Package org.freedesktop.wayland.client

Interface WlDataDeviceEventsV2

All Superinterfaces:

WlDataDeviceEvents

All Known Subinterfaces:

WlDataDeviceEventsV3

public interface WlDataDeviceEventsV2
extends WlDataDeviceEvents

data transfer device

There is one wl_data_device per seat which can be obtained from the global wl_data_device_manager singleton.

A wl_data_device provides access to inter-client data transfer mechanisms such as copy-and-paste and drag-and-drop.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	VERSION

Method Summary

Modifier and Type	Method	Description
void	dataOffer(WlDataDeviceProxy emitter, WlDataOfferProxy id)	introduce a new wl_data_offer
void	drop(WlDataDeviceProxy emitter)	end drag-and-drop session successfully
void	enter(WlDataDeviceProxy emitter, int serial, WlSurfaceProxy surface, Fixed x, Fixed y, WlDataOfferProxy id)	initiate drag-and-drop session
void	leave(WlDataDeviceProxy emitter)	end drag-and-drop session
void	motion(WlDataDeviceProxy emitter, int time, Fixed x, Fixed y)	drag-and-drop session motion
void	selection(WlDataDeviceProxy emitter, WlDataOfferProxy id)	advertise new selection

Field Details

VERSION

static final int VERSION

See Also:

• Constant Field Values

Method Details

dataOffer

void dataOffer(WlDataDeviceProxy emitter,
 @Nonnull
 WlDataOfferProxy id)

introduce a new wl_data_offer

The data_offer event introduces a new wl_data_offer object, which will subsequently be used in either the data_device.enter event (for drag-and-drop) or the data_device.selection event (for selections). Immediately following the data_device.data_offer event, the new data_offer object will send out data_offer.offer events to describe the mime types it offers.

Specified by:

dataOffer in interface WlDataDeviceEvents

Parameters:

emitter - The protocol object that emitted the event.

id - the new data_offer object

enter

void enter(WlDataDeviceProxy emitter,
 int serial,
 @Nonnull
 WlSurfaceProxy surface,
 @Nonnull
 Fixed x,
 @Nonnull
 Fixed y,
 @Nullable
 WlDataOfferProxy id)

initiate drag-and-drop session

This event is sent when an active drag-and-drop pointer enters a surface owned by the client. The position of the pointer at enter time is provided by the x and y arguments, in surface-local coordinates.

Specified by:

enter in interface WlDataDeviceEvents

Parameters:

emitter - The protocol object that emitted the event.

serial - serial number of the enter event

surface - client surface entered

x - surface-local x coordinate

y - surface-local y coordinate

id - source data_offer object

leave

void leave(WlDataDeviceProxy emitter)

end drag-and-drop session

This event is sent when the drag-and-drop pointer leaves the surface and the session ends. The client must destroy the wl_data_offer introduced at enter time at this point.

Specified by:

leave in interface WlDataDeviceEvents

Parameters:

emitter - The protocol object that emitted the event.

motion

void motion(WlDataDeviceProxy emitter,
 int time,
 @Nonnull
 Fixed x,
 @Nonnull
 Fixed y)

drag-and-drop session motion

This event is sent when the drag-and-drop pointer moves within the currently focused surface. The new position of the pointer is provided by the x and y arguments, in surface-local coordinates.

Specified by:

motion in interface WlDataDeviceEvents

Parameters:

emitter - The protocol object that emitted the event.

time - timestamp with millisecond granularity

x - surface-local x coordinate

y - surface-local y coordinate

drop

void drop(WlDataDeviceProxy emitter)

end drag-and-drop session successfully

The event is sent when a drag-and-drop operation is ended because the implicit grab is removed.

The drag-and-drop destination is expected to honor the last action received through wl_data_offer.action, if the resulting action is "copy" or "move", the destination can still perform wl_data_offer.receive requests, and is expected to end all transfers with a wl_data_offer.finish request.

If the resulting action is "ask", the action will not be considered final. The drag-and-drop destination is expected to perform one last wl_data_offer.set_actions request, or wl_data_offer.destroy in order to cancel the operation.

Specified by:

drop in interface WlDataDeviceEvents

Parameters:

emitter - The protocol object that emitted the event.

selection

void selection(WlDataDeviceProxy emitter,
 @Nullable
 WlDataOfferProxy id)

advertise new selection

The selection event is sent out to notify the client of a new wl_data_offer for the selection for this device. The data_device.data_offer and the data_offer.offer events are sent out immediately before this event to introduce the data offer object. The selection event is sent to a client immediately before receiving keyboard focus and when a new selection is set while the client has keyboard focus. The data_offer is valid until a new data_offer or NULL is received or until the client loses keyboard focus. Switching surface with keyboard focus within the same client doesn't mean a new selection will be sent. The client must destroy the previous selection data_offer, if any, upon receiving this event.

Specified by:

selection in interface WlDataDeviceEvents

Parameters:

emitter - The protocol object that emitted the event.

id - selection data_offer object