SWT: How to prevent window from closing when clicking "X"?

[Ivan Jouikov]

Hi!

Basically, I want to implement the following functionality:

When the user wants to close the window by clicking X button, I wish to popup a message saying "do you wish to save your crap, YES | NO | CANCEL". I did this by adding a disposeListener on the shell...

Now I am trying to figure out how to prevent disposal of the shell in case the user clicks "CANCEL"... Any ideas?

[Nick Kocher]

hi Ivan,

What is a disposeListener?

alternatively you could add a windowListener and then in windoClosing() show the popup dialog and check what the user clicks
if YES
//do something and then
dispose() your program or System.exit(0);

if NO
call dispose() on your program;

if CANCEL
dispose() your dialog
//and do nothing

I don't know may be there is a better way to solve your problem

[Ivan Jouikov]

Thanks for the clue, but I need more information...

Do I add the windowListener to my main shell?

And what's the windowClosing() method? Is it one of Shell's methods? As far as i know Shell can't be overriden, so where is it then?

I'll play around with it later today, just thought I'd ask you up front

[Ernest Friedman-Hill]

Nick seems to have missed the fact that this is an SWT question, not a Swing question. I think Ivan, you can safely ignore his post.

Anyway, this is a good question, Ivan, and I wish I knew the answer. I think I'd try to figure it out by looking at the JFace "ApplicationWindow" class.

[Ivan Jouikov]

What if I'm not using JFace? My App was built on pure SWT, so if is there a simple way to wrap main components (such as the Shell) into JFace?

[Ernest Friedman-Hill]

I was suggesting that you browse the source starting with the ApplicationWindow class.

Anyway, I just has a look around the source for Shell, and it looks as though you can do at least one of two things:

1) Subclass shell and override Shell.close(). In your override, you could post the dialog box, and if you want to really exit, call super.close(); otherwise, don't.

2) Don't subclass Shell, but instead add a ShellListener to the Shell which handles SWT.Close events by setting the Event.doIt field to "false".

I'd try the second one, and if it doesn't work, try the first one.

[Ivan Jouikov]

The second option worked, thanks for your help.

The biggest problem that I have is that I don't know where the hell SWT javadoc is... There is

http://www.eclipse.org/documentation/html/plugins/org.eclipse.platform.doc.isv/doc/reference/api/

But it's old, VERY old.

Do you know where i can find a current one?

[Ernest Friedman-Hill]

Well, inside of Eclipse, you can pick Help | Help Contents, and then in the help viewer open "Platform Plug-in Developer Guide", then Reference, then API Reference, and you've got the whole org.eclipse Javadoc tree. I'm sure there's a separate download somewhere, but I can't tell you where off the top of my head.

But I actually rarely look at it -- I tend to just look at the platform source.