JtabbedPane equally size tab width..

Question

Hello,
I have a JTabbedPane with about 7 tabs, but the tab names are mostly short and the sum width of the tabs takes up about 80% of the TabbedPane.
I'd like for the tab widths to take up the entire 100% of the tabbedPane (just a pref.) It would be nice if I could set the min tab width to 1/7 tabbedPane width. How can I set the width of each tab??

Answer 1

this might start you off - needs lots of testing
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Testing extends JFrame
  JTabbedPane tp = new JTabbedPane();
  int tabPaneWidth;
  int tabCounter;
  public Testing()
    setLocation(300,100);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    for(int x = 0; x < 3; x++)
      JPanel p = new JPanel();
      p.setPreferredSize(new Dimension(600,400));
      tp.addTab(""+(++tabCounter),p);
    JButton btn = new JButton("Add Tab");
    JPanel p = new JPanel();
    p.add(btn);
    getContentPane().add(tp,BorderLayout.CENTER);
    getContentPane().add(p,BorderLayout.SOUTH);
    tabPaneWidth = tp.getPreferredSize().width;
    tp.setUI(new MyUI());
    setResizable(false);//otherwise needs a componentListener
    pack();
    btn.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        tp.addTab(""+(++tabCounter),new JPanel());}});
  class MyUI extends javax.swing.plaf.basic.BasicTabbedPaneUI
    protected int calculateTabWidth(int tabPlacement,int tabIndex, FontMetrics metrics)
      Insets margin = getInsets();
      return (int)((tabPaneWidth - margin.left - margin.right)/tp.getTabCount());
  public static void main(String[] args){new Testing().setVisible(true);}
}