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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 QtGui 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 QSIMPLEDRAG_H
#define QSIMPLEDRAG_H

#include <qpa/qplatformdrag.h>

#include <QtCore/QObject>

QT_BEGIN_NAMESPACE

QT_BEGIN_HEADER

#ifndef QT_NO_DRAGANDDROP

class QMouseEvent;
class QWindow;
class QEventLoop;
class QDropData;
class QShapedPixmapWindow;

class QBasicDrag : public QPlatformDrag, public QObject
{
public:
    virtual ~QBasicDrag();

    virtual Qt::DropAction drag(QDrag *drag);

    virtual bool eventFilter(QObject *o, QEvent *e);

protected:
    QBasicDrag();

    virtual void startDrag();
    virtual void cancel();
    virtual void move(const QMouseEvent *me);
    virtual void drop(const QMouseEvent *me);
    virtual void endDrag();

    QShapedPixmapWindow *shapedPixmapWindow() const { return m_drag_icon_window; }
    void updateCursor(Qt::DropAction action);

    bool canDrop() const { return m_can_drop; }
    void setCanDrop(bool c) { m_can_drop = c; }

    Qt::DropAction executedDropAction() const { return m_executed_drop_action; }
    void  setExecutedDropAction(Qt::DropAction da) { m_executed_drop_action = da; }

    QDrag *drag() const { return m_drag; }

private:
    void enableEventFilter();
    void disableEventFilter();
    void resetDndState(bool deleteSource);
    void exitDndEventLoop();

    bool m_restoreCursor;
    QEventLoop *m_eventLoop;
    Qt::DropAction m_executed_drop_action;
    bool m_can_drop;
    QDrag *m_drag;
    QShapedPixmapWindow *m_drag_icon_window;
    Qt::DropAction m_cursor_drop_action;
};

class QSimpleDrag : public QBasicDrag
{
public:
    QSimpleDrag();
    virtual QMimeData *platformDropData();

protected:
    virtual void startDrag();
    virtual void cancel();
    virtual void move(const QMouseEvent *me);
    virtual void drop(const QMouseEvent *me);

private:
    QWindow *m_current_window;
};

#endif // QT_NO_DRAGANDDROP

QT_END_HEADER

QT_END_NAMESPACE

#endif