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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt for Python.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "basewrapper.h"
#include "autodecref.h"
extern "C"
{
#include "qapp_macro.h"
////////////////////////////////////////////////////////////////////////////
//
// Support for the qApp macro.
//
// qApp is a macro in Qt5. In Python, we simulate that a little by a
// variable that monitors Q*Application.instance().
// This variable is also able to destroy the app by deleting qApp.
//
static int
qApp_module_index(PyObject *module)
{
const char *name = PyModule_GetName(module);
int ret = 0;
if (strcmp(name, "PySide2.QtCore") == 0)
ret = 1;
else if (strcmp(name, "PySide2.QtGui") == 0)
ret = 2;
else if (strcmp(name, "PySide2.QtWidgets") == 0)
ret = 3;
return ret;
}
#define PYTHON_IS_PYTHON3 (PY_VERSION_HEX >= 0x03000000)
#define PYTHON_IS_PYTHON2 (!PYTHON_IS_PYTHON3)
#define Py_NONE_TYPE Py_TYPE(Py_None)
#if PYTHON_IS_PYTHON3
# define BRACE_OPEN {
# define BRACE_CLOSE }
#else
# define BRACE_OPEN
# define BRACE_CLOSE
#endif
static SbkObject _Py_ChameleonQAppWrapper_Struct = {
BRACE_OPEN
_PyObject_EXTRA_INIT
1, Py_NONE_TYPE
BRACE_CLOSE
};
static PyObject *qApp_var = nullptr;
static PyObject *qApp_content = reinterpret_cast<PyObject *>(&_Py_ChameleonQAppWrapper_Struct);
static PyObject *qApp_moduledicts[5] = {nullptr, nullptr, nullptr, nullptr, nullptr};
static int qApp_var_ref = 0;
static int qApp_content_ref = 0;
static int
reset_qApp_var(void)
{
PyObject **mod_ptr;
for (mod_ptr = qApp_moduledicts; *mod_ptr != nullptr; mod_ptr++) {
// We respect whatever the user may have set.
PyObject *existing = PyDict_GetItem(*mod_ptr, qApp_var);
if (existing == nullptr || Py_TYPE(existing) == Py_NONE_TYPE) {
if (PyDict_SetItem(*mod_ptr, qApp_var, qApp_content) < 0)
return -1;
}
}
return 0;
}
/*
* Note:
* The PYSIDE-585 problem was that shutdown is called one more often
* than Q*Application is created. We could special-case that last
* shutdown or add a refcount, initially, but actually it was easier
* and more intuitive in that context to make the refcount of
* qApp_content equal to the refcount of Py_None.
*/
PyObject *
MakeSingletonQAppWrapper(PyTypeObject *type)
{
if (type == nullptr)
type = Py_NONE_TYPE;
if (!(type == Py_NONE_TYPE || Py_TYPE(qApp_content) == Py_NONE_TYPE)) {
const char *res_name = PepType_GetNameStr(Py_TYPE(qApp_content));
const char *type_name = PepType_GetNameStr(type);
PyErr_Format(PyExc_RuntimeError, "Please destroy the %s singleton before"
" creating a new %s instance.", res_name, type_name);
return nullptr;
}
if (reset_qApp_var() < 0)
return nullptr;
// always know the max of the refs
if (Py_REFCNT(qApp_var) > qApp_var_ref)
qApp_var_ref = Py_REFCNT(qApp_var);
if (Py_REFCNT(qApp_content) > qApp_content_ref)
qApp_content_ref = Py_REFCNT(qApp_content);
if (Py_TYPE(qApp_content) != Py_NONE_TYPE) {
// Remove the "_" variable which might hold a reference to qApp.
Shiboken::AutoDecRef pymain(PyImport_ImportModule("__main__"));
if (pymain.object() && PyObject_HasAttrString(pymain.object(), "_"))
PyObject_DelAttrString(pymain.object(), "_");
Py_REFCNT(qApp_var) = 1; // fuse is armed...
}
if (type == Py_NONE_TYPE) {
// Debug mode showed that we need to do more than just remove the
// reference. To keep everything in the right order, it is easiest
// to do a full shutdown, using QtCore.__moduleShutdown().
// restore the "None-state"
PyObject *__moduleShutdown = PyDict_GetItemString(qApp_moduledicts[1],
"__moduleShutdown");
// PYSIDE-585: It was crucial to update the refcounts *before*
// calling the shutdown.
Py_TYPE(qApp_content) = Py_NONE_TYPE;
Py_REFCNT(qApp_var) = qApp_var_ref;
Py_REFCNT(qApp_content) = Py_REFCNT(Py_None);
if (__moduleShutdown != nullptr)
Py_XDECREF(PyObject_CallFunction(__moduleShutdown, const_cast<char *>("()")));
}
else
(void)PyObject_INIT(qApp_content, type);
Py_INCREF(qApp_content);
return qApp_content;
}
#if PYTHON_IS_PYTHON2
// Install support in Py_NONE_TYPE for Python 2: 'bool(qApp) == False'.
static int
none_bool(PyObject *v)
{
return 0;
}
static PyNumberMethods none_as_number = {
nullptr, /* nb_add */
nullptr, /* nb_subtract */
nullptr, /* nb_multiply */
nullptr, /* nb_divide */
nullptr, /* nb_remainder */
nullptr, /* nb_divmod */
nullptr, /* nb_power */
nullptr, /* nb_negative */
nullptr, /* nb_positive */
nullptr, /* nb_absolute */
reinterpret_cast<inquiry>(none_bool), /* nb_nonzero */
};
#endif
static int
setup_qApp_var(PyObject *module)
{
int module_index;
static int init_done = 0;
if (!init_done) {
#if PYTHON_IS_PYTHON2
Py_NONE_TYPE->tp_as_number = &none_as_number;
#endif
qApp_var = Py_BuildValue("s", "qApp");
if (qApp_var == nullptr)
return -1;
// This is a borrowed reference
qApp_moduledicts[0] = PyEval_GetBuiltins();
Py_INCREF(qApp_moduledicts[0]);
init_done = 1;
}
// Initialize qApp. We insert it into __dict__ for "import *" and also
// into __builtins__, to let it appear like a real macro.
module_index = qApp_module_index(module);
if (module_index) {
// This line gets a borrowed reference
qApp_moduledicts[module_index] = PyModule_GetDict(module);
Py_INCREF(qApp_moduledicts[module_index]);
if (reset_qApp_var() < 0)
return -1;
}
return 0;
}
void
NotifyModuleForQApp(PyObject *module, void *qApp)
{
setup_qApp_var(module);
/*
* PYSIDE-571: Check if an QApplication instance exists before the import.
* This happens in scriptableapplication and application_test.py .
*
* Crucial Observation
* ===================
*
* A Q*Application object from C++ does not have a wrapper or constructor
* like instances created by Python. It makes no sense to support
* deletion or special features like qApp resurrection.
*
* Therefore, the implementation is very simple and just redirects the
* qApp_contents variable and assigns the instance, instead of vice-versa.
*/
PyObject *coreDict = qApp_moduledicts[1];
if (qApp != nullptr && coreDict != nullptr) {
PyObject *coreApp = PyDict_GetItemString(coreDict, "QCoreApplication");
if (coreApp != nullptr) {
qApp_content = PyObject_CallMethod(coreApp, "instance", "");
reset_qApp_var();
}
}
}
} //extern "C"
// end of module
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