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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QQMLBINDING_P_H
#define QQMLBINDING_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 "qqml.h"
#include "qqmlpropertyvaluesource.h"
#include "qqmlexpression.h"
#include "qqmlproperty.h"
#include "qqmlproperty_p.h"
#include <QtCore/QObject>
#include <QtCore/QMetaProperty>
#include <private/qpointervaluepair_p.h>
QT_BEGIN_NAMESPACE
class Q_QML_PRIVATE_EXPORT QQmlAbstractBinding
{
public:
typedef QWeakPointer<QQmlAbstractBinding> Pointer;
QQmlAbstractBinding();
virtual void destroy();
virtual QString expression() const;
enum Type { PropertyBinding, ValueTypeProxy };
virtual Type bindingType() const { return PropertyBinding; }
// 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 << 24)
virtual int propertyIndex() const = 0;
// Should return the object for the binding. Should return this object even if the
// binding is not enabled or added to the object.
virtual QObject *object() const = 0;
void setEnabled(bool e) { setEnabled(e, QQmlPropertyPrivate::DontRemoveBinding); }
virtual void setEnabled(bool, QQmlPropertyPrivate::WriteFlags) = 0;
void update() { update(QQmlPropertyPrivate::DontRemoveBinding); }
virtual void update(QQmlPropertyPrivate::WriteFlags) = 0;
void addToObject();
void removeFromObject();
static inline Pointer getPointer(QQmlAbstractBinding *p);
protected:
virtual ~QQmlAbstractBinding();
void clear();
// Called by QQmlPropertyPrivate to "move" a binding to a different property.
// This is only used for alias properties, and only used by QQmlBinding not
// V8 or V4 bindings. The default implementation qFatal()'s to ensure that the
// method is never called for V4 or V8 bindings.
virtual void retargetBinding(QObject *, int);
private:
Pointer weakPointer();
friend class QQmlData;
friend class QQmlComponentPrivate;
friend class QQmlValueTypeProxyBinding;
friend class QQmlPropertyPrivate;
friend class QQmlVME;
friend class QtSharedPointer::ExternalRefCount<QQmlAbstractBinding>;
typedef QSharedPointer<QQmlAbstractBinding> SharedPointer;
// To save memory, we also store the rarely used weakPointer() instance in here
QPointerValuePair<QQmlAbstractBinding*, SharedPointer> m_mePtr;
QQmlAbstractBinding **m_prevBinding;
QQmlAbstractBinding *m_nextBinding;
};
class QQmlValueTypeProxyBinding : public QQmlAbstractBinding
{
public:
QQmlValueTypeProxyBinding(QObject *o, int coreIndex);
virtual Type bindingType() const { return ValueTypeProxy; }
virtual void setEnabled(bool, QQmlPropertyPrivate::WriteFlags);
virtual void update(QQmlPropertyPrivate::WriteFlags);
virtual int propertyIndex() const;
virtual QObject *object() const;
QQmlAbstractBinding *binding(int propertyIndex);
void removeBindings(quint32 mask);
protected:
~QQmlValueTypeProxyBinding();
private:
void recursiveEnable(QQmlAbstractBinding *, QQmlPropertyPrivate::WriteFlags);
void recursiveDisable(QQmlAbstractBinding *);
friend class QQmlAbstractBinding;
QObject *m_object;
int m_index;
QQmlAbstractBinding *m_bindings;
};
class QQmlContext;
class QQmlBindingPrivate;
class Q_QML_PRIVATE_EXPORT QQmlBinding : public QQmlExpression,
public QQmlAbstractBinding
{
Q_OBJECT
public:
enum EvaluateFlag { None = 0x00, RequiresThisObject = 0x01 };
Q_DECLARE_FLAGS(EvaluateFlags, EvaluateFlag)
QQmlBinding(const QString &, QObject *, QQmlContext *, QObject *parent=0);
QQmlBinding(const QString &, QObject *, QQmlContextData *, QObject *parent=0);
QQmlBinding(const QString &, bool isRewritten, QObject *, QQmlContextData *,
const QString &url, int lineNumber, int columnNumber = 0, QObject *parent=0);
QQmlBinding(void *, QObject *, QQmlContextData *, QObject *parent=0);
void setTarget(const QQmlProperty &);
void setTarget(QObject *, const QQmlPropertyData &, QQmlContextData *);
QQmlProperty property() const;
void setEvaluateFlags(EvaluateFlags flags);
EvaluateFlags evaluateFlags() const;
bool enabled() const;
// Inherited from QQmlAbstractBinding
virtual void setEnabled(bool, QQmlPropertyPrivate::WriteFlags flags);
virtual void update(QQmlPropertyPrivate::WriteFlags flags);
virtual QString expression() const;
virtual int propertyIndex() const;
virtual QObject *object() const;
virtual void retargetBinding(QObject *, int);
typedef int Identifier;
static Identifier Invalid;
static QQmlBinding *createBinding(Identifier, QObject *, QQmlContext *,
const QString &, int, QObject *parent=0);
public Q_SLOTS:
void update() { update(QQmlPropertyPrivate::DontRemoveBinding); }
protected:
~QQmlBinding();
private:
Q_DECLARE_PRIVATE(QQmlBinding)
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QQmlBinding::EvaluateFlags)
QQmlAbstractBinding::Pointer
QQmlAbstractBinding::getPointer(QQmlAbstractBinding *p)
{
return p ? p->weakPointer() : Pointer();
}
QT_END_NAMESPACE
Q_DECLARE_METATYPE(QQmlBinding*)
#endif // QQMLBINDING_P_H
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