CODEWITHSUNDEEP
javaswinglayouttabsjtabbedpane
kajacx
kajacx

Reputation: 12959

How to set width of JTabbed pane to fit the tabs

I have 3 tabs in my JTabbedPane and I want to have them next to each other, like this: How it should looked, tabs next to each other

However, I didn't find how to automaticly set the width of the JTabbedPane, so that the tabs would fit next to each other, so I just set the width by tabs.setPreferredSize(new Dimension(210, 300));

This has of course many problems, mainly it doesn't even work on all systems: How it shouldn't look, tabs in 2 rows

Not to mention problems with renaming or adding/removing tabs.

So, is there a good way to calcuate the width of the tab names, to then pass into the setPrefferedSize() method, or better yet, some setWidthToFitTabs() method?

EDIT: minimal complete example:

SwingUtilities.invokeLater(() -> {

    JFrame frame = new JFrame("Tabs text");
    JTabbedPane tabs = new JTabbedPane();

    tabs.addTab("Tab1", new JLabel("Content1"));
    tabs.addTab("Tab2", new JLabel("Content2"));
    tabs.addTab("Tab3", new JLabel("Content3"));
    tabs.addTab("Tab4", new JLabel("Content4"));

    for (int i = 0; i < tabs.getTabCount(); i++) {
        System.out.println(tabs.getUI().getTabBounds(tabs, i));
    }

    frame.add(tabs);

    frame.pack();
    frame.setVisible(true);

});

Result:

java.awt.Rectangle[x=2,y=59,width=-8,height=19]
java.awt.Rectangle[x=2,y=40,width=-8,height=19]
java.awt.Rectangle[x=2,y=21,width=-8,height=19]
java.awt.Rectangle[x=2,y=2,width=49,height=19]

Tabs in the small, reproducable example

Upvotes: 2

Views: 2442

Answers (1)

camickr
camickr

Reputation: 324207

but it returns -8 for the first 2 tabs. Only the third tab has correct width of 65.

Seems like a bit of a bug to me. In my code below I got around this by invoking pack() twice.

Here is my implementation that overrides the getPreferredSize() method (with the above hack):

import java.awt.*;
import javax.swing.*;

public class Main
{
    public static void main(String[] args) throws Exception
    {
        SwingUtilities.invokeLater(() ->
        {

            JFrame frame = new JFrame("Tabs text");
            JTabbedPane tabs = new JTabbedPane()
            {
                @Override
                public Dimension getPreferredSize()
                {
                    int tabsWidth = 0;

                    for (int i = 0; i < getTabCount(); i++) {
                        tabsWidth += getBoundsAt(i).width;
                    }

                    Dimension preferred = super.getPreferredSize();

                    preferred.width = Math.max(preferred.width, tabsWidth);

                    return preferred;
                }
            };

            tabs.addTab("Tab1", new JLabel("Content1"));
            tabs.addTab("Tab2", new JLabel("Content2"));
            tabs.addTab("Tab3", new JLabel("Content3"));
            tabs.addTab("Tab4", new JLabel("Content4"));


            frame.add(tabs);

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

Upvotes: 4

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