okcanceldialog.java

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/*
 * Copyright (c) 1998-2002 Carnegie Mellon University.  All rights
 * reserved.
 *
 * 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 CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
 * ANY EXPRESSED 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 CARNEGIE MELLON UNIVERSITY
 * NOR ITS EMPLOYEES 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.
 *
 */

package rcm.awt;

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

public class OkCancelDialog extends Dialog {
    
    Panel controlsPane;
    Button okButton;
    Button cancelButton;

    public OkCancelDialog (Frame owner, String title) {
        super (owner, title, true);
        
        add (controlsPane = new Panel (), BorderLayout.CENTER);
        
        Panel panel;
        add (panel = new Panel (), BorderLayout.SOUTH);
        panel.setLayout (new FlowLayout ());
        
        Panel subpanel;
        panel.add (subpanel = new Panel ());
        subpanel.setLayout (new GridLayout (1, 0, 4, 0));

        subpanel.add (okButton = new Button ("OK"));
        okButton.addActionListener (new ActionListener () {
            public void actionPerformed (ActionEvent event) {
                ok ();
            }
        });
        
        subpanel.add (cancelButton = new Button ("Cancel"));
        cancelButton.addActionListener (new ActionListener () {
            public void actionPerformed (ActionEvent event) {
                cancel ();
            }
        });
        
        addWindowListener (new WindowAdapter () {
            public void windowClosing (WindowEvent event) {
                cancel ();
            }
        });
        
    }

    public static void centerWindow (Window window, Component ref) {
        Dimension size = window.getSize();
        Dimension refSize = (ref != null) ? ref.getSize() : Toolkit.getDefaultToolkit().getScreenSize();
        Point origin = (ref != null) ? ref.getLocationOnScreen () : new Point (0, 0);
        
        if (refSize != null) {
            int x = Math.max (0, origin.x + (refSize.width - size.width) / 2);
            int y = Math.max (0, origin.y + (refSize.height - size.height) / 2);
            window.setLocation (x, y);
        }
    }
    
    public void show () {
        Container parent = getParent ();
        if (parent != null)
            centerWindow (this, parent);
            
        registerKeystrokes ();

        super.show ();
    }
    
    public Panel getControlsPane () {
        return controlsPane;
    }

    public void registerKeystrokes () {
        // NIY: bind Enter to OK, Esc to Cancel
    }

    public void ok () {
        dispose ();
    }
    
    public void cancel () {
        dispose ();            
    }
}