Observe notification from a static object?

[hatzinik]

Hi everybody,

i am trying to build a panel window. The panel is supposed to be opened from a document window.
And i use a static window controller object to open the panel.

I want the document window to be able to hear the NSWindowWillCloseNotification only send from the
static panel window controller. The code is shown below:

// Find the default notification center…
let center = NSNotificationCenter.defaultCenter()

    find the static panel window controller object
    let p = PanelWindowController.sharedPanelWindowController()
    
    // Make document observe the notification:
    // when the panel is about to close...
    center.addObserver(self,
        selector: Selector("panelWillCloseNotification:"),
        name: NSWindowWillCloseNotification,
        object: p)

When the app runs, the document cannot hear the notification.
If no object is passed (instead of p, i use nil) the document hears
the notification, but at the same time it hears NSWindowWillCloseNotification
from other documents also. A behavior i do not want.

Is the static object the problem?

[hatzinik]

I found where my error was.

NSWindowWillClose notification is a NSWindow notification and not
a NSWindowController notification.

So, static object can be added as notification senders.

So the observer must be added like that (change in bold):

// Find the default notification center…
let center = NSNotificationCenter.defaultCenter()

find the static panel window controller object
let p = PanelWindowController.sharedPanelWindowController()

// Make document observe the notification:
// when the panel is about to close…
center.addObserver(self,
selector: Selector(“panelWillCloseNotification:”),
name: NSWindowWillCloseNotification,
object: p.window)