/****************************************************************************
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_POINTERGESTURES_H
#define KWAYLAND_CLIENT_POINTERGESTURES_H

#include <QObject>
#include <QPointer>

#include <KWayland/Client/kwaylandclient_export.h>

struct zwp_pointer_gestures_v1;
struct zwp_pointer_gesture_swipe_v1;
struct zwp_pointer_gesture_pinch_v1;

class QSizeF;

namespace KWayland
{
namespace Client
{

class EventQueue;
class PointerPinchGesture;
class Pointer;
class Surface;
class PointerSwipeGesture;

/**
 * @short Wrapper for the zwp_pointer_gestures_v1 interface.
 *
 * This class provides a convenient wrapper for the zwp_pointer_gestures_v1 interface.
 *
 * To use this class one needs to interact with the Registry. There are two
 * possible ways to create the PointerGestures interface:
 * @code
 * PointerGestures *c = registry->createPointerGestures(name, version);
 * @endcode
 *
 * This creates the PointerGestures and sets it up directly. As an alternative this
 * can also be done in a more low level way:
 * @code
 * PointerGestures *c = new PointerGestures;
 * c->setup(registry->bindPointerGestures(name, version));
 * @endcode
 *
 * The PointerGestures can be used as a drop-in replacement for any zwp_pointer_gestures_v1
 * pointer as it provides matching cast operators.
 *
 * @see Registry
 * @see PointerSwipeGesture
 * @see PointerPinchGesture
 * @since 5.29
 **/
class KWAYLANDCLIENT_EXPORT PointerGestures : public QObject
{
    Q_OBJECT
public:
    /**
     * Creates a new PointerGestures.
     * Note: after constructing the PointerGestures it is not yet valid and one needs
     * to call setup. In order to get a ready to use PointerGestures prefer using
     * Registry::createPointerGestures.
     **/
    explicit PointerGestures(QObject *parent = nullptr);
    virtual ~PointerGestures();

    /**
     * Setup this PointerGestures to manage the @p pointergestures.
     * When using Registry::createPointerGestures there is no need to call this
     * method.
     **/
    void setup(zwp_pointer_gestures_v1 *pointergestures);
    /**
     * @returns @c true if managing a zwp_pointer_gestures_v1.
     **/
    bool isValid() const;
    /**
     * Releases the zwp_pointer_gestures_v1 interface.
     * After the interface has been released the PointerGestures instance is no
     * longer valid and can be setup with another zwp_pointer_gestures_v1 interface.
     **/
    void release();
    /**
     * Destroys the data held by this PointerGestures.
     * 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_pointer_gestures_v1 interface
     * once there is a new connection available.
     *
     * This method is automatically invoked when the Registry which created this
     * PointerGestures gets destroyed.
     * @endcode
     *
     * @see release
     **/
    void destroy();

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

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

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

    operator zwp_pointer_gestures_v1*();
    operator zwp_pointer_gestures_v1*() const;

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

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

/**
 * This class is a wrapper for the zwp_pointer_gesture_swipe_v1 protocol.
 *
 * A PointerSwipeGesture object notifies a client about a multi-finger swipe
 * gesture detected on an indirect input device such as a touchpad.
 * The gesture is usually initiated by multiple fingers moving in the
 * same direction but once initiated the direction may change.
 * The precise conditions of when such a gesture is detected are
 * implementation-dependent.
 *
 * A gesture consists of three stages: begin, update (optional) and end.
 * There cannot be multiple simultaneous pinch or swipe gestures on the
 * same pointer/seat, how compositors prevent these situations is
 * implementation-dependent.
 *
 * A gesture may be cancelled by the compositor or the hardware.
 * Clients should not consider performing permanent or irreversible
 * actions until the end of a gesture has been received.
 *
 * @see PointerGestures
 * @see PointerPinchGesture
 * @since 5.29
 **/
class KWAYLANDCLIENT_EXPORT PointerSwipeGesture : public QObject
{
    Q_OBJECT
public:
    virtual ~PointerSwipeGesture();

    /**
     * Setup this PointerSwipeGesture to manage the @p pointerswipegesture.
     * When using PointerGestures::createPointerSwipeGesture there is no need to call this
     * method.
     **/
    void setup(zwp_pointer_gesture_swipe_v1 *pointerswipegesture);
    /**
     * @returns @c true if managing a zwp_pointer_gesture_swipe_v1.
     **/
    bool isValid() const;
    /**
     * Releases the zwp_pointer_gesture_swipe_v1 interface.
     * After the interface has been released the PointerSwipeGesture instance is no
     * longer valid and can be setup with another zwp_pointer_gesture_swipe_v1 interface.
     **/
    void release();
    /**
     * Destroys the data held by this PointerSwipeGesture.
     * 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_pointer_gesture_swipe_v1 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, pointerswipegesture, &PointerSwipeGesture::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

    /**
     * The number of fingers taking part in this gesture.
     * If no gesture is in progress @c 0 is returned.
     **/
    quint32 fingerCount() const;

