java - JTabbedPane 更改选定选项卡背景颜色

Question

我正在尝试根据所选选项卡更改 JTabbedPane 边框的颜色。使用答案 here和 on the web ，我已经做到了:

import java.awt.*;

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.basic.BasicTabbedPaneUI;

public class TabbedPaneTest implements Runnable {
    JTabbedPane pane = new JTabbedPane();;

    public void run() {
        // magenta border first so any changes will be obvious
        setTabbedPaneBorderColor(new Color(255, 0, 255));

        JPanel container = new JPanel();
        container.setSize(new Dimension(500, 200));
        pane.setPreferredSize(new Dimension(400, 200));
        pane.addTab("A", createTab(Color.RED));
        pane.addTab("B", createTab(Color.YELLOW));
        pane.addTab("C", createTab(Color.BLUE));
        pane.addChangeListener(new TabSelected());
        container.add(pane);

        final JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(container);
        frame.setSize(500, 300);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private JPanel createTab(Color color) {
        JPanel p = new JPanel();
        p.setBorder(BorderFactory.createLineBorder(color, 2));
        return p;
    }

    private class TabSelected implements ChangeListener {

        @Override
        public void stateChanged(ChangeEvent e) {
            int index = pane.getSelectedIndex();

            switch (index) {
            case 0:
                setTabbedPaneBorderColor(Color.RED);
                break;
            case 1:
                setTabbedPaneBorderColor(Color.YELLOW);
                break;
            case 2:
                setTabbedPaneBorderColor(Color.BLUE);
                break;
            }

        }

    }

    public void setTabbedPaneBorderColor(Color tabBorderColor) {

        UIManager.put("TabbedPane.borderHightlightColor", tabBorderColor);
        UIManager.put("TabbedPane.darkShadow", tabBorderColor);
        UIManager.put("TabbedPane.shadow", tabBorderColor);
        UIManager.put("TabbedPane.light", tabBorderColor);
        UIManager.put("TabbedPane.highlight", tabBorderColor);
        UIManager.put("TabbedPane.focus", tabBorderColor);
        UIManager.put("TabbedPane.selectHighlight", tabBorderColor);


        pane.setUI(new BasicTabbedPaneUI() {
               @Override
               protected void installDefaults() {
                   super.installDefaults();
                   highlight = UIManager.getColor("TabbedPane.light");
                   lightHighlight = UIManager.getColor("TabbedPane.highlight");
                   shadow = UIManager.getColor("TabbedPane.shadow");
                   darkShadow =UIManager.getColor("TabbedPane.darkShadow");
                   focus = UIManager.getColor("TabbedPane.focus");
               }
            });
    }

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeLater(new TabbedPaneTest());
    }
}

特别是，setTabbedPaneBorderColor() 方法完全符合我的要求(也就是说，它修改选项卡周围的精美边框，而不是其中包含的面板上的边框或 JTabbedPane 整个空间周围的普通矩形边框占据)。由于某种原因，这个示例引发了一个错误，该错误没有出现在我的实际程序中(我认为它与 SwingWorker 和 EDT 有关)。现在我正在尝试弄清楚如何更改所选选项卡的背景。

相关属性是

UIManager.put("TabbedPane.selected",Color.MAGENTA);

但是，我似乎没有办法在 tabUI 中使用它(这令人困惑，但 BasicTabbedPaneUI 中没有背景 Color 变量)。

编辑:希望更有知识的人会给出一个好的答案，但是如果您用谷歌搜索这个，我当前的解决方案是对所选选项卡的背景颜色使用中性颜色，因为似乎没有简单的方法来更新它。我还切换到中性选项卡边框(即使您可以更新它，如示例所示)并在包含的 JPanel 内创建彩色边框。这并不理想，但看起来相当不错，而且我目前没有时间继续寻找更清洁的解决方案。

Answer 1

这对我有用

            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[Enabled].backgroundPainter", new BackgroundPainter(Color.white));
            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[Enabled+MouseOver].backgroundPainter", new BackgroundPainter(Color.white));
            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[Enabled+Pressed].backgroundPainter", new BackgroundPainter(Color.white));
            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[Focused+MouseOver+Selected].backgroundPainter", new BackgroundPainter(Color.white));
            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[Focused+Pressed+Selected].backgroundPainter", new BackgroundPainter(Color.white));
            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[Focused+Selected].backgroundPainter", new BackgroundPainter(Color.GRAY));
            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[MouseOver+Selected].backgroundPainter", new BackgroundPainter(Color.white));
            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[Pressed+Selected].backgroundPainter", new BackgroundPainter(Color.white));
            UIManager.getLookAndFeelDefaults().put("TabbedPane:TabbedPaneTab[Selected].backgroundPainter", new BackgroundPainter(Color.white));

BackgroundPainter类

public class BackgroundPainter implements Painter<JComponent> {

  private Color color = null;

  BackgroundPainter(Color c) {
    color = c;
  }

  @Override
  public void paint(Graphics2D g, JComponent object, int width, int height) {
    if (color != null) {
        g.setColor(color);
        g.fillRect(0, 0, width - 1, height - 1);
    }
  }
}