How to cancel form closing using WindowAdapter ?

[Setya]

Hi all,
I've just started my first Java application. In my app, I inherits JFrame.
When the user close the form with close button, I want to show a Yes/No dialog
to give user a chance to cancel the form closing, but I can not find any
methods/properties in the event object passed to the WindowClosing method
that I can use to cancel the form closing.

Any advice would be greatly appreciated.

Thanks in advance


Setya

[Kent]

Hi,

Just use a WindowListener as such:

private static class MyWindowListener extends WindowAdapter {
public void windowClosing(WindowEvent e) {
boolean closeWindow = false; //get user input into this boolean

if (closeWindow) {
//now close the window - System.exit(0) etc.
}
}
}


Add this listener to your window with this in the constructor code:

this.addWindowListener(new MyWindowListener());

Regards,
Kent


"Setya" <jsetya@yahoo.com> wrote:
>
>Hi all,
> I've just started my first Java application. In my app, I inherits JFrame.
>When the user close the form with close button, I want to show a Yes/No
dialog
>to give user a chance to cancel the form closing, but I can not find any
>methods/properties in the event object passed to the WindowClosing method
>that I can use to cancel the form closing.
>
>Any advice would be greatly appreciated.
>
>Thanks in advance
>
>
>Setya

[Setya]

"Kent" <kb@essential.com.au> wrote:
>
>Hi,
>
>Just use a WindowListener as such:
>
>private static class MyWindowListener extends WindowAdapter {
> public void windowClosing(WindowEvent e) {
> boolean closeWindow = false; //get user input into this boolean
>
> if (closeWindow) {
> //now close the window - System.exit(0) etc.
> }
> }
>}
>
>
>Add this listener to your window with this in the constructor code:
>
>this.addWindowListener(new MyWindowListener());
>
>Regards,
>Kent
>
>
>"Setya" <jsetya@yahoo.com> wrote:
>>
>>Hi all,
>> I've just started my first Java application. In my app, I inherits JFrame.
>>When the user close the form with close button, I want to show a Yes/No
>dialog
>>to give user a chance to cancel the form closing, but I can not find any
>>methods/properties in the event object passed to the WindowClosing method
>>that I can use to cancel the form closing.
>>
>>Any advice would be greatly appreciated.
>>
>>Thanks in advance
>>
>>
>>Setya
>
Thanks Mr. Kent,

I write my code similiar to what you suggest above and I show a Yes/No dialog
:

int iSelect;
iSelect=JOptionPane.showOptionDialog(null,"Are you sure you want to exit
this application ?","Exit Application",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE);

if (iSelect==JOptionPane.YES_OPTION)
{
System.exit(0);
}

But when I click then NO button, the form keep closing anyway.

I use Forte For Java as my IDE, does it make a difference ?

Setya

[Kent]

Setya,

Sorry, I forgot to mention you need to add this code in your constructor
for the window class:

this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);

This will stop the window from closing and but will still let your window
listener code to run and close the window where appropriate.

Regards,
Kent


"Setya" <jsetya@yahoo.com> wrote:
>
>"Kent" <kb@essential.com.au> wrote:
>>
>>Hi,
>>
>>Just use a WindowListener as such:
>>
>>private static class MyWindowListener extends WindowAdapter {
>> public void windowClosing(WindowEvent e) {
>> boolean closeWindow = false; //get user input into this boolean
>>
>> if (closeWindow) {
>> //now close the window - System.exit(0) etc.
>> }
>> }
>>}
>>
>>
>>Add this listener to your window with this in the constructor code:
>>
>>this.addWindowListener(new MyWindowListener());
>>
>>Regards,
>>Kent
>>
>>
>>"Setya" <jsetya@yahoo.com> wrote:
>>>
>>>Hi all,
>>> I've just started my first Java application. In my app, I inherits
JFrame.
>>>When the user close the form with close button, I want to show a Yes/No
>>dialog
>>>to give user a chance to cancel the form closing, but I can not find any
>>>methods/properties in the event object passed to the WindowClosing method
>>>that I can use to cancel the form closing.
>>>
>>>Any advice would be greatly appreciated.
>>>
>>>Thanks in advance
>>>
>>>
>>>Setya
>>
>Thanks Mr. Kent,
>
>I write my code similiar to what you suggest above and I show a Yes/No dialog
>:
>
>int iSelect;
>iSelect=JOptionPane.showOptionDialog(null,"Are you sure you want to exit
>this application ?","Exit Application",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE);
>
>if (iSelect==JOptionPane.YES_OPTION)
> {
> System.exit(0);
> }
>
>But when I click then NO button, the form keep closing anyway.
>
>I use Forte For Java as my IDE, does it make a difference ?
>
>Setya
>

[Setya]

