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I am attempting to build a combobox that uses a table
instead of a list. The user should be able to select
a row in the table. As the mouse moves over the table,
the row should be highlighted.

I am looking at the source code for the combobox and
it is overwhelming. Does someone know if something
like the above has been implemented? If not, any suggest
as how I go about implement such combobox?

Thanks.

You should not look at re-implementing JComboBox but simply implement a
custom ListCellRenderer. Instead of the default JLabel used by the
DefaultListCellRenderer create on that extends JTable and work on that
one.

Bart

lizard <> wrote in
news ldomain:

>
> I am attempting to build a combobox that uses a table
> instead of a list. The user should be able to select
> a row in the table. As the mouse moves over the table,
> the row should be highlighted.
>
> I am looking at the source code for the combobox and
> it is overwhelming. Does someone know if something
> like the above has been implemented? If not, any suggest
> as how I go about implement such combobox?
>
> Thanks.
>
>

Bart's suggestion (a ListCellRenderer that extends JTable) is indeed the
way to go. I just wanted to ask, when you get it to work, would you mind
posting the code here or on a website somewhere? Sounds like something
that could potentially be useful to others as well.

Here's a working example, not perfect, but could be used as starters.

import java.awt.Component;
import java.awt.FlowLayout;
import javax.swing.*;
import javax.swing.table.AbstractTableModel;

/**
* @author Bart Cremers
*/
public class TableCombo extends JFrame {

protected void frameInit() {
super.frameInit();

setLayout(new FlowLayout());

JComboBox box = new JComboBox(new Row[] {
new Row("Row 1", "Row 1 value", "Row 1 Extra"),
new Row("Row 2", "Row 2 value", "Row 2 Extra"),
new Row("Row 3", "Row 3 value", "Row 3 Extra"),
new Row("Row 4", "Row 4 value", "Row 4 Extra"),
new Row("Row 5", "Row 5 value", "Row 5 Extra"),
new Row("Row 6", "Row 6 value", "Row 6 Extra"),
new Row("Row 7", "Row 7 value", "Row 7 Extra"),
new Row("Row 8", "Row 8 value", "Row 8 Extra"),
new Row("Row 9", "Row 9 value", "Row 9 Extra"),
});

box.setRenderer(new RowCellRenderer());

add(box);
}

public static void main(String[] args) {
JFrame f = new TableCombo();
f.pack();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(EXIT_ON_CLOSE);
f.setVisible(true);
}

private static class Row {

private String id, val, extra;

public Row(String id, String val, String extra) {
this.id = id;
this.val = val;
this.extra = extra;
}

public String getId() {
return id;
}

public String getVal() {
return val;
}

public String getExtra() {
return extra;
}
}

private static class RowCellRenderer extends JTable implements
ListCellRenderer {

public RowCellRenderer() {

setSelectionMode(ListSelectionModel.SINGLE_INTERVA L_SELECTION);
}

public Component getListCellRendererComponent(JList list,
Object value, int index, boolean isSelected,
boolean
cellHasFocus) {
setModel(new RowTableModel((Row) value));
if (isSelected) {
getSelectionModel().setSelectionInterval(0, 0);
}
return this;
}
}

private static class RowTableModel extends AbstractTableModel {

private Row row;

public RowTableModel(Row row) {
this.row = row;
}

public int getRowCount() {
return 1;
}

public int getColumnCount() {
return 3;
}

public Object getValueAt(int rowIndex, int columnIndex) {
switch(columnIndex) {
case 0:
return row.getId();
case 1:
return row.getVal();
case 2:
return row.getExtra();
}
return null;
}
}
}

Bart

"Bart Cremers" <> wrote in news:1138606078.948149.194740
@g14g2000cwa.googlegroups.com:

> Here's a working example, not perfect, but could be used as starters.
>

<code snipped>

>
> Bart
>
>

Looks nice, thanks

On Sun, 29 Jan 2006 23:27:58 -0800, Bart Cremers wrote:

> Here's a working example, not perfect, but could be used as starters.


Thanks.

Assume that I have a large number of columns (20+) and that the
first column contains the ID of each rows. Can I display the
ID in the field above the dropped down table rather than the
entire row?

And what if I rather than constructs a table for each list item,
can I simply use a single table instead of a list of tables? This
is because it would be nice to have the headers.

Displaying only the ID in the field is just a matter of working on the
renderers.

The reason I use one table per row is that the cellrenderers in a List
require one single renderer per row. Implementing something like you
said is best achieved through your own component I think.

[textfield][button]
[window with JTable ]

Is not that hard to implement.

Regards,

Bart

[valprivate]

Originally Posted by Bart Cremers

Displaying only the ID in the field is just a matter of working on the
renderers.

The reason I use one table per row is that the cellrenderers in a List
require one single renderer per row. Implementing something like you
said is best achieved through your own component I think.

[textfield][button]
[window with JTable ]

Is not that hard to implement.

Regards,

Bart

Hi, guys! It's really good working example but I can't implement only one column dislpaying in comboBox. Need help.