File indexing completed on 2024-12-08 04:57:28

 /*
     SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
     SPDX-FileCopyrightText: 2021 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 #pragma once
 
 #include "kwin_export.h"
 
 #include <QMatrix4x4>
 #include <QObject>
 #include <QPoint>
 
 struct wl_client;
 struct wl_resource;
 
 namespace KWin
 {
 class AbstractDataSource;
 class AbstractDropHandler;
 class DragAndDropIcon;
 class DataDeviceInterface;
 class Display;
 class KeyboardInterface;
 class PointerInterface;
 class SeatInterfacePrivate;
 class SurfaceInterface;
 class TextInputV1Interface;
 class TextInputV2Interface;
 class TextInputV3Interface;
 class TouchInterface;
 class XdgToplevelDragV1Interface;
 
 /**
  * Describes the source types for axis events. This indicates to the
  * client how an axis event was physically generated; a client may
  * adjust the user interface accordingly. For example, scroll events
  * from a "finger" source may be in a smooth coordinate space with
  * kinetic scrolling whereas a "wheel" source may be in discrete steps
  * of a number of lines.
  *
  * The "continuous" axis source is a device generating events in a
  * continuous coordinate space, but using something other than a
  * finger. One example for this source is button-based scrolling where
  * the vertical motion of a device is converted to scroll events while
  * a button is held down.
  *
  * The "wheel tilt" axis source indicates that the actual device is a
  * wheel but the scroll event is not caused by a rotation but a
  * (usually sideways) tilt of the wheel.
  */
 enum class PointerAxisSource {
     Unknown,
     Wheel,
     Finger,
     Continuous,
     WheelTilt,
 };
 
 /**
  * Maps to wl_pointer.axis_relative_direction. Currently used for y axis only
  */
 enum class PointerAxisRelativeDirection {
     Normal,
     Inverted
 };
 
 /**
  * This enum type is used to describe the state of a pointer button. It
  * is equivalent to the @c wl_pointer.button_state enum.
  */
 enum class PointerButtonState : quint32 {
     Released = 0,
     Pressed = 1,
 };
 
 /**
  * This enum type is used to describe the state of a keyboard key. It is
  * equivalent to the @c wl_keyboard.key_state enum.
  */
 enum class KeyboardKeyState : quint32 {
     Released = 0,
     Pressed = 1,
 };
 
 /**
  * @brief Represents a Seat on the Wayland Display.
  *
  * A Seat is a set of input devices (e.g. Keyboard, Pointer and Touch) the client can connect
  * to. The server needs to announce which input devices are supported and passes dedicated input
  * focus to a SurfaceInterface. Only the focused surface receives input events.
  *
  * The SeatInterface internally handles enter and release events when setting a focused surface.
  * Also it handles input translation from global to the local coordination, removing the need from
  * the user of the API to track the focused surfaces and can just interact with this class.
  *
  * To create a SeatInterface use @link Display::createSeat @endlink. Then one can set up what is
  * supported. Last but not least create needs to be called.
  *
  * @code
  * SeatInterface *seat = display->createSeat();
  * // set up
  * seat->setName(QStringLiteral("seat0"));
  * seat->setHasPointer(true);
  * seat->setHasKeyboard(true);
  * seat->setHasTouch(false);
  * // now fully create
  * seat->create();
  * @endcode
  *
  * To forward input events one needs to set the focused surface, update time stamp and then
  * forward the actual events:
  *
  * @code
  * // example for pointer
  * seat->setTimestamp(100);
  * seat->notifyPointerEnter(surface, QPointF(350, 210), QPointF(100, 200)); // surface at it's global position
  * seat->notifyPointerFrame();
  * seat->setTimestamp(110);
  * seat->notifyPointerButton(Qt::LeftButton, PointerButtonState::Pressed);
  * seat->notifyPointerFrame();
  * seat->setTimestamp(120);
  * seat->notifyPointerButton(Qt::LeftButton, PointerButtonState::Released);
  * seat->notifyPointerFrame();
  * @endcode
  *
  * @see KeyboardInterface
  * @see PointerInterface
  * @see TouchInterface
  * @see SurfaceInterface
  */
 class KWIN_EXPORT SeatInterface : public QObject
 {
     Q_OBJECT
 public:
     explicit SeatInterface(Display *display, QObject *parent = nullptr);
     virtual ~SeatInterface();
 
