JButton: removeActionListener(ActionListener l) : JButton « javax.swing « Java by API

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

JButton: removeActionListener(ActionListener l)

  
/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * Demo to show a way of having "More Choices/Less Choices" in a pop-up window.
 * The secret is to call pack() again each time you add/subtract the bottom
 * panel.
 * 
 * @author Ian F. Darwin, http://www.darwinsys.com/
 * @version $Id: MoreChoices.java,v 1.3 2004/02/09 03:33:50 ian Exp $
 */
public class Main extends JFrame {
  Container cp;

  boolean unsavedChanges = false;

  JButton moreOrLessButton;

  JPanel moreOrLessPanel;

  ActionListener more;

  ActionListener less;

  /** "main program" method - construct and show */
  public static void main(String[] av) {
    // create a MoreChoices object, tell it to show up
    JFrame jf = new Main();
    jf.setLocation(100, 100); // get away from screen corner,
    // since on some OSes a main window at 0,0 may be
    // partly obscured (e.g. notebook with PowerPanel
    jf.setVisible(true);
  }

  /** Construct the object including its GUI */
  public Main() {
    super("More Choices");
    // cp = getContentPane();
    cp = this;
    cp.setLayout(new BorderLayout());

    ButtonsPanel bp = new ButtonsPanel();
    cp.add(BorderLayout.NORTH, bp);

    // Construct the more/less switcher
    less = new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        cp.remove(moreOrLessPanel);
        pack();
        moreOrLessButton.setText("More Choices");
        moreOrLessButton.removeActionListener(less);
        moreOrLessButton.addActionListener(more);
      }
    };
    more = new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        cp.add(BorderLayout.SOUTH, moreOrLessPanel);
        pack();
        moreOrLessButton.setText("Fewer Choices");
        moreOrLessButton.removeActionListener(more);
        moreOrLessButton.addActionListener(less);
      }
    };
    bp.add(moreOrLessButton = new JButton("More Choices"));
    // Initial state is to add more choices
    moreOrLessButton.addActionListener(more);

    moreOrLessPanel = new ChoicesPanel();

    // Finally a frame closer
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        setVisible(false);
        dispose();
        System.exit(0);
      }
    });

    pack();
  }

  /**
   * The panel that appears when you press More Choices. This is a toy; in a
   * real application, this would likely be a separate full "public class".
   */
  class ChoicesPanel extends JPanel {
    ChoicesPanel() {
      setBorder(BorderFactory.createEtchedBorder());
      add(new JCheckBox("Happiness"));
      add(new JCheckBox("Satisfaction"));
      add(new JCheckBox("Contentment"));
    }
  }

  /**
   * The Panel that contains the More/Less button. It is just here to override
   * getPreferredSize so that we can avoid "jitter" (i.e., the width changing);
   * i.e., we must ensure that the main panel and the ChoicePanel have the same
   * width
   */
  class ButtonsPanel extends JPanel {
    public Dimension getPreferredSize() {
      // System.out.println("In ButtonsPanel.getPreferredSize()");
      // For height, use our normal height
      int dHeight = moreOrLessButton.getPreferredSize().height + 5 + 5;
      // For witdh, use the included Panel's width
      int dWidth = moreOrLessPanel.getPreferredSize().width;
      // Combine them; that's the result we need.
      return new Dimension(dWidth, dHeight);
    }
  }
}

   
    
  

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