--- a/include/window.h
+++ b/include/window.h
@@ -2197,6 +2197,12 @@
  */
 #define MSG_USER            0x0800
 
+#define MOUSE_UP         0x0001
+#define MOUSE_DOWN       0x0002
+#define MOUSE_LEFT       0x0003
+#define MOUSE_RIGHT      0x0004
+#define MSG_MOUSE_FLING      (MSG_USER+100)
+#define MSG_MOUSE_SCROLL     (MSG_USER+101)
 #define MSG_LASTUSERMSG     0xEFFF
 
     /** @} end of user_msgs */