On Jun 15, 2011, at 08:56, Luc Van Bogaert wrote:
> I'm not sure I understand how to accomplish this. What I have already tried,
> is message the window with "makeFirstResponder:" passing my view controllers
> as a parameter. This initially seemed to work fine; until I add an extra view
> with some textfields to the content pane. Now, it appears that my validation
> method does not get called anymore, leading me to the conclusion that somehow
> my view controllers are no longer part of the responder chain.
>
> I used NSLog to find out the kind of object that is my window's "first
> responder" and "next responder"; but the last method returns nil, which I
> don't understand.
I think there's still a small confusion here. For each window, there's a tree
structure of NSResponder objects with the window at the root and the views as
intermediate and leaf nodes. The nodes of this tree are linked
(uni-directionally) by the "nextResponder" property.
A responder chain is something a bit more complicated. It's a traversal of a
chain of objects beginning with a NSView, following the "nextResponder" links
to the window, then continuing with a succession of objects (window controller,
document, application, etc) that depends on which kind of responder chain
(mouse, keyboard, action, etc) is being traversed.
Creating a view controller does *not* link it into the window's tree of
responders, and therefore the view controller is not part of the responder
chain. The "no longer" in your comment above doesn't apply: it was never in the
chain.
In your scenario, where the view controller is playing little brother to the
window controller -- is implementing and validating action methods -- it needs
to be inserted manually into the tree of responders so that it *will* appear in
the responder chain.
For example, you can do it in the 'loadView' override of a NSViewController
subclass:
> - (void) loadView
> {
> [super loadView];
>
> // Insert this view controller into the responder chain
>
> NSResponder* nextResponder = self.view.nextResponder;
> self.view.nextResponder = self;
> self.nextResponder = nextResponder;
>
> }
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