JComboBox with horizontall scroll bar

[jack morton]

Hi all,
I created this custom ComboBox:

import com.sun.java.swing.*;
import com.sun.java.swing.plaf.basic.*;
 
public class myCombo extends JComboBox{
    public myCombo(){
        super();
        setUI(new myComboUI());
    }
    
    public class myComboUI extends BasicComboBoxUI{
        protected ComboPopup createPopup(){
            BasicComboPopup popup = new BasicComboPopup(comboBox){
                protected JScrollPane createScroller() {
                        return new JScrollPane( list, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                                ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED );
              }
            };
            return popup;
        }
}
  

When i add this ComboBox to a Frame, it has a look and feel diffrent from the others componet
How to resolve that
Regards
Jackm

[Brian Cole]

jack morton wrote:I created this custom ComboBox:

import com.sun.java.swing.*;
import com.sun.java.swing.plaf.basic.*;
 
public class myCombo extends JComboBox{
    public myCombo(){
        super();
        setUI(new myComboUI());
    }
    
    public class myComboUI extends BasicComboBoxUI{
        protected ComboPopup createPopup(){
            BasicComboPopup popup = new BasicComboPopup(comboBox){
                protected JScrollPane createScroller() {
                        return new JScrollPane( list, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                                ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED );
              }
            };
            return popup;
        }
}
  

When i add this ComboBox to a Frame, it has a look and feel diffrent from the others componet
How to resolve that

If you know what L&F will be used, you can override the specific ComboBoxUI for that L&F (though it may have a structure that differs from BasicComboBoxUI, which can make it difficult). Of course it's typical to expect your code to be run under a variety of L&Fs.

This is a general problem with Swing. For this reason you don't really want to override UIs to change functionality, though sometimes there's no other way. I just spent a few minutes looking for some example code I saw somewhere that uses crazy reflection techniques to (effectively) override a method in a dynamic UI delegate, but I couldn't find it. The technique probably wouldn't have worked for your situation anyway.

[edit: spell delegate correctly]

[Darryl Burke]

Just another cross poster.
http://forums.sun.com/thread.jspa?threadID=5369365

[Carlos Hoces]

jack morton wrote:Hi all,
I created this custom ComboBox:
[code]import com.sun.java.swing.*;
import com.sun.java.swing.plaf.basic.*;

public class myCombo extends JComboBox{
public myCombo(){
super();
setUI(new myComboUI());
}
Jackm

In case you extend your class, like:

public class HComboBox extends myCombo{

public HComboBox(){
this.updateUI();
...
}

will set the current LaF during the execution of your class constructor.
This is how I use it, and it works well with Substance LaF, ie.
I guess if you do the same with your class, as is, it'll work equally well.