/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the plugins 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 Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
** rights.  These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QWINDOWSCLIPBOARD_H
#define QWINDOWSCLIPBOARD_H

#include "qwindowsinternalmimedata.h"

#include <qpa/qplatformclipboard.h>

QT_BEGIN_NAMESPACE

class QWindowsOleDataObject;

class QWindowsClipboardRetrievalMimeData : public QWindowsInternalMimeData {
public:

protected:
    virtual IDataObject *retrieveDataObject() const;
    virtual void releaseDataObject(IDataObject *) const;
};

class QWindowsClipboard : public QPlatformClipboard
{
public:
    QWindowsClipboard();
    ~QWindowsClipboard();
    void registerViewer(); // Call in initialization, when context is up.

    virtual QMimeData *mimeData(QClipboard::Mode mode = QClipboard::Clipboard);
    virtual void setMimeData(QMimeData *data, QClipboard::Mode mode = QClipboard::Clipboard);
    virtual bool supportsMode(QClipboard::Mode mode) const;
    virtual bool ownsMode(QClipboard::Mode mode) const;

    inline bool clipboardViewerWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam, LRESULT *result);

    static QWindowsClipboard *instance() { return m_instance; }

private:
    void clear();
    void releaseIData();
    inline void propagateClipboardMessage(UINT message, WPARAM wParam, LPARAM lParam) const;
    inline void unregisterViewer();
    inline bool ownsClipboard() const;

    static QWindowsClipboard *m_instance;

    QWindowsClipboardRetrievalMimeData m_retrievalData;
    QWindowsOleDataObject *m_data;
    HWND m_clipboardViewer;
    HWND m_nextClipboardViewer;
};

QT_END_NAMESPACE

#endif // QWINDOWSCLIPBOARD_H