Re: NSWindow's firstResponder and a pointer to that object.
Re: NSWindow's firstResponder and a pointer to that object.
- Subject: Re: NSWindow's firstResponder and a pointer to that object.
- From: Johan Kool <email@hidden>
- Date: Sat, 10 Jan 2004 01:44:32 +0100
On Jan 9, 2004, at 03:43, Dustin Voss wrote:
On 8 Jan, 2004, at 9:10 AM, Johan Kool wrote:
Hello,
I can't find this anywhere. I am implementing an inspector and are
listening for NSWindowDidBecomeMainNotification notifications. This
gets me the current window, so now I would be interested in which
object is the firstResponder. With [myWindow firstResponder] I get
back a NSResponder, but with that pointer I can't send function calls
to the firstResponder. I tried to send notifications from my view
when it loses the firstResponder state, but as every window has a
firstResponder, this only works when I have multiple views or when I
create a new window.
So my question is: How do I get a pointer to myView in myWindow
knowing that myView is the firstResponder and having a pointer to
myWindow?
Related to this: How do I test that a pointer is to an object of a
certain class?
This shouldn't be a problem. [myWindow firstResponder] returns a
pointer to an NSResponder. This does not mean that the object is an
NSResponder, and only an NSResponder. It just means that the object
can be treated as an NSResponder. The object will actually be an
NSView (or your sub-class of NSView). Specifically, it will be myView.
NSView inherits from NSResponder, so of course you can call
NSResponder selectors, but you can also call NSView selectors.
If you want to check to see if the object is of a certain class, use
the following code:
[object isKindOfClass:[ACertainClass class]]
This will return true if object is an instance of ACertainClass or of
a sub-class of ACertainClass. If you want to exclude sub-classes for
some reason, use isMemberOfClass: instead of isKindOfClass:.
Thanks for your clarification! I should have known this. Stupid me! :-)
I was looking to see if a window/view posts notifications about changes
in the firstResponder. Am I right there is no such thing unless I
implement it into my subclasses myself?
Johan
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