Re: Tutorials enhancement proposal : First Steps in GNUstep GUI Programming (2) : NSWindow, NSButton

[Patrick Cardona]

Hi Richard,

Thank You for this aknowledgment. I will keep it in my Templates 
Library.
I don't own the source of the Tutorial document, so only Nicola could 
modify it.

When You say :
> the initWithContentRect:... 
> method may destroy the original window...

Does it mean sometimes it does, sometimes it does not ? How this 
behaviour is predictable ?
Well, I understand I must continue to read, try and learn...

Regards,

--
Bien cordialement,
Patrick CARDONA
On 2020-06-10 12:04:11 +0200 Richard Frith-Macdonald 
<richard@frithmacdonald.me.uk> wrote:

> > On 10 Jun 2020, at 10:42, Patrick Cardona via Discussion list for 
> > the 
> > GNUstep programming environment <discuss-gnustep@gnu.org> wrote:
>
>
> > (2) In the method 'createWindow' :
>
> > - (void) createWindow
> > {
> > ...
> > myWindow = [NSWindow alloc];
>
> >   /* Don't make a assignment of 'myWindow' again...
> >   myWindow = */
> >   /* So I kept only the message... */
> >   [myWindow initWithContentRect: rect
> >                        styleMask: styleMask
> >                        backing: NSBackingStoreBuffered
> >                        defer: NO];
>
> The correct code here is
>
> myWindow = [NSWindow alloc];
> myWindow = [myWindow initWithContentRect: rect
>                       styleMask: styleMask
>                       backing: NSBackingStoreBuffered
>                       defer: NO];
>
> You *must* have the second assignment, because the 
> initWithContentRect:... 
> method may destroy the original window and return a new one.  maybe 
> it would 
> help for the tutorial to have a comment saying that.
>
> If you find it aesthetically displeasing to have two assignments, you 
> can 
> write the code as
>
> myWindow = [[NSWindow alloc] initWithContentRect: rect
>                       styleMask: styleMask
>                       backing: NSBackingStoreBuffered
>                       defer: NO];