Moved code

[cl-gtk2.git] / glib / gobject.foreign-gobject.lisp

diff --git a/glib/gobject.foreign-gobject.lisp b/glib/gobject.foreign-gobject.lisp
index 6b56e89..15fa956 100644 (file)
--- a/glib/gobject.foreign-gobject.lisp
+++ b/glib/gobject.foreign-gobject.lisp
@@ -1,5 +1,21 @@
 (in-package :gobject)
 
+(defun g-type-from-object (object)
+  "Returns the GType of an @code{object}
+
+@arg[object]{C pointer to an object}
+@return{GType designator (see @class{g-type-designator})}"
+  (g-type-from-instance object))
+
+(defun g-type-from-class (g-class)
+  (g-type-name (foreign-slot-value g-class 'g-type-class :type)))
+
+(defun g-type-from-instance (type-instance)
+  (g-type-from-class (foreign-slot-value type-instance 'g-type-instance :class)))
+
+(defun g-type-from-interface (type-interface)
+  (g-type-name (foreign-slot-value type-interface 'g-type-interface :type)))
+
 (defclass g-object ()
   ((pointer
     :type cffi:foreign-pointer
@@ -326,3 +342,30 @@
 (defmethod set-gvalue-for-type (gvalue-ptr (type-numeric (eql +g-type-interface+)) value)
   (set-gvalue-object gvalue-ptr value))
 
+(defun emit-signal (object signal-name &rest args)
+  "Emits the signal.
+@arg[object]{an instance of @class{g-object}. Signal is emitted on this object}
+@arg[signal-name]{a string specifying the signal}
+@arg[args]{arguments for the signal}
+@return{none}"
+  (let* ((object-type (g-type-from-object (pointer object)))
+         (signal-info (parse-signal-name object-type signal-name)))
+    (unless signal-info
+      (error "Signal ~A not found on object ~A" signal-name object))
+    (let ((params-count (length (signal-info-param-types signal-info))))
+      (with-foreign-object (params 'g-value (1+ params-count))
+        (set-g-value (mem-aref params 'g-value 0) object object-type :zero-g-value t)
+        (iter (for i from 0 below params-count)
+              (for arg in args)
+              (for type in (signal-info-param-types signal-info))
+              (set-g-value (mem-aref params 'g-value (1+ i)) arg type :zero-g-value t))
+        (prog1
+            (if (= (g-type-numeric (signal-info-return-type signal-info)) +g-type-void+)
+                (g-signal-emitv params (signal-info-id signal-info) signal-name (null-pointer))
+                (with-foreign-object (return-value 'g-value)
+                  (g-value-zero return-value)
+                  (g-value-init return-value (signal-info-return-type signal-info))
+                  (prog1 (parse-gvalue return-value)
+                    (g-value-unset return-value))))
+          (iter (for i from 0 below (1+ params-count))
+                (g-value-unset (mem-aref params 'g-value i))))))))