SwingアプリケーションのLookAndFeelを外部から切り替える
Total: 4448, Today: 1, Yesterday: 0
Posted by aterai at
Last-modified:
概要
SwingアプリケーションのLookAndFeelをagentを使って外部から切り替えてデバッグします。
ソースコード
package swinghelper;
import java.awt.*;
import java.awt.event.*;
import java.lang.instrument.*;
import javax.swing.*;
public class LookAndFeelDebugAgent {
public static void premain(String args) throws Exception {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
ButtonGroup group = new ButtonGroup();
Box box = Box.createVerticalBox();
for (LookAndFeelEnum lnf: LookAndFeelEnum.values()) {
JRadioButton rb = new JRadioButton(new ChangeLookAndFeelAction(lnf));
group.add(rb); box.add(rb);
}
box.add(Box.createVerticalGlue());
box.setBorder(BorderFactory.createEmptyBorder(5, 25, 5, 25));
JFrame frame = new JFrame("LnF");
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.getContentPane().add(box);
frame.pack();
frame.setVisible(true);
}
private static enum LookAndFeelEnum {
Metal ("javax.swing.plaf.metal.MetalLookAndFeel"),
Mac ("com.sun.java.swing.plaf.mac.MacLookAndFeel"),
Motif ("com.sun.java.swing.plaf.motif.MotifLookAndFeel"),
Windows("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"),
GTK ("com.sun.java.swing.plaf.gtk.GTKLookAndFeel"),
Nimbus ("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
private final String clazz;
private LookAndFeelEnum(String clazz) {
this.clazz = clazz;
}
public String getClassName() {
return clazz;
}
}
private static class ChangeLookAndFeelAction extends AbstractAction {
private final String lnf;
protected ChangeLookAndFeelAction(LookAndFeelEnum lnfe) {
super(lnfe.toString());
this.lnf = lnfe.getClassName();
this.setEnabled(isAvailableLookAndFeel(lnf));
}
private static boolean isAvailableLookAndFeel(String lnf) {
try {
Class lnfClass = Class.forName(lnf);
LookAndFeel newLnF = (LookAndFeel) lnfClass.newInstance();
return newLnF.isSupportedLookAndFeel();
} catch (Exception e) {
return false;
}
}
@Override public void actionPerformed(ActionEvent e) {
try {
UIManager.setLookAndFeel(lnf);
} catch (Exception ex) {
ex.printStackTrace();
System.out.println("Failed loading L&F: " + lnf);
}
for (Frame f: Frame.getFrames()) {
if (f instanceof JFrame) {
SwingUtilities.updateComponentTreeUI(f);
f.pack();
}
}
}
}
}
解説
アプリケーションと同時にLook And Feelを切り替えるための別パネルを起動して、対象アプリケーションのソースコードを変更することなくLookAndFeelの変更がテスト可能です。
javaagentを使用するため、JDK 1.6以上で以下のように起動するjava -javaagent:lnfagent.jar -jar example.jar