
item.setSelected(plafClassName.equals(currentLAFName));
// Tell the menu item what to do when it is selected
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
// Set the new look and feel
try {
UIManager.setLookAndFeel(plafClassName);
} catch (UnsupportedLookAndFeelException e) {
// Sometimes a Look-and-Feel is installed but not
// supported, as in the Windows LaF on Linux platforms.
JOptionPane.showMessageDialog(plafmenu, "The selected Look-and-Feel is "
+ "not supported on this platform.", "Unsupported Look And Feel",
JOptionPane.ERROR_MESSAGE);
item.setEnabled(false);
} catch (Exception e) { // ClassNotFound or Instantiation
item.setEnabled(false); // shouldn't happen
}
// Make the selection persistent by storing it in prefs.
Preferences p = Preferences.userNodeForPackage(prefsClass);
p.put(PREF_NAME, plafClassName);
// Invoke the supplied action listener so the calling
// application can update its components to the new LAF
// Reuse the event that was passed here.
listener.actionPerformed(event);
}
});
// Only allow one menu item to be selected at once
radiogroup.add(item);
}
return plafmenu;
}
}
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