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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml 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 QQMLPROPERTYBINDING_P_H
#define QQMLPROPERTYBINDING_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qproperty.h>
#include <QtCore/private/qproperty_p.h>
#include "qqmlpropertydata_p.h"
#include "qqmljavascriptexpression_p.h"
#include <memory>
QT_BEGIN_NAMESPACE
class QQmlPropertyBinding : public QQmlJavaScriptExpression,
public QPropertyBindingPrivate
{
public:
static constexpr auto propertyBindingOffset() {
QT_WARNING_PUSH QT_WARNING_DISABLE_INVALID_OFFSETOF
return offsetof(QQmlPropertyBinding, ref);
QT_WARNING_POP
}
static QUntypedPropertyBinding create(const QQmlPropertyData *pd, QV4::Function *function,
QObject *obj, const QQmlRefPointer<QQmlContextData> &ctxt,
QV4::ExecutionContext *scope, QObject *target,
QQmlPropertyIndex targetIndex);
void expressionChanged() override;
static bool doEvaluate(QMetaType metaType, QUntypedPropertyData *dataPtr, void *f) {
auto address = static_cast<std::byte*>(f);
address -= sizeof (QPropertyBindingPrivate); // f now points to QPropertyBindingPrivate suboject
address -= QQmlPropertyBinding::propertyBindingOffset(); // f now points to QQmlPropertyBinding
return reinterpret_cast<QQmlPropertyBinding *>(address)->evaluate(metaType, dataPtr);
}
private:
QQmlPropertyBinding(QMetaType metaType, QObject *target, QQmlPropertyIndex targetIndex);
bool evaluate(QMetaType metaType, void *dataPtr);
QString createBindingLoopErrorDescription(QJSEnginePrivate *ep);
struct TargetData {
QObject *target;
QQmlPropertyIndex targetIndex;
};
QObject *target();
QQmlPropertyIndex targetIndex();
static void bindingErrorCallback(QPropertyBindingPrivate *);
};
template <auto I>
struct Print {};
namespace QtPrivate {
template<>
inline constexpr BindingFunctionVTable bindingFunctionVTable<QQmlPropertyBinding> = {
&QQmlPropertyBinding::doEvaluate,
[](void *qpropertyBinding){
auto address = static_cast<std::byte*>(qpropertyBinding);
address -= QQmlPropertyBinding::propertyBindingOffset(); // f now points to QQmlPropertyBinding
reinterpret_cast<QQmlPropertyBinding *>(address)->~QQmlPropertyBinding();
delete[] address;
},
[](void *, void *){},
0
};
}
class QQmlTranslationPropertyBinding
{
public:
static QUntypedPropertyBinding create(const QQmlPropertyData *pd,
const QQmlRefPointer<QV4::ExecutableCompilationUnit> &compilationUnit,
const QV4::CompiledData::Binding *binding);
};
QT_END_NAMESPACE
#endif // QQMLPROPERTYBINDING_P_H
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