X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/clg/blobdiff_plain/8755b1a5d37f2f4b853c01f0d8b121ab9ee4093a..aa9ceddc987ea92cb20b319ff7b1a51bc176b6e8:/glib/gcallback.lisp

diff --git a/glib/gcallback.lisp b/glib/gcallback.lisp
index e421227..ca406e9 100644
--- a/glib/gcallback.lisp
+++ b/glib/gcallback.lisp
@@ -15,7 +15,7 @@
 ;; License along with this library; if not, write to the Free Software
 ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
-;; $Id: gcallback.lisp,v 1.13 2004-11-07 01:23:38 espen Exp $
+;; $Id: gcallback.lisp,v 1.16 2004-12-05 13:54:10 espen Exp $
 
 (in-package "GLIB")
 
@@ -78,24 +78,38 @@ (defun invoke-callback (callback-id return-type &rest args)
 
 ;;;; Timeouts and idle functions
 
+(defconstant +priority-high+ -100)
+(defconstant +priority-default+ 0)
+(defconstant +priority-high-idle+ 100)
+(defconstant +priority-default-idle+ 200)
+(defconstant +priority-low+ 300)
+
+(defbinding source-remove () boolean
+  (tag unsigned-int))
+
 (defcallback source-callback-marshal (nil (callback-id unsigned-int))
   (callback-trampoline callback-id 0 nil (make-pointer 0)))
 
 (defbinding (timeout-add "g_timeout_add_full")
-    (function interval &optional (priority 0)) unsigned-int 
+    (interval function &optional (priority +priority-default+)) unsigned-int 
   (priority int)
   (interval unsigned-int)
-  (*source-callback-marshal* pointer)
+  ((callback source-callback-marshal) pointer)
   ((register-callback-function function) unsigned-long)
   ((callback %destroy-user-data) pointer))
 
+(defun timeout-remove (timeout)
+  (source-remove timeout))
+
 (defbinding (idle-add "g_idle_add_full")
-    (function &optional (priority 0)) unsigned-int 
+    (function &optional (priority +priority-default-idle+)) unsigned-int 
   (priority int)
-  (*source-callback-marshal* pointer)
+  ((callback source-callback-marshal) pointer)
   ((register-callback-function function) unsigned-long)
   ((callback %destroy-user-data) pointer))
 
+(defun idle-remove (idle)
+  (source-remove idle))
 
 
 ;;;; Signals
@@ -159,16 +173,17 @@ (defmethod signal-connect ((gobject gobject) signal function &key after object)
  is T, the object connected to is passed as the first argument to the callback 
  function, or if :OBJECT is any other non NIL value, it is passed as the first 
  argument instead. If :AFTER is non NIL, the handler will be called after the 
- default handler of the signal."
-  (let ((callback-id
-	 (make-callback-closure
-	  (cond
-	   ((or (eq object t) (eq object gobject)) function)
-	   ((not object)
-	    #'(lambda (&rest args) (apply function (cdr args))))
-	   (t
-	    #'(lambda (&rest args) (apply function object (rest args))))))))
-    (signal-connect-closure gobject signal callback-id :after after)))
+ default handler for the signal."
+  (when function
+    (let ((callback-id
+	   (make-callback-closure
+	    (cond
+	      ((or (eq object t) (eq object gobject)) function)
+	      ((not object)
+	       #'(lambda (&rest args) (apply function (cdr args))))
+	      (t
+	       #'(lambda (&rest args) (apply function object (rest args))))))))
+      (signal-connect-closure gobject signal callback-id :after after))))
 
 
 ;;; Message logging
@@ -181,3 +196,25 @@ (def-callback log-handler (c-call:void (domain c-call:c-string)
   (error "~A: ~A" domain message))
 
 (setf (extern-alien "log_handler" system-area-pointer) (callback log-handler))
+
+
+;;;; Convenient macros
+
+(defmacro def-callback-marshal (name (return-type &rest args))
+  (let ((names (loop 
+		for arg in args 
+		collect (if (atom arg) (gensym) (first arg))))
+	(types (loop 
+		for arg in args 
+		collect (if (atom arg) arg (second arg)))))
+    `(defcallback ,name (,return-type ,@(mapcar #'list names types)
+			 (callback-id unsigned-int))
+      (invoke-callback callback-id ',return-type ,@names))))
+
+(defmacro with-callback-function ((id function) &body body)
+  `(let ((,id (register-callback-function ,function)))
+    (unwind-protect
+	 (progn ,@body)
+      (destroy-user-data ,id))))
+
+