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| 15. 33. 1. 监听组件事件， PropertyChangeListener |
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import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFrame;
class ActionChangedListener implements PropertyChangeListener {
private JButton button;
public ActionChangedListener(JButton button) {
this.button = button;
}
public void propertyChange(PropertyChangeEvent e) {
String propertyName = e.getPropertyName();
System.out.println(propertyName);
if (e.getPropertyName().equals(Action.NAME)) {
String text = (String) e.getNewValue();
button.setText(text);
button.repaint();
} else if (propertyName.equals("enabled")) {
Boolean enabledState = (Boolean) e.getNewValue();
button.setEnabled(enabledState.booleanValue());
button.repaint();
} else if (e.getPropertyName().equals(Action.SMALL_ICON)) {
Icon icon = (Icon) e.getNewValue();
button.setIcon(icon);
button.invalidate();
button.repaint();
}
}
}
public class PropertyListenerJComponent {
public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton bn = new JButton();
bn.addPropertyChangeListener(new ActionChangedListener(bn));
frame.add(bn);
bn.setEnabled(false);
frame.setSize(300, 300);
frame.setVisible(true);
frame.add(bn);
}
}
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| 15. 33. 属性变化事件监听 | | 15. 33. 1. | 监听组件事件， PropertyChangeListener | | |
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