     Display *display() const;
     QString name() const;
     bool hasPointer() const;
     bool hasKeyboard() const;
     bool hasTouch() const;
 
     void setName(const QString &name);
     void setHasPointer(bool has);
     void setHasKeyboard(bool has);
     void setHasTouch(bool has);
 
     void setTimestamp(std::chrono::microseconds time);
     std::chrono::milliseconds timestamp() const;
 
     /**
      * @name Drag'n'Drop related methods
      */
     ///@{
     /**
      * @returns whether there is currently a drag'n'drop going on.
      * @see isDragPointer
      * @see isDragTouch
      * @see dragStarted
      * @see dragEnded
      */
     bool isDrag() const;
     /**
      * @returns whether the drag'n'drop is operated through the pointer device
      * @see isDrag
      * @see isDragTouch
      */
     bool isDragPointer() const;
     /**
      * @returns whether the drag'n'drop is operated through the touch device
      * @see isDrag
      * @see isDragPointer
      */
     bool isDragTouch() const;
     /**
      * @returns The transformation applied to go from global to local coordinates for drag motion events.
      * @see dragSurfaceTransformation
      */
     QMatrix4x4 dragSurfaceTransformation() const;
     /**
      * @returns The currently focused Surface for drag motion events.
      * @see dragSurfaceTransformation
      * @see dragSurfaceChanged
      */
     SurfaceInterface *dragSurface() const;
     /**
      * @returns The DataDeviceInterface which started the drag and drop operation.
      * @see isDrag
      */
     AbstractDataSource *dragSource() const;
     /**
      * @returns the toplevel drag if the current drag is a toplevel drag
      */
     XdgToplevelDragV1Interface *xdgTopleveldrag() const;
 
     /**
      * Sets the current drag target to @p surface.
      *
      * Sends a drag leave event to the current target and an enter event to @p surface.
      * The enter position is derived from @p globalPosition and transformed by @p inputTransformation.
      */
     void setDragTarget(AbstractDropHandler *dropTarget, SurfaceInterface *surface, const QPointF &globalPosition, const QMatrix4x4 &inputTransformation);
     /**
      * Sets the current drag target to @p surface.
      *
      * Sends a drag leave event to the current target and an enter event to @p surface.
      * The enter position is derived from current global position and transformed by @p inputTransformation.
      */
     void setDragTarget(AbstractDropHandler *dropTarget, SurfaceInterface *surface, const QMatrix4x4 &inputTransformation = QMatrix4x4());
     ///@}
 
     AbstractDropHandler *dropHandlerForSurface(SurfaceInterface *surface) const;
 
     /**
      * If there is a current drag in progress, force it to cancel
      */
     void cancelDrag();
 
