Action: setEnabled(boolean b) : Action « javax.swing « Java by API

1. Java by API
2. javax.swing
3. Action

Action: setEnabled(boolean b)

import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;

public class MainClass extends JFrame {

  public static final int MIN_NUMBER = 2;

  public static final int MAX_NUMBER = 13;

  private int currentNumber = MIN_NUMBER;

  private int favoriteNumber = 9;

  private JLabel numberLabel = new JLabel();

  private Action upAction = new UpAction();

  private Action downAction = new DownAction();

  private GotoFavoriteAction gotoFavoriteAction = new GotoFavoriteAction();

  private Action setFavoriteAction = new SetFavoriteAction();

  public class UpAction extends AbstractAction {
    public UpAction() {
      putValue(NAME, "Number Add");
      putValue(SMALL_ICON, new ImageIcon("images/up.gif"));
      putValue(SHORT_DESCRIPTION, "Increment the number");
      putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_A));
    }

    public void actionPerformed(ActionEvent ae) {
      setChannel(currentNumber + 1);
    }
  }

  public class DownAction extends AbstractAction {
    public DownAction() {
      putValue(NAME, "Number Down");
      putValue(SMALL_ICON, new ImageIcon("images/down.gif"));
      putValue(SHORT_DESCRIPTION, "Decrement the number");
      putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_D));
    }

    public void actionPerformed(ActionEvent ae) {
      setChannel(currentNumber - 1);
    }
  }

  public class GotoFavoriteAction extends AbstractAction {
    public GotoFavoriteAction() {
      putValue(SMALL_ICON, new ImageIcon("images/fav.gif"));
      putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_G));
      updateProperties();
    }

    public void updateProperties() {
      putValue(NAME, "Go to number " + favoriteNumber);
      putValue(SHORT_DESCRIPTION, "Change the number to " + favoriteNumber);
    }

    public void actionPerformed(ActionEvent ae) {
      setChannel(favoriteNumber);
    }
  }

  public class SetFavoriteAction extends AbstractAction {
    public SetFavoriteAction() {
      putValue(NAME, "Set 'Go to' number");
      putValue(SMALL_ICON, new ImageIcon("images/set.gif"));
      putValue(SHORT_DESCRIPTION, "Make current number the Favorite number");
      putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_S));
    }

    public void actionPerformed(ActionEvent ae) {
      favoriteNumber = currentNumber;
      gotoFavoriteAction.updateProperties();
      setEnabled(false);
      gotoFavoriteAction.setEnabled(false);
    }
  }

  public MainClass() {
    super();

    setChannel(currentNumber);

    numberLabel.setHorizontalAlignment(JLabel.CENTER);
    numberLabel.setFont(new Font("Serif", Font.PLAIN, 32));

    getContentPane().add(numberLabel, BorderLayout.NORTH);

    JPanel buttonPanel = new JPanel(new GridLayout(2, 2, 16, 6));
    buttonPanel.setBorder(BorderFactory.createEmptyBorder(6, 16, 16, 16));
    getContentPane().add(buttonPanel, BorderLayout.CENTER);
    buttonPanel.add(new JButton(upAction));
    buttonPanel.add(new JButton(gotoFavoriteAction));
    buttonPanel.add(new JButton(downAction));
    buttonPanel.add(new JButton(setFavoriteAction));

    JMenuBar mb = new JMenuBar();
    JMenu menu = new JMenu("Number");
    menu.add(new JMenuItem(upAction));
    menu.add(new JMenuItem(downAction));
    menu.addSeparator();
    menu.add(new JMenuItem(gotoFavoriteAction));
    menu.add(new JMenuItem(setFavoriteAction));
    mb.add(menu);
    setJMenuBar(mb);
  }

  public void setChannel(int chan) {
    currentNumber = chan;
    numberLabel.setText("Now tuned to number: " + currentNumber);
    downAction.setEnabled(currentNumber > MIN_NUMBER);
    upAction.setEnabled(currentNumber < MAX_NUMBER);
    gotoFavoriteAction.setEnabled(currentNumber != favoriteNumber);
    setFavoriteAction.setEnabled(currentNumber != favoriteNumber);
  }

  public static void main(String argv[]) {
    JFrame f = new MainClass();
    f.setSize(400, 180);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
  }
}

           
       

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