diff options
Diffstat (limited to 'sources/shiboken2/libshiboken/qapp_macro.cpp')
| -rw-r--r-- | sources/shiboken2/libshiboken/qapp_macro.cpp | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/sources/shiboken2/libshiboken/qapp_macro.cpp b/sources/shiboken2/libshiboken/qapp_macro.cpp new file mode 100644 index 000000000..b31e98d06 --- /dev/null +++ b/sources/shiboken2/libshiboken/qapp_macro.cpp @@ -0,0 +1,184 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of PySide2. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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" + +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 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 = NULL; +static PyObject *qApp_content = (PyObject *)&_Py_ChameleonQAppWrapper_Struct; +static PyObject *qApp_moduledicts[5] = {0, 0, 0, 0, 0}; +static int qApp_var_ref = 0; +static int qApp_content_ref = 0; + +static int +reset_qApp_var() +{ + PyObject **mod_ptr; + + for (mod_ptr = qApp_moduledicts; *mod_ptr != NULL; mod_ptr++) { + // We respect whatever the user may have set. + if (PyDict_GetItem(*mod_ptr, qApp_var) == NULL) + if (PyDict_SetItem(*mod_ptr, qApp_var, qApp_content) < 0) + return -1; + } + return 0; +} + + +PyObject * +MakeSingletonQAppWrapper(PyTypeObject *type) +{ + if (type == NULL) + type = Py_NONE_TYPE; + if (!(type == Py_NONE_TYPE || Py_TYPE(qApp_content) == Py_NONE_TYPE)) { + const char *res_name = strrchr(Py_TYPE(qApp_content)->tp_name, '.')+1; + const char *type_name = strrchr(type->tp_name, '.')+1; + PyErr_Format(PyExc_RuntimeError, "Please destroy the %s singleton before" + " creating a new %s instance.", res_name, type_name); + return NULL; + } + if (reset_qApp_var() < 0) + return NULL; + // 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) + 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(). + PyObject *__moduleShutdown = PyDict_GetItemString(qApp_moduledicts[1], + "__moduleShutdown"); + if (__moduleShutdown != NULL) { + Py_DECREF(PyObject_CallFunction(__moduleShutdown, (char *)"()")); + } + // restore the "None-state" + Py_TYPE(qApp_content) = Py_NONE_TYPE; + Py_REFCNT(qApp_var) = qApp_var_ref; + Py_REFCNT(qApp_content) = qApp_content_ref; + } + else + (void)PyObject_INIT(qApp_content, type); + Py_INCREF(qApp_content); + return qApp_content; +} + +static int +setup_qApp_var(PyObject *module) +{ + int module_index; + static int init_done = 0; + + if (!init_done) { + qApp_var = Py_BuildValue("s", "qApp"); + if (qApp_var == NULL) + return -1; + qApp_moduledicts[0] = PyEval_GetBuiltins(); + 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) { + qApp_moduledicts[module_index] = PyModule_GetDict(module); + if (reset_qApp_var() < 0) + return -1; + } + return 0; +} + +void +NotifyModuleForQApp(PyObject *module) +{ + setup_qApp_var(module); +} + + +} //extern "C" + +// end of module |