     /**
      * @name Pointer related methods
      */
     ///@{
     /**
      * Updates the global pointer @p pos.
      *
      * Sends a pointer motion event to the focused pointer surface.
      */
     void notifyPointerMotion(const QPointF &pos);
     /**
      * @returns the global pointer position
      */
     QPointF pointerPos() const;
     /**
      * Sets the focused pointer @p surface.
      * All pointer events will be sent to the @p surface till a new focused pointer surface gets
      * installed. When the focus pointer surface changes a leave event is sent to the previous
      * focused surface.
      *
      * To unset the focused pointer surface pass @c nullptr as @p surface.
      *
      * Pointer motion events are adjusted to the local position based on the @p surfacePosition.
      * If the surface changes it's position in the global coordinate system
      * use setFocusedPointerSurfacePosition to update.
      * The surface position is used to create the base transformation matrix to go from global
      * to surface local coordinates. The default generated matrix is a translation with
      * negative @p surfacePosition.
      *
      * @param surface The surface which should become the new focused pointer surface.
      * @param surfacePosition The position of the surface in the global coordinate system
      *
      * @see setPointerPos
      * @see focucedPointerSurface
      * @see focusedPointer
      * @see setFocusedPointerSurfacePosition
      * @see focusedPointerSurfacePosition
      * @see setFocusedPointerSurfaceTransformation
      * @see focusedPointerSurfaceTransformation
      */
     void notifyPointerEnter(SurfaceInterface *surface, const QPointF &position, const QPointF &surfacePosition = QPointF());
     /**
      * Sets the focused pointer @p surface.
      * All pointer events will be sent to the @p surface till a new focused pointer surface gets
      * installed. When the focus pointer surface changes a leave event is sent to the previous
      * focused surface.
      *
      * To unset the focused pointer surface pass @c nullptr as @p surface.
      *
      * Pointer motion events are adjusted to the local position based on the @p transformation.
      * If the surface changes it's position in the global coordinate system
      * use setFocusedPointerSurfaceTransformation to update.
      *
      * @param surface The surface which should become the new focused pointer surface.
      * @param transformation The transformation to transform global into local coordinates
      *
      * @see setPointerPos
      * @see focucedPointerSurface
      * @see focusedPointer
      * @see setFocusedPointerSurfacePosition
      * @see focusedPointerSurfacePosition
      * @see setFocusedPointerSurfaceTransformation
      * @see focusedPointerSurfaceTransformation
      */
     void notifyPointerEnter(SurfaceInterface *surface, const QPointF &position, const QMatrix4x4 &transformation);
     void notifyPointerLeave();
     /**
      * @returns The currently focused pointer surface, that is the surface receiving pointer events.
      * @see notifyPointerEnter
      * @see notifyPointerLeave
      */
     SurfaceInterface *focusedPointerSurface() const;
     PointerInterface *pointer() const;
     /**
      * Updates the global position of the currently focused pointer surface.
      *
      * Updating the focused surface position also generates a new transformation matrix.
      * The default generated matrix is a translation with negative @p surfacePosition.
      * If a different transformation is required a dedicated call to
      * @link setFocusedPointerSurfaceTransformation is required.
      *
      * @param surfacePosition The new global position of the focused pointer surface
      * @see focusedPointerSurface
      * @see focusedPointerSurfaceTransformation
      * @see setFocusedPointerSurfaceTransformation
      */
     void setFocusedPointerSurfacePosition(const QPointF &surfacePosition);
     /**
      * @returns The position of the focused pointer surface in global coordinates.
      * @see setFocusedPointerSurfacePosition
      * @see focusedPointerSurfaceTransformation
      */
     QPointF focusedPointerSurfacePosition() const;
     /**
      * Sets the @p transformation for going from global to local coordinates.
      *
      * The default transformation gets generated from the surface position and reset whenever
      * the surface position changes.
      *
      * @see focusedPointerSurfaceTransformation
      * @see focusedPointerSurfacePosition
      * @see setFocusedPointerSurfacePosition
      */
     void setFocusedPointerSurfaceTransformation(const QMatrix4x4 &transformation);
     /**
      * @returns The transformation applied to pointer position to go from global to local coordinates.
      * @see setFocusedPointerSurfaceTransformation
      */
     QMatrix4x4 focusedPointerSurfaceTransformation() const;
     /**
      * Marks the specified @a button as pressed or released based on @a state.
      */
     void notifyPointerButton(quint32 button, PointerButtonState state);
     /**
      * @overload
      */
     void notifyPointerButton(Qt::MouseButton button, PointerButtonState state);
     void notifyPointerFrame();
     /**
      * @returns whether the @p button is pressed
      */
     bool isPointerButtonPressed(quint32 button) const;
     /**
      * @returns whether the @p button is pressed
      */
     bool isPointerButtonPressed(Qt::MouseButton button) const;
     /**
      * @returns the last serial for @p button.
      */
     quint32 pointerButtonSerial(quint32 button) const;
     /**
      * @returns the last serial for @p button.
      */
     quint32 pointerButtonSerial(Qt::MouseButton button) const;
     /**
      * Sends axis events to the currently focused pointer surface.
      *
      * @param orientation The scroll axis.
      * @param delta The length of a vector along the specified axis @p orientation.
      * @param deltaV120 The high-resolution scrolling axis value.
      * @param source Describes how the axis event was physically generated.
      */
     void notifyPointerAxis(Qt::Orientation orientation, qreal delta, qint32 deltaV120, PointerAxisSource source, PointerAxisRelativeDirection direction = PointerAxisRelativeDirection::Normal);
     /**
      * @returns true if there is a pressed button with the given @p serial
      */
     bool hasImplicitPointerGrab(quint32 serial) const;
 
