XWayland keyboard grabbing
This protocol is application-specific to meet the needs of the X11 protocol through Xwayland. It provides a way for Xwayland to request all keyboard events to be forwarded to a surface even when the surface does not have keyboard focus.
In the X11 protocol, a client may request an "active grab" on the keyboard. On success, all key events are reported only to the grabbing X11 client. For details, see XGrabKeyboard(3).
The core Wayland protocol does not have a notion of an active keyboard grab. When running in Xwayland, X11 applications may acquire an active grab inside Xwayland but that cannot be translated to the Wayland compositor who may set the input focus to some other surface. In doing so, it breaks the X11 client assumption that all key events are reported to the grabbing client.
This protocol specifies a way for Xwayland to request all keyboard be directed to the given surface. The protocol does not guarantee that the compositor will honor this request and it does not prescribe user interfaces on how to handle the respond. For example, a compositor may inform the user that all key events are now forwarded to the given client surface, or it may ask the user for permission to do so.
Compositors are required to restrict access to this application specific protocol to Xwayland alone.
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.
A global interface used for grabbing the keyboard.
destroy()
Destroy the keyboard grab manager.
grab_keyboard(id: new_id<zwp_xwayland_keyboard_grab_v1>, surface: object<wl_surface>, seat: object<wl_seat>)
Argument | Type | Description |
|---|---|---|
| id | new_id<zwp_xwayland_keyboard_grab_v1> | |
| surface | object<wl_surface> | surface to report keyboard events to |
| seat | object<wl_seat> | the seat for which the keyboard should be grabbed |
The grab_keyboard request asks for a grab of the keyboard, forcing the keyboard focus for the given seat upon the given surface.
The protocol provides no guarantee that the grab is ever satisfied, and does not require the compositor to send an error if the grab cannot ever be satisfied. It is thus possible to request a keyboard grab that will never be effective.
The protocol:
- does not guarantee that the grab itself is applied for a surface, the grab request may be silently ignored by the compositor,
- does not guarantee that any events are sent to this client even if the grab is applied to a surface,
- does not guarantee that events sent to this client are exhaustive, a compositor may filter some events for its own consumption,
- does not guarantee that events sent to this client are continuous, a compositor may change and reroute keyboard events while the grab is nominally active.
zwp_xwayland_keyboard_grab_v1
A global interface used for grabbing the keyboard.
destroy()
Destroy the grabbed keyboard object. If applicable, the compositor will ungrab the keyboard.
Compositor Support
Copyright
Copyright © 2017 Red Hat Inc.
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