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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 QtDeclarative 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 QDECLARATIVEBINDING_P_H
#define QDECLARATIVEBINDING_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 "qdeclarative.h"
#include "qdeclarativepropertyvaluesource.h"
#include "qdeclarativeexpression.h"
#include "qdeclarativeproperty.h"
#include "private/qdeclarativeproperty_p.h"
#include <QtCore/QObject>
#include <QtCore/QMetaProperty>
QT_BEGIN_NAMESPACE
class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeAbstractBinding
{
public:
typedef QWeakPointer<QDeclarativeAbstractBinding> Pointer;
QDeclarativeAbstractBinding();
enum DestroyMode {
// The binding should disconnect itself upon destroy
DisconnectBinding,
// The binding doesn't need to disconnect itself, but it can if it wants to.
//
// This is used in QDeclarativeData::destroyed() - at the point at which the bindings are
// destroyed, the notifiers are already disconnected, so no need to disconnect each
// binding again.
//
// Bindings can use this flag to speed up destruction, especially for compiled bindings
// disconnecting a single binding might be slow.
KeepBindingConnected
};
virtual void destroy(DestroyMode mode = DisconnectBinding);
virtual QString expression() const;
enum DisconnectMode {
// Just this single binding is getting disconnected, other bindings remain connected and
// should not be changed.
DisconnectOne,
// All bindings of the same object are getting disconnected. As an optimization, it is
// therefore valid to disconnect all bindings in one go.
DisconnectAll
};
// disconnectMode can be ignored, it is just a hint for potential optimization
virtual void disconnect(DisconnectMode disconnectMode) = 0;
enum Type { PropertyBinding, ValueTypeProxy };
virtual Type bindingType() const { return PropertyBinding; }
QObject *object() const;
int propertyIndex() const;
void setEnabled(bool e) { setEnabled(e, QDeclarativePropertyPrivate::DontRemoveBinding); }
virtual void setEnabled(bool, QDeclarativePropertyPrivate::WriteFlags) = 0;
void update() { update(QDeclarativePropertyPrivate::DontRemoveBinding); }
virtual void update(QDeclarativePropertyPrivate::WriteFlags) = 0;
void addToObject(QObject *, int);
void removeFromObject();
static Pointer getPointer(QDeclarativeAbstractBinding *p) { return p ? p->weakPointer() : Pointer(); }
protected:
virtual ~QDeclarativeAbstractBinding();
void clear();
private:
Pointer weakPointer();
friend class QDeclarativeData;
friend class QDeclarativeComponentPrivate;
friend class QDeclarativeValueTypeProxyBinding;
friend class QDeclarativePropertyPrivate;
friend class QDeclarativeVME;
friend class QtSharedPointer::ExternalRefCount<QDeclarativeAbstractBinding>;
QObject *m_object;
int m_propertyIndex;
QDeclarativeAbstractBinding **m_mePtr;
QDeclarativeAbstractBinding **m_prevBinding;
QDeclarativeAbstractBinding *m_nextBinding;
QSharedPointer<QDeclarativeAbstractBinding> m_selfPointer;
};
class QDeclarativeValueTypeProxyBinding : public QDeclarativeAbstractBinding
{
public:
QDeclarativeValueTypeProxyBinding(QObject *o, int coreIndex);
virtual Type bindingType() const { return ValueTypeProxy; }
virtual void setEnabled(bool, QDeclarativePropertyPrivate::WriteFlags);
virtual void update(QDeclarativePropertyPrivate::WriteFlags);
virtual void disconnect(DisconnectMode disconnectMode);
QDeclarativeAbstractBinding *binding(int propertyIndex);
void removeBindings(quint32 mask);
protected:
~QDeclarativeValueTypeProxyBinding();
private:
void recursiveEnable(QDeclarativeAbstractBinding *, QDeclarativePropertyPrivate::WriteFlags);
void recursiveDisable(QDeclarativeAbstractBinding *);
friend class QDeclarativeAbstractBinding;
QObject *m_object;
int m_index;
QDeclarativeAbstractBinding *m_bindings;
};
class QDeclarativeContext;
class QDeclarativeBindingPrivate;
class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeBinding : public QDeclarativeExpression, public QDeclarativeAbstractBinding
{
Q_OBJECT
public:
enum EvaluateFlag { RequiresThisObject = 0x01 };
Q_DECLARE_FLAGS(EvaluateFlags, EvaluateFlag)
QDeclarativeBinding(const QString &, QObject *, QDeclarativeContext *, QObject *parent=0);
QDeclarativeBinding(const QString &, QObject *, QDeclarativeContextData *, QObject *parent=0);
QDeclarativeBinding(void *, QDeclarativeRefCount *, QObject *, QDeclarativeContextData *,
const QString &, int, QObject *parent);
QDeclarativeBinding(const QScriptValue &, QObject *, QDeclarativeContextData *, QObject *parent=0);
void setTarget(const QDeclarativeProperty &);
QDeclarativeProperty property() const;
void setEvaluateFlags(EvaluateFlags flags);
EvaluateFlags evaluateFlags() const;
bool enabled() const;
// Inherited from QDeclarativeAbstractBinding
virtual void setEnabled(bool, QDeclarativePropertyPrivate::WriteFlags flags);
virtual void update(QDeclarativePropertyPrivate::WriteFlags flags);
virtual QString expression() const;
virtual void disconnect(DisconnectMode disconnectMode);
typedef int Identifier;
static Identifier Invalid;
static QDeclarativeBinding *createBinding(Identifier, QObject *, QDeclarativeContext *, const QString &, int, QObject *parent=0);
public Q_SLOTS:
void update() { update(QDeclarativePropertyPrivate::DontRemoveBinding); }
protected:
~QDeclarativeBinding();
void emitValueChanged();
private:
Q_DECLARE_PRIVATE(QDeclarativeBinding)
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QDeclarativeBinding::EvaluateFlags)
QT_END_NAMESPACE
Q_DECLARE_METATYPE(QDeclarativeBinding*)
#endif // QDECLARATIVEBINDING_P_H
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