     /**
      * 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 method 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 wl_pointer.motion events (see {@link setPointerPos},
      * and can be sent in combination with such events, but also independently. There may
      * also be scenarios where wl_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.
      *
      * Sending relative pointer events only makes sense if the RelativePointerManagerInterface
      * is created on the Display.
      *
      * @param delta Motion vector
      * @param deltaNonAccelerated non-accelerated motion vector
      * @param microseconds timestamp with microseconds granularity
      * @see setPointerPos
      */
     void relativePointerMotion(const QPointF &delta, const QPointF &deltaNonAccelerated, std::chrono::microseconds timestamp);
 
     /**
      * Starts a multi-finger swipe gesture for the currently focused pointer surface.
      *
      * Such gestures are normally reported through dedicated input devices such as touchpads.
      *
      * 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.
      *
      * Only one gesture (either swipe or pinch or hold) can be active at a given time.
      *
      * @param fingerCount The number of fingers involved in this multi-finger touchpad gesture
      *
      * @see PointerGesturesInterface
      * @see focusedPointerSurface
      * @see updatePointerSwipeGesture
      * @see endPointerSwipeGesture
      * @see cancelPointerSwipeGesture
      * @see startPointerPinchGesture
      */
     void startPointerSwipeGesture(quint32 fingerCount);
 
     /**
      * The position of the logical center of the currently active multi-finger swipe gesture changes.
      *
      * @param delta coordinates are relative coordinates of the logical center of the gesture compared to the previous event.
      * @see startPointerSwipeGesture
      * @see endPointerSwipeGesture
      * @see cancelPointerSwipeGesture
      */
     void updatePointerSwipeGesture(const QPointF &delta);
 
     /**
      * The multi-finger swipe gesture ended. This may happen when one or more fingers are lifted.
      * @see startPointerSwipeGesture
      * @see updatePointerSwipeGesture
      * @see cancelPointerSwipeGesture
      * @see 5.29
      */
     void endPointerSwipeGesture();
 
     /**
      * The multi-finger swipe gestures ended and got cancelled by the Wayland compositor.
      * @see startPointerSwipeGesture
      * @see updatePointerSwipeGesture
      * @see endPointerSwipeGesture
      */
     void cancelPointerSwipeGesture();
 
     /**
      * Starts a multi-finch pinch gesture for the currently focused pointer surface.
      *
      * Such gestures are normally reported through dedicated input devices such as touchpads.
      *
      * 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.
      *
      * Only one gesture (either swipe or pinch or hold) can be active at a given time.
      *
      * @param fingerCount The number of fingers involved in this multi-touch touchpad gesture
      *
      * @see PointerGesturesInterface
      * @see focusedPointerSurface
      * @see updatePointerPinchGesture
      * @see endPointerPinchGesture
      * @see cancelPointerPinchGesture
      * @see startPointerSwipeGesture
      */
     void startPointerPinchGesture(quint32 fingerCount);
 
     /**
      * The position of the logical center, the rotation or the relative scale of this
      * multi-finger pinch gesture changes.
      *
      * @param delta coordinates are relative coordinates of the logical center of the gesture compared to the previous event.
      * @param scale an absolute scale compared to the gesture start
      * @param rotation relative angle in degrees clockwise compared to the previous start of update
      * @see startPointerPinchGesture
      * @see endPointerPinchGesture
      * @see cancelPointerPinchGesture
      */
     void updatePointerPinchGesture(const QPointF &delta, qreal scale, qreal rotation);
 