"Kent" <kb@essential.com.au> wrote:
>
>Setya,
>
>Sorry, I forgot to mention you need to add this code in your constructor
>for the window class:
>
>this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
>
>This will stop the window from closing and but will still let your window
>listener code to run and close the window where appropriate.
>
>Regards,
>Kent
>
>
>"Setya" <jsetya@yahoo.com> wrote:
>>
>>"Kent" <kb@essential.com.au> wrote:
>>>
>>>Hi,
>>>
>>>Just use a WindowListener as such:
>>>
>>>private static class MyWindowListener extends WindowAdapter {
>>> public void windowClosing(WindowEvent e) {
>>> boolean closeWindow = false; //get user input into this boolean
>>>
>>> if (closeWindow) {
>>> //now close the window - System.exit(0) etc.
>>> }
>>> }
>>>}
>>>
>>>
>>>Add this listener to your window with this in the constructor code:
>>>
>>>this.addWindowListener(new MyWindowListener());
>>>
>>>Regards,
>>>Kent
>>>
>>>
>>>"Setya" <jsetya@yahoo.com> wrote:
>>>>
>>>>Hi all,
>>>> I've just started my first Java application. In my app, I inherits
>JFrame.
>>>>When the user close the form with close button, I want to show a Yes/No
>>>dialog
>>>>to give user a chance to cancel the form closing, but I can not find
any
>>>>methods/properties in the event object passed to the WindowClosing method
>>>>that I can use to cancel the form closing.
>>>>
>>>>Any advice would be greatly appreciated.
>>>>
>>>>Thanks in advance
>>>>
>>>>
>>>>Setya
>>>
>>Thanks Mr. Kent,
>>
>>I write my code similiar to what you suggest above and I show a Yes/No
dialog
>>:
>>
>>int iSelect;
>>iSelect=JOptionPane.showOptionDialog(null,"Are you sure you want to exit
>>this application ?","Exit Application",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE);
>>
>>if (iSelect==JOptionPane.YES_OPTION)
>> {
>> System.exit(0);
>> }
>>
>>But when I click then NO button, the form keep closing anyway.
>>
>>I use Forte For Java as my IDE, does it make a difference ?
>>
>>Setya
>>
>
Mr. Kent,

So this is why the form keeps closing even if I choose NO.

My previous code was :

this.setDefaultCloseOperation(WindowConstants.CLOSE_ON_EXIT);


Thanks for your help.


Setya

[Volker Held]

Hi,

This should solve the problem, though it´s not a good app - the most
important part for you is the inner class implementing
the ActionListener interface. There you buttons action will be handled
correctly - this of course works only for one button since
i do not check the buttons action command.

Hope it helps you out....

Volker Held

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ConfirmClose extends JFrame{
public static void main( String[] args){ new ConfirmClose(); }

public ConfirmClose(){
super("WindowListening");

setSize(200,200);
setLocation(200,200);

JButton jb = new JButton("Close");
jb.addActionListener(new NewActionAdapter());

getContentPane().add(jb);

setVisible(true);

pack();
}

class NewActionAdapter implements ActionListener{
public void actionPerformed( ActionEvent ae ){
if ( JOptionPane.OK_OPTION ==
JOptionPane.showConfirmDialog(null, "You are sure you wanna quit?"
, "Closing application", JOptionPane.OK_CANCEL_OPTION))
System.exit(0);
}
}
}
"Setya" <jsetya@yahoo.com> wrote in message news:3cb67481@10.1.10.29...
>
> "Kent" <kb@essential.com.au> wrote:
> >
> >Setya,
> >
> >Sorry, I forgot to mention you need to add this code in your constructor
> >for the window class:
> >
> >this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
> >
> >This will stop the window from closing and but will still let your window
> >listener code to run and close the window where appropriate.
> >
> >Regards,
> >Kent
> >
> >
> >"Setya" <jsetya@yahoo.com> wrote:
> >>
> >>"Kent" <kb@essential.com.au> wrote:
> >>>
> >>>Hi,
> >>>
> >>>Just use a WindowListener as such:
> >>>
> >>>private static class MyWindowListener extends WindowAdapter {
> >>> public void windowClosing(WindowEvent e) {
> >>> boolean closeWindow = false; file://get user input into this
boolean
> >>>
> >>> if (closeWindow) {
> >>> file://now close the window - System.exit(0) etc.
> >>> }
> >>> }
> >>>}
> >>>
> >>>
> >>>Add this listener to your window with this in the constructor code:
> >>>
> >>>this.addWindowListener(new MyWindowListener());
> >>>
> >>>Regards,
> >>>Kent
> >>>
> >>>
> >>>"Setya" <jsetya@yahoo.com> wrote:
> >>>>
> >>>>Hi all,
> >>>> I've just started my first Java application. In my app, I inherits
> >JFrame.
> >>>>When the user close the form with close button, I want to show a
Yes/No
> >>>dialog
> >>>>to give user a chance to cancel the form closing, but I can not find
> any
> >>>>methods/properties in the event object passed to the WindowClosing
method
> >>>>that I can use to cancel the form closing.
> >>>>
> >>>>Any advice would be greatly appreciated.
> >>>>
> >>>>Thanks in advance
> >>>>
> >>>>
> >>>>Setya
> >>>
> >>Thanks Mr. Kent,
> >>
> >>I write my code similiar to what you suggest above and I show a Yes/No
> dialog
> >>:
> >>
> >>int iSelect;
> >>iSelect=JOptionPane.showOptionDialog(null,"Are you sure you want to exit
> >>this application ?","Exit
Application",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE);
> >>
> >>if (iSelect==JOptionPane.YES_OPTION)
> >> {
> >> System.exit(0);
> >> }
> >>
> >>But when I click then NO button, the form keep closing anyway.
> >>
> >>I use Forte For Java as my IDE, does it make a difference ?
> >>
> >>Setya
> >>
> >
> Mr. Kent,
>
> So this is why the form keeps closing even if I choose NO.
>
> My previous code was :
>
> this.setDefaultCloseOperation(WindowConstants.CLOSE_ON_EXIT);
>
>
> Thanks for your help.
>
>
> Setya