Add gtk:timer class

diff --git a/gtk/cl-gtk2-gtk.asd b/gtk/cl-gtk2-gtk.asd
index ee4ab70..621a7e9 100644 (file)
--- a/gtk/cl-gtk2-gtk.asd
+++ b/gtk/cl-gtk2-gtk.asd
@@ -60,6 +60,7 @@
                (:file "gtk.dialog.example")
                
                (:file "gtk.demo")
+               (:file "gtk.timer")
                (:module "demo-files"
                         :pathname "demo"
                         :components ((:static-file "demo1.glade")

diff --git a/gtk/gtk.timer.lisp b/gtk/gtk.timer.lisp
new file mode 100644 (file)
index 0000000..cc93064
--- /dev/null
+++ b/gtk/gtk.timer.lisp
@@ -0,0 +1,32 @@
+(in-package :gtk)
+
+(defclass timer ()
+  ((fn :initform nil :initarg :fn :accessor timer-fn)
+   (interval-msec :initform 100 :initarg :interval-msec :accessor timer-interval-msec)
+   (source-id :initform nil)))
+
+(defun timer-enabled-p (timer)
+  (not (null (slot-value timer 'source-id))))
+
+(defun (setf timer-enabled-p) (new-value timer)
+  (unless (eq new-value (timer-enabled-p timer))
+    (if new-value
+        (start-timer timer)
+        (stop-timer timer))))
+
+(defmethod (setf timer-interval-msec) :after (new-value (timer timer))
+  (when (timer-enabled-p timer)
+    (stop-timer timer)
+    (start-timer timer)))
+
+(defun start-timer (timer)
+  (unless (slot-value timer 'source-id)
+    (setf (slot-value timer 'source-id)
+          (gtk-main-add-timeout (timer-interval-msec timer) (lambda () (funcall (timer-fn timer)))))))
+
+(defun stop-timer (timer)
+  (when (slot-value timer 'source-id)
+    (glib:g-source-remove (slot-value timer 'source-id))
+    (setf (slot-value timer 'source-id) nil)))
+
+(export '(timer timer-fn timer-interval-msec timer-enabled-p timer-interval-msec start-timer stop-timer))