     /**
      *
      * @see startPointerPinchGesture
      * @see updatePointerPinchGesture
      * @see cancelPointerPinchGesture
      */
     void endPointerPinchGesture();
 
     /**
      *
      * @see startPointerPinchGesture
      * @see updatePointerPinchGesture
      * @see endPointerPinchGesture
      */
     void cancelPointerPinchGesture();
 
     /**
      * Starts a multi-finger hold gesture for the currently focused pointer surface.
      *
      * Such gestures are normally reported through dedicated input devices such as touchpads.
      *
      * The gesture is usually initiated by multiple fingers being held down on the touchpad.
      * The precise conditions of when such a gesture is detected are
      * implementation-dependent.
      *
      * Only one gesture (either swipe or pinch or hold) can be active at a given time.
      *
      * @param fingerCount The number of fingers involved in this multi-finger touchpad gesture
      *
      * @see PointerGesturesInterface
      * @see focusedPointerSurface
      * @see endPointerHoldeGesture
      * @see cancelPointerHoldGesture
      */
     void startPointerHoldGesture(quint32 fingerCount);
 
     /**
      * The multi-finger hold gesture ended. This may happen when one or more fingers are lifted.
      * @see startPointerHoldGesture
      * @see cancelPointerHoldGesture
      */
     void endPointerHoldGesture();
 
     /**
      * The multi-finger swipe gestures ended and got cancelled by the Wayland compositor.
      * @see startPointerHoldGesture
      * @see endPointerHoldGesture
      */
     void cancelPointerHoldGesture();
     ///@}
 
     /**
      * Passes keyboard focus to @p surface.
      *
      * If the SeatInterface has the keyboard capability, also the focused
      * text input surface will be set to @p surface.
      *
      * @see focusedKeyboardSurface
      * @see hasKeyboard
      * @see setFocusedTextInputSurface
      */
     void setFocusedKeyboardSurface(SurfaceInterface *surface);
     SurfaceInterface *focusedKeyboardSurface() const;
     KeyboardInterface *keyboard() const;
     void notifyKeyboardKey(quint32 keyCode, KeyboardKeyState state);
     void notifyKeyboardModifiers(quint32 depressed, quint32 latched, quint32 locked, quint32 group);
     ///@}
 
     /**
      * @name  touch related methods
      */
     ///@{
     void setFocusedTouchSurface(SurfaceInterface *surface, const QPointF &surfacePosition = QPointF());
     SurfaceInterface *focusedTouchSurface() const;
     TouchInterface *touch() const;
     void setFocusedTouchSurfacePosition(const QPointF &surfacePosition);
     QPointF focusedTouchSurfacePosition() const;
     void notifyTouchDown(qint32 id, const QPointF &globalPosition);
     void notifyTouchUp(qint32 id);
     void notifyTouchMotion(qint32 id, const QPointF &globalPosition);
     void notifyTouchFrame();
     void notifyTouchCancel();
     bool isTouchSequence() const;
     QPointF firstTouchPointPosition() const;
     /**
      * @returns true if there is a touch sequence going on associated with a touch
      * down of the given @p serial.
      */
     bool hasImplicitTouchGrab(quint32 serial) const;
     ///@}
 
     /**
      * @name Text input related methods.
      */
     ///@{
     /**
      * Passes text input focus to @p surface.
      *
      * If the SeatInterface has the keyboard capability this method will
      * be invoked automatically when setting the focused keyboard surface.
      *
      * In case there is a TextInputV2Interface for the @p surface, the enter
      * event will be triggered on the TextInputV2Interface for @p surface.
      * The focusedTextInput will be set to that TextInputV2Interface. If there
      * is no TextInputV2Interface for that @p surface, it might get updated later on.
      * In both cases the signal focusedTextInputChanged will be emitted.
      *
      * @see focusedTextInputSurface
      * @see focusedTextInput
      * @see focusedTextInputChanged
      * @see setFocusedKeyboardSurface
      */
     void setFocusedTextInputSurface(SurfaceInterface *surface);
     /**
      * @returns The SurfaceInterface which is currently focused for text input.
      * @see setFocusedTextInputSurface
      */
     SurfaceInterface *focusedTextInputSurface() const;
 
