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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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 QQmlAnyBinding;
class Q_QML_EXPORT QQmlAbstractBinding
{
friend class QQmlAnyBinding;
protected:
QQmlAbstractBinding();
public:
enum Kind {
ValueTypeProxy,
QmlBinding,
PropertyToPropertyBinding,
};
virtual ~QQmlAbstractBinding();
typedef QExplicitlySharedDataPointer<QQmlAbstractBinding> Ptr;
virtual QString expression() const;
virtual Kind kind() const = 0;
// 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(); }
void setTarget(const QQmlProperty &);
bool setTarget(QObject *, const QQmlPropertyData &, const QQmlPropertyData *valueType);
bool setTarget(QObject *, int coreIndex, bool coreIsAlias, int valueTypeIndex);
virtual void setEnabled(bool e, QQmlPropertyData::WriteFlags f = QQmlPropertyData::DontRemoveBinding) = 0;
void addToObject();
void removeFromObject();
static void printBindingLoopError(const QQmlProperty &prop);
inline QQmlAbstractBinding *nextBinding() const;
inline bool canUseAccessor() const
{ return m_nextBinding.tag().testFlag(CanUseAccessor); }
void setCanUseAccessor(bool canUseAccessor)
{ m_nextBinding.setTag(m_nextBinding.tag().setFlag(CanUseAccessor, canUseAccessor)); }
struct RefCount {
RefCount() {}
int refCount = 0;
void ref() { ++refCount; }
int deref() { return --refCount; }
operator int() const { return refCount; }
};
RefCount ref;
enum TargetTag {
NoTargetTag = 0x0,
UpdatingBinding = 0x1,
BindingEnabled = 0x2
};
Q_DECLARE_FLAGS(TargetTags, TargetTag)
enum NextBindingTag {
NoBindingTag = 0x0,
AddedToObject = 0x1,
CanUseAccessor = 0x2
};
Q_DECLARE_FLAGS(NextBindingTags, NextBindingTag)
protected:
friend class QQmlData;
friend class QQmlValueTypeProxyBinding;
friend class QQmlObjectCreator;
inline void setAddedToObject(bool v);
inline bool isAddedToObject() const;
inline void setNextBinding(QQmlAbstractBinding *);
void getPropertyData(
const QQmlPropertyData **propertyData, QQmlPropertyData *valueTypeData) const;
inline bool updatingFlag() const;
inline void setUpdatingFlag(bool);
inline bool enabledFlag() const;
inline void setEnabledFlag(bool);
void updateCanUseAccessor();
QQmlPropertyIndex m_targetIndex;
// Pointer is the target object to which the binding binds
QTaggedPointer<QObject, TargetTags> m_target;
// Pointer to the next binding in the linked list of bindings.
QTaggedPointer<QQmlAbstractBinding, NextBindingTags> m_nextBinding;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QQmlAbstractBinding::TargetTags)
Q_DECLARE_OPERATORS_FOR_FLAGS(QQmlAbstractBinding::NextBindingTags)
void QQmlAbstractBinding::setAddedToObject(bool v)
{
m_nextBinding.setTag(m_nextBinding.tag().setFlag(AddedToObject, v));
}
bool QQmlAbstractBinding::isAddedToObject() const
{
return m_nextBinding.tag().testFlag(AddedToObject);
}
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;
}
bool QQmlAbstractBinding::updatingFlag() const
{
return m_target.tag().testFlag(UpdatingBinding);
}
void QQmlAbstractBinding::setUpdatingFlag(bool v)
{
m_target.setTag(m_target.tag().setFlag(UpdatingBinding, v));
}
bool QQmlAbstractBinding::enabledFlag() const
{
return m_target.tag().testFlag(BindingEnabled);
}
void QQmlAbstractBinding::setEnabledFlag(bool v)
{
m_target.setTag(m_target.tag().setFlag(BindingEnabled, v));
}
QT_END_NAMESPACE
#endif // QQMLABSTRACTBINDING_P_H
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