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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QABSTRACTPROXYMODEL_P_H
#define QABSTRACTPROXYMODEL_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of QAbstractItemModel*. This header file may change from version
// to version without notice, or even be removed.
//
// We mean it.
//
//
#include "private/qabstractitemmodel_p.h"
#include "private/qproperty_p.h"
QT_REQUIRE_CONFIG(proxymodel);
QT_BEGIN_NAMESPACE
class QAbstractProxyModelBindable : public QUntypedBindable
{
public:
explicit QAbstractProxyModelBindable(QUntypedPropertyData *d,
const QtPrivate::QBindableInterface *i)
: QUntypedBindable(d, i)
{
}
};
class Q_CORE_EXPORT QAbstractProxyModelPrivate : public QAbstractItemModelPrivate
{
Q_DECLARE_PUBLIC(QAbstractProxyModel)
public:
QAbstractProxyModelPrivate() : QAbstractItemModelPrivate() { }
void setModelForwarder(QAbstractItemModel *sourceModel)
{
q_func()->setSourceModel(sourceModel);
}
void modelChangedForwarder()
{
Q_EMIT q_func()->sourceModelChanged(QAbstractProxyModel::QPrivateSignal());
}
Q_OBJECT_COMPAT_PROPERTY_WITH_ARGS(QAbstractProxyModelPrivate, QAbstractItemModel *, model,
&QAbstractProxyModelPrivate::setModelForwarder,
&QAbstractProxyModelPrivate::modelChangedForwarder, nullptr)
virtual void _q_sourceModelDestroyed();
void mapDropCoordinatesToSource(int row, int column, const QModelIndex &parent,
int *source_row, int *source_column, QModelIndex *source_parent) const;
using ModelPropertyType = decltype(model);
};
namespace QtPrivate {
/*!
The biggest trick for adding new QProperty binding support here is the
getter for the sourceModel property (QAbstractProxyModel::sourceModel),
which returns nullptr, while internally using a global staticEmptyModel()
instance.
This lead to inconsistency while binding to a proxy model without source
model. The bound object would point to staticEmptyModel() instance, while
sourceModel() getter returns nullptr.
To solve this issue we need to implement a custom QBindableInterface, with
custom getter and makeBinding methods, that would introduce the required
logic.
*/
inline QAbstractItemModel *normalizePotentiallyEmptyModel(QAbstractItemModel *model)
{
if (model == QAbstractItemModelPrivate::staticEmptyModel())
return nullptr;
return model;
}
class QBindableInterfaceForSourceModel
{
using PropertyType = QAbstractProxyModelPrivate::ModelPropertyType;
using Parent = QBindableInterfaceForProperty<PropertyType>;
using T = typename PropertyType::value_type;
public:
static constexpr QBindableInterface iface = {
[](const QUntypedPropertyData *d, void *value) -> void {
const auto val = static_cast<const PropertyType *>(d)->value();
*static_cast<T *>(value) = normalizePotentiallyEmptyModel(val);
},
Parent::iface.setter,
Parent::iface.getBinding,
Parent::iface.setBinding,
[](const QUntypedPropertyData *d,
const QPropertyBindingSourceLocation &location) -> QUntypedPropertyBinding {
return Qt::makePropertyBinding(
[d]() -> T {
return normalizePotentiallyEmptyModel(
static_cast<const PropertyType *>(d)->value());
},
location);
},
Parent::iface.setObserver,
Parent::iface.metaType
};
};
} // namespace QtPrivate
QT_END_NAMESPACE
#endif // QABSTRACTPROXYMODEL_P_H
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