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XGrabKeyboard(3) XLIB FUNCTIONS XGrabKeyboard(3)
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
The XGrabKeyboard function actively grabs control of the keyboard and generates FocusIn
and FocusOut events. Further key events are reported only to the grabbing client.
XGrabKeyboard overrides any active keyboard grab by this client. If owner_events is
False, all generated key events are reported with respect to grab_window. If owner_events
is True and if a generated key event would normally be reported to this client, it is
reported normally; otherwise, the event is reported with respect to the grab_window. Both
KeyPress and KeyRelease events are always reported, independent of any event selection
made by the client.
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 key-
board (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 key-
board 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 cur-
rent 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
XAllowEvents(3), XGrabButton(3), XGrabKey(3), XGrabPointer(3)
Xlib - C Language X Interface
X Version 11 libX11 1.6.7 XGrabKeyboard(3)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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