/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the plugins of the Qt Toolkit.
**
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** 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
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****************************************************************************/

#ifndef QWINDOWSMOUSEHANDLER_H
#define QWINDOWSMOUSEHANDLER_H

#include "qtwindowsglobal.h"
#include "qtwindows_additional.h"

#include <QtCore/QPointer>
#include <QtCore/QHash>

QT_BEGIN_NAMESPACE

class QWindow;
class QTouchDevice;

class QWindowsMouseHandler
{
    Q_DISABLE_COPY(QWindowsMouseHandler)
public:
    QWindowsMouseHandler();

    bool translateMouseEvent(QWindow *widget, HWND hwnd,
                             QtWindows::WindowsEventType t, MSG msg,
                             LRESULT *result);
    bool translateTouchEvent(QWindow *widget, HWND hwnd,
                             QtWindows::WindowsEventType t, MSG msg,
                             LRESULT *result);

    static inline Qt::MouseButtons keyStateToMouseButtons(int);
    static inline Qt::KeyboardModifiers keyStateToModifiers(int);
    static inline int mouseButtonsToKeyState(Qt::MouseButtons);

    static Qt::MouseButtons queryMouseButtons();
    QWindow *windowUnderMouse() const { return m_windowUnderMouse.data(); }

private:
    inline bool translateMouseWheelEvent(QWindow *window, HWND hwnd,
                                         MSG msg, LRESULT *result);

    QPointer<QWindow> m_windowUnderMouse;
    QPointer<QWindow> m_trackedWindow;
    QHash<DWORD, int> m_touchInputIDToTouchPointID;
    QHash<int, QPointF> m_lastTouchPositions;
    QTouchDevice *m_touchDevice;
    bool m_leftButtonDown;
    QWindow *m_previousCaptureWindow;
};

Qt::MouseButtons QWindowsMouseHandler::keyStateToMouseButtons(int wParam)
{
    Qt::MouseButtons mb(Qt::NoButton);
    if (wParam & MK_LBUTTON)
        mb |= Qt::LeftButton;
    if (wParam & MK_MBUTTON)
        mb |= Qt::MiddleButton;
    if (wParam & MK_RBUTTON)
        mb |= Qt::RightButton;
    if (wParam & MK_XBUTTON1)
        mb |= Qt::XButton1;
    if (wParam & MK_XBUTTON2)
        mb |= Qt::XButton2;
    return mb;
}

Qt::KeyboardModifiers QWindowsMouseHandler::keyStateToModifiers(int wParam)
{
    Qt::KeyboardModifiers mods(Qt::NoModifier);
    if (wParam & MK_CONTROL)
      mods |= Qt::ControlModifier;
    if (wParam & MK_SHIFT)
      mods |= Qt::ShiftModifier;
    return mods;
}

int QWindowsMouseHandler::mouseButtonsToKeyState(Qt::MouseButtons mb)
{
    int result = 0;
    if (mb & Qt::LeftButton)
        result |= MK_LBUTTON;
    if (mb & Qt::MiddleButton)
        result |= MK_MBUTTON;
    if (mb & Qt::RightButton)
        result |= MK_RBUTTON;
    if (mb & Qt::XButton1)
        result |= MK_XBUTTON1;
    if (mb & Qt::XButton2)
        result |= MK_XBUTTON2;
    return result;
}

QT_END_NAMESPACE

#endif // QWINDOWSMOUSEHANDLER_H
