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/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists.swing;
import ca.odell.glazedlists.EventList;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.SwingUtilities;
import javax.swing.event.ListDataEvent;
/**
* A combo box model for displaying Glazed Lists in a combo box.
*
* <p>The DefaultEventComboBoxModel class is <strong>not thread-safe</strong>. Unless
* otherwise noted, all methods are only safe to be called from the event
* dispatch thread. To do this programmatically, use {@link SwingUtilities#invokeAndWait(Runnable)}
* and wrap the source list (or some part of the source list's pipeline) using
* {@link GlazedListsSwing#swingThreadProxyList(EventList)}.
*
* <p>The implementation of {@link #setSelectedItem} and {@link #getSelectedItem}
* is not in any way tied to the contents of the list.
*
* @see <a href="http://publicobject.com/glazedlists/tutorial/">Glazed Lists Tutorial</a>
*
* @author <a href="mailto:jesse@swank.ca">Jesse Wilson</a>
*/
public class DefaultEventComboBoxModel<E> extends DefaultEventListModel<E> implements ComboBoxModel {
/** the currently selected item which typically belong to the source list */
private Object selected;
/**
* Creates a new combo box model that contains the elements of the given
* <code>source</code> and tracks further changes made to it.
*
* @param source the EventList that provides the elements
*/
public DefaultEventComboBoxModel(EventList<E> source) {
this(source, false);
}
/**
* Creates a new combo box model that contains the elements of the given
* <code>source</code> and tracks further changes made to it.
*
* @param source the EventList that provides the elements
* @param diposeSource <code>true</code> if the source list should be disposed when disposing
* this model, <code>false</code> otherwise
*/
protected DefaultEventComboBoxModel(EventList<E> source, boolean disposeSource) {
super(source, disposeSource);
}
/**
* Gets the currently selected item.
*/
public Object getSelectedItem() {
return selected;
}
/**
* Sets the currently selected item.
*
* <p>The selection notification process is very much a hack. This fires
* a ListDataEvent where the range is between -1 and -1. This is identical
* to the notification process used by the {@link DefaultComboBoxModel}.
*/
public void setSelectedItem(Object selected) {
// if the selected item isn't actually changing values, avoid the work
if (this.selected == selected)
return;
this.selected = selected;
listDataEvent.setRange(-1, -1);
listDataEvent.setType(ListDataEvent.CONTENTS_CHANGED);
fireListDataEvent(listDataEvent);
}
}
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