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JComboBox with muticolor items??

Sajee Joseph
Ranch Hand

Joined: Jan 17, 2001
Posts: 200
Hi,
I have a JComboBox which displays a set of names like
"Sam","Saj","Jane"..... and so on. Now depending on some condition i need the names in the JComboBox to have different colors. I need just 2 colors.
How do i do that.
Code exampples will be helpful
Waiting for ur replies
Regards
Saj
john mattucci
Ranch Hand

Joined: Nov 03, 2000
Posts: 331
This answer was given to me several weeks back and it should also
answer your question
You have to write your own ListCellRenderer and a data class. That is for instance extend JLabel and implement the appropriate interface. Please take a look at the api documentation of the ListCellRenderer interface. The only to implement method is
public Component getListCellRendererComponent(...)
So you have to define your data class, for instance:
public class MyData
{
private String mDescription = "default";
public String getDescription()
{
return mDescription;
}
public void setDescription(String description)
{
mDescription = description != null ? description : "default";
}
}
and define the cell renderer:
class MyDataCellRenderer extends JLabel implements ListCellRenderer
{
public MyDataCellRenderer()
{
setOpaque(true);
}
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
{
if (value instanceof MyData)
{
MyData myData = (MyData) value;
setText(myData.getDescription());
if (myData.isCompleted())
{
if (isSelected)
{
// change the colors to the desired:
setBackground(list.getSelectionBackground());
setForeground(Color.red);
}
else
{
// change the colors to the desired:
setBackground(list.getBackground());
setForeground(Color.red);
}
}
else
{
if (isSelected)
{
setBackground(list.getSelectionBackground());
setForeground(list.getSelectionForeground());
}
else
{
setBackground(list.getBackground());
setForeground(list.getForeground());
}
}
}
return this;
}
}
Finally you have to make your ListCellRenderer the cell renderer of the JList: myJList.setCellRenderer(...);
and you add elements of MyData to the JList...
You can find another example in the api documentation of JList...
Good luck
Tom

 
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