ei_keyboard
Keyboard Object
Interface for keyboard requests and events. This interface
is available on devices with the ei_device.capability keyboard.
This interface is only provided once per device and where a client
requests ei_keyboard.release the interface does not get re-initialized. An
EIS implementation may adjust the behavior of the device (including removing
the device) if the interface is releasd.
Note that for a client to receive objects of this type, it must announce
support for this interface in ei_handshake.interface_version.
Enums
Enum names are shown here in uppercase. The exact name depends on the language bindings.
ei_keyboard.key_state
The logical state of a key.
| Name | Value | Summary |
|---|---|---|
RELEASED |
0 | the key is logically up |
PRESS |
1 | the key is logically down |
ei_keyboard.keymap_type
The keymap type describes how the keymap in the ei_keyboard.keymap event
should be parsed.
| Name | Value | Summary |
|---|---|---|
XKB |
1 | a libxkbcommon-compatible XKB keymap |
Requests
ei_keyboard.release
Since Version1 Request Opcode0
ei_keyboard.release()Notification that the client is no longer interested in this keyboard.
The EIS implementation will release any resources related to this keyboard and
send the ei_keyboard.destroyed event once complete.
ei_keyboard.key
Since Version1 Request Opcode1
ei_keyboard.key(key, state)| Argument | Type | Summary |
|---|---|---|
| key | uint32 |
the key code |
| state | uint32 |
logical state of the key |
This request is only available for clients of ei_handshake.context_type.sender.
Generate a key event on this keyboard. If the device has an
ei_keyboard.keymap, the key code corresponds to that keymap.
The key codes must match the defines in linux/input-event-codes.h.
It is a client bug to send more than one key request for the same key
within the same ei_device.frame.
It is a protocol violation to send this request for a client
of an ei_handshake.context_type other than sender.
Events
ei_keyboard.destroyed
Since Version1 Event Opcode0
ei_keyboard.destroyed(serial)| Argument | Type | Summary |
|---|---|---|
| serial | uint32 |
this event’s serial number |
Immediately after sending this request, the object is considered destroyed by the EIS implementation. It must no longer be used by the client.
This keyboard has been removed and a client should release all associated resources.
This ei_keyboard object will be destroyed by the EIS implementation immmediately after
after this event is sent and as such the client must not attempt to use
it after that point.
ei_keyboard.keymap
Since Version1 Event Opcode1
ei_keyboard.keymap(keymap_type, size, keymap)| Argument | Type | Summary |
|---|---|---|
| keymap_type | uint32 |
the keymap type |
| size | uint32 |
the keymap size in bytes |
| keymap | fd |
file descriptor to the keymap |
Notification that this device has a keymap. Future key events must be
interpreted by the client according to this keymap. For clients
of ei_handshake.context_type sender it is the client’s
responsibility to send the correct ei_keyboard.key keycodes to
generate the expected keysym in the EIS implementation.
The keymap is constant for the lifetime of the device.
This event provides a file descriptor to the client which can be memory-mapped in read-only mode to provide a keyboard mapping description. The fd must be mapped with MAP_PRIVATE by the recipient, as MAP_SHARED may fail.
This event is sent immediately after the ei_keyboard object is created
and before the ei_device.done event. It is a protocol violation to send this
event after the ei_device.done event.
ei_keyboard.key
Since Version1 Event Opcode2
ei_keyboard.key(key, state)| Argument | Type | Summary |
|---|---|---|
| key | uint32 |
|
| state | uint32 |
This event is only available for clients of ei_handshake.context_type.receiver.
See the ei_keyboard.key request for details.
It is a protocol violation to send this request for a client
of an ei_handshake.context_type other than receiver.
It is a protocol violation to send a key down event in the same frame as a key up event for the same key in the same frame.
ei_keyboard.modifiers
Since Version1 Event Opcode3
ei_keyboard.modifiers(serial, depressed, locked, latched, group)| Argument | Type | Summary |
|---|---|---|
| serial | uint32 |
this event’s serial number |
| depressed | uint32 |
depressed modifiers |
| locked | uint32 |
locked modifiers |
| latched | uint32 |
latched modifiers |
| group | uint32 |
the keyboard group (layout) |
Notification that the EIS implementation has changed modifier
states on this device. Future ei_keyboard.key requests must take the
new modifier state into account.
A client must assume that all modifiers are lifted when it
receives an ei_device.paused event. The EIS implementation
must send this event after ei_device.resumed to notify the client
of any nonzero modifier state.
This event does not reqire an ei_device.frame and should
be processed immediately by the client.
This event is only sent for devices with an ei_keyboard.keymap.