wlr data control

Control data devices

This protocol allows a privileged client to control data devices. In particular, the client will be able to manage the current selection and take the role of a clipboard manager.

Warning! The protocol described in this file is experimental and backward incompatible changes may be made. Backward compatible changes may be added together with the corresponding interface version bump. Backward incompatible changes are done by bumping the version number in the protocol and interface names and resetting the interface version. Once the protocol is to be declared stable, the 'z' prefix and the version number in the protocol and interface names are removed and the interface version number is reset.

Manager to control data devices

This interface is a manager that allows creating per-seat data device controls.

create_data_source(id: new_id<zwlr_data_control_source_v1>)
Argument
Type
Description
idnew_id<zwlr_data_control_source_v1>
data source to create
Create a new data source

Create a new data source.

get_data_device(id: new_id<zwlr_data_control_device_v1>, seat: object<wl_seat>)
Argument
Type
Description
idnew_id<zwlr_data_control_device_v1>
seatobject<wl_seat>
Get a data device for a seat

Create a data device that can be used to manage a seat's selection.

destroy()
Destroy the manager

All objects created by the manager will still remain valid, until their appropriate destroy request has been called.


Manage a data device for a seat

This interface allows a client to manage a seat's selection.

When the seat is destroyed, this object becomes inert.

set_selection(source: object<zwlr_data_control_source_v1>)
Argument
Type
Description
sourceobject<zwlr_data_control_source_v1>allow null
Copy data to the selection

This request asks the compositor to set the selection to the data from the source on behalf of the client.

The given source may not be used in any further set_selection or set_primary_selection requests. Attempting to use a previously used source is a protocol error.

To unset the selection, set the source to NULL.

destroy()
Destroy this data device

Destroys the data device object.

set_primary_selection(source: object<zwlr_data_control_source_v1>)
Argument
Type
Description
sourceobject<zwlr_data_control_source_v1>allow null
Copy data to the primary selection

This request asks the compositor to set the primary selection to the data from the source on behalf of the client.

The given source may not be used in any further set_selection or set_primary_selection requests. Attempting to use a previously used source is a protocol error.

To unset the primary selection, set the source to NULL.

The compositor will ignore this request if it does not support primary selection.

data_offer(id: new_id<zwlr_data_control_offer_v1>)
Argument
Type
Description
idnew_id<zwlr_data_control_offer_v1>
Introduce a new wlr_data_control_offer

The data_offer event introduces a new wlr_data_control_offer object, which will subsequently be used in either the wlr_data_control_device.selection event (for the regular clipboard selections) or the wlr_data_control_device.primary_selection event (for the primary clipboard selections). Immediately following the wlr_data_control_device.data_offer event, the new data_offer object will send out wlr_data_control_offer.offer events to describe the MIME types it offers.

selection(id: object<zwlr_data_control_offer_v1>)
Argument
Type
Description
idobject<zwlr_data_control_offer_v1>allow null
Advertise new selection

The selection event is sent out to notify the client of a new wlr_data_control_offer for the selection for this device. The wlr_data_control_device.data_offer and the wlr_data_control_offer.offer events are sent out immediately before this event to introduce the data offer object. The selection event is sent to a client when a new selection is set. The wlr_data_control_offer is valid until a new wlr_data_control_offer or NULL is received. The client must destroy the previous selection wlr_data_control_offer, if any, upon receiving this event.

The first selection event is sent upon binding the wlr_data_control_device object.

finished()
This data control is no longer valid

This data control object is no longer valid and should be destroyed by the client.

primary_selection(id: object<zwlr_data_control_offer_v1>)
Argument
Type
Description
idobject<zwlr_data_control_offer_v1>allow null
Advertise new primary selection

The primary_selection event is sent out to notify the client of a new wlr_data_control_offer for the primary selection for this device. The wlr_data_control_device.data_offer and the wlr_data_control_offer.offer events are sent out immediately before this event to introduce the data offer object. The primary_selection event is sent to a client when a new primary selection is set. The wlr_data_control_offer is valid until a new wlr_data_control_offer or NULL is received. The client must destroy the previous primary selection wlr_data_control_offer, if any, upon receiving this event.

If the compositor supports primary selection, the first primary_selection event is sent upon binding the wlr_data_control_device object.

error { used_source } 
Argument
Value
Description
used_source1
source given to set_selection or set_primary_selection was already used before

Offer to transfer data

The wlr_data_control_source object is the source side of a wlr_data_control_offer. It is created by the source client in a data transfer and provides a way to describe the offered data and a way to respond to requests to transfer the data.

offer(mime_type: string)
Argument
Type
Description
mime_typestring
MIME type offered by the data source
Add an offered MIME type

This request adds a MIME type to the set of MIME types advertised to targets. Can be called several times to offer multiple types.

Calling this after wlr_data_control_device.set_selection is a protocol error.

destroy()
Destroy this source

Destroys the data source object.

send(mime_type: string, fd: fd)
Argument
Type
Description
mime_typestring
MIME type for the data
fdfd
file descriptor for the data
Send the data

Request for data from the client. Send the data as the specified MIME type over the passed file descriptor, then close it.

cancelled()
Selection was cancelled

This data source is no longer valid. The data source has been replaced by another data source.

The client should clean up and destroy this data source.

error { invalid_offer } 
Argument
Value
Description
invalid_offer1
offer sent after wlr_data_control_device.set_selection

Offer to transfer data

A wlr_data_control_offer represents a piece of data offered for transfer by another client (the source client). The offer describes the different MIME types that the data can be converted to and provides the mechanism for transferring the data directly from the source client.

receive(mime_type: string, fd: fd)
Argument
Type
Description
mime_typestring
MIME type desired by receiver
fdfd
file descriptor for data transfer
Request that the data is transferred

To transfer the offered data, the client issues this request and indicates the MIME type it wants to receive. The transfer happens through the passed file descriptor (typically created with the pipe system call). The source client writes the data in the MIME type representation requested and then closes the file descriptor.

The receiving client reads from the read end of the pipe until EOF and then closes its end, at which point the transfer is complete.

This request may happen multiple times for different MIME types.

destroy()
Destroy this offer

Destroys the data offer object.

offer(mime_type: string)
Argument
Type
Description
mime_typestring
offered MIME type
Advertise offered MIME type

Sent immediately after creating the wlr_data_control_offer object. One event per offered MIME type.


Copyright © 2018 Simon Ser Copyright © 2019 Ivan Molodetskikh

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