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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 QQMLDELAYEDCALLQUEUE_P_H
#define QQMLDELAYEDCALLQUEUE_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/qglobal.h>
#include <QtCore/qobject.h>
#include <QtCore/qmetaobject.h>
#include <QtCore/qmetatype.h>
#include <private/qqmlguard_p.h>
#include <private/qv4context_p.h>

QT_BEGIN_NAMESPACE

class QV8Engine;
class QQmlDelayedCallQueue : public QObject
{
    Q_OBJECT
public:
    QQmlDelayedCallQueue();
    ~QQmlDelayedCallQueue();

    void init(QV4::ExecutionEngine *);

    QV4::ReturnedValue addUniquelyAndExecuteLater(QV4::CallContext *ctx);

public Q_SLOTS:
    void ticked();

private:
    struct DelayedFunctionCall
    {
        DelayedFunctionCall() {}
        DelayedFunctionCall(QV4::PersistentValue function)
            : m_function(function), m_guarded(false) { }

        void execute(QV4::ExecutionEngine *engine) const;

        QV4::PersistentValue m_function;
        QV4::PersistentValue m_args;
        QQmlGuard<QObject> m_objectGuard;
        bool m_guarded;
    };

    void storeAnyArguments(DelayedFunctionCall& dfc, const QV4::CallData *callData, int offset, QV4::ExecutionEngine *engine);
    void executeAllExpired_Later();

    QV4::ExecutionEngine *m_engine;
    QVector<DelayedFunctionCall> m_delayedFunctionCalls;
    QMetaMethod m_tickedMethod;
    bool m_callbackOutstanding;
};

QT_END_NAMESPACE

#endif // QQMLDELAYEDCALLQUEUE_P_H