/****************************************************************************
**
** Copyright (C) 2016 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

static QString retrieveObjectName(PyObject *obj)
{
    Shiboken::AutoDecRef objName(PyObject_Str(obj));
    return QString(Shiboken::String::toCString(objName));
}


/**
 * Tranfer objects ownership from layout to widget
 **/
static inline void qwidgetReparentLayout(QWidget *parent, QLayout *layout)
{
    Shiboken::AutoDecRef pyParent(%CONVERTTOPYTHON[QWidget*](parent));

    for (int i=0; i < layout->count(); i++) {
        QLayoutItem* item = layout->itemAt(i);
        if (PyErr_Occurred() || !item)
            return;

        QWidget* w = item->widget();
        if (w) {
            QWidget* pw = w->parentWidget();
            if (pw != parent) {
                Shiboken::AutoDecRef pyChild(%CONVERTTOPYTHON[QWidget*](w));
                Shiboken::Object::setParent(pyParent, pyChild);
            }
        } else {
            QLayout* l = item->layout();
            if (l)
                qwidgetReparentLayout(parent, l);
        }
    }

    Shiboken::AutoDecRef pyChild(%CONVERTTOPYTHON[QLayout*](layout));
    Shiboken::Object::setParent(pyParent, pyChild);
    //remove previous references
    Shiboken::Object::keepReference(reinterpret_cast<SbkObject*>(pyChild.object()), qPrintable(retrieveObjectName(pyChild)), Py_None);
}

static inline void qwidgetSetLayout(QWidget *self, QLayout *layout)
{
    if (!layout || self->layout())
        return;

    QObject* oldParent = layout->parent();
    if (oldParent && oldParent != self) {
        if (oldParent->isWidgetType()) {
            // remove old parent policy
            Shiboken::AutoDecRef pyLayout(%CONVERTTOPYTHON[QLayout*](layout));
            Shiboken::Object::setParent(Py_None, pyLayout);
        } else {
            PyErr_Format(PyExc_RuntimeError, "QWidget::setLayout: Attempting to set QLayout \"%s\" on %s \"%s\", when the QLayout already has a parent",
                          qPrintable(layout->objectName()), self->metaObject()->className(), qPrintable(self->objectName()));
            return;
        }
    }

    if (oldParent != self) {
        qwidgetReparentLayout(self, layout);
        if (PyErr_Occurred())
            return;

        self->setLayout(layout);
    }
}