在 Swing 中新增分頁後如何動態更新 JTabbedPane 的外觀？-java教程-PHP中文網

在 Swing 中新增分頁後如何動態更新 JTabbedPane 的外觀？

Susan Sarandon

發布： 2024-12-03 13:19:10

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How Can I Dynamically Update a JTabbedPane's Look and Feel After Adding New Tabs in Swing?

有效更新 JTabbedPane 外觀

在 Swing 應用程式中，JTabbedPane 允許建立選項卡式窗格。有時，需要動態更改應用程式的外觀 (L&F)。但是，這樣做可能並不總是按預期更新 JTabbedPane。

問題：在 JTabbedPane 中新增分頁後，變更 L&F 不會反映在新分頁中。

解決方案：要解決此問題，請考慮以下方法：

import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import java.awt.event.ActionEvent;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class JTabbedPaneLookAndFeelUpdate {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

            JTabbedPane tabbedPane = new JTabbedPane();
            tabbedPane.addTab("Tab 1", new JPanel());

            frame.add(createToolbar(tabbedPane), BorderLayout.NORTH);
            frame.add(tabbedPane, BorderLayout.CENTER);

            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        });
    }

    private static JToolBar createToolbar(JTabbedPane tabbedPane) {
        List<LookAndFeelInfo> availableLooks = new ArrayList<>(Arrays.asList(UIManager.getInstalledLookAndFeels()));
        JComboBox<LookAndFeelInfo> lookAndFeelComboBox = new JComboBox<>(availableLooks.toArray(new LookAndFeelInfo[0]));
        lookAndFeelComboBox.addActionListener(e -> {
            try {
                LookAndFeelInfo selectedLookAndFeel = (LookAndFeelInfo) e.getSource();
                UIManager.setLookAndFeel(selectedLookAndFeel.getClassName());
                SwingUtilities.updateComponentTreeUI(tabbedPane);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        });

        JToolBar toolbar = new JToolBar();
        toolbar.add(new JLabel("Look and Feel:"));
        toolbar.add(lookAndFeelComboBox);
        return toolbar;
    }
}

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解釋：