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toolbar button with drop-down menu

Posted on 2001-07-18
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Last Modified: 2012-05-04

How do I make a toolbar button (icon) with a drop-down menu to select from. I see this everywhere in browsers, even in many Java applications (like JBuilder). It is even in the Java L&F guidelines, but they don't tell you how to do it.

Anyone know? What it should be is an icon (or even a combo box looking thing with an icon), and when you click on it you get a standard menu dropped-down with menu items (ie. text) to select from. After choosing the item, the icon changes to reflect the selection.

Thanks in advance,
Joel
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Question by:joeltt
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3 Comments
 
LVL 1

Expert Comment

by:poluru
ID: 6297082
have a look at the following code

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

public class PopUp extends JFrame implements ActionListener
{
     JPopupMenu pop;
     JButton jb;
     public PopUp()
     {
          super("PopUpMenu Demo");
          JToolBar bar=new JToolBar();
          jb=new JButton("Pop");
          bar.add(jb);
          pop=new JPopupMenu();
          pop.add("First Action");
          pop.add("Second Action");
          pop.add("Third Action");
          pop.add("Fourth Action");
          pop.setInvoker(jb);
          jb.addActionListener(this);
          getContentPane().add(bar);
          pack();
          setVisible(true);

     }
     public void actionPerformed(ActionEvent ae)
     {
          pop.show(jb,10,10);
     }
     public static void main(String args[])
     {
          new PopUp();
     }
}

0
 
LVL 3

Author Comment

by:joeltt
ID: 6302279
I didn't see how to grab the selection event from the Popup menu. How do I get it so I can change the icon on the button?

Thanks,
Joel
0
 
LVL 1

Accepted Solution

by:
poluru earned 100 total points
ID: 6307133
import javax.swing.*;
import java.awt.event.*;

public class PopUp extends JFrame implements ActionListener
{
     JPopupMenu pop;
     JButton jb;
     JMenuItem jm[]=new JMenuItem[4];

     public PopUp()
     {
          super("PopUpMenu Demo");
          JToolBar bar=new JToolBar();
          jb=new JButton("Pop");
          bar.add(jb);
          pop=new JPopupMenu();
          jm[0]=pop.add("First Action");
          jm[1]=pop.add("Second Action");
          jm[2]=pop.add("Third Action");
          jm[3]=pop.add("Fourth Action");
          for(int i=0;i<jm.length;i++)
          {
               jm[i].addActionListener(this);
          }
          pop.setInvoker(jb);
          jb.addActionListener(this);
          getContentPane().add(bar);
          pack();
          setVisible(true);

     }
     public void actionPerformed(ActionEvent ae)
     {
          if(ae.getSource()==jm[0])
          {
               /*
                 here u can do what ever u want
                 i.e. when first MenuItem is Clicked
                 like changing the button icon...
               */
               JOptionPane.showMessageDialog(this,"First Action Clicked");
          }
          else if(ae.getSource()==jm[1])
          {
               JOptionPane.showMessageDialog(this,"Second Action Clicked");
          }
          else if(ae.getSource()==jm[2])
          {
               JOptionPane.showMessageDialog(this,"Third Action Clicked");
          }
          else if(ae.getSource()==jm[3])
          {
               JOptionPane.showMessageDialog(this,"Fourth Action Clicked");
          }
          else
          {
               java.awt.Dimension d=jb.getPreferredSize();
               pop.show(jb,0,d.height);
          }
     }
     public static void main(String args[])
     {
          new PopUp();
     }
}
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