     TextInputV1Interface *textInputV1() const;
 
     /**
      * The currently focused text input, may be @c null even if there is a
      * focused text input surface set.
      *
      * The focused text input might not be enabled for the {@link focusedTextInputSurface}.
      * It is recommended to check the enabled state before interacting with the
      * TextInputV2Interface.
      *
      * @see focusedTextInputChanged
      * @see focusedTextInputSurface
      */
     TextInputV2Interface *textInputV2() const;
 
     TextInputV3Interface *textInputV3() const;
     ///@}
 
     /**
      * @returns The DataDeviceInterface holding the current clipboard selection.
      * @see selectionChanged
      * @see setSelection
      * This may be null
      */
     AbstractDataSource *selection() const;
 
     /**
      * This method allows to manually set the @p dataDevice for the current clipboard selection.
      * The clipboard selection is handled automatically in SeatInterface.
      * If a DataDeviceInterface belonging to the current focused KeyboardInterface
      * sets a selection, the current clipboard selection will be updated automatically.
      * With this method it's possible to override the automatic clipboard update for
      * e.g. the case of a clipboard manager.
      *
      * @param dataDevice Sets the current clipboard selection.
      * @see selection
      * @see selectionChanged
      */
     void setSelection(AbstractDataSource *selection);
 
     AbstractDataSource *primarySelection() const;
     void setPrimarySelection(AbstractDataSource *selection);
 
     void startDrag(AbstractDataSource *source, SurfaceInterface *sourceSurface, int dragSerial = -1, DragAndDropIcon *dragIcon = nullptr);
 
     /**
      * Returns the additional icon attached to the cursor during a drag-and-drop operation.
      * This function returns @c null if no drag-and-drop is active or no icon has been attached.
      */
     DragAndDropIcon *dragIcon() const;
 
     static SeatInterface *get(wl_resource *native);
 
 Q_SIGNALS:
     void nameChanged(const QString &);
     void hasPointerChanged(bool);
     void hasKeyboardChanged(bool);
     void hasTouchChanged(bool);
     void pointerPosChanged(const QPointF &pos);
     void touchMoved(qint32 id, quint32 serial, const QPointF &globalPosition);
     void timestampChanged();
 
     /**
      * Emitted whenever the selection changes
      * @see selection
      * @see setSelection
      */
     void selectionChanged(KWin::AbstractDataSource *);
 
     /**
      * Emitted whenever the primary selection changes
      * @see primarySelection
      */
     void primarySelectionChanged(KWin::AbstractDataSource *);
 
     /**
      * Emitted when a drag'n'drop operation is started
      * @see dragEnded
      */
     void dragStarted();
     /**
      * Emitted when a drag'n'drop operation ended, either by dropping or canceling.
      * @see dragStarted
      */
     void dragEnded();
     /**
      * Emitted whenever the drag surface for motion events changed.
      * @see dragSurface
      */
     void dragSurfaceChanged();
 
     /** Emitted when a drop ocurrs in a drag'n'drop operation. This is emitted
      * before dragEnded
      */
     void dragDropped();
     /**
      * Emitted whenever the focused text input changed.
      * @see focusedTextInput
      */
     void focusedTextInputSurfaceChanged();
     /**
      * Emitted whenever the focused keyboard is about to change.
      * @see focusedKeyboardSurface
      */
     void focusedKeyboardSurfaceAboutToChange(SurfaceInterface *nextSurface);
 
 private:
     std::unique_ptr<SeatInterfacePrivate> d;
     friend class SeatInterfacePrivate;
 };
 
 }
 
 Q_DECLARE_METATYPE(KWin::SeatInterface *)