/****************************************************************************
Copyright 2016  Martin Gräßlin <mgraesslin@kde.org>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) version 3, or any
later version accepted by the membership of KDE e.V. (or its
successor approved by the membership of KDE e.V.), which shall
act as a proxy defined in Section 6 of version 3 of the license.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library.  If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
#ifndef KWAYLAND_CLIENT_RELATIVEPOINTER_H
#define KWAYLAND_CLIENT_RELATIVEPOINTER_H

#include <QObject>

#include <KWayland/Client/kwaylandclient_export.h>

struct zwp_relative_pointer_manager_v1;
struct zwp_relative_pointer_v1;

namespace KWayland
{
namespace Client
{

class EventQueue;
class Pointer;
class RelativePointer;

/**
 * @short Wrapper for the zwp_relative_pointer_manager_v1 interface.
 *
 * This class provides a convenient wrapper for the zwp_relative_pointer_manager_v1 interface.
 *
 * To use this class one needs to interact with the Registry. There are two
 * possible ways to create the RelativePointerManager interface:
 * @code
 * RelativePointerManager *c = registry->createRelativePointerManagerUnstableV1(name, version);
 * @endcode
 *
 * This creates the RelativePointerManager and sets it up directly. As an alternative this
 * can also be done in a more low level way:
 * @code
 * RelativePointerManager *c = new RelativePointerManager;
 * c->setup(registry->RelativePointerManager(name, version));
 * @endcode
 *
 * The RelativePointerManager can be used as a drop-in replacement for any zwp_relative_pointer_manager_v1
 * pointer as it provides matching cast operators.
 *
 * @see Registry
 * @since 5.28
 **/
class KWAYLANDCLIENT_EXPORT RelativePointerManager : public QObject
{
    Q_OBJECT
public:
    /**
     * Creates a new RelativePointerManager.
     * Note: after constructing the RelativePointerManager it is not yet valid and one needs
     * to call setup. In order to get a ready to use RelativePointerManager prefer using
     * Registry::createRelativePointerManagerUnstableV1.
     **/
    explicit RelativePointerManager(QObject *parent = nullptr);
    virtual ~RelativePointerManager();

    /**
     * Setup this RelativePointerManagerUnstableV1 to manage the @p relativepointermanagerunstablev1.
     * When using Registry::createRelativePointerManagerUnstableV1 there is no need to call this
     * method.
     **/
    void setup(zwp_relative_pointer_manager_v1 *relativepointermanagerunstablev1);
    /**
     * @returns @c true if managing a zwp_relative_pointer_manager_v1.
     **/
    bool isValid() const;
    /**
     * Releases the zwp_relative_pointer_manager_v1 interface.
     * After the interface has been released the RelativePointerManagerUnstableV1 instance is no
     * longer valid and can be setup with another zwp_relative_pointer_manager_v1 interface.
     **/
    void release();
    /**
     * Destroys the data held by this RelativePointerManagerUnstableV1.
     * This method is supposed to be used when the connection to the Wayland
     * server goes away. If the connection is not valid anymore, it's not
     * possible to call release anymore as that calls into the Wayland
     * connection and the call would fail. This method cleans up the data, so
     * that the instance can be deleted or set up to a new zwp_relative_pointer_manager_v1 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, relativepointermanagerunstablev1, &RelativePointerManagerUnstableV1::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

    /**
     * Sets the @p queue to use for creating objects with this RelativePointerManagerUnstableV1.
     **/
    void setEventQueue(EventQueue *queue);
    /**
     * @returns The event queue to use for creating objects with this RelativePointerManagerUnstableV1.
     **/
    EventQueue *eventQueue();

    /**
     * Creates a RelativePointer for the given @p pointer.
     **/
    RelativePointer *createRelativePointer(Pointer *pointer, QObject *parent = nullptr);

    operator zwp_relative_pointer_manager_v1*();
    operator zwp_relative_pointer_manager_v1*() const;

Q_SIGNALS:
    /**
     * The corresponding global for this interface on the Registry got removed.
     *
     * This signal gets only emitted if the RelativePointerManagerUnstableV1 got created by
     * Registry::createRelativePointerManagerUnstableV1
     **/
    void removed();

private:
    class Private;
    QScopedPointer<Private> d;
};

/**
 * @short Wrapper for the zwp_relative_pointer_v1 interface.
 *
 * The RelativePointer is an extension to the Pointer used for emitting
 * relative pointer events. It shares the same focus as Pointer of the same Seat
 * and will only emit events when it has focus.
 *
 * @since 5.28
 **/
class KWAYLANDCLIENT_EXPORT RelativePointer : public QObject
{
    Q_OBJECT
public:
    virtual ~RelativePointer();

    /**
     * Setup this RelativePointerUnstableV1 to manage the @p relativepointerunstablev1.
     * When using RelativePointerManagerUnstableV1::createRelativePointerUnstableV1 there is no need to call this
     * method.
     **/
    void setup(zwp_relative_pointer_v1 *relativepointerunstablev1);
    /**
     * @returns @c true if managing a zwp_relative_pointer_v1.
     **/
    bool isValid() const;
    /**
     * Releases the zwp_relative_pointer_v1 interface.
     * After the interface has been released the RelativePointerUnstableV1 instance is no
     * longer valid and can be setup with another zwp_relative_pointer_v1 interface.
     **/
    void release();
    /**
     * Destroys the data held by this RelativePointerUnstableV1.
     * This method is supposed to be used when the connection to the Wayland
     * server goes away. If the connection is not valid anymore, it's not
     * possible to call release anymore as that calls into the Wayland
     * connection and the call would fail. This method cleans up the data, so
     * that the instance can be deleted or set up to a new zwp_relative_pointer_v1 interface
     * once there is a new connection available.
     *
     * This method is automatically invoked when the Registry which created this
     * RelativePointer gets destroyed.
     *
     * @see release
     **/
    void destroy();

    operator zwp_relative_pointer_v1*();
    operator zwp_relative_pointer_v1*() const;

Q_SIGNALS:
    /**
     * A relative motion event.
     *
     * A relative motion is in the same dimension as regular motion events,
     * except they do not represent an absolute position. For example,
     * moving a pointer from (x, y) to (x', y') would have the equivalent
     * relative motion (x' - x, y' - y). If a pointer motion caused the
     * absolute pointer position to be clipped by for example the edge of the
     * monitor, the relative motion is unaffected by the clipping and will
     * represent the unclipped motion.
     *
     * This signal also contains non-accelerated motion deltas (@p deltaNonAccelerated).
     * The non-accelerated delta is, when applicable, the regular pointer motion
     * delta as it was before having applied motion acceleration and other
     * transformations such as normalization.
     *
     * Note that the non-accelerated delta does not represent 'raw' events as
     * they were read from some device. Pointer motion acceleration is device-
     * and configuration-specific and non-accelerated deltas and accelerated
     * deltas may have the same value on some devices.
     *
     * Relative motions are not coupled to Pointer motion events,
     * and can be sent in combination with such events, but also independently. There may
     * also be scenarios where Pointer motion is sent, but there is no
     * relative motion. The order of an absolute and relative motion event
     * originating from the same physical motion is not guaranteed.
     *
     * @param delta Motion vector
     * @param deltaNonAccelerated non-accelerated motion vector
     * @param microseconds timestamp with microseconds granularity
     **/
    void relativeMotion(const QSizeF &delta, const QSizeF &deltaNonAccelerated, quint64 timestamp);

private:
    friend class RelativePointerManager;
    explicit RelativePointer(QObject *parent = nullptr);
    class Private;
    QScopedPointer<Private> d;
};


}
}

#endif
