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/*******************************************************************************
* Copyright (c) 2007, 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal.model.value.swing;
import javax.swing.ComboBoxModel;
import org.eclipse.jpt.utility.internal.StringTools;
import org.eclipse.jpt.utility.internal.model.listener.awt.AWTPropertyChangeListenerWrapper;
import org.eclipse.jpt.utility.model.event.PropertyChangeEvent;
import org.eclipse.jpt.utility.model.listener.PropertyChangeListener;
import org.eclipse.jpt.utility.model.value.CollectionValueModel;
import org.eclipse.jpt.utility.model.value.ListValueModel;
import org.eclipse.jpt.utility.model.value.PropertyValueModel;
import org.eclipse.jpt.utility.model.value.WritablePropertyValueModel;
/**
* This javax.swing.ComboBoxModel can be used to keep a ListDataListener
* (e.g. a JComboBox) in synch with a ListValueModel (or a CollectionValueModel).
* For combo boxes, the model object that holds the current selection is
* typically a different model object than the one that holds the collection
* of choices.
*
* For example, a MWReference (the selectionOwner) has an attribute
* "sourceTable" (the collectionOwner)
* which holds on to a collection of MWDatabaseFields. When the selection
* is changed this model will keep the listeners aware of the changes.
* The inherited list model will keep its listeners aware of changes to the
* collection model
*
* In addition to the collection holder required by the superclass,
* an instance of this ComboBoxModel must be supplied with a
* selection holder, which is a PropertyValueModel that provides access
* to the selection (typically a PropertyAspectAdapter).
*/
public class ComboBoxModelAdapter
extends ListModelAdapter
implements ComboBoxModel
{
protected final WritablePropertyValueModel<Object> selectionHolder;
protected final PropertyChangeListener selectionListener;
// ********** constructors **********
/**
* Constructor - the list holder and selection holder are required;
*/
public ComboBoxModelAdapter(ListValueModel<?> listHolder, WritablePropertyValueModel<Object> selectionHolder) {
super(listHolder);
if (selectionHolder == null) {
throw new NullPointerException();
}
this.selectionHolder = selectionHolder;
this.selectionListener = this.buildSelectionListener();
}
/**
* Constructor - the collection holder and selection holder are required;
*/
public ComboBoxModelAdapter(CollectionValueModel<?> collectionHolder, WritablePropertyValueModel<Object> selectionHolder) {
super(collectionHolder);
if (selectionHolder == null) {
throw new NullPointerException();
}
this.selectionHolder = selectionHolder;
this.selectionListener = this.buildSelectionListener();
}
// ********** initialization **********
protected PropertyChangeListener buildSelectionListener() {
return new AWTPropertyChangeListenerWrapper(this.buildSelectionListener_());
}
protected PropertyChangeListener buildSelectionListener_() {
return new PropertyChangeListener() {
public void propertyChanged(PropertyChangeEvent event) {
// notify listeners that the selection has changed
ComboBoxModelAdapter.this.fireSelectionChanged();
}
@Override
public String toString() {
return "selection listener";
}
};
}
// ********** ComboBoxModel implementation **********
public Object getSelectedItem() {
return this.selectionHolder.getValue();
}
public void setSelectedItem(Object selectedItem) {
this.selectionHolder.setValue(selectedItem);
}
// ********** behavior **********
/**
* Extend to engage the selection holder.
*/
@Override
protected void engageModel() {
super.engageModel();
this.selectionHolder.addPropertyChangeListener(PropertyValueModel.VALUE, this.selectionListener);
}
/**
* Extend to disengage the selection holder.
*/
@Override
protected void disengageModel() {
this.selectionHolder.removePropertyChangeListener(PropertyValueModel.VALUE, this.selectionListener);
super.disengageModel();
}
/**
* Notify the listeners that the selection has changed.
*/
protected void fireSelectionChanged() {
// I guess this will work...
this.fireContentsChanged(this, -1, -1);
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.selectionHolder + ":" + this.listHolder);
}
}
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