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/****************************************************************************
**
** Copyright (C) 2020 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 QPROPERTYPRIVATE_H
#define QPROPERTYPRIVATE_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
#include <QtCore/QExplicitlySharedDataPointer>
#include <QtCore/qtaggedpointer.h>
#include <QtCore/qmetatype.h>
#include <functional>
QT_BEGIN_NAMESPACE
class QUntypedPropertyBinding;
class QPropertyBindingPrivate;
using QPropertyBindingPrivatePtr = QExplicitlySharedDataPointer<QPropertyBindingPrivate>;
struct QPropertyBindingDataPointer;
class QUntypedPropertyData
{
public:
// sentinel to check whether a class inherits QUntypedPropertyData
struct InheritsQUntypedPropertyData {};
};
namespace QtPrivate {
// writes binding result into dataPtr
using QPropertyBindingFunction = std::function<bool(QMetaType metaType, QUntypedPropertyData *dataPtr)>;
using QPropertyObserverCallback = void (*)(QUntypedPropertyData *);
using QPropertyBindingWrapper = bool(*)(QMetaType, QUntypedPropertyData *dataPtr, QPropertyBindingFunction);
class Q_CORE_EXPORT QPropertyBindingData
{
// Mutable because the address of the observer of the currently evaluating binding is stored here, for
// notification later when the value changes.
mutable quintptr d_ptr = 0;
friend struct QT_PREPEND_NAMESPACE(QPropertyBindingDataPointer);
Q_DISABLE_COPY(QPropertyBindingData)
public:
QPropertyBindingData() = default;
QPropertyBindingData(QPropertyBindingData &&other, QUntypedPropertyData *propertyDataPtr);
QPropertyBindingData &operator=(QPropertyBindingData &&other) = delete;
~QPropertyBindingData();
void moveAssign(QPropertyBindingData &&other, QUntypedPropertyData *propertyDataPtr);
bool hasBinding() const { return d_ptr & BindingBit; }
QUntypedPropertyBinding setBinding(const QUntypedPropertyBinding &newBinding,
QUntypedPropertyData *propertyDataPtr,
QPropertyObserverCallback staticObserverCallback = nullptr,
QPropertyBindingWrapper bindingWrapper = nullptr);
QPropertyBindingPrivate *binding() const;
void evaluateIfDirty(const QUntypedPropertyData *property) const;
void removeBinding();
void registerWithCurrentlyEvaluatingBinding() const;
void notifyObservers(QUntypedPropertyData *propertyDataPtr) const;
void setExtraBit(bool b)
{
if (b)
d_ptr |= ExtraBit;
else
d_ptr &= ~ExtraBit;
}
bool extraBit() const { return d_ptr & ExtraBit; }
static const quintptr ExtraBit = 0x1; // Used for QProperty<bool> specialization
static const quintptr BindingBit = 0x2; // Is d_ptr pointing to a binding (1) or list of notifiers (0)?
static const quintptr FlagMask = BindingBit | ExtraBit;
};
template <typename T, typename Tag>
class QTagPreservingPointerToPointer
{
public:
QTagPreservingPointerToPointer() = default;
QTagPreservingPointerToPointer(T **ptr)
: d(reinterpret_cast<quintptr*>(ptr))
{}
QTagPreservingPointerToPointer<T, Tag> &operator=(T **ptr)
{
d = reinterpret_cast<quintptr*>(ptr);
return *this;
}
QTagPreservingPointerToPointer<T, Tag> &operator=(QTaggedPointer<T, Tag> *ptr)
{
d = reinterpret_cast<quintptr*>(ptr);
return *this;
}
void clear()
{
d = nullptr;
}
void setPointer(T *ptr)
{
*d = (reinterpret_cast<quintptr>(ptr) & QTaggedPointer<T, Tag>::pointerMask()) | (*d & QTaggedPointer<T, Tag>::tagMask());
}
T *get() const
{
return reinterpret_cast<T*>(*d & QTaggedPointer<T, Tag>::pointerMask());
}
explicit operator bool() const
{
return d != nullptr;
}
private:
quintptr *d = nullptr;
};
namespace detail {
template <typename F>
struct ExtractClassFromFunctionPointer;
template<typename T, typename C>
struct ExtractClassFromFunctionPointer<T C::*> { using Class = C; };
constexpr size_t getOffset(size_t o)
{
return o;
}
constexpr size_t getOffset(size_t (*offsetFn)())
{
return offsetFn();
}
}
} // namespace QtPrivate
QT_END_NAMESPACE
#endif // QPROPERTYPRIVATE_H
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