Weird Behavior: Sizing Problem with JComboBox in a JTable
Hi
I'm using JComboBox as a cell in a JTable. But the problem is when the length of the popup menu in the combobox exceeds that of the frame and the selection starts behaving erratically. I suspect this might be due to a reported bug # 4372285.
So now I'm using a stepped combobox as suggested in one the posting in this forum:
http://forum.java.sun.com/thread.jsp?forum=57&thread=121540 and I'm able to specify the width of the popupmenu of the combo as I want.
But I can't make this width hard coded, I mean it doesn't make sense to make the width of the popup less than the cell width of its container cell, nor do I want to exceed its length. I'm OK with the data truncation in the popup but I would like to make the width of the popup exactly the same as the cell width.
Is there a way I can get get this width to specify it for teh pop-up width? Any other way to do this?
Pls halp asap.
Thanks
Abhi
I'm attaching the code of stepped combo-box in case you don't wanna visit the link provioded:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.metal.*;
import javax.swing.plaf.basic.*;
import javax.swing.border.*;
public class SteppedComboBoxExample extends JFrame {
public SteppedComboBoxExample() {
super("SteppedComboBox Example");
String[] str = {
"A",
"abcdefghijklmnopqrstuvwxyz",
"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
"0123456789"
};
SteppedComboBox combo = new SteppedComboBox(str);
Dimension d = combo.getPreferredSize();
combo.setPreferredSize(new Dimension(50, d.height));
combo.setPopupWidth(d.width);
getContentPane().setLayout(new FlowLayout());
getContentPane().add(combo);
}
class SteppedComboBoxUI extends MetalComboBoxUI {
protected ComboPopup createPopup() {
BasicComboPopup popup = new BasicComboPopup( comboBox ) {
public void show() {
Dimension popupSize = ((SteppedComboBox)
comboBox).getPopupSize();
popupSize.setSize( popupSize.width,
getPopupHeightForRowCount( comboBox.getMaximumRowCount
() ) );
Rectangle popupBounds = computePopupBounds( 0,
comboBox.getBounds().height, popupSize.width,
popupSize.height);
scroller.setMaximumSize( popupBounds.getSize() );
scroller.setPreferredSize( popupBounds.getSize() );
scroller.setMinimumSize( popupBounds.getSize() );
list.invalidate();
int selectedIndex = comboBox.getSelectedIndex();
if ( selectedIndex == -1 ) {
list.clearSelection();
} else {
list.setSelectedIndex( selectedIndex );
}
list.ensureIndexIsVisible( list.getSelectedIndex() );
setLightWeightPopupEnabled(
comboBox.isLightWeightPopupEnabled() );
show( comboBox, popupBounds.x, popupBounds.y );
}
};
popup.getAccessibleContext().setAccessibleParent(comboBox);
return popup;
}
}
public class SteppedComboBox extends JComboBox {
protected int popupWidth;
public SteppedComboBox(ComboBoxModel aModel) {
super(aModel);
setUI(new SteppedComboBoxUI());
popupWidth = 0;
}
public SteppedComboBox(final Object[] items) {
super(items);
setUI(new SteppedComboBoxUI());
popupWidth = 0;
}
public SteppedComboBox(Vector items) {
super(items);
setUI(new SteppedComboBoxUI());
popupWidth = 0;
}
public void setPopupWidth(int width) {
popupWidth = width;
}
public Dimension getPopupSize() {
Dimension size = getSize();
if (popupWidth < 1) popupWidth = size.width;
return new Dimension(popupWidth, size.height);
}
}
public static void main (String args[]) {
SteppedComboBoxExample f = new SteppedComboBoxExample();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.setSize (300, 100);
f.show();
}
}
