New typemaps for wxString when compiling for Python 2.0 and beyond

that allow Unicode objects to be passed as well as String objects.  If
a Unicode object is passed PyString_AsStringAndSize is used to convert
it to a wxString using the default encoding.

Fixed the generic buttons so tool tips work for them.

Fixed a bug in the demo's tree control.

Added a listbox to the listbox demo that shows how to find items with
a patching prefix as keys are typed.

Added code to the wxListCtrl demo to show how to get text from a
column in report mode.

Added code to the toolbar demo to clear the long help from the status
bar after 2 seconds.

Added wxJoystick.

Fixed wxTimer so it can be used as described in the docs, either with
a Notify method in a subclass, or sending an event to a wxEvtHandler
object, (usually a window.)

Added wxNotifyEvent.Allow()


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@8764 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/src/helpers.cpp

@@ -561,20 +561,26 @@ wxPyTimer::~wxPyTimer() {
 }
 
 void wxPyTimer::Notify() {
-    bool doSave = wxPyRestoreThread();
-
-    PyObject*   result;
-    PyObject*   args = Py_BuildValue("()");
-
-    result = PyEval_CallObject(func, args);
-    Py_DECREF(args);
-    if (result) {
-        Py_DECREF(result);
-        PyErr_Clear();
-    } else {
-        PyErr_Print();
+    if (!func || func == Py_None) {
+        wxTimer::Notify();
+    }
+    else {
+        bool doSave = wxPyRestoreThread();
+
+        PyObject*   result;
+        PyObject*   args = Py_BuildValue("()");
+
+        result = PyEval_CallObject(func, args);
+        Py_DECREF(args);
+        if (result) {
+            Py_DECREF(result);
+            PyErr_Clear();
+        } else {
+            PyErr_Print();
+        }
+
+        wxPySaveThread(doSave);
     }
-    wxPySaveThread(doSave);
 }