java - 使用 Nimbus 更改 JProgressBar 的颜色？

Question

当您使用 Nimbus LookAndFeel 时，有谁知道如何更改 JProgressBar 的颜色？

Answer 1

我已经覆盖了整个nimbusOrange-Default 值，它改变了所有 ProgressBar-Colors 和任何其他nimbusOrange. （InternalFrame - 最小化按钮）
这里有nimbusBase（蓝色）

UIDefaults defaults = UIManager.getLookAndFeelDefaults();
defaults.put("nimbusOrange",defaults.get("nimbusBase"));

更好的是编写一个自己的 Painter 并将其设置为UIManagervia

UIManager.put("ProgressBar[Enabled].backgroundPainter", myPainter);

如果您只想更改单个 ProgressBar 实例的颜色，您可以使用每组件自定义

progress = new JProgressBar();
UIDefaults defaults = new UIDefaults();
defaults.put("ProgressBar[Enabled].backgroundPainter", new MyPainter());
progress.putClientProperty("Nimbus.Overrides.InheritDefaults", Boolean.TRUE);
progress.putClientProperty("Nimbus.Overrides", defaults);

Answer 2

MyPainter 的示例如下：

class MyPainter implements Painter<JProgressBar> {

    private final Color color;

    public MyPainter(Color c1) {
        this.color = c1;
    }
    @Override
    public void paint(Graphics2D gd, JProgressBar t, int width, int height) {
        gd.setColor(color);
        gd.fillRect(0, 0, width, height);
    }
}

但我的编译器或 IDE (eclipse) 说它不知道 Painter。有没有人可以帮助我！

Answer 3

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class JProgressBarDemo extends JFrame {
    protected int minValue = 0;
    protected int maxValue = 100;
    protected int counter = 0;
    protected JProgressBar progressBar;

    public JProgressBarDemo() {
        super("JProgressBar Demo");
        setSize(300, 100);

        UIManager.put("ProgressBar.background", Color.BLACK); //colour of the background
        UIManager.put("ProgressBar.foreground", Color.RED); //colour of progress bar
        UIManager.put("ProgressBar.selectionBackground",Color.YELLOW); //colour of percentage counter on black background
        UIManager.put("ProgressBar.selectionForeground",Color.BLUE); //colour of precentage counter on red background

        progressBar = new JProgressBar();
        progressBar.setMinimum(minValue);
        progressBar.setMaximum(maxValue);
        progressBar.setStringPainted(true);
        JButton start = new JButton("Start");

        start.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Thread runner = new Thread() {
                    public void run() {
                        counter = minValue;
                        while (counter <= maxValue) {
                            Runnable runme = new Runnable() {
                                public void run() {
                                    progressBar.setValue(counter);
                                }
                            };

                            SwingUtilities.invokeLater(runme);
                            counter++;
                            try {
                                Thread.sleep(100);
                            } catch (Exception ex) {
                            }
                        }
                    }
                };
                runner.start();
            }
        });

        getContentPane().add(progressBar, BorderLayout.CENTER);
        getContentPane().add(start, BorderLayout.WEST);
        WindowListener wndCloser = new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        };

        addWindowListener(wndCloser);
        setVisible(true);
    }
    public static void main(String[] args) {
        new JProgressBarDemo();
    }
}