supply the same interface with optional arguments as before. increment callback functions when they are registered.

wrap/callback.i

@@ -6,18 +6,14 @@
  */
 static void PythonMouseCallback(ob::MouseData *data, void *pyfunc)
 {
-  PyObject *func, *arglist, *pdata;
+  PyObject *arglist, *pdata, *result;
-  PyObject *result;
-  double    dres = 0;
-
-  func = (PyObject*) pyfunc;
 
   pdata = SWIG_NewPointerObj((void *) data, SWIGTYPE_p_ob__MouseData, 0);
   arglist = Py_BuildValue("(O)", pdata);
   Py_DECREF(pdata);
 
   // call the callback
-  result = PyEval_CallObject(func, arglist);
+  result = PyEval_CallObject((PyObject*)pyfunc, arglist);
   if (!result || PyErr_Occurred()) {
     // an exception occured in the script, display it
     PyErr_Print();
@@ -32,18 +28,14 @@ static void PythonMouseCallback(ob::MouseData *data, void *pyfunc)
  */
 static void PythonKeyCallback(ob::KeyData *data, void *pyfunc)
 {
-  PyObject *func, *arglist, *pdata;
+  PyObject *arglist, *pdata, *result;
-  PyObject *result;
-  double    dres = 0;
-
-  func = (PyObject*) pyfunc;
 
   pdata = SWIG_NewPointerObj((void *) data, SWIGTYPE_p_ob__KeyData, 0);
   arglist = Py_BuildValue("(O)", pdata);
   Py_DECREF(pdata);
 
   // call the callback
-  result = PyEval_CallObject(func, arglist);
+  result = PyEval_CallObject((PyObject*)pyfunc, arglist);
   if (!result || PyErr_Occurred()) {
     // an exception occured in the script, display it
     PyErr_Print();
@@ -58,18 +50,14 @@ static void PythonKeyCallback(ob::KeyData *data, void *pyfunc)
  */
 static void PythonEventCallback(ob::EventData *data, void *pyfunc)
 {
-  PyObject *func, *arglist, *pdata;
+  PyObject *arglist, *pdata, *result;
-  PyObject *result;
-  double    dres = 0;
-
-  func = (PyObject*) pyfunc;
 
   pdata = SWIG_NewPointerObj((void *) data, SWIGTYPE_p_ob__EventData, 0);
   arglist = Py_BuildValue("(O)", pdata);
   Py_DECREF(pdata);
 
   // call the callback
-  result = PyEval_CallObject(func, arglist);
+  result = PyEval_CallObject((PyObject*)pyfunc, arglist);
   if (!result || PyErr_Occurred()) {
     // an exception occured in the script, display it
     PyErr_Print();
@@ -129,6 +117,7 @@ bool mbind(const std::string &button, ob::MouseContext::MC context,
     PyErr_SetString(PyExc_RuntimeError,"Unable to add binding.");
     return false;
   }
+  Py_INCREF(func);
   return true;
 }
 
@@ -143,6 +132,7 @@ bool ebind(ob::EventAction::EA action, PyObject *func)
     PyErr_SetString(PyExc_RuntimeError,"Unable to add binding.");
     return false;
   }
+  Py_INCREF(func);
   return true;
 }
 
@@ -153,6 +143,7 @@ bool kgrab(int screen, PyObject *func)
     PyErr_SetString(PyExc_RuntimeError,"Unable to grab keybaord.");
     return false;
   }
+  Py_INCREF(func);
   return true;
 }
 
@@ -202,6 +193,7 @@ bool kbind(PyObject *keylist, ob::KeyContext::KC context, PyObject *func)
     PyErr_SetString(PyExc_RuntimeError,"Unable to add binding.");
     return false;
   }
+  Py_INCREF(func);
   return true;
 }
 

wrap/ob.i

@@ -68,8 +68,8 @@ void set_reset_key(const std::string &key)
 }
 
 void send_client_msg(Window target, Atom type, Window about,
-                     long data, long data1, long data2,
+                     long data=0, long data1=0, long data2=0,
-                     long data3, long data4)
+                     long data3=0, long data4=0)
 {
   XEvent e;
   e.xclient.type = ClientMessage;
@@ -87,7 +87,7 @@ void send_client_msg(Window target, Atom type, Window about,
              &e);
 }
 
-void execute(const std::string &bin, int screen)
+void execute(const std::string &bin, int screen=0)
 {
   if (screen >= ScreenCount(**otk::display))
     screen = 0;