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****************************************************************************/
#ifndef QWINDOWSYSTEMINTERFACE_H
#define QWINDOWSYSTEMINTERFACE_H

#include <QtCore/QTime>
#include <QtGui/qwindowdefs.h>
#include <QtCore/QEvent>
#include <QtGui/QWidget>
#include <QtCore/QWeakPointer>
#include <QtCore/QMutex>
#include <QtGui/QTouchEvent>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Gui)

class Q_GUI_EXPORT QWindowSystemInterface
{
public:
    static void handleMouseEvent(QWidget *w, const QPoint & local, const QPoint & global, Qt::MouseButtons b) {
        handleMouseEvent(w, eventTime.elapsed(), local, global, b);
    }

    static void handleMouseEvent(QWidget *w, ulong timestamp, const QPoint & local, const QPoint & global, Qt::MouseButtons b);

    static void handleKeyEvent(QWidget *w, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text = QString(), bool autorep = false, ushort count = 1) {
        handleKeyEvent(w, eventTime.elapsed(), t, k, mods, text, autorep, count);
    }

    static void handleKeyEvent(QWidget *w, ulong timestamp, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text = QString(), bool autorep = false, ushort count = 1);

    static void handleWheelEvent(QWidget *w, const QPoint & local, const QPoint & global, int d, Qt::Orientation o) {
        handleWheelEvent(w, eventTime.elapsed(), local, global, d, o);
    }

    static void handleWheelEvent(QWidget *w, ulong timestamp, const QPoint & local, const QPoint & global, int d, Qt::Orientation o);

    struct TouchPoint {
        int id;                 // for application use
        bool isPrimary;         // for application use
        QPointF normalPosition; // touch device coordinates, (0 to 1, 0 to 1)
        QRectF area;            // the touched area, centered at position in screen coordinates
        qreal pressure;         // 0 to 1
        Qt::TouchPointStates state; //Qt::TouchPoint{Pressed|Moved|Stationary|Released}
    };

    static void handleTouchEvent(QWidget *w, QEvent::Type type, QTouchEvent::DeviceType devType, const QList<struct TouchPoint> &points) {
        handleTouchEvent(w, eventTime.elapsed(), type, devType, points);
    }

    static void handleTouchEvent(QWidget *w, ulong timestamp, QEvent::Type type, QTouchEvent::DeviceType devType, const QList<struct TouchPoint> &points);

    // delivered directly by the plugin via spontaneous events
    static void handleGeometryChange(QWidget *w, const QRect &newRect);
    static void handleCloseEvent(QWidget *w);
    static void handleEnterEvent(QWidget *w);
    static void handleLeaveEvent(QWidget *w);

    // Changes to the screen
    static void handleScreenGeometryChange(int screenIndex);
    static void handleScreenAvailableGeometryChange(int screenIndex);
    static void handleScreenCountChange(int count);

    class UserEvent {
    public:
        UserEvent(QWidget * w, ulong time, QEvent::Type t)
            { widget = QWeakPointer<QWidget>(w); type = t; timestamp = time; }
        QWeakPointer<QWidget> widget;
        QEvent::Type type;
        unsigned long timestamp;
    };

    class MouseEvent : public UserEvent {
    public:
        MouseEvent(QWidget * w, ulong time, const QPoint & local, const QPoint & global, Qt::MouseButtons b)
            : UserEvent(w, time, QEvent::MouseMove){ localPos = local; globalPos = global; buttons = b; }
        QPoint localPos;
        QPoint globalPos;
        Qt::MouseButtons buttons;
    };

    class WheelEvent : public UserEvent {
    public:
        WheelEvent(QWidget *w, ulong time, const QPoint & local, const QPoint & global, int d, Qt::Orientation o)
            : UserEvent(w, time, QEvent::Wheel) { localPos = local; globalPos = global; delta = d; orient = o; }
        int delta;
        QPoint localPos;
        QPoint globalPos;
        Qt::Orientation orient;
    };

    class KeyEvent : public UserEvent {
    public:
        KeyEvent(QWidget *w, ulong time, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text = QString(), bool autorep = false, ushort count = 1)
            :UserEvent(w, time, t){ key = k; unicode = text; repeat = autorep; repeatCount = count; modifiers = mods; }
        int key;
        QString unicode;
        bool repeat;
        ushort repeatCount;
        Qt::KeyboardModifiers modifiers;
    };

    class TouchEvent : public UserEvent {
    public:
        TouchEvent(QWidget *w, ulong time, QEvent::Type t, QTouchEvent::DeviceType d, const QList<QTouchEvent::TouchPoint> &p)
            :UserEvent(w, time, t) { devType = d; points = p; }
        QTouchEvent::DeviceType devType;
        QList<QTouchEvent::TouchPoint> points;
    };

private:
    static QTime eventTime;

};

class QWindowSystemInterfacePrivate {
public:
    static QList<QWindowSystemInterface::UserEvent *> userEventQueue;
    static QMutex queueMutex;

    static int userEventsQueued() { queueMutex.lock(); int ret = userEventQueue.count(); queueMutex.unlock(); return ret; }
    static QWindowSystemInterface::UserEvent * getUserEvent();
    static void queueUserEvent(QWindowSystemInterface::UserEvent *ev);
};

QT_END_NAMESPACE
QT_END_HEADER
#endif // QWINDOWSYSTEMINTERFACE_H