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POPropertyChangeSupport for SpinnerNumberModel
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copied!<p>I want to listen to the changes of the value of the SpinnerNumberModel for a JSpinner.<br> I create a PropertyChangeSupport and put the model into it.</p> <p>I need the propertyChangeListener, because it shows me the old and new value of the property. </p> <p>The snippet doesn't work: the <code>propertyChange</code> method prints nothing, when I click on the JSpinner.<br> A simple ChangeListener give only the new value, but I need also the old value, how can I get it?</p> <pre><code>package de.unikassel.jung; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.beans.PropertyChangeSupport; import javax.swing.JFrame; import javax.swing.JSpinner; import javax.swing.SpinnerNumberModel; public class PropertyChangeTest implements PropertyChangeListener { public static void main(String[] args) { new PropertyChangeTest(); } public PropertyChangeTest() { JFrame frame = new JFrame(); frame.setBounds(100, 100, 450, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); int value = 1; int min = 0; int max = 10; int step = 1; SpinnerNumberModel spinnerModel = new SpinnerNumberModel(value, min, max, step); PropertyChangeSupport pcs = new PropertyChangeSupport(spinnerModel); pcs.addPropertyChangeListener("value", this); JSpinner spinner = new JSpinner(spinnerModel); frame.getContentPane().add(spinner); frame.setVisible(true); } @Override public void propertyChange(PropertyChangeEvent evt) { System.out.println(evt); System.out.println(evt.getSource()); } } </code></pre>

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