001    /*
002     * Copyright 2002-2004 the original author or authors.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005     * use this file except in compliance with the License. You may obtain a copy of
006     * the License at
007     * 
008     * http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013     * License for the specific language governing permissions and limitations under
014     * the License.
015     */
016    package org.springframework.binding.value.swing;
017    
018    import javax.swing.JSpinner;
019    import javax.swing.event.ChangeEvent;
020    import javax.swing.event.ChangeListener;
021    
022    import org.springframework.binding.value.ValueModel;
023    import org.springframework.binding.value.support.AbstractValueModelAdapter;
024    
025    /**
026     * Adapts a value model to a JSpinner control.
027     * 
028     * @author Oliver Hutchison
029     */
030    public class SpinnerAdapter extends AbstractValueModelAdapter {
031        
032        private final SpinnerChangeListener listener = new SpinnerChangeListener();
033            
034        private final JSpinner spinner;
035    
036        public SpinnerAdapter(JSpinner spinner, ValueModel valueModel) {
037            super(valueModel);
038            this.spinner = spinner;
039            this.spinner.addChangeListener(listener);
040            initalizeAdaptedValue();
041        }
042    
043        protected void valueModelValueChanged(Object newValue) {
044            if (newValue == null) {
045                spinner.setValue(new Integer(0));
046            }
047            else {
048                spinner.setValue(newValue);
049            }
050        }
051        
052        private class SpinnerChangeListener implements ChangeListener {
053            public void stateChanged(ChangeEvent e) {
054                adaptedValueChanged(spinner.getValue());
055            }
056        }
057    }