// Copyright 2011 Palantir Technologies
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.palantir.ptoss.cinch.swing;
import java.beans.IntrospectionException;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.List;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import com.google.common.collect.ImmutableList;
import com.palantir.ptoss.cinch.core.BindableModel;
import com.palantir.ptoss.cinch.core.Binding;
import com.palantir.ptoss.cinch.core.BindingContext;
import com.palantir.ptoss.cinch.core.ModelUpdate;
import com.palantir.ptoss.cinch.core.WiringHarness;
import com.palantir.ptoss.cinch.swing.Bound.Utilities;
import com.palantir.ptoss.cinch.swing.Bound.Wiring;
import com.palantir.ptoss.util.Mutator;
/**
* A {@link WiringHarness} for binding a {@link JComboBox} to a {@link List} value in a
* {@link BindableModel}.
*/
public class JComboBoxWiringHarness implements WiringHarness<Bound, Field> {
public Collection<Binding> wire(Bound bound, BindingContext context, Field field) throws IllegalAccessException, IntrospectionException {
String target = bound.to();
JComboBox combo = context.getFieldObject(field, JComboBox.class);
Mutator mutator = Mutator.create(context, target);
final String nullValue = (String)Utilities.getNullValue(context, bound.nullValue());
return ImmutableList.of(bindJComboBox(bound, mutator, combo, nullValue));
}
private Binding bindJComboBox(final Bound bound, final Mutator mutator, final JComboBox combo, final String nullValue) {
final List<Object> ons = BindingContext.getOnObjects(bound.on(), mutator.getModel());
Binding binding = new Binding() {
public <T extends Enum<?> & ModelUpdate> void update(T... changed) {
if (!BindingContext.isOn(ons, changed)) {
return;
}
try {
updateComboModel(combo, (List<?>)mutator.get(), nullValue);
} catch (Exception ex) {
Wiring.logger.error("exception in JList binding", ex);
}
}
};
mutator.getModel().bind(binding);
return binding;
}
private void updateComboModel(JComboBox combo, List<?> newContents, String nullValue) {
int selectedIndex = combo.getSelectedIndex();
Object selected = combo.getSelectedItem();
DefaultComboBoxModel comboModel = new DefaultComboBoxModel();
if (nullValue != null) {
comboModel.addElement(nullValue);
}
for (Object obj : newContents) {
comboModel.addElement(obj);
}
if (comboModel.getIndexOf(selected) != -1) {
comboModel.setSelectedItem(selected);
} else {
if (comboModel.getSize() > selectedIndex) {
comboModel.setSelectedItem(combo.getItemAt(selectedIndex));
} else if (comboModel.getSize() > 0) {
comboModel.setSelectedItem(combo.getItemAt(comboModel.getSize() - 1));
}
}
combo.setModel(comboModel);
}
}