Change the background of combobox in disabled mode

[Smriti Anchu]

Hi all,

How do i change the background color of the combobox to white in disabled mode.

I have used UIManager.put ( "ComboBox.disabledBackground", Color.WHITE );

This is actually making the background color of the combo box to white. But the problem is when i apply this, the background color of the combo box is changed to white throughout the application. I want the color to change to white only in one screen . How do i do this ? Kindly help me in this regard


regards
smriti

[Gregg Bolinger]

You'll need to create your own renderer for the JComboBox model. In this renderer class you can tell it to set a background color if the index is disabled.

Here is a tutorial on creating a custom renderer.

[Smriti Anchu]

i created a renderer but even then the background is not set to white in disabled mode.

i entered the foll. code in getListCellRenderer method

if (!list.isEnabled) {
setbackground(Color.WHITE)
}

[Michael Dunn]

is this what you're trying to do?

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Testing extends JFrame
{
  public Testing()
  {
 
    setLocation(400,300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String cities[] = {"London","Madrid","New York","Rome","Sydney"};
    final JComboBox cbo = new JComboBox(cities);
    cbo.setBackground(Color.WHITE);
    cbo.setRenderer(new MyRenderer());
    final JCheckBox cbx = new JCheckBox("Enable/Disable",true);
    cbx.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        cbo.setEnabled(cbx.isSelected());}});
    JPanel jp = new JPanel(new GridLayout(2,1));
    jp.add(cbo);
    jp.add(cbx);
    getContentPane().add(jp);
    pack();
  }
  class MyRenderer extends JLabel implements ListCellRenderer
  {
    public Component getListCellRendererComponent(JList list,Object value,
                        int index,boolean isSelected,boolean cellHasFocus)
    {
      this.setText((String)value);
      this.setOpaque(false);//<-----------------
      return this;
    }
  }
  public static void main(String args[]){new Testing().setVisible(true);}
}

[Smriti Anchu]

No,
The code is written below:

 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Testing extends JFrame{  
public Testing()  {     
setLocation(400,300);    
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    
String cities[] = {"London","Madrid","New York","Rome","Sydney"};    
final JComboBox cbo = new JComboBox(cities);    
cbo.setBackground(Color.WHITE);    
cbo.setRenderer(new MyRenderer());    
final JCheckBox cbx = new JCheckBox("Enable/Disable",true);    cbx.addActionListener(new ActionListener(){      
public void actionPerformed(ActionEvent ae){        
cbo.setEnabled(cbx.isSelected());
}});    
JPanel jp = new JPanel(new GridLayout(2,1));    
jp.add(cbo);    
jp.add(cbx);    
getContentPane().add(jp);    
pack();  
}  
class MyRenderer extends JLabel implements ListCellRenderer  {    
public Component getListCellRendererComponent(JList list,Object value, int index,boolean isSelected,boolean cellHasFocus)    {      
this.setText((String)value);      
//this.setOpaque(false);//<-----------------      
if (!list.isEnabled) {
setBackground(Color.white);
setForeground(Color.black);
}
return this;    
}  
}  
public static void main(String args[]){
new Testing().setVisible(true);
}
}