1 files changed, 82 insertions, 0 deletions
diff --git a/src/python.cc b/src/python.cc
new file mode 100644
index 00000000..a00bc245
--- /dev/null
+++ b/src/python.cc
@@ -0,0 +1,82 @@
+// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
+
+#include "python.hh"
+
+#include <vector>
+#include <algorithm>
+
+namespace ob {
+
+typedef std::vector<PyObject*> FunctionList;
+
+static FunctionList callbacks[OBActions::NUM_ACTIONS];
+
+bool python_register(int action, PyObject *callback)
+{
+  if (action < 0 || action >= OBActions::NUM_ACTIONS) {
+    PyErr_SetString(PyExc_AssertionError, "Invalid action type.");
+    return false;
+  }
+  if (!PyCallable_Check(callback)) {
+    PyErr_SetString(PyExc_AssertionError, "Invalid callback function.");
+    return false;
+  }
+  
+  FunctionList::iterator it = std::find(callbacks[action].begin(),
+					callbacks[action].end(),
+					callback);
+  if (it == callbacks[action].end()) { // not already in there
+    Py_XINCREF(callback);              // Add a reference to new callback
+    callbacks[action].push_back(callback);
+  }
+  return true;
+}
+
+bool python_unregister(int action, PyObject *callback)
+{
+  if (action < 0 || action >= OBActions::NUM_ACTIONS) {
+    PyErr_SetString(PyExc_AssertionError, "Invalid action type.");
+    return false;
+  }
+  if (!PyCallable_Check(callback)) {
+    PyErr_SetString(PyExc_AssertionError, "Invalid callback function.");
+    return false;
+  }
+
+  FunctionList::iterator it = std::find(callbacks[action].begin(),
+					callbacks[action].end(),
+					callback);
+  if (it != callbacks[action].end()) { // its been registered before
+    Py_XDECREF(*it);                   // Dispose of previous callback
+    callbacks[action].erase(it);
+  }
+  return true;
+}
+
+void python_callback(OBActions::ActionType action, Window window,
+                     OBWidget::WidgetType type, unsigned int state,
+                     long d1, long d2)
+{
+  PyObject *arglist;
+  PyObject *result;
+
+  assert(action >= 0 && action < OBActions::NUM_ACTIONS);
+
+  arglist = Py_BuildValue("iliill", action, window, type, state, d1, d2);
+
+  FunctionList::iterator it, end = callbacks[action].end();
+  for (it = callbacks[action].begin(); it != end; ++it) {
+    // call the callback
+    result = PyEval_CallObject(*it, arglist);
+    if (result) {
+      Py_DECREF(result);
+    } else {
+      // an exception occured in the script, display it
+      PyErr_Print();
+    }
+  }
+
+  Py_DECREF(arglist);
+}
+
+}