python with callbacks!
[mikachu/openbox.git] / src / python.cc
1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
2
3 #include "python.hh"
4
5 #include <vector>
6 #include <algorithm>
7
8 namespace ob {
9
10 typedef std::vector<PyObject*> FunctionList;
11
12 static FunctionList callbacks[OBActions::NUM_ACTIONS];
13
14 bool python_register(int action, PyObject *callback)
15 {
16   if (action < 0 || action >= OBActions::NUM_ACTIONS) {
17     PyErr_SetString(PyExc_AssertionError, "Invalid action type.");
18     return false;
19   }
20   if (!PyCallable_Check(callback)) {
21     PyErr_SetString(PyExc_AssertionError, "Invalid callback function.");
22     return false;
23   }
24   
25   FunctionList::iterator it = std::find(callbacks[action].begin(),
26                                         callbacks[action].end(),
27                                         callback);
28   if (it == callbacks[action].end()) { // not already in there
29     Py_XINCREF(callback);              // Add a reference to new callback
30     callbacks[action].push_back(callback);
31   }
32   return true;
33 }
34
35 bool python_unregister(int action, PyObject *callback)
36 {
37   if (action < 0 || action >= OBActions::NUM_ACTIONS) {
38     PyErr_SetString(PyExc_AssertionError, "Invalid action type.");
39     return false;
40   }
41   if (!PyCallable_Check(callback)) {
42     PyErr_SetString(PyExc_AssertionError, "Invalid callback function.");
43     return false;
44   }
45
46   FunctionList::iterator it = std::find(callbacks[action].begin(),
47                                         callbacks[action].end(),
48                                         callback);
49   if (it != callbacks[action].end()) { // its been registered before
50     Py_XDECREF(*it);                   // Dispose of previous callback
51     callbacks[action].erase(it);
52   }
53   return true;
54 }
55
56 void python_callback(OBActions::ActionType action, Window window,
57                      OBWidget::WidgetType type, unsigned int state,
58                      long d1, long d2)
59 {
60   PyObject *arglist;
61   PyObject *result;
62
63   assert(action >= 0 && action < OBActions::NUM_ACTIONS);
64
65   arglist = Py_BuildValue("iliill", action, window, type, state, d1, d2);
66
67   FunctionList::iterator it, end = callbacks[action].end();
68   for (it = callbacks[action].begin(); it != end; ++it) {
69     // call the callback
70     result = PyEval_CallObject(*it, arglist);
71     if (result) {
72       Py_DECREF(result);
73     } else {
74       // an exception occured in the script, display it
75       PyErr_Print();
76     }
77   }
78
79   Py_DECREF(arglist);
80 }
81
82 }