Disable an Action : Action « Swing Event « Java Tutorial

1. Java Tutorial
2. Swing Event
3. Action

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;

public class ActionDisabled extends JFrame {
  public static final String ENABLE = "ENABLE";
  public static final String DISABLE = "DISABLE";

  private JToolBar toolBar = new JToolBar();
  private JMenuBar menuBar = new JMenuBar();
  private JMenu testMenu = new JMenu("Test");
  private MyAction theAction = new MyAction(this);
  private JMenuItem disableActionItem= new JMenuItem("Disable the Action");

  public ActionDisabled() {
    this.setJMenuBar(menuBar);
    menuBar.add(testMenu);

    testMenu.add(theAction);
    toolBar.add(theAction);

    disableActionItem.setActionCommand(DISABLE);
    testMenu.add(disableActionItem);
    disableActionItem.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand().equals(DISABLE)) {
          theAction.setEnabled(false);
          disableActionItem.setText("Enable the Action");
          disableActionItem.setActionCommand(ENABLE);
        } else {
          theAction.setEnabled(true);
          disableActionItem.setText("Disable the Action");
          disableActionItem.setActionCommand(DISABLE);
        }
      }
    });
    this.getContentPane().add(toolBar, BorderLayout.NORTH);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.getContentPane().setBackground(Color.red);
    this.setSize(320, 200);
    this.setVisible(true);
  }

  public static void main(String[] args) {
    ActionDisabled t = new ActionDisabled();
  }
}

class MyAction extends AbstractAction {
  JFrame f;
  boolean toggle = true;

  public MyAction(JFrame f) {
    super("Change Color");
    this.f = f;
  }

  public void actionPerformed(ActionEvent e) {
    if (toggle) {
      f.getContentPane().setBackground(Color.blue);
      toggle = false;
    } else {
      f.getContentPane().setBackground(Color.red);
      toggle = true;
    }
    f.repaint();
  }
}

15.3.Action
	15.3.1.	AbstractAction Lookup Property Keys
	15.3.2.	Creating an Action
	15.3.3.	Action Usage Example
	15.3.4.	extends AbstractAction
	15.3.5.	Disable an Action
	15.3.6.	Get and set Action Command
	15.3.7.	Register action
	15.3.8.	ActionMap javax.swing.JComponent.getActionMap()
	15.3.9.	Map actions with keystrokes
	15.3.10.	Enabling an Action
	15.3.11.	Listing the Actions in a Component