WITH-GVALUE now uses WITH-ALLOCATED-MEMORY

[clg] / glib / gcallback.lisp

diff --git a/glib/gcallback.lisp b/glib/gcallback.lisp
index a6bba969970284dc7114601b16e490f57ca66b4e..faab749b7fccc2af05f6593df0278397a958f38f 100644 (file)
--- a/glib/gcallback.lisp
+++ b/glib/gcallback.lisp
@@ -20,7 +20,7 @@
 ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-;; $Id: gcallback.lisp,v 1.25 2005/04/24 13:25:31 espen Exp $
+;; $Id: gcallback.lisp,v 1.29 2006/02/08 19:56:25 espen Exp $
 
 (in-package "GLIB")
 
@@ -58,10 +58,17 @@ (defun callback-trampoline (callback-id n-params param-values &optional
                        (gvalue-type return-value)))
         (args (loop
                for n from 0 below n-params
-               collect (gvalue-get (sap+ param-values (* n +gvalue-size+))))))
-    (let ((result (apply #'invoke-callback callback-id return-type args)))
-      (when return-type
-       (gvalue-set return-value result)))))
+               for offset from 0 by +gvalue-size+
+               collect (gvalue-get (sap+ param-values offset) t))))
+    (unwind-protect
+       (let ((result (apply #'invoke-callback callback-id return-type args)))
+         (when return-type
+           (gvalue-set return-value result)))
+      (loop 
+       for arg in args
+       when (typep arg 'proxy)
+       do (invalidate-instance arg)))))
+
 
 (defun invoke-callback (callback-id return-type &rest args)
   (restart-case
@@ -186,6 +193,78 @@ (defun describe-signal (signal-id &optional type)
 
 ;;;; Signal connecting and controlling
 
+(defvar *overridden-signals* (make-hash-table :test 'equalp))
+
+(defbinding %signal-override-class-closure () nil
+  (signal-id unsigned-int)
+  (type-number type-number)
+  (callback-closure pointer))
+
+
+(defun signal-override-class-closure (name type function)
+  (let* ((signal-id (ensure-signal-id-from-type name type))
+        (type-number (find-type-number type t))
+        (callback-id (gethash (cons type-number signal-id) *overridden-signals*)))
+    (if callback-id
+       (update-user-data callback-id function)
+      (multiple-value-bind (callback-closure callback-id)
+         (make-callback-closure function)
+       (%signal-override-class-closure signal-id type-number callback-closure)
+       (setf 
+        (gethash (cons type-number signal-id) *overridden-signals*)
+        callback-id)))))
+
+
+(defbinding %signal-chain-from-overridden () nil
+  (args pointer)
+  (return-value (or null gvalue)))
+
+
+(defun %call-next-handler (n-params types args return-type)
+  (let ((params (allocate-memory (* n-params +gvalue-size+))))
+    (loop 
+     for arg in args
+     for type in types
+     for offset from 0 by +gvalue-size+
+     do (gvalue-init (sap+ params offset) type arg))
+
+    (unwind-protect
+       (if return-type
+           (with-gvalue (return-value return-type)
+             (%signal-chain-from-overridden params return-value))
+         (%signal-chain-from-overridden params nil))
+      (progn
+       (loop
+        repeat n-params
+        for offset from 0 by +gvalue-size+
+        do (gvalue-unset (sap+ params offset)))
+       (deallocate-memory params)))))
+
+
+(defmacro define-signal-handler (name ((object class) &rest args) &body body)
+  (let* ((info (signal-query (ensure-signal-id-from-type name class)))
+        (types (cons class (signal-param-types info)))
+        (n-params (1+ (slot-value info 'n-params)))
+        (return-type (type-from-number (slot-value info 'return-type)))
+        (vars (loop
+               for arg in args
+               until (eq arg '&rest)
+               collect arg))
+        (rest (cadr (member '&rest args)))
+        (next (make-symbol "ARGS"))
+        (default (make-symbol "DEFAULT")))
+
+    `(progn
+       (signal-override-class-closure ',name ',class 
+       #'(lambda (,object ,@args)
+           (let ((,default (list* ,object ,@vars ,rest)))
+             (flet ((call-next-handler (&rest ,next)
+                      (%call-next-handler 
+                       ,n-params ',types (or ,next ,default) ',return-type))))
+             ,@body)))
+       ',name)))
+
+
 (defbinding %signal-stop-emission () nil
   (instance ginstance)
   (signal-id unsigned-int)