Save on exit

[raphfrk]

When a user clicks X on the window to exit, how do I set it up so that
a function is executed before the window exits ? Basically, this is to
give the user a "file not saved" warning before exiting.

 

[Andrew T.]

When a user clicks X on the window to exit, how do I set it up so that
a function is executed before the window exits ?

See
<file:///F:/docs/api/java/lang/Runtime.html#addShutdownHook(java.lang.Thread)>

HTH

Andrew T.

 

[Moiristo]

When a user clicks X on the window to exit, how do I set it up so that
a function is executed before the window exits ? Basically, this is to
give the user a "file not saved" warning before exiting.

Create a WindowListener

 

[Andrew T.]

See
<file:///F:/docs/api/java/lang/Runtime.html#addShutdownHook(java.lang.Thread)>

Or.. (polite cough) if you don't happen to be at my place, you might
try..
<http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Runtime.html#addShutdownHook(java.lang.Thread)>

Andrew T.

 

[Oliver Wong]

When a user clicks X on the window to exit, how do I set it up so that
a function is executed before the window exits ? Basically, this is to
give the user a "file not saved" warning before exiting.

Use a Window Listener to listen for the WindowClosing or WindowClosed
event:
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/event/WindowListener.html

- Oliver

 

[Andrew T.]

Uggh.. it was only after reading the replies of moiristo and Oliver
that I realised I had misunderstood your question.

Andrew T.

 

[Steve W. Jackson]

When a user clicks X on the window to exit, how do I set it up so that
a function is executed before the window exits ? Basically, this is to
give the user a "file not saved" warning before exiting.

First, call this:

myFrame.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);

Then add a WindowListener to your frame and implement its windowClosed
method. In that method is where you see if you need to save and respond
appropriately.

FWIW, you should probably go through the Swing tutorial Sun offers,
since it covers relatively common topics like this. And you may also
want to find the comp.lang.java.gui group, which is a better place to
post GUI-related queries.

= Steve =

 

[raphfrk]

First, call this:

myFrame.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);

Thanks, I just wanted to prevent people from closing without having to
save. Now, the menu "quit" option must be used to exit and I can put
the options on that.

 

[Steve W. Jackson]

Thanks, I just wanted to prevent people from closing without having to
save. Now, the menu "quit" option must be used to exit and I can put
the options on that.

A well-behaved (make that "friendlier") application would still have a
listener that would simply invoke the "quit" item you refer to, so that
its action gets to the same code.