Re: [AD] Removing the default close button support

[Eric Botcazou <ebotcazou@xxxxxxxxxx>]

> I was thinking that the close hook is not only for the close button,
> e.g. it should be called for Alt-F4 under Windows, so whether the close
> button is clickable is orthogonal to whether the close hook is set.

I agree that the callback should handle all forms of close button. But what 
would you let the user click the close button for, if he hasn't registered 
any callback ?

My proposition implicitly assumes that the close button will be physically 
disabled if no callback was previously registered.

> That's interesting.  In that case, maybe the user should be allowed to
> customise the message?

int set_close_button_callback(void (*proc)(void), const char *msg);
On platforms that have a close button, this routine installs a callback 
function to handle the close event. In other words, when the user clicks the 
close button on your program's window, the function you specify here will be 
called. If msg is not NULL, a dialog box displaying it will appear so as to 
let the user confirm his action; if he doesn't, the callback function will 
not be called. You can pass DEFAULT_MSG to display the default 
internationalized message.

-- 
Eric Botcazou