billboardcustomizer.java

jbshortcourse

package Marcel;

import java.awt.*;
import java.awt.event.*;
import java.beans.*;

public class BillboardCustomizer extends Panel 
    implements Customizer, ActionListener {
  private CentralPerk target;
  private TextField fontField, msgField;
  private PropertyChangeSupport support =
    new PropertyChangeSupport(this);
  public void setObject(Object obj) {
    target = (CentralPerk) obj;
    Label t1 = new Label("Font:");
    add(t1);
    fontField = new TextField(encode(target.getFont()), 20);
    add(fontField);
    fontField.addActionListener(this);
    Label t2 = new Label("Message:");
    add(t2);
    msgField = new TextField(target.getMessage(), 20);
    add(msgField);
    msgField.addActionListener(this);
  }
  public Dimension preferredSize() {
    return new Dimension(225, 60);
  }
  public void actionPerformed(ActionEvent e) {
    Object source = e.getSource();
    if (source==fontField) {
      String txt = fontField.getText();
      try {
        target.setFont (Font.decode (txt));
      } catch (NumberFormatException ex) {
        fontField.setText(encode(target.getFont()));
      }
      support.firePropertyChange("", null, null);
    }else if (source==msgField) {
      target.setMessage (msgField.getText());
      support.firePropertyChange("", null, null);
    }
  }
  public void addPropertyChangeListener(
      PropertyChangeListener l) {
    support.addPropertyChangeListener(l);
  }
  public void removePropertyChangeListener(
      PropertyChangeListener l) {
    support.removePropertyChangeListener(l);
  }
  private String encode (Font f) {
    String style;
    if (f.isBold())
      style = f.isItalic() ? "bolditalic" : "bold";
    else
      style = f.isItalic() ? "italic" : "plain";
    return f.getName() + "-" + style + "-" + f.getSize();
  }
}