[Openmcl-devel] Subclassing NSWindow, receiving events
gb at clozure.com
Fri Dec 19 16:16:07 EST 2003
On Fri, 19 Dec 2003, Duncan Rose wrote:
> I'm not sure what's wrong with the following (but obviously something
> is!). I'm playing with programmatically created windows and events in
> Cocoa from Lisp. Here's a copy of my listener session:
> Welcome to OpenMCL Version (Alpha: Darwin) 0.14-031108!
> ? (ccl::def-objc-class newlisp-window ns-window)
> #<A Mac Pointer #xF01C60>
> ? (ccl::define-objc-method ((:void :send-event e) newlisp-window)
> (format t "** SEND-EVENT ~S~%" e))
> ;Compiler warnings :
> ; Undeclared free variable CCL::SELF, in |-[NewlispWindow
> ; Unused lexical variable SELF, in |-[NewlispWindow sendEvent:]|.
> |-[NewlispWindow sendEvent:]|
> ? (setf window (ccl::make-objc-instance 'newlisp-window))
> #<A Mac Pointer #xF04070>
> ? (ccl::send window :order-front nil)
> ;Compiler warnings :
> ; Undeclared free variable WINDOW, in an anonymous lambda form.
> When I click on the window that appears, or move it around my terminal
> window (from which I started openmcl, and then did (require "COCOA") in
> this case) fills with:
> 2003-12-19 11:36:53.322  Error in event loop: Unbound variable:
> 2003-12-19 11:36:53.365  Error in event loop: Unbound variable:
> 2003-12-19 11:36:53.387  Error in event loop: Unbound variable:
> 2003-12-19 11:36:53.405  Error in event loop: Unbound variable:
> 2003-12-19 11:36:53.420  Error in event loop: Unbound variable:
> 2003-12-19 11:36:53.449  Error in event loop: Unbound variable:
> 2003-12-19 11:36:53.494  Error in event loop: Unbound variable:
> 2003-12-19 11:36:53.549  Error in event loop: Unbound variable:
> which I guess is related to the compile warning from earlier.
> I note (from objc-support.lisp) the following:
> (define-objc-method ((:id :init-with-lisp-id (:unsigned lisp-id))
> (setq self (send-super :init-with-name #@"lisp exception"
> :reason #@"lisp exception"
> :user-info (%null-ptr)))
> (setq lispid lisp-id)
> Do I need to override one of the NSWindow init methods to set "self" up?
> Sorry if this is documented somewhere, I haven't found anything on it
> yet (the tiny.lisp example comes close, but I can't see what I'm doing
> differently from it at a fundamental level - obviously something).
Randall Beer found this problem earlier today, and the fix is now in
Every ObjC method receives at least two arguments: "SELF" is the
object that receives the message, and "_CMD" is the selector (message
name.) DEFINE-OBJC-METHOD and friends intern "SELF" and "_CMD" in
the current package and bind those local variables correctly, but
(because of a missing comma in a backquoted form) there's a later
reference to CCL::SELF in some code that tries to set up the context
that SEND-SUPER might need. Needless to say, that only works if the
current package is "CCL" when the method's defined; this suggests
that you may be the first person who's tried to use DEFINE-OBJC-METHOD
from outside of the CCL package ...
For those not in the mood to wrestle with CVS, the missing comma's
in line 1050 of apple-objc.lisp:
(rlet ((,super :objc_super
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