    /**
     * The Surface on which this gesture is performed.
     * If no gesture is in progress the returned pointer is null.
     **/
    QPointer<Surface> surface() const;

    operator zwp_pointer_gesture_swipe_v1*();
    operator zwp_pointer_gesture_swipe_v1*() const;

Q_SIGNALS:
    /**
     * A gesture got started.
     * @param serial Unique serial for this start gesture event.
     * @param time Timestamp in milliseconds granularity
     * @see updated
     * @see ended
     * @see cancelled
     **/
    void started(quint32 serial, quint32 time);

    /**
     * A gesture got updated.
     * @param delta relative coordinates of the logical center of the gesture compared to the previous event
     * @param time Timestamp in milliseconds granularity
     * @see started
     * @see ended
     * @see cancelled
     **/
    void updated(const QSizeF &delta, quint32 time);

    /**
     * A gesture ended.
     *
     * @param serial Unique serial for this end gesture event.
     * @param time Timestamp in milliseconds granularity
     * @see started
     * @see updated
     * @see cancelled
     **/
    void ended(quint32 serial, quint32 time);

    /**
     * A gesture got cancelled by the Wayland compositor.
     *
     * @param serial Unique serial for this cancel gesture event.
     * @param time Timestamp in milliseconds granularity
     * @see started
     * @see updated
     * @see ended
     **/
    void cancelled(quint32 serial, quint32 time);

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

/**
 * This class is a wrapper for the zwp_pointer_gesture_pinch_v1 protocol.
 *
 * A PointerPinchGesture object notifies a client about a multi-finger pinch
 * gesture detected on an indirect input device such as a touchpad.
 * The gesture is usually initiated by multiple fingers moving towards
 * each other or away from each other, or by two or more fingers rotating
 * around a logical center of gravity. The precise conditions of when
 * such a gesture is detected are implementation-dependent.
 *
 * A gesture consists of three stages: begin, update (optional) and end.
 * There cannot be multiple simultaneous pinch or swipe gestures on the
 * same pointer/seat, how compositors prevent these situations is
 * implementation-dependent.
 *
 * A gesture may be cancelled by the compositor or the hardware.
 * Clients should not consider performing permanent or irreversible
 * actions until the end of a gesture has been received.
 *
 * @see PointerGestures
 * @see PointerSwipeGesture
 * @since 5.29
 **/
class KWAYLANDCLIENT_EXPORT PointerPinchGesture : public QObject
{
    Q_OBJECT
public:
    virtual ~PointerPinchGesture();

    /**
     * Setup this PointerPinchGesture to manage the @p pointerpinchgesture.
     * When using PointerGestures::createPointerPinchGesture there is no need to call this
     * method.
     **/
    void setup(zwp_pointer_gesture_pinch_v1 *pointerpinchgesture);
    /**
     * @returns @c true if managing a zwp_pointer_gesture_pinch_v1.
     **/
    bool isValid() const;
    /**
     * Releases the zwp_pointer_gesture_pinch_v1 interface.
     * After the interface has been released the PointerPinchGesture instance is no
     * longer valid and can be setup with another zwp_pointer_gesture_pinch_v1 interface.
     **/
    void release();
    /**
     * Destroys the data held by this PointerPinchGesture.
     * 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_pointer_gesture_pinch_v1 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, pointerpinchgesture, &PointerPinchGesture::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

    /**
     * The number of fingers taking part in this gesture.
     * If no gesture is in progress @c 0 is returned.
     **/
    quint32 fingerCount() const;

    /**
     * The Surface on which this gesture is performed.
     * If no gesture is in progress the returned pointer is null.
     **/
    QPointer<Surface> surface() const;

    operator zwp_pointer_gesture_pinch_v1*();
    operator zwp_pointer_gesture_pinch_v1*() const;

Q_SIGNALS:
    /**
     * A gesture got started.
     * @param serial Unique serial for this start gesture event.
     * @param time Timestamp in milliseconds granularity
     * @see updated
     * @see ended
     * @see cancelled
     **/
    void started(quint32 serial, quint32 time);

    /**
     * A gesture got updated.
     * @param delta relative coordinates of the logical center of the gesture compared to the previous event
     * @param scale an absolute scale compared to the start
     * @param rotation relative angle in degrees clockwise compared to the previous start or update event.
     * @param time Timestamp in milliseconds granularity
     * @see started
     * @see ended
     * @see cancelled
     **/
    void updated(const QSizeF &delta, qreal scale, qreal rotation, quint32 time);

    /**
     * A gesture ended.
     *
     * @param serial Unique serial for this end gesture event.
     * @param time Timestamp in milliseconds granularity
     * @see started
     * @see updated
     * @see cancelled
     **/
    void ended(quint32 serial, quint32 time);

    /**
     * A gesture got cancelled by the Wayland compositor.
     *
     * @param serial Unique serial for this cancel gesture event.
     * @param time Timestamp in milliseconds granularity
     * @see started
     * @see updated
     * @see ended
     **/
    void cancelled(quint32 serial, quint32 time);

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


}
}

#endif
