java - 添加鼠标监听器后无法单击选项卡

Question

我一直在尝试将弹出菜单添加到 JTabbedPane 的选项卡标题，我已设法按如下方式完成:

        tabbedPane.setTabComponentAt(a+2, x);


        x.addMouseListener(new MouseListener() {

            @Override
            public void mouseReleased(MouseEvent e) {
                maybeShowPopup(e);

            }

            @Override
            public void mousePressed(MouseEvent e) {
                maybeShowPopup(e);
            }


            @Override
            public void mouseExited(MouseEvent e) {}

            @Override
            public void mouseEntered(MouseEvent e) {}

            @Override
            public void mouseClicked(MouseEvent e) {}


            private void maybeShowPopup(MouseEvent e) {
                if (e.isPopupTrigger()) {
                    popUpMenuTab.show(e.getComponent(),
                               e.getX(), e.getY());
                }
            }

        });

但是，如果您右键单击，您将获得上下文菜单，但如果您左键单击，则没有任何反应。有谁知道我如何才能在选项卡上恢复原始功能，以便它在左键单击时变为 Activity 状态，但在右键单击时也有上下文菜单。

一个SSCCE如下

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JTabbedPane;

public class JTabbedPaneDemoextends JPanel {
    private JPopupMenu menu = new JPopupMenu();

    public JTabbedPaneDemo() {
        ImageIcon icon = new ImageIcon("java-swing-tutorial.JPG");
        JTabbedPane jtbExample = new JTabbedPane();

        JPanel jplInnerPanel1 = createInnerPanel("Tab 1 Contains Tooltip and Icon");
        jtbExample.addTab("One", icon, jplInnerPanel1, "Tab 1");
        jtbExample.setSelectedIndex(0);

        JPanel jplInnerPanel2 = createInnerPanel("Tab 2 Contains Icon only");
        jtbExample.addTab("Two", icon, jplInnerPanel2);

        JPanel jplInnerPanel3  = createInnerPanel("Tab 3 Contains Tooltip and Icon");
        jtbExample.addTab("Three", icon, jplInnerPanel3, "Tab 3");

        JPanel jplInnerPanel4 = createInnerPanel("Tab 4 Contains Text only");
        jtbExample.addTab("Four", jplInnerPanel4);

        menu.add(new JMenuItem("Item 1"));
        menu.add(new JMenuItem("Item 2"));

        JLabel tab4Label = new JLabel();
        tab4Label.setText("Four");  

        jtbExample.setTabComponentAt(3, tab4Label);


        tab4Label.addMouseListener(new MouseListener() {

            @Override
            public void mouseReleased(MouseEvent e) {
                maybeShowPopup(e);

            }

            @Override
            public void mousePressed(MouseEvent e) {
                maybeShowPopup(e);
            }


            @Override
            public void mouseExited(MouseEvent e) {}

            @Override
            public void mouseEntered(MouseEvent e) {}

            @Override
            public void mouseClicked(MouseEvent e) {}


            private void maybeShowPopup(MouseEvent e) {
                if (e.isPopupTrigger()) {
                    menu.show(e.getComponent(),
                               e.getX(), e.getY());
                }
            }

        });


        //Add the tabbed pane to this panel.
        setLayout(new GridLayout(1, 1)); 
        add(jtbExample);
    }

    protected JPanel createInnerPanel(String text) {
        JPanel jplPanel = new JPanel();
        JLabel jlbDisplay = new JLabel(text);
        jlbDisplay.setHorizontalAlignment(JLabel.CENTER);
        jplPanel.setLayout(new GridLayout(1, 1));
        jplPanel.add(jlbDisplay);
        return jplPanel;
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("TabbedPane Source Demo");
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);}
        });

        frame.getContentPane().add(new JTabbedPaneDemo(), 
                                   BorderLayout.CENTER);
        frame.setSize(400, 125);
        frame.setVisible(true);
    }
}

在这里您可以左键单击选项卡 4 但不能右键单击。

Answer 1

更新:巧合的是，这个答案使用与@Neifen 的 answer 相同的方法。 ，但该示例可能值得保留。

设置选项卡式 Pane 模型的选定索引似乎有效:getModel().setSelectedIndex(3)。我已经更新了您的示例以使用事件分派(dispatch)线程并成为 sscce通过使其独立。

import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JTabbedPane;
import javax.swing.UIManager;

/** @see https://stackoverflow.com/questions/7818752 */
public class JTabbedPaneDemo extends JPanel {

    private JPopupMenu menu = new JPopupMenu();

    public JTabbedPaneDemo() {
        Icon icon = UIManager.getIcon("html.pendingImage");
        final JTabbedPane jtb = new JTabbedPane();

        JPanel jplInnerPanel1 = createInnerPanel("Tab 1: Tooltip and Icon");
        jtb.addTab("One", icon, jplInnerPanel1, "Tab 1");
        jtb.setSelectedIndex(0);

        JPanel jplInnerPanel2 = createInnerPanel("Tab 2: Icon only");
        jtb.addTab("Two", icon, jplInnerPanel2);

        JPanel jplInnerPanel3 = createInnerPanel("Tab 3: Tooltip and Icon");
        jtb.addTab("Three", icon, jplInnerPanel3, "Tab 3");

        JPanel jplInnerPanel4 = createInnerPanel("Tab 4: Text only");
        jtb.addTab("Four", jplInnerPanel4);

        menu.add(new JMenuItem("Item 1"));
        menu.add(new JMenuItem("Item 2"));

        JLabel tab4Label = new JLabel();
        tab4Label.setText("Four");
        jtb.setTabComponentAt(3, tab4Label);
        tab4Label.addMouseListener(new MouseAdapter() {

            @Override
            public void mouseReleased(MouseEvent e) {
                maybeShowPopup(e);

            }

            @Override
            public void mousePressed(MouseEvent e) {
                maybeShowPopup(e);
            }

            private void maybeShowPopup(MouseEvent e) {
                jtb.getModel().setSelectedIndex(3);
                if (e.isPopupTrigger()) {
                    menu.show(e.getComponent(), e.getX(), e.getY());
                }
            }
        });

        setLayout(new GridLayout());
        add(jtb);
    }

    private JPanel createInnerPanel(String text) {
        JPanel jplPanel = new JPanel();
        JLabel jlbDisplay = new JLabel(text);
        jlbDisplay.setHorizontalAlignment(JLabel.CENTER);
        jplPanel.setLayout(new GridLayout(1, 1));
        jplPanel.add(jlbDisplay);
        return jplPanel;
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame frame = new JFrame("TabbedPane Source Demo");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new JTabbedPaneDemo());
                frame.pack();
                frame.setSize(400, 125);
                frame.setVisible(true);
            }
        });
    }
}