beginner question document based application

[Paul Forgey]

I've got a document based Cocoa application, and I would like to have
a single NSPanel which shows certain stuff about the current document.
I think that I want to create a conroller which has a class method
creating or returning a one and only instance of the panel's
controller which I can then inform of what the current document is.
But -- how I know when the current document changes?

[matt neuburg]

In <207eddbd.0309121718.348e75d5@posting.google.com > Paul Forgey wrote:

> I've got a document based Cocoa application, and I would like to have
> a single NSPanel which shows certain stuff about the current document.
> I think that I want to create a conroller which has a class method
> creating or returning a one and only instance of the panel's
> controller which I can then inform of what the current document is.
> But -- how I know when the current document changes?

Use a notification. Look at the notifications for a window. From a
window you can get its windowcontroller and document. m.

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[Paul Forgey]

matt neuburg <matt@tidbits.com> wrote in message news:<20030913092526765-0700@news.la.sbcglobal.net>...

> In <207eddbd.0309121718.348e75d5@posting.google.com > Paul Forgey wrote:

> > I've got a document based Cocoa application, and I would like to have
> > a single NSPanel which shows certain stuff about the current document.
> > I think that I want to create a conroller which has a class method
> > creating or returning a one and only instance of the panel's
> > controller which I can then inform of what the current document is.
> > But -- how I know when the current document changes?

>
> Use a notification. Look at the notifications for a window. From a
> window you can get its windowcontroller and document. m.

Forgot about that, thanks! Since I subclassed NSWindowController for
my document window, this was very easy to do. Just made my controller
delegate for the document window (rather than notifications, which I
guess I would do if I didn't subclass NSWindowController), and used
windowWillClose: and windowDidBecomeMain:. For the shared panel
controller then, I gave it methods document: and setDocument:. When
the document window becomes main, I call setDocument: on the panel,
and when the window closes, I call setDocument:nil ONLY if document:
returns my current document.