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// This implements the helpers for QAbstractEventDispatcher.
//
// Copyright (c) 2016 Riverbank Computing Limited <info@riverbankcomputing.com>
//
// This file is part of PyQt4.
//
// This file may be used under the terms of the GNU General Public License
// version 3.0 as published by the Free Software Foundation and appearing in
// the file LICENSE included in the packaging of this file. Please review the
// following information to ensure the GNU General Public License version 3.0
// requirements will be met: http://www.gnu.org/copyleft/gpl.html.
//
// If you do not wish to use this file under the terms of the GPL version 3.0
// then you may purchase a commercial license. For more information contact
// info@riverbankcomputing.com.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#include <Python.h>
#include <QAbstractEventDispatcher>
#include "qpycore_sip.h"
#if QT_VERSION < 0x050000
// A reference to the current Python event filter.
static PyObject *py_event_filter = 0;
// The dispatcher that the event filter is installed for. Note that we only
// support one dispatcher (because, as usual, the C++ API for callbacks is
// badly designed) and this allows us to raise an exception if the user tries
// to set a filter for more than one (i.e. one from another thread).
static QAbstractEventDispatcher *dispatcher = 0;
// Forward declarations.
static bool event_filter(void *message);
// The helper for QAbstractEventDispatcher::setEventFilter().
PyObject *qpycore_qabstracteventdispatcher_seteventfilter(
QAbstractEventDispatcher *dist, PyObject *filter)
{
// Check that this isn't a different dispatcher.
if (dispatcher && dispatcher != dist)
{
PyErr_SetString(PyExc_ValueError,
"PyQt only supports setting an event filter on a single "
"QAbstractEventDispatcher");
return 0;
}
// Make sure any previous filter has a corresponding Python object.
PyObject *old_filter = py_event_filter;
if (!old_filter)
{
old_filter = Py_None;
Py_INCREF(old_filter);
}
if (filter == Py_None)
{
// Remove any existing filter.
dist->setEventFilter(0);
py_event_filter = 0;
dispatcher = 0;
}
else
{
// Install the new filter.
Py_INCREF(filter);
py_event_filter = filter;
dispatcher = dist;
dist->setEventFilter(event_filter);
}
return old_filter;
}
// The event filter.
static bool event_filter(void *message)
{
bool res = false, raised = true;
SIP_BLOCK_THREADS
#if defined(Q_WS_WIN)
PyObject *msg_obj = sipConvertFromType(reinterpret_cast<MSG *>(message),
sipType_MSG, 0);
#else
PyObject *msg_obj = sipConvertFromVoidPtr(message);
#endif
if (msg_obj)
{
PyObject *res_obj = PyObject_CallFunctionObjArgs(py_event_filter,
msg_obj, 0);
Py_DECREF(msg_obj);
if (res_obj)
{
if (PyBool_Check(res_obj))
{
if (res_obj == Py_True)
res = true;
raised = false;
}
else
{
PyErr_Format(PyExc_TypeError,
"QAbstractEventDispatcher event filter returned a "
"'%s' instead of a 'bool'", Py_TYPE(res_obj)->tp_name);
}
Py_DECREF(res_obj);
}
}
if (raised)
PyErr_Print();
SIP_UNBLOCK_THREADS
return res;
}
#endif
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