0

参考这个错误：

4848910：UIManager 只更新一次颜色

我在 JFrame 上有两个按钮。从第一个按钮开始，我将 LAF 颜色更改为

UIManager.put( "Button.background", new ColorUIResource(Color.red) );
SwingUtilities.updateComponentTreeUI( this.getContentPane() );

在第二个按钮上，我正在更改 LAF 颜色

UIManager.put( "Button.background", new ColorUIResource(Color.green) );
SwingUtilities.updateComponentTreeUI( this.getContentPane() );

在这里，我使用的是 ColorUIResource （如错误的解决方案所述），但我的问题与引用的错误中描述的相同。即 UIManager 会在第一次单击任何按钮时更改颜色，但不会在后续单击时更改颜色。

我错过了什么吗？任何帮助，将不胜感激。

4

1 回答 1

2

代码

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.LookAndFeel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.UnsupportedLookAndFeelException;

public class NimbusTestButtonsBackground extends JFrame {

    private static final long serialVersionUID = 1L;
    private javax.swing.JButton button;

    public NimbusTestButtonsBackground() {
        button = new javax.swing.JButton();
        button.setText("Text");
        add(button);
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        this.pack();
        Timer t = new Timer(1000, new ActionListener() {

            private Random r = new Random();

            @Override
            public void actionPerformed(ActionEvent e) {
                Color c = new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));
                try {
                    LookAndFeel lnf = UIManager.getLookAndFeel().getClass().newInstance();
                    UIDefaults uiDefaults = lnf.getDefaults();
                    uiDefaults.put("nimbusBase", c);
                    UIManager.getLookAndFeel().uninitialize();
                    UIManager.setLookAndFeel(lnf);
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }
                UIDefaults defaults = UIManager.getDefaults();
                defaults.put("Button.background", c);
                SwingUtilities.updateComponentTreeUI(button);
            }
        });
        t.start();
    }

    public static void main(String args[]) {
        try {
            for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (Exception e) {
            return;
        }

        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new NimbusTestButtonsBackground().setVisible(true);
            }
        });
    }
}
于 2013-01-04T10:57:09.760 回答