Microba controls

Another similar solution that does not depend on JGoodies:

/**
* Customized DatePicker UI delegate object that sets the date value to
null if
* the textfield is empty or contains solely whitespace
*/
public class MyDatePickerUI extends BasicDatePickerUI implements
FocusListener {
static {
UIManager.put("microba.DatePickerUI", "MyDatePickerUI");
}

public static ComponentUI createUI(JComponent c) {
return new MyDatePickerUI();
}

@Override
protected void installComponents() {
super.installComponents();
field.addFocusListener(this);
}

public void focusGained(FocusEvent e) {
// No additional behavior
}

public void focusLost(FocusEvent e) {
if (((JFormattedTextField)e.getComponent()).getText().trim().equals(""))
{
((JFormattedTextField)e.getComponent()).setValue(null);
}
}
}

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I have a solution for that problem

Override the BasicDatePickerUI

public class MyDatePickerUI extends BasicDatePickerUI {

public static ComponentUI createUI(final JComponent c) {
return new MyDatePickerUI();
}

/** {@inheritDoc} */
@Override
protected void installComponents() {
super.installComponents();
field.setFormatterFactory(new DefaultFormatterFactory(
new EmptyDateFormatter(peer.getDateFormat())));
}

}
And reset the formatter on the field. Use the EmptyDateFormatter from
JGoodies that returns a null value when an empty string is entered.

//change the UIManager
new MicrobaComponent(); //you have to do this, because the first time a
MicrobaComponent is created the Microba.init() is called in a static
constructor
UIManager.put("microba.DatePickerUI",
"xxx.xxx.MyDatePickerUI");