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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#ifndef QQMLABSTRACTBINDING_P_H
#define QQMLABSTRACTBINDING_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/qsharedpointer.h>
#include <QtCore/qshareddata.h>
#include <private/qtqmlglobal_p.h>
#include <private/qqmlproperty_p.h>
QT_BEGIN_NAMESPACE
class QQmlObjectCreator;
class Q_QML_PRIVATE_EXPORT QQmlAbstractBinding
{
protected:
QQmlAbstractBinding();
public:
virtual ~QQmlAbstractBinding();
typedef QExplicitlySharedDataPointer<QQmlAbstractBinding> Ptr;
virtual QString expression() const;
virtual bool isValueTypeProxy() const;
// Should return the encoded property index for the binding. Should return this value
// even if the binding is not enabled or added to an object.
// Encoding is: coreIndex | (valueTypeIndex << 16)
QQmlPropertyIndex targetPropertyIndex() const { return m_targetIndex; }
// Should return the object for the binding. Should return this object even if the
// binding is not enabled or added to the object.
QObject *targetObject() const { return m_target.data(); }
virtual void setEnabled(bool e, QQmlPropertyData::WriteFlags f = QQmlPropertyData::DontRemoveBinding) = 0;
void addToObject();
void removeFromObject();
static void printBindingLoopError(QQmlProperty &prop);
inline QQmlAbstractBinding *nextBinding() const;
inline bool canUseAccessor() const
{ return m_nextBinding.flag2(); }
struct RefCount {
RefCount() {}
int refCount = 0;
void ref() { ++refCount; }
int deref() { return --refCount; }
operator int() const { return refCount; }
};
RefCount ref;
protected:
friend class QQmlData;
friend class QQmlValueTypeProxyBinding;
friend class QQmlObjectCreator;
inline void setAddedToObject(bool v);
inline bool isAddedToObject() const;
inline void setNextBinding(QQmlAbstractBinding *);
QQmlPropertyIndex m_targetIndex;
// Pointer is the target object to which the binding binds
// flag1 is the updating flag
// flag2 is the enabled flag
QFlagPointer<QObject> m_target;
// Pointer to the next binding in the linked list of bindings.
// flag1 is used for addedToObject
// flag2 indicates if an accessor is can be used (i.e. there is no interceptor on the target)
QFlagPointer<QQmlAbstractBinding> m_nextBinding;
};
void QQmlAbstractBinding::setAddedToObject(bool v)
{
m_nextBinding.setFlagValue(v);
}
bool QQmlAbstractBinding::isAddedToObject() const
{
return m_nextBinding.flag();
}
QQmlAbstractBinding *QQmlAbstractBinding::nextBinding() const
{
return m_nextBinding.data();
}
void QQmlAbstractBinding::setNextBinding(QQmlAbstractBinding *b)
{
if (b)
b->ref.ref();
if (m_nextBinding.data() && !m_nextBinding->ref.deref())
delete m_nextBinding.data();
m_nextBinding = b;
}
QT_END_NAMESPACE
#endif // QQMLABSTRACTBINDING_P_H
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