Simple Save Dialog demo
/*
* 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.*;
import java.awt.event.*;
import javax.swing.*;
/*
* Simple Save Dialog demo.
* @version $Id: SaveDialog.java,v 1.4 2000/11/25 17:54:19 ian Exp $
*/
public class SaveDialog extends JFrame {
boolean unsavedChanges = false;
Button quitButton;
/** "main program" method - construct and show */
public static void main(String[] av) {
// create a SaveDialog object, tell it to show up
new SaveDialog().setVisible(true);
}
/** Construct the object including its GUI */
public SaveDialog() {
super("SaveDialog");
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
cp.add(new Label("Press this button to see the Quit dialog: "));
cp.add(quitButton = new Button("Quit"));
quitButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("In Exit Button's action handler");
if (okToQuit()) {
setVisible(false);
dispose();
System.exit(0);
}
}
});
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
setVisible(false);
dispose();
System.exit(0);
}
});
pack();
}
boolean okToQuit() {
String[] choices = {
"Yes, Save and Quit", "No, Quit without saving", "CANCEL"
};
int result = JOptionPane.showOptionDialog(this,
"You have unsaved changes. Save before quitting?", "Warning",
JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE,
null, choices, choices[0]);
// Use of "null" as the Icon argument is contentious... the
// document says you can pass null, but it does seem to
// generate a lot of blather if you do, something about
// a NullPointerException :-) ...
if (result >= 0)
System.out.println("You clicked " + choices[result]);
switch(result) {
case -1:
System.out.println("You killed my die-alog - it died");
return false;
case 0: // save and quit
System.out.println("Saving...");
// mainApp.doSave();
return true;
case 1: // just quit
return true;
case 2: // cancel
return false;
default:
throw new IllegalArgumentException("Unexpected return " + result);
}
}
}
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