如何向JTabbedPane标签添加关闭按钮？

Question

I'm working in with a JTabbedPane, I need to add a close button in the tabs to close the current one.

I have been searching and as I understand I must extend from JPanel and add the close button as they say here But, is there a way to add the close buttons extending JTabbedPane or is there a easier way to do it?

Thanks in advance, I really appreciate your time and your help.

Answer 1

Essentially, you're going to need to supply a "renderer" for the tab. Take a look at JTabbedPane.setTabComponentAt(...) for more information.

The basic idea is to supply a component that will be laid out on the tab.

I typically create a JPanel, onto which I add a JLabel (for the title) and, depending on what I want to display, some kind of control that acts as the close action.

tabPane.addTab(title, tabBody);
int index = tabPane.indexOfTab(title);
JPanel pnlTab = new JPanel(new GridBagLayout());
pnlTab.setOpaque(false);
JLabel lblTitle = new JLabel(title);
JButton btnClose = new JButton("x");

GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;

pnlTab.add(lblTitle, gbc);

gbc.gridx++;
gbc.weightx = 0;
pnlTab.add(btnClose, gbc);

tabPane.setTabComponentAt(index, pnlTab);

btnClose.addActionListener(myCloseActionHandler);

Now somewhere else, I establish the action handler...

public class MyCloseActionHandler implements ActionListener {

    public void actionPerformed(ActionEvent evt) {

        Component selected = tabPane.getSelectedComponent();
        if (selected != null) {

            tabPane.remove(selected);
            // It would probably be worthwhile getting the source
            // casting it back to a JButton and removing
            // the action handler reference ;)

        }

    }

}

Now, you just as easily use any component you like and attach a mouse listener to it and monitor the mouse clicks...

Updated

The above example will only remove the currently active tab, there are a couple of ways to fix this.

The best is to probably provide some means for the action to find the tab it's associated with...

public class MyCloseActionHandler implements ActionListener {

    private String tabName;

    public MyCloseActionHandler(String tabName) {
        this.tabName = tabName;
    }

    public String getTabName() {
        return tabName;
    }

    public void actionPerformed(ActionEvent evt) {

        int index = tabPane.indexOfTab(getTabName());
        if (index >= 0) {

            tabPane.removeTabAt(index);
            // It would probably be worthwhile getting the source
            // casting it back to a JButton and removing
            // the action handler reference ;)

        }

    }

}   

This uses the name of tab (as used with JTabbedPane#addTab ) to find and then remove the tab and its associated component...

Answer 2

I found a tab example (from the java site) that appears to do that, at least in theirs. (Though I thought, when I tried it in the past, that it also closed the currently selected tab, though it works properly when you run their example, though I think when I updated it to work on a tabbed java notepad, it was closing the currently selected tab, though maybe I did it wrong.

http://docs.oracle.com/javase/tutorial/displayCode.html?code=http://docs.oracle.com/javase/tutorial/uiswing/examples/components/TabComponentsDemoProject/src/components/ButtonTabComponent.java

Yes, my thing is working now! This WILL work for the actual tab, rather than the currently selected tab!

Answer 3

Hopefully you have got the answer to your question. I want to give a link that was very useful for me.

JTabbedPane with a close button

Here is some code as well.

public static void createAndShowGUI()
{
    JFrame frame = new JFrame("Tabs");
    frame.setMinimumSize(new Dimension(500, 200));
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JTabbedPane tabbedPane = new JTabbedPane();

    JPanel panel = new JPanel();
    panel.setOpaque(false);
    tabbedPane.add(panel);
    tabbedPane.setTabComponentAt(tabbedPane.indexOfComponent(panel), getTitlePanel(tabbedPane, panel, "Tab1"));

    JPanel panel1 = new JPanel();
    panel1.setOpaque(false);
    tabbedPane.add(panel1);
    tabbedPane.setTabComponentAt(tabbedPane.indexOfComponent(panel1), getTitlePanel(tabbedPane, panel1, "Tab2"));

    JPanel panel2 = new JPanel();
    panel2.setOpaque(false);
    tabbedPane.add(panel2);
    tabbedPane.setTabComponentAt(tabbedPane.indexOfComponent(panel2), getTitlePanel(tabbedPane, panel2, "Tab3"));

    JPanel panel3 = new JPanel();
    panel3.setOpaque(false);
    tabbedPane.add(panel3);
    tabbedPane.setTabComponentAt(tabbedPane.indexOfComponent(panel3), getTitlePanel(tabbedPane, panel3, "Tab4"));

    frame.add(tabbedPane);

    // Display the window.
    frame.pack();
    frame.setVisible(true);
}

Answer 4

I made some changes in the code of oracle.

http://docs.oracle.com/javase/tutorial/displayCode.html?code=http://docs.oracle.com/javase/tutorial/uiswing/examples/components/TabComponentsDemoProject/src/components/ButtonTabComponent.java

Giving the possibility to add an icon to the tab , plus the close tab button. Hope that helps.

public static void addTag(JTabbedPane tab, String title, Icon icon, int index){
     MouseListener close = new MouseAdapter() {

        @Override
        public void mouseClicked(MouseEvent e) {
            //your code to remove component
            //I use this way , because I use other methods of control than normal: tab.remove(int index);
        }

    };
    final ButtonClose buttonClose = new ButtonClose (title, icon, close );

    tab.setTabComponentAt(index, buttonClose);
    tab.validate();
    tab.setSelectedIndex(index);

}

public class ButtonClose extends JPanel {

public ButtonClose(final String title, Icon icon, MouseListener e) {
    JLabel ic = new JLabel(icon);
    ic.setSize(icone.getIconWidth(), icone.getIconHeight());

    JLabel text= new JLabel(title);
    text.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));

    ButtonTab button = new ButtonTab();
    button.addMouseListener(e);
    button.setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));

    JPanel p = new JPanel();
    p.setSize(getWidth() - icone.getIconWidth(), 15);
    p.add(text);
    p.add(button);

    add(ic);
    add(p);
}

private class ButtonTab extends JButton {

    public ButtonTab() {
        int size = 13;
        setPreferredSize(new Dimension(size, size));
        setToolTipText("Close");

        setUI(new BasicButtonUI());

        setFocusable(false);
        setBorderPainted(false);

        addMouseListener(listener);
        setRolloverEnabled(true);
    }

    @Override
    public void updateUI() {
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g.create();

        if (getModel().isPressed()) {
            g2.translate(1, 1);
        }
        g2.setStroke(new BasicStroke(2));
        g2.setColor(new Color(126, 118, 91));

        if (getModel().isRollover()) {
            g2.setColor(Color.WHITE);
        }

        int delta = 3;
        g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
        g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
        g2.dispose();
    }
}

private final MouseListener listener = new MouseAdapter() {
    @Override
    public void mouseEntered(MouseEvent e) {
        Component component = e.getComponent();
        if (component instanceof AbstractButton) {
            AbstractButton button = (AbstractButton) component;
            button.setContentAreaFilled(true);
            button.setBackground(new Color(215, 65, 35));
        }
    }

    @Override
    public void mouseExited(MouseEvent e) {
        Component component = e.getComponent();
        if (component instanceof AbstractButton) {
            AbstractButton button = (AbstractButton) component;
            button.setContentAreaFilled(false); //transparent
        }
    }
};

}

Answer 5

Check out Peter-Swing here . It has a JClosableTabbedPane class in it, as well as many others.

When you download the jar file you can run it and have examples of all the classes.

Answer 6

You can have a JLabel named "x" and use the mouseListener

 private final JLabel l = new JLabel(); // this is the label for tabbedPane
 private final JLabel b = new JLabel("x");//Close Button
 if (closeable)
        {
            b.setToolTipText("Click to close");

            b.setOpaque(false);
            b.setBackground(Color.gray);

            b.addMouseListener(new MouseAdapter()
            {
                @Override
                public void mouseExited(MouseEvent e)
                {
                    b.setBorder(bordere);
                    b.setOpaque(false);
                }

                @Override
                public void mouseEntered(MouseEvent e)
                {
                    b.setBorder(borderl);
                }

                @Override
                public void mouseReleased(MouseEvent e)
                {
                    b.setOpaque(false);
                    b.repaint();

                    if (b.contains(e.getPoint()))
                    {
                        b.setBorder(borderl);

                        if (confirmTabClosing())
                        {
                            tab.remove(tabIndex());
                            if(tab.getTabCount() == 0)
                                spacialTabComponent.maximizeOrRestore.doClick();
                        }
                    }
                    else
                        b.setBorder(bordere);

                }

                @Override
                public void mousePressed(MouseEvent e)
                {
                    b.setOpaque(true);
                    b.repaint();
                }
            });

            b.setBorder(bordere);
            add(b, getLeftAlignedBothFilledGBC(1, 0, new Insets(0, 0, 0, 0), 0, 0));
        }



    }

Answer 7

jbCloseButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int index = jtbMainTabbedPane.indexOfTabComponent(jbCloseButton);
                jtbMainTabbedPane.remove(index);
            }
});