---
title: SwingアプリケーションのLookAndFeelを外部から切り替える
author: aterai
pubdate: 2008-11-28
description: 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。
---
#contents
* Summary [#summary]
`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。
- [https://ateraimemo.com/data/swing/lnfagent-1.0.1.jar lnfagent-1.0.1.jar]
- [https://ateraimemo.com/data/swing/LookAndFeelDebugAgent-1.0.1.zip LookAndFeelDebugAgent-1.0.1.zip]
#ref(https://lh5.googleusercontent.com/_9Z4BYR88imo/TT_f_Hrp06I/AAAAAAAAAzQ/zeH8FoIfM4A/s800/LookAndFeelDebugAgent.png)
// #ref(https://lh5.googleusercontent.com/_9Z4BYR88imo/TT_f_Hrp06I/AAAAAAAAAzQ/zeH8FoIfM4A/s800/LookAndFeelDebugAgent.png)
#ref(https://ateraimemo.com/data/swing/LookAndFeelDebugAgent.png)
* ソースコード [#sourcecode]
#code{{
package swinghelper;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.Optional;
import java.util.logging.Logger;
import javax.swing.*;
import com.formdev.flatlaf.*;
public class LookAndFeelDebugAgent {
public static Component makeUI() {
Box box = LookAndFeelUtils.createLookAndFeelBox();
box.add(Box.createVerticalGlue());
box.setBorder(BorderFactory.createEmptyBorder(5, 25, 5, 25));
return box;
}
public static void premain(String args) {
EventQueue.invokeLater(() -> {
JFrame frame = new JFrame("LookAndFeelDebugAgent");
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.getContentPane().add(makeUI());
frame.pack();
frame.setVisible(true);
});
}
}
final class LookAndFeelUtils {
private static String lookAndFeel = UIManager.getLookAndFeel().getClass().getName();
private LookAndFeelUtils() {
/* Singleton */
}
public static Box createLookAndFeelBox() {
Box box = Box.createVerticalBox();
ButtonGroup buttonGroup = new ButtonGroup();
for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
AbstractButton b = makeButton(info);
initLookAndFeelAction(info, b);
box.add(b);
buttonGroup.add(b);
}
for (Class<?> clz : Arrays.asList(FlatLightLaf.class, FlatDarkLaf.class)) {
String full = clz.getName();
String name = full.substring(full.lastIndexOf('.') + 1);
UIManager.LookAndFeelInfo info = new UIManager.LookAndFeelInfo(name, full);
AbstractButton b = makeButton(info);
initLookAndFeelAction(info, b);
box.add(b);
buttonGroup.add(b);
}
return box;
}
private static AbstractButton makeButton(UIManager.LookAndFeelInfo info) {
boolean selected = info.getClassName().equals(lookAndFeel);
return new JRadioButton(info.getName(), selected);
}
public static void initLookAndFeelAction(UIManager.LookAndFeelInfo info, AbstractButton b) {
String cmd = info.getClassName();
b.setText(info.getName());
b.setActionCommand(cmd);
b.setHideActionText(true);
b.addActionListener(e -> setLookAndFeel(cmd));
}
private static void setLookAndFeel(String newLookAndFeel) {
String oldLookAndFeel = lookAndFeel;
if (!oldLookAndFeel.equals(newLookAndFeel)) {
try {
UIManager.setLookAndFeel(newLookAndFeel);
lookAndFeel = newLookAndFeel;
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
Logger.getGlobal().severe(ex::getMessage);
return;
}
updateLookAndFeel();
}
}
private static void updateLookAndFeel() {
for (Window window : Window.getWindows()) {
SwingUtilities.updateComponentTreeUI(window);
}
}
}
}}
* Explanation [#explanation]
- 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
- このサンプルではデフォルト以外の`Look And Feel`として`FlatLightLaf`と`FlatDarkLaf`を追加して以下のように`Boot-Class-Path`を指定してコンパイルしている
#code{{
<target name="package" depends="compile">
<jar jarfile="${build.dir}/${name}-${version}.jar" basedir="${build.dest}">
<manifest>
<!--attribute name="Main-Class" value="${main.class}" /-->
<!--attribute name="Agent-Class" value="${main.class}" /-->
<attribute name="Premain-Class" value="${main.class}" />
<attribute name="Class-Path" value="${runtime.classpath}" />
<attribute name="Can-Retransform-Classes" value="true"/>
<attribute name="Boot-Class-Path" value="flatlaf-3.5.jar" />
</manifest>
</jar>
</target>
}}
- `javaagent`を使用するため、`JDK 1.6`以上で以下のように起動する
#code{{
java -javaagent:lnfagent1.0.1.jar -jar example.jar
}}
* Reference [#reference]
- [https://docs.oracle.com/javase/jp/8/docs/api/java/lang/instrument/package-summary.html java.lang.instrument (Java Platform SE 8)]
* Comment [#comment]
#comment
#comment