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NAME

XGrabKeyboard, XUngrabKeyboard - grab the keyboard
 

SYNTAX

int XGrabKeyboard(Display *display, Window grab_window, Bool owner_events, int pointer_mode, int keyboard_mode, Time time);

int XUngrabKeyboard(Display *display, Time time);

ARGUMENTS

display

Specifies the connection to the X server.

grab_window

Specifies the grab window.

keyboard_mode

Specifies further processing of keyboard events. You can pass GrabModeSync or GrabModeAsync.

owner_events

Specifies a Boolean value that indicates whether the keyboard events are to be reported as usual.

pointer_mode

Specifies further processing of pointer events. You can pass GrabModeSync or GrabModeAsync.

time

Specifies the time. You can pass either a timestamp or CurrentTime.

DESCRIPTION

If the keyboard_mode argument is GrabModeAsync, keyboard event processing continues as usual. If the keyboard is currently frozen by this client, then processing of keyboard events is resumed. If the keyboard_mode argument is GrabModeSync, the state of the keyboard (as seen by client applications) appears to freeze, and the X server generates no further keyboard events until the grabbing client issues a releasing XAllowEvents call or until the keyboard grab is released. Actual keyboard changes are not lost while the keyboard is frozen; they are simply queued in the server for later processing.

If pointer_mode is GrabModeAsync, pointer event processing is unaffected by activation of the grab. If pointer_mode is GrabModeSync, the state of the pointer (as seen by client applications) appears to freeze, and the X server generates no further pointer events until the grabbing client issues a releasing XAllowEvents call or until the keyboard grab is released. Actual pointer changes are not lost while the pointer is frozen; they are simply queued in the server for later processing.

If the keyboard is actively grabbed by some other client, XGrabKeyboard fails and returns AlreadyGrabbed. If grab_window is not viewable, it fails and returns GrabNotViewable. If the keyboard is frozen by an active grab of another client, it fails and returns GrabFrozen. If the specified time is earlier than the last-keyboard-grab time or later than the current X server time, it fails and returns GrabInvalidTime. Otherwise, the last-keyboard-grab time is set to the specified time (CurrentTime is replaced by the current X server time).

XGrabKeyboard can generate BadValue and BadWindow errors.

The XUngrabKeyboard function releases the keyboard and any queued events if this client has it actively grabbed from either XGrabKeyboard or XGrabKey. XUngrabKeyboard does not release the keyboard and any queued events if the specified time is earlier than the last-keyboard-grab time or is later than the current X server time. It also generates FocusIn and FocusOut events. The X server automatically performs an UngrabKeyboard request if the event window for an active keyboard grab becomes not viewable.  

DIAGNOSTICS

BadValue

Some numeric value falls outside the range of values accepted by the request. Unless a specific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error.

BadWindow

A value for a Window argument does not name a defined Window.

SEE ALSO

Index

NAME

SYNTAX

ARGUMENTS

DESCRIPTION

DIAGNOSTICS

SEE